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HomeMy WebLinkAboutMisc 2DRAFT Engineering Design Report Seahawks Headquarters and Practice Facility -North and South Baxter Properties Renton, Washington Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite 207 Seattle, Washington 98134 RETEC Project Number: VULC1-19589-510 Prepared for: Football Northwest LLC 505 Fifth Avenue South Seattle, Washington 98104 October 2006 I. : r.· i I 'I ' ' ' __ ·~ \.. l • October 10, 2006 Ms. Sunny Llnhao Becker, P.E. Department of Ecology NWRO 3190 160"' Avenue SE Bellevue, WA 98008 The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite 207 Seattle, WA98134-1162 ~1\,,RETEC (206) 624-9349 Phone (206) 624-2839 Fax www.retec.com RE: Tranmiittal of Draft EDR-Seahawks Headquarters and Training Focility North and South Baxter Properties -Renton, WA Dear Ms. Becker: Enclosed please find three (3) copies of the Draft Engineering Design Report (EDR) for the remaining cleanup work pursuant to the Consent Decrees at the Baxter North and South Properties in Renton, Washington. The identified remediation work will be performed as the initial steps of the Seahawks Headquarters and Training Facility development planned for the properties_ We believe that it may be advantageous to have a technical meeting in the next week or two with you (including others from Ecology as you deem necessary) and WDFW to preview portions of the document and discuss any initial observations that you may have. No attorneys need to attend this meeting_ We would also like to discuss coordination with the City of Renton as your work proceeds. We hope that this Draft EDR provides sufficient detail for all reviewers and that we will be able to obtain conditional approval from Ecology to commence site work by mid-November. We appreciate your attendance at previous meetings to discuss the project and your continued coordination with the City of Renton and the Washington Department of Fish and Wildlife (WDFW) to address substantive requirement and permitting issues. Please feel free to call or e-mail me regarding any comment or questions you have regarding this document. • Ms. Sunny Linhao Becker October 10, 2006 Page 2 Sincerely, The RETEC Group, Inc. Grant Hainsworth, P.E. Project Manager cc: RETECProjectNo. VULCI-19589 Stewart Reinbold -WDFW (via Ecology) Melissa Rourke -Attorney General Elizabeth Higgins -City of Renton (via Vulcan) Elaine Wine -Vulcan Lance Lopes -Football NW Chuck Wolfe -CR Wolfe Law Andy Kindig-AC Kindig David Murphy-Crawford Steven Haluschak -MKA Eric Gold -DA Hogan Dan Suver -Bayley Construction DRAFT Engineering Design Report Seahawks Headquarters and Practice Facility-North and South Baxter Properties Renton, Washington Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite 207 Seattle, Washington 98134 RETEC Project Number: VULC1-19589-510 Prepared for: Football Northwest LLC 505 Fifth Avenue South Seattle, Washington 98104 October 2006 DRAFT Engineering Design Report Seahawks Headquarters and Practice Facility -North and South Baxter Properties Renton, Washington Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite 207 Seattle, Washington 98134 RETEC Project Number: VULC1-19589-510 Prepared for: Football Northwest LLC 505 Fifth Avenue South Seattle, Washington 98104 ~(!) ~-; ·;. Prepared by: .. ( .,·, . ., ,, ,> .;~··--.. ~:.: October 2006 F:\PROJECTW\Seahawks\EDR\Seahawks EDR_Fina1Draft.doc Professional Certification Engineering Design Report Seahawks Headquarters and Practice Facility - North and South Baxter Properties Renton, Washington RETEC Project Number: VULC1-19589-510 October 2006 This report has been prepared by the staff of The RETEC Group, Inc., under the professional supervision of the person whose seal and signature appear hereon. sworth, P.E. Regis red Professional Engineer Washington State #33192 Table of Contents I Introduction .................................................................................................... 1-1 1.1 Site History ........................................................................................ 1-2 1.2 Background ........................................................................................ 1-3 1.3 Purpose ............................................................................................... 1-3 1.4 Overview of Cleanup Actions ............................................................ 1-3 1.4.1 South Baxter Property ............................................................ 1-4 1.4.2 North Baxter Property ............................................................ 1-5 2 Regulatory Framework .................................................................................. 2-1 2.1 Model Toxics Control Act Design Requirements .............................. 2-1 2.2 Other Regulatory Requirements ........................................................ 2-1 2.2 .1 Health and Safety ................................................................... 2-1 2.2.2 Stormwater Management ....................................................... 2-1 2.2.3 Shoreline Master Use Permit ................................................. 2-2 2.2.4 Fugitive Dust Emissions ........................................................ 2-2 2.2.5 Noise Control ......................................................................... 2-2 2.2.6 Grading and Filling ................................................................ 2-2 2.2.7 Solid Waste Management ...................................................... 2-3 2.2.8 Working in Utility Easement ................................................. 2-3 2.2.9 Gypsy Subbasin Drainage Abandonment, Replacement, and Capping ....................................................................................... 2-3 2.2.10 King County/METRO Discharge Permit ............................... 2-3 3 Design Criteria ............................................................................................... 3-1 3.1 Wetland Mitigation ............................................................................ 3-1 3.2 WoodWasteArea .............................................................................. 3-I 3.3 Building Foundation Spoils ............................................................... 3-1 3.4 Site Development Cut and Fill ........................................................... 3-2 3.5 Import Fill .......................................................................................... 3-2 3.6 Stormwater Management ................................................................... 3-3 3 .6.1 Synthetic Turf Field and Building Roof Areas ...................... 3-3 3 .6.2 Natural TurfFields ................................................................. 3-3 3.6.3 Paved Parking and Driveways ............................................... 3-3 3.7 Environmental Cap ............................................................................ 3-4 3.8 Gypsy Subbasin Drainage Abandonment, Replacement and Capping .......................................................................................................... 3-8 4 ScopeofWork ............................................................................................... 4-1 4.1 Construction Drawings ...................................................................... 4-1 4.2 Mobilization and Site Preparation ..................................................... 4-1 4.3 Spoils from Building Foundation ....................................................... 4-2 4.4 Site Development Cut and Fill ........................................................... 4-3 4.5 Site Development Grading ................................................................. 4-3 4.6 Import Fill Testing ............................................................................. 4-3 4.7 Environmental Cap Construction ....................................................... 4-4 VULCJ-19589-510 Table of Contents 4.8 Gypsy Subbasin Drainage Abandonment, Replacement and Capping .......................................................................................................... 4-5 5 Construction Quality Assurance .................................................................... 5-1 5.1 Quality Assurance Monitoring Structure ........................................... 5-1 5.2 Construction Quality Requirements ................................................... 5-1 5 .2.1 Health and Safety ................................................................... 5-1 5.2.2 Performance Standards .......................................................... 5-2 5.2.3 Record Keeping and Reporting .............................................. 5-4 6 Long-Term Monitoring .................................................................................. 6-1 6.1 Compliance Groundwater Monitoring ............................................... 6-1 6.2 Cap Inspection and Maintenance Form ............................................. 6-2 6.2.1 Cap Inspection and Maintenance Plan ................................... 6-2 6.2.2 Cap Inspection and Maintenance Requirements .................... 6-2 6.2.3 Cap Maintenance ................................................................... 6-3 6.2.4 Asphalt Pavement, Artificial Turf Field, and Concrete Slab Cap Maintenance ....................................................................... 6-4 6.2.5 Natural Turf Field, Membrane Cap and Landscaping Cap Maintenance ....................................................................................... 6-5 6.2.6 Documentation and Reporting ............................................... 6-5 6.2. 7 Inspection and Maintenance Summary .................................. 6-5 6.3 Soil Management Plan ....................................................................... 6-6 7 References ...................................................................................................... 7-1 VULCJ-19589-510 ii List of Tables Table 5-1 Performance Standards for Remedial Activities during Redevelopment ........................................................................................ 5-6 Table 6-1 Cap Conditions ......................................................................................... 6-7 Table 6-2 Summary of Inspection and Maintenance Requirements ........................ 6-8 List of Figures Figure 1-1 Site Map ................................................................................................ 1-6 Figure 2-1 Utility Location Map ........................................................................ , .... 2-4 Figure 3-1 Wood Waste Area Test Pit Location .................................................... 3-9 Figure 3-2 Cap Location ....................................................................................... 3-10 Figure 3-3 Field Cap Section ................................................................................ 3-11 Figure 3-4 Asphalt Pavement Cap Section ........................................................... 3-12 Figure 3-5 Concrete Slab Cap Section .................................................................. 3-13 Figure 3-6 Landscape Cap Section ....................................................................... 3-14 Figure 3-7 Membrane Cap Section ............ : .......................................................... 3-15 Figure 4-1 EDR and Construction Schedule .......................................................... 4-6 Figure 4-2 Sections and Details .............................................................................. 4-7 Figure 4-3 Temporary Erosion and Sedimentation Control Plan ........................... 4-8 Figure 4-4 Site Demolition Plan ............................................................................. 4-9 Figure 4-5 Wells to be Decommissioned .............................................................. 4-10 Figure 4-6 Building Foundation Location ............................................................ 4-11 Figure 4-7 Site Cut and Fill Contours ................................................................... 4-12 Figure 4-8 Early Grading Plan .............................................................................. 4-13 Figure 4-9 Utility Trench Construction Details .................................................... 4-14 Figure 4-10 Gypsy Subbasin Storm Drain Relocation Plan ................................... 4-15 Figure 4-11 Figure 5-1 Figure 6-1 Gypsy Subbasin Storm Drain Relocation Profile ............................... 4-16 Quality Control Organization Chart .................................................... 5-1 O I&M Plan Area ...................................................................................... 6-9 Figure 6-2 Sample Cap Inspection Log ................................................................ 6-1 O VULCJ-19589-510 iii List of Appendices Appendix A Consent Decrees Appendix B Partial Certificate of Completion Appendix C Stormwater Pollution Prevention Plan Appendix D City of Renton Substantive Requirement Letter Appendix E Wetland Documents Appendix F Stormwater Technical Information Appendix G Integrated Pesticide Management Plan Appendix H Gypsy Hydraulic Project Approval Submittal Appendix I City of Renton Early Site Package Drawings Appendix J Soil Management Plan VULC/-19589-5/0 iv 1 Introduction This document presents the Engineering Design Report (EDR) for the J.H. Baxter Company (Baxter) North Property, and an Addendum to the EDR for the Baxter South Property ("Sites") in Renton, Washington. The EDR was prepared by The RETEC Group, Inc. for Football Northwest LLC (Football NW). The properties are currently owned by Port Quendall Company (PQC). The EDR is one in a series of documents required under the Model Toxics Control Act (MTCA; RCW 70.105D; WAC 173-340) cleanup process. Several documents required under MTCA have already been completed during this cleanup process: the Draft Remedial Investigation (RI; Woodward- Clyde, 1990) and the Feasibility Stud{ies] (FS) (ThermoRetec Consulting Corporation [ThermoRetec], 2000a and ThermoRetec, 2000c) presented the results of investigations of the nature and extent of contamination at the sites. The FS (ThermoRetec, 2000a and ThermoRetec, 2000c) further evaluated the extent of impacts and the feasibility of remedial alternatives for the sites. The Cleanup Action Plan[s] (CAP) (ThermoRetec, 2000b and ThermoRetec, 2000c) describes the cleanup action for the sites. The Engineering Design Report (RETEC, 2002) was completed for the South Baxter Property to document the engineering concepts and design criteria used for the design of the cleanup action and associated mitigation and enhancement in the South Baxter CAP (ThermoRetec, 2000b). The Construction Completion Report (RETEC, 2005) documented completion of previous remedial actions for the South Baxter Property. The North and South Baxter Properties were determined to be separate facilities based on historical operations, previous studies, and previous correspondence and agreements between J. H. Baxter and Washington Department of Ecology (Ecology), which defined a "Line of Demarcation" between the two Properties. The line of Demarcation was originally defined in the Renton-Baxter Remediation Security Interest Agreement dated May 6, 1992 and subsequent Ecology correspondence. In 2000, the City of Renton approved a Jot line adjustment application to formally segregate the North and South Baxter Properties. Ecology and PQC negotiated separate Prospective Purchaser Consent Decrees (CD) (Appendix A) for the North Baxter Property and South Baxter Property, which were entered in King County Superior Court on May 18, 2000. The CDs require implementation of a cleanup action, restrictive covenants, and associated restoration and enhancement at each site. Form Restrictive Covenants are also included in Appendix A. Restrictive Covenants for the sites will be executed once cleanup actions have been completed. The purpose of the Restrictive Covenants is to ensure that any activities that occur at the sites following implementation of the cleanup action, such as excavation beneath the environmental cap to install a new utility line, will occur in a VULCl-19589-510 1-1 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington manner that is protective of human health and the environment, will include appropriate management of contaminated soil, and will replace the environmental cap. In 2002 and 2004, PQC completed remediation work on the South Baxter Property to satisfy capital portions of the South Baxter CD. The capital portions that were completed include source remediation (DNAPL removal, soil excavation and disposal, and in situ stabilization) and wetland mitigation. This remediation work is documented in the Ecology-approved Construction Completion Report (RETEC, 2005). A Partial Certificate of Completion for the Capital Portion of work completed at the site was issued by Ecology on April 10, 2006 (Appendix B). The CAPs for the South Baxter Property and North Baxter Property also require placement of an environmental cap over most of the site area and associated institutional controls. As discussed in the initial South Baxter Property EDR (RETEC, 2002), the environmental cap and institutional controls were to be implemented at a later date once future redevelopment plans for at the sites were finalized. As part of development activities for the sites, Football NW will be redeveloping the North and South Baxter properties for use as the Seattle Seahawks Headquarters and Training facility located in Renton, Washington. As a result, the remaining cleanup activities ( capping and institutional controls) are required to be addressed in accordance with the Consent Decrees and consistent with the April 10, 2006 Partial Certificate of Completion. This EDR addresses these remaining cleanup activities for this site. 1.1 Site History The PQC currently owns the North and South Baxter properties (Figure 1-1 ). The North Baxter Property, known as the North J. H. Baxter Property/Renton ("North Baxter Property"), is located at 5015 Lake Washington Boulevard North on the eastern shore of Lake Washington in the northeastern portion of the City of Renton, in King County, Washington. The North Baxter Property occupies approximately 12 acres, three miles south of the junction of Interstate Highways 405 and 90. The North Baxter Property is relatively flat and is situated within the northern portion of a roughly 70-acre alluvial plain bordering the Lake Washington shoreline. The Misty Cove Condominiums are located directly to the north of the Property. The South Baxter Property is located directly to the south of the North Baxter Property. The South Baxter Property occupies approximately 7 acres. The South Baxter Property is relatively flat and is bound by the mitigation wetland and Lake Washington to the west. The Quendall Terminals Property is located directly to the south of the Property. Further to the south is the property VULCJ-19589-510 1-2 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington currently occupied by Barbee Mill. futerstate 405 is located approximately 500 feet to the east. An existing BNSF Railway Company railroad line is still partially active serving a tourist dinner train and freight deliveries on a periodic basis. The maximum number of trips per day is four or less. Direct access to the sites is currently provided via two at grade crossings. 1.2 Background The Baxter properties were essentially undeveloped until the mid-l 950s, when a wood treating facility was constructed on site. All property histories indicate that both creosote and pentachlorophenol (PCP) treating solutions were used at the site until wood-treating operations ceased in 1981. Creosote was used to treat railroad ties and pilings, and PCP solutions were used to treat utility poles. Wood was treated and stored on the Baxter South Property and was distributed to purchasers by rail or truck. Historically, the North Baxter Property was used as a storage facility for untreated wood and a de-barker was operated. Former drip tracks were reportedly present on the North Property. Based upon historical usage of chemicals at the sites as well as analytical data available from site investigation activities described in the FS, the compounds of concern at the Baxter South Property are PCP and polycyclic aromatic hydrocarbons (P AHs ). These compounds are known to exist in soil at the North Baxter Property and in both soil and groundwater at the South Baxter Property. The most significant soil, sediment, and groundwater impacts were addressed during cleanup actions on the South Baxter Property in 2002 and 2004. 1.3 Purpose The purpose of this EDR is to document the engineering concepts and design criteria used for the design of the enviromnental cap that will complete enviromnental cleanup actions specified in the South Baxter Property CAP (ThermoRetec, 2000b) and North Baxter Property CAP (ThermoRetec, 2000c) and referenced in the Partial Certificate of Completion dated April 10, 2006. This EDR satisfies the requirements of WAC 173-340-400 (a) through (c) and has been prepared under the direct supervision of a registered Professional Engineer. 1.4 Overview of Cleanup Actions This section provides an overview of the approved cleanup action remedies for the South Baxter Property and North Baxter Property. VULCJ-19589-510 1-3 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington 1.4.1 South Baxter Property The cleanup action, as described in the South Baxter CAP (ThermoRetec, 2000b) is comprised of the following activities: 1) Removal and off-site disposal of impacted sediment above the action level of 100 mg/kg total P AH from Baxter Cove 2) Re-creation of wetlands adjacent to Lake Washington and buffer restoration and enhancement; impact avoidance to species listed as threatened under the Endangered Species Act through hydraulic isolation of the project work and the timing of in-water work 3) Dense non-aqueous phase liquid removal (DNAPL) from source monitoring well BAX-14 4) Excavation oflight non-aqueous phase liquid (LNAPL) impacted soil in the tank farm area based on an action level of 1,000 mg/kg total P AH and off-site disposal of soil to remove long-term source of groundwater impacts 5) Excavation and off-site disposal of KOO I listed hazardous waste from Baxter Lagoon area 6) In situ stabilization (ISS) of impacted soil near the Butt Tank and Baxter Lagoon area based on an action level of 1,000 mg/kg total P AH to remove long term source of groundwater impacts 7) Capping of residual soil impacts during development to prevent direct contact by humans and engineering controls, including cap inspection and maintenance program, to ensure cap integrity into the future; monitoring of groundwater and implementation of a compliance monitoring program to ensure that groundwater discharging to Lake Washington is protective 8) Implementation of institutional controls to prevent future groundwater extraction and to ensure that any future breaching of the environmental cap is performed in accordance with the Restrictive Covenant and the Soil Management Plan. Components I thru 6 have been completed and described in detail in the Ecology-approved Construction Completion Report (RETEC, 2005) and approved by the April 10, 2006 Partial Certificate of Completion. Components 7 and 8 will be addressed in Sections 3 and 4 of this report. VULCJ-19589-510 1-4 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington 1.4.2 North Baxter Property The cleanup action, as described in the North Baxter CAP (ThermoRetec, 2000c) is comprised of the following activities: I) Capping of residual soil impacts during development to prevent direct contact by humans and habitat 2) Provide engineering controls, including cap inspection and maintenance program, to ensure cap integrity into the future 3) Implementation of institutional controls to prevent future groundwater extraction and to ensure that any future breaching of the environmental cap is performed in accordance with the Restrictive Covenant. As part of the North Baxter Property cleanup action, fill of an approximately I 25-foot section of Gypsy Subbasin Drainage and realigrunent of the culvert under the site will occur. Fill of the existing Gypsy Subbasin Drainage ditch will be completed pursuant to substantive provisions of the Washington State Department of Fish and Wildlife (WDFW) Hydraulic Code, WAC 220-110- 030 and consistent with the Lakes and Streams Report, Appendix H. The work will be completed under the administration of Ecology pursuant to the substantive preemption provisions of MTCA, RCW 70.105D.090(1), and Section XIX of the North Baxter Consent Decree. Each component of the cleanup action is described in detail in Sections 3 and 4 of this report. VULCl-19589-510 1-5 -"' ~ l " 2' ~ ,, •', ,.;.::,' "" c " "t.;; C ~ 1 ~ C t: -~~ -· ~ ·::; C _3' it " , .... ,.. ------ LEGEND ,1, ------L==-::J ASPHALT / CONCRETE 0 c:::::::) TR FE S ,;::: ~I l'L. 'i·----~~,~= 1 ~ p II-l \ ,( j I ,- 18. :r« __ it I \ I • 5!1"48',-~ I Afl. I • -I 111 l 1 I :f \ \ 1 ' r~ ~ L <- --WETLAND 00 \:_ 0 , ' 0 \ 060 \ 0 ' ' BAX o S,,~' ... BAX-t5 .-&\DI \ / o 1l BAX-88 / / \ j\ 0 0 ,/ / __ ....... j \ ' !/' \t 1_; 11 : 11 \11 SOUTH BAXTER \\ l PROPERTY '-,. \ -"~, '--, I I I 11 ~;I -1- +-I -Ii I -1 · l 1 ··iee-"'°77Qo,~ !'.2,,·,, ..... ) '-oG LAk[ ~4w •. ~ WAsH!NcroN \ :i. .• 1~- ~-.. ____ rl~ "\ r •orw.,..,""...,.,._ (Ja"t,1n.....i) Q ..... %_ (Jo"~ """'i . ......,5 \ \ 1!;p3 NORTH BAXTER PROPERTY· 0 0 (:.;,!o ~-\ .... 1-. ~ 0 0 0 0 .BAX-10 0 0 . ~·. ~ I .~~~"" o r;J,~••· i ~ ----------[==-::J 0 " BUILDING CHAIN LINK FENCE PROPERTY LINE "ROPERTY BOUNDARY (NORTH AND SOUTH BAXTER PROPERTIES) WELLS TO BE DECOMMISSIONED COMPLIANCE MONITORING WELLS I L....:::,~11 ~ ,i Ii) :Ji I \' \ ,l I ! \ \ :l' "'4" ;'.~--a GYPSY Jo·~~s .,,, /) Q ":~. I ~1 ~ cJ ~ ·i O"DU:l<IUC1ISWJSIE/! {J:l~FnTIUI) \. l • -.,.. ... '4 NBB-1 NBMW-1 , SUBBASIN : ------------\---~-----, ____ ., ___ ...,,......-0--~ • ' ' ·--·-+----.---=-:=-===---' -1#=Wii--==k:J=A .. --, ,--=-~----·--...-- >= •= ,r_!0'1!1".~ :;, II J ~ ir-r-•---•---• ___ , .~.·-· _. _._._, __ _ 6"ffi~~-= ·-----------· , . ..,.~£2: -··----,---· ·---•---·---·---· --· .-,,------·-----~ ~ i RIPLEY ·' =---·-----· LANE LAKE ' WASHINGTON BLVD EXISTING SITE MAP SEAHAWKS HEADQUARTERS AND TRAINING FACILITY lll II,...~ AQ589-510 }l 50 O 100 / ~ 0 RETEC ~--" oo· \ L---~'u:'.:'.-~::..:_·-'.'.'.:' ~"._,----+--------rAFIGGIUJRREE 1V-11I ~ L.::~:..:~:.:.==------------------------------------~1:~:1~::_-----~=-----Jo~A~TE~, 1~o~;fs;Jo~5==:Jo~R:"'~'lE!.M~/~S~E~A--L------L-----------...L~~~..!:.:...---' 2 Regulatory Framework This section provides a discussion of Ecology and other regulatory requirements that have been applied to this remedial design. 2.1 Model Toxics Control Act Design Requirements In accordance with the FS and CAP, MICA Method B cleanup levels are applicable to the Sites. These criteria define the extent of remediation required to prevent public exposure to impacted areas of the sites. Soil cleanup levels are based on human exposure via direct contact. Capping the entire sites with soil or other development features will satisfy these cleanup criteria. The groundwater cleanup level is based on protection of surface water. Cleanup standards for the site groundwater are MICA Method B surface water levels with the point of compliance at the shoreline. The selected remedy, including previous cleanup actions, focused on actions that included extensive source removal and stabilization to eliminate the need for groundwater remedial actions for the dissolved phase of the groundwater plume. 2.2 Other Regulatory Requirements 2.2.1 Health and Safety Washington Administrative Code (WAC 292-188) specifies Safety Standards for Construction. This code specifies health and safety standards for responding to releases or substantial threats of releases of hazardous substances at hazardous waste sites. The Occupational Safety and Health Administration (OSHA) specifies health and safety requirements for hazardous waste sites (29 CFR 1910.120). Details regarding the use of 40- hour trained contractor personnel and requirements for the contractor's health and safety plan are provided in Section 5. 2.2.2 Stormwater Management Because the area to be disturbed during remedial activities exceeds one acre, remedial action and construction activities must adhere to substantive requirements of the General Permit to Discharge Storm water Associated with Construction Activities. A Stormwater Pollution Prevention Plan has been prepared (Appendix C) that includes Best Management Practices (BMPs) for managing stormwater during remedial activities. These BMPs are outlined in the King County (2005) Surface Water Design Manual. Due to the presence of contaminated surface soil throughout most of the sites, stormwater collected during construction activities from areas of the sites subject to environmental capping will be discharged to the sanitary sewer. Construction VULCJ-19589-510 2-1 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington activity will occur in the shoreline area, outside of the area requmng environmental capping, This activity will include placement of stormwater discharges and riparian planting, BMPs for the shoreline area are addressed in the SWPPP. 2.2.3 Shoreline Master Use Permit Remedial actions and construction activities within shoreline jurisdictional areas must adhere to substantive requirements of the Shoreline Management Act, RCW 90,58, and Shoreline Substantial Development Permit regulations (WAC 173-14) as applied through RMC 4-3-090; however, a permit is not required due to MTCA' s procedural preemption. This preemption applies to cleanup activities only and a separate Shoreline Substantial Development Permit is required for development activities, and will be administered by the City of Renton, Erosion and sedimentation controls are addressed in the Stormwater Pollution Prevention Plan, in accordance with BMPs for managing stormwater during remedial activities. Appendix D includes a letter from the City of Renton outlining the substantive requirements associated with shoreline regulations which will apply to cleanup activities. 2.2.4 Fugitive Dust Emissions 2.2.5 2.2.6 The Puget Sound Clean Air Agency (PSCAA) provides air emissions criteria for the site. Section 9.15 of Regulation I discusses the requirements regarding visible emissions of fugitive dust. Measures will be provided to suppress any fugitive dust generated during site grading that exceeds Regulation I criteria. Noise Control The Washington Noise Control Act (RCW 70.107; WAC 173-60) and the Renton Municipal Code (RMC, Title 4-4-060) provides maximum permissible decibel (dB) levels for all site activities, construction equipment, and portable powered equipment in temporary locations. Work will most likely be conducted during daylight hours (7:00 a.m. to 8:00 p.m.), such that excessive noise will not be generated. Grading and Filling The Renton Municipal Code (RMC, Title 4-4-060) provides requirements for grading and filling activities. Site grading includes unsuitable geotechnical material removal and excavation of utility trenches and site filling includes backfilling low areas at the site to specified elevations and preloading existing soil surface for geotechnical purposes. A grading permit is not required because of MTCA's procedural preemption; however, all grading and filling activities will comply with the requirements in the RMC. Appendix D includes a letter from the City of Renton outlining the substantive requirements associated with grading. VULCJ-19589-510 2-2 DRAFT Engineering Design Report, Seahawks Training Facility-Nonh and South Baxter Properties Renton, Washington 2.2. 7 Solid Waste Management Requirements for solid waste management are applicable to the non- hazardous waste generated during remedial activities that is to be disposed of off site. WAC 173-304 details the requirements that will be followed for the proper handling of all solid waste materials. 2.2.8 Working in Utility Easement Representatives from both King County/Metro and Puget Sound Energy shall be notified of work in the area and may be on site during activities. Figure 2-1 shows the location of all utility lines on the property. Design of the capping remedy will be finalized after consulting with the utilities. 2.2.9 Gypsy Subbasin Drainage Abandonment, Replacement, and Capping Substantive provisions ofa Washington State Department of Fish and Wildlife Hydraulic Project Approval (HPA Permit) are required for fill of an approximately 125-foot section of Gypsy Subbasin Drainage and realignment of the culvert under the site. The project is exempt from procedural requirements of the HP A permit from WDFW. The work will be completed under the administration of Ecology. WDFW will review the package to ensure the substantive requirements are satisfied. The HP A submittal package, including the Lakes and Streams Report, is provided in Appendix H. 2.2.10 King County/METRO Discharge Permit The rules and regulations for the disposal of industrial waste into the metropolitan sewerage system are established in Section 28.84.060 of the King County Code. As the water generated during construction activities is to be disposed of into the public sewer, a written discharge authorization will be obtained. The conditions and discharge standards detailed in the authorization will be followed. The permit will be obtained from King County Industrial Waste Program prior to initiating site activities. A copy of the completed Discharge Authorization application is provided in Appendix C. VULCJ-19589-510 2-3 .·.r, ~ ~ '\ i ~ <.:-, .•. ~f (.~ s t :2 % s r s ! I " -101 I N31"46 46 ~ ~~ ~<-0 ~ I /\~ 8 ~s ij \\~ 8 / ,8 .<tr \ '. S.31'46'46~ """E) \\I.· .. · a-.··.;.>'. .. ' I ~ .·· . . . I , , I. /;+H ~ ";&';I\ i ' ,:~I! I/·· I g-\.~@ '"'. \~\ ~ ~~·' I LJ) I IJ i '1./t I. i 1-/1 ~ 'i' If /i. 11 f- 1 1 I /:··. : I' ,. '' i/ ,;,. 'I ( I I . I , I / .~ .. r_ 1 I • I I I \: .· .. I ', I ' i I . ''I ;!s) ' " • "11·,. I I -,.,0 o -,,, J ~.,l. I j 0 /i,; O -~~4-l ........ .. (_:, - '-.._ «r:rn\ ~v/\~ >\( \ \ \ Bft)(;'['s PARC(L SOJTI1 \ \ I I I I I ~ I I I I I I J t I I !1 I I ~ I l\ I > \ : \ - I I ,c--------~ \ "' ·-- __ ____...,SS ~~~ ~I 'i,.9·\ I ssL I -_J --c·"' ---:cc-~' ~=-.;::___ °'. I \. c.c. ::::::-. 'I ~ ..... ~ j ---l - ~ ffllo,• 'i. ---:\ ----· N:3'0'56',-6.E 'CC ---------L•GEND 1J9J.75• --------LIGHT POLE ----------LAk£ -• HYDRANT/WATER VALVE UTILITY /ELEC POLE \ \ ' \ ' \ "'"'\. \-: ..... .,,. ···i ~- WASHtNcroN I ---ELECTRICAL GAS SANITARY SEWER STORM SEWER TELEPHONC: WATER PROPERTY LINE ! "\\ ---r,~\l. __ /_.--------~~-\(~1:·1 "'\;F" ~ -~""'-------,I 1,1 ---~~ ---------• 1 · I \ I ~' fi ¢" I !~ ~ .. ,:: u, ~ -< n 0 < n \ BAXTER PARCE.L NORTI--\ t g ,\ • '1/ ~:. N I -:-:----=-----~-_---=-~,: n;. ~I I Ji! I .lJ N J ~!·~ ' I I @ ~;, n 0 z 0 0 Se ,e C ,:: () 0 " " ' n X /' .,..-:;_? / _.// ® t~~ ,t\8 'i-\'\ """ '--i\ '<2', ~:\~t- \ ... ~~~ I' j~;} ' ~ 4 i1 /\, '/~c:__, \ r p--= --c.._c; ---~--10410.51' \'\''\ ---'~ :., ;_:,_-. -=-- 1" -=-::. --------~ ----------=--.::::=:-=. ------==----=-=------=-==--"'"'"',..::, __ ---=--==-------=-= --_ ----=---=--------==::2---=--=-----~-=-----~ ~J ' -I · _-_:_:___ ,-.:.~-~~~, ---=--------~-= -------=--·~'"_, --~~_:_ ~~-cc. ------==--::s-=t--~-~ ----"' ·-------·,----- ~ = SOURCE: SITE DRAWINGS FROM MKA & CRAWFORD ---:-------~-~-.ti/ ---1 -- !I.RETEC 50 0 r-.-.-1 100 SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULC1~19589-510 UTILITY LOCATION MAP '~ / 1"=100' ._----------------------------------------------------------------J;'~'~''2•'!,:0~/~5/2o~e:...:==Eo:s::WN:;•jE~.M~./2;S~E~A==J:=======r:============JlF;!l~G~U~R~EJ2[·j1===J 3 Design Criteria This section presents the design criteria, or basis of design, for the remedial action requirements as presented in the CD. Design criteria for each component of the remedy are described in the following sections. 3.1 Wetland Mitigation Based on the J.H. Baxter Property Mitigation Analysis Memorandum (AESI, 2000), no remediation impacts to shoreline or wetland resources would occur on the North Baxter Property. Consequently, the proposed capping of the North Baxter property will not require wetland mitigation. Wetland restoration and enhancement of the buffer at the Lake Washington shoreline located on the South Baxter property was completed in 2002 as described in the Construction Completion Report (RETEC, 2005). There is a 50-foot averaged shoreline buffer zone surrounding the restored wetland that is to be protected from redevelopment activities. Encroachment of this buffer zone is anticipated during redevelopment activities at the site but only to the extent that the required minimum buffer width of 40 feet will be adhered. Any disturbance to this buffer zone and wetland areas during construction activities will require wetland mitigation as specified in the CD. Football NW is proposing to increase the wetland buffer width in other areas to maintain a 50- foot averaged buffer. Improvements to the wetland buffer will be designed in accordance with the J.H. Baxter Property Mitigation Analysis Memorandum (AESI, 2000). Documents related to the wetland are presented in Appendix E. 3.2 Wood Waste Area Previous geotechnical evaluations characterized conditions on the North Baxter property. More information about the investigation is contained in the Geotechnical Report (Shannon and Wilson, 2006). Results from the geotechnical investigation indicate the presence of decomposed wood chips to be present at two locations on the North Baxter property (Figure 3-1 ). The wood waste will be temporarily stockpiled at the site (North Baxter Property) upon removal during site construction activities. Samples will be collected from the wood waste stockpile to characterize the material. Based on sampling results, the wood waste material will be either used as on-site fill material ( capped if necessary) as deemed necessary by the onsite geotechnical engineer or transported off site to an approved recycling or disposal facility. 3.3 Building Foundation Spoils The proposed site development work includes construction of an indoor practice facility and a three-story office building. A foundation permit from the City of Renton is required to complete this work. Based on the VULCJ-19589-510 3-1 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Geotechnical Report (Shannon & Wilson, 2006) completed for the site, drilled shaft foundations are recommended for supporting the planned buildings. Drilled shaft foundations are cylindrical, cast-in-place concrete shafts installed by large-diameter auger drilling equipment. Spoils resulting from drilling activities during installation of the drilled shaft foundation will be managed as part of the environmental cleanup portion of this project. The soil will be temporarily stockpiled at the site (North Baxter Property) upon removal during site construction activities. Samples will be collected from the soil stockpile to characterize the material. Based on sampling results, the soil will be either used as on-site fill material (capped if necessary) or transported off site to an approved recycling or disposal facility. 3.4 Site Development Cut and Fill The environmental cap will be constructed utilizing suitable imported fill material. Existing site soil will be graded prior to placing the environmental cap. Soil will be cut from certain areas of the site that exceed the final design cap elevation and reused on other portions of the site to fill in low lying areas. Specifically, soil from cut areas will be excavated, amended with Portland cement and used to fill in the natural turf field area. Based on the Geotechnical Report (Shannon and Wilson, 2006), 4 to 6 percent cement (based on dry weight of soil) is recommended as an additive per cubic yard of soil. Imported fill material may also be used as described in the following section. Any soil that is cut and reused on site, will be placed under a suitable environmental cap.· 3.5 Import Fill Clean soil used for the environmental cap as required by the CD shall be imported from a commercial gravel pit or from a generic construction site (location to be determined at a later date). For import fill that originates at a generic construction site, fill material will be tested for some or all of the following constituents: priority pollutant metals (Method 6020), total petroleum hydrocarbons (NWTPH-HCID Ecology Method), total petroleum hydrocarbons gasoline range (Ecology Method NWTPH-D), total petroleum hydrocarbons diesel and heavy oil range (Ecology Method NWTPH-Dx), volatile organic compounds by USEPA Method 8260, BTEX by USEPA Method 8021, PCBs by USEPA Method 8080, and PAHs by USEPA Method 8270 SIM. These chemical tests will be used to verify that no hazardous substances are present in the soil that exceed MTCA Method A or MTCA Method B cleanup levels for umestricted site use as specified in WAC 173-340-200. VULCJ-19589-510 3-2 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington For fill material that originates at a commercial gravel pit, written certification including chemical test results will be obtained from the material supplier to ensure that the import material meets the requirements. 3.6 Stormwater Management 3.6.1 3.6.2 Stormwater management during construction activities at the site is specified in the Stormwater Pollution Prevention Plan provided as Appendix C. The technical approach for managing stormwater at the site after completion of Site construction activities is provided in the following sections. The stormwater management approach is based on King County's (2005) Swface Water Design Manual. Stormwater generated at the site will be subject to enhanced water quality treatment and discharged to Lake Washington. Discharge will occur via five new drainage system outlets. The new pipe outlets will be constructed as rock-lined channels to provide energy dissipation and protect against erosion and will release water above the ordinary high-water mark of Lake Washington. Native willow stakes will be inserted into the energy dissipation areas to re-vegetate. Stormwater technical information is provided as Appendix F. Synthetic Turf Field and Building Roof Areas Stormwater runoff from the synthetic turf field and building roofs will be drained to Lake Washington as direct discharge. Precipitation that lands on the field will drain vertically through sand and gravel and will discharge to Lake Washington via the storm drain system. Natural Turf Fields Precipitation that lands on the field will drain vertically through the sand layer that functions as a sand filter for enhanced stormwater treatment and will discharge to Lake Washington via the storm drain system. An Integrated Pest Management Plan has been prepared (Appendix G) to address pesticide and turf management practices as it relates to protection of stormwater. 3.6.3 Paved Parking and Driveways Stormwater runoff from paved parking and driveway areas will be collected and directed to large sand filter areas covered with either grass or an additional layer of sand. The grass cover or the additional sand layer will intercept fines and provide pretreatment. Low hnpact Development elements such as porous pavers or Grasspave"' may be utilized in small areas ( fire lanes) to reduce storm water peak flows from non-treatment surfaces to the sand filter areas. Stormwater collected in the large sand filters will be discharged to Lake Washington via the storm drain system. VULCl-19589-510 3-3 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington 3. 7 Environmental Cap As discussed in Section I, the North and South Baxter properties require an environmental cap over most of the sites. Construction of a final cap can be summarized into five different types of caps. The five types of caps to be constructed are: • Field Cap: This cap consists of the three outdoor natural turf practice fields and one outdoor and one indoor artificial turf practice fields. • Concrete Slab Cap: This cap consists of the concrete structural slab of the office building, other on-grade, concrete slabs, and concrete sidewalks • Asphalt Pavement Cap: This cap consists of areas that include pedestrian access, surface parking and roadways. • Landscape Cap: This cap consists of areas used for planting beds, sand filters, bioretention swales and hardscape areas. • Membrane Cap: This cap consists of utility easement area and other areas along the eastern edge of the property boundary. Cap location areas discussed above are shown on Figure 3-2. Utility trench construction related to installation of all the utilities (stormwater, sanitary, gas, and electric) at the sites will be considered as part of the environmental capping portion of this project administered by Ecology. Utility trench construction and backfill will be completed in conjunction with environmental cap for the site. Figures 3-3 through 3-7 show the typical environmental cap cross sections that will be constructed. A discussion of these various cap sections is provided below. Field Cap For the Natural Turf Field Section: • The 3-foot-thick clean soil cap consists of three layers. The base course consists of 14 inches of clean import soil overlain by a 4- inch-thick gravel capillary break layer and 18 inches of clean sand. • The soil layer will be a free-draining sandy loam that supports the vegetation layer. The 18-inch-thick sand layer will meet the requirements of the large sand filter in King County's (2005) VULCJ-19589-510 3-4 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Surface Water Design Manual. The free-draining nature of the soil and vegetation will prevent surface erosion. • The cap will separate site users from the chemicals of concern present in surficial soil, and will contain an indicator fabric layer at the interface between cement-treated on-site soil and imported cover soil. The identifier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the new soil cover. For the Artificial Turf Field Section: • The cap will consist of five layers. This section is typical for the outdoor artificial turf field. The base course will be at least 12 inches thick and will consist of imported clean crushed rock overlain by at least 1.5 inches of porous asphalt. A fiber- punched polyurethane coated woven fabric will be installed over the porous asphalt pavement. An energy absorbing layer consisting of granular rubber and binder (approximately 5/8-inch thick) will be installed over the woven fabric. The top layer will consist of 1.5-inch to 1.75-inch thick granular rubber and washed sand mix overlain by synthetic turf material. • For the indoor artificial turf field, the cap consists of four layers. The subbase course will be at least 4 inches thick and will consist of crushed rock liner bedding material. A 30-mil geomembrane liner will be placed over the subbase course with a I percent slope for drainage. The base course, consisting of at least 12 inches imported clean crushed rock, will be placed over the geomembrane liner. A fiber-punched polyurethane coated woven fabric will be installed over the base course. The top layer will consist of 1.5-inch to 1.75-inch thick granular rubber and washed sand mix overlain by synthetic turf material. Alternatively, the indoor artificial turf field may be constructed similar to the outdoor artificial turf field as specified above. • The cap will separate site users from the chemicals of concern present in surficial soil, and will contain an indicator fabric at the interface between native soil and imported crushed rock base. The identifier layer will be placed over the existing surficial soil before placement of the crushed rock base. The identifier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the crushed rock base. VULCJ-19589-510 3-5 DRAFT Engineering Design Report, Seahawks Training Facility -North and South Baxter Properties Renton, Washington Concrete Slab Cap There are three different types of concrete slab caps and each will consist of two layers. • For the structural concrete slab section, the base course will be at least 4 inches thick with a vapor barrier (6 mil plastic) and will consist of imported clean crushed rock overlain by at least 8 inches of structural concrete. • For the concrete slab section, the base course will be at least 4 inches thick consisting of clean import crushed rock overlain by at least 6 inches of concrete. • For the sidewalk section, the base course will be at least 4 inches thick consisting of clean import crushed rock overlain by at least 4 inches of concrete. The concrete section cap will separate site users from the chemicals of concern present in surficial soil, and will contain an indicator fabric layer at the interface between native soil and imported crushed rock base. The identifier layer will be placed over the existing surficial soil before placement of the crushed rock base. The identifier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the crushed rock base. Asphalt Pavement Cap There are three different types of asphalt pavement caps and each will consist of three layers. • For the light duty asphalt pavement section, the sub-base course will be at least 4 inches thick and will consist of imported clean crushed rock overlain by at least 4 inches of clean import crushed rock base course and at least 2.5 inches of Class B asphalt pavement. • For the heavy duty asphalt pavement section, the sub-base course will be at least 4 inches thick and will consist of imported clean crushed rock overlain by at least 6 inches of clean import crushed rock base course and at least 4.5 inches of Class B or porous asphalt pavement. • For the pedestrian access pavement section, the sub-base course will be at least 4 inches thick and will consist of imported clean crushed rock overlain by at least 4 inches of clean import crushed rock base course and at least 1.5 inches of Class B asphalt pavement. VULCI-19589-510 3-6 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington The asphalt pavement cap will separate site users from the chemicals of concern present in surficial soil, and will contain an indicator fabric layer at the interface between native soil and imported crushed rock base. The identifier layer will be placed over the existing surficial soil before placement of the crushed rock base. The identifier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the crushed rock base. Landscape Cap There are four different types of landscape areas. • The general landscape cap consists of two layers. The base course consists of imported clean soil of varied thickness overlain by 4 inches of clean import topsoil. The cap will separate site users from the chemicals of concern present in surficial soil, and will contain visual indicator layer at the interface between native soil and imported soil. The 30 mil geomembrane may be replaced with soil indicator fabric if the thickness of the import soil fill and topsoil is at least 36 inches. • For landscape areas that involve planting of trees, the cap section will contain at least 36 inches of clean import soil underlain by an open aperture geogrid material to facilitate structural root development. The geogrid material will also serve as an indicator layer. • The Grasspave ™ section consists of three layers. The base course consists of clean import fill at least 20 inches thick overlain by compacted sandy gravel base at least 12 inches thick overlain by Grasspave"' rings filled with clean import concrete sand overlain by grass. Clean fill soil will be placed beneath the base course. The cap will separate site users from the chemicals of concern present in surficial soil, and will contain a soil indicator fabric at the interface between native soil and imported fill. Alternatively, a gravel cap may be built as a substitute for the Grasspave"' section. The base course for the gravel cap consists of clean import fill at least 20 inches thick overlain by compacted gravel base at least 16 inches thick. The gravel cap will separate site users from the chemicals of concern present in surficial soil, and will contain a soil indicator fabric at the interface between native soil and imported fill. • The sand filter section consists of two layers. The base course consists of clean import soil at least 18 inches thick overlain by clean import sand at least 18 inches thick. The cap will contain VULCJ-19589-510 3-7 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington an indicator fabric layer at the interface between native soil and imported soil. The side slope of the sand filter will be 3H to 1 V. Membrane Cap For the membrane section, the cap will consist of 12 inches of clean import soil underlain by a barrier (30 mil geomembrane) at the interface between native soil and import soil. The barrier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the import soil cap. 3.8 Gypsy Subbasin Drainage Abandonment, Replacement and Capping An approximately 125-foot open existing stormwater ditch regulated as a Class 2 stream by Renton is located toward the northeast corner of the site will be backfilled as part of the environmental cap. The remainder of the Gypsy Subbasin Drainage is in a culvert under the site. The Gypsy Subbasin drainage enters the property from the east via a 24-inch culvert that extends 46 feet under a former dirt haul road from a drainage ditch running parallel to the west side of the railroad tracks. The culvert opens to a drainage ditch with highly confined, steep walls that extends approximately 125 feet to the north. At the north end of this ditch, a 24-inch culvert extends 490 feet under the majority of the North Baxter property into Lake Washington. As part of environmental cap construction, the 125-foot drainage ditch will be filled and a larger diameter stormwater pipeline will be installed to reroute the existing culvert location that extends to Lake Washington. From the eastern property boundary, a 54-inch culvert will connect to a 60-inch culvert and the 60-inch culvert will connect to a 72-inch culvert and the 72-inch culvert will connect to the existing 24-inch culvert from the railroad drainage ditch and reconnect to the original 490-foot 24-inch culvert just before it empties into Lake Washington. Any potential fish passage to Lake Washington from the drainage ditch is currently inhibited due to size of the pipeline and elevation. Installing a larger diameter stormwater pipeline helps increase the potential for fish passage and reduces potential for silting in the pipeline. Details of the current Gypsy Hydraulic Project Approval submittal, which includes a Stream and Lake Study, are included as Appendix H. Improvements to the stormwater drainage system may occur in the future. The City of Renton is considering a capital improvement involving construction of a new outfall along the shoreline of Lake Washington as part of a basin-wide undertaking separate from the Seahawks project. No further details are available at this time. VULCI-19589-510 3-8 I ,k 1-1" i /9!:,89 '. Sc:1howks Prodir:c ft;ci!dy l.UN 20Gh] WrYJr!i':h,p :;omol,f/q i0cot.·~:r,?.dwq I / oyr;,,,: /?, f-/ U.<x,r· ,:m(Jr5h'J/i i-Yr;/1,y./" (,ct ()!J, ZuO( -J. i{'Hr! ,(r,:(,, ~: I I I '""""""'-· r / ':ii I~. ---;19·~. -::'~~~-;,; ::~;.,;,:.\::c.~~ ··:· . .. '"' ·.:;:.~·-· L .\ ' .. ::i,':. : l--------------17 ROCK _/ (t;,··J I ->;··i'-..J ~------_. l '.\\,•',,.,, .. J. --rf .-~ _J .... 3~. .. ... _. r----, ~-)"\·-,·ii------1 SEAWALL . ( ·. 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[' SUBBASIN , \ -I ! DRAINAGE I :,:' ' '" n c, , I •;!' I ' ' I NORTH ', I BAXTER : : ' ' ,/') w • I ,, ' ' I I I • I ,': ~ I h I I y I ~ •, i I \ ,·( '/ I: "'II 'I, I ;:_,• 'Ii I , :W ·.,··. :J-i 1t· ' ~( c-..;' 11 '; lj,11 '1 ";;!, f 1! '1 I : 1. :-11 I' I H1 11, . I , I iii d, I I 1 1 I 111 I Ii I / ,r---\ ' i / \ \ • ' I .d:,_ ··,) \ \ NORTS PROPER1Y LINE O /'-cj , \ \ OF DEMARCATiciN~r\ -----',---- I 0 :. 1--y-1.li- 1 '~ I H . -~~ ~ 1~,-~,--;•,cL" .. 1 • 1 _. . I' I., 11 N 58'13'14" W .._; \ .. ./ / ' ,. '.".' ? I'... LEGEND ·-~}-I ' .. I f:\,, (\, ·, ,, .. ---0 /~ c--.1. \--' \ '-.. ?i ------ \J / I ~--/ " I ~I . ~ .· / ·~ I '0 •: 1 I l r;t, NI ', ~ I I' v, ,-, ,, 'f1 1.-,_ ,,,,__ ,"-c/ ~ \ •1 L· .~ II l_~:.u rf BUF'FER SOUTH BAXTER c•/ , I ~:W-·t·,: ''.; 1·. ~._.· \ ''I I I I n ,c5 \ \ I . I I< . ,L -------- , l ,,1 f ·--,--¢-·/ I :, '.t.'7 .. -~ .{ _, ')f.-'. -')'..;._ ,, ' )C ~,; t , I I II / ·1 I, \ '{ I ' ·;_b 1_:v .-~ -.... _I ··,'-·· ,,, 1111 ll I /.>', 1 -...c I I rt I ;1 :,-,i '[1 1, ' I :jl i I If Ii 1 ~I I I I i [ 1 I ---~ PROPERTY BOUNDARY \ ~o--u--:J .,_ CHAIN LINK FENCE • ... .RETEC ESTIMATED WOOD-WASTE LOCATION TEST PIT LOCATIONS TEST PIT LOCATION -WOOD WASff IDENTIFIED SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULAN-16756-100 DAlE: 10/5/06 DRWN: E.M.LSEA 60 0 120 1 "=120' WOOD WASTE AREA TEST PIT LOCATION FIGURE 3·1 " 1 ~ C -'2 ~::, 'U -ts '(_~ C:·, 6 ·e;::, ~ _f : ~ i ~ ~ ~--'----~~----i ! I I ~-~-~I i ,-_ --~---'----~ I I r--- ' i . I I E I 1 I -• ~--~-~----'I : ~ : ! i I LEGEND NATURAL TURF FIELD CAP I • 4 , I CONCRETE SLAB CAP I~ o ~ o d ARTIFICIAL TURF FIELD CAP RUBBERIZED MAT OVER CONCRETE K(;,')y STRUCTURAL CONCRETE SLAB CAP ASPHALT PAVEMENT CAP ---50 FEET SETBACK SAND FILTER ~',;-ITc'ii;S~i I LANDSCAPE CAP I . ·.. I MEMBRANE CAP &//i1!///J GRASSCRETE/GRASSPAVE SAND FILTER ,-~-,,-. (1 ---I / ------~u ; I ' I , ~, ' .. ,. # ' . ' . ' ·~ ·E= I PUBLIC !ACCESS PAVEMENT 6 ' :;:_, " G ' ,· ' "' ~E~PHAL~~--=-=---=-=-~TTHICKER ASPHAlLT ~ _ . . ' . ·I I . L* MM I ~ J .§ ., ' . , x! § ~ & , ' . . ' ' .. , J ~ ---~-~~~-~ ~ ~~--~---_::::, .ir--. K --.... .If-=-= '" ::::~ 0 Cc d-• . _. ,I\ ~· • ~ . ' . SAND FILTER :t cir-------------------------------------------------------+--~--------------------------------j ~ " 2.• ~ SOURCE: SITE DRAWINGS FROM MKA & CRAWFORD ~· ETE( 5 ~_; 1 ~ 0 PRACTICE FACILITY CAP LOCATIONS Q t.'\ R / SEAHAWKS HEADQUARTERS AND ~ 1 "=lOO' VULC1-19589-510 ..,,_ OAT[; 10/5/05 DRwN: E.M./SEA FIGURE 3~2 Irie. .1 i" i ./.9,'.;8.9 :, ! 9.':89;("). C~ .'.: dwr; i 1;01Ji: l /()/ll.1 .f-} th Rt· r:rrnrsi!o/i .1-'.k;/leJ ()c:.I lJt; /()()6 -l l.-(J/om Xrd ·,. .RETEC l ~ SYNTHETIC TURF 15 .. ~ '.:'.1111111;'.llll'.ll'.llll~l,lll~~l,ll~~llll~'.~1'1~~1,:1,1~~1.:~~1,111~?~::~~~: :~:::: :~~ ;~sD:~D SAND MIX j ...,~ · · · · · · · · · · ·· · ·· · ·· · · .·. · · "---FIBER-PUNCHED POLYURETHANE COATED · · ... . ... .. ...... , WOVEN FABRIC 1r-:/_~_. '. .-". '. ~ ~· ,,. ·, ".. } . "--POROUS PAVING (ASPHALT) -'-~.-J--' ---' ' ' ' ' "-' -------~ CRUSHED GRAVEL ' '~ EARTH OUTDOOR ARTIFICIAL TUR, FIELD SECTION INDICATOR FABRIC 1_ 5 • TO 175 .. 1111111111111111111111111111111111111111111111111111111111111111111111111111111~~::::~~ :~::ER AND WASHED SAND MIX FIBER-PUNCHED POLYURETHANE COATED J "'.. WOVEN FABRIC 8 j ' ' ...l.____L_ · -{ ~{ ' "------CRUSHED GRAVEL 4" :,·-;:_', ._<. •,_·:_::: ,·: :.:->;-· .: .. ·, ,:: -~-----CRUSHED ROCK LINER BEDDING ~ .. ';/:.,· :\,:·.J-'i! -' ,>~· i-11 .. ~I .)i°_', 0 -1~-7'-·-' !:. '.' _,-·. '.:· ·~~ 30-MIL GEOMEMBRANE T , ·, ,· T _.;_ -'· / 1 ·:-'--, ,-•• --~ _ .. ; :' .... , ~ (1% GRAOED SLOPE FOR DRAINAGE) "'-EARTH INDOOR ARTIFICIAL TURF FIELD SECTION ;; ROOTZONE SAND BASE SAND ''.-, ,:;/ CAPILLARY BREAK (GRAVEL) IMPORTED FILL SOIL, OR PERFORATED DRAIN PIPES IN PEA GRAVEL LOCATED WITHIN THIS lAYfR ......... ._ ... _. ... ""'""'"-""_.,-... .._ .... .., ....... _..._.._..., ... -. _____ ~ SOIL CAP INDICATOR FABRIC "~ CEMENT TREATE"D ---------------------ON SITE SOIL NATURAL TURF FIELD SECTION (WITH GEOGRID OR SIMILAR, AS SPECIFIED BY GEOTECHNICAL ENGINEER. THICKNESS VARIES) SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1~19589-510 FIELD CAP SECTION NOT TO SCALE DATE: 10/5/06 ORWN: E.M./SEA FIGURE 3-3 irit_ It' 1':f~h'.'.}1 l'f'JX!JY)1r ';dwq ;',~;Mi. /J(,./)1:Y :; 4 Usf'r: em,1rslv;1i Pio!l1;1· Or:i 1)5, /1)06 -9.-.J.')(}m Xre/'.s·. CLASS 8 j_ I ASPIIALT 2Fi" / /<///2/_,/>'i/////J////j ~:~rc~U~~~FACE . . . ~ '' ' ' ' ''' ' ' '. ,_; " ~-._; '' " ' ': ' y \ ' ' ,, ,, ' ,, .,, ) ' _-• " · · -, _ • • -:-~ SUBBASE COURSE \ ;' . <-., ' ,, ' ' \ ' \ / T ',· '· .. ,,,, j', F· ,,,, ;0 ,,., •'·' ·<'• ,. k'·' . \ __ INDICATOR FABRIC LIGHT DUTY PAVEMENT SE_C:TION CU>.SS B / ASPHALT ~ · / , , , • · , / / ,f CRUSHED SURFACE ~ / / ,-/ ·>/ / / / /, /// / / // ( /" V BASE COURSE ·. ~ .•• \,~:., •.• ~, .. •'-,)·',i-~,1 ,<:;:;':~~:~;:.::;::'~;~~~~'. '1:1;;::'~i'.!y SUBBASF COURSE T INDICATOR FABRIC HEAVY DUTY PAVEMENT SECTION CU>.SS 8 ASPHALT ~ ,· .· , ,, ,... , .1 _,,-_., .,-/ _,_.. ,-; ,,.. / CRUSHED SURFACE 1 • •'. './(/,<<(;,({<~(~;((,({<<v_ BASE COURSE .4."_l_, . ' . '· ' .. •c-,_c·.'., .,,( <'·' •·'"' .:_ 1 ;c y SUBBASE COURSE t 4" i~~){-,--1,.· ,, ;',\.' ;.\·· . T INDICATOR FARRIC PEDESTRIAN ACCESS PAVEMENT SECTION .RETEC SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 ASPHALT PAVEMENT CAP SECTION NOT TO SCALE DATE: 10/5/05 ToRwN, E.M.£SEA T TFIGURE 3-4 /1/f_-1,1_·\ l9589·: :'9::!19Y!JFf,'_j_dwq i'J/Oui: .1/r~V/// j j STRUCTURAL CONCRETE r+.-·-----SLAB VAPOR BARRIER . .---(6 MIL GEOMEMBRANE) r· "--..__ CRUSHED GRAVEL "--..__ EARTH --INDICATOR FABRIC STRUCTURAL CONCRETE SLAB $ECTION j ·~CONCRETE SLAB ~.· . !, . . ~-------CRUSHED GRAVEL I ,--. -' . ' : ' "--..__ EARTH CONCRETE SL(IB SlCTION \'""'"'°" """" j ~ _CONCRETE SIDEWALK r. -.· . ----..._ CRUSH FD GRAVEL "--..__ EARTH INDICATOR FABRIC SIDEWALK SECTION .RETEC SEAHAWKS HEADQUARTERS AND NOT TO SCALE TRAINING FACILITY CONCRETE SLAB CAP SECTION VULCM9589--510 DATE: 10/5/06 DRWN: E.M./SEA FIGURE 3-5 i,:P it\ -'(./';(19': l?:·119XS/i.' .'; dwr:1 //Nrmi //(;'/JI// .i-6 Use.r. M'icJrsho/i Fioi!f!r".f-Uc.I tJt: /()()6 -9.Yi'om Xrel'.s· CONCRCTE CURB ASF'HAL T PAVEMENT OR CONCRETE SLAB .... ·--. '·, ',._, ,_', ~·=1 IMPORTED FILL TREE PLANTER SECTION PAVEMENT TOPSOIL LANQSCAPE SECTION OPEN APERTURE GEOGRID MATERIAL (INDICATOR FABRIC) __l ,· t THICKNE:S VARIES NOTE: 30 Mil GEOMEMBRANE MAY BE REPLACED BY INDICATOR FABRIC --IF IMPORT FILL AND TOPSOIL. THICKNESS IS AT LEAST 36 INCHES. .RETEC NOT TO SCALE ;"°,\i~--::i.":.:: :~:~ COt,PACTED SA.NOY GRAVEL !!ASE .~~=~ 20" ~IN ----CLEAN FILL lhlDIO.TOR FA!lRIC GRASSPAVE SECTION ~-· ~~~Z~lr;;it~l~:,;.,,,,rf,~~'~!,,-~,..""""-· t ..... IMPORfED LAYER MAY BE REDUCED IF SOIL CAP LINER IS usrn IN l.l[U or FABRIC SAND FILTER SECTION .........._EARTH SOIL c,,.p INDICATOR FABRIC ir~.'. ,7~~----c~- : . "-C0"4PACTED GRAVEL ·--·---~ 20" ~IN. I GRAVEL SECTION SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1·19589-510 ----CLEAN Fill INDICATOR FABRIC LANDSCAPE CAP SECTION DATE: 10/5_l06 ORWN: E_. M._LSEA FIGIJRE 3-6 h'1 .. t/: i.'h8.9! i.9.';H9;tgc__~.~twy i 1 2" t .RETEC ioyoui.-/i(;(}/?i .f-1 User: cmtJrshuJ: l-'i'olir:d ()cl 06: )006 -.9.-JU>;rn Yrpl 1\1f )s,~Iii~:~X\){f I0{~;j~~~{::;-,:[:f :Ytf ~::\1/~c~f ~:t{~,1J{k~,:}~·-... ,__ __ _ IMPORTED FILL SOIL 'I! __ NOT TO SCALE I -' i -" !I -Ii!-ii ' MEMBRANE CAP SECTION SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 DATE: 10/~06 DRWN: E.M.£SEA ~EARTH 30-M'L CFDMFMBRANE MEMBRANE CAP SECTION FIGURE 3-7 4 Scope of Work This section presents a general scope of work for remedial activities at the sites. Construction quality assurance and technical perfonnance criteria in support of this work are provided in Section 5. A schedule detailing design, remediation, and monitoring activities at the Property is provided on Figure 4- 1. Remedial activities at the sites includes site development cut and fill, utility trench and utility installation, well abandonment, water management, import fill testing, soil capping, site grading, stonnwater sewer pipeline abandonment and replacement, and long term monitoring of groundwater and assurance of soil cap integrity. Scope of work activities discussed briefly below include: • Construction specifications and drawings • Mobilization and site preparation • Site development cut and fill • Water management • Building foundation spoils • Import fill testing • Environmental cap construction • Site development grading • Gypsy Sub basin Drainage abandonment replacement and capping • Long-term monitoring of groundwater and soil cap integrity after recording of Restrictive Covenants for the sites. 4.1 Construction Drawings An early submittal construction drawing package has been provided for Ecology review (Appendix I). The drawing package consists of plans and specifications that specify the scope of work and includes Temporary Erosion and Sedimentation Control Plan, Site Demolition Plan, Early Grading Plan, Conceptual Utility and Drainage Control Plan, Gypsy Subbasin Storm Drain Relocation Plan, and Sections/Details Sheet. 4.2 Mobilization and Site Preparation The contractor shall mobilize to the site all the necessary equipment, labor, and materials to perform the work described in the following sections. Site preparation shall include the following activities: • Utility Locate. Prior to commencing any on-site activities, all underground public and private lines will be located and marl<ed with paint. Figure 2-1 shows the location of all known utility lines on the property. • Temporary Facilities and Access Controls. The Contractor shall install all required temporary facilities, including worker VULCl-19589-5/0 4-1 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington facilities and staging areas such as stockpiles and storage areas. The Contractor shall establish work zones including perimeter work zone security and barricades and exclusion zones. Entry points to the site shall be upgraded with crushed rock or quarry spalls. Details are shown on Figure 4-2. • Erosion and Sedimentation Controls. Temporary erosion and sediment controls will include best management practices (BMPs) for construction activities as shown on Figure 4-3. Details are shown on Figure 4-2. Stormwater surface runoff during construction will be controlled by interceptor swales and sediment traps and/or ponds. No construction site stormwater runoff shall drain as untreated surface runoff to Lake Washington. Stormwater resulting from construction activities will be discharged to the permitted King County Metro sewer discharge location adjacent to the sites. Other stormwater and erosion and sedimentation controls are discussed in the Stormwater Pollution Prevention Plan (Appendix C). • Health and Safety Plan. The Contractor shall have a health and safety plan reviewed by the Engineer prior to commencing on- site activities. • Site Clearing. The Contractor shall clear and grub the area to remove unsuitable materials from the site. • Site Demolition. The Contractor shall perform site demolition work as specified on Figure 4-4. • Well Abandonment. Four monitoring wells (BAX-5, BAX-IO, NBMW-1 and NBMW-2) on the North Baxter Property identified on Figure 4-5 will be decommissioned by a licensed well driller. The monitoring wells will be decommissioned in accordance with WAC 173-160-381. 4.3 Spoils from Building Foundation Location of the building foundation is depicted on Figure 4-6. Based on the assumption that the drilled shaft foundations have a diameter of 30 inches and average depth of 47 feet, the resulting spoils from drilling activities is estimated to be 2,400 cubic yards. Spoils resulting from construction of drilled shaft foundations shall be temporarily stockpiled at the site (North Baxter Property) by the Contractor. The Contractor shall line the stockpile area with plastic of sufficient thickness to prevent puncturing during placement of soils. The spoils will be temporarily stockpiled at the site (North Baxter Property) upon removal during site construction activities. Samples will be collected VULC/-19589-5/0 4-2 DRAFT Engineering Design Report, Seahawks Training Facility~ North and South Baxter Properties Renton, Washington from the spoils stockpile to characterize the material. Based on sampling results, the spoils will be either used as on-site fill material ( capped if necessary) or transported off site to an approved recycling or disposal facility. 4.4 Site Development Cut and Fill The contractor shall use the necessary materials, labor and earthmoving equipment necessary to move existing fill for reuse, where possible, based the final design cap elevation. As a result, there will be areas of the site where soil will be cut and reused on other portions of the site to fill in low lying areas. The contractor shall develop the site to maximize the amount of existing soils on site that is suitable for construction. Any soils deemed unsuitable for reuse will be transported off site for disposable to an approved off-site facility. The unsuitable wood material removed from the wood waste area is the only anticipated material that may require off-site disposal. Approximately 5,500 cubic yards of wood is anticipated to be removed from the wood waste area. Approximately 29,600 cubic yards of soil is estimated to be cut from the site. Approximately 52,900 cubic yards of soil is estimated as fill required for the site. Areas of cut and fill are identified on Figure 4-7. 4.5 Site Development Grading The Contractor shall grade the site to the lines and grades as shown on Figure 4-8. The existing site topography and the final site elevation upon construction of the environmental cap are depicted on these Plans. A 25-foot buffer along the shoreline will be maintained to the maximum extent possible during grading activities. Minor grading and filling will occur in this buffer associated with landscape and riparian planting. 4.6 Import Fill Testing As mentioned in Section 3.3, import fill will be obtained from a commercial gravel pit or a generic construction site. Approximately 23,300 cubic yards of material is estimated to the required import fill material. Import fill obtained from a generic construction site will be temporarily stockpiled at the sites. RETEC personnel will collect soil samples from the soil stockpile and submit the samples to a certified analytical laboratory in the Seattle Metro area for analysis. The samples will be analyzed for some or all of the following parameters: priority pollutant metals (Method 6020), total petroleum hydrocarbons (NWTPH-HCID Ecology Method), total petroleum hydrocarbons gasoline range (Ecology Method NWTPH-G), total petroleum hydrocarbons diesel and heavy oil range (Ecology Method NWTPH-Dx), BTEX by Method 8021, volatile organic compounds (including MTBE) by USEPA Method 8260, PCBs by USEPA Method 8080 and P AHs by Method 8270 SIM. RETEC recommends collecting I soil sample for every 2,000 tons of excavated soil up to the first 10,000 tons of excavated soil from the generic construction site. For the remainder of the project beyond the first 10,000 tons VULCJ-19589-510 4-3 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington of soil excavated, RETEC recommends a sampling frequency of I sample for every 5,000 tons of excavated soil. This recommendation is based on the assumption that the laboratory analytical results for the soil samples collected for the first I 0,000 tons of soil excavated indicate that the material is below MTCA Method A or Method 8 cleanup levels for unrestricted site use. In the event sample exceedances are observed at any point in time after the first I 0,000 tons of excavated material, RETEC recommends analyzing the failed parameter at a sampling frequency of I sample for every 2,000 tons of excavated soil for the duration of the project. Additional samples may be required based on visual or olfactory field observations at the site. Soil samples from stockpiles will be collected as composite samples. Samples will be collected by compositing soils from at least four locations within the stockpile, or more frequently as necessary. The locations used to composite will include a mix of different heights and lateral locations on the stockpile. At each location to be composited, the top 6 inches of soil will be removed, and the soil for compositing collected from the underlying soils. At the completion of import soil delivery to the site, RETEC will prepare a report to document that the fill is acceptable for use at the site. For import fill from a commercial gravel pit, the Contractor shall submit written certification for proposed fill material, signed by the material supplier, stating that the material meets or exceeds the specified requirements along with material gradation specifications and chemical analysis test results. The Contractor shall submit at least one set of test results for the import fill material per borrow source. If the submitted sample does not meet the project specifications, additional testing may be required by the Contractor and material supplier. 4. 7 Environmental Cap Construction The extent of the environmental cap to be constructed at the sites is shown on Figure 3-2. A 25-foot vegetative buffer shall be left between the cap and the shoreline to the maximum extent possible. As discussed in Section 3.4, five types of environmental caps will be constructed at the site based on the site development. The different types of environmental caps include field cap, concrete slab cap, asphalt pavement cap, landscape cap, and membrane cap. Examples of these environmental caps are shown on Figures 3-3 through 3-7. This approach to capping is consistent with the CD and CAP. Utility trench construction related to all utilities planned for the project ( storm water, water, electric and gas) will be considered as part of the environmental capping portion of this project and administered by Ecology. Trench construction and backfill for installation of the utilities will be completed in conjunction with environmental cap for the site. Trench construction details are shown on Figure 4-9. VULCJ-19589-510 4-4 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington The Contractor shall scarify existing surficial soil in the environmental cap area as necessary. An identifier layer shall be placed over the native soil in the environmental cap area and shall be installed in accordance with the manufacturer's specifications. The identifier layer may be colored to contrast with the native soil and provide a visual barrier that will alert maintenance workers or others if the cap has been compromised. The environmental cap shall be built to lines and grades as discussed in Section 4.4. The final grade shall be surveyed to ensure that the compacted import fill thickness meets the required specifications. Topsoil used in landscape areas shall be a gravelly silt loam to a silt loam, mixed with an organic amendment comprised of a well-decomposed, humus-like material. Topsoil shall have an organic content of at least 30 percent and be clean of debris and rocks larger than 2 inches in diameter. 4.8 Gypsy Subbasin Drainage Abandonment, Replacement and Capping The existing drainage pond located on the northeast corner of the site of the North Baxter Property will be backfilled and environmental cap will be installed. The location of the drainage pond and the stormwater pipeline is shown on Figure 2-1. A new 54-inch culvert will connect to a 60-inch culvert and the 60-inch culvert will connect to a 72-inch culvert and the 72-inch culvert will connect to the existing 24-inch culvert from the railroad drainage ditch and reconnect to the original 490-foot 24-inch culvert just before it empties into Lake Washington. Plan view of the new stormwater pipeline is depicted on Figure 4-10 and profile is shown on Figure 4-11. VULCJ-19589-510 4-5 ID Task Name 1 Draft EDR 2 Internal Draft I 3 ----liilen'l8f Review 4 EcoloOY R8Vle"W 5 Condltlonal A'l)proval of E8iiyeapPlng A 6 SWPPP 7 Submit NOi 8 Public Notice 1 9 Public Notice 2 10 Sita Grading/Fill Begins 11 FlnalEDR 12 ·,ntemal Draft 13 iOtema·1 Review 14 EC010QY 'Approval 15 ConstriiCtion ·---- 16 Install TESC 17 Rough Grading .. 18 Site Uti1itieS 19 Pllirig ,ind F ound8lions 20 ConCl'ele -BUi1diiili Slab 21 New Gypsy Culvert 22 Final Grading 23 Tllrf.Flelds 24 -Drainage and Subgrade 25 TU({SY5tem 26 Concret8 -Sidewalks 27 Asl)halt Paving -1st Lift 28 -·-candscaping 29 AsPhB'tf P3ving -wea~ng Course Project: EDRSdled Dale: Mon 10/2/06 Task Progress Milestone Summary Figure 4-1 EDR and Construction Schedule Qtr 1 2007 J Qtr 2 2007 Qtr 4 2007 Otr 1 2008 Q_tr 2 2008 Qtr 3 -~an I Feb I Mar Apr:1M& Jun Oct Nov-pe~ Jan Feb Mar A--r -Ma Jun I Jul an ·~ 7/19 /5 lli!lffll!ffiil!lll~/25 • . smillilll•l•~iiiiil!~,mi~B:t:111iiillr~~-.. 'llR®IMII 6125 l/19 1120 ~-~l!IY s113 9/24 1-~r=,::a-11-~=;~ 11/16 ' ---------·' ------~ ___ 612_6~lll1i!i(6120_ l!:~~!m~~Fllil!intm:1 Rolled Up Task li:j:Jmml~:,:,:~f!lJ!lf:!1;1~ External Tasks Rolled Up Milestone 0 Project Summary • • • Rolled Up Progress Group By Summary $ • • • Split ''""'"''''''"''"""""'''""'! Deadline 0 m • ' iu §i §! ~~ ..,.;·.~, i ."'CJ_] !i L.1, !, ! ;: I <= '.:i a.~ "11~~ •• i!; :i ~i <.> ·' .. ,. '' ~ ~< C ,I i! .. r -l i~ !i i. ,, ii!' • e • m 'j. ' ! '1 ' . \ ' ' >-Cl'. w 1/l ~ z ~ I 0 ~ 0 ' 0 ~ w w I '" ~ Cl'. 0 z 8, .. ' ' Cl'. w >::; C: 0 z ;f, ~ w i " m • iil ' t= ~ z 0 " 0 ::, Cl'. t;; z 0 0 " 0 a,!. i ·, l ~ I • J I \ ' h'D1/5_!0W,] .)JS(/ Z-/! ; <D z 0 G I!! ' 0 Ct' 0 LL s <t Ct: u l/l l'.) z s <t Ct' 0 w 1- l/l w u Ct' :::J 0 l/l !l ~ C C ~ rJ) z 0 ~ ... rJ) ----------NOTE: LOCATIONS OF NTERCEPTOR SWALE A~D 1-s ASSOCIATED ~----, STORMWATER CONTROL FACILITIES SHOWN ON THIS DRAWING ARE I I I ' "",_ r---1' L~~PLAC:;!f)ME --·t· --~ .@-I ., -··-.~.--- wm...'lJPlACEMENT . ·--, ,1 ---, - I 'i''° .:1SFD. '"" __ . /_ .---·--. ----'£.;0cc,=<0' ,:Jr-EDIMENT C ' --..__ ' . ---. ----- I '-· _, " I r:u--~ ~~PERTY ,,!to ' ',y l CD'NECT TO "'W"' '~-~ ""-~-.,, · TANK OR DI BAKER / ~-, ---.-. . . ·o·/ TO SEDIME"~ECT PUMP I '"~"_. '" POND ------+ -------' ------ROCK CHECK -_ ------DAM, TYP , I ---< /, ,.,-ooo••• , --/;----:E:@401 __ _ I -~ ---- I ,,,; ' " "' u•1~ OF WORK// I ~ I i ~ I " :§ I " Co :if~~ wsTING if~Eg~ 61Re'tf~RUMP sw.".:':';Jl;R 1220 SF FHR ENT PONO {,j t I t "'~·~· t l --------------- t .,..-CONCRETE TRUCK &: WHEEL l CONNECT TO BAKER TANK OR DIRECT PUMP TO SEDIMENT POND l ROCK CHECK {",j ~E2~40 1 SEDIMENT DAM, 1YP CE~ 401 CATCHMENT AREA' I ---------INTERCEPTOR -------+------SWALE, TYP 8 --------~ CE2~401 ....----t----f SEDIMENT POND \ APPROXIMATE. SLIGW MODIFICATIONS MAY BC REQUIREJ TO FACILITAE F'ELD co-~D!TIONS. SWM.E ;[DIMENT ~TCHM[NT AREA ~ / ....-C--I -----CE20J.~_(,ioi -----J --CONNECT TO BAKER ------ TANK OR DIRECT PUMP ----- TO SEDIMENT POND --------1-- t l l ----- LIMITS OF WORK \ I I \ \ I I JITT" --~ -,___--- --------1 ' -..........,.._,.__," \ ,--J -- "--~c-E"".,To~----,___ / ---\ \~/: 1 i/ ' SWALE,;;, R~CK CH:') ' --~~ m~olO', DAM, TYP cEJ~~o, J -1 -I t i I f'------------I i t l f ! ' : TRUCK • WHEEL I I WASHOU, N<EA I - - -- ! l 't;i i r, ~ WASHOUT AREA ~ cd~,o, CONNECT TO BAKER TANK OR DIRECT PUMP TO SED0,4ENT POND C(~4r,, i J ,d~~- 1 ~ -CONSTRUJ,ON , ',\ ENTRANCE' coi~040• ROCK CHECK CE2~401 /DAI.!. TYP ~ --------_,l___ / • ~1;~0;-------- g '1 " C r G --h "' ,, ' ~ ':0 c, '-' ~ " ~ " 'ci ~ ~ "' ~ (: ~ SOURCE: w..--coNSTRUCTION •· ~RANCE ~ ;,........_,._ CE2~'401 -------:------- ------' ------' SEIW,•E~· CATCHMENT AREA -j SW'LE, TYP c:,j ----------1' CEflj~~p·401 PROPER1Y UN[" [Pl ·~ ------·;;'.:. _____ ::=--=--=--=-=---===--=--=--=-=---=~--=--=--=-=---===--=--~-----~--=-=--~=---=-:=...--==--==--==------=-~~-----=-~ -=--' \,.._ DISCHARGE OF CONSTRUCTION LIMITS Of WORl<.7 , / S'TORMWATER THROUGH lrdH LID. " I INSTALL TEMPORARY MCTER PRIOR / , TO INSTALLATION OF MH. \ ( / l ,, I '\. / ______ '. SITE DRAWINGS FROM MKA & CRAWFORD ~ I • R SEAHAWKS HEADQUARTERS AND • ~ ~-I CONTROL PLAN -ETEC 50 0 100 / TRAINING FACILITY TEMPORARY EROSION AND SEDIMENTATION j!M~ 1 .. 1 OO' VULC1-19589-510 1 om 10/4/06 loRWN, E M./SEA I l FIGURE 4-3 I -------------- [ DEMOL!T!O'J Ft.N-; NOTE·s-J I UTIUTY DEMO' I 118N I ------,-@, REMOVE E"XISTINC STROM f)RA!N PIPING. CATCH 8AS·NS. -MANHOLES, SLOiT[l) DRAINS AND fRENCrl DRAINS I I ruv1s ; o REMAIN 0 EXISTING 8VFRH,,--AD Tri [Pf,Ql\'E/:,1)WER LINE AND .:iOLES TO REMAIN 0 EXISTING BUIL~ING TO REMA't, @ REMOVE ov::RHEAD -:"ELEPC,QNE/POWER LINES AND Pri1.::s. INCLUDING POLE FOUND1\TIONS 0 EXISTING DOCK TO REMAIN. r-----q I I f07_f _]1 ~ I i-~- ·( I, j I '-<> 1\ I : I I ~ <~ ~ n __ _:____J ---~C\0?~. SI ----1 SURFACE lLEMENT DEI/OLITION 1 ---- @ REM.9VE EX1Sr1NG FENCE. POSIS. FOUNDA~IONS ANO GATtS. ® REMOVE EXISTING BUILDl."JG, FOJNDATION, BASEMENT AND Bi::LOW GROUND UTILITIES. ~ @ REMOVE EXISTING LL;MINAl.~E ANO FOUNDATION @ REMOVE EXISTING CONCRfTr WAL~ _ ® REMOVE EXISTING COl':CRE'E SLAB ~ @ REMOVE EXISTING ASPHALI l~AVUJlNT. ----/-~ r- > µ-----------/-L ~ UI -~ 0 EXISTING LOG S[AWAl L TO RF:MA \ A EXISTING SANITARY ::::wER PIPIN(.; AtJD MANHOLES TO V REMAIN. -~ EXISTING STOR~ DRAIN Pl~ING TO REMAIN 0 EXISTING FENU TO fF\WI\. 0 EXISTlt..JC UFT STATION TO REMAIN 0 EXISTING ELECTRICAL CONDUIT TO ~l:)JA:r-.. <§> EXISTING WELL lO R°-MAlt.J (ADJUST TO GRADE) \ 1r:,', ~-·-~-- ~ I I I, ( I ~ c ~ >a " ~ 'c' "' <S 0 Ce ~ '.g t ~ a ~ '1 ,, ' " 1i: " ~ - i I I I ii I' j •I !r,<y ··, I /;/ (, U1 S1 I ~ _/ 1··· ]:' ··-· ~-_I ~-, . "" -/':';. --t ~ . .. . ~""--.. -I . --------,. U1 . ·· .. ·· 5 . ' ~ _ 'v:i -~-~-'~-_-~------~--.-6----.-,~--------! SOURCE: SITE DRAWINGS FR~M MKA & CRAWFORD \ SEAHAWKS HEADQUARTERS AND TRAINING FACILITY ? ------~---------= -- SITE DEMOLITION PLAN ~. 50 0 100 / .2:_ RETEC ~-j VULC1-19589-510 ; L==--=-=~=-=------------------------_:'_--~:..:1 :00'...' ____ ..:._ ____ _Jo~,rr::;_ . .:£'O~/•i:/0~6-.....l:,oe=~E;!:!.M;.:;.;s~EA::..__J ____ __J ________ .....1..:.,Fl::::GaaUR'-"E:..4 ... -4 ____ _, '(. ' ' .> ~~, ~ ':._C, ~ °" "; '.'..:: ~ 0 ~ .;? ~ < G " C t "' -.\ c; ' 's- ~ \ \, G' U: u (/) ['; • <P y+ ~ 'fl [...i._BAX-BA !11"' j BAX-BB BAXTER PARCEL SOUTH \ \ \ .BAX-)5 \ // \ ' ' I \ I'\ \ \ \ \ \ \ \ \ \ \ \ \ "\ I I /1 /! / -~~--=--==--~7 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ - \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ...i._NBB-1 \ ~ ~ TNBMW-1 \ ~ ~ II '\ LAk[ [J I Ll:.G~ND ... WELLS TO Elc DECOMM!SS!ONEJ -$-COMPLIANCE MCN!TOR,NG WELLS WASHtNcroN ... BAX-10 ... BAX-5 BAXTER PARCEL. NORTH -tNes-2 NBMW-2 ; \ "-., B • R 40 O 80 / SEAHAWKS HEADQUARTERS AND :;:-ETEC r-.•? I PRACTICE FACILITY .{' 1 "=80' VULC1-19589-510 l------~-----~------1--------------------l WELLS TO BE DECOMISSIONED DATE: 10/5/06 ORl',t,J: [.M./SEA FIGURE 4.5 ,, " ,- ' ,, ;:-, 'D ·~ ~ \c:," ,-::, ,_ ::::, "· ,. " ':{ '% ~ :~ f, ' " s "' ,: % ""': ' g ;;. c,. ~ ~ ~ 0 " --H ' I ' ~ ~ ~ ~- W1'\x6J CPI JHIS LINE ' -' Iii ~-;;,tJ~:~·-,· "'e ~ _ __.,9 ... • l---~-- 30·~ DRIL~ED SHAFT : ' WJ:11§2 COi JHIS LINE l,--18"-JD" DP THICKENED EDGE AT PERl~ETER, TYP FON, TYP 1 ·~ Iii -• -[jJ m + ! ITT ITT hliil ~ W14¥99 COi JHIS LINE 171 !JLL.: ~.Llli:l:UJJ' i 11 ii! , .. =i ; = 4 ' ' ~= I 1 TTTTT1TTTTr ' ,., 1!!11 I \!!I = I ! ' --I"" I"" 'l!!J -= co F. FOR p E-E~GINEfRED _ _ _ . I 1 _ • 1_ BL· BY OT ERS, 1'f'E. ! -1 1==-·-1= tj] ~"-~ 11 1_ "'1'~£91 r~UNE ,_ :_ u 1 • . r--n" " n i-" TT TT , -, ", "" " .-.-n TI, " , I " " '" r~ -f I ~ 1 ~ ~ ~ , ll-+r-,-H-_j --u -. . --CJ7 ~ u • ~ ~ • ,_ er--\) , • _ -l-1 ---11-"--- I ! l ~ i ' ' i I ! -I JI l r ... t:, ~i; O;;J,~"«'~ DP ORI ED W 6) ._ AT RACE F f.lE ~ :::n '*1 'rt+---+---I I I 1··· I I I I f-+--1 j I I I -1 · :~ 11 • .,, "f ,,,, ,,,, .,,, ... ,. ,,,, ,,,, ,,,, ,,,!, ,,,,1,,,,1 .. ,,1,,,1,1 .... 1,,,,1.1.,, I · , 1 , 1 mo lR , 111 1ciJL 1ilRF i:111:u ' i i 11 ' 1111 1111 " ' ' ' " ' t 11 I 111 t l I I l:J '*1 Ill-+: I j~· '"' "" 'l'"j'f l""I 11 I i I I Ii I I 1l111 f111l1 I 1111 IJ If I fl 11 Ill 111111:111111 I 111 !I 1'1 ! I t--t--t---'·'*---- $ + KP 0 "1 jr • . u i J-lo I -~c I -ijc I -~o I tJ,o I 4ld· I l'lo-I 2kl· i "' ~ I I .I. ,,I,, .I .I. u, I,, ,,T II' I. 1111:" II;' II':·~" : ' I I I I I I I I I I I 111 I 1111I1~ul11111I1111!1111 I 1:, uJ11.1j1 I 1111 ! 1111 i I ! ~ ~ ,1, ' ' -1-~I~ I + ~ i~ I ! ' I ' __ , :-1- I I I I ~1 ' I I Iii I I = = ---! -\_DR~ED sH>I! ~N I ~ tJ'Jl' I I 11 I I ' -~ ·1 "'1;=1 I ,, ' ~ I i ~ I -I I I I I I I F_IR~T"_ LEVEL / FOUNDATION PLAN ffi N 8 '-._"j SOURCE: SITE DRAWINGS FROM MKA & CRAWFORD NOTE: PILE LOCAllONS AND BRACED FRAME LOCATIONS ARE SUBJECT TO CHANGE AS DETAILED JESIGN PROGRESSES. ~I.RETEC SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULC1-195B9-510 DATE 1 O/~L06 DRWN: E.M.{SEA BUILDING FOUNDATION LOCATION FIGURE 4-6 -·-~ '·-' " c :2 'Q ',.;:, C::o \ ~,· " c., " ,':' 1~ 't, ~ c " " ::; -. ' ~ ~ ~ R -~ t J;' " ::;~ ' i 5; c,; ! j ! ! i I ! i i ' I TOP OF ?J'!m FILTER 23fO SOURCE: " Ii ,' ( i ,, 1; ,-0~~?(__s -y-(~"~ I c, ~ V -----/· i SITE DRAWINGS FROIV MKA & fl.RETEC -"] CF<AWFORO --------....____ /-LIMITS or WORK.~. ------- ~ i ·-\ 50 0 "'-""-"i 1"=100' 100 i - " ? ii l / SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULC1-19589-510 OAT[; 10L5L06 ORWN: E.M.LSEA --------------- TOP OF SAND FILTER 22.00 £ TOP OF BER 23.50 M GB -·-.\ ("-.... .. '._"., \ ---------, TOP or BERM 25.00 TOP or SANO FILTER 2.!.50 ·---., ___ \ \ \ '\ \ \ ' I SITE CUT AND FILL CONTOURS FIGURl;4-7 " ';:, " E:: C '" '\ ~ ,, ~· '-.~ ~ ;f t ~ i C C " :c: " ' ~ ~ " il ~ ~ " " :,j ;,; (3 :g ~ PL, TYP~ ~--~ ~ ~ J _j " '" ~I i' LANDSCAPE cn@•D1 C C2 1 U8GRADE AT FIELD OLLECTOR P1P[S lAN_QSCAP<. C•'\ CE2~@_£4oz TOP OF SAND FILTER 23.50 ~ CE22J CE402 P~ENT ~ ~ -CEnJlCT<OZ /,'' ~fl ,,.u-\.1\! ~- BUILDING SL.A,~ n2w402 FF "' 27.40 25 00 ,)200 27.00 ~~,-{ ~ r~-~(LIMCS ·::~ 2 --~ ~ " ,-,_;, 0 ~<:FWORKNP ,J ~ -~--~ /,'-. J "'~ -------/ ---._ r f x "'-~ ' NATURAL ~TURF FIELD 27.00 C\ CEU~]_t,:•02 27.00 /10~IBro Cf2~402 SU3GRADE AT FIELD COLl£0iR PIPES ,\ er 2.1,1cr•o y . I Tf?C::NCH DRAIN RIM "' 27.DO 27 II .DO 27 j ~fME~l-1 ORAi~ ~j' • 138 TRENUI DRAIN ~a.27.DO ff ~ -"·" 1'1 r L HARDSCAP[ ~' 1 1 -,,,:;J<~S ORSO {Ij '•• -27.20 "''-'l'""' ' ----e::: .. J TOP OF SAND FILTER 23.50 c,.f~,n SOURCE: SITE DRAWINGS FROM MKA & CRAWFORD 27.40 TRENCH DRAIN RIM~= 27.20 LIMITS 0' WORK, 'NP BUILDING SLAB~ CE:i¥J.Ol INDOOR FIELD {?j n2¥•02 FF 27.40 ,w "' TOP OF SAND 'ILTERL'.:D 22.00 CC<?.;;,_Sc•a:i 25 33 TW "23.50 ew m ;?:,,,fl '-2ni 0 Cc 27.41',7 '°I 3'.25 ·-Jr ,;rt.~ 2B 3 --r ~ 1 ~r 1rJ t~ ·t .1 34.ffl,.,. I J4.t7 ~ L\r 2' 5 SEAHAWKS HEADQUARTERS AND ~ ~ RETE( ;_.._: zi-3i 0 / PRACTICE FACILITY I EARLY GRADING PLAN -.'!.: VULC1-19589-510 ~ 1"~100· DATE.10/5/06 DRWN. EM /SEA FIGURE 4-8 ~ ' f ~- ' ::_,. ~" " ---:_~ 0 ' ,\> 't s: "'..~ ~ " ' tj -~ _, ~ ' ' ;'t:' j ~ a C i;- t •, ~ ~ ~ ~ ~ ~ I J MAXI BACKFILL MATERIAL~ INDICATOR It.. GEOT~1~~~ ~ I ' CONCRETE CLASS C ~~ NATIVE ' ~ MA~ERIAL ~ O.D. OF PIPE - ~ I J MAXI ( CLASS A DESIGN) ~I.RETEC f 6" ~ _r±1 A T t ~ I J MAXI M-1 3' !JAX BACK. FILL~ :-AA TE RIAL "" INDICATOR IJ'. GEOTEXTILE ~ I 6" -f- LAYER \,. BEDDING MArERIAL ~ l f'OR RIGID PIPE H--~----B -- NATIVE i MATERIAL A -___L (CLASS B,C,'.l '.lESIGN) BEDDING FOR RIGID PIPE NOTTO SCALE l"IDICATOR GEOTEX-ILE -"' LAYER \, BEDDING MATER'AL FOR FLEXIBLE Pl=iE-~ ~ I J MAXI r:.D OF ~ ~ NATIVE 1/ATERIAL ~ ~ I J MAXI (CLASS F DESIG"I) BEDDING FOR FLEXIBLE PIPE R[D:,1\JG CLA.SS r)ESIGN DIM.~ \JSION CLASS A C Li\.SS 8 CLASS C C '-ASS D C Li',SS F" 5' I/~ A l'/1 -I 6 'AIN. I 5' MS I . ?' I/AX 3 11 /4 0.C '1/2 n D. 1 /8 :) r: I 1j/'i 1.U. 1 / '2 (:, I). 1/R Cl ll.l CITY OF RENTO~ STANDARDS STANDARD PLANS LST DATE: 1 /05 ZERO I 5' Iv!'\ . Z[RO I 0 D. Cl 1; . l 1 'o" t B ----1- A _ __L SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULC1-19589-510 UTILITY TRENCH CONSTRUCTION DETAILS t DATE: 10/5/06 DRWN: E.M./SEA ----FIGURE 4-9 ~ f 0. -c ';) ,, 'D C:.) ~ ;!)" c:..\ "\."':i " } '% ~ t: ,. 6 ·-· " :_~ ~2 ' •· ~ ~ ~' - ~ ~~ c; '~ ;__) ~ 1( :-::~ SOURCE: ,p ! i I i; G :\ :; 'l-\1" ~· -- \ o c-l" 1 ,:,""" '"' -' a / . #GB5 48"-_ _,./ : I SDMH N 198,614.15 · _ E 1,303, 10~.93 RIM = 22.30' IE 24" = 17_77' (SW) IE 24" = 17 7l (NW) EXIST SOMH #GB4 108"- N 198,423.61 E 1,302,970.01 RIM = 26.37' IE 72" = 17.74' (Sl IE 24" = 18.34' (NE \ -;o'.S',0~~~~~~ >}' <o 9°--------------~P o"'!i. "c; "\ . ---...,_ ~');'ll 'l- 'o_d ' (,VQ!( ''.> -,,-\ " ~ ! / '----- /~ I /~- '"' SDMH #GB3 108"- N 198,374.26 E 1,302,977.91 RIM = 27.0' IE 60" = 17.79' (SE) IE 72" = 17.79' (N) SITE DRAWINGS FROM MKA & CRAWFORD !lG·RETEC 30 0 ~-. .S, <. 24"CMp 24"CMp O' S""" "'o s~s\ s"'"oo .ks c•-~, ...,_I ,:;,Y 'Ii' . I ~,c;~· o\i/J...,, ~\.,~~ ... ~- ' I ·?I ,, c;~ ,.,.0 ,o·-· ' I ! SOMH #Ga1 9!"-~ N 198,164 ~ '1,:.f.~ E 1,30.3,450 08 ~ _ - IE 24" = 18 fiM(sl/tx i/ /~~ i_lJ/ IE 54" = 18 .. 35 W) ,~ 24"CP e,<o c· "so - 60 \ 1"=60' SOMH TYPE 3 PER WSDOT STD PU,N B-23C, TYP SOMH #cJB2 95t,,.____J N 198,U9.29 E 1,303,.502.47 RIM = 27.0' IE 54" = 18.2_0' (E) IE 60" = 18.20' (NW) SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULC1-195B9-510 DATE: 10/Ji_06 DRWN E.M./SEA GYPSY SUBBASIN STORM DRAIN RELOCATION PLAN FIGURE 4-10 oo-a: f'II~ Z8:JII' Hf'IOS 09·9z "" f'II~ L8:J, H~OS . 0 l<l ~ ~ 0 u z o-~o we B~ ,. WU l) ' I I ~ ' I I (N,N) OZ"8 l -]I 13) OZ"8 l -]I ZSTZ = 31 OS .ZL (AA) !,£"BL ,. 31 J l3S) l£"8 L '"' 31 ~ !? ~ -• z w :~ _.J 0 -J 0 LL +- N 0 Ct'. ~. (J_ •u ffi > 8 +- ~- 0 or·zz "" "',~ ss:i, Hf'IOS l£"9Z = f'II~ "S:Jit Hf'IOS oo·a = Vil~ £8:Jf Hf'IOS ------3NIJH?1Yi g I I I I I I I 1,-3 {MN) !l"Ll {MS) Ll"Ll ,, . " {MN) KBl "' 31 f-----,-,,---,~I lSJ "l" L \ "' ]I f-----'-----~--,1 {N) 6l" lL = 31 l3S; 6l"O -31 8 +-• 8 +- ~ 8 +-• 8 +- ~ 0 0 +-• -• z w 's~ _.J Ou Li: '-g 0, ~ ~,, I I 0 O:'. 0 LL 5 <( O:'. u ~ <( '<' 2 2 0 O:'. Li__ VJ 0 z 5 <( O:'. 0 w f--- VJ .. w u O:'. :::i 0 VJ 0 z <( Cl) ffi ~ I--Cl'. cc! != <( u ~ ::, <( d, ~ 0 u. ~ Ow ~ <( u 0 w-~i ~ ::, > ~ Q. <( I <( w Cl) u LI.I I- LI.I a::: • ~ ~ .. w c,: ::, S! u. - t- ~ w ~ ' ~ w z • " 0 t- w 0 " ~ " 0 - ~ 0 5 Construction Quality Assurance This section discusses construction quality assurance for the project, including the quality assurance structure, responsibilities, and requirements. Quality assurance includes compliance with health and safety requirements and performance standards outlined herein and within the specifications. 5.1 Quality Assurance Monitoring Structure Figure 5-1 provides an organization chart for quality assurance implementation environmental capping and monitoring activities. An Engineer will be on site throughout construction and will be responsible for ensuring compliance with the performance standards outlined in Section 5.2.2. Upon completion of remedial activities, the Engineer will submit a final completion report. The report will include as-built drawings, work accomplished, materials used, inspections and tests conducted, results of inspections and tests, nature of defects found (if any), and corrective actions taken. 5.2 Construction Quality Requirements 5.2.1 Health and Safety All Contractors and subcontractors are required to use workers trained for hazardous waste work. It is the remedial contractor's responsibility to meet all the requirements of WAC 296-155, Safety Standards for Construction, and the applicable provisions of the hazardous waste operations regulations, WAC 296-62, Part P and 29 CFR 1910.120. The Contractor shall also have a site health and safety (H&S) officer who will ensure that all contractor personnel adhere to H&S regulations. Prior to starting work, the Contractor shall submit a H&S plan to the Engineer for review. The· plan shall include written documentation of employee training and medical certifications as required under WAC 296-62, Part P. Documentation of the following items is required for each site worker where work falls under the requirements of WAC 296-62, Part P: • Initial 40-hour health and safety training and annual 8-hour refresher training • Eight-hour supervisory training, required for the field supervisor • Medical clearance from a licensed physician certifying that the worker is fit to participate in field activities and use personal protective equipment • Current respirator fit test certification VULCJ-19589-510 5-1 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington 5.2.2 • Current CPR and first aid certification for at least one member of each crew • Provision of personal protective equipment for each worker at the highest level of protection for this site (Level D). Performance Standards Performance standards address envirornnental and public health issues, such as emission control, and compliance with envirornnental regulations. Monitoring efforts of the Engineer will be conducted to ensure compliance with performance standards. The following sections identify performance standards for activities at the site. Table 5-1 lists the performance standards and testing requirements that will be applicable during the environmental capping that will be performed in conjunction with Site activities. Discharge to the Sanitary Sewer During construction stormwater will be discharged to the sanitary sewer under the discharge criteria of the King County Sewer Discharge Permit provided in Appendix C. Any stormwater discharging to Lake Washington during construction will be incidental. Each week or within 24 hours following a rain event, during construction, the BMPs will be inspected and the stormwater will be sampled for settleable solids, arsenic, copper, m-cresol, o-creosol, p- cresol, pentachlorophenol, and naphthalene. In addition the maximum discharge rate will be monitored, as well as the daily (24-hour) flow. The inspection and sampling activities will be conducted as outlined in the Stormwater Pollution Prevention Plan included as Appendix C. Emission Controls Excavation, grading, and capping activities will be carried out in a manner that minimizes emissions of odors and dust (fugitive emissions). The Contractor shall provide measures to suppress fugitive dust generated during site grading that the Engineer deems excessive based on visual criteria. The Engineer will monitor the on-site activities to ensure compliance with these standards and regulations. Stockpiles will be covered to the extent practicable to further minimize dust during construction. Water trucks will be used to control site dust. Off-Site Shipment of Impacted Material The Contractor shall coordinate with the waste disposal facility selected for the project and meet the requirements for loading and transporting the impacted materials from the site. The Contractor shall prepare and load all the trucks and containers for transport to the approved disposal facility in accordance with all the applicable local, state and federal regulations. The VULCJ-19589-510 5-2 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Contractor shall inspect and decontaminate all the trucks prior to leaving the site and prevent tracking of materials on public rights-of-way. The load weight shall be documented by the off-site disposal facility scale weight ticket and a copy of the weight ticket shall be submitted to the Site Engineer or Owner (Football NW). Material Specifications Import structural fill shall consist of a reasonably well-graded mixture of sand and gravel that is free of organics, debris, rubbish, and other deleterious material. Structural fill material shall not contain more than 15 percent fines (material passing the No. 200 mesh sieve, based on the minus %-inch fraction); the fines should be non-plastic; and the moisture content of the soil within plus or minus 2 percent of its optimum at the time of compaction. All structural fill shall have a maximum particle size of 3 inches. Gravel for the capillary break layer shall consist of washed rounded or angular gravel, uniformly graded and have a maximum size of% inch and less than 3 percent fines passing the No. 200 sieve. The base course and granular subbase for exterior concrete slabs and asphalt pavement shall be non-frost-susceptible and contain not more than 7 percent fines (material finer than a No. 200 U.S standard sieve). Subbase material shall meet the gradation requirements of WSDOT Standard Specification 9- 03.14(1 ), Gravel Borrow. Base course under pavement shall consist of clean, pit-run sand and gravel; well-graded crushed rock; or a blend of commercial rock products conforming to the WSDOT specifications for Crushed Surfacing, Specification 9-03.9(3). Class B asphalt for pavement shall meet the requirements described in the WSDOT 2006 Standard Specifications (Section 9-02.1 and 9-02.4). The base course sand for natural turf field shall consist of granular pit run or screened material and shall meet the following specifications. Sieve Size Percent Passino No. 318" 100 No.4 75-100 No. 100 0-10 No. 200 /wet sieve\ 0-5 No. 270 (wet sievel 0-2 Note: All percentages are by weight. The root zone sand layer for natural turf field shall consist of 90 percent sand and 10 percent compost with the following gradation requirement. Sieve Size Percent Passino No.4 100 No. 16 85-100 No.30 50-70 VULCJ-19589-5/0 5-3 DRAFT Engineering Design Report, Sea hawks Training F aci/ity-North and South Baxter Properties Renton, Washington 5.2.3 Sieve Size Percent Passina No, 100 3-10 No. 200 (wet sieve\ 0-2 No. 270 (wet sieve) 0-1 Note: All percentages are by weight. Seed bed or rooting medium sand shall consist of free-draining sand that meets or exceeds the requirements for either root zone sand specifications mentioned above or USGA specification for top dressing sand. Seed used shall be a blend of approved perennial ryegrass varieties and Kentucky bluegrass. Seed certification shall include no more than 0.5 percent weed seed. For Synthetic turf fields, the base course shall consist of well-graded crushed rock or a blend of commercial rock products conforming to the WSDOT specifications for Crushed Surfacing, Specification 9-03.9(3), Only coarser fraction of this material retained on U.S. No, 40 sieve size shall be used for the base course, If there is a requirement for top course to be used in addition to the base course, the specifications of the material will be similar to the base course material with the exception the top course will comprise of 5/8 inch minus material instead of 1 V. inch minus material used for base course. Asphalt layer for the synthetic turf fields shall meet the requirements of WSDOT 2006 Standard Specifications Section 9-03.8(6), Aggregates shall meet the following requirements for grading: Sieve Size Percent Passing o/. in square 100 · 1/2 in square 90 -100 3/8 in square 75 -90 1 /4 in square 55-75 U.S. No. 10 30-42 U,S, No, 40 11 -24 U.S, No, 200 3.0 -7.0 Percent Asphalt Cement of the total mixture shall be 2.5 to 4.5. All percentages are by weight, Record Keeping and Reporting The Engineer will maintain records to document the work performed, These records include, but are not limited to, the following: • Daily Activity Log, A daily activity log will be completed to describe general site activity and personnel working on site, The records may be used to substantiate invoices as related to measurement and payment of site work. H&S levels will also be noted in the daily logs as well as field H&S monitoring, VULC/-19589-510 5-4 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington • Material Testing Results. All material testing results will be maintained. Material testing logs will, at a minimum, include the date and time of testing, testing site and location, identification of tester and company, test results, and any relevant comments. VULCl-19589-510 5-5 DRAFT Engineering Design Report -Seahawks dquarters and Practice Facility-North and South Baxter Properties, Re _ ,, Washington Table 5-1 Performance Standards for Remedial Activities during Redevelopment Standards Parameter Level of Performance Testing Method Frequency of Comments or Specification Testing Preconstruction Testing Import Soil Fill Soil Reasonably well-graded ASTM D-422 For each source Contractor to submit soil Classification/Gradation mixture of sand and gravel free sample for approval of organics, debris, rubbish and other deleterious material, consisting no more than 15 percent fines (material passing the No. 200 mesh sieve, based on the minus Y.-inch fraction); the fines should be non-plastic; and the moisture content of the soil within plus or minus 2 percent of its optimum at the time of compaction. All structural fill shall have a maximum particle size of 3 inches. Import Base and Gradation Subbase material shall meet ASTM D-422 For each source Contractor to submit Subbase Material for the gradation requirements of subbase and base course asphalt pavement and WSDOT Standard sample for approval Concrete Slab Specification 9-03.14(1 ), Gravel Borrow. Base course material shall conform to the WSDOT specifications for Crushed Surfacing, Specification 9-03.9(3). VULCJ-19589-510 5-6 DRAF ___ gineering Design Report, Seahawks Training Facility-North and South _ _xter Properties Renton, Washington Standards Parameter Level of Performance Testing Method Frequency of Comments or Specification Testing Base Course Sand for Gradation Sieve Size % Passing ASTM D-422 For each source Contractor to submit sample Natural Turf Field for approval No. 3/8" 100 No.4 75 -100 No. 100 0-10 No. 200 0-5 No. 270 0-2 Root Zone Sand for Gradation Sieve Size % Passing ASTM D-422 For each source Contractor to submit sample Natural Turf Field for approval No.4 100 No. 18 85 -100 No. 30 50-70 No. 100 3-10 No. 200 0-2 No. 270 0-1 Capillary Break Layer Gradation Uniformly graded, washed ASTM D-422 For each source Contractor to submit sample rounded or angular gravel, for approval max size 'Y. inches with less than 3 percent fines passing No. 200 sieve. Base course for Gradation Base course material shall ASTM D-422 For each source Contractor to submit sample Synthetic Field conform to the WSDOT for approval specifications for Crushed Surfacing, Specification 9-03.9(3). VULCJ-19589-510 5-7 DRAF _ineering Design Report, Seahawks Training Facility-North and South ter Properties Renton, Washington Standards Parameter Level of Performance Testing Method Frequency of Comments or Specification Testing Aggregate for Gradation Sieve Size % Passing ASTM D-422 For each source Contractor to submit sample Synthetic Field Asphalt for approval Pavement % in square 100 Y. in square 90 -100 3/8 in square 75-90 Y. in square 55-75 No. 10 30-40 No.40 11 -24 No. 200 3.0-7.0 Asphalt Cement Mix: 2.5 percent to 4.5 percent Construction Testing Final Grading As-built Survey Within 1 inch Field Surveying Continuous Contractor to submit final Industry as-built survey Standards Monitor Discharge to Turbidity No excessive turbidity SM 2130 or EPA At least once Contractor responsible for Metro Sewer 180.10 per week testing Asphalt Pavement Compaction Base course layer and Modified Proctor At least 1 per Minimum impacts to Lake subbase course layer Compaction Test 10,000 SF expected. Contractor compacted to at least 95 (ASTM D 1557) responsible for testing. percent of max dry density Capillary Break Layer Compaction Compact to dense unyielding Visual Continuous condition with at least 3 passes of vibrating plate compactor or smooth-drum roller Base Course Granular Compaction Base course layer compacted Modified Proctor At least 1 per Contraclor responsible for Material for Natural to at least 95 percent of max Compaction Test 10,000 SF testing Fields dry density (ASTM D 1557) VULCl-19589-5 IO 5-8 Standards Parameter Base course for Compaction Synthetic Field Emission Controls Dust DRAFT ~ineering Design Report, Sea hawks Training Facility-North and South . ter Properties Renton, Washington Level of Performance Testing Method Frequency of Comments or Specification Testing Base course layer compacted Modified Proctor At least 1 per Contractor responsible for to at least 95 percent of max Compaction Test 10,000 SF testing dry density (ASTM D 1557) No excessive emissions Visual Continuous Contractor shall provide dust suppression measures VULCI-19589-510 5-9 DRAFT Engineering Design Report -Seahawks Headquarters and Practice Facility-North and South Baxter Properties, Renton, Washington Figure 5-1 Quality Control Organization Chart RETEC MKA Shannon & Wilson Environmental Consultant Civil Engineer Geotech Engineer Project Manager Project Manager Project Manager .. RETEC MKA Shannon & Wilson Construction Manager Construction Manager Construction Manager Bayley General Contractor l Work Crews Surveyors Quality Control Testing Subcontractor VULCl-19589-510 5-10 6 Long-Term Monitoring 6.1 Compliance Groundwater Monitoring The compliance groundwater monitoring program was initiated in 2005 upon completion of uplands remediation at the South Baxter Property. Compliance monitoring is required under WAC 173-340-410 to confirm the long-term effectiveness of the remedial action completed at the South Baxter Site. Four quarterly sampling events have been completed to date that indicates groundwater complies with cleanup standards. Compliance groundwater monitoring will continue to be implemented at the site as specified in the CAP. The groundwater compliance monitoring requirements, as described in the CAP consist of a monitoring network of five monitoring wells: BAX-8A, BAX-8B, BAX-6S, BAX-6D and BAX-15. The wells allow for monitoring of groundwater quality along the shoreline of Lake Washington. The monitoring schedule requires a total of 30 years of monitoring if there are no exceedances in the wells. The schedule includes the following: • One year of quarterly monitoring ( completed) • Two years of semi-annual monitoring (2006 and 2007) • Two years of annual sampling (2008 and 2009) • Twenty-five years of sampling at a frequency of 1 event every 5 years (2014, 2019, 2024, 2029, 2034). At any time during the monitoring, if an exceedance of cleanup level is observed in a shoreline well, confirmation sampling is required to be performed within 60 days of the original sampling. If the concentrations decrease below cleanup levels, the original monitoring schedule is resumed. If, after the first year of monitoring, the confirmation sampling confirms the exceedance, a contingent remedy is required to be implemented based on consultations with Ecology. During each groundwater sampling event, the five compliance monitoring wells will be sampled for total PAH and PCP, as analyzed by EPA Method 8270 SrM. Groundwater sampling will be performed using low-flow sampling techniques and field samples will be filtered as required in the CAP. All wells will also be gauged to determine the groundwater level. The samples will be submitted to a certified analytical laboratory for analysis. A sununary report will be prepared for each groundwater sampling event and submitted to Ecology. Data will be evaluated to ascertain trends in groundwater concentrations, determine whether cleanup levels are continuing to be met, and whether modifications to the monitoring schedule are necessary. VULCI-19589-510 6-1 DRAFT Engineering Design Report, Seahawks Training Facility -North and South Baxter Properties Renton, Washington 6.2 Cap Inspection and Maintenance Form 6.2.1 Cap Inspection and Maintenance Plan This plan details the inspection and maintenance (l&M) requirements for environmental caps at the Football NW North and South Baxter properties, Construction of a final cap can be categorized as five different types of caps, The five types of caps to be constructed are: • Field Cap: This cap consists of the three outdoor natural turf practice fields and one outdoor and one indoor artificial turf practice fields • Concrete Slab Cap: This cap consists of the concrete structural slab of the office building, concrete slab and concrete sidewalk • Asphalt Pavement Cap: This cap consists of areas that include pedestrian access, surface parking and roadways • Landscape Cap: This cap consists of areas used for planting beds, sand filters, bioretention swales and hardscape areas • Membrane Cap: This cap consists of utility easement area and other areas along the eastern edge of the property boundary The area covered by this I&M plan is shown on Figure 6-L The purpose of this I&M plan is to ensure future maintenance of the cap in a manner that complies with all of the objectives of the cap, 6.2.2 Cap Inspection and Maintenance Requirements I&M requirements for each cap type include cap inspections and cap maintenance consistent with the form Restrictive Covenants required by the CD based upon inspection results, each of which is discussed below, Cap Inspections The various caps will be visually inspected by Football NW. Surface conditions and conditions along structures are the two main components of the cap that will be visually inspected, The surface will be inspected for cracking, damage, settlement, and standing water. It will be assumed that if the top surface of the cap is in acceptable condition, then the underlying layers of pavement are also in acceptable condition. From these visual inspections, the integrity of the cap can be determined, and any areas where maintenance is required can be identified, VULC/-19589-510 6--2 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Cap inspections examine how various site activities affect the integrity of the cap. Inspected areas and associated information will be noted on the cap inspection log provided in Figure 6-2. Field Cap, Membrane Cap and Landscaping Cap Inspection The soil cover will be visually inspected by Football NW maintenance staff weekly, or following any activities that disturb the cover. Any indication of soil disturbance or settlement such that ponding occurs will be further investigated. Any indication of soil erosion such that the indicator fabric being exposed will also be investigated. Inspected areas and associated information will be noted on the inspection log provided on Figure 6-2. Visual inspection of the soil cover will also be preformed annually by an environmental professional. Asphalt Pavement Cap and Concrete Cap Inspection Cap inspections examine how various activities affect the integrity of the cap. Each cap will be visually inspected by Football NW armually and following any site construction activities that require removal and replacement of the cap consistent with the form Restrictive Covenants required by the CD. Following the maintenance and repairs on the cap, inspections of the repaired areas will also be performed annually. Conditions that may develop include settlement of sections of the cap, water ponding on the cap surface, cracking, or potholes that develop in the cap, or any damage reported by the property owner. A minimum of every five years, Football NW will individually evaluate the need to resurface the asphalt cap consistent with Restrictive Covenant requirements. Any resurfacing activities deemed necessary would be implemented as appropriate pursuant to the form Restrictive Covenants required by the CD based on the results of the five year evaluation. 6.2.3 Cap Maintenance The caps will separate site users from the chemicals of concern present in surficial soil, and will either contain a physical barrier layer (30-mil geomembrane) or indicator fabric at the interface between native soil and imported crushed rock base. The identifier layer will be placed over the existing surficial soil before placement of the crushed rock base. The identifier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the crushed rock base. Based upon inspection results, any potential damage, settling, or separation will be evaluated to determine if the item can be addressed by performing maintenance or repair to the cap consistent with form Restrictive Covenant VULCJ-19589-5/0 6-3 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington requirements. The results of the inspection will be documented and a field sketch prepared identifying any areas of concern. Table 6-1 presents the types of cap conditions that may develop over time and the maintenance or repair required. Conditions that may develop include settlement of the cap, water ponding on the capped surfaces, potholes that develop in the asphalt, cracks developing in the concrete building section cap, or erosion of the landscape and natural turf field topsoil, or any other damage noted by the Football NW. 6.2.4 Asphalt Pavement, Artificial Turf Field, and Concrete Slab Cap Maintenance Surface Patching In accordance with the form Restrictive Covenant requirements, pavement, artificial turf field and building section cap maintenance will be performed. Areas of settlement less than 3 inches deep will be patched. Surface patching will include brushing the area clean and placing standard asphalt or concrete to restore the settled area back to original grade. Standard asphalt or concrete patching will be placed in accordance with current WSDOT standard specifications. In addition the Synthetic Turf Field Section Cap will need replacement of the synthetic surfacing following any surface patching repair. Removal/Replacement of Subgrade and Asphalt Areas with settlement greater than 3 inches deep over short distances will require removal/replacement of asphalt or concrete and base course. Removal/ replacement will include removing the existing asphalt cap and removing the base course to a depth of 7 inches below existing grade. Base course and asphalt cap will then be replaced to meet original contract specifications. Asphalt or concrete repair will be performed by identifying the extent of the failed area. The asphalt or concrete will be saw-cut 2 feet beyond the failed area perimeter and the full depth of asphalt and base course will be removed. The subgrade will be inspected by proof rolling for deflection and recompacted and/or replaced if necessary. The existing edges will be cleaned and tacking agent applied. Crushed Stone Base Coarse (CSBC) will be placed and compacted with a mechanical hand tamper, as necessary. Existing CSBC may provide a suitable base course. WSDOT Class B asphalt pavement will be placed in a minimum 3-inch lift to match the thickness of the surrounding pavement and will be VULC/-/9589-510 6-4 DRAFT Engineering Design Report, Seahawks Training Facility -North and South Baxter Properties Renton, Washington compacted in accordance with current WSDOT specifications. PCCP will be placed in a minimum 3-inch lift. In addition the Synthetic Turf Field Section Cap will need replacement of the synthetic surfacing following any removal or repair of the subgrade and asphalt. 6.2.5 Natural Turf Field, Membrane Cap and Landscaping Cap Maintenance Replacement of Topsoil Pursuant to the form Restrictive Covenant requirements, maintenance of the natural turf field section and landscape section cap will be performed. Based upon inspection results, areas of damage will be evaluated to determine proper repair. Areas where erosion has occurred or where the geomernbrane or indicator fabric is exposed may require replacement of the soil cover. Replacement will include placement of additional soil to the required cover thickness above the geomembrane or indicator fabric, and seeding and/or revegetating the affected area. Material specifications are provided in this EDR. Areas with settlement greater than 3 inches deep will require replacement of topsoil to achieve the full depth as described in this EDR. Repair will be performed and materials supplied in accordance with the contract specifications. 6.2.6 Documentation and Reporting 6.2.7 Football NW will document cap conditions and relevant observations noted during each inspection. At a minimum, each inspection event will require that a log be completed (Figure 6-2). Reports documenting cap inspections, maintenance, and repair will be submitted to Ecology annually for those instances where Ecology pre-approval is not required. Annual reports will consist of inspection forms and any documentation of maintenance and/or repair. Cap repair or maintenance reports based on a specific inspection event will be filed together as a packet with the inspection forms themselves. Documentation regarding all cap inspections and cap maintenance activities performed will be maintained by the Football NW. Inspection and Maintenance Summary A summary of inspection and maintenance requirements is provided in Table 6-2. VULCl-/9589-5/0 6-5 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington 6.3 Soil Management Plan The Soil Management Plan (SMP) addresses procedures associated with post- site-development penetration of the environmental cap and excavation of contaminated soil located below the environmental cap and the indicator layer. These SMP procedures include health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options at the Site as specified in the CAPs and form Restrictive Covenants (April 4, 2000). In accordance with these documents, soil must be handled and managed in a manner that is protective of human health and the environment. Site maintenance staff and contractors shall follow the procedures outlined in this document during maintenance and construction activities at the Sites. The Soil Management Plan is included as Appendix J. VULCJ-19589-510 6-6 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Table 6-1 Cap Conditions Cap Type Potential Cap Maintenance or Repair Required Conditions Natural Turf Field, Surface Erosion Placement of additional soil, replacement of Landscape and and geomembrane or soil indicator fabric, seeding or Membrane Cap Settlement revegetating the affected area. Artificial Turf Field Pot Holes, Areas of settlement less than 3 inches deep will be and Settlement, and surface patched to restore the settled area to Asphalt Pavement Water Ponding original grade. Areas with settlement greater than 3 inches deep will require removal/replacement of asphalt and base course. The synthetic turf field will require replacement of the synthetic surfacing following any removal or repair of subgrade and asphalt. Concrete Slab Settlement Areas of settlement less than 3 inches deep will be surface patched to restore the settled area to original grade. Areas with settlement greater than 3 inches deep will require removal/replacement of concrete slab and base course. VULCJ-19589-5/0 6-7 DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Table 6-2 Summary of Inspection and Maintenance Requirements Item Requirement Due Routine Activities: Routine Inspection Inspect Cap Surface Annually Routine Notification Notify Ecology of Completed 1/M Annually Activities Routine Resurface Evaluation Evaluate Need to Resurface Cap Every 5 Years Construction Related Activities: Post-Maintenance or Inspect Cap Surface Following Cap As Required Repair Inspection Repair Post-Construction Inspection Inspect Cap Surface Following Cap As Required Construction Activities Site Improvement Notification Notify Ecology Prior to Cap-Affected As Required Site Improvements Soil Handling/Disposal Obtain Ecology Approval Prior to As Required Handling/Disposal of Cap-Related Contaminated Soils Cap Repair Repair Cap as Needed Based on As Required Inspection Cap Resurfacing Resurface Cap as Needed Based on As Required 5-Year Review VULCJ-19589-510 6-8 ~EQEl'-;0 NATURAL TJRF F =rn CAP I ' • I CONCRETE SlAB CAP ~ l--:::~ ,::-, ~ :::~ .,-: " ;_":; c ~ -~3 -<: ,. a " ~ c ·" .. •c t, ,2:) ~ 2 -~ SAND FILTER -------: ----~------- /~:;ft:~ f.----------------~- ---- ~--~--~-----1 i r---c l t=--'---~=l I __ J i ~i 11 11 , I 1 ___ ::; f---~--~--- I~ o ~ o d ARTIFICIAL TURF FiELJ CAP K22Z8 -....,._., ~,:. -----....: STRUCTURAL CONCRETE SLAB CAP ASPHAL' PAVEMENT CAP 50 FEET SETBACK FILTER -.::> ·f- t-r-- F ,r:: ·-·--.. -- /}HICKE~PHAL ~~--.. ··-····· -~/THICKER ASPHALT __ •' -- .... ~ r -------------------1 ~ · . :;1;,.,;'l.~1.~--:;-~;,: _ ~''?'"' , . 1:,· ... · 11 1 :-:· .. · .-.•. • .. ~1n1m1mrrmrr11111nTITT1fTR'~ . . ' ·:::,';\ , . . . .•. . , . . ., . . . {I ,~l~Tfm11tE ~·111111111111H1111111111111e1 ~ "I ./ ~--~-~ ~ ~ " -...,;:;_. )( ii< ---=-."(--=---e.-- -~~ "' "• cc, -r, 2: SAND FILTER SOURCE SITE DRAWINGS FROM MKA & CRAWFORD Vl!/1/!!;1 G' ··;:,,,.. • - RUBBERIZED MAT OVFR CONCRETE LANDSCAPE CAP MEMBRANE CAP GRASSCRFTE/GRASSPAVE =-fl f,1 SAND FILTER PUBLIC !ACCESS PAVEMENT SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY VULC1-19589-510 ! L1:-:7:~:...:R.::E:T.:..:E::(:._ ________________________ 5 _~ __ -_-_-_ 0 ,~ .. :.~ 1~0~0· ___ 1 _ 0 _ 0 _.:/:_ ____ fo~,n:~,~1 D;L/;::s/:£;D'~-.Lo;::aw:::":..!' '~·"!L./1!SEA:!..__j_ ____ .....l _________ _..:F..:;IG::,:U::.:R.!:E::..;6::..;·.:.1 __ _. I & M PLAN AREA DRAFT Engineering Design Report, Seahawks Training Facility-North and South Baxter Properties Renton, Washington Figure 6-2 Sample Cap Inspection Log Date of Inspection: -------Name of Inspector: --------- Weather Conditions: Time of Inspection: ______ _ --------- Overall Cap Inspection Cap Damage -Location and Description ______________ _ 1) Asphalt Pavement and Concrete Slab Cap Surface Conditions ----------------------- Are cracks greater than 'I. inch wide visible? ------- -Width of cracks -Depth of cracks -Length of cracks -Spacing of cracks _______ _ -Location of cracks -------- Is Settlement Visible? -------- Is settlement greater or less then 3 inches? ______ _ -Dimension of settlement area ------------Depth of settlement _____________ _ -Location of cracks --------------------- Notes: ----------------------------- 2) Natural and Artificial Turf Field Surface Conditions ----------------------- Cap Damage -Location and Description--------------- Notes: ----------------------------- VULCJ-19589-510 6-10 DRAFT Engineering Design Report, Seahawks Training Facility-Nonh and South Baxter Properties Renton, Washington 3) Landscape and Membrane Cap Surface Conditions ------------------------- Are there signs of surface erosion? _________________ _ Cap Damage -Location and Description ______________ _ Notes: ------------------------------- Follow-up Instructions of Repaired Areas Location ------------------------------ Notes: ------------------------------- VULCl-19589-510 6-11 7 References King County, 2005. Surface Water Design Manual, King County, Washington. Department of Natural Resources and Parks. January 24. Shannon and Wilson, 2006. Geotechnical Report, Seahawks Headquarters and Practice Facility, Renton, Washington. Prepared for Football Northwest, LLC. September 13. The RETEC Group, Inc. (RETEC), 2002. Engineering Design Report: J.H. Baxter South Property. Prepared for Port Quendall Company, May 2002. RETEC, 2005. Construction Completion Report: J.H. Baxter South Property. Prepared for Port Quendall Company, March 2005. ThermoRetec Consulting Corporation (ThermoRetec ), 2000a. Feasibility Study: J.H. Baxter South Property. Prepared for Port Quendall Company, April 2000. ThermoRetec, 2000b. Cleanup Action Plan: J.H. Baxter South Property. Prepared for Port Quendall Company, April 2000. ThermoRetec, 2000c. Feasibility Study and Cleanup Action Plan: J.H. Baxter North Property. Prepared for Port Quendall Company, April 2000. Woodward-Clyde Consultants, 1990. Draft Remedial Investigation Report, J.H. Baxter, Renton, Washington. Prepared for J.H. Baxter Company. December 1990. VULCJ-19589-510 7-1 Appendix A Consent Decree EX?04 RECEIVED 1, King Counly Superior Gour! c1,1n Ollitt MAY 1 8 2000 Cashier Section KNT Superior Court Clerk 2 3 4 5 6 7 IN THE SUPER10R COURT OF THE STATE OF WASHINGTON IN AND FOR KING COUNTY 8 STATEOFWASHINGTONDEPARTMENTOF 9 10 11 ECOLOGY, v. Plaintiff, PORT QUENDALL COMP ANY, a Washington 12 corporation, 13 14 15 16 17 18 19 20 21 22 23 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE Nonh · Baxter Defendant. rO.O-2 -1177 8 -7KNT PROSPECTIVE PURCHASER CONSENT DECREE RE: NORTH J.H. BAXTER · PROPERTY/RENTON ATTORNEY GENERAL OF WASHINGTON Ecology Division PO Box 40I 17 Olympia, WA 98504..0117 FAX (360) 438-7743 TABLE OF CONTENTS 2 Page 3 INTRODUCTION .................................................................................................................................. ! 4 I. AUTIIORITY, JURISDICTION, AND VENUE ....... , .................................................................... .3 5 II. DEFINITIONS ......................................................................................................... : ....................... .4 6 III. DESCRIPTION OF FACILITY CONDITIONS .............................................................................. 5 7 IV. DESCRIPTION OF PROPOSED PROJECT .................................................................................. 7 8 V. WORK TO BE PERFORMED ......................................................................................................... 8 9 VI. ECOLOGY COSTS ......................................................................................................................... 9 10 VII. DESIGNATED PROJECT COORDINATORS ............................................................................. 9 11 VIII. PERFORMANCE ....................................................................................................................... 10 12 IX. CERTIFICATIONS ....................................................................................................................... 11 13 X. PARTIES BOUND; CONVEYANCE OF PROPERTY ................................................................ 11 14 XI. AMENDMENT OF CONSENT DECREE; ADDING NEW PARTIES TO DECREE ............. 12 15 XII. DISPUTE RESOLUTION ................................ ; ........................................................................... 13 16 XIII. CONTRIBUTION PROTECTION ............................................................................................. 14 17 XIV. COVENANT NOT TO SUE; REOPENERS ............................................................................. 15 18 XV. RESERVATION OF RlGHTS ..................................................................................................... 16 19 XVI. DISCLAIMER ............................................... , ............................................................................ 16 20 XVII. RETENTION OF RECORDS ................................................................................................... 16 21 XVIII. PROPERTY ACCESS ............................................................................................................. 17 22 XIX. COMPLIANCE WITH OTHER APPLICABLE LAWS ............................................................ 17 23 XX. SAMPLING, DATAREPORTING,AND AVAILABILITY ..................................................... 18 24 XXL PROGRESS REPORTS .............................................................................................................. 19 25 XXII. EXTENSION OF SCHEDULE ................................................................................................. 20 26 XXIII. ENDANGERMENT ...................................................................................................... , .......... 21 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter -------------··· AITORNEYGENERA!.OFWASHlNGTON Ecology Division PO Box 40.117 Olympia, WA 98S04-0117 FAX (360) 438-1743 XXN. CERTIFICATION OF COMPLETION AND DELISTING .................................................... 22 2 XXV. INDEMNIFICATION AND HOLD HARMLESS ................................................................... 22 3 XX.VI. CLAIMS AGAINST THE STATE .......................................................................................... 23 4 XXVJI. PUBLIC PARTICIPATION ................................................................................................... 23 5 XX.VIII. DURATION OF DECREE AND RETENTION OF mRISDICTION ................................. 23 6 XX.IX. PUBLIC NOTICE AND WITHDRAWAL OF CONSENT .................................................... 24 7 XXX. SEVERABILITY ....................................................................................................................... 24 8 XXXI. EFFECTIVE DATE .......... , ...................................................................................................... 24 9 ATTACHMENT A-Description of Property IO A TT ACI-™ENT B -Feasibility Study/Cleanup Action Plan 11 ATTACHMENT C -Restrictive Covenant 12 ATTACHMENT 0-Site Map.of Property to be Acquired by Port Quendall Company 13 ATTACI-™ENT E-Form Notice of Proposed Successors in Interest and Assigns 14 ATTACHMENT F -Form Agreement of Successors in Interest and Assigns 15 ATTACHMENT G -Public Participation Plan 16 ATTACHMENT H-SEPA Determination ofNonsignificance and Environmental Cneck.list 17 18 19 20 21 22 23 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 11 ATTORNEY GENERAL OF WASHINGTON Ecology Division P0Sox40ll7 Olympia, WA 98504..0117 FAX (360) 438-7743 1 2 3 4 5 6 7 8 9 10 11 12 13 ) 14 15 16 17 18 19 20 21 22 23 24 25 26 INTRODUCTION This Prospective Purchaser Consent Decree ("Decree") is made and entered into by and between the Washington State Department of Ecology ("Ecology") and Port Quendall Company, a Washington corporation ("PQC"). Qualified Successors in Interest and Assigns may become parties to this Decree as provided in .Section XI. I. WHEREAS, the purpose of this Decree is to; (I) resolve the potential liability of Defendant for the present contamination arising out of past activities associated with the Facility, including the contamination associated with the ''North Baxter Property" described in Section III and Attachment A herein, and has thereafter been deposited, stored, disposed of, placed, or otherwise come to be located within the Facility; (2) promote the public interest by expediting cleanup activities at the Facility; and (3) facilitate the reuse of a currently vacant parcel of land. 2. WHEREAS, the Nqrth Baxter Property currently is owned by J. H. Baxter & Co., a California limited partnership ("J. H. Baxter''). 3. WHEREAS, the Facility will be listed on the Washington Hazardous Sites List. 4. WHEREAS, PQC has entered into a Property Purchase Agreement with J. H. Baxter to purchase the North Baxter Property which is comprised of one parcel totaling approximately 12 acres and is described on Attachment A. 5. WHEREAS, final entry of this Consent Decree is a condition of the Property Purchase Agreement necessary in order for the purchase to close. 6. WHEREAS, Defendant proposes to facilitate construction of mixed commercial, residential, and/or retail development on the North Baxter Property by performing remedial actions as more fully described in Attachment B (Feasibility Study/Cleanup Action Plan). 7. WHEREAS, Defendant is simultaneously entering into a Consent Decree with respect to the purchase of property immediately south of the Facility (the "South Baxter Property"). The South Baxter Property is also owned by J .H. Baxter and has in the past operated in conjunction with PROSPECTIVE PURCHASER CONSENT DECREE North Baxter I ATTORNEY GENERAL Of WASHINGTON Ecology Division PO Box 40117 Olympia, WA 98504-0117 FAX (360) 438•7743 the Facility. Ecology has determined that the South Baxter Property is a separate facility and is thus 2 addressed in a separate Consent Decree. 3 8. WHEREAS, in the absence of this Decree, at the time it acquires the North Baxter 4 Property, PQC would incur potential liability at the Facility to the state of Washington and/or third 5 parties under the Model Toxics Control Act ("MTCA"), Chapter 70.105D RCW, as an· 6 owner/operator due to releases or threatened releases of Hazardous Substances, Pollutants, or 7 Contaminants at the Facility. 8 9. WHEREAS, Ecology does not intend to provide a defense to Defendant to any 9 liability for releases or threatened releases of Hazardous Substances caused or contributed to by IO Defendant. 11 10. WHEREAS, this Decree promotes the public interest by facilitating use of the North 12 Baxter Property. 13 1 I. WHEREAS, Defendant has offered to further certain Ecology goals as provided in 14 this Decree in exchange for a covenant not to sue and protection from contribution for contamination 15 at the Facility. 16 12. WHEREAS, Defendant has certified that its plans for the North Baxter Property are 17 not likely to aggravate or contribute to contamination at the Facility, interfere with remedial actions I 8 that may be needed at the Facility, or increase human health risks to persons at or in the vicinity of 19 the Facility. 20 13. WHEREAS, this Decree will provide a substantial public benefit by promoting reuse 21 of a currently vacant parcel of land, providing substantial economic, community, and transportation 22 benefits to the area, and yielding substantial resources for environmental remediation. 23 14. WHEREAS, the Court is fully advised of the reasons for entry of this Decree and 24 good cause having been shown: 25 IT IS HEREBY ORDERED, ADJUDGED, AND DECREED AS FOLLOWS: 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 2 A ITORNEY GENERAL OF WASHINGTON Ecology Divis.ion PO Box40117 Olympia. WA 98504-0117 FAX (360) 43&, 7743 2 3 15. 16. I. AUTHORITY, JURISDICTION, AND VENUE This Court has authority to resolve the liability of the parties to this Decree. This Court has jurisdiction over the subject matter and over the parties pursuant to 4 MTCA. Venue is proper in King County pursuant to RCW 70.105D.050(5)(b). 5 17. Authority for entry of this Decree is conferred by RCW 70.IOSD.040(4) and 6 70.1 OSD.040(5), wltich authorize the Wasltington State Attorney General to agree to a settlement 7 with a prospective purchaser of a facility if, after public notice and hearing, Ecology finds the 8 proposed settlement would lead to a more expeditious cleanup of hazardous substances in 9 compliance with cleanup standards adopted under RCW 70.1 OSD.030(2)( d). RCW 70.1 OSD.040( 4) 10 and 70.IOSD.040(5) require that such a settlement be entered as a Consent Decree issued by a court 11 of competent jurisdiction. 12 18. Ecology finds that the proposed settlement would lead to a more expeditious cleanup 13 of hazardous substances in compliance with cleanup standards adopted under RCW 14 70.105D.030(2)(d) and that there are no "unique circumstances" as that term is defined in RCW 15 70.105D.040(4)(e)(ii). 16 19. Ecology will list the Facility on the Washington Hazardous Sites List. Ecology has J 7 not made a determination that PQC is a Potentially Liable Person ("PLP'') for the Facility. However, J 8 if PQC was to acquire an interest in the Facility without this Decree, it would become a PLP under 19 RCW 70.105D.040(1)(a). This Decree is entered before PQC acquires the North Baxter Property to 20 resolve PQC's potential liability at the Facility to the state of Washington and/or third parties for the 21 present contamination arising out of past activities associated with the Facility, including the 22 contamination associated with activities at the Facility that has been deposited, stored, disposed of, 23 placed, or otherwise come to be located within the Facility and to facilitate a more comprehensive 24 and expeditious cleanup than otherwise would occur. 25 20. By entering into this Decree, Defendant agrees not to challenge Ecology's jurisdiction 26 in any proceeding to enforce tltis Decree. Defendant consents to the issuance of this Decree and has PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 3 ATTORNEY GENERAL OF WASHINGTON Ecology Division PO Box40117 Olympia, WA 98504-0117 FAX(360) 438-7743 agreed to perform the terms of the Decree, including remediation, monitoring, and payment of 2 oversight costs as specified in this Decree. 3 II. DEFINITIONS 4 21. Whenever terms listed below are used in this Decree or in the attachments hereto, the 5 . following definitions shall apply: 6 7 a. b. The "North Baxter Property" is described in Attachment A attached hereto. "Feasibility Study/Cleanup Action Plan" shall mean the combined Feasibility 8 Study and Cleanup Action Plan, including other attachments thereto, dated 4/ 4/00 , attached to 9 this Decree as Attachment B. JO c. "Decree" shall mean this Decree and all attachments hereto. In the event of a 11 conflict between this Decree and any attachment, .this Decree shall control. 12 13 d. e. "Defendant" shall mean Port Quendall Company, a Washington corporation. "Facility" shall mean the North Baxter Property, as described on Attachment 14 A, and shown on Attachment D. 15 f. "Hazardous Substance" shall have the meaning defined in MTCA, RCW 16 70.105D.020(6). 17 g. "Paragraph" shall mean a portion of this Decree identified by an Arabic 18 numeral. 19 h. "Section" shall mean a portion of this Decree identified by a Roman numeral 20 and including one or more Paragraphs . 21 i. "Successors in Interest and Assigns" shall mean any person who acquires an 22 interest in the Property through purchase, lease, transfer, assignment, or otherwise, including those 23 who become a party to this Decree pursuant to Section XI. 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE Nonh Baxter 4 AITORNEY GENERAL OF WASHINGTON Ecology Division p0 Box 40117 Olympia. WA 98504-0117 FAX (360) 438.7743 III. DESCRIPTION OF FACILITY CONDITIONS 2 22. The North Baxter Property, known as the North J. H. Baxter Property/Renton ("North 3 Baxter Property"), is located at 5015 Lake Washington Boulevard North on the eastern shore of Lake 4 Washington in the northeastern portion of the City of Renton, in King County, Washington, as set 5 forth in Attachment A. The North Baxter Property occupies approximately 12 acres, three miles 6 south of the junction of Interstate Highways 405 and 90. The North Baxter Property is relatively flat 7 and is situated within the northern portion of a roughly 70-acre alluvial plain bordering the Lake 8 Washington shoreline. The Misty Cove Condominiwns are located directly to the north of the 9 Property. The South Baxter Property is located directly to the south ofthe Property. Further to the 1 o south is the Quendall Terminals property. Interstate 405 is approximately 500 feet to the east. 11 23. The North Baxter Property is bor:dered to the south by the South Baxter Property. The 12 North and South Baxter Properties have been determined to be separate facilities based on historic 13 operations, previous studies and previous correspondence and agreements between J. H. Baxter and 14 Ecology, which defined a "Line of Demarcation" between the two Properties. The line of 15 Demarcation was originally defined in the Renton-Baxter Remediation Security Interest Agreement 16 dated May 6, 1992 and subsequent Ecology correspondence. PQC and J .H. Baxter have submitted a 17 lot line adjustment application to formally segregate the North and South Baxter Properties. This 18 Consent Decree addresses the North Baxter Property. A separate Consent Decree, entered 19 simultaneously with this Consent Decree, addresses ihe South Baxter Property. 20 24. In 1873, Jeremiah Sullivan obtained all properties on the May Creek Delta (Baxter, 21 Quendall Terminals, Pan Abode, Barbee Mill) from the U.S. government and sold them in 1875 to 22 James M. Colman. In 1902, the timber on the subject parcels was sold, and in 1903, a right-of-way 23 was deeded to Northern Pacific. The Northern Pacific rail line later became the Burlington Northern 24 Santa Fe rail line which currently.abuts the Baxter Property. 25 25. The four properties remained within the Colman family through at least 1908, when 26 ownership of the subject parcels began to diverge. Peter Reilly took title to most of the waterfront PROSPECTIVE PURCHASER CONSENT DECREE Nonh Baxter 5 A TIORNEY GENERAL OF WASHINGTON Ecology Division PO BolS. 40117 Olympia, WA 98504--01 l 7 FAX (360) 418·7743 parcels in March of I 916. Between July and October of 1916, the U.S. Army Corps of Engineers 2 completed the Lake Washington Ship canal, which lowered the level of Lake Washington by 3 approximately 8 feet (U.S. Geological Survey, 1983). This increased the land area of the waterfront 4 parcels, by exposing formerly submerged portions of the May Creek Delta. 5 26. The J. H. Baxter wood treating plant was built in 1955 upon the deltaic deposits of 6 May Creek exposed by the lowering of Lake Washington. Wood treating operations were 7 discontinued in 1981. Prior to 1955 there is no known record of industrial or commercial activity on 8 the site. Currently, all of the former wood treating equipment has been removed. 9 27. During the years of operation, the J. H. Baxter plant operation on the South Baxter IO Property primarily used the Boulton process to treat wood. Although butt tanks were used for some 11 preservative applications, the plant principally used single pressure vessels (retorts) to treat wood. 12 Generally, pentachlorophenol was used to treat poles and creosote was used to treat pilings. 13 28. The North Baxter Property was used principally for storage of untreated poles and 14 pilings. Wood was stored on site as part of inventory and to facilitate drying prior to treatment 15 29. Based upon historical usage of chemicals at the site as well as analytical data 16 available from site investigation activities, the compounds of concern at the Facility are 17 pentachlorophenol (PCP) and polycyclic aromatic hydrocarbons (P AHs). These compounds are 18 known to exist in limited quantities in soil at the site. 19 30. Several investigations of potential contamination have been performed on the North 20 and South Baxter Facilities beginning in 1983 with an offshore sediment investigation of potential 21 hazardous substances and a subsurface hazardous waste investigation. In November, 1988, a 22 Consent Decree was entered into by J. H. Baxter and Ecology for the purpose of conducting a 23 preliminary Remedial Investigation (RI) under the Model Toxics Control Act (MTCA) (No. 88-2- 24 21599-5). The Consent Decree led to a Renton-Baxter Security Interest Agreement dated May 6, 25 1992, which provided that the North Baxter Property would act as security for certain South Baxter 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 6 ATIORNEY GENERAL OF WASHINGTON Ecology Division PO Box 40117 Olympia, WA 98504--0117 FAX (360)4,8-7743 ·-----------··----·--· Property cleanup obligations. Upon entry of this Consent Decree, Consent Decree No. 88-2-21599-5 2 shall be superseded and of no further force and effect, and the May 6, 1992 Renton-Baxter Security 3 Interest Agreement will be released and of no further force and effect. Comprehensive summaries of 4 project area historical information, records and environmental data have been provided in the Draft 5 Remedial Investigation Report (Woodward Clyde, 1990) conducted pursuant to the 1988 Consent 6 Decree, and in multiple documents prepared by ThermoRetec Consulting Corporation from 1997 to 7 present. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 IV. DESCRIPTION OF PROPOSED PROJECT 31. Defendant proposes to acquire the North Baxter Property (along with the South Baxter Property) to facilitate eventual commercial, urban residential, and/or retail development, either independently or as the northern portion of the potential Quendall Landing Development Project ("Project"), including adjacent properties, which could ultimately result in between approximately 400,000 and 3.0 milli1m square feet of ~evelopment at the north end of Renton. The North Baxter Property, along with the South Baxter Property is anticipated to include approximately 400,000 sq. ft. of development. 32. In 1989, the City of Renton began work on development ofa Comprehensive Plan affecting the Property and surrounding properties. Between 1990 and 1993, extensive public hearings and meetings were held, and notification was provided to impacted property owners and the general public concerning Comprehensive Plan land use alternatives and proposed Renton Zoning Code amendments. 33. In addition, in 1996 and 1997, an Environmental Impact Statement ("EIS'') scoping process was conducted in association with proposed development of the Facility. This EIS scoping process involved significant public participation, including mailings, formal comment, and public meetings. PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 7 A TIORNEY GENERAL OF WASHINGTON Ecology Division PO Box40117 Olympia. WA 9SS04-0ll7 FAX (360) 4)8-7743 34. Any property development will be completed in accordance with the Renton 2 Comprehensive Plan and area-wide zoning Center Office Residential designation. 3 35. Development of the North Baxter Property and the South Baxter Property is expected 4 to create a significant number of well-paying jobs and spur development in the north end of Renton. 5 Substantial tax revenues would be generated to benefit Renton and the state of Washington. 6 36. Defendant has complied with the State Environmental Policy Act ("SEPA") 7 environmental review requirements for the proposed remedial actions to be performed. Ecology has 8 been established as the agency lead pursuant to SEP A. The SEP A Determination ofNonsignificance 9 and Environmental Checklist are attached as Attachment H. 10 V. WORKTOBEPERFORMED 11 37. Upon the Effective Date of this Decree, Defendant will perform the Cleanup Action 12 Plan described in Attachment B, including all attachments thereto, according to the schedule 13 provided therein. Cleanup activities include placement of gravel and a clean soil layer or other 14 development features to allow residential development. Coordination between site cleanup and 15 redevelopment would minimize disruption to the surrounding community. As such, the actual 16 schedule for the site cleanup may vary to facilitate this coordination. 17 38. Defendant agrees not to perform any remedial actions for the release of Hazardous 18 Substances covered by this Decree, other than those required by this Decree, unless the parties agree 19 to amend the Decree to cover those actions. All work conducted under this Decree shall be done in 20 accordance with Chapter 173-340 WAC unless otherwise provided herein. All work conducted 21 pursuant to this Decree shall be done pursuant to the cleanup levels specified in the Feasibility 22 Study/Cleanup Action Plan (Attachment B). 23 39. Defendant agrees to record the Restrictive Covenant (Attachment C) with the Office 24 of the King County Recorder upon completion of the capital portion of the Feasibility Study/Cleanup 25 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 8 ... -··----·---------------- ATTORNEY GENERAL OF WASl-liNGTON Ecology Division PO Bo:it 40ll7 Olympia, WA 98504.()J l7 FAX (360) 438-1743 Action Plan and shall provide Ecology with proof of such recording within thirty (30) days of 2 recording. 3 VI. ECOLOGY COSTS 4 40. Defendant agrees to pay all oversight costs incurred by Ecology pursuant to this 5 Decree. This oversight payment obligation shall not include costs already paid pursuant to the 6 Prepayment Agreement entered between Ecology and JAG Development Inc. dated October 2, 1996. 7 The oversight costs required to be paid under this Decree shall include work performed by Ecology 8 or its contractors for, or on, the Facility under Chapter 70.IOSD RCW, both before and after the 9 issuance ofthis Decree, for Decree preparation, negotiations, and administration. Ecology oversight IO costs shall be calculated pursuant to WAC 173-340-550(2) and shall include direct staff costs, an 11 agency support cost multiplier, and a program support cost multiplier for all oversight costs. 12 41. Defendant agrees to pay Ecology oversight costs within ninety (90) days of receiving 13 from Ecology an itemized statement of costs that includes a summary of costs incurred, an 14 identification of involved staff, and the amount of time spent by involved staff members on the 15 project. Ecology shall, upon request, provide Defendant with a general statement of work 16 performed. Ecology shall prepare itemized statements of its oversight costs quarterly. Failure to pay 17 Ecology's costs within ninety (90) days of receipt of the itemized statement will result in interest 18 charges at the rate of twelve (12) percent per annum. 19 42. In the event Defendant disputes expenditures or the adequacy of documentation for 20 which reimbursement is sought, the parties agree to be bound by the dispute resolution process set 21 forth in Section XII. 22 VII. DESIGNATED PROJECT COORDINATORS 23 24 25 26 43. The project coordinator for Ecology is: PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 9 A TfORNEY GENERAL OF WASHINGTON Ecology Division POBox401l7 Olympia. WA 91504-0117 FAX (360) 438-7743 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Gail Colburn Toxics Cleanup Program Department of Ecology Northwest Regional Office 3190-160thAvenueSE Bellevue, WA 98008-5452 (206) 649-7265 The project coordinator for Defendant is: Grant Hainsworth ThermoRetec Consulting Corporation IO 11 SW Klickitat Way, Suite 207 Seattle, WA 98134 44. Each project coordinator shall be responsible for overseeing the implementation of this Decree. The Ecology project coordinator will be Ecology's designated representative at the Property. To the maximum extent possible, communications between Ecology and Defendant and all documents, including reports, approvals, and other correspondence concerning the activities performed pursuant to the terms and conditions of this Decree, shall be directed through the project coordinators. The project coordinators may designate, in writing, working-level staff contacts for all or portions of the implementation of Section V of this Decree, including the Feasibility Study/Cleanup Action Plan, incorporated in this Decree as Attachment B. The project coordinators may agree to minor modifications to the work to be performed without formal amendments to this Decree. Minor modifications will be documented in writing by Defendant and approved by Ecology. 45. Any party may change its respective project coordinator. Written notification shall be given to the other party at least ten (JO) days prior to the change. VIII. PERFORMANCE 46. All work performed pursuant to this Decree shall be under the direction and supervision, as necessary, of a professional engineer or hydrogeologist, or equivalent. Any construction work must be under the supervision of a professional engineer. Defendant shall notify Ecology in writing as to the identity of such engineer(s) or hydrogeologist(s) or others and of any contractor(s) and subcontractor(s), including the contractor responsible for installation of required PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 10 ATTORNEY GENERAL OF WASHrNGTON Ecology Division POBox40117 Olympia. WA 98S04-0117 FAX (360) 438-7743 mitigation actions, to be used in carrying out the terms of this Decree in advance of their 2 involvement at the Facility. 3 IX. CERTIFICATIONS 4 47. Defendant certifies that, to the best of its knowledge and belief, it has fully and 5 accurately disclosed to Ecology the information currently in its possession that relates to the 6 environmental conditions at the Facility, or to Defendant's right and title thereto. 7 48. Defendant represents and certifies that, to the best of its knowledge, it is not aware of 8 any facts that would give rise to liability to it under RCW 70.105D.040 prior to acquisition of the 9 Baxter Property. 10 49. Defendant represents and certifies its belief that redevelopment of the North Baxter 11 Property is not likely to contribute to the existing release or threatened release of Hazardous 12 Substances from the Facility, interfere with future remedial actions that may be needed at the 13 Facility, or increase health risks to persons at or in the vicinity of the Facility. 14 50. If any certification provided by Defendant pursuant to this Section is not true, the 15 Covenant Not To Sue in Section XIV shall not be effective with respect to.Defendant, and Ecology 16 reserves all rights it may have against Defendant. 17 X. PARTIES BOUND; CONVEYANCE OF PROPERTY 18 51. The restrictions, obligations, and rights set forth in this Decree shall be binding upon 19 the parties to this Decree. Qualified Successors in Interest and Assigns may become parties to this 20 Decree at the option of Defendant, by following the amendment procedures set forth in Section XL 21 52. Defendant shall implement contractual provisions that require all Successors in 22 Interest and Assigns to this Decree to comply with the applicable provisions of this Decree. 23 53. If proposed Successors in Interest and Assigns wish to become a party to this Decree, 24 Defendant and the proposed transferee(s) shall notify Ecology and the Attorney General's office of 25 the proposed transfer, the name of the proposed transferee(s), and the proposed transferee(s) intended 26 PROSPECTNE PURCHASER CONSENT DECREE Nonh Baxter 11 A ITORNEY GENERAL OF WASHINGTON Ecology Division PO Box40117 Olympia, WA 98504-0117 FAX (360) 438•7743 ----------------------- use of the North Baxter Property. The notification required by this Paragraph shall occur at least 30 2 days before the date of a proposed transfer of interests. Such notification shall be in the form of 3 Attachment E to this Decree. 4 54. In the event Defendant assigns all of its fee interest to a Successor in Interest or 5 Assign, and that Successor in Interest or Assign becomes a party to this Decree, at Ecology's sole 6 discretion and with its concurrence, Ecology shall thereafter look first to such successor for 7 performance of the requirements of this Decree, including, but not limited to, performance of the 8 work as described in Section V, and payments of Ecology costs described in Section VI. 9 55. Defendant shall further provide 30 days advance written notice to Ecology of 10 Defendant's intent to convey any fee interest in a substantial portion of the North Baxter Property. 11 No conveyance of title in the North Baxter Property shall be consummated by Defendant without 12 adequate provision for continued monitoring, operation and maintenance of the remedial actions 13 called for in this Decree. Failure of the Defendant or the proposed transferee to timely comply with 14 this Section's notification requirements does not in any way alter the rights and obligations of such 15 party as set forth in this Decree. 16 XI. AMENDMENT OF CONSENT DECREE; ADDING NEW PARTIES TO DECREE 17 18 19 20 21 22 23 24 25 26 56. This Decree may only be amended by a written stipulation among the parties to this Decree that is thereafter entered and approved by order of the Court. Such amendment shall become effective upon entry by the Court, or upon a later date if such date is expressly stated in the parties' written stipulation or the Court so orders. 57. Amendments may cover any subject or be for any purpose agreed to by the parties to this Decree. If Ecology determines that the subject of an amendment requires public input, Ecology shall provide thirty (30) days' public notice prior to seeking entry of the amendment by the Court. 58. Whenever the Defendant contemplates conveying an interest in the Property to a proposed Successor in Interest and Assign, the proposed Successors in Interest and Assigns may PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 12 ATTORNEY GENERAL OF WASHINGTON Ecology Division PO Box40117 Olympia. WA 98504-0117 FAX (360) 433-7743 2 3 4 . 5 6 7 8 9 10 II 12 13 ! 14 15 16 17 18 19 20 21 22 23 24 25 26 request that the Decree be amended as provided for in this paragraph. The amendment to the Decree shall be in the form of Attachment F, "Agreement of Successors in Interest and Assigns." Ecology may withhold consent to an amendment making proposed Successors in Interest and Assigns a party to this Decree only if Defendant or its Successors in Interest and Assigns is in violation or will be in violation of a material term of this Decree . 59. The parties contemplate that various interests in the North Baxter Property may be granted to parties who will be "Successors in Interest and Assigns", but may choose not to become parties to this decree. Examples include tenants leasing space in completed buildings, lenders taking a security interest in all or a portion of the North Baxter Property and persons obtaining limited possessory rights in the North Baxter Property. Nonetheless, such parties will be entitled to the protections, if any, afforded by RCW 70.105D.040(4)(e) and (f). XII. DISPUTE RESOLUTION 60. In the event a dispute arises as to an approval, disapproval, proposed modification, or other decision or action by Ecology's project coordinator. pertaining to implementation of the Feasibility Study/Cleanup Action Plan, the parties shall use the dispute resolution procedure set forth below. a. Upon receipt of the Ecology project coc,rdinator's written decision, Defendant has fourteen ( 14) days within which to notify Ecology's project coordinator of any objection to the decision. b. The parties' project coordinators shall then confer in an effort to resolve the dispute. If the project coordinators cannot resoive the dispute within fourteen (14) days following the conference, Ecology's project coordinator shall issue a written decision. c. Defendant may then request Ecology management review of the decision. This request shall be submitted in writing to the Toxics Cleanup Program Northwest Region Manager within seven (7) days of receipt of Ecology's project coordinator's written decision. PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 13 ATTORNEY GENERAL OF WASHINGTON Ecology Division PO Box 40117 Olympia, WA 98504..0l 17 FAX (360) 438,7743 d. Ecology's Toxics Cleanup Program Northwest Region Manager shall conduct 2 a review of the dispute and shall issue a written decision regarding the dispute within thirty (30) days 3 of the Defendant's request for review. The Toxics Cleanup Program Northwest Region Manager's 4 decision shall be Ecology's final decision on the disputed matter. 5 61. If Ecology's final written decision is unacceptable to Defendant, Defendant has the 6 right to submit the dispute to the Court for resolution. The parties agree that one judge should retain 7 jurisdiction over this case and shall, as necessary, resolve any dispute arising under this Decree. For 8 disputes concerning Ecology's investigative and remedial decisions that arise under this Decree, the 9 Court shall review the actions or decisions of Ecology under an arbitrary and capricious standard. 10 62. The parties may mutually agree to substitute an Alternative Dispute Resolution 11 (ADR) process, such as mediation, for the formal dispute resolution process set forth in this Section. 12 63. The parties agree to use the dispute resolution process in good faith and agree to 13 expedite, to the extent possible, the dispute resolution process whenever it is used. When either 14 party uses the dispute resolution process in bad faith or for purposes of delay, the other party may 15 seek sanctions. 16 64. The implementation of these dispute resolution procedures shall not provide a basis 17 for delay of any activities required in this Decree, unless Ecology agrees in writing to a schedule 18 extension or the Court so orders. 19 65. The parties agree that this Decree is not intended to alter any evidentiary burdens of 20 either party in any proceeding by Ecology for costs or claims involving the North Baxter Property. 21 XIII. CONTRIBUTION PROTECTION 22 66. With regard to claims for contribution against Defendant, the parties intend that 23 Defendant will obtain the protection against claims for contribution for matters addressed in this 24 Decree pursuant to MTCA, RCW 70.105D.040(4)(d). 25 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 14 A TIORNEY GENERAL, OF WASHINGTON Ecology Division PO Box 40117 Olympia. WA 98504-0117 FAX (360) 438-7743 1 2 3 4 5 6 7 8 9 10 11 12 13 \· I 14 15 16 17 18 19 20 21 22 23 24 25 26 XIV. COVENANT NOT TO SUE; REOPENERS 67. In consideration of Defendant's compliance with the terms and conditions of this Decree, Ecology agrees that compliance with this Decree shall stand in lieu of any and all administrative, legal, and equitable remedies and enforcement actions ("Actions") available to the state against Defendant or Successors in Interest for releases or threatened releases of Hazardous Substances at the Facility, provided such Actions pertain to Hazardous Substances which Ecology knows or believes to be located at the Facility as of the date of this Decree. This covenant is strictly limited to the Facility as defined in Section II of this Decree and shown on Attachment D. 68. Reopeners: In the following circumstances, Ecology may exercise its full legal authority to address releases of Hazardous Substances at the Facility, notwithstanding. the Covenant Not To Sue set forth above: a. In the event Defendant fails to comply with the terms and conditions of this Decree, including all attachments, and after written notice of noncompliance, such failure is not cured by such Defendant within sixty (60) days ofreceipt of notice of noncompliance. b. In the event factors not known at the time of entry ofthis Agreement and not disclosed to Ecology are discovered and such factors present a previously unknown threat to human health or the environment and are not addressed by the Feasibility Study/Cleanup Action Plan (Attachment B). If such factors are discovered, Ecology shall give written notice to Defendant. Defendant will have sixty (60) days from receipt of notice to propose a cure to the condition giving rise to the threat. If such cure is acceptable to Ecology, Defendant and Ecology will negotiate an appropriate timetable for implementation. c. Upon Ecology's determination that actions beyond the terms of this Decree are necessary to abate an emergency situation which threatens public health, welfare, or the environment. 69. Applicability: The Covenant Not to Sue set forth above shall have no applicability whatsoever to: PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 15 A TIORNEY GEIIERAL OF WASHlNGTON Ecology Di,..ision PO Box 40117 Olympia, WA 98504-0117 FAX (360) 438-7143 I 2 3 4 70. a. Criminal liability. b. Actions against PLPs not party to this Decree. C. Liability for damages for injury to, destruction of, or loss of natural resources. Ecology retains all of its legal and equitable rights against all persons, except as 5 otherwise provided in this Decree. 6 XV. RESERVATIONOFRIGHTS 7 71. Defendant reserves all rights and defenses which it may have and which are not 8 otherwise addressed in this Decree, including the right to seek contribution or cost recovery for funds 9 expended pursuant to this Decree, subject to the limitations in Section XXVI. 10 72. Except as provided herein for the parties, this Decree does not grant any rights or 11 affect any liabilities of any person, firm, or corporation or subdivision or division.of state, federal, or 12 local government. 13 XVI. DISCLAIMER 14 73. This Decree does not constitute a representation by Ecology that the Property is fit for 15 any particular purpose. 16 XVII. RETENTION OF RECORDS 1.7 74. Defendant shall preserve, during the pendency of this Decree and for ten (10) years 18 from the date this Decree is no longer in effect as provided in Section XXVIII, all records, reports, 19 documents, and underlying data in its possession relevant to the implementation of this Decree and 20 shall insert in contracts with project contractors and subcontractors a similar record retention 21 . requirement. Defendant shall retain all monitoring data so long as monitoring is ongoing as provided 22 in the Feasibility Study/Cleanup Action Plan (Attachment B). In the event the Feasibility 23 Study/Cleanup Action Plan (Attachment B) is modified to terminate monitoring, Defendant shall 24 retain all monitoring data until ten ( I 0) years after monitoring is completed. Upon request of 25 26 PROSPECTIVE PURCHASER CONSENT DECREE Nonh Baxter 16 A ITORNEY GENERAL OF WASHINGTON Ecology Division PO Box 4011"7 Olympia, WA 98504-0117 FAX(360) 438-7743 1 2 3 4 5 6 7 8 9 10 11 12 13 < ) 14 15 16 17 18 19 20 21 22 23 24 25 26 Ecology, Defendant shall make all nonarchived records available to Ecology and allow access for review. All archived records shall be made available to Ecology within a reasonable period of time. XVIII. PROPERTY ACCESS 75. Defendant grants to Ecology, its employees, agents, contractors, and authorized representatives an irrevocable right to enter upon the Property with reasonable notice and at any reasonable time for purposes of allowing Ecology to monitor or enforce compliance with this Decree. The right of entry granted in this Section is in addition to any right Ecology may have to enter onto the Property pursuant to specific statutory or regulatory authority. Consistent with Ecology's responsibilities under state and federal law, Ecology, and any persons acting for it, shall use reasonable efforts to minimize any interference and use reasonable effort not to interfere with the operations of Defendant or Successors in Interest by any such entry. In the event Ecology enters the Property for reasons other than emergency response, Ecology agrees that it shall provide reasonable notice to Defendant of any planned entry, as well as schedules and locations of activity on the Property. Ecology further agrees to accommodate reasonable requests that it modify its scheduled entry or activities at the Property. Notwithstanding any provision of the Decree, Ecology retains all of its access authorities and access rights, including enforcement authorities related thereto, under MTCA and any other applicable state statute or regulation. XIX. COMPLIANCE WITH OTHER APPLICABLE LAWS 76. All actions carried out by Defendant or Successors in Interest pursuant to this Decree . shall be done in accordance with all applicable federal, state, and local requirements, including applicable permitting requirements. Pursuant to RCW 70.IOSD.090(1), the known and applicable substantive requirements of Chapters 70.94, 70.95, 70.105, 75.20, 90.48, and 90.58 RCW, and any laws requiring or authorizing local government permits or approvals for remedial action, have been included in the RI and the Feasibility Study/Cleanup Action Plan and are incorporated by reference here as binding requirements in this Decree. PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 17 A TIORNEY GENERAL OF WASHINO'ION Ecology Division PO Box. 40117 Olympia, WA 98504-0117 FAX (360) 438,7743 ) Defendant has a continuing obligation to determine whether additional permits or approvals 2 addressed in RCW 70.1050.090(1) would otherwise be required for the remedial action under this 3 Decree. In the event either Defendant or Ecology determines that additional permits or. approvals 4 addressed in RCW 70.105D.090(1) would otherwise be required for the remedial action under this 5 Decree, it shall promptly notify the other party of this determination. Ecology shall determine 6 whether Ecology or Defendant shall be responsible to contact the appropriate state and/or local 7 agencies. If Ecology so requires, Defendant shall promptly consult with the appropriate state and/or 8 local agencies and provide Ecology with written documentation from those agencies of the 9 substantive requirements those agencies believe are applicable to the remedial action. Ecology shall IO make the determination on the additional substantive requirements that must be met by Defendant 11 and on how Defendant must meet those requirements. Ecology shall inform Defendant in writing of 12 these requirements. Once established by Ecology, the additional requirements shall be enforceable 13 requirements of this Decree. Defendant shall not begin or continue the remedial action potentially 14 subject to the additional requirements until Ecology makes its final determination. 15 Ecology shall ensure that notice and opportunity for comment are provided to the public and 16 appropriate agencies prior to establishing the substantive requirements under this Section. 17 77. Pursuant to RCW 70.1050.090(2), in the event that Ecology determines that the 18 exemption from complying with the procedural requirements of the Jaws referenced in RCW 19 70.105D.090(1) would result in the loss of approval from a federal agency necessary for the state to 20 administer any federal law, such exemption shall not apply, and Defendant or Successors in Interest 21 shall comply with both the procedural and substantive requirements of the laws referenced in RCW 22 70.105D.090(1). 23 XX. SAMPLING, DATA REPORTING, AND AVAILABILITY 24 78. With respect to the implementation of this Decree, Defendant shall make the results 25 of all sampling, laboratory reports, and/or test results generated by it, or on its behalf, available to 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 18 A ITORNEY GENERAL OF WASHINGTON Ecology Division POBox.40117 Olympia, WA. 98504-01 t7 FAX (360) 438-7743 ··········~------- I ' Ecology in hard copy and on electronic disk. Data submitted on disk shall be in a format acceptable 2 to Ecology for importation for use as a relational database into databases and/or spreadsheet software 3 · commonly available. 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 79. If requested by Ecology, Defendant shall allow Ecology and/or its authorized representatives to take split or duplicate samples of any samples collected by Defendant pursuant to the implementation of this Decree. Defendant shall notify Ecology seven (7) days in advance of any sample collection or work activity at the Property. Ecology shall, upon request, allow Defendant or its authorized representatives to take split or duplicate samples of any samples collected by Ecology pursuant to the implementation of this Decree provided Defendant does nofinterfere with Ecology's sampling. Ecology shall endeavor to notify Defendant prior to any sample collection activity. XXI. PROGRESS REPORTS 80. Defendant shall submit to Ecology written monthly progress reports beginning thirty (30) days prior to initiation of the Feasibility Study/Cleanup Action Plan (Attachment B) and continuing until completion of the Work to Be Performed as described in Section V. After that time, progress reports shall be submitted quarterly, or at other intervals as approved by Ecology. The progress reports shall describe the actions taken during the reporting period to implement the requirements of this Decree. The progress report shall include the following: a. A list of on-site activities that have taken place during the reporting period. b. A detailed description of any deviations from required tasks not otherwise documented in project plans or amendment requests. c. A description of all deviations from the schedule during the current reporting period and any planned deviations in the upcoming reporting period. d. For any deviations in schedule, a plan for recovering lost time and maintaining compliance with the schedule. PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 19 ATTORNEY GENERAL OF WASHINGTON Ecology Division PO Box.40117 Olympia. WA 98S04-0117 FAX (l60) 433.7743 l e. A list of deliverables for the upcoming reporting period if different from the 2 schedule. 3 81. All progress reports shall be submitted by the tenth day of the month in which they 4 are due after the E'.ffective Date of this Decree. 5 XXII. EXTENSION OF SCHEDULE 6 82. An extension of schedule shall be granted only when a request for an extension is 7 submitted in a timely fashion, generally at least thirty (30) days prior to expiration of the deadline for 8 which the extension is requested, and good cause exists for granting the extension. All extensions 9 shall be requested in writing. The request shall specify the reason(s) the extension is needed. 10 83. An extension shall be granted only for such period of time as Ecology determines is 11 reasonable under the circumstances. A requested extension shall not be effective until approved by 12 Ecology or the Court. Ecology shall act upon any written request for extension in a timely fashion. 13 It shall not be necessary to formally amend this Decree pursuant to Section XI when a schedule 14 extension is granted. 15 84. The burden shall fall on Defendant to demonstrate to the satisfaction of Ecology that 16 the request for such an extension has been submitted in a timely fashion and that good cause exists 17 for granting the extension. Good cause includes, but is not limited to, the following: 18 a. Circumstances beyond the reasonable control and despite the due diligence of 19 Defendant, including delays in obtaining necessary permits, delays caused by unrelated third parties 20 or Ecology, such as (but not limited to) delays by Ecology in reviewing, approving, or modifying 21 documents submitted by Defendant. 22 b. Acts of God, including fire, flood, blizzard, extreme temperatures, storm, or 23 other unavoidable casualty. 24 25 26 c. Endangerment as described in Section XXIII. PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 20 A TIORNEY GENERAL OF WASHINGTON Ecology Division PO Box 40117 Olympia, WA 98504-0117 FAX (360) 438-7743 Ecology.may extend the schedule for a period not to exceed ninety .(90) days, except where a 2 longer extension is needed as a result of: 3 a. Delays in the issuance of a necessary permit which was applied for in a timely 4 manner. 5 b. Other circwnstances deemed exceptional or extraordinary by Ecology. 6 However, neither increased costs of performance of the terms of the Decree nor changed 7 economic circumstances shall be considered circumstances beyond the reasonable control of 8 Defendant. 9 Ecology shall give Defendant written notification in a timely fashion of any extensions 10 granted pursuant to this Decree. 11 XXIII. ENDANGERMENT 12 85. If, during implementation of this Decree, Ecology determines that there is an actual or 13 imminent danger to human health or to the environment, Ecology may order Defendant to stop 14 further implementation of this Decree for such period of time as needed to abate the danger or may 15 petition the Court for an order as appropriate. During any stoppage of work under this Section, the 16 obligations of Defendant shall be suspended, and the time period for performance of that work, as 17 well as the time period for any other work dependent upon the work which is stopped, shall be 18 extended, pursuant to Section XXII of this Decree, for such period of time as Ecology determines is 19 reasonable under the circumstances. 20 86. In the event Defendant determines that activities undertaken in furtherance of this 21 Decree or any other circumstances or activities are creating an imminent danger to human health or 22 to the environment, Defendant may stop implementation of this Decree for such period of time 23 necessary for Ecology to evaluate the situation and determine whether Defendant should proceed 24 with implementation of the Decree or whether the. work stoppage should be continued until the 25 danger is abated. Defendant shall notify Ecology's project coordinator as soon as possible, but no 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 21 ATTORNEY GENERAL OF WASHINGTON EcolOI)' Division PO Box 40117 Olympia. WA 98504-0117 FAX (3'0) 433.7743 later than twenty-four (24) hours after stoppage of work, and thereafter provide Ecoiogy with 2 docwnentation of the basis for the work stoppage. If Ecology disagrees with Defendant, Ecology · 3 may order Defendant to resume implementation of this Decree. If Ecology concurs with the work 4 stoppage, Defendant's obligations shall be suspended, and the time period for performance of that 5 work, as well as the time period for any other work dependent on the work which was stopped, shall 6 be extended, pursuant to Section. XXII of this Decree, for such period of time as Ecology determines 7 is reasonable under the circumstances. Any disagreements pursuant to this Section shall be resolved 8 through the dispute resolution procedures in Section XII. 9 XXIV. CERTIFICATION OF COMPLETION AND DELISTING IO 87. In order to facilitate the redevelopment of the North Baxter Property, upon 11 completion of the remedial actions specified in the Feasibility Study/Cleanup Action Plan 12 (Attachment B), Ecology shall issue a Certificate of Completion. Unless Ecology becomes aware of 13 circumstances at the Facility that present a previously llllknown threat to human health or the 14 environment, Ecology shall, within thirty (30) days of issuance of the Certificate of Completion, 15 propose to remove the Facility from the Hazard Ranking List, pursuant to WAC 173-340-330( 4). 16 XXV. INDEMNIFICATION AND HOLD HARMLESS 17 88. To the extent allowed by law, Defendant and its Successors in Interest (hereinafter 18 collectively the "Indemnitors") agree to defend, hold harmless, and indemnify the state of 19 Washington, its employees, and agents from any and all claims or causes of action for death or 20 injuries to persons or for loss or damage to property arising from or on account of acts or omissions 21 of Indemnitors, their officers, employees, agents, or contractors in entering into and implementing 22 this Decree. However, Indemnitors shall not indemnify the state of Washington nor save nor hold its 23 employees and agents harmless from any claims or causes of action arising out of the negligent acts 24 or omissions of the state of Washington, or the employees or agents of the state, in implementing the 25 activities pursuant to this Decree. In any claims against the state by any employee of the 26 PROSPECTNE PURCHASER CONSENT DECREE North Baxter 22 A ITORNEY GENERAL OF WASHINGTON Ecology Division PO Box 40117 . Olympll, WA 98504.0117 FAX (360) 433.7743 Indemnitors, the indemnification obligation shall not be limited in any way by the limitation on the 2 amount or type of damages, compensation, or benefits payable by or for the Indemnitors under 3 workmen's compensation acts, disability benefit acts, or other employee benefits acts. 4 XXVI. CLAIMS AGAINST THE STATE 5 89. Defendant hereby agrees that it will not seek to recover any costs accrued in 6 implementing the remedial action required by this Decree from the state of Washington or any of its 7 agencies other than loans or grants from the State Toxics Control Account or any Local Toxics 8 Control Account for any costs incurred in implementing this Decree. Except as provided above, 9 however, Defendant expressly reserves its right to seek to recover any costs incurred in IO implementing this Decree from any other potentially liable person. 11 XXVII. PUBLIC PARTICIPATION 12 90. Public participation shall be accompHshed by implementing the Public Participation 13 Plan attached as Attachment G. Ecology shall maintain the responsibility for public participation in 14 accordance with WAC l 73-340-600(8)(g). Defendant shall help coordinate and implement public 15 participation for the Property as required by Ecology. 16 XXVIII. DURATION OF DECREE AND RETENTION OF JURISDICTION 17 91. This Decree shall remain in effect and this Court shall retain jurisdiction over both the 18 subject matter of this Decree and the parties for the duration of the performance of the terms and 19 provision of this Decree for the purpose of enabling any of the parties to apply to the Court, as 20 provided in the dispute resolution process set forth in Section XII, and the amendment process set 21 forth in Section XI, at any time for such further order, direction, and relief as may be necessary or 22 appropriate to ensure that obligations of the parties have been satisfied. The Decree shall remain in 23 effect until the parties agree otherwise or until Defendant has been notified by Ecology in writing 24 that the requirements of this Decree have been satisfactorily completed. 25 26 PROSPECTIVE PURCHASER CONSENT DECREE North Baxter 23 A TIORNEY GENERAL OF WASHINGTON E!;:ology Division POBox:40117 Olympia., WA 98S04-0l 17 FAX (360) 438· 7743 2 3 4 5 6 7 8 9 10 11 12 13 ·1 14 15 16 17 18 19 20 21 . 22 23 24 25 26 XXIX. PUBLIC NOTICE AND WITHDRAW AL OF CONSENT 92. Titis Decree has been the subject of public notice and comment as required by RCW 70.105D.040(4)(a). As a result of this process, Ecology has found that this Decree will lead to a more expeditious cleanup of Hazardous Substances at the Property, in compliance with applicable cleanup standards, and is in the public interest. 93. If the Court withdraws its consent, this Decree shall be null and void at the option of any party, and the accompanying Complaint shall be dismissed without costs and without prejudice. In such an event, no party shall be bound by the requirements of this Decree. XXX. SEVERABILITY 94. If any section, subsection, sentence, or clause of this Agreement is found to be illegal, invalid, or unenforceable, such illegality, invalidity, or unenforceability will not affect the legality, validity, or enforceability of the Agreement as a whole or of any other section, subsection, sentence, or clause. XXXI. EFFECTIVE DATE 95. The Effective Date of this Decree is the final date when both this Decree has been entered by the Court and the closing of the property purchase is completed as defined in the Property Purchase Agreement between Port Quendall Company and J. H. Baxter & Co. SO ORDERED this ~day of _ _._fil4Jc=..-;==-~· 2000. PROSPECTIVE PURCHASER CONSENT DECREE North Baxter ~~~o~rior Court 24 ~H'M AITORNEYGENERALOFWASHJNGTON Ecology Diviiion PO Box 40117 Olympia, WA 98S04-0117 FAX (]60) 438-774] ·-------·-· ----------------------·-···---·--. 1 The undersigned parties enter into this Prospective Purchaser Consent Decree on the date . 2 specified below. 3 4 5 6 7 8 9 10 11 12 13 \ 14 15 16 17 18 19 20 21 22 23 24 25 26 PORT QUENDALL COMPANY, a Washington corporation PROSPECTIVE PURCHASER CONSENT DECREE North Baxter :dt.,-. I 25 ATTORNEY GENERAL'S OFFICE By: ;£,... . < k d Printed Nam4' 7,f,: ,,,,,, c , 1,,',,f/ Date: . / ,.,-J n;a ) y. DEPARTMENT OF ECOLOGY ~~ ATIORNEY GENERAL OF WASHINGTON Ecology Division PO Bo,c. 40117 Olympia. WA 98S04..0117 FAX (360) 438,7743 ATTACHMENT C RESTRJCTIVE COVENANT NORTH BAXTER [Correct Recording Format To Be Added] This Declaration of Restrictive Covenant is made ·-- DRAFT April 4, 2000 ----- ··-- 70.105D.030(l)(f) and (g) and WAC l 73-340-44Q.=ajt::@it. Q~ompan15---a= _ Washington corporation, its successors _and ~' ai:ii:Ellia StaltFel Washingwn~=· =· ==- Department o~its suc~~ssi._gns-(he~logy'!:i::=? - . These documents are on file at ---- resigjral concentrations of certain hazardous substances which exceed the Model Toxics Control Act Method B Residential Cleanup Levels for soil established under WAC 173- 340-740. These cleanup levels are described in the Final Feasibility Study/Cleanup Action Plan for North J. H. Baxter Property, Renton, Washington, dated The undersigned, Port Quendall Company, is the fee owner of real property (hereafter "Property'') in the County of King, State of Washington, that is subject to this SOUiBd Ol Restrictive Covenant. The Property is legally described as set forth i~bit t, attached. Port Quendall Company makes the following declaration restrictions, and uses to which g.,if cap maintenance is permitted without notice to Ecology so long as appr~11ate health and safety protocols are followed. A Soil Management Plan will be prepared for Ecology approval that outlines specific protocols associated with future soil excavations, including health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options. In accord with the Soil Management Plan, limited excavation, utility placement or repair, minor site grading, or other pre-approved activities connected with site development and construction are permitted so long as appropriate health and safety protocols are followed and a soil cap that provides 2 S016J348 OJ protection from direct contact as required by the Cleanup Action Plan i~videtl following development. Remedial Action and continued protection of human health and {Iii! @ii ii oomen and contemplates development of the Prnper1J?:::§5ll-nifie,-b-use (fl:lSHfimtial, ----------------------- withifi:aw, or allow others to withdraw, groundwater from the Property. Section 5. Following implementation of the Cleanup Action Plan, access shall be restricted to prevent swimming or direct contact with contaminated sediments at the south border of the Property. Section 6. Following implementation of the Cleanup Action Plan, residential use on the Property is permitted so long as a soil cap (as described in the Cleanup Action plan) is present that prevents direct contact with all soil that exceeds Method B Cleanup Levels. 3 ~L6JJ~8 OJ Section 7. The Owner of the property must give thirty (30) day adv~ritte,, notice to Ecology of the Owner's intent to convey a fee interest in a substailtral=pgrtio right:tcrenter the Property at reasonable times for the purpose of evaluating the Remedial Action; to take samples, to inspect remedial actions conducted at the property, and to inspect records that are related to the Remedial Action. Ecology shall use reasonable efforts to minimize any interference and use reasonable efforts not to interfere with the operations of the Property occupancy. Section 11. The Owner of the Property reserves the right under WAC 173-340- 440 to record an instrument that provides that this Restrictive Covenant shall no longer limit use of the Property or be of any further force or effect. However, such an 4 ~l6J~<II! 0] instrument may be recorded only if Ecology, after public notice and opportunity foe comment, concurs. PORT QUENDALL COMPANY, a Washington corporation By: Its: ------------ ~16334B 03 5 ~-----------·· ---- ------ -------------- ---------- ·---------------------------------- ST A TE OF W ASHTNGTON COUNTY OF~--- certify that as 501())]48 0) ) ) ss. ) know or have satisfactory (Signature ofNotary) (Legibly Pri111 or Stamp Name of Notary) Notary public in and for the State of Washington, residing at ______ _ My appointment expires _____ _ 6 EXP04 RltCEIVED 11'1 Kil'lg Co@ty svwior Coull Cle,~·, omce MAY 1 8 2000 Cashier Section KNT Superior Court Clerk 2 3 4 5 6 7 IN THE SUPERJOR COURT OF THE STATE OF WASHINGTON IN AND FOR KING COUNTY 8 STATE OF WASHINGTON DEPARTMENT OF ECOLOGY, 9 10 11 v. Plaintiff, PORT QUENDALL COMPANY, a Washington 12 corporation, 13 14 15 16 17 18 19 20 21 22 23 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter Defendant. EXHIBIT NO O -2 -11 7 7 9 -5 KN PROSPECTIVE PURCHASER CONSENT DECREE RE: SOUTH J.H. BAXTER PROPERTY/RENTON B ATIORNEY GENERAL OF WASHINGTON Ecology Divi:sion PO Box 40117 Olympia., WA 9!S04..0117 FAX(l60) 438-7743 TABLE OF CONTENTS 2 Page 3 INTRODUCTION .................................................................................................................................. I 4 I. AUTHORITY, JURISDICTION, AND VENUE .................................................. : ......................... .3 5 II. DEFINITIONS ................................................................................................................................... 4 6 HI. DESCRIPTION OF FACILITY CONDITIONS .............................................................................. 5 7 IV. DESCRIPTION OF PROPOSED PROJECT .................................................................................. 9 8 V. WORK.TO BE PERFORMED ............................................................................. · .......................... ! I 9 VI. ECOLOGY COSTS ....................................................................................................................... 11 IO vn. DESIGNATED PROJECT COORDINATORS ........................................................................... 12 11 VIII. PERFORMANCE ....................................................................................................................... 13 I 2 IX. CERTIFICATIONS ....................................................................................................................... 13 13 X. PARTIES BOUND; CONVEYANCE OF PROPERTY ................................................................ 14 14 XI. AMENDMENT OF CONSENT DECREE; ADDING NEW PARTIES TO DECREE ............. 15 15 XII. DISPUTE RESOLUTION ............................................................................................................ 16 16 XIII. CONTRIBUTION PROTECTION ............................................................................................. 17 17 XIV. COVENANT NOT TO SUE; REOPENERS ............................................................................. 17 18 XV. RESERVATION OFRIGHTS ..................................................................................................... 19 19 XVI. DISCLAIMER ............................................................................................................................ 19 20 XVII. RETENTION OF RECORDS ................................................................................................... 19 21 XVIII.PROPERTY ACCESS ............................................................................................................. 19 22 XIX. COMPLIANCE WITH OTHER APPLICABLE LAWS ............................................................ 20 23 XX. SAMPLING, DATA REPORTING, AND AVAILABILITY ..................................................... 21 24 XXI. PROGRESS REPORTS .............................................................................................................. 22 25 XXII. EXTENSION OF SCHEDULE ..................................................... : ........................................... 22 26 xxm. ENDANGERMENT ................................................................................................................. 24 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter i ATTORNEY GENEJ<AL OF WASHINGTON Ecology Divi!ion PO Box 40117 Olymp;., WA 91S04.0117 FAX (360} 438-770 xxrv. PERIODIC REVIEW ............................................................................................................... 25 2 XXV. CERTIFICATION OF COMPLETION AND DELISTING ..................................................... 25 3 XXVI. INDEMNIFICATION AND.HOLD HARMLESS .................................................................. 25 4 XXVII. CLAIMS AGAINST THE STATE ......................................................................................... 26 5 XXVIII. PUBLIC PARTICIPATION .................................................................................................. 26 6 XXIX. DURATION OF DECREE AND RETENTION OF JURISDICTION ................................... 26 7 XXX. PUBLIC NOTICE AND WITHDRAW AL OF CONSENT ..................................................... 26 . 8 XXXI. SEVERABILITY ................................................................................................. : ................... 27 9 XXXII. EFFECTIVE DATE ................................................................................................................ 27 10 ATIACHMENT A-Description of Property 11 ATTACHMENT B -Cleanup Action Plan 12 ATTACHMENTC-Restrictive Covenant 13 A TI ACHMENT D-Site Map of Property to be Acquired by Port Quendall Company 14 A TI ACHMENT E -Form Notice of Proposed Successors in Interest and Assigns 15 A TI ACHMENT F -Form Agreement of Successors in Interest and Assigns 16 A TI ACHMENT G-Public Participation Plan 17 A TI ACHMENT H-SEPA Mitigated Determination ofNonsignificance and Environmental Checklist 18 19 20 21 22 23 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter ll ATTORNEY GENERAL OF WASHINGTON Ecology DiviOOfl PQBox40117 Olympia, WA 98504·0117 FAX ()60) 438-774) 2 3 4 5 6 7 8 INTRODUCTION This Prospective Purchaser Consent Decree ("Decree") is made and entered into by and between the Washington State Department of Ecology ("Ecology") and Port Quendall Company, a Washington corporation ("PQC"). Qualified Successors in Interest and Assigns may become parties to this Decree as provided in Section XI. I. WHEREAS, the purpose of this Decree is to: (I) resolve the potential liability of Defendant for the present contamination arising out of past activities associated with the Facility, including the contamination associated with the "South Baxter Property" described in Section Ill and 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Attachment A herein, and has thereafter been deposited, stored, disposed of, placed, or otherwise come to be located within the Facility; (2) promote the public interest by expediting cleanup activities at the Facility; and (3) facilitate the reuse of a currently vacant parcel of land. 2. WHEREAS, the South Baxter Property currently is owned by J. H. Baxter & Co., a California limited partnership ("J. H. Baxter''). 3. WHEREAS, the Facility is listed on the Washington Hazardous Sites List with a site hazard ranking of 1. 4. WHEREAS, PQC has entered into a Property Purchase Agreement with J. H. Baxter to purchase the South Baxter Property which is comprised of one parcel totaling approximately 7 acres and is described on Attachment A. 5. WHEREAS, final entry of this Consent Decree is a condition of the Property Purchase Agreement necessary in order for the purchase to close. 6. WHEREAS, Defendant proposes to facilitate construction of mixed commercial, residential, and/or retail development on the South Baxter Property by performing remedial actions as more fully described in Attachment B (Cleanup Action Plan). 7. WHEREAS, Defendant is simultaneously entering into a Consent Decree with respect to the purchase of property inunediately north of the Facility (the "North Baxter Property"). The PROSPECTIVE PURCHASER CONSENT DECREE South Baxter A TIORNEY GENERAL Of WASHINGTOl'I Ecology Division PO Box 40117 Olympia, WA 98504--0117 FAX (360) 418,774) North Baxter Property is also owned by J.H. Baxter and has in the past operated in conjunction with 2 the Facility. Ecology has determined that the North Baxter Property is a separate facility and is thus 3 addressed in a separate Consent Decree. 4 8. WHEREAS, in the absence of this Decree, at the time it acquires the South Baxter 5 Property, PQC would incur potential liability at the Facility to the state of Washington and/or third 6 parties under the Model Toxics Control Act ("MICA''), Chapter 70.105D RCW, as an 7 owner/operator due to releases or threatened releases of Hazardous Substances, Pollutants, or 8 Contaminants at the Facility. 9 9. WHEREAS, Ecology does not intend to provide a defense to Defendant to any · IO liability for releases or threatened releases of Hazardous Substances caused or contributed to by 11 Defendant. 12 10. WHEREAS, the Washington State Department of Natural Resources ("DNR") owns 13 submerged lands offshore of the South Baxter Property, including lands which were leased to prior 14 operators of the Property and which were allegedly contaminated by prior activities at the Baxter 15 Property. 16 17 I !. 12. WHEREAS, the DNR has received notice of this Consent Decree. WHEREAS, this Decree promotes the public interest by facilitating use of the South 18 Baxter Property. 19 13. WHEREAS, Defendant has offered to further certain Ecology goals as provided in 20 this Decree in exchange for a covenant not to sue and protection from contribution for contamination 21 at the Facility. 22 14. WHEREAS, Defendant has certified that its plans for the South Baxter Property are 23 not likely to aggravate or contribute to contamination at the Facility, interfere with remedial actions 24 that may be needed at the Facility, or increase human health risks to persons at or in the vicinity of 25 the Facility. 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 2 A TIORNEY GENERAL OF WASHINGTON Ecology Di\1si01) PO Box 40117 Otympia, WA 98504--0117 FAX (360) 438-7743 15. WHEREAS, this Decree will provide a substantial public benefit by promoting reuse 2 of a currently vacant parcel ofland, providing substantial economic, community, and transportation 3 benefits to the area, and yielding substantial resources for environmental remediation. 4 16. WHEREAS, the Court is fully advised of the reasons for entry of this Decree and 5 good cause having been shown: 6 IT IS HEREBY ORDERED, ADJUDGED, AND DECREED AS FOLLOWS: 7 I. AUTHORITY, JURISDICTION, AND VENUE 8 9 17. This Court has authority to resolve the liability of the parties to this Decree. 18. This Court has jurisdiction over the subject matter and over the parties pursuant to 10 MTCA. Venue is proper in King County pursuant to RCW 70.105D.050(5)(b). 11 19. Authority for entry of this Decree is conferred by RCW 70.105D.040(4) and 12 70.105D.040(5), which authorize the Washington State Attorney General to agree to a settlement 13 with a prospective purchaser of a facility if, after public notice and hearing, Ecology finds the 14 proposed settlement would lead to a more expeditious cleanup of hazardous substances in 15 compliance with cleanup standards adopted under RCW 70.1 OSD.030(2)( d). RCW 70.105D.040( 4) 16 and 70.IOSD.040(5) require that such a settlement be entered as a Consent Decree issued. by a court 17 · of competent jurisdiction. 18 20. Ecology finds that the proposed settlement would lead to a more expeditious cleanup 19 of hazardous substances in compliance with cleanup standards adopted under RCW 20 70.1 OSD.030(2)( d) and that there are no "unique circumstances" as that term is defined in RCW 21 70.105D.040( 4)( e )(ii). 22 21. Ecology has.listed the facility on the Washington Hazardous Sites List. Ecology has 23 not made a determination that PQC is a Potentially Liable Person ("PLP") for the Facility. However, 24 if PQC was to acquire an interest in the Facility without this Decree, it would become a PLP under 25 RCW 70.105D.040(l)(a). This Decree is entered before PQC acquires the South Baxter Property to 26 PROSPECTNE PURCHASER CONSENT DECREE South Baxter 3 ATIORNEYGENER.ALOFWASHINGTON Ecology Division P0Box40lli Olympia,. WA 98$04-011 7 FAX (360) 438-7743 . I resolve PQC's potential liability at the Facility to the state of Washington and/or third parties for the 2 present contamination arising out of past activities associated with the Facility, including the 3 contamination associated with activities at the Facility that has been deposited, stored, disposed of, 4 placed, or otherwise come to be located within the Facility and to facilitate a more comprehensive 5 and expeditious cleanup than otherwise would occur. 6 22. By entering into this Decree, Defendant agrees not to challenge Ecology's jurisdiction 7 in any proceeding to enforce this Decree. Defendant consents to the issuance of this Decree and has 8 agreed to perform the terms of the Decree, including remediation, monitoring, and payment of 9 oversight costs as specified in this Decree. 10 11. DEFINITIONS 11 23. Whenever terms listed below are used in this Decree or in the attachments hereto, the 12 following definitions shall apply: 13 a. "Baxter Cove" shall mean the shallow cove or inlet portion of Lake 14 Washington that received discharges from Baxter Lagoon, as generally depicted on Attachment D. 15 b. "Baxter Lagoon" shall mean the depression on the South Baxter Property that 16 was formerly used for skimming and settling of process and stonnwater prior to discharge to Lake 17 Washington, as generally depicted on Attachment D. 18 19 C. d. The "South Baxter Property" is described in Attachment A attached hereto. "Cleanup Action Plan" shall mean the Cleanup Action Plan, including the 20 final Baxter Mitigation Analysis Memorandum and other attachments thereto, dated 4/4/00 , 21 attached to this Decree as Attachment B. 22 e. "Decree" shall mean this Decree and all attachments hereto. ln the event of a 23 conflict between this Decree and any attachment, this Decree shall control. 24 25 26 f. "Defendant" shall mean Port Quendall Company, a Washington corporation. PROSPECTTVE PURCHASER CONSENT DECREE South Baxter 4 ATTORNEY GENERAL OF WASlUNGTON Etology Division PO Box40117 Olympia. WA 98SCM-Ol 17 FAX (360) ,,s.7743 g. "Facility" shall mean the South Baxter Property, as described on Attachment 2 A, including the portion of the DNR-owned submerged lands shown on Attachment D. 3 h. "Hazardous Substance" shall have the meaning defined in MTCA, RCW 4 70. IOSD.020(6). 5 I. "Paragraph" shall mean a portion of this Decree identified by an Arabic 6 numeral. 7 J. "Section" shall mean a portion of this Decree identified by a Roman numeral 8 and including one or more Paragraphs . 9 k. "Successors in Interest and Assigns" shall mean any person who acquires an IO interest in the Property through purchase, lease, transfer, assignment, or otherwise, including those 11 who become a party to this Decree pursuant to Section XI. 12 III. DESCRIPTION OF FACILITY CONDITIONS 13 24. The South Baxter Property, known as the South J. H. Baxter Property/Renton ("South 14 Baxter Property''), is located at 5015 Lake Washington Boulevard North on the eastern shore of Lake · 15 Washington in the northeastern portion of the City of Renton, in King County, Washington, as set 16 forth in Attachment A. The South Baxter Property occupies approximately 7 acres, three miles south 17 of the junction of Interstate Highways 405 and 90. The South Baxter Property is relatively flat and is 18 situated within the northern portion of a roughly 70-acre alluvial plain bordering the Lake 19 Washington shoreline. The Quendall Terminals property is located directly to the south of the 20 Property. Further to the south is property currently occupied by the Barbee Mill. Interstate 405 is 21 approximately 500 feet to the east. 22 25. The South Baxter Property is bordered to the north by the North Baxter Property. The 23 North and South Baxter Properties have been determined to be separate facilities based on historic 24 operations, previous studies and previous correspondence and agreements between J. H. Baxter and 25 Ecology, which defined a "Line of Demarcation" between the two Properties. The line of 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 5 /\ TIORNEY GENERAL OF WASHINGTON Ecology Di11ision P0Box~l17 Olympia. WA 98504:-0117 FAX (360) 43$-7743 Demarcation was originally defined in the Renton-Baxter Remediation Security Interest Agreement 2 dated May 6, 1992 and subsequent Ecology correspondence. PQC and J.H. Baxter have submitted a 3 lot line adjustment application to formally segregate the North and South Baxter Properties. This 4 Consent Decree addresses the South Baxter Property. A separate Consent Decree, entered 5 simultaneously with this Consent Decree, addresses the North Baxter Property. 6 26. In 1873, Jeremiah Sullivan obtained all properties on the May Creek Delta (Baxter, 7 Quendall Terminals, Pan Abode, Barbee Mill) from the U.S. government and sold them in 1875 to 8 James M. Colman. In 1902, the timber on the subject parcels was sold, and in 1903, a right-of-way 9 was deeded to Northern Pacific. The Northern Pacific rail line later became the Burlington Northern IO Santa Fe rail line which currently abuts the Baxter Property. 11 27. The four properties remained within the Colman family through at least 1908, when 12 ownership of the subject parcels began to diverge. Peter Reilly took title to most of the waterfront 13 parcels in March of 1916. Between July and October of 1916, the U.S. Army Corps of Engineers 14 completed the Lake Washington Ship canal, which lowered the level of Lake Washington by 15 approximately 8 feet (U.S. Geological Survey, 1983). This increased the land area of the waterfront 16 parcels, by exposing formerly submerged portions of the May Creek Delta. 17 28. The J. H. Baxter wood treating plant was built in 1955 upon the deltaic deposits of 18 May Creek exposed by the lowering of Lake Washington. Wood treating operations were 19 discontinued in 1981. Prior to 1955 there is no known record of industrial or commercial activity on 20 the site. Currently, all of the former wood treating equipment has been removed. 21 29. During the years of operation, the J. H. Baxter plant primarily used the Boulton 22 process to treat wood. Although butt tanks were used for some preservative applications, the plant 23 principally used single pressure vessels (retorts) to treat wood. Generally, pentachlorophenol was 24 used to treat poles and creosote was used to treat pilings. 25 26 PROSPECTNE PURCHASER CONSENT DECREE South Baxter 6 A TIORNEY GENERAL Of WASHING TON Ecology Division PO Box 401 l 1 Olympia, WA 98504-01 I 7 FAX (360) 438-7743 30. The North Baxter Property was used principally for storage of untreated poles and 2 pilings. Wood was stored on site as part of inventory and to facilitate drying prior to treatment. 3 Treated wood was routinely produced upon demand and was temporarily stored on the South Baxter 4 Property prior to shipment by truck or rai I. 5 31. . The majority of the waste produced by J. H. Baxter between 1955 and 1981 was 6 process water sludges contaminated by pentachlorophenol and creosote. This process water was 7 generated from condensates and blowdown, and was evaporated in a cooling tower. Sludges were 8 produced as a result, and these were disposed of by J. H. Baxter in a class-I landfill in Oregon. 9 32. The Baxter facility maintained a waste discharge pennit (1965) and NPDES permit · 10 (1971) for surface water discharge to Lake Washington. Surface water was collected in a depression 11 ("Baxter La~oon"), on the southern portion of the site prior to discharge. A separating tank and a 12 skimming and settling pond were established to remove potential oil components prior to discharge. 13 A drainage line from the benned tankage area was occasionally opened to release storm water which 14 accwnulated in the containment area 15 33. · During the course of plant operation, five to 11 aboveground storage tanks of varying 16 capacities were located near the operations buildings in the tank farm. The tank farm was contained 17 with a concrete slab and berm. Wood preserving chemical~ stored in the tank farm included 18 crystalline PCP, aromatic carrier oils, 5 percent PCP in solution, and creosote. 19 34. Based upon historical usage of chemicals at the site as well as analytical· data 20 available from site investigation activities, the compounds of concern at the Facility are 21 pentachlorophenol (PCP) and polycyclic aromatic hydrocarbons (PAHs). These compounds are 22 known to exist in both soil and groundwater at the site as well as in sediments of Baxter Cove. 23 35. While dioxin/furan isomers were detected, in general, only more chlorinated, less 24 toxic compounds were encountered at this site (Woodward Clyde, 1990). Removal of source area 25 PAH and PCP, capping of residual soil impacts, and implementation of purchaser's development 26 PROSPECTrYE PURCHASER CONSENT DECREE South Baxter 7 A TIORNEY GENERAL OF WASHINGTON Ecology Division P0Box401J7 01)-rnpia., WA 98S04..0l 17 FAX(360) 438-770 controls (clean soil cover and/or development features) are expected to sufficiently address any 2 concerns related to dioxins. 3 36. The areas of highest soil impacts coincide with the approximate locations of former 4 operations. In sampling locations in the former operation areas, concentrations tend to decrease with 5 depth. However, in locations downgradient of the former operation areas (e.g., BAX-6), soil impacts 6 are generally associated with the water table. 7 37. Past activities at the Facility have also resulted in impacts to groundwater quality. 8 Chemical compounds detected in groundwater include PAHs and PCP, which appear to be 9 associated with former operation areas. Carcinogenic PAHs (CPAHs) were detected in several wells 10 prior to 1990, but were only detected in wells BAX-I and BAX-14 in 1990. These wells are located 11 in areas associated with former operations. No carcinogenic PAHs were detected in wells located 12 near the shore (BAX-6, BAX-SA or BAX-SB), the only wells sampled in the most recent sampling 13 events in October 1998 and January 2000. 14 38. Areas of non-aqueous phase liquid (NAPL) are present at the Facility. The NAPL 15 areas are generally located in the vicinity of former operations on the Facility. 16 39. Former activities at the Facility have resulted in impacts to the adjacent sediments 17 pr~dominantly on the fee-owned aquatic lands that are part of the Facility. Sediment samples 18 collected in Lake Washington near the Facility confirm that PAH and PCP contamination is 19 restricted to the interior of Baxter Cove. 20 40. Several investigations of potential contamination have been performed on the Facility 21 beginning in 1983 with an offshore sediment investigation of potential hazardous substances and a 22 subsurface hazardous waste investigation. In November, 1988, a Consent Decree was entered into 23 by J. H. Baxter and Ecology for the purpose of conducting a preliminary Remedial Investigation (RI) 24 under the Model Toxics Control Act (MTCA)(No. 88-2-21599-5). The Consent Decree led to a 25 Renton-Baxter Security Interest Agreement dated May 6, 1992, which provided that the North Baxter 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 8 ATIORNEYGENEJV.LOFWASHINGTON Ecokigy Division PO Oox 40117 Olympia, WA '98S04-0t 17 FAX ('.l60) 433.7743 Property would act as security for certain South Baxter Property cleanup obligations. Upon entry of 2 this Consent Decree, Consent Decree No. 88-2-21599-5 shall be superseded and of no further force 3 and effect, and the May 6, 1992 Renton-Baxter Security Interest Agreement will be released and of 4 no further force and effect. Comprehensive summaries of project area historical information, records 5 and environmental data have been provided in the Draft Remedial Investigation Report (Woodward 6 Clyde, l 990) conducted pursuant to the l 988 Consent Decree, and in multiple documents prepared 7 by Thermo~etec Consulting Corporation from 1997 to present. 8 9 10 II 12 13 14 15 16 17 IV. DESCRIPTION OF PROPOSED PROJECT 41. Defendant proposes to acquire the South Baxter Property (along with the North Baxter Property) to facilitate eventual commercial, urban residential, and/or retail development, either independently or as the northern portion of the potential Quendall Landing Development Project ("Project"), including adjacent properties, which could ultimately result in between approximately 400,000 and 3.0 million square feet of development at the north end of Renton. The_ South Baxter Property, along with the North Baxter Property is anticipated to include approximately 400,000 sq. ft. of development. 42. In 1989, the City of Renton began work on development of a Comprehensive Plan affecting the Property and surrounding properties. Between 1990 and 1993, extensive public 18 19 20 21 22 23 24 25 26 hearings and meetings were held, and notification was provided to impacted property owners and the general public concerning Comprehensive Plan land use alternatives and proposed Renton Zoning Code amendments. 43. In addition, in 1996 and 1997, an Environmental Impact Statement ("EIS") scoping process was conducted in association with proposed development of the Facility. This EIS scoping process involved significant public participation, including mailings, formal comment, and public meetings. PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 9 A TIORNEY GENERAL Of WASHINGTON Ecology Division P0Box40ll7 CMympia. WA 98$04-0117 FAX (360) 438· 7743 44. Any property development will be completed in accordance with the Renton 2 Comprehensive Plan and area-wide zoning Center Office Residential designation. Subject to the 3 requirements of the Baxter Mitigation Analysis Memorandum, such development will include 4 permanent public access to shoreline at the Baxter Property. 5 45. Any residential townhomes or condominiums on the South Baxter Property will be 6 built over structural concrete parking or other structures, placing the first occupied floor at least one 7 level above the soil. 8 46. Two office buildings (approximately 200,000 square feet each) and associated 9 parking may be located on the South Baxter Property. Th~ proposed buildings are anticipated to be IO five stories, or approximately 68 feet tall. Parking may be located as the first floor of the office 11 building or as separate structures. 12 47. The development would be designed to take advantage of the desirable location of 13 the South Baxter Property and will minimize adverse envirorunental impacts. Redevelopment will 14 facilitate permanent public access to the shoreline (through a gravel walking trail on the inland edge 15 of shoreline enhancements and observation stations), create a connection to existing recreational use 16 trails, and create transportation and parking improvements. 17 48. Development of the South Baxter Property is expected to create a significant number 18 of well-paying jobs and spur development in the north end of Renton. Substantial tax revenues 19 would be generated to benefit Renton and the state of Washington. 20 . 49. Defendant has complied with the State Envirorunental Policy Act ("SEP A") 21 environmental review requirements for the proposed remedial actions to be performed. Ecology has 22 been established as the agency lead pursuant to SEP A. The SEP A Mitigated Determination of 23 Nonsignificance and Environmental Checklist are attached as Attachment H. 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 10 ATTORNEY GENERAL Of WASHINGTON Ecology Division PO Box,40117 Olympia, WA 98S04.()117 FAX (360) <)S-7743 V. WORK TO BE PERFORMED 2 50. Upon the Effective Date of this Decree, Defendant will perform the Cleanup Action 3 Plan described in Attachment B, including all attachments thereto, according to the schedule 4 provided therein. Defendant shall submit as-built documentation to Ecology to verify construction of 5 the cleanup and mitigation actions required by the Cleanup Action Plan. Cleanup activities include 6 source remediation, site grading to facilitate site redevelopment, soil capping, wetland mitigation, 7 and confirmational groundwater monitoring. Source remediation includes removal ofNAPL from g wells (BAX-14), sediment and soil excavation and off-site treatment or disposal, and in situ soil 9 mixing (stabilization). Source remediation activities will occur at prescribed locations according to Jo the Cleanup Action Plan. Coordination between site cleanup and redevelopment would minimize J J disruption to the surrounding community. As such, the actual schedule for site cleanup may vary to J 2 facilitate this coordination. 13 51. Defendant agrees not to perform any remedial actions for the release of Hazardous J 4 Substances covered by this Decree, other than those required by this Decree, unless the parties agree J 5 to amend the Decree to cover those actions. All work conducted under this Decree shall be done in. 16 accordance with Chapter 173-340 WAC unless otherwise provided herein. All work conducted 17 pursuant to this Decree shall be done pursuant to the cleanup levels specified in the Cleanup Action 18 Plan (Attachment B). 19 52. Defendant agrees to record the Restrictive Covenant (Attachment C) with the Office 20 of the King County Recorder upon completion of the capital portion of the Cleanup Action Plan and 21 shall provide Ecology with proof of such recording within thirty (30) days of recording. 22 VI. ECOLOGY COSTS 23 53. Defendant agrees to pay all oversight costs incurred by Ecology pursuant to this 24 Decree. TIJ.is oversight payment obligation shall not include costs already paid pursuant to the 25 Prepayment Agreement entered between Ecology and JAG Development Inc. dated October 2, 1996. 26 The oversight costs required to be paid under this Decree shall include work performed by Ecology PROSPECTIVE PURCHASER CONSENT DECREE South Baxter II ATIORNEY GENERAL Of WASHINGTON E.cology Division PO Box40117 Olympia. WA 98S04-0117 FAX {3«>) 433.7743 or its contractors for, or on, the Facility under Chapter 70.105D RCW, both before and after the 2 issuance of this Decree, for Decree preparation, negotiations, and administration. Ecology oversight 3 costs shall be calculated pursuant to WAC 173-340-550(2) and shall include direct staff costs, an 4 agency support cost multiplier, and a program support cost multiplier for all oversight costs. 5 54. Defendant agrees to pay Ecology oversight costs within ninety (90) days of receiving 6 from Ecology an itemized statement of costs that includes a summary of costs incurred, an 7 identification of involved staff, and the amount of time spent by involved staff members on the 8 project. Ecology shall, upon request, provide Defendant with a general statement of work 9 performed. Ecology shall prepare itemized statements of its oversight costs quarterly. Failure to pay l O Ecology's costs within ninety (90) days of receipt of the itemized statement will result in interest 11 charges at the rate of twelve ( 12) percent per annum. 12 55. In the event Defendant disputes expenditures or the adequacy of documentation for 13 which reimbursement is sought, the parties agree to be bound by the dispute resolution process set l 4 forth in Section XII. 15 VII. DESIGNATED PROJECT COORDINATORS 16 17 18 19 20 21 22 23 24 25 26 56. The project coordinator for Ecology is: Gail Colbwn Toxics Cleanup Program Department of Ecology Northwest Regional.Office 3l90-160th Avenue SE Bellevue, WA 98008-5452 (206) 64 9-7265 The project coordinator for Defendant is: Grant Hainsworth ThermoRetec Consulting Corporation 1011 SW Klickitat Way, Suite 207 Seattle, WA 98134 57. Each project coordinator shall be responsible for overseeing the implementation of this Decree. The Ecology project coordinator will be Ecology's designated representative at the PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 12 A TIORNEY GENERAL Of WASHINGTON Ecology Division PO Box40117 Olympia. WA 9U04-01 J7 FAX ()60)438-7743 Property. To the maximum extent possible, communications between Ecology and Defendant and 2 all documents, including reports, approvals, and other correspondence concerning the activities 3 performed pursuant to the terms and conditions of this Decree, shall be directed through the project 4 coordinators. The project coordinators may designate, in writing, working-level staff contacts for all 5 or portions of the implementation of Section V of this Decree, including the Cleanup Action Plan, 6 incorporated in this Decree as Attachment B. The project coordinators may agree to minor 7 modifications to the work to be performed without fonnal amendments to this Decree. Minor 8 modifications will be documented in writing by Defendant and approved by Ecology. 9 58. Any party may change its respective project coordinator. Written notification shall be 10 given to the other party at least ten (I 0) days prior to the change. 11 VIII. PERFORMANCE 12 59. All work performed pursuant to this Decree shall be under the direction and 13 supervision, as necessary, of a professional engineer or hydrogeologist, or equivalent. Any 14 construction work must be under the supervision of a professional engineer. Defendant shall notify 15 Ecology in writing as to the identity of such engineer(s) or hydrogeologist(s) or·others and of any 16 contractor(s) and subcontractor(s), including the contractor responsible for installation of required 17 mitigation actions, to be used in carrying out the terms of this Decree in advance of their 18 involvement at the Facility. 19 IX. CERTIFICATIONS 20 60. Defendant certifies that, to the best of its knowledge and belief, it has fully and 21 accurately disclosed to Ecology the information currently in its possession that relates to the 22 environmental conditions at the Facility, or to Defendant's right and title thereto. 23 61. Defendant represents and certifies that, to the best of its knowledge, it is not aware of 24 any facts that would give rise to liability to it under RCW 70. IOSD.040 prior to acquisition of the 25 Baxter Property. 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 13 A TIORNEY GENERAL OF·WASHINGTOH Ecology Division P08ox40111 Olymp'1. WA 98504-0117 FAX (JW) 4)8.7743 62. Defendant represents and certifies its belief that redevelopment of the South Baxter 2 Property is not likely to contribute to the existing release or threatened release of Hazardous 3 Substances from the Facility, interfere with future remedial actions that may be needed at the 4 Facility, or increase health risks to persons at or in the vicinity of the Facility. 5 63. If any certification provided by Defendant pursuant to this Section is not true, the 6 Covenant Not To Sue in Section XIV shall not be effective with respect to Defendant, and Ecology 7 reserves all rights it may have against Defendant. 8 X. PARTIES BOUND; CONVEYANCE OF PROPERTY 9 64. The restrictions, obligations, and rights set forth in this Decree shall be binding upon IO the parties to this Decree. Qualified Successors in Interest and Assigns may become parties to this 11 Decree at the option of Defendant, by following the amendment procedures set forth in Section XI. 12 65. Defendant shall implement contractual provisions that require all Successors in 13 Interest and Assigns to this Decree to comply with the applicable provisions of this Decree. 14 66. If proposed Successors in Interest and Assigns wish to become a party to this Decree, 15 Defendant and the proposed transferee(s) shall notify Ecology and the Attorney General's office of 16 the proposed transfer, the name of the proposed transferee(s), and the proposed transferee(s) intended 17 use of the South Baxter Property. The notification required by this Paragraph shall occur at least 30 18 days before the date of a proposed transfer of interests. Such notification shall be in the form of 1. 9 Attachment E to this Decree. 20 67. In the event Defendant assigns all of its fee interest to a Successor in Interest or 21 Assign, and that Successor in Interest or Assign becomes a party to this Decree, at Ecology's sole 22 discretion and with its concurrence, Ecology shall thereafter look first to such successor for 23 performance of the requirements of this Decree, including, but not limited to, performance of the 24 work as described in Section V, and payments of Ecology costs described in Section VI. 25 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 14 ATTORNEY GENERAL OF WASHINGTON Ecology Division P0Sox40117 Olympia, WA 98$04-0117 FAX (360) 438-7743 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 68. Defendant shall further provide 30 days advance written notice to Ecology of Defendant's intent to convey any fee interest in a substantial portion of the South Baxter Property. No conveyance of title in the South Baxter Property shall be consummated by Defendant without adequate provision for continued monitoring, operation and maintenance of the remedial actions called for in this Decree. Failure of the Defendant or the proposed transferee to time!)' comply with this Section's notification requirements does not in any way alter the rights and obligations of such party as set forth in this Decree. XI. AMENDMENT OF CONSENT DECREE; ADDING NEW PARTIES TO DECREE 69. Tilis Decree may only be amended by a written stipulation among the parties to this Decree that is thereafter entered and approved by order of the Court. Such amendment shall become effective upon entry by the Court, or upon a later date if such date is expressly stated in the parties' written stipulation or the Court so orders. 70. Amendments may cover any subject or be for any purpose agreed to by the parties to this Decree. If Ecology determines that the subject of an amendment requires public input, Ecology shall provide thirty (30) days' public notice prior to seeking entry of the amendment by the Court. 71. Whenever the Defendant contemplates conveying an interest in the Property to a proposed Successor in Interest and Assign, the proposed Successors in Interest and Assigns may request that the Decree be amended as provided for in this paragraph. The amendment to the Decree shall ~e in the form of Attachment F, "Agreement of Successors in Interest and Assigns." Ecology may withhold consent to an amendment making proposed Successors in Interest and Assigns a party to this Decree only if Defendant or its Successors in Interest and Assigns is in violation or will be in violation of a material term of this Decree. 72. The parties contemplate that various interests in the South Baxter Property may be granted to parties who will become "Successors in Interest and Assigns", but who choose not to become parties to this Decree. Examples include tenants leasing space in completed buildings, PROSPECTIVE PURCHASER CONSENT DECREE South Baxter IS ATIORNEY GENERAL OF WASHINGTON Eeology DlvisioR PO Box.40117 Olympia. WA 98S04·0117 FAX (360)438-7743 lenders taking a security interest in all or a portion of the South Baxter Property and persons 2 obtaining limited possessory rights in the South Baxter Property. Nonetheless, such parties will be 3 entitled to the protections, if any, afforded by RCW 70.105D.040(4)(e) and (f). 4 XII. DISPUTE RESOLUTION 5 73. In the event a dispute arises as to an approval, disapproval, proposed modification, or 6 other decision or action by Ecology's project coordinator pertaining to implementation of the 7 Cleanup Action Plan, the parties shall use the dispute resolution procedure set forth below. 8 a. Upon receipt of the Ecology project coordinator's written decision, Defendant 9 has fourteen (14) days within which to notify Ecology's project coordinator of any objection to the IO decision. 11 b. The parties' project coordinators shall then confer in an effort to resolve the· 12 dispute. If the project coordinators cannot resolve the dispute within fourteen (14) days following 13 the conference, Ecology's project coordinator shall issue a written decision. 14 c. Defendant may then request Ecology management review of the decision. 15 This request shall be submitted in writing to the Toxics Cleanup Program Northwest Region 16 Manager within seven (7) days of receipt of Ecology's project coordinator's written decision. 17 d. Ecology's Toxics Cleanup Program Northwest Region Manager shall conduct 18 a review of the dispute and shall issue a written decision regarding the dispute within thirty (30) days 19 of the Defendant's request for review. The Toxics Cleanup Program Northwest Region Manager's 20 decision shall be Ecology's final decision on the disputed matter. 21 74. If Ecology's final written decision is unacceptable to Defendant, Defendant has the 22 right to submit the dispute to the Court for resolution. The parties agree that one judge should retain 23 jurisdiction over this case and shall, as necessary, resolve any dispute arising under this Decree. For 24 disputes concerning Ecology's investigative and remedial decisions that arise under this Decree, the 25 Court shall review the actions or decisions of Ecology under an arbitrruy and capricious standard. 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 16 A TT OR.NEV GENERAL OF WASHINGTON Ecology Division PO Box 401 t7 Olympia, WA 98S04-0l 17 FAX (360) 411-7743 75. The parties may mutually agree to substitute an Alternative Dispute Resolution 2 (ADR) process, such as mediation, for the fonnal dispute resolution process set forth in this Section. 3 76. The parties agree to use the dispute resolution process in good faith and agree to 4 expedite, to the extent possible, the dispute resolution process whenever it is used. When either 5 party uses the dispute resolution process in bad faith or for purposes of delay, the other party may 6 seek sanctions. 7 77. The implementation of these dispute resolution procedures shall not provide a basis 8 for delay of any activities required in this Decree, unless Ecology agrees in writing to a schedule 9 extension or the Court so orders. 10 78. The parties agree that this Decree is not intended to alter any evidentiary burdens of 11 either party in any proceeding by Ecology for costs or claims involving the South Baxter Property. 12 XIII. CONTRIBUTION PROTECTION 13 79. With regard to claims for contribution against Defendant, the parties intend that 14 Defendant will obtain the protection against claims for contribution for matters addressed in this 15 Decree pursuant to MTCA, RCW 70.105D.040(4)(d). 16 XIV, COVENANT NOT TO SUE; REOPENERS 17 80. In consideration of Defendant's compliance with the tenns and conditions of this 18 Decree, Ecology agrees that compliance with this Decree shall stand in lieu of any and all 19 administrative, legal, and equitable remedies and enforcement actions ("Actions") available to the 20 state against Defendant or Successors in Interest for releases or threatened releases of Hazardous 21 Substances at the Facility, provided such Actions pertain to Hazardous Substances which Ecology 22 knows or believes to be located at the Facility as of the date of this Decree. This covenant is strictly 23 limited to the Facility as defined in Section II ofthis Decree and shown on Attachment D. 24 25 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 17 AITORNEY GENERAL OF WASHINGTON Ecology Division POBo,;40!17 Olympia. WA 98S04-0117 FAX ()60) 438-7743 81. Reopeners: In the following circumstances, Ecology may exercise its full legal 2 authority to address releases of Hazardous Substances at the Facility, notwithstanding the Covenant 3 Not To Sue set forth above: 4 a. In the event Defendant fails to comply with the terms and conditions of this 5 Decree, including all attachments, and after written notice of noncompliance, such failure is not 6 cured by such Defendant within sixty (60) days of receipt of notice of noncompliance. 7 b. In the event factors not known at the time of entry of this Agreement and not 8 disclosed to Ecology are discovered and such factors present a previously unknown threat to human 9 health or the environment and are not addressed by the Cleanup Action Plan (Attachment B). If such IO factors are discovered, Ecology shall give written notice to Defendant. Defendant will have sixty 11 (60) days from receipt of notice to propose a cure to the condition giving rise to the threat. If such 12 cure is acceptable to Ecology, Defendant and Ecology will negotiate an appropriate timetable for 13 implementation. 14 c. Upon Ecology's determination that actions beyond the terms of this Decree 15 are necessary to abate an emergency situation which threatens public health, welfare, or the 16 environment. 17 82. Applicability: The Covenant Not to Sue set forth above shall have no applicability 18 whatsoever to: 19 20 21 22 83. a Criminal liability. b. Actions against PLPs not party to this Decree. C. Liability for damages for injury to, destruction of, or loss of natural resources. Ecology retains all of its legal and equitable rights against all persons, except as 23 otherwise provided in this Decree. 24 25 26 PROSPECTfVE PURCHASER CONSENT DECREE South Baxter 18 A ITORNEY OENEP..AL OF WASHINGTON Ecology Division PO Bo:ic 40117 Ol~ia, WA 98S04.0l 17 FAX (;\60) 4)8,.7743 XV. RESERVATION OF RIGHTS 2 84. Defendant reserves all rights and defenses which it may have and which are not 3 otherwise addressed in this Decree, including the right to seek contribution or cost recovery for funds 4 expended pursuant to this Decree, subject to the limitations in Section XXVII. 5 85. Except as provided herein for the parties, this Decree does not grant any rights or 6 affect any liabilities of any person, finn, or corporation or subdivision or division of state, federal, or 7 local government. 8 XVI. DISCLAIMER 9 86. This Decree does not constitute a representation by Ecology that the Property is fit for IO any particular purpose. 11 XVII. RETENTION OF RECORDS 12 87. Defendant shall preserve, during the-pendency of this Decree and for ten (10) years 13 from the date this Decree is no longer in effect as provided in Section XXIX, all records, reports, 14 documents, and underlying data in its possession relevant to the implementation of this Decree and 15 shall insert in contracts with project contractors and subcontractors a similar record retention 16 requirement. Defendant shall retain all monitoring data so long as monitoring is ongoing as provided 17 in the Cleanup Action Plan (Attachment B). In the event the Cleanup Action Plan (Attachment B) is 18 modified to terminate monitoring, Defendant shall retain all monitoring data until ten ( I 0) years after 19 monitoring is completed. Upon request of Ecology, Defendant shall make all nonarchived records 20 available to Ecology and allow access for review. All archived records shall be made available to 21 Ecology within a reasonable period of time. 22 XVIII. PROPERTY ACCESS 23 88. Defendant grants to Ecology, its employees, agents, contractors, and authorized 24 representatives an irrevocable right to enter upon the Property with reasonable notice and at any 25 reasonable time for purposes of allowing Ecology to monitor or enforce compliance with this 26 Decree. The right of entry granted in this Section is in addition to any right Ecology may have to PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 19 A ITOl<NEY GENERAL OF WASHINGTON Ecology Division PO Box40117 Olympia, WA 98$04-01 t 7 FAX (lro) 4)8-7743 enter onto the Property pursuant to specific statutory or regulatory authority. Consistent with 2 Ecology's responsibilities under state and federal law, Ecology, and any persons acting for it, shall 3 use reasonable efforts to minimize any interference and use reasonable effort not to interfere with the 4 operations of Defendant or Successors in Interest by any such entry. In the event Ecology enters the 5 Property for reasons other than emergency response, Ecology agrees that it shall provide reasonable 6 notice to Defendant of any planned entry, as well as schedules and locations of activity on the 7 Property. Ecology further agrees to accommodate reasonable requests that it modify its scheduled 8 entry or activities at the Property. Notwithstanding any provision of the Decree, Ecology retains all 9 of its access authorities and access rights, including enforcement authorities related thereto, under IO MTCA and any other applicable state statute or regulation. 11 XIX. COMPLIANCE WITH OTHER APPLICABLE LAWS 12 89. All actions carried out by Defendant or Successors in Interest pursuant to this Decree 13 shall be done in accordance with all applicable federal, state, and local requirements, including 14 applicable permitting requirements. Pursuant to RCW 70.1 OSD.090(1 ), the known and applicable 15 substantive requirements of Chapters 70.94, 70.95, 70.105, 75.20, 90.48, and 90.58 RCW, and any 16 laws requiring or authorizing local government permits or approvals for remedial action, have been 17 included in the Cleanup Action Plan and the RI and FS and are incorporated by reference here as 18 binding requirements in this Decree. 19 Defendant has a continuing obligation to determine whether additional permits or approvals 20 addressed in RCW 70.105D.090(1) would otherwise be required for the remedial action under this 21 Decree. In the event either Defendant or Ecology determines that additional permits or approvals 22 addressed in RCW 70.1050.090(1) would otherwise be required for the remedial action under this 23 Decree, it shall promptly notify the other party of this detennination. Ecology shall determine 24 whether Ecology-or Defendant shall be responsible to contact the appropriate state and/or local 25 agencies. If Ecology so requires, Defendant shall promptly consult with the appropriate state and/or 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 20 A TIORNEY GENERAL OF WASHINGTON Ecology Division PO Box 40117 Olympia, WA 93504-0117 FAX (360) 438-7743 local agencies and provide Ecology with written documentation from those agencies of the 2 substantive requirements those agencies believe are applicable to the remedial action. Ecology shall 3 make the determination on the additional substantive requirements that must be met by Defendant 4 and on how Defendant must meet those requirements. Ecology shall inform Defendant in writing of 5 these requirements. Once established by Ecology, the additional requirements shall be enforceable 6 requirements of this Decree. Defendant shall not begin or continue the remedial action potentially 7 subject to t_he additional requirements until Ecology makes its final determination. 8 Ecology shall ensure that notice and opportunity for comment are provided to the public and 9 appropriate agencies prior to establishing the substantive requirements under this Section. 10 90. Pursuant to RCW 70.1 OSD.090(2), in the event that Ecology determines that the 11 exemption from complying with the procedural requirements of the laws referenced in RCW 12 70.IOSD.090(1) would result in the loss of approval from a federal agency necessary for the state to 13 administer any federal Jaw, such exemption shall not apply, and Defendant or Successors in Interest 14 shall comply with both the procedural and substantive requirements of the Jaws referenced in RCW 15 70.IOSD.090(1). 16 XX. SAMPLING. DATA REPORTING, AND AVAILABILITY 17 91. With respect to the implementation of this Decree, Defendant shall make the results 18 of all sampling, laboratory reports, and/or test results generated by it, or on its behalf, available to 19 Ecology in hard copy and on electronic disk. Data submitted on disk shall be in a format acceptable 20 to Ecology for importation for use as a relational database into databases and/or spreadsheet software 21 commonly available. 22 92. If requested by Ecology, Defendant shall allow Ecology and/or its authorized 23 representatives to take split or duplicate samples of any samples collected by Defendant pursuant to 24 the implementation of this Decree. Defendant shall notify Ecology seven (7) days in advance of any 25 sample collection or work activity at the Property. Ecology shall, upon request, allow Defendant or 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 21 ATIORNEY GENERAL OF WASHINGTON Ecology Division POBmi:40117 Olympia,. WA 98504-011? FAX()60)4l1·110 its authorized representatives to take split or duplicate samples of any samples collected by Ecology 2 pursuant to the implementation of this Decree provided Defendant does not interfere with Ecology's 3 sampling. Ecology shall endeavor to notify Defendant prior to any sample collection activity. 4 XXI. PROGRESS REPORTS 5 93. Defendant shall submit to Ecology written monthly progress reports beginning thirty 6 (30) days prior to initiation of the Cleanup Action Plan (Attachment B) and continuing until 7 initiation of performance monitoring. After that time, progress reports shall be submitted quarterly, 8 or at other intervals as approved by Ecology. The progress reports shall describe the actions taken 9 during the reporting period to implement the requirements of this Decree. The progress report shall 10 include the following: I I 12 a. b. A list of on-site activities that have taken place during the reporting period. A detailed description of any deviations from required tasks not otherwise 13 documented in project plans or amendment requests. 14 C. A description of all deviations from the schedule during the current reporting 15 period and any planned deviations in the upcoming reporting period. 16 d. For any deviations in schedule, a plan for recovering lost time and maintaining I 7 compliance with the schedule. 18 e. A list of deliverables for the upcoming reporting period if different from the 19 schedule. 20 94. All progress reports shall be submitted by the tenth day of the month in which they 21 are due after the Effective Date of this Decree. 22 XXII. EXTENSION OF SCHEDULE 23 95. An extension of schedule shall be granted only when a request for an extension is 24 submitted in a timely fashion, generally at least thirty (30) days prior to expiration of the deadline for 25 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 22 ATTORNEY GENERAL Of WASHINGTON Ecolol}' Divi$ion POBox-40117 Olympia, WA 98504-0117 FAX (360) 436-1743 which the extension is requested, and good cause exists for granting the extension. All extensions 2 shall be requested in writing. The request shall specify the reason(s) the extension is needed. 3 96. An extension shall be granted only for such period of time as Ecology determines is 4 reasonable under the circumstances. A requested extension shall not be effective until approved by 5 Ecology or the Court. Ecology shall act upon any written request for extension in a timely fashion. 6 It shall not be necessary to formally amend this Decree pursuant to Section XI when a schedule 7 extension is granted. 8 97. The burden shall fall on Defendant to demonstrate to the satisfaction of Ecology that 9 the request for such an extension has been submitted in a timely fashion and that good cause exists IO for granting the extension. Good cause includes, but is not limited to, the following: 11 a. Circumstances beyond the reasonable control and despite the due diligence of 12 Defendant, including delays in obtaining necessary permits, delays caused by unrelated third parties 13 or Ecology, such as (but not limited to) delays by Ecology in reviewing, approving, or modifying 14 documents submitted by Defendant. 15 b. Acts of God, including fire, flood, blizzard, extreme temperatures, storm, or 16 other unavoidable casualty. 17 C. Endangerment as described in Sectbn XXIII. 18 Ecology may extend the schedule for a period not to exceed ninety (90) days, except where a 19 longer extension is needed as a result of: 20 a. Delays in the issuance of a necessary pennit which was applied for in a timely 21 manner. 22 b. Other circumstances deemed exceptional or extraordinary by Ecology. 23 However, neither increased costs of performance of the terms of the Decree nor changed 24 economic circumstances shall be considered circumstances beyond the reasonable control of 25 Defendant. 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 23 ATTORNEY GENERAL Of WASHINGTON Ecology Di"Yision PO Sox 40117 Olympia, WA 98504-0117 FAX(360) 438-114J Ecology shall give Defendant written notification in a timely fashion of any extensions 2 granted pursuant to this Decree. 3 XXIII. ENDANGERMENT 4 98. If, during implementation of this Decree, Ecology determines that there is an actual or 5 imminent danger to human health or to the environment, Ecology may order Defendant to stop 6 further implementation of this Decree for such period of time as.needed to abate the danger or may 7 petition the Court for an order as appropriate. During any stoppage of work under this Section, the 8 obligations of Defendant shall be suspended, and the time period for performance of that work, as 9 well as the time period for any other work dependent upon the work which is stopped, shall be IO extended, pursuant to Section XXII of this Decree, for such period of time as Ecology determines is 11 reasonable under the circumstances. 12 99. In the event Defendant determines that activities undertaken in furtherance oftliis 13 Decree or any other circumstances or activities are creating an imminent danger to human health or 14 to the environment, Defendant may stop implementation of this Decree for such period of time 15 necessary for Ecology to evaluate the situation and determine whether Defendant should proceed 16 with implementation of the Decree or whether the work stoppage should be continued until the 17 danger is abated. Defendant shall notify Ecology's project coordinator as soon as possible, but no 18 later than twenty-four (24) hours after stoppage of work, and thereafter provide Ecology with 19 documentation of the basis for the work stoppage. If Ecology disagrees with Defendant, Ecology 20 may order Defendant to resume implementation of this Decree. If Ecology concurs with the work 21 stoppage, Defendant's obligations shall be suspended, and the time period for performance of that 22 work, as well as the time period for any other work dependent on the work which was stopped, shall 23 be extended, pursuant to Section XXII of this Decree, for such period of time as Ecology determines 24 is reasonable under the circumstances. Any disagreements pursuant to this Section shall be resolved 25 through the dispute resolution procedures in Section XII. 26 PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 24 A TIORNEY GENERAL OF WASHINGTON Ecology Division PO 9-0x 40117 Olymp~. WA 98l04-0117 FAX (360) 43g.1743 XXlY. PERIODIC REVIEW 2 I 00. As remedial actions, including long term monitoring, continue at the site, the parties 3 agree to review the progress of remedial actions at the site, and to review the data accumulated as a 4 result of site monitoring pursuant to WAC 170-340-420. 5 XXV. CERTIFICATION OF COMPLETION AND DELISTING 6 IO 1. Upon completion of the capital portion of remedial actions specified in the Cleanup 7 Action Plan (Attaclunent B), Ecology shall issue a Partial Certificate of Completion for the capital 8 portion of the remedial actions. Upon completion of the remaining remedial actions as described in 9 Attachment B, except any necessary long term monitoring, and, upon confirmation that cleanup Jo standards have been met, Ecology will issue a Certificate of Completion. Unless Ecology becomes J l aware of circumstances at the Facility that present a previously unknown threat to human health or J 2 the environment, Ecology shall, within thirty (30) days of issuance of the Certificate of Completion, 13 propose to remove the Facility from the Hazard Ranking List, pursuant to WAC 173-340-330(4). 14 XXVI. INDEMNIFICATION AND HOLD HARMLESS 15 I 02. To the extent allowed by law, Defendant and its Successors in Interest (hereinafter 16 collectively the "Indemnitors") agree to defend, hold harmless, and indemnify the state of J 7 Washington, its employees, and agents from any and all claims or causes of action for death or 18 injuries to persons or for loss or damage to property arising from or on account of acts or omissions 19 of lndemnitors, their officers, employees,. agents, or contractors in entering into and implementing 20 this Decree. However, lndemnitors shall not indemnify the state of Washington nor save nor hold its 21 employees and agents harmless from any claims or causes of action arising out of ihe negligent acts 22· or omissions of the state of Washington, or the employees or agents of the state, in implementing the 23 activities pursuant to this Decree. In any claims against the state by any employee of the 24 lndemnitors, the indemnification obligation shall not be limited in any way by the limitation on the 25 amount or type of damages, compensation, or benefits payable by or for the lndemnitors under 26 workmen's compensation acts, disability benefit acts, or other employee benefits acts. PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 25 A lTORJ<EY GENERAL Of WASHINGTON Ecology Division P0Bo1t40ll7 Olympia,. WA 9&504-0117 FAX (360)438-7743 XXVII. CLAIMS AGAINST THE ST ATE 2 103. Defendant hereby agrees that it will not seek to recover any costs accrued in J implementing the remedial action required by this Decree from the state of Washington or any of its 4 agencies other than loans or grants from the State Toxics Control Account or any Local Toxics 5 Control Account for any costs incurred in implementing this Decree. Except as provided above, 6 however, Defendant expressly reserves its right to seek to recover any costs incurred in 7 implementing this Decree from any other potentially liable person. 8 XXVIII. PUBLIC PARTICIPATION 9 I 04. Public participation shall be accomplished by implementing the Public Participation \ o Plan attached as Attachment G. Ecology shall maintain the responsibility for public participation in 11 accordance with WAC I 73-340-600(8)(g). Defendant shall help coordinate and implement public \2 participation for the Property as required by Ecology. 13 XXIX. DURATION OF DECREE AND RETENTION OF JURISDICTION 14 105. This Decree shall remain in effect and this Court shall retain jurisdiction over both the 15 subject matter of this Decree and the parties for the duration of the performance of the terms and J 6 provision of this Decree for the purpose of enabling any of the parties to apply to the Court, as J 7 provided in the dispute resolution process set forth in Section XII, and the amendment process set 18 forth in Section XI, at any time for such further order, direction, and relief as may be necessary or J 9 appropriate to ensure that obligations of the parties have been satisfied. The Decree shall remain in 20 effect until the parties agree otherwise or until Defendant has been notified by Ecology in writing 21 that the requirements of this Decree have been satisfactorily completed. 22 XXX. PUBLIC NOTICE AND WITHDRAW AL OF CONSENT 23 I 06. This Decree has been the subject of public notice and comment as required by RCW 24 70.105D.040(4)(a). As a result of this process, Ecology has found that this Decree will lead to a 25 more expeditious cleanup of Hazardous Substances at the Property, in compliance with applicable 26 cleanup standards, and is in the public interest. PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 26 AnORNEYGENERALOFWASHINGTON Ecology Division PO Box 401 l7 Olympia, WA 9850-1-0117 FAX (360) 438-1743 107. If the Court withdraws its consent, this Decree shall be null and void at the option of 2 any party, and the accompanying Complaint shall be dismissed without costs and without prejudice. 3 In such an event, no party shall be bound by the requirements of this Decree. 4 XXXI. SEVERABILITY 5 l 08. If any section, subsection, sentence, or clause of this Agreement is found to be illegal, 6 invalid, or unenforceable, such illegality, invalidity, or unenforceability will not affect the legality, 7 validity, or enforceability of the Agreement as a whole or of any other section, subsection, sentence, 8 or clause. 9 XX.XII. EFFECTIVE DATE 10 I 09. The Effective Date of this Decree is the final date when both this Decree has been 11 entered by the Court and the closing of the property purchase is completed as defined in the Property 12 Purchase Agreement between Port Quendall Company and J. H. Baxter & Co. 13 SO ORDERED this ..1.1!: day of At; ~ , 2000. 14 15 16 17 18 19 20 21 22 23 24 25 26 ~ng County Superior Court ~ ~ p..,, [,:,... The undersigned parties enter into this Prospective Purchaser Consent Decree on the date specified below. PORT QUENDALL COMP ANY, a Washington corporation ATTORNEY GENERAL'S OFFICE L."2t'tt:-::::r'"7"2i;,;,:;-;,;::-,,t;,r,,;-:;;;-'Ct7. ~~~ted ~(I ~56~5v:; ((, JI PROSPECTIVE PURCHASER CONSENT DECREE South Baxter 27 Date: 1'2''7' t'i"; ,16. N? DEPARTMENT OF ECOLOGY A ITORNEY GENERAL Of W ASH!NGTON Eeology Division P0Box40ll7 Olympia, WA 98504-0117 FAX(360) 438-774) ATTACHMENT C RESTRICTIVE COVENANT SOUTH BAXTER !Correct Recording Format To Be Added] DRAFT April 4, 2000 ----- ------ This Declaration of Restrictive Covenant is made purs:uan1=W ~~W . 70. 1 OSD.030(1 )(f) and (g) and WAC I 73-340-440 ~--b~-=:f:brr: Quendall:C:Company~ _. ---· --~~----- Washington corporation, its successors and ~SSf@_S;' anth"oJliec StatsEWashingttm==- ---- The ~~=.tl,:_cJ:1wrconducted at the property 1) Pros2ect1Ve Purchaser Consent Decree, dated . These documents are on file at ---- ~ctive Covenant is required because the Remedial Action resulted in resid.!!aFconcentrations of certain hazardous substances which exceed the Model Toxics Control Act Method B Residential Cleanup Levels for soil and groundwater established under WAC 173-340-740. These cleanup levels are described in the Final Feasibility Study for South J. H. Baxter Property, Renton, Washington, dated _____ _ The undersigned, Port Quendall Company, is the fee owner of real property (hereafter "Property") in the County of King, State of Washington, that is subject to this Restrictive Covenant. The Property is legally described as set forth in Exhibit A, attached. Port Quendall Company makes the following declaration as to limitations restrictions, and uses to which future owners of any portion of or interest in the ProperLv:{~er ''Owner'-'[ --------- Section I. Without prior written consent::o.E.EcologJplX!iept aS::prllffded be! ----- or rell'.ITlYEllI!Y3trrn:tllrf!Blr capll3:Eqllil"ed by the=f=lF,£nup ~mm: Pia~ manner that assog_ated with future soil excavations, including health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options. In accord with the Soil Management Plan, limited excavation, utility placement or repair, minor site grading, or other pre-approved activities connected with site development and construction are permitted so long as appropriate health and safety protocols are followed and a structure or cap that provides protection from direct contact as required by the Cleanup Action Plan is pro,·ided following development. 2 Section 2. Any activity on the Property that may interfere with the inte_~il;',!ofth ----- Remedial Action and continued protection of human health and the ,envuonment:=aj and contemplates development of the Property as a mixed use:3'rcifrd..raual, re~ commercial) propc,ty. Section 3. Unless authorized by ~e ----- expcii~thway. fili::<E.@.i!anu~t1on Plan )l.e~..:.eontemplates development and ---------- ~_§on 4. :finmss auth.imz.e.d= by the Cleanup Action Plan, the Owner will not restri.,;ted to prevent swimming or direct contact with contaminated sediments at the Property. Mitigation actions required by the Cleanup Action Plan shall be maintained as set forth in the Baxter Mitigation Analysis Memorandum, which is an enforceable provision of the Cleanup Action Plan. Section 6. Following implementation of the Cleanup Action Plan, residential use on the Property is pem1itted so long as a building, or other structure (as described in the Cleanup Action plan) is present such that the residential use is located over structural 3 parking or other structures, placing the first occupied floor at least one level ahove tll.!E=:: soil and prevents direct contact with all soil that exceeds Method B Cleanu_rnv.els. Section 7. The Owner of the property must give thirty (30) da~e'E wiihteil:==-- notice to Ecology of the Owner's intent to convey a fee interest in a ~bs.taiifuif:11ort10a=irl== the Property. No conveyance of fee title in a substantial·:p'&!i&Eof tlie=Eroperty shal~ - -·---------- --~~~~ consummated by the Owner without adeg~iate ,iind3ump:le1Eprovis~ continoeil -·--· monitoring, c,J2llilmn;=and mai~~~ofihe Remedial'Kct1on;=,~nciuctffig~ mitigation 3,~tfutel::=fhe Owner must notify and obtain approval from Ecology prior to any use p.f=the Property that is inconsistent with the terms of this Restrictive Covenant. Ecology may approve any inconsistent use only after public notice and comment. Section 10. The Owner shall allow authorized representatives of Ecology the right to enter the Property at reasonable times for the purpose of evaluating the Remedial Action; to take samples, to inspect remedial actions conducted at the property, and to inspect records that are related to the Remedial Action. Ecology shall use reasonable efforts to minimize any interference and use reasonable efforts not to interfere with the operations of the Property occupancy 4 ~UI ~'l\f.<; l4 Section 11. The Owner of the Property reserves the right under W AC_ltc'.l-340 440 to record an instrument that provides that this Restrictive Covenant=sfiall=mr longe --- limit use of the Property or be of any further force or effect. H~~~ueh=-aiF==- instrument may be recorded only if Ecology, after public notice :and3'ppodunify :l, comment, concurs. PORT QUENDALL COMPANY, a _ Washington corpo~n ------- By·------- Its: DateuclruS= ----------------------··---------- 2000. 5 ----------------------- ------------------- ST A TE OF WASHINGTON COUNTY OF ___ _ certify that ) SS. ) ------- know or have satisfactory ~&neli =tl,a~ ,s the person who appeared before me~d=.SaJd pers_~ ·~~--------- acknowledged that he/she was authorized to execute the,insrtlffrYent aiicFaclfrfowledgci:FiE= . -"- ·--··-----·-·--·---·----· -~-. ----------- -------· . - as _________ of Port Quend.!1:!l_ Comp.any=to ~:e:=:ffie=free miil~luntary=acl--c=' and deed of S1!Cli·-J;Jarty:-for the US~S-and:RJ.l_fj)OSesment1on_eCJ,m'J.li1'j; mstrum~nt:c ---------------------- (Si~TI~lure of Notary) (Legibly Print or Sta inp Na me of Notary) Notary public in and for the State of Washington, residing at _________ _ My appointment expires _________ _ 6 Appendix B Partial Certificate of Completion April l 0, 2006 Mr. Clint Chase Port Qucndall Company c/o Vulcan Inc. 505 5th Ave. S., Suite 900 Seattle, WA 98104 Dear Mr. Chase: Re: Partial Certificate of the Completion for the Capital Portion of the Cleanup at the J.H. Baxter South Parcel, Renton, WA Ecology cc11ifies that the capital portion of the cleanup required under the Consent Decree and Cleanup Action Plan (CAP) dated April 4, 2000, has been completed at J.H. Baxter South Parcel, Renton, WA, in accordance with applicable environmental laws. The capital 1>irtion of the cleanup consists of the following cleanup activities: • Removal and off-site disposal of impacted sediment above the cleanup level of l 00 mg/kg total PAH from Baxter Cove; • Re-creation of wetlands adjacent to Lake Washington and buller restoration and enhancement; impact avoidance to species listed as threatened under the Endangered Species Act through hydraulic isolation of the project work and the timing of in-w.iter work; • Dense non-aqueous phase liquid (DNAPL) removal from source monitoring well BAX-14; • Excavation oflight non-aqueous liquid (LNAPL) impacted soil in the tank farm area based on an action level of 1,000 mg/kg total l' AH and oft~site disposal of soil to remove the long-term source of groundwater impacts; • Excavation and off-site disposal of listed hazardous waste from the Baxter Lagoon area; Mr. Clint Chase March 28, 2006 March 28, 2006 Page 2 • .In-situ soil stabilization of impacted soil near the Butt Tank and Baxter Lagoon area based on an action level of 1,000 mg/kg total PAR to remove the long-term source of groundwater impacts. The above remedial actions were defined as the capital portion of the remedial action-in the CAP. which includes source remediation (DNAPL removal, soil excavation and disposal or treatment, in-situ stabilization) and wetland mitigation. Ecology r~eivcd and reviewed three quarterly groundwater monitoring rcpo11s by RETEC, dated November I 0, 2005. December 22, 2005 and March 31, 2006. ·me groundwater data collected to date have met the Model Toxics Control Act (MTCA) cleanup levels. Port Quendall Company (PQC) will continue the groundwater monitoring according to the schedule specified in the CAP. Ecology also received and reviewed the "Baxter Cove Wetland Monitoring Report, Year 1, Year 2 and Year 3" by RETEC, dated October 14, 2003, November 3, 2004, imd December 22, 2005. Ecology recognizes that PQC is meeting the requirements of Corps of Engineers Wetland Permit Number 2000-2-00512, and PQC will continue the wetland monitoring program according to the schedule specified in the CAP. However, the following remedial actions have not been completed: • Capping of residual soil impacts to prevent direct contact by humans and institutional controls to ensure cap integrity into the future on both South and North Parcel; • Implementation of institutional controls to prevent future groundwater extraction and provide for the continued integrity of the cap Ecology understands that the c·apping of residual soil impacts may be dependent on the site redevelopment schedule since landscaping, parking lots, and building foundations used are all projected to comprise portions of the cap. If you have any questions, please call me at (425) 649-7187. Si_!lcerely. ~ P-/ / ,,-· . -. . __ 01 .,.,.., ... -"') ,· / <.- __.,<,-1..,,VVIV;f' . Sunny Lin Q;Jecker, P .E. Toxics Cleanup Program Appendix C Stormwater Pollution Prevention Plan Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility Renton, Washington Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite 207 Seattle, Washington 98134 RETEC Project Number: VULC1-19589-510 Prepared for: Football Northwest LLC 505 Fifth Avenue South Seattle, Washington, 98104 October 2006 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility Renton, Washington Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite 207 Seattle, Washington 98134 RETEC Project Number: VULC1-19589-510 Prepared for: Football Northwest LLC 505 Fifth Avenue South Seattle, Washington, 98104 Prepared by: Shashl M uttlge, Proj October 2006 F:IPROJECTW\Seahawb\EDR\Appendices\App c_ SWPPP'SWPPP DRAFT 10-6-06.doc Table of Contents I Introduction .................................................................................................... 1-1 1.1 Site Location ...................................................................................... 1-1 1.2 Objectives .......................................................................................... 1-2 1.3 Organization ....................................................................................... 1-2 2 Site Description .............................................................................................. 2-1 2.1 Existing Conditions ............................................................................ 2-1 2.2 Proposed Construction Activities ...................................................... 2-1 3 Construction Stormwater Best Management Practices .................................. 3-1 3.1 The 12 Best Management Practices Elements ................................... 3-1 3.1.1 Element #1 -Mark Clearing Limits ...................................... 3-1 3.1.2 Element #2 -Establish Construction Access ......................... 3-1 3 .1.3 Element #3 -Control Flow Rates .......................................... 3-1 3.1.4 Element #4-lnstall Sediment Controls ................................ 3-2 3.1.5 Element #5 -Stabilize Soils .................................................. 3-3 3.1.6 Element #6-Protect Slopes .................................................. 3-3 3. I. 7 Element #7 -Protect Drain Inlets .......................................... 3-3 3.1.8 Element #8-Stabilize Channels and Outlets ........................ 3-4 3.1.9 Element #9-Control Pollutants ............................................ 3-4 3.1.10 Element #10-Control Dewatering ....................................... 3-6 3.1.11 Element #11 -Maintain Best Management Practices ........... 3-7 3.1.12 Element #12 -Manage the Project ........................................ 3-7 3.2 Site Specific Best Management Practices .......................................... 3-9 3 .2.1 Upland Area ........................................................................... 3-9 3 .2.2 Shoreline Area ..................................................................... 3-1 O 3.3 Additional Advanced Best Management Practices .......................... 3-10 4 Pollution Prevention Team ............................................................................ 4-1 4.1 Roles and Responsibilities ................................................................. 4-1 4.2 Team Members .................................................................................. 4-1 5 Site Inspections and Monitoring .................................................................... 5-1 5.1 Site Inspection .................................................................................... 5-1 5. I. I Site Inspection Frequency ...................................................... 5-1 5.1.2 Site Inspection Documentation .............................................. 5-2 5.2 Stormwater Quality Monitoring ......................................................... 5-2 5.2.1 Sanitary Sewer Discharge ...................................................... 5-2 5.2.2 Shoreline Area Stormwater Sampling ................................... 5-2 6 Reporting and Recordkeeping ........................................................................ 6-1 6.1 Recordkeeping ................................................................................... 6-1 6.1.1 Site Log Book ........................................................................ 6-1 6.1.2 Records Retention .................................................................. 6-1 6.1.3 Access to Plans and Records .................................................. 6-1 VULCJ-19589-510 Table of Contents 6.1.4 Updating the SWPPP ............................................................. 6-1 6.2 Reporting ............................................................................................ 6-2 6.2. l Discharge Monitoring Reports ............................................... 6-2 6.2.2 Notification ofNoncompliance .............................................. 6-2 6.2.3 Permit Application and Changes ........................................... 6-2 7 References ...................................................................................................... 7-3 VULC/-19589-510 ii List of Figures Figure 1 Figure 2 Figure 3 Figure4 Figure 5 Figure 6 Site Location Map Existing Site Map · Existing Site Topographical Map Site Demolition Plan Temporary Erosion and Sedimentation Control Plan TESC Details List of Attachments Attachment A King County Metro Sewer Discharge Permit Attachment B Hydrologic Analysis Attachment C Site Construction BMPs Attachment D Site Inspection Forms Attachment E Construction Stormwater General Permit Attachment F Notice of Intent Application Form VULCJ-19589-510 iii 1 Introduction This Stormwater Pollution Prevention Plan (SWPPP) has been prepared for the proposed construction of the Seahawks Training Facility and Headquarters (facility) located on the eastern shore of Lake Washington in Renton, Washington. Environmental remediation activities have been conducted on the properties proposed for the Seahawks training facility. The Cleanup Action Plans (CAPs) pursuant to the approved Consent Decrees (2000) for the properties require an environmental cap and institutional controls to be placed over most of the properties. As part of development activities for this site, the remaining cleanup activities (capping and institutional controls) will be conducted. Development activities, beyond those required for environmental capping, include construction of an office building and an indoor practice facility structure. This SWPPP was prepared using the Ecology SWPPP Template downloaded from the Ecology Web site on August 2, 2006. This SWPPP was prepared based on the requirements set forth in the Construction Stormwater General Permit, Stormwater Management Manual for Western Washington (SWMMWW) (Ecology, 2005) and in the Stormwater Management Manual for Eastern Washington (SWMMEW) (Ecology, 2004). The goal of the SWPPP is to improve water quality by reducing pollutants in stonnwater discharges. The overall objective of the SWPPP is to prevent migration of storm water from construction areas, which is consistent with the remaining work . to be performed under the Consent Decrees. Where prevention of stormwater migration is not possible, erosion will be controlled by measures specified herein. 1.1 Site Location The site for the proposed Seahawks facility consists of two properties known as North Baxter Property and South Baxter Property. The North Baxter Property, known as the North J. H. Baxter Property/Renton ("North Baxter Property''), is located at 5015 Lake Washington Boulevard North, on the eastern shore of Lake Washington in Renton, King County, Washington (Figure 1). The North Baxter Property occupies approximately 12 acres, three miles south of the junction of Interstate Highways 405 and 90. The North Baxter Property is relatively flat and is situated within the northern portion of a roughly 70-acre alluvial plain bordering the Lake Washington shoreline. The Misty Cove Condominiums are located directly to the north of the site. The South Baxter Property is located in the southern part of the site. Further to the south is the Quendall Terminals property. Interstate 405 is approximately 500 feet to the east. The North Baxter Property is bordered to the south by the South Baxter Property. VULCI-19589-510 1-1 Stonnwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington 1.2 Objectives The objectives of the SWPPP are to: 1) Implement Best Management Practices (BMPs) to prevent erosion and sedimentation, and to identify, reduce, eliminate or prevent stormwater contamination and water pollution from construction activity. 2) Prevent violations of surface water quality, ground water quality, . or sediment management standards. 3) Prevent, during the construction phase, adverse water quality impacts including impacts on beneficial uses of the receiving water by controlling peak flow rates and volwnes of stormwater runoff at the Permittee's outfalls and downstream of the outfalls. 1.3 Organization The report is divided into seven main sections with several attachments that include stormwater related reference materials. The topics presented in the each of the main sections are: • Section 1 -Introduction. This section provides a summary description of the project, and the organization of the SWPPP document. • Section 2 -Site Description. This section provides a detailed description of the existing site conditions, proposed construction activities, and calculated stormwater flow rates for existing conditions and during construction conditions. • Section 3 -Construction BMPs. This section provides a detailed description of the BMPs to be implemented based on the 12 required elements of the SWPPP (SWMMEW 2004). • Section 4 -Pollution Prevention Team. This section identifies the appropriate contact names (emergency and non-emergency), monitoring personnel, and the on-site temporary erosion and sedimentation control inspector • Section 5 -Inspection and Monitoring. This section provides a description of the inspection and monitoring requirements such as the parameters of concern to be monitored, sample locations, sample frequencies, and sampling methods for all stormwater discharge locations from the site VULCJ-19589-510 1-2 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington • Section 6 -Recordkeeping. This section describes the requirements for documentation of the BMP implementation, site inspections, monitoring results, and changes to the implementation of certain BMPs due to site factors experienced during construction. Supporting documentation and standard forms are provided in the following attachments: • Attachment A -King County Metro Sewer Permit • Attachment B -Hydro logic Analysis • Attachment C -Site Construction BMPs • Attachment D -Site Inspection Forms • Attachment E ~ Construction Stormwater General Permit • Attachment F -Notice of Intent Application Form. Construction activities will include demolition, excavation, grading, a permanent indoor practice field structure, office building, four outdoor practice fields, parking and landscaping. This SWPPP presents the proposed construction activities and all temporary erosion and sediment control (TESC) measures, pollution prevention measures, inspection/monitoring activities, and recordkeeping that will be implemented during the proposed construction project. VULCJ-19589-5/0 1-3 2 Site Description 2.1 Existing Conditions The proposed site of the Seahawks training facility and headquarters is at 5015 Lake Washington Boulevard North on the eastern shore of Lake Washington in the northeastern portion of the City of Renton in King County, Washington. The site occupies approximately 20 acres, three miles south of the junction of Interstate Highways 405 and 90. The site is relatively flat and is situated within the northern portion of a roughly 70-acre alluvial plain bordering the Lake Washington shoreline. A site vicinity map based on USGS topographic map is provided in Figure 2. The existing site is currently flat topographically with weedy brush cover. Based on the geotechnical report conducted for the proposed facility construction (Shannon & Wilson, 2006), the north side of the Baxter site is underlain by a surface crust of man-made fills followed by very soft to stiff, fine-grained, depression fill sediments (silt, clay and organic peat) and loose to medium dense, coarse-grained, alluvial sediments (sands and gravels) to depth ranging from 17 feet to 58 feet. Additionally, a stormwater technical report for the site (Magnusson Klemencic, 2006) describes the surficial soils as likely fill materials due to past operations at the site. Native soils at the site are mostly under the fill materials. For drainage analysis purposes, the soils were treated as Hydrologic Soil Group C, moderate runoff soils. As indicated on the site topographical map (Figure 2), runoff from the site generally drains from east to west to an existing quarry lined pond located on the northeast comer of the site, toward Lake Washington. Based on infonnation from the Class 2 stream mapping for the site, the Gypsy Creek Sub-basin drainage is conveyed on-site via a 24-inch culvert underneath the Burlington Northern railroad tracks near the northeast comer of the site. Upon entering the site, the drainage is discharged to a quarry-lined pond. Beyond the pond, the drainage appears to be piped underground until being discharged along the shoreline of Lake Washington. There are no critical areas on the site such as high erosion risk areas or steep slopes (potential landslide area). There is a wetland along the shoreline of Lake Washington of the site which was established in its current configuration as a mitigation requirement of the South Baxter Consent Decree. 2.2 Proposed Construction Activities The proposed development includes construction of four outdoor practice fields, an indoor practice field building, parking lots, and landscaping. Construction activities will include site preparation, grading. paving, TESC installation, demolition, construction of three outdoor (natural grass) practice fields, an outdoor artificial turf practice field, an indoor practice building field VULC/-/9589-510 2-1 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Ren/on, Washington structure, office building, parking lots, and landscape features. New sanitary, electric, gas, and storm drain utilities will also be constructed. In addition, the existing stormwater pipe at the quarry lined pond will be rerouted by installing a large diameter stonnwater pipeline connecting the existing outfall at the shoreline of Lake Washington. Details of the proposed construction activities are provided in the Engineering Design Report (RETEC, 2006). Stormwater runoff generated during the proposed construction activities from the environmental capping footprint will be discharged to an existing sanitary sewer under the discharge criteria of the King County Sewer discharge permit provided in Attachment A. Any stormwater discharged to Lake Washington during construction activities will be incidental and will occur from a narrow 25-foot buffer along the shoreline that is not included in the environmental capping footprint. Activity within this buffer area will include placement of stonnwater discharge structures and riparian plantings. Stonnwater runoff volumes generated during 2-year and JO-year, 24-hour storm events were calculated and provided in Attachment B of this SWPPP. This report documents the stormwater and drainage discharge design approach for the facility during construction activities. The following summarizes details regarding site areas: Total site area: Percent impervious area before construction: Percent impervious area during construction: Disturbed area during construction: Disturbed area that is characterized as impervious (i.e., access roads, staging, parking): 2-year stormwater runoff peak flow prior to construction (existing): 10-year stormwater runoff peak flow prior to construction (existing): 2-year stormwater runoff peak flow during construction: 10-year stormwater runoff peak flow during construction: Acres 6.7% <0.1% 19.4 ·acres 1.3 acres 0.4 cfs 1.23 cfs 0.35 cfs 0.91 cfs All stormwater flow calculations are provided in Attachment B. VULCJ-19589-510 2-2 3 Construction Stormwater Best Management Practices 3.1 The 12 Best Management Practices Elements 3.1.1 Element #1 -Mark Clearing Limits The limits of construction will be clearly marked before land-disturbing activities begin. Trees that are to be preserved, as well as all sensitive areas and their buffers, will be clearly delineated, both in the field and on the plans. In general, natural vegetation and native topsoil will be retained in an undisturbed state to the maximum extent possible. The BMPs relevant to marking the clearing limits that will be applied for this project include: • Buffer zones (BMP C 102) • High Visibility Plastic or Metal Fence (BMP Cl 03). 3.1.2 Element #2 -Establish Construction Access Construction access or activities occurring on unpaved areas will be minimized, yet where necessary, access points will be stabilized to minimize the tracking of sediment onto public roads, and wheel washing, street sweeping, and street cleaning will be employed to prevent sediment from entering state waters. All wash wastewater will be controlled on site. The specific BMPs related to establishing construction access that will be used as necessary on this project include: • Stabilized Construction Entrance (BMP Cl 05) • Construction Road/Parking Area Stabilization (BMP Cl 07). 3.1.3 Element #3 -Control Flow Rates In order to protect the properties and waterways downstream of the project site, stormwater discharges from the site will be controlled. The specific BMPs for flow control that will be used as necessary on this project include: • Sediment Trap (BMP C240) • Temporary Sediment Pond (BMP C241). The project site is located west of the Cascade Mountain Crest. As such, the project must comply with Minimum Requirement 7 (Ecology, 2005). In general, discharge rates of stormwater from the site will be controlled where increases in impervious area or soil compaction during construction could lead to downstream erosion, or where necessary to meet local agency VULCI-19589-5/0 3-1 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington stormwater discharge requirements (e.g. discharge to combined sewer systems). 3.1.4 Element #4-Install Sediment Controls All stonnwater runoff from disturbed areas will pass through an appropriate sediment removal BMP before leaving the construction site or prior fo being discharged to an infiltration facility. The specific BMPs that may be used for controlling sediment on this project include: • Straw Bale Barrier (BMP C230) • Silt Fence (BMP C233) • Sediment Trap (BMP C240) • Storm Drain Inlet Protection (BMP C220) • Portable Water Storage Tanks (e.g., Baker Tanlc) for Sedimentation. In addition, sediment will be removed from paved areas in and adjacent to construction work areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on vehicle tires away from the site and to minimize washoff of sediments from adjacent streets in runoff. Whenever possible, sediment laden water will be discharged into onsite, relatively level, vegetated areas-(BMP C240 paragraph 5, page 4-102). In some cases, sediment discharge in concentrated rnnoff can be controlled using permanent stormwater BMPs (e.g., infiltration swales, ponds, trenches). Sediment loads can limit the effectiveness of some permanent stormwater BMPs; such as those used for infiltration or biofiltration; however, those BMPs designed to remove solids by settling (wet ponds· or detention ponds) can be used during the constrnction phase. When permanent stormwater BMPs will be used to control sediment discharge during constrnction, the strncture will be protected from excessive sedimentation with adequate erosion and sediment control BMPs. Any accumulated sediment will be removed after construction is complete and the permanent stormwater BMP will be restabilized with vegetation per applicable design requirements once the remainder of the site has been stabilized. The following BMPs will be implemented as end-of-pipe sediment controls as required to meet permitted turbidity limits in the site discharge(s). Prior to the implementation of these technologies, sediment sources and erosion control and soil stabilization BMP efforts will be maximized to reduce the need for end-of-pipe sedimentation controls, including the following: • Temporary Sediment Pond (BMP C24 l) VULCJ-19589-510 3-2 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington • Construction Stormwater Filtration (BMP C25 l) • Construction Stormwater Chemical Treatment (BMP C 250) (implemented only with prior written approval from Ecology). 3.1.5 Element #5 -Stabilize Soils Exposed and unworked soils will be stabilized with the application of effective BMPs to prevent erosion throughout the life of the project. The specific BMPs for soil stabilization that may be used as necessary oh this project include: • Temporary and Permanent Seeding (BMP CI20) • Sodding (BMP C124) • Topsoiling (BMP CI25) • Dust Control (BMP C140) • Early application of gravel base on areas to be paved. The project site is located west of the Cascade Mountain Crest. As such, no soils will remain exposed and unworked for more than 7 days during the dry season (May I to September 30) and 2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils will be stabilized at the end of the shift before a holiday or weekend if needed based on weather forecasts. In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be temporarily covered with plastic sheeting. All stockpiled soils will be stabilized to avoid erosion, protected with sediment trapping measures, and where possible, be located away from storm drain inlets, waterways, and drainage channels. 3.1.6 Element #6 -Protect Slopes All cut and fill slopes will be designed, constructed, and protected in a manner than minimizes erosion. The following specific BMPs may be used as necessary to protect slopes for this project: • Temporary and Permanent Seeding (BMP CI20) • Interceptor Dike and Swale (BMP C200) • Pipe Slope Drains (BMP C204). 3.1. 7 Element #7 -Protect Drain Inlets All storm drain inlets and culverts made operable during construction will be protected to prevent unfiltered or untreated water from entering the drainage conveyance system. However, the first priority is to keep all access roads clean of sediment and keep street runoff separate from entering storm drains until treatment can be provided. Storm Drain Inlet Protection (BMP C220) VULC/-19589-5/0 3-3 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington will be implemented for all storm drain inlets that could potentially be impacted by sediment-laden runoff on and near the project site. The following inlet protection measures that may be used on this project include: • Drop Inlet Protection ~ Excavated Drop Inlet Protection • Block and Gravel Drop Inlet Protection • Gravel and Wire Drop Inlet Protection • Catch Basin Filters • Alternative BMP not included in the SWMMWW (2005) or SWMMEW (2004) • Culvert Inlet Sediment Trap • Alternative BMP not included m the SWMMWW (2005) or SWMMEW (2004). 3.1.8 Element #8 -Stabilize Channels and Outlets 3.1.9 Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural drainage point, efforts will be taken to prevent downstream erosion. The specific BMPs for channel and outlet stabilization. that will be used on this project include: • Check Dams (BMP C207). Since the project site is located west of the Cascade Mountain Crest, all temporary on-site conveyance channels will be designed, constructed, and stabilized to prevent erosion from the expected peak 10 minute velocity of flow from a Type IA, 10-year, 24-hour recurrence interval storm for the developed condition. Alternatively, the 10-year, I-hour peak flow rate indicated by an approved continuous runoff simulation model, increased by a factor of 1.6, will be used. Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent stream banks, slopes, and downstream reaches will be provided at the outlets of all conveyance systems. Element #9 -Control Pollutants All pollutants, including waste materials and demolition debris, that occur on site will be handled and disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well organized, and free of debris. If required, BMPs to be implemented to control specific sources of pollutants are discussed below. VULCl-19589-510 3-4 Stonnwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington Vehicles, construction equipment, and/or petroleum product storage/dispensing: • All vehicles, equipment, and petroleum product storage/dispensing areas will be inspected regularly to detect any leaks or spills, and to identify maintenance needs to prevent leaks or spills. • On-site fueling tanks and petroleum product storage containers will include secondary containment. • Spill prevention measures, such as drip pans, will be used when conducting maintenance and repair of vehicles or equipment. • In order to perform emergency repairs on site, temporary plastic liner will be placed beneath and, if raining, over the vehicle. • Contaminated surfaces will be cleaned immediately following any discharge or spill incident. Chemical storage: • Any chemicals stored in the construction areas will conform to the appropriate source control BMPs listed in Volume IV of the Ecology stormwater manual. All chemicals will have cover, containment, and protection provided on site, per BMP Cl53 for Material Delivery, Storage and Containment in the SWMMWW. • Application of agricultural chemicals, including fertilizers and pesticides, will be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' recommendations for application procedures and rates will be followed. Excavation and tunneling spoils dewatering waste: • Dewatering BMPs and BMPs specific to the excavation and tunneling ( including handling of contaminated soils) are discussed under Element 10. Demolition: • Dust released from demolished sidewalks, buildings, or structures will be controlled using Dust Control measures (BMP Cl40). · • Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or debris will be protected using Storm Drain Inlet Protection (BMP C220 as described above for Element 7). • Process water and slurry resulting from sawcutting and surfacing operations will be prevented from entering the waters of the State VULCI-19589,510 3-5 Stonmvater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington by implementing Sawcutting and Surfacing Pollution Prevention measures (BMP C152) . . Concrete and grout: • Process water and slurry resulting from concrete work will be prevented from entering the waters of the State by implementing Concrete Handling measures (BMP C151). · Sanitary wastewater: • Portable sanitation facilities will be firmly secured; regularly maintained, and emptied when necessary .. • Wheel wash or tire bath wastewater will be discharged to a separate on-site treatment system or to the sanitary sewer as part of Wheel Wash implementation (BMP C106). Solid Waste: • Solid waste will be stored in secure, clearly marked containers. The facility does not require a Spill Prevention, Control, and Countermeasure (SPCC) Plan under the federal regulations of the Clean Water Act (CWA). 3.1.10 Element #1 O -Control Dewatering All dewatering water from open cut excavation, tunneling, foundation work, trench, or underground vaults will be discharged into a controlled conveyance system prior to discharge to a sediment trap or sediment pond. Channels will be stabilized, per Element #8. Clean, non-turbid dewatering water will not be routed through stormwater sediment ponds; instead, it will be discharged to systems tributary to the receiving waters of the State in a manner that does not cause erosion, flooding, or a violation of State water quality standards in the receiving water. Highly turbid dewatering water from soils known or suspected to be contaminated, or from use of construction equipment, will require additional monitoring and treatment as required for the specific pollutants based on the receiving waters into which the discharge is occurring. Such monitoring is the responsibility of the contractor. However, the dewatering of soils known to be free of contamination will trigger BMPs to trap sediment and reduce turbidity. At a minimum, geotextile fabric socks/bags/cells will be used to filter this material. Other BMPs to be used for sediment trapping and turbidity reduction may include the following: • Temporary Sediment Pond (BMP C241) • Construction Stormwater Chemical Treatment (BMP.C250). VULC/-19589-5/0 3-6 Stonnwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington 3.1.11 Element #11 -Maintain Best Management Practices All temporary erosion and sediment control BMPs will be maintained and repaired as needed to assure continued performance of their intended function. Maintenance and repair will be conducted in accordance the specifications of each particular BMP. Visual monitoring of the BMPs will be conducted at least once every calendar week and within 24 hours of any rainfall event that causes a discharge from the site. If the site becomes inactive, and is temporarily stabilized, the inspection frequency will be reduced to once every month. All temporary erosion and sediment control BMPs will be removed within 30 days after the final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment will be removed or stabilized on site. Disturbed soil resulting from removal of BMPs or vegetation will be permanently stabilized. 3.1.12 Element #12-Manage the Project Erosion and sediment control BMPs for this project have been designed based on the following principles: • Design the project to fit the existing topography, soils, and drainage patterns • Emphasize erosion control rather than sediment control • Minimize the extent and duration of the area exposed • Keep runoff velocities low • Retain sediment on site • Thoroughly monitor site and maintain all ESC measures. In addition, the project will be managed according to the following key project components: Seasonal Work Limitations • From October 1 through April 30, clearing, grading, and other soil disturbing activities will only be permitted if shown to the satisfaction of the local permitting authority that silt-laden runoff will be prevented from leaving the site through a combination of the following: VULCJ-19589-510 3-7 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington ~ Site conditions including existing vegetative coverage, slope, soil type, and proximity to receiving waters ~ Limitations on activities and the extent of disturbed areas ~ Proposed erosion and sediment control measures. • Based on the information provided and/or loca1 weather conditions, the local pennitting authority may expand or restrict the seasonal limitation on site disturbance. • The following activities are exempt from the seasonal clearing and grading limitations: ~ Routine maintenance and necessary repair of erosion and sediment control BMPs ~ Routine maintenance of public facilities or existing utility stnictures that do not expose the soil or result in the removal. of· the vegetative cover to soil ~ Activities where there is 100 percent infiltration of surface water runoff within the site in approved and installed erosion and sediment control facilities. Coordination with Utilities and Other Jurisdictions • Care has been taken to coordinate with utilities, other construction projects, and the local jurisdiction in preparing this SWPPP and scheduling the construction work. Inspection and Monitoring • All BMPs will be inspected, maintained, and repaired as needed to assure continued performance of their intended function. Site inspections will be conducted by a person who is knowledgeable in the principles and practices of erosion and sediment control. This person has the necessary skills to: ~ Assess the site conditions and construction activities that could impact the quality of stormwater, and ~ Assess . the effectiveness of erosion and sediment control measures used to control the quality of stormwater discharges. • A Certified Erosion and Sediment Control Lead will be on site or on-call at all times. VULCJ-19589-510 3-8 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington • Whenever inspection and/or monitoring reveals that the BMPs identified in this SWPPP are inadequate, due to the actual discharge of or potential to discharge a significant amount of any pollutant, appropriate BMPs, or design changes will be implemented as soon as possible. Maintaining an Updated Construction SWPPP • This SWPPP will be retained on site or within reasonable access to the site. • The SWPPP will be modified whenever there is a change in the design, construction, operation, or maintenance at the construction site that has, or could have, a significant effect on the discharge of pollutants to waters of the state. • The SWPPP will be modified if, during inspections or investigations conducted by the owner/operator, or the applicable local or state regulatory authority, it is determined that the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site. The SWPPP will be modified as necessary to include additional or modified BMPs designed to correct problems identified. Revisions to the SWPPP will be completed within seven (7) days following the inspection. 3.2 Site Specific Best Management Practices 3.2.1 Upland Area Site-specific BMPs are shown on the TESC Plan Sheets and Details in Figures 5 and 6. These site specific plan sheets will be updated annually. A list of the construction BMPs to be implemented at the site is provided in Attachment C for reference. Figure 5 shows the proposed temporary erosion and sedimentation controls during construction. Interceptor swales will be installed at the approximate locations indicated on Figure 5. Typical TESC construction details are shown on Figure 6. The swales will be positioned at the downgradient side of the construction areas to intercept runoff that occurs during rain. periods. Drainage flow directions of the swales are depicted on the drawing. Sediment catchment areas will be installed at the end of the swales to collect sediments prior to discharge the runoff into Baker tanks or pump directly to the on-site temporary sediment pond. As shown, the proposed temporary sediment pond will be located in the southwestern comer of the site, adjacent to the sanitary sewer. The sediment pond will be constructed below existing grade and will be lined. The pond will be designed to provide a maximum storage for runoff occur at the site based on IO-year, 24-hour storm event, i.e., 2.9 inches. VULCJ-19589-510 3-9 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington The pond water level will be maintained at a minimum by pumping the water into the sanitary sewer as indicated on the drawing. A copy of the authorization for the discharge to the sanitary sewer is provided in Attachment A. The hydrologic calculations of peak runoff under pre-construction and during construction conditions are provided in Attachment B. Based on the hydro logic calculations, a pond with bottom widths of 150 feet by 150· feet by 2 feet deep, and a side slope of2:l (H:V), will provide approximately 47,400 cubic feet of storage, greater than 45,600 cubic feet of 10-year, 24-hour runoff volume. 3.2.2 Shoreline Area A 25-foot buffer along the lake shoreline will be established during construction, as indicated on Figure 5. The site grading will provide a hydraulic divide at the 25-foot buffer line, i.e., runoff from the area east of the 25-foot line will be collected by the interceptor swales in the upland areas. Within the 25-foot buffer zone, a swale will be constructed to collect runoff that occurs in the 25-foot area. The swale bottom will be at least 6 inches above the Lake Washington ordinary high water mark, and the swale will extend along the entire shoreline of the site. Runoff collected in the swale will be discharge via seepage into the lake, or overflows into the lake. 3.3 Additional Advanced Best Management Practices The BMP implementation schedule will be driven by the construction schedule. The BMP implementation schedule will be keyed to proposed phases of the construction project, and reflects differences in BMP installations and inspections that relate to wet season construction. The construction schedule will be provided at a later date. The project site is located west of the Cascade Mountain Crest. As such, the dry season is considered to be from May 1 to September 30 and the wet season is considered to be from October 1 to April 30. VULCJ-19589-510 3-10 4 Pollution Prevention Team 4.1 Roles and Responsibilities The pollution prevention team consists of personnel responsible for implementation of the SWPPP, including the following: • Certified Erosion and Sediment Control Lead (CESCL) -Primary contractor contact, responsible for site inspections (BMPs, visual monitoring, sampling, etc.); to be called upon in case of failure of any ESC measures • Civil Engineer -Site representative for the owner that is the project's supervising engineer responsible for inspections and issuing instructions and drawings to the contractor's site supervisor or representative. • Emergency Ecology Contact -Individual to be contacted at Ecology in case of emergency • Emergency Owner Contact -Individual that is the site owner or representative of the site owner to be contacted in the case of an emergency • Non-Emergency Ecology Contact -Individual that is the site owner or representative of the site owner than can be contacted ifrequired • Monitoring Personnel -Personnel responsible for conducting sanitary sewer discharge monitoring. 4.2 Team Members Names and contact information for those identified as members of the pollution prevention team are provided in the following table. Title Name(s) Phone Number Certified Erosion and Sediment John Weller, Bayley Construction (206) 621-8884 Control Lead (CESCL) Civil Engineer Steven Haluschak, MKA (206) 624-9349 Emergency Ecology Contact Regional Office 24-hour Main (425) 649-7000 Line Emergency Owner Contact Ray Colliver (206) 342-2000 Non-Emergency Ecology Contact Sunny Becker (425) 649-7187 Monitoring Personnel Shashi Muttige, RETEC (206) 624-9349 VULCI-19589-510 4-1 5 Site Inspections and Monitoring Site inspection and monitoring include visual inspection of BMPs, and monitoring of sanitary sewer discharge and documentation of the inspection and monitoring findings in a site log book. A site log book will be maintained for all on-site construction activities and will include: • A record of the implementation of the SWPPP and other pennit requirements • Site inspections • Stonnwater quality monitoring. For convenience, the inspection fonns are provided in Attachment D of this SWPPP. The inspection forms will be included in the site log book and maintained on site or within reasonable access to the site and be made available upon request by Ecology or the local jurisdiction. 5.1 Site Inspection 5.1.1 All BMPs will be inspected, maintained, and repaired as needed to assure continued perfonnance of their intended function. The inspector will be a Certified Erosion and Sediment Control Lead (CESCL) per BMP C160. The name and contact infonnation for the CESCL is provided in Section 4.2 of this SWPPP. Site inspection will occur in all areas disturbed by construction activities and at the sanitary sewer discharge point. It is anticipated that the sanitary sewer discharge will be monitored for settleable solids, metals (copper, arsenic), base neutral acid organics (cresol, pentachlorophenol, naphthalene), and daily (24-hour) flow. The site inspector will evaluate and document the effectiveness of the installed BMPs and determine if it is necessary to repair or replace any of the BMPs to improve the quality of stormwater discharges. · All maintenance and repairs will be documented in the site log book or forms provided in this document.· All new BMPs or design changes will be documented in the SWPPP as soon as possible. Site Inspection Frequency Site inspections will be conducted at least once a week and within 24 hours following any rainfall event which causes a discharge of stormwater from the site. For sites with temporary stabilization measures, the site inspection frequency can be reduced to once every month. VULCJ-19589-510 5-1 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington 5.1.2 Site Inspection Documentation The site inspector will record each site inspection using the site log inspection forms provided in Attachment D. The site inspection log forms may be separated from this SWPPP document, but will be maintained on site or within reasonable access to the site and be made available upon request by Ecology or the local jurisdiction. 5.2 Stormwater Quality Monitoring 5.2.1 Sanitary Sewer Discharge Based on the previous project performed on the South Baxter Property, the stormwater discharge to the King County sanitary sewer system was monitored in accordance with the following discharge limitations. The discharge parameters and limitations will be updated after the permit is issued by King County. Parameter Limit Settleable Solids 7ml/l Arsenic 1.0 mg/L Copper 3.0mg/L m-cresol 200mg/L o-creosol 200mg/L p-cresol 200 mg/L Pentachlorophenol 4.57 mg/L . Naphthalene 2.54mg/L Maximum Discharge Rate 250gpm Daily (24-hour) Flow TBD 5.2.2 Shoreline Area Stormwater Sampling · Monitoring requirements for the shoreline area will include either turbidity or water transparency sampling to monitor site discharges for water quality compliance with the 2005 Construction Storrnwater General Permit (Attachment E). Sampling will be conducted at the swale at least once per calendar week when there is a discharge. The sampling locations will be determined after the swale is constructed within the 25-foot shoreline buffer zone. Turbidity Sampling Turbidity or transparency monitoring will follow the analytical methodologies described in Section S4 of the 2005 Construction Storrnwater General Permit (Attachment E). The key benchmark values that require action are 25 NTU for VULC/-19589-5/0 5-2 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington turbidity ( equivalent to 32 cm transparency) and 250 NfU for turbidity ( equivalent to 6 cm transparency). If the 25 NTU benchmark for turbidity ( equivalent to 32 cm transparency) is exceeded, the following steps will be conducted: I) Ensure all BMPs specified in this SWPPP are installed and functioning as intended. 2) Assess whether additional BMPs should be implemented, and document revisions to the SWPPP as necessary. 3) Sample discharge location daily until the analysis results are less than 25 NfU (turbidity) or greater than 32 cm (transparency). If the turbidity is greater than 25 NTU (or transparency is less than 32 cm) but less than 250 NfU (transparency greater than 6 cm) for more than 3 days, additional treatment BMPs will be implemented within 24 hours of the third consecutive sample that exceeded the benchmark value. Additional treatment BMPs to be considered will include, but are not limited to, off-site treatment, infiltration, filtration, and chemical treatment. If the 250 NTU benchmark for turbidity (or less than 6 cm transparency) is exceeded at any time, the following steps will be conducted: 4) Notify Ecology by phone within 24 hours of analysis (see Section 4.0 of this SWPPP for contact information). 5) Continue daily sampling until the turbidity is less than 25 NfU ( or transparency is greater than 32 cm). 6) Initiate additional treatment BMPs such as off-site treatment, infiltration, filtration, and chemical treatment within 24 hours of the first 250 NfU exceedance. 7) Implement additional treatment BMPs as soon as possible, but within 7 days of the first 250 NfU exceedance. 8) Describe inspection results and remedial actions taken in the site log book and in monthly discharge monitoring reports as described in Section 7.0 of this SWPPP. pH Sampling The 25-foot shoreline buffer along Lake Washington will be hydraulically separated from the upland construction activities. Runoff associated with the construction activities in the upland areas will be collected by interceptor swales and transferred to an on-site sediment pond and eventually discharges VULCI-19589-5/0 5-3 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington to the sanitary sewer. Therefore, stormwater runoff in the 25-foot shoreline buffer will be monitored for pH weekly. Stormwater samples will be collected from the swale within the 25-foot shoreline buffer and measured for pH using a calibrated pH meter, pH test kit, or wide range pH indicator paper. If the measured pH is 8.5 or greater, the following steps will be conducted: 1) Prevent the high pH water from entering the buffer area. 2) Adjust or neutralize the high pH water if necessary using appropriate technology such as CO2 sparging (liquid or dry ice). 3) Contact Ecology if chemical treatment other than CO2 sparging is planned. VULC/-19589-5/0 5-4 6 Reporting and Recordkeeping 6.1 Recordkeeping 6.1.1 Site Log Book 6.1.2 A site log book will be maintained for all on-site construction activities and will include: • A record of the implementation of the SWPPP and other permit requirements • Site inspections • Sanitary sewer discharge monitoring. The inspection form and sanitary discharge forms will be included in the site log book. Records Retention Records of all monitoring information (site log book, inspection reports/checklists, etc.), this Stormwater Pollution Prevention Plan, and any other documentation of compliance with permit requirements will be retained during the life of the construction project and for a minimum of three years followi_ng the termination of permit coverage in accordance with Special Condition S5.C of Ecology's Construction Stormwater General Permit (General Permit). A copy of Ecology's General Permit and Notice of futent (NOi) Application Form are included in Attachments E and F, respectively. 6.1.3 Access to Plans and Records The SWPPP, General Permit, Notice of Authorization letter, and Site Log Book will be retained on site or within reasonable access to the site and will be made immediately available upon request to Ecology or the local jurisdiction. A copy of this SWPPP will be provided to Ecology within 14 days of receipt of a written request for the SWPPP from Ecology. Any other information requested by Ecology will be submitted within a reasonable time. A copy of the SWPPP or access to the SWPPP will be provided to the public when requested in writing in accordance with General Permit Special Condition SS.G. 6.1.4 Updating the SWPPP fu accordance with Special Conditions S3, S4.B, and S9.B.3 of the General Permit, this SWPPP will be modified if the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site or there has been a change in design, construction, operation, or VULCJ-19589-510 6-1 Stormwater Pollution Prevention Plan Seahawks Headquarters and Training Facility, Renton, Washington maintenance at the site that has a significant effect on the discharge, or potential for discharge, of pollutants to the waters of the State. The SWPPP will be modified within seven days of determination based on inspection(s) that additional or modified BMPs are necessary to correct problems identified, and an updated timeline for BMP implementation will be prepared. 6.2 Reporting 6.2.1 Discharge Monitoring Reports 6.2.2 6.2.3 Discharge Monitoring Report (DMR) forms will not be submitted to Ecology because water quality sampling will not be conducted at the site. Notification of Noncompliance If any of the terms and conditions of the permit are not met, and it causes a threat to human health or the environment, the following steps will be taken in accordance with General Permit Special Condition S5.F: 1) Ecology will be immediately notified of the failure to comply. 2) Immediate action will be taken to control the noncompliance issue and to correct the problem. If applicable, sampling and analysis of any noncompliance will be repeated immediately and the results submitted to Ecology within five (5) days of becoming aware of the violation. 3) A detailed written report describing the noncompliance will be submitted to Ecology within five (5) days, unless requested earlier by Ecology. Permit Application and Changes In accordance with General Permit Special Condition S2.A, a complete application form will be submitted to Ecology and the appropriate local jurisdiction (if applicable) to be covered by the General Permit. VULCl-19589-5/0 6-2 7 References Magnusson Klemencic, 2006. Stormwater Technical Information -Seahawks Headquarters and Training Facility, Renton, Washington. August 24. Shannon & Wilson, 2006. Geotechnical Report -Seahawks Headquarters and Training Facility, Renton, Washington. September 13. 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"'!l\,, , i,I .. ·· ... • • .. >... ·--,. . ··=L.... -. = 1 ,_.,, .. ,•" . ~~~LA>¥-.~· .J I ~ ·~ . ..,. • I • ---~--·---.-:-----.-~ -~,-.,.-=-• ...... ...---·~-- o,rcH Ol'CH C: It-+-·-·-·-·-\--,,,, ~ ..,___, .... ~. . ·-+-·-·-·-·-' r ,· 1 =·=+·~-·-'-f'9"'·-.~--·-~ , ----·-------r ro 2K corn,,...,.,. ~O<j;,'JQ 111\1) • • (:.: ,-;... ~ J 0 >· SOURCE: SITE DRAWINGS FROM MKA & CRAWFORD m >O" amOH-,,s .-,--___........ . .....--- .• ..........-· ..........-· .---=· ---·---· ---.---·---·---•---•-----, IINGTON BL VD SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 EXISTING SITE MAP ti ~ 50 0 1CO / :", ..... RETE( ~--1 1 oo· 7 lo.re 1014106 !os"' EM /SEA I I I FIGURE 2 l \ ,, \ "--/ \ \. ------ ------------- LEGEND~ [=_] ASPHALT / CONCRETE BUILDING ~ ~~ ~' ii /Ii I ~\ ~"' \' I.A.kc 'lv1ts11,NGroN CHAIN L'~K FENCE PROPERTY LINE PROPER1Y BOUNDARY DRAINAGE FLOW DIRECTION _ .. ,., ~ " t ,, "' " ~·. " ,~, ,,, ;( ,_-., ,, '-."':, "' {! ,f 't ·< ~ ,, 8 ,, ,, :'S '; ::;:' ~ :.,; Q 3' "' {\ "'i " ~ ~~', ~ 'Lb ~ --=-= - "' 1 ~-RETEC -':' -- NOTE; \ \ \ /soUTH BAXTER PROPERTY ~ NORTH BAXTER PROPERTY ~' )\ ~ \ \ CJ ~~~ ~\RRYPOND '-' ------' .---~ ~ .~~- ~=---=- BASE MAP BASED ON BuSH, ROED & HITCHINGS SURVEY 09/05/2006. VERTICAL DATUM, --- so 0 r-.•.-. 1"=100' 100 / r- ·---=::, _ _J ==-- SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 DATE: 10/':L_06 ORI™. E.M./_SEA I _/ I I ,l,,J z; A 1 ! ' )' \ ! 1. I / ...... ~ ( EXISTING SITE TOPOGRAPHY MAP FIGURE3 -~ ~ " a ~~ ~ ,, cc· c-. ~ 13 "' G: t ~ ,~ ~ ' C ~ <, " ~ ., >--------p I J07-r-1, ~I '( r I I i '-() I :1 I l I I I / I l I I I l, :1 !r 0J '/ !1~ 9 I 111 C -///% ~ SI '1-_ ~ /,~ ',...._ ~l ',"' . S6 ~----- DC:MQL ,T,ON ~LAG NOTES I UTI IIY DEMOUT18N I ----,-@ REM8VE" EXISTING STROM DRAl:-.l PIPING. CATCc-i 8AS1t\S, -MAt<:HOLES. SLOITD DRAINS Ar--.D TRENCH DRAINS @ REMOVE OVERH~AO TELE?HONE/POWER LINES AND POLES, INCLUDING POLE FOUNCAr:ONS ·-~ I -...__ r--, ·---./ l ·, ----SURFACE ELEMENT DWOLITiON I ---- ® R[MOV[ EXISTING FENCE, POSIS, FOUNDAT,ONS AND GATES. ® REMCV( EX,STING 8UILD1t~C. FOUNOA:"ION, BASEME:\JT ANC BELOW GROUND UT:lll''.::S @ REMOVE ® REMOVE @ RFMOVE ® REl,.!OVE EXiSTING LUMINAIR[ AND FOUNDATION EXISTING CONCR[TE WALL. F:XtSTli\lG CONC'\F:TE SLAB. EXISTING ASf'HAL T f'AVEMENT. il -- r----------/----· ;:: I / -~ I ( UI 11_ / UI @ l l_TE~S TO REMAIN i 0 [XJS:11\G OVERl!EArJ TELEPHO'sE/POWER _INE AND l'::LE.5 :o REMAIN 0 EXISTING BUILDING TO R[lvA,i',;. 0 EXISTING COCK TO REMAIN 0 EXISTING LOG SlAWAL'... TO REMAIN. M EXISTING Si\MTARY srwrn PIPING AND MANbO~ES TO V f-/~.\i.1.1t, -~ lXISTING STORM DRAIN P1°1NG TO REMAIN 0 FX!STING FU.:Ct: 10 R[MAIN. 0 [XISTING L-r-STATION TO REMA'N. 0 EXISTING E"LFCTRICAL CONDUIT TO REMAlt-.. <3:> EX'STING w~~L TC REMAIN (AOJJST ,a GRADE) I \ "t· / r=-J ~ " Co t -3' ~ "' 2 '~ I '"' ~--/ "TI ' .:::--.._ . . . . ---____) '(. '~~~---------~-~-<0 <~ -L£S) ------==--------------1 I ·.1 i;l fil :(? ;" SOURCE S 1 TE DRAWINGS FROM MKA & CRAWFORD 50 0 100 TRAINING FACILITY SITE DEMOLITION PLAN / SEAHAWKS HEADQUARTERS AND ~ 1" 100' VULC1-19589-510 }o~'~"=· 1~0~/~4/~0~6==--JDFDR;WN;,,,:;.M~.//'.SiEEAA--T------+-------------,-;:c==c-7----l FIGURE 4 il.RETEC w iii ~ t " ,. (~ G Co " sa· '" ~ "' ? { ~ " ' i " ~ "' _, " ;'t:: :::s ,;, -, ;l: ~ ~ S' ~ l ~ "' " 0 ' ~ c, ~----, I I I I -' ""'"" ---1 L~~L!fFDAEN /--t--........... ~- NEW '70 SF BUITT rl --' !J"wETc!.'6lJ,<:EMENT "" , --.' , -_ "'-. 25<l SF BU S -""''' .,, _/ ,:J ' EDIMENT " --._ -• """' --... ; AREA CA,CHMCNT "'- • ' . ' ~ ,·. -k,-[~ "\ / l CONNECT 10 I cc@,o, " "~~ I -,,...,_,_-__ _\,.. ~· .,.,.. . • . ~ --~-'/ SEDIMENT PONOU,P I ---,....-------+ I ---____________._ /' ---------o~~K CHECK ~--/ J SEOIM ---• lYP AREA ENT CATCHMEN\u"I'l ~------~~WM --- 1 w CONNECT '$'"' INTER -- wr.t~t f':1STING ~fK OR 1?RE~Epe swALfEP~R I I ,, .. -,"·--·' I ,i;1), I NOTE, SWALE / ROINAR WATER y HIGH ""'' -~ I --cOCATIONS OF ,NTERCEPTOR SWALE AND ITS ASSOCIATED STO,MWATER CONTciOL FACILIT1C:S SHOWN ON TrllS DRAWING ARE APPROXIMATE. SLIGHT MODIFICATIONS MAY BE REQUIRED TO FACILllAE FIELD CO~D 1 TIO~S. --- LIMITS OF WORI< \ I 1 \ \ I 1 \ """"--~-r-----~-----............... ---.._; I I -." -------I --CONNECT TO BAKER --- TANK OR DIRECT PUMP ------- TO Sf.DIMENT POND ------1-- '\._ ----,,__ INTERCEPTOR ---..,__ ; \' J 'I ; SWALE. TYP \ ---\ '~/ 1 c 01 CHO ROCK CHECK \ __ _ ~.~ --. I UI.IITS OF /' WORK/ I I ~::i J ---i CE2@401 J -! -I / -~ SOURCE I t ' I r- ' I l ------------- f f CONNECT TO BAKER TANK OR DIRECT PUMP TO SEDIMENT POND ' ROCK CHECK @ ffi DAM, TYP n 2 oJ I c ·:£:fi~]5f401 CSEOIMENT -___ ---_ _:.io1 ATCHMENT AREA' INTERCEPTOR ---------1-----SWALE, TYP -----,~~, ------t I ' f t ' I i ----I r 1--1 i I / / : ;sue, • Wf'EEL / - - ROCK CHECK 1 1 ..... ~coNCRETE TRUCK & WHEEL ~ WASHOUT AREA \ ...---+--f SEDlf.!ENT POND ' ~WASHOLIT '":@ .. , II ;---,--/DAM, l'IP m@~, ' -coNSTRUCllON fi'\ / \. _ ,' ---~---I I ~ C~2@401 CONNECT TO BAKER TANK OR DIRECT PUMP TO SEDll.tENT POND / ~RANCE Cf'} ='o/Ei~, EA~t'i.i'fNT AREA___ _ j INTERCEPTO~-------rnf.f..l:i1:0N t2\ "'' "''*'"' --------1' SWALE, lYP r;:-, ca1!19'<0• ---::::--._ m~· I "' PROPERTY UNE"""""- '-. ', ~ \, "_,.,. ;;.: =-=---=--=--= -=--= = =-=---=--=--= ::_--= -_--=--=--= -:.__-= ::.:-=-=---=--1-----~ --= =--=-=--= =--= --= -=---= =--= -=--=--= -=-~ ~~~----~ -=-' \_ DISCHARGE OF CONSTRUCTION 7 ) STORMWATtR THROUGH L!H LIO. LIMITS OF WORK I INSTALL TEMPORARY METER PRIOR ' / TO INSTALLATION OF MH, ' I ' I \ J / " / ---" / ______ \. SITE DRAWl1\JGS FROM MKA & CRAWFORD ~ ~ 50 0 100 / "' ..... ~ RETEC I'"----I L--,-.,....,,.c-----,-:=~~~~-,------4----=====nF~IG~U[!jR~E[]sC=:j "' ---w 1 "~100· om 10/4/06 DR,,,, E.M./SEA ·~ SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 TEMPORARY EROSION AND SEDIMENTATION CONTROL PLAN i ' -·~~ .__.,,,,, \1 i' i?e 2 "/ :! ; "'8 ,. t::,; t;l ~ .. Q •• .. :i ~ ' ...... rn L_ ---NI" .9( 'J I w ...J ~ VJ "' 0 >-[L w u "' w ~~ ~ ., I I "l r 'f'f)d .. b3d \ ' ' . \ \ ' ' ": ' ~~ J ~~ " g " ,, ~, ,l "· §* I ' ' L • g §! " £~ \ll~ 1' •l i: ·~ !§ ,. "I,, ~ ~ ~ -. " i ~ 9 ::; < 0 "' u w I u "' u al. - ~) . ' ' >-"' w (/) ~ ~ V) < CD I u ~ u '" _____.4 --, J j ~r.,1~) -...:~ >-:::, 0 I VJ ~ • ·, " I ...J ...J ~ >-:, 0 " I:;; ...J >-:, ' 0 ,, 'e I ~'j ~~ ! I ' "' w '::; C: 0 z ;'Ji ~ w 0 < "' Cl (Il :::, • VJ s . tl C " ! ~ • "' w i2 "' < (Il z 0 ,;;: >-z w ::; 0 ~. !, • ; "") 8 § ~ • >-! x w z 0 c= u :::, "' >-VJ z ~ 0 J u i "' u al' < • ~ w u z ~ ;~ ,i; :..,~l.H:! -'$ ! i" ••• ~~ ~ ~ ~ffi i;: ~t:l -0. i Oo ~ .• l' ~o ! C < ,,_i .ir !i ~§lt: " . ' ~"'0/0t; :~fo ',., ~,.1:~ ~ J• Oo ~ j "'~ 8 S! ~?: ,.,, ,/!~< ~~..,j 1i'1"' ~il~ iS er < >-z w ::; I u ~ u >-z w ::; 0 ~. ' I " (Il z 0 c= u w VJ • 0 Cl::: 0 :_c_ s <( Ct:: u (/) C) z s <( (Y 0 w C- U) w u Cl::: =:i 0 (/) z 0 .: ~ z w :IE 1S (/) ~~ C 1- Z W <( C z...J oO -c:: "'1-0 z c:: 0 Wo C § 0 C. :IE w I- ~ (/) ffi i'= I--0:: ...J <( (.) ::, <( 0 u. 0 C!) <( z w_ IZ \2 ~ s: I- <( I <( w (/) D ~ ~ "' "' v, ~ " 0 ~ w ...J z :, > • " 0 ~ D " "' " :c w " 0 I I I 111 Attachment A King County Metro Sewer Discharge Permit Industrial Waste Program Wastewater Discharge Permit Application ® !!~~e~?r~a~~aYResources and Parks Wastewater Treatment Division n You will find detailed instructions for completing each section of this opplicatian and each required exhibit ,n the enclosed pocket "Wastewater Discharge Permit Application Instructions and Guidelines.· Review the entire application and instruction packet carefully before completing any part of the application. • Submit one application for each site. • King County Industrial Waste (KCIW) does not require an application fee. Once KCIW determines that you require a permit, KCIW will bill you prior to issuing you a draft permit. • Answer all questions and include the required exhibits. Incomplete applications will be returned to you. • If you do not hove on answer for the requested information, indicate so and explain why. • Indicate "N/A" if a section does not apply to your operations. • Use additional pages. if needed. • Send three copies of the completed application and exhibits to: King County Industrial Waste 130 Nickerson Street, Suite 200 Seattle, WA 98109-1658 SECTION A -BUSINESS NAMES AND ADDRESSES APPLICANT BUSINESS AND/OR PROJECT NAME: Seahawks Headquarters and Practice Facility ADDRESS OF SITE DISCHARGING WASTEWATER: BUSINESS MAILING ADDRESS: (If no address, indicate cross streets.) 5015 Lake Washinaton Blvd. N.E. 505 Fifth Avenue South, Suite 900 Site Address Mailing Address Renton, WA 98056 Seattle, WA 98104 City, State Zip Code City, State Zip Code PRIMARY PERSON TO BE CONTACTED ABOUT THIS APPLICATION: Shashi Muttiae Proiect Enaineer Nome Title (e.g., President. Consultant, On-Site Manager) 1011 SW Klickitat Wav, Suite 207 (206) 624-9349 Moiling Address Telephone No. Seattle, WA 98134 ( ) . City, State Zip Code 24-Hour Emergency Phone No. smuttiqe@retec.com (206) 624-2839 E-Mail Address FAX No. SECONDARY PERSON TO BE CONTACTED ABOUT THIS APPLICATION: Grant Hainsworth Proiect Manaaer Name Titte (e.g., President, Consultant, On-Site Manager) 1011 SW Klickitat Wav, Suite 207 (206) 624-9349 Mailing Address Telephone No. Seattle, WA 98134 ( ) . City. State Zip Code 24-Hour Emergency Phone No. ohainsworth@retec.com (206) 624-2839 E-Mail Addre&S FAX No. King County Wastewater Discharge Permit Application FJ SECTION B -GENERAL BUSINESS INFORMATION 1. NATURE OF BUSINESS Briefly describe your business and the main activities producing wastewater at the applicant site (type of processing, monufocturing, service, remediation). The site is a former wood treating facility that released wood-treating preservatives to the subsurface. As part of development activities, the Site will be developed for use as the future site of the Seattle Seahawks Headquarters and Training facility. The remaining cleanup activities ( environmental capping and institutional controls) as required will be completed in conjunction with Site development activities. 2. PERTINENT IDENTIFICATION NUMBERS AND PERMITS Standard Industrial Classification (SIC) __ EPA WAD No. Environmental Control Permits Issued far Applicant Site: Water /Sewer Agency City of Renton and Account No. NA Water Meter No(s). NA Current King County Permit No. NA Date Business Started at this Site Remedial and Site develooment activities will beoin in November 2006 SECTION C -PRODUCT AND PROCESS DESCRIPTION 1. DAILY AND SEASONAL VARIATIONS Number Circle Days You Generally Discharge and Provide of Number of Hours Discharging on Those Davs Operating Mon Tue Wed Thur Fri Sot Sun Holiday Days/Year Average 2 2 2 2 2 0 0 Maximum 10 10 10 10 10 0 0 2. BUSINESS ACTIVITIES AND PRODUCTS Business activities include manufacturing, processing, and remediation activities. Number of Em >lovees/Shift Day Night Swing NA NA NA NA NA NA Business Activity Type of Product or Brand Name Dailv Quantities Averaae Maximum Site Remediation Stormwater 55,000 gal 130,000 gal Site Remediation Decon Water 500 gal 10,000 gal King County Wastewater Discharge Permit Application King County Wastewater Discharge Permit Application II 3. RAW MATERIALS AND CHEMICALS USED IN THE PROCESS Chemical or Dailv Quantities Used Tank Working Brand Name Actual Name Purpose Volume Concen- Average Maximum !ration Various Creosote (PAHs) Wood preservative NA NA NA NA mixture Various Pentachlorophenol Wood (PCP) preservative NA NA NA NA mixture 4. INDUSTRIAL WASTEWATERS DISCHARGED TO KING COUNTY SEWERS (l) Enter a brief description and assign a number far each process (add more lines if necessary). Also show these process numbers in Exhibits A and B. (2) Indicate frequencv of discharge; either continuouslv discharged when generated. or stored and discharged in batches. Process Process That Substances Type of Frequency of Daily Quantity Number Generates Discharged to Pretreatment Discharge Discharaed in Gallons Wastewater the Sewer (continuous or batch) Average Maximum Site Stormwater none batch 1 Remediation possibly containing PAHs and PCP Equipment Decon water none batch 2 Decontamination possibly containing PAHs and PCP 5. LIQUID WASTES AND SLUDGES REMOVED BY MEANS OTHER THAN KING COUNTY SEWERS Enter annual. monthly, or daily volume, or volume of each removal. Indicate unit of measurement. Type of Waste/Substance Means of Removal Frequency Volume . King County Wastewater Discharge Permit Application 6. PROPOSED DURATION OF WASTEWATER DISCHARGE: November 1. 2006 to June 30. 2008 King County Wastewater Discharge Permit Application II SECTION D-WATER BALANCE 1. WATER BALANCE TABLE ( 1) Enter the appropriate letter far the water source: o.) City Service b.) Private Well c.) Reclaimed Water d.) Row Materials e.) Industrial Storm Water f.) Groundwater (2) Enter the appropriate letter for the discharge point: o.) Sewer b.) Storm Drain c.) Receiving Water d.) Waste Hauler e.) Evaporation I.) Product If the discharge is entering the sewer. also indicate the side sewer (ss) number. if available. (3) You must provide documentation of the water balance calculations provided in this table. (See directions for Exhibit I.) Type of Water In: Water Out: Consumption/Discharge Water Use Water Dischorae or Loss Water Average Maximum Discharge Average Maximum Source (I) (gals/day) (gals/day) Point (2) (gals/day) (gals/day) Industrial processing a 500 water /wastewater 10,000 a 500 10,000 Contact cooling water Non-contact cooling water Boiler and cooling tower feed/blowdown Water incorporated into product Sanitary water/wastewater Industrial storm water e 55,000 130,000 a 55,000 130,000 Plant washing water /wastewater Construction dewatering Groundwater remediation Site Irrigation Evaporation --- Other: (please indicate) TOTALS: -55,500 140,000 -55,500 140,000 King County Wastewater Discharge Permit Application SECTION E -SUPPORTING EXHIBITS Please see instructions for information on how to complete the following exhibits: Exhibit A: Exhibit B: Exhibit C: Exhibit D: Exhibit E: Exhibit F: Exhibit G: Exhibit H: Exhibit I: Schematic Flow Diagram (required) Site Layout (required) Planned Changes in Pretreatment or Waste Disposal Practices Analytical or Historical Doto Spill Prevention and Containment Pion Tank Capacities and Concentrations Hydrogeologic Reports for Groundwater Remediation Engineering Report (Required only if you have wastewater pretreatment systems or are intending to install such systems.) Documentation of Water Balance Calculations SECTION F -CERTIFICATION • I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to ensure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system. or those persons directly responsible for gathering the information. the information submitted is to the best of my knowledge and belief. true, accurate. and complete. I om aware that there ore significant penalties for submitting false information. including the possibility of fine and imprisonment for knowing violations. Grant Hainsworth Printed Name Project Manager Title Signature Date This information is available in alternative formats for people with disabilities on request at 206-263-3000 (voice) or 711 (TIY). King County Wastewater Discharge Permit Application INSERTS FOR APPLICATION Section C I. Discharge days and shifts are unknown. 4. Pretreatment is not expected to be implemented, however dependent on initial sampling results the water may be treated with granular activated carbon and retested. If analysis after granular activated carbon treatment shows the water does not exceed permit limitations, the water will be discharged into the sewer. Any water failing to meet the limitations set forth in the permit will be transported offsite for disposal at an appropriate facility. EXHIBITS Exhibit A Schematic Flow Diagram See attached Figure 1. Exhibit B Site Layout Sec attached Figure 2. Exhibit C Planned Changes in Pretreatment or Waste Disposal Practices This exhibit is not applicable for this project. Pretreament of the water to be discharged to the sewer system is not expected. It is expected the water will not exceed limitations since significant portion of the water to be discharged is rainwater. However, sampling will be conducted prior to discharging the water in batches to the sewer. If the concentrations exceed the limitations the water will be treated with granular activated carbon, retested and discharged to sewer or transported offsite for disposal at an appropriate facility or treated using granular activated carbon prior to discharge. Exhibit D Analytical Data Analytical data is not available. However, sampling will be completed while the water is in temporary storage on-site. Pending the results of this analysis the water will either be batch discharged into the sewer system or transported offsite for disposal at an appropriate facility. Exhibit E Spill Prevention and Containment Program Workers wi II be required to have 40-hour health and safety training in accordance with 29 CFR 1910 and Washington State Industrial Health Act (WISHA). In addition, site workers will be briefed daily on the hazards posed by the site and during the initial project safety meeting procedures for spill response will be addressed. The wastewater will be temporarily pumped to onsite storage facility prior to discharge. If a spill or leak should occur measures will be taken immediately to stop the flow of wastewater and intercept any flow. The contained water will then be pumped back into the storage facility. Exhibit F Tank Capacities and Concentrations All wastewater to be disposed of into the sewer system will be collected and temporarily stored onsi te. The Contractor wi II determine the number and size of temporary portable above ground storage tanks and temporary sedimentation ponds. Contaminant concentrations in each wastewater stream wi I I be determined by sampling and testing prior to discharge. Exhibit G Hydrogeologic Reports for Groundwater Remediation This exhibit is not applicable since the project does not involve discharges from a long-term groundwater remediation project. Exhibit H Engineering Report This exhibit is not applicable since there is no pretreatment system. Exhibit I Documentation of Water Balance Calculations The water sources for the proposed discharge consist of: (I) stormwater runoff from the Site, and (2) water generated from decontamination area. I. The volume of stormwater to be collected and discharged was calculated based on the total catchment area as shown on Figure 3. The total catchment area was calculated to be approximately 843,645 sq. ft. The historical precipitation data at a nearby climatic station were obtained from the Western Regional Climate Center's Internet site: http://www.wrcc.dri.edu/climsum.html. The average and maximum precipitation data between January and December at the Seattle Tacoma WSCMP AP Station are presented in Table ·I. Considering the worst-case scenario, the stormwater runoff was calculated assuming no water loses after the precipitation occurs in the catchment area, 1.e., precipitation equals stormwater runoff. The calculated monthly average and maximum stormwater runoff volumes are presented in Table I. The average monthly maximum monthly stormwater runoffs were determined to be approximately 55,000 gpd and 130,000 gpd, respectively. 2. The volume of water from the decontamination area is estimated based on past experience with projects of the similar type and duration. The average and maximum water volumes from these areas were estimated to be 500 and 10,000 gpd, respectively. file: H:\1951 5S009.dwg Layout: FIGURF A User emorshol/ Pio/led' Oc/ 04, 2006 -2:05p,., r's.· -------------------- WASTEWATER STREAMS ..,.., CITY OF RENTON PN'C' ,- G) STORMWATER & FRAC TANK / SAMPLING J GRANULAR @ DEBRIS/EQUIPMENT SEDIMENTATION AND ACTIVATED DECONTAMINATION-POND TESTING CARBON DECON WATER, NOTE: PASS INDICATES THE WATER DOES NOT EXCEED ANY PERMIT DISCHARGE LIMITATIONS. .RETEC ' FAIL SEAHAWKS HEADQUARTERS AND TRAINING FACILl'TY VULC1-19589-510 DATE: 10/4/06 [DRWN: E.M.LSEA I SEWER LINE I SAMPLING I PASS AND TESTING I FAIL ' OFF-SITE DISPOSAL SCHEMATIC FLOW DIAGRAM TFIGURE 1 ~<.,j '.. ~ " :'!c ~ ~ " "' " ~ '\; ,g "' QC "' .g ~ ~ C • ~ I ~ ~ I I ~ ! 31 I I I ,, • -6) >'+ ~ -p 0 0:0 0 ~ ~ • 011 0 0 SOUTH BAXTER PROPERTY WETLAND \0 o.,,/ \ \ \ \ .-!t, .. %~~ ·~,.. ---- WASHtNcroN Q~~~-r(~~~ \ NORTH BAXTER PROPERTY 0 0 ~-\'~~~- ~1"<>~·~ (Ji;,~ GYPSY ' ... , ---0 \ \ SUBBASIN _ _,,_______....----________...--,- 0 "'· 0 0 0 0 0 ffi)~ '• (a,-~~~ 0 .. -(c,,"' ••• ~~~ ···-->'..,·-, \ ----------- 0 LEGEND f /'.· .. I ASPHALT / CONCRETE 0 c::::::i TREES ! '.::: j BUILDING 0 CHAIN LINK FENCE PROPERTY LINE PROPERTY BOUNDARY \ \ I !1 ~. I\ "'· , I I I ··1 ' ·• I ~- ; 1,. i ~~ l @ ~ . /_~:;."'.,~ -~..,.,..,-----!5 ~ • i , • ~--. .81' Cc .;. • J --------... ,,..,n:----\ -~~~:.,.,_,.~~~~~ -·· •. , -~.=~ ~ . ? I SC O s,,,_ ---'-' #ii fF"'.".'l't • I "' •.. -Vj 200.0I. ... ?,;t, 'cs "'1'!_. \. : : ii, ~ ffl•I+ \ ~ ~ --+--• + ~+-.----.--+-+~ 11'~:::::=======--fE~===i::t::::f:~:~~~~:'.~~~~;~~~ " -·~-~ ,,....__ I :;j :l'i ~ RIPLEY LANE LAKE WASHINGTON ,r{~':';~ ~~_ro__:ir~~ l BLVD ~ • RETEC 50 0 100 / SEAHAWKSHEADOUARTERSAND : ~-? I TRAINING FACILITY I EXISTING SITE MAP tco;;.:A;;;IT:,1~0/./4;;/~066--fcioR;;;WN;:;,:-;E:,_M;;-_-;./S;;:E:;:A--T------l------------rF~l~G-U_R_E_2 ___ _j ~ 1"=100' VULC1-19589-510 I I I I I I I I I I I I I l·-' I 0 z w ('.) w _J < w QC < r-z w "' I u ~ u QC w i "' QC 0 >- (fl D __ l~---· _· I. .. ·i-. :;:ii'ii'i ,~'A:}i '.i.1· ! ' f i·] .1 i1,, 11,, ''.' 1 '·'. ' I: I:: I 1 ·i ' : l :11 ! I, ,, 1: : ·, i :· 'i) ': ' !, \ 0 0 0 0 1/) 0 0 II :~J"X wdcoT -900{ '§0 PO pa1101d ;;o~s;owa .;asn l/111/Jd :;no/07 OMP'/J/fll/Jd[J!l'll!Jd[ddMS'i58§'5! \H ·al'J Attachment B Hydrologic Analysis I " I I Hydrologic Analysis Seahawks Headquarters and Training Facility This hydrologic analysis narrative presents calculations of runoff at the site under the existing condition and during construction activities. Two-year and 10-year, 24-hour storm events were analyzed. The hydrologic analyses were performed in accordance with the procedures described in the "Stormwater Management Manual for Western Washington", published by Washington State Department of Ecology (Ecology), in 2005. The following paragraphs summarize the calculations. 1. Catchment Area: The catchment area consists of impervious area, wetlands, and pervious area. These sub-areas were measured from the site topographic map. The complete breakdowns of the sub-areas are shown in the attached calculation sheets. The total property area is approximately 19.4 acres. Impervious areas under existing conditions include asphalt/concrete pad, buildings and roads. During construction, although the above-mentioned impervious areas will be demolished, it was assumed 0.2 acres of . . 1mperv10us area. 2. Curve Number: Runoff curve number of each soil cover was estimated using Table 2.2c of TR55 1 . Curve numbers for impervious area (buildings and paved roads), brush/grass area are 98 and 70, respectively. 3. Time of Concentration: Calculation of time of concentration is included. Sheet flow Manning's effective roughness coefficients (n,) and time of concentration velocity factor (k) were obtained from Table 2.4. 4. Hydrograph: The Santa Barbara Urban Hydrograph (SBUH) method was used to calculate runoff hydro graphs. Calculations were performed using an Excel spreadsheet prepared by Ecology. A 10-year, 24-hour rainfall event was used for the calculations. Hydro graphs for existing and during construction conditions are also included. 5. Results: Results of the SBUH calculations showed decrease of runoff volume during construction due to removal of impervious areas. Pre-Development During Construction 2-Yr 10-Yr 2-Yr 10-Yr Total Runoff 22,700 53,500 16,700 45,600 (cf) Peak Runoff 0.40 1.23 0.35 0.91 (cfs) 6. Proposed Runoff Control Measure: Interceptor swales will be installed to collect runoff from construction areas. Sedimentation catchment areas will be constructed at the end of 1 Technical Release 55 -Urban Hydrology for Small Watersheds, by US Department of Agriculture Natural Resources Conservation Service Conservation Engineering Division, June 1986. I each interceptor swale to collect and remove sediment canied by the runoff. Details of the interceptor swales and associates stormwater control measures are provided in the drawings of the SWPPP. The runoff will be pumped from the catchment areas to on-site Baker tanks or pumped directly to a temporary on-site sediment pond. The pond will be sized to provide a maximum storage of runoff generated from a 10-year, 24-hour storm at the site, as presented in this analysis. The water stored in the tank or the sediment will be sampled and analyzed prior to discharge to City sanitary sewer adjacent to the site. A permit will be obtained from the City of Seattle. 7. Sediment Pond Sizing: Based on the SBUH analysis, the runoff from 10-year, 24-hour storm is calculated approximately 45,600 cubic feet. To accommodate the maximum runoff for the 10-year storm event, a sediment pond will be constructed at the site to temporarily store the runoff and eventually discharge to the City sanitary sewer. A pond stage-volume calculation is attached. As shown, a pond with bottom dimensions of 150 feet square, a side slope of 2: 1 (H: V), and 2 feet deep, will provide approximately 47,400 cubic feet of runoff storage volume, exceeding the 10-year storm runoff volume. A minimum of six (6) inches of freeboard is recommended to provide additional volume that may be replaced by the sediment at the pond bottom. The sediment pond shall be routinely maintained to remove any sediment settled in the pond bottom. 2 Santa Barbara Urban Hydrograph (SBUH) Analysis Pre-Construction Condition Based on 2-Year, 24-Hour Storm Seahawks Headquarters and Training Facility SBU_ti_Hydr~gra_!)h -EXISTING CONDITION (~:YR, 24-HR RAINFALL) -----,-----+----'! ____ j ___ Area -19.37 lacres __ L I ---l-----l-------l--~T~i"~'=to_pc<1k(hrsJ-I 021 Pt -I.99 mches{Totalrainfallfora24-howstorrnevent) :\-1axQ(cfs)= ! 0-1-0 dt -10 min___ I 1--··---f-------+-----1 Vol (cu-ft)---,: 22.700.76 t-------Tc -51 min. (Deve\oped~1teconditions)_ ------I j_. ---------+'----~-----!-;·___ _ __ ----·---__ . ____ _!'~_R __ YJ9USParcel 1 ,. _ IMPERVIOUS Pared , -----~---------'-----I _____ _ ~-- ____ ___ _ _ _ Are,1 =1 18.07 ."cres -1-_ Are.1 = 1.3 lacre~ , -----1-;· -------~----+--- (!\ =. 70 ([\ -981 i i 1------- -~~---S c::i 4.29_j_____ ,_ S = 0.20 I ---!,------,~-----~----1 ---+--------··-- --0 2S =I 0.86 • 0.2S -0.04: ; --··---+---- ~: ::; : ~:: ::,~;~i• w= -°'°''i -11 Ii ,I, -1, • =t--~---+'---+--------J Column (3) = Incremental Pn:cip1Lauon Fraction J ----+------+-------, Wu-m~\4)=(o!umn(3)*P, I ·-·-----j Column (5) = A1:_cumulated sum of Column (4) _.J _ ·-: I ~-------1-----, Column t6) = if (P.: 0.2S) = 0. If (P > 0.2S) = {Column (5) -0.2S)"1/(Column (5) + 0.8S), where the PER VIOLS AREA S value is used ~mn f]l_=:__\?1ul'l!!l_(6) of the present step -Column {6) of the .e_r~vious step I +-------------+----+-----1----- Column (8) = S~1~ as Column (6) exl:ept use IMPERVIOUS AREAS value I __ --1--------+----+-----1--- ! ~~~T!~'..l?J = ~'?lumn (8) of the prese_m step· Column (8~_of_the P.!:e_vious step I ---~-------+' ----+-----'1-· _ Column ( 10) = (PER VIOLS AREAfIOTAL AREA)*Colurnn (7)+{1MPERVIOUS AREAffOTAL AREAJ*Column~{9~)-----1-----1,-l~~l~~l -( I-!)-;;, (00.5*Cdumn00)*TOi:tlAre<:1)/dl~-~here dt = 10 or -60 minures I ----,. : +-======!, ===~---------=-~ Column ( 12) = Column (L2) of previous ti_me step+ w * l(Column (! 1) ofpre,..ious tirre step+ Column (1 !) of present lune step) -I · -------:~C:-olurnn ( 12) of pr~v_iOus time step JI where w = routing const~m ~ dV(2Tc +di)= 0.0641 -i-----+------1-----,-- (IJ (2) : (3) __ -+ _ _,(c,4J,_-----1 __ (,c5'-)----1---"'""-) (7) (8) (9) ---.--("1~01~-+---,(,,-l"l)---l---,"1~~)_-= ~===T~i"~~===~===,-:-,::-====:, =::ere::~c~ip~----l--il~"~'"'~--f-~A~c~,~·mu,"cl~--+-~P~E~R~Y~l~o,,u~s~Ao;R~E~A._+----''M::"-P~E~R~V~l~O~U~S~A~R~E~A~ _ ---~T~o~ta~l~+-~'"~·~·1,~'"~'-f---;:De"c's,~g~o __ _ 1----~!lcrem::nt (hr~.) 1 Distrib. :_7R~ai7m~o~ll-f---"R~ai7of~o~ll--f--~A~c~,~=";.·-J-~1"~'~"~-~+~A~cc~"~m~--1-~loc="~-~+ ~R~u~o~o~ff'--f--~Fl~o7w;·~ra~"'---f-~Fl-'o~w:;'""~"'-I ------+-----1--(~fr~"'~'~io~o0) _ _J._,(~ioc"c'"hc~s'-)---1---'(~ioccc:h<~,LI -f-~R~";"2o~ffc-I'. --,R~.a~o~ff'c---l--,-R~,~"o~f;f-f-~R~•;o2o~ffc----'(nioc~hc'"=sL) --+-----"(c~fs~)-+-----"(c~fa~J __ ---1 1 ! 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I 21 1 4.DJ 0.001 0.0139 o.2667 0.0000 0.0000 o.1186 o.ow1 0.0001 o.·1-----+-~o~, --+ 28 4.500 0.007 0.0139 0.2806 0.0000 0.0000 0.1295 0.0109 0.0007 0.1 0 l f------'';;'~-·~__,•:c-"""c;.1-+ ~':c:-c:oo'cc,~+----'o--:o-'-13"''--t----:"'-'';c',,"'----t----'""·oooo=,__+----''--:0000::c:::,__i._o".-'-'40='-+-~o~-o~r-'c,-'c' -f----:"--:-oooc;;c''--t---"o~,_-+-----'""''----1 10 1 4.BJ~'-+---:"co·oo~s,c-+---:"c::·"-'-'•,,'._+-----'"c;·'c;.':c"''----+----'""-oooo~'----t--""'-"oooo=_+-~o~,:-c'"Js'----+----'"--:-'-'-"c'2'----t--""-"0009=-+--oc'.~'-+-----'"---:'---1 ]1 5.000 I 0.0082 0.0163 0.]272 0.0000 0.0000 0.]672 i 0.0J]4 0.00()9 0.] 0.J 32 I 5. t67:-+-o:c_oo=s"2-+---:o:c_o",",,'---+~o"_c'34°'3",--t---o:c_oooo=-::--+-':o".oooo='------l---o'".-ccr s"o°',-+-~o~.o~,",o-c---+----'o".ooo=,'--+---"o~,--+-----'o"_ ,'-- f--~~,,'----'--{ 0 ~Jj_-J,==~1==ot.~oo~s~2::_-__ t=~oj.oj,f,_".J~---_i-1-----,~"t-~,=':'"'--t--o~oooo=-::--+-':o".oooo'='----,f----o'"_~,,~.~5-+-~,~0~1",~,-f----:o".ooo=-,'--+---"o~,--+--~o"_,:-- ---_f."i"----~--5_500 1 0.0082 o.016J o.376i·-+-~o~.oooo=::---+---:oc:_oooo='----+--o","'-o'"84·--1 0.0139 0.0009 0.1 o-:-i- --·-j\-_,·_-~'~-'~'-'-+-~o~oo="'---+~"=·",'-"='~~ 0_39"2·74--+--o~.oooo=-::--+-':a".oooo'='----'---"0"22°;2",-+---:o~.o",-"•c-r-f----:o--:_ooo'=,'----t---"o",----l----0.1 __ ,1~•---~'~'~JJ--+--1-' ~"~.oo~"~'-+---":c,·".o '~'~'-+ ,, =-=to-~•t,11~3==~·==to.foooo~~==t=joµ.oooo~~t==t=fo~.2i33~9==j==~O~-to"1~64~==t=joµ.oo~[,t, ==t==jo(,===~===jot_'-,~ _-_---:1 l-------')~7-~-~6~-000~-+-~0~-009c=c5:--t--0oc.".0~18~9_-f----;0-c,47.30s,2._-+-~0-.;:0000:8:;:-f-~0~-0000~::--+--C:0',.2,c55,;5::-+--;0-".0~16:;:6c_f-_,0~-00~1'-l -f-----,0~1:--ll---'0~-_:_I --I 38 ! 6.167 0.0095 0.0189 I 0.4491 0.0000 0.0000 02723 0.01;67~-+--C:O";_OO~l!~-J--ocO',.l--f'-----::0~-1~---i 1---~'~'----1~-·~-3 0 3,~J __ +---;Oco-009""c5'----l---"-O.c::0"18,_.9c__j_-':OC-.4c:68:;'0'-----l-----"O"-OOOOOC",_-t--'O"OOOO="'-----l----'O'"-'c:'_._9._I __ _"..o.,,o .. 16.,9_+-~0c:-OO=l'-l -f------'O"-. l'---_j---'O'-'-'-'~ 4() 6.500 0.0095 0.0189 I 0.4870 0.0000 Q_{)()(){) 0.306] 0.0]70 0.0011 0.J 0.1 41 I 6.667 0.0095 0.0189 0.5059 0.0000 0.0000 0.3232 0.0171 0.0()]) 0.] 0.[ 4:?. ; 6.833 O.Ol34 0.0267 0.5325 0.0000 0.0000 0.3475 0.0243 0.0016 0.2 O. l 43 ; 7.000 0.0134 0.0267 0.5592 0.0000 0.0000 0.3719 0.0245 0.0016 0.2 0.1 44 7.167 0.0134 0.0267 0.5859 0.0000 0.0000 0.3966 0.0246 0.0017 0.2 0.L 45 I 7.333 0.018 0.0358 0.6217 0.0000 0.0000 0.4298 0.0333 0.0022 O.J 0.2 Pre--D Runoff-lOYR.XLS 10/4/2006 3:41 PM (I} i (2) (3) ! (4) ,C_~!~-+-7.<6cc)=~Sc'~'~'l,_---l,-c+.(8~> L __ 1,09l, ____ .c«cco"->-+--~"~'~l _ j (12) J Accumul. PERVIOUS A 1 ~~:r:. ; IMPER-'v'IOUS AREA Total lnst,ml -De-,-ig-,.-- --~ R,1infall Accum. __ ~A-='='"~m~-le-~'="'~·ce~-+-~R=""=o=ff--FlOwrate--f---~Flc'o=,~,~.it~, ---l t (inches) t<:unoff , Ru~~ __ ,R="="o=ff~+-~"="°=o=ff-+-~l•cc"=cd="='l---1 \~~0--+--'='="~' --j , {inches) {inches) (im.:hes) (me hes) Time , Tmic~· -+--'Pre=c~ip~-''-~'='"~" Im::re1ncntl--(hf~0) __ -J-~D=is~tri=b-+-l~R="='"=fa,ll --------,-------(frilCtioJJ) I (inches) i -l6 7.500 O.QJ 8 I' 0.0358 0.6575 0.0000 0.0000 0.4633 0 0335 0.0022 0.3 0 2 .i1 ! 1.<i67 'o"'o","-,---J-0"06=,",-+-1 -'o.12s",-+--'o".oooo""'"-+, ---"oc-_oooo='-+-o".',:2i1 -00638 0.0043 o.5 --,---o,-----< ___ ..i8 ___ ! _ 7.8D L o 054 o 101s o.8326 __ -+-_o.~oooo=-+-~o_.oooo __ -+-_o~.6~29? _ __.o,_..10'"2'-,-+---:":coo='''-+-"o"'.,c__ j _ o :i ___ -<9 --~ __ ,_<X_JO ___ j __ 0021 I QD537 i'_ o.8863 0 0 000 001 2 0 0.()0{)2 0.6811 i 00516 o.0036 o.4 _____ ____Q__ 0 , 4 __ 50 j 8.167 I 00)8 ' 00358 ' 0.922~ 0.0008 0:7!_~Q__j_'0'".Q'")'.C4"_5_+---'Q"'(H)=30,_+_"Q.4 -s-,---~~~1 -· 0.0134 1 0.0261 o.9488 00019 0.0009 0_1414 1 002s1 0.0026 o.3 o.4 ---5~ 8.500 0.0134 0.0267 1 -~~ 0.9755 0.0032 0.0013 0~7672 I 00258 0.0029 0 3 0) s::i I 8.66:i" 0.0134 0.0261 1.0022 o.0047 0.0016 0_1930 0025s 0.0032 --6"4---+-~o-.,,--, 54 : s.833 o.ooss 0.011s 1.0191 0.0059 0.0012 o.s100 : 00110 0.0023 i ----'o_,,~__, _ _.o" .. "'1 ___ _ ss 900()-o.ooss o.017f--'1"'.o°',"'n::--+-'o".00~73::-+-c:i:oof"',--1--"o'".,~21"0c__,,-o"-."o",,-"o-+---:o".oo";'.=24_---+l--'o:-."3--f------'o.0_, su -,---",-"1"6,::-+---"oc-oo","ac_+-"o'.Ol1s t.0547 0.0081 0.0014 o.8440 0.0110 o.0025 : o 3 i o.3 -------,,,_--_-:_,--·::.,c,:c-"_~3,,3t3'_-_-i_-_---:o"'cc·:::oof:::,-",;--:-!_-Jo-cc."'o,;1-',~,~:_:f::j,j.oj,_,,2':_2'_-:_--,1--","0"10~1--+--"o".o"o~,o'--+-o"'.:c""''o:"-+,-'o"'.0~1~,o::-;-"o"oo:::'"'-+l--o:c·-:,'-+1--01 · ----·ss 9500 I 0.0088 0.0175 !.0897 ~-0.0120 0.0017 0.8781 00110--0.0027 0.3 i 0}- ---59 I 9.667 0.0088----l----"o-".0-'-17-"5-+-_.l'-'.l-"07'-'2'_ 0.0138 0.0018 0.8951 j ___ q:9ccl-'-7-'-l -l--"0"00"''"-'c_+--'-O=.J--" I_ -~ ------'"o,__+' ~"'---''"'~+i ---:c'·"oo:c'c:'--'--o°'.o:::1c:''c'-+-~'--:,"'°'.-':---+---:o:-0~1"'~'-t-"""0"0"'1'~+-0:-·'~'"''','-, --0.0111 0.0030 o.3 i __ oi--:'~-, ----C:"'--+-1 _.1-"o-".o_,,00::---j·l_occ·:::ooc;s,,s __ + :·----'o:-0"1~75::-+-'-'-·-'-"c:'o:-'-+---:o:,0"'1"'1",_f---"o.-"oo"-2=1~+-o:-.,:-2cc,-'-3-+---'o.01101 __ +--'o"'.oo='-'-1-1-_.o-'-.4~_j o.3 62 I 10.167 . 0.0088 0.0175 1.1598 00200 0.0022 0.9464 o".i:J-l-71 0.0032 0.4 °0~.3~---, 1---().1 -10.:rn o.0088 -,""_'-01'-',-'-,--l---'-',.-'-,,",-"1-~-0.0223 0.0023 0.9635 0.017"1 --+---:0-'00=33'-+-"o~.4--+ o:~ ----64 1-1-"o'",:-oo.-'----+l----'o.'"oo","s'----1-o.o115 1.1948 0.0247 0.0024 o.9806 o.OL7J o.0034 o.4 o.4-- 1-----6~':i I 10.667 0.0088 0.0175 J.2123 0.0272 0.0025 0.9977 0.0171 0.0035 0.4 -6~~ ~6 10.833 0.0072 0.0143 1.2266 0.0293 0.0021 I.Oil? O.Ot40 0.0029 0.3 -0-:-4- 1----67 1 J.000 0.0072 0.0l43 1.2410 0.0315 0.0022 1.0257 ___ 00.'.'0l~40~-l-~Occ-OO=J0'-----+---'0~.4~ f---cc0.'c4----j 68 11.167 00072 0.0143 1.2553 0.0338 0.0023 1.0398 0.0140 0.0031 0.~4-+-----'0'c.4----j 1--',",----l--c-1'-'1.c'JJ~3~+--:oc:.oo~n::-+---:oc:.o-'-14-:-3~+-i","•,cc,~+---:coc:o",•"2;-+~o"'.00~24'c--+---:,'i_o"s~33::-+---:co_"'o"140:c----+-o:C_ocoo"'3'°2-+---o.4 o.4 1----:,'°o----l--c-1~1.c-,oo~ ·1 00012 0.0143 ·1.2839 003,1 00024 , "'78 00140 00032 ---"0_~4--+-----'o'c,--l 1----:,~,----l-c_,1~1~.6~6~7::::~:-~_-_,,~0=·~00~1~2::::::::::o=:c.0"1~,~,-4-~1~.,~,~s3"'-+---:o~.0~4;12;.-+~o:00°2,'--+---'-'L~;;-'-1~,-+--'o~.o",~40'-----+-'o~.oo~,3---'--o~.~4-+----::-o.~4--l 1-----:,cc,-----t--11 833 0.0012 o.o'-'14~3'-+----:,",712",c_+~o.;:_0;43;;,:--4 0')00~20'-+---c',.09~5°'9-+-~o:C:_o;c,.:;4"-1 -1-.;:o~.oo::2,,;--+-.;:o"','----+-----'o",~-- ~3---+ [2.000 I 0.0072 00143 l.3269 0.0464. 0.0027 1.1100 0.0141 '" -6.-0034 0.4 OX - 1-----~ P 167 0.0012 o 0143 1 3411 o.049'1--f----~o.~00=,~1-+--,~-~,,~4~0-+-~,~.0~1~,~1 --_o"·"'oo'"J"'-+--'o",-_-+--o.4-- e------~{ 12.333 0.0072 -t-o"-_"-o,'-',"-3-+----"L"35:'5'"6-+--"o.0519 00028 1.1381 0.0141 ---t------:,O-'_OO'clee6:_+--""-.'-4-+-·o.~ --_·::,~,;_::::::::::::;_:1~2~,oo~::::::::::o~.oo~;_:1~2:::_-1-,"---:oc.-.0--14:cl:_+-''=·3'"6--99,_-+-· 0.0548 0.0029 1 1. 1522 0.6141 o.0036 0.4 -OA-- 11 l~.667 1 0.0072 -'''-"-O.,,_Oc:14--l_+-_-_'-c:l"'84'"2~-1~-o.os77 00029 1.1663 o·_oi'iT" 0.0037 0.4 ---0~ "---~-:,_-_~:1~,~~,~-~1'1:·:_;-1:~o;:;.oo;:;~,~-'~--'-'o"-o"-1"1,_,_+----"'-'-""'"-'-+-"o.o,oo,.cc1_+-~"~-00=24--+-_'-_'~"~4-+-_-o~:o~-1~11 0.0030 o.3 -o.4-=-~~-'','----1=3~0~00~-+--~o~.00=5~7 "·-l'--"o.,-,o'-'o"J-+--'-' :::·"°":-"C''----1--00,-,0"-62-cSc_+-_:Occ.00=24"----+---'''-'· '"-""'"'----+--"'o."-o'-'11"i'_+--'o"-oo"°-"J"-O-+---'""·'-__L-~0.4 80 13.167 o.0057 0.01!3 1.4183 0.0650 0.0025 l.1997 0.0112 0.0030 0.4 I 04 --~'~1----t-~1~'-~"~'~+-"o~.00""'57 -l--"o"".o._1""'-----l-----''"·4'"2-"96,_+-:-"o';.oo';~,~,~:_;-:lo;:"'oo;=,c:,-:_-:_"i,-:_-:-~1-".~,,;c, .. 0~9;:1-_-:-,o:-"o._i1 .. 2~+-o"-."oo"J._1_+-_.o'--.4-_~f--:-~o;•~'---_-_---<' 82 13.500 0.005?° 0.01 ! J 1.4410 0-0700 0.0025 1.2220 0.01 l 2 0.0031 0.4 0.4 '-----"'"3--l_._13"6"'6,,7_j _ _,o"'.00""-57c_+' ---"Oc-O._llecl:_+-_-_lc,4,c52~3,_+---"0:".0CC72,:6,_+-'0'--00~2:"6_+-_'.l_".2:C.::33:"2 __ +-_-'_o".o,_.1_.1,,_2_+--'0"'00=J2,_+-· O:.~---f-----"~'~---i f-----'8_4_--41 __ 13~.8~3~3-0 0057 0.01 l] J .4636 0.0752 0.0026 J.2443 0.0) l 2 0.0032 0_,.4,_ _ _j _ __'OCC.4-__4 85 : !4.000 0.0057 0.01!3 __ ._1.._47~5:-0_+_0,c-".,07cc7"8_+--"0"'.00""27 --J--'i--:20:5"55,---+--"0:"0-'-ll'-;2~+-0'--."'00"3';2 __ 1 --04 0.4 f----~8~6-----i-ccll44 .. 3163-,3 00057 0.0113 --i--'"·'--::'~'='-+--'0".0"8~0='-f--"o .. 0027 1.2667 0.0112 0.003_3 -~-_--0_,4_---1------""-'·'c_ __ 87 '--"""c--+-o:c.oo,::;s._,_+---:occ.0~1-'-ll,_+~1".4':,9._7"7_+--'o~.oc;,c:'"'-f-----'o:"oo-"2;:7~+--"1.2:::,,._1._9_+--'o".0"1._12,_+--"o.oo;cl~J~-1---0'--.-''--+---"o--::.4 __ ~ ----!4.500 0.0057 0.01 l 3 1.5090 0.0861 0.0028 1.2890 0.01 l 2 __ 0'--00=3"3_.__.oc-.4'----f------'04 -=~~8"._9_---1-_-'-14".6'-'6'c7-+--"0:".00C:C5:'c7'--j-----:O--::Oc-l._llc_+-''-'-'cc2-"04,_-+----'0~6889 0.0028 1.3002 0.0112_ --+-O:c·-c00:-,3:-c4--'--0:c'.4,__+-_ 1)_4- 90 i 14833 I 0.005 I 0.0100 1.5303 0.0914 0.0025 1.3100 0.0098 0.0030 0.4 0.4 --~,~,~-1f---'1 7s=oo"'o,_--1-",_""oos" ___ , 00100 1.5403 0_0939 0.002s 1.J19s 0.0098 0.0030 o.4 ·~ ·-~~-,-----'-__ .--_":""s 5 j.~]1:=;::::t::juj.oo;is_-! 0.0100 ::~~~ ~:~:~· ~-~;: ::~~!~ ~::§! ~:0000 3301 ~:: ,: ---~:: --""=~+----"0.-,00:"5:_ __ 0 Q]()() I 1-~o~T-~-f--_-_,l75-'-so-:o::-+----'o.;coo:ccs::--+----'o"o"1-:ooc_+-'1-'s._,._o-'-1 _+-----::o,.1011 0.0026 1.3492 o.0098 o.ooJt 0.4 --~ 95 IS.667 0.005 0.0100 1.sso1 0.1043 0.0021 us91 0.0098--+--o'--00=3-'-1-+-~o'--.4-'-----f-: --~--±-~ f-----96 15.833 0.005 0.0100 J.5900 0.1070 0.0027 J.3689 0.0098 0.0032 0.4 , 0.4 97 16.000 0.005 0.0100 1.6000 0.1097 0.0027 l.]787 0.0098 . 0.0032 0.4 0.4 98 16.167 0.005 0.0100 I.6099 0.1125 0.0027 1.3885 6.0098 0.0032 0.4 0.4 1-~,c:9----t-~,"',_'°33=3~+----"'o.=oo'--,'-+----'o".o-'-,oo::::---',--:1=.,"'1"99::--+----'o:c.1:C,-::c,,:c-+-o"."00"'2"'3~+---:1:c_,~,-",,-+---:o".00~9",-t---:oc;oo=32'-+-=o'-:,---+-----'o~,:------t 1-~,"°oo~---t--c,c',_~,oo~--+-~o.~oo:c,~+---c:o--".oC:-1 oo~---t--'1-c.6"'2"•s=--+----'o:c. ,:c,;:cso=--+-o"_'coo:C2C.:8-+---:,:c_40~,c-1 -+---:o--".oo~,:c:,:--+---::-0_-"00"'3°'3~+--,:'_,f-+---"o.~4----l f---fij"i---, -16.667 0.005 0.0100 1 1.6398 0.1208 0.0028 1.4\80 0.0098 __ ..."-0.".00'"3'c3c_--:_--,_f:_-:_-::_"o,;;.c_4'::_-:_-:_1-:.-:.-:_'co:--__ C4~_-__ ----l >-------· 102 I 16.833 0.004 0.0080 I l.6477 1 0.)231 0.0023 1.4258 0.0079 0.0027 0.3 0.4 103 11.000 0.004 0.0080 1.6557 0.1254 0.0023 1.4337 o.0079 0.0021 o.3 -~'-~4----1 104 11 .167 +---'o'-'004"'"'_+---"o.,-,oo ... s"'o-+-_._1-".6~6J,,6~-+---""·cc1,,_2,"1-+--'o".0"'0'"2~3-+--'1".44~15,_+--"'o.-,oo","9-+--'o:-oo""2c,,_+--"-o.J o 4 1-~-_-,o~,-_ _::::_-_-,,~-~rc_;~,c__--+-_o,_00""4'-----+-' --"0 0 ,,._00 00 ... , 8 '"0 0 ___ +---'-''---""1"',-+_0 0 "'._'-',- 3 1"0 2 ._ 4 ,_~-"o 0 ,._"oo 00 :2,, 3 -+--'1-'«~94,_-+----"o-"oo"',"'--'--o:C."oo,.2,;,_+ __ _-o:c_-3:--::::::~::::::o~.:'.:1::::::~ __ __!_Q~ -~ !7.500 0004 l.6796 _ l 4573 I 00079 i 0.0027 0.} Q.] 101 J7_",o"',,----+1--"0"00"'4=--~-o.ooso 1 .6875 o. ~-0:'0~0'"2",--'-, -'1-4"','c-, "1 -1'-"o."oo~,",~-'--,°'00=2f--l-----"0~1~---+---'o".,,----1 1-----1 os 1 1. 83~3~+--o". 004,c,c:c_+----'o";.oo:C,Jo::::1::::i,'c.-"6c,9"'sjs::::~;::fo'-' . ._1-:-3::-,j,~::~-·_-ot.oot~2j,::::t:::i1::411t1ot::::t::fo.ioot,j,::::j::::ot.oot~2~s::::!::::::ot. 1~::::::~::::~o:c,-:-, --- 109 18000 0.004 0.0080 1.7034 O.l3% 0.0024 1.4809 0.0079 0.0028 0.3 ~:! __ 110 18.167 0.004 0.0080 1.7114 0.1420 0.0024 1.4887 0.0079 0.0028 0.3-03 l I l 18.333 0.004 0.0080 1.7194 0.1444 0.0024 1.4966 0.0079 0.0028 0.3 ---"Q_-c,--l l 12 18.500 0.004 0.0080 1.7273 0.1469 0.0025 1.5045 0.0079 0.0028 0.3 0.3 1""'----J--'-":c·c'66"'7~+----:co."oo"'4c_+---:o~.oo-:c':c"~+-''"·'c'c3~53::-+----'o~.1"•~93::-+-o,,."00"2S"c--+---:1'c.s~1::2-;3 0.0019 0.0028 o.3 o.3 ~14 18.833 0.004 0.0080 1.7432 0.1518 0.0025 1.5202-0.0079 0.0028 0.3 0.3 115 19.0(H) 0.004 0.0080 1.7512 0.1543 0.0025 1.5281 0.0079 0.0029 0.3 I 0.3 Pre-C Runoff-lOYR.XLS 1014/2006 3:41 PM ii I (2) ()) ' (4) . Gil (6) (7) (8) -I ---(9) (10) ( I _U_----+-(l2) T11n-Time Precip I lncre Accumul. PER VIOL'S AREA IMPERVlOUS AREA Total __ ln~t,ini I Des_:t2__ lrx:n:~nt (hr_s.) Distrib. R;1inf.\ll RainfaJl Accum lncre Accurn lncre Runoff I Flowrate f-lowra!t (fr.1ction) {inc_hes)_ (inches) ' Runoff Runoff Runoff Runoff (inches) r (cfs) } (cfs} - I I (inches) (inches) (illche5) (inches) 116 19.167 0004 0.0080 1.7592 0.1568 0.0025 1.5359 0.0079 0.0029 OJ 0.3 19.333 -- 0.004 0.0080 l.7671 0.1594 0.0025 1.5438 0.0079 0.0029 0.3 I 0.3 117 118 11.noo 0004 0 0080 1.7751 0.16!9 0.0026 1.5517 0.0079 0.0029 0.3 I 0 J f--~~----19667 0.004 0 ·ooso 1.7830 0 1645 0.0026 1.5595 D.0079 0.0029 Q_J 0.3 119 ! f-------19.833 0.004 0 0080 l.7910 0.1671 0.0026 1.5674 0.0079 -o.0029 lU -·o 3 120 ! } --e------_, 12! :!0.000 I 0004 } 0 0080 !.7990 0.1697 0.0026 1.5753 0.0079 0.0030 0.3 0) ----} 0.004-i.8069 0.172] - 1.5832 0.0079 0.3 } 0.3 !22 20.167 0 0080 0 0026 0.0030 ~-I 20.333 0.004" !.8149 0.1749 1.59\0 0.0079 0.0030 o.3-c OJ 123 0.0080 0 0026 j 20.500 0.004 1.8228 0.1776 -- l.5989 0.0079 0.4 OJ 124 0 0080 0 0027 0.0030 125 :!0.667 0.004 0.0080 1.8308 -0.1803 0.0027 1.6068 0.00i9 0.0030 04 -- 0.) ---126 20.833 OJ)04 0.0080 1.8388 o.1829 00027 1.6147 0.0079 0.0030 04 0.3 ' -- I 1.8467 o'."1856 • o.0079 6.4 --~--- 127 I 21.000 0.004 0.0080 0.0027 1.6225 0.0030 0 1 ··--128 I 21.167 0.004 0.0080 1.8547 -0.1883 0.0027 1.6304 0.0079 • 0.0031 04 0.4 ! I } 1.8626 1.6383 04 l 29 21.:rn ' 0.004 0.0080 0.1911 0.0027 0.0079 0.0031 0.4 21.500 t 0.004 I 0.0080 i.8706 0.1938 0.0027 1.6462 0.0079 0.0031 04 -0.4 130 t---IJT___.. 21.667 0.004 0.0080 1.8786 0.1966 0.(){128 J.654] --0.0079 0.0031 04 0.4 132 21.s:n } 0.004 0.0080 1.8865 0.1994 0.0028 J.6619 0.0079 0.003l 04 0.4 ----22.000 0.004 0.0080 1.8945 0.2022 0.0028 1.6698 00079 0.003t 04 0.4 13., ----··--12.167 0.004 0.0080 J.9024 0.2050 0.0028 "I .6777 0.0079 0.0031 04 0.4 l 34 22.333 0.0080 l.9104 0.0028 i-6856 0 0079 0.0032 --04 0.4 ----"- J:lj ! 0.004 0.2078 -----~------· D6 22.500 0.004 0.0080 !.9184 0.2106 0.0028 1.6935 00079 0.0032 04 0.4 - 2:2.667 0.004 0.0080 1.9263 0.2135 0.0029 I 7014 0.0079 0.0032 0.4 0.4 137 __!l~ ____._ 22.833 o.OOso ------- 0.004 1.9343 0.2163 0.0029 I 7092 0.0079 0.0032 0.4 0.4 139 I 23.000 0.004 O.OOSO I 9422 0.2192 0.0029 1.7171 0.0079 0.0032 0.4 "Q4- 140 i 23.167 0.004 --o.ooso !.9502 0.2221 0.0029 1.7250 0.0079 0.0032 0.4 04 - 23.333 0.004 -0.0080 J.9582 0.2250 0.0029 1.7329 0.0079 0.0032 0.4 -- 0.4 141 } 142 ~I 23.500 0.004 .L 0.0080 1.%61 0.2280 0.0029 l.7408 0.0079-Q_(X)33 0.4 04 --j43· ' 23.667 0.004 0.0080 1.9741 0.2309 + 0.0029 1.7487 0.0079 0.0033 0.4 04 -----···1 o.OO}Cj" 144 ' 23.833 0.004 0.0080 1.9820 0.2339 0.0030 1.7566 0.0033 0.4 04 -----·-24.000 0.004 0.0080 1.9900 0.2368 -1.7644 o.oo?f 0.4 ---0.4 145 ' I 0.0030 0.00]] Pre-D Runoff-lOYR.XLS 10/4/2006 3:41 PM Worksheet: Time of concentration (Tc) or Travel time (T 1) By Project Location Circle one: Checked Present Developed Circle one: Tc T 1 through subarea NOTES: Include a map, schematic, or description of flow segments. Sheet flow (Applicable to T, only) Segment ID I. Surface description (table 3-1) ................... . 2. Manning's roughness coeff., n, (table 3-1) ............. . 3. Flow length, L (total Ls 300 ft.) ............................ . ft. 4. Two-yr 24-hr rainfall, P2 ..................................... . m. 5. Land slope, s, ...................................................... . ft/ft 6. T,: 0.42(n,L)"' Compute T, .............. . mm. P U.311 0.4 2 So Shallow concentrated flow Segment ID 7. Flow length, L .......................... . ft. 8. Watercourse slope, s0 ••••••...•.....................................• ft/ft 9. Manning value for shallow concentrated flow, k, ...... . 10. Avg. Velocity, V: k,(s,)112 Compute V ............... . ft/s 11. T,: L Compute T, .............. . mm. 60V Channel flow Segment ID 12. Cross sectional flow area, a.................................... ft 2 13. Wetted perimeter, Pw ............................................. ft. 14. Hydraulic radius, r: alp. Computer................ ft. 15. Channel slope, s, .................................................. ft/ft 16. Manning's roughness coeff., n ............................... . 17. V = I .49r,t/.)So l!t Compute V .............. . ft/s n 18. Flow length, L ..................................................... . ft. 19. T,: L Compute T, .............. . mm. 60V ----- 0.15 300 1.99 0.016 600 0.016 16 20. Watershed or subarea T, or T, (add T, in steps 6, 11, and 19) .................................... .. Date Date _____ _ ; min. 32.11 4.94 I ci z w c., w ...J / w t--w °' u z 0 u '- '::i <( I a.. (/) <( D w u z w w "-z :J "' z ~ c., :J z °' a w z a.. ...J <( 0 s I Q'. al u. a.. 0 . z 0 ;:: i \,/ /', \ u ·' >-w °' °' <( a 0 z ::, 3:: 0 0 CD ...J "- ~ w c., Q'. w <( a.. z 0 ~ Q'. a.. 0 t \ '\ 1> ' I. ' ,. \. l--.it----- l· ,- . \J \· k " I " .., ,, ... "· w;; t:: ,, C .-.\· m~ ~-· ::c -I-D. ~o 0 a:: z 0. /; ' ., ,,,:. ' I ., ' 'I I I i v ' ' ~· ' ' ' ,:: ~ . ' ' ' ., ' ' • " : ~ So ' ' ~ • .. F ,~~?; ____ !!7·· . ,, \! 1·; I I } I, I i I' ii' ,i I I C. < :E >-J: C. ~ (!) 0 C. 0 I- w !:: "' (!) z i= C/) ~ 0 0 0 0 "' Ill CJ ~ I u t-- I .; 0 w 0 Ct'. I. (/) ::, (tl z en 00 0 ON w, (/) ,n <( 0 (D '-m Q_ 0 <( ::, i';:j w> (/) °' <( ::, (D (/) gl z, M w 0: :::, (!) u:: I 0 0 0 II ·~ ::, ::, ~ 0 ...J <( u ;:: °' w > :s,p1)( Wd[l;:f -900<? '£0 /:JO .P>/10/d 11oqs1ow, ,J>S(I [ 31/(l:JIJ :ino,07 OMP[OdOJ-)(39SL91 [ddMS\68>'61 \ H ·'l'J Santa Barbara Urban Hydrograph (SBUH) Analysis During-Construction Condition Based on 2-Year, 24-Hour Storm Seahawks Headquarters and Training Facility SBUH HydrogrnJJ.h -DURING CONSTRUCTION CONDITION (2-YR, 24-HR,_,RC"AC"l"'N'",F"'A,,L,.L),____+-----+--=-L----+ I AreJ :I 19.17,acrcs i I Timetope.ik(hrs.)-1_ ---o~ ----------Pt :I 1.99 linches ·tTot.il rainfall for a 24-hour storn1 event)-Malt Q (ds) -I O.JS ~---'--dt -cl 10 'm111. I --1------+-----1--____ !~v~o~l~(c~·"~-f~l)~-=+t---'-,""G.70i.5!_ =~----=-··-Tc =I 51 jn~ll!-(_Deve\opeds!lecunditions) ---l---i 1 . ___ _ PERVIOL'.-:i l'.1r~c·l IMPLRVIOllS P,m:cl ------!-------+----____ _ Are,1 -=I 19.17 ,1cres Arca -0.2 acres ~ --',"'.,"-=isl,-.-~,o,+=---f--'cc"'-,"-=i_ ,-.--c,98,-F=--+----+---- --s _r -t 2.9 s --"=l---o~.~,~o+----1------+-----!------~-------+-----1 -------+, -~occ.,~s-"...,1--o s6 o.'i·~s-~=+--0~04c-+------,'1-------1-----+-----+- ' ---+----~"-=+-0=·=0~893 -l-----+-----1---·---' ------1------1-----+-----1-------j ~c=,=1,-~-r=1=i -=~T=ime~!OCrement ===-==~~----+----+------+---+----+---+---l-----1----1------- Column (2) = Time2(~"'~·0~)~~~==~-+~---+----+----+- Column (3) = lrn:re"mental Precipit.ition Fraction -+-----+----+-----+-----+-----+------1-----+-- Co!umn (4) =Column()) • P, I Column (5) = Acctuf1tila1ed sum of Column (4) --=--=--:..::.:-_ ---"---,, -~---~---" Column (6) = lf (P < 0.2S) = O. If (P > U.2S) = (Column {5) -0.2S)"-/(Column (:S) + 0.8S), where the PERYIOVS AREA S value is used ~u;~,-~-'.7) -Column {6) of th\! 1:1re;e11~ step -Column (6) of the prc~IOUs step __j_____ J, -J _____ l--l----+- ("ol1_1mn 181 _= S;1_n~ a_~ Column (6) nc~·p1 use l!VIPERVIOUS AREAS value ____L__ r· I Column 1<f1 ; C;olu11111 18) ofi°he pn::,e111 ~lep -Column {8) of lhi:: previous step ---' - fol~n)Jl-1 I-OJ -(PERVlOUS AR°EAf!"OTAL AREA)*Column (7)+(1Mf'ERVIOUS AREA/TOT AL AREA)*Columll {9) TulUmn-i I IJ = {60.S•Calumn ( 101~To1JI Area)/d1. where dt = IO or 60 minutes I I -'-----+--------l---------+------~ COiumn (l 2) = Column (I:!) of previous 111ne step+ w * [(Column ( i-1) oforevious time step+ Column (11) of present time steo) - ----1-----; ~ - -+---+----l----+---+------1-----+----I----- ---+----~ ---(2 ~ Colurrm {12) of ert~vious tirr~ s1ep)J where w = routin2 constant= dt/(2Tc + dt) = 0.064l I---=---''-~~-I f--=',(l'")--+I _ 0 (2~)-+~~(3~1-+~~(4~)-+~~(~5)'--c---,f-~(6cc)=-.',o='~[J"c)-+-~;;18;)='*'~c'cl9~)~+~l'llv_OJc__+~'-'ll""l)'-c--+~c2(.'.'12"-)_-j Tim.= Time Precip Incre. Accumul. PERYIOUS AREA lMPERVIOUS AREA Total lnstant Design lncre~ ~(h~~~.)'--+-,;D~(~s,~,i~b~. -+---'"~'~i~o~f",111=_-=,t-:.~~R~~,~i~off~'l11~-:_t-:.-=,;;A~,~,".e,tmt.~~~~:~l~oc':,~,,~.~---j Accum lncre. Runoff +~Fl~o~w~'~'~"'---1-~Fl~o~w~,~·~"'---I f---· i -(fraction) (inchey),_f-_(~ioc""he°"'s),__+-..;;R~uo;o~f~f-1-~R~,;"~o~ff~+---:~Rc~u=~,~otff~:~::JR~uo;~o~~ff-_-_J-~--~=(~icoc~~he=~=,~,--+-(~c~fs~)-+--"'('~fs~)----J (inches) (inches) (inches) (inches) o.ooo;...+~-'o'__--'f-o"'."'0000'"" __ 1--_-o_-.oooo="----+-""'·oooo="---+--"'"·"'oooo'""_f-'"o._-0000'""_!--"-o."oooo=_+--"-"·c:oooo:e::::---1 o.o o.o f---:! -· ! --~:L~7 0.004 I 0.0080 o.ooso 0.0000 0.0000 0.000) 0.0000 0.0000 o.o o.o ----_L____ _ _ OJ) 3 i O .OI )..[. J_____Q_:_008Q ____ +---'""'"~I 5: ;•'--+--'""'' OOOOo:::::__+_0"'·'"0000'""__ ~-"'oo"'.00000000'""'__+-"D"OOOO='--+-'O".OOOO= '-+-";·_:,O_---+---"""' o __ -t. 0..500 1 o 00.1 o ooso::---+-""o..,o..,2,w,::-----+-""'·c:00000:::::__+---'o".oooo"'"' -· 1 0.0000 o.0000 o.o I o.o -~--~--. -_ o 667 T'lifl.:1 _T_§.05)80 om 18 0.0000 0.0000 1_..,o..,.oooo""''---+--""oooo="-----+---':o,.0000: · -+-"'"=·oc...---,_--;oc;.o"----. o o.8n , 0.00.:1 !,, 0.0080 o 0398 0.0000 00,0000:=· ::--·--f-"'o".oooo='---+--"'"·c::oooo'""_+-o"_oooo,_,·..,--;--1----"""'o_---+ _ ___-oc;.o'--- -7 ___ , I [_00() 0.004 0.()()80 0.0478 0.0000 0.0QOO 0.()002 0.0002 0.0000 0.0 0.0 -- -g -1 1.161 0.004 0.0080 0.0557 o.0000---··o'"."oooo~:---+---'0"00'""1~0-+-'o".ooo=;,'---+--'o"'.oooo"""::---+-~o".o"---+--oo-- -·-9 1.333 ()j}04 0.0080 0.0637 0.0000 0.0000 0.0023 0.0013 0.0000 0.0 0.0 !O 1.500 ~ 0.004 0.0080 0.0716 0.0000 0.0000 0.0040 _..,0..,.00=17'__+--'0.70000=-+--0'".0"--_+--'"0c'cO----, 11 1.6"67,-+--;"'"·oo='-+~"c'·oo=s,_,o_+-_o"."01:c'cc•-+--'"·-:coooo=,--+="'"·oooo="---+--;o:c;.00=•2'"---+--"o . ..,002~1,--+=o'".oooo="---+--':00.00,--~1----;"cc·o;--_; f----'1~2----+-_ J.833 0.005 0.0100 0.0896 0.0000 0.0000 0.0094 0.0032 0.0000 0.0 0.0 f----'1='---+---"'~ooo~-+--iocc.oocc',-+--i"-'·"~1~00i 0.0995 0.0000 0.0000 0.0131 0.0031 0.0000 o.o o.o f----'1-;-'--->--='~"~'--1--~oc.oo='-+-~o .. owo o. 1095 0.0000 0.0000 0.0113 o.0042 0.0000 o.o o.o 15 1-~'~·Jsl~J-+---;:"c;:·o;o',__+--;:o~.O,,i;::oo,__+--;:":c1,;1"94c---+...;o~.oooos;:,__+--;:"c::·oooo~,__+--"'-oc;:0;21~,,__+--'o~-004~~6-l-~o~.oooo";;,__-+ ---io.'cco----+---io'-io~--+ ~---01 --='·=500~---,-~oc.O~Oc5_+--0.0,l'.00:;;.--+-0~.712~9"4,__+--"'-0.~0000:2'--+-:0:;'.0000~;;.--+-0.0268 0.0049 0.0001· _ -;:'0.~0--+---;:0c;:O'------J 17 __ ;_____2~___Q:21_)_~_ i ~:00110019 0.139) 0.0000 0.0000 0.0321 0.0053 0.0001 0.0 0.0 -18 -----.. :.-_8l_3 _ ___j___o_.01~6 -1 -----· 0151:! 0.0000 oOOOO __ ~'c---=O~O~J~8c8_+-""=()()<,=~'-+-~0~.oo61 0.0 0.0 ---J2.___ 3.000 i o.on<i __ _;_ 0.0119 I o 163=' -+--'o'".0000="-___ 00000:;:~-,__+--;:'.;04:;s";..+~o;::oo~J~1-+-.;"~·ooos;:c1 -1---;:"~·0,-----1----,":c;·o,__ __ 20 1 3.167 I 0-".0"06e __ +' _0:c.~0"1~19-___+-'0".""~'"l_..j._'O~.oooo.,__-C'..---_ ··0-0000 0.0533 0.0074 o,ooo="'-+--'"'-'~0---1 __ 0~.~"---- 21 i 3.33] . 0.006 0.0119 0.1871 0.0000 00000 0.06!0 0.0077 --0.0001 0.0 0.0 -- 22 i 3.500 0.006 0.0119 0. l 990 0.0000 _ 0 0000 0.069! o.ooso 0.0001 0.0 0.0 23 3.667 I __ -,o=oo,,,'--+-o"-.-"0"11'-'9'---l--"o.c;2.;c10"9'----+-"o".oooo'° 0.0000 o.0773 0.0083 0.0001 o.o o.o 1----''~'-----+'-~'c:·'~l~'-+--""'·=00"1'---+-"o-".0"11~•:__-1-.:;0~-2"u~,;...--1---'o'".oooo="---+-"o-".oooo='---+--""'·~"'~'"J-+--'o'"-0099=,__+_.,o.=000=1'---l---o"'.~o_--1-_..:c:eo.~---- 25 4.000 0.007 0.0139 0.2388 0.0000 0.0000 0.097S 0.0102 0.0001 0.0 0.0 f--~2~6 _ __, __ 4=.lc67c -l---"'O:c·-cOOc:7~+-"0._,:0.!.IJ'-;9'---l---':O.c;2"'527 0.0000 0.0000 0. 1080 0.0105 0.0001 0.0 0.0 27 4.333 0007 0.0139 0.2667 0.0000 0.0000 0.1186 0.0107 0.0001 0.0 0.0 28 4.500 0.007 0.0139 0.2806 0.0000 0.0000 0.1295 0.0109 0.0001 0.0 0.0 f---~~---+---"4.766c'J~+._.;Occ.00~7~+--"'0.0139 0.2945 0.0000 0.0000 0.1406 0.0111 0.0001 0.0 0.0 _ _:~_ --'--'-';c·':c'c;'-+--"'0.0082 ---+-~"'"·':-l'-'6'73-+--":c·:-':clOc,8_+--'"'"0000:-;:-c...+_O:c.0000::-,:::;;..-+---'"~· 1"5"38::--+-"0._-0_,_l3"2'---+-'""'ooo,:""l_+-___-OC'.O'----f--'o".O'----I 31 5000 o.&182 o.016J 0.32n 0.0000 0.0000 0.1612 0.0134 0.0001 o.o o.o 1 _-_---:;;::" __ ~:: __ .1:.~'.__L _ _'?_.oos:! . -l--co_-0"1"-6';...+--;""·'"'-;;"s:-----+-'o".ooooc:-',__-+--'""·ooooo::::'---+--"'-"·"'::'''"''-+--'""·"eclcel"6_+--"'0"_000;;1'----+-"o.=o----+ _ _.,o"o_---1 33 5.n1 o.oos2_+-~oo-"'o'-'16~3'---+--io~.:c":c9-i8--+__-o".ooooc:-',__--l-"o.70000~'---+---'o~19~4~5-+-'o".~0~1J;8:...+--'o".ooo".'."~1 _+-----'o'-'.;o_--'_---'o~o::.._-1 34 s . .soo '0008:i --;!_oc-.-co-"16:c'~+__..,O . ..,JccJ6:c-1~-+--"""'-oooo="---+--'o.7oooo=_+-~o,c.::c;wc:'c'4-t--.;:oc;.occ,'cJ9'---+--"'-"-.;ooo~1_+-o;co,___+-_o;,·;"--- 35 5.667 0.0082 0.016] 0.3924 0.0000 0.0000 0.2225 0.0141 0.0001 0.0 0.0 - f---"'36::----f-"50 .. B~J~J _ _,__~O=()(cl~9=5-1--~0~.0~18~9 0.41 IJ 0.0000 0.0000 0.2389 0_0]64 0_0002 0.0 0.0 37 6.000 0.0095 0.0189 0.4302 0.0000 0.0000 0.2555 0.0166 0.0002 0.0 0.0 l--~3~8-----l-"6cl~6_7_+-"0c()()=95~-+-0.0l89 0.4491 0.0000 0.0000 0.2723 0.0167 0.0002 0.0 0.0 39 6.333 0.0095 6.0189 0.4680 0.0000 0.0000 0.2891 0.0169 0.0002 0.0 0.0 40 6.500 0.0095 0.0189 0.4870 0.1)000 0.0000 0.3061 0.0170 0.0002 0.0 0.0 l--~4=1-----l-"6".66~7~-+--0.0095 0.0189 0.5059 0.0000 0.0000 0.3232 0.0171 0.0002 0.0 0.0 42 6.833 0.0134 0.0267 0.5325 0.0000 0.0000 0.3475 0.0243 0.0003 0.0 0.0 43 7.000 0 0134 0.0267 0.5592 0.0000 0.0000 0.3719 0.0245 0.0003 0.0 0.0 44 7. 167 O.Ol 34 0.0267 0.5859 0.0000 0.0000 0.3966 0.0246 0.0003 0.0 0 0 45 7 333 O.Ol8 0.0358 0.6217 0.0000 0.0000 0.4298 0.0333 0.0003 0.0 0.0 Construction Runoff-lOYR.XLS 10/4/2006 ]:41 PM __ ..i~-_ _ ~ •. ',,;,0 7 ; 0 0 .0 0 . 1 1 ~ 0 0 __ 0 0 . 6 15 7 8 7 _ _ ___ 9_~~1s o 0000 , 0.0000 o 4633 0.011s 0.0001 o o__ 1 o.o . .n u .. ons::: : 0.0000 0.0000 o.sn, o.0638 0.0007 __ ~_1 ___ o~o~--~ .ix -------1.sD oos.:: ---t o 1{fis··+-08326'-+-"o':ooo~o'-,,-o"'."oooo=-~.-:o:c.,c:,"',,:--+-"oc:.1.co2~4._+-_o:c.cc:00'11 0.1 oo f--~9----Tooo _:-_~-__ o··ox7-+--:o:-o",~,~,-+--o:c.c,,-:,•;,-+----::-0"000=2--,-0"'0"00=2-'----:o".,c:,-:11:--+----::-o . .co"51"0'-+~--o--:-000?-----·"0"'1'---,'--'-o~.~1----1 1-----50--s. 167 , o o 18 o 01ss o 922°,-+-o~.00=1"0-'----,o"ooo""s'-+-"oC:.,c:-1Scco'-+-·o=•.;co,;,•.,:-__ -__ 0.0011 o i o 1 f-~5~1 __ -,_ 8.3]·3---l-0 013.1 0.0267 0.9488 0.0019 0.0009 0.7414 0.0257 _ 0.00\2 0.1 I O l f-~52~_,C8.500~-=..j___ 0 OJ3.t 0.0267 0.9755 0.0032 0.0013 0.7672 0.0258 0.0015 0.2 i D l 53 s.667 4-,._o:_,.o 1"lc:'-t--:o-:.o.,2~67:--+-'1-".00""2=-2 _+--'';;.·oo~,"''-+--:"-:·00~1 •:--..,!-ico."-,-:C'J~o-+--'o:C.o:CC2C:,~'-+--'-o.0.o"o-'-1 s~_,__-'-0~2._---1_._o ... 1.____, >-~,~,---+-~8'.8~3~3-0 0088 0.0175 1.0197 0.0059 0.0012 : 0.8100 0.0170 0.0014 0.2 0 I , 9. ooo b .-oc.:oc.:88:c--+--:-oc;o_.17c's'-+---:-, c:.o7J ,"',,---+--'o".00=73'---+----'o.c:00::.1",'--+, -o:c,:c,c.:,cco-+-.;oc,;.0"1.:.,0:--+~o~oo 15 o. 2 o. 1 55 56 ! 9.167 0'0088 00175 1.0547 0.0087 0.0014 0.8440 0.0170 0.0016 0.2 0 l >-~,,~~---9.333 00088 0.0175 1.0722 0.0!03 0.0016 0.8610 0.0170 0.0017 0.2 02 ~--+-.:c.~,oo~--+-o~oo"s"',-+-"oc'co"1"'1"',-t--'1"'0"s.:,9=,-+--o'°.0"'1c.:,c:-o-+-.;o-:.00~17:--+--:-,.o:,"n"'1-_-_,-+_-_-c.o".cco\1~,jo::::::!:::joj.00Ji1~9c-_-_-,_t-_-_-~c:oj2~::::::~~::::::~oj2t::::::~~ ~-·-T-=,'c. 66-:c,:--+--:-oc:o"o,:c,:--+~u". 0"'1~,",-+---"1."'1 0"1",-+----::-0.=0"1 ics,-+--o:c.00~1"s-+-"o-:. s",=;i-1 o.o 111 o. 0020 o _ 2 o. 2 ---60·---+--o,cc,c:,"'J-+- 1 ---:oc'c,~""'':c--~,--:-c:-o.=o_.11c','-+---'1".1=24~7:---+---:o'o.oc'1~57:--+_-__ =o.=oo=~C.:9-+.,~:::~o".~,\,c::,,c,::::::_:;:::jof'.of1j,l'1:::.-";:-:::fo~."o"'o\2":_1~_-_;_-_-_-~o"~·"'':::::::::_:;:::::::::fo"'.c.:,~::::::~ ___ (d_ _ _ _ • __ l_0_.000_-1-_<.01 ~IJl"'JR~8-~~0"'.0~1~7c.5 _-..cl~. ~I 4~2 03 _+--'0~.0=178 0 OOtl-+--'0~9~29~3 _ _,__0c.·c.0~17~1-+-~0"'0"'0-'-2c.2 _,___,_0~.3---l---'O"'. 2'-----f 62 10.101 o ooss 0.0115 l 1. 1598 omoo_ ____ ):M~--+---0~·-"~'~"-+--~o"'.0=1~7~1 _,_~0"'0~02=,.__,__c.o·~'--+---'o~.2 ___ _ ~·----.,.10:c·oc31~,~-'--'io.'c.ooc,0:1B 0.0115 1.11n 0.0223 -f-"o-~.00~2=J-+-_o~·-"=J~'-+--~o ... 0~1~,~1-f-~o."'0~02=4.__,__c.o.~1_-+_--'0 0.2 _____ _ 64 10 . .500 1 0.0088--, 00175 TJ-:T<)4g-·-·~o:oI,n 0.0024 0.9806 0.0171 0.0026 0.3 0.2 65 10.667 o.0088 --~---·0:0175·--1.2123 0.0212 0.0025 o.9977 0.0111 0.0021 o.3 -o.T f-----:,.,-,--+-_.10:c.,001"1-t-·,o.·oon---·o.OT4f. 1.2266 0.0293 0.0021 1.0111 0.0140 o.oon o.] i ---Qj t----:,c;,---+-.,.,c'l.OOO~-l--iocc.OOcia7:_ --o'-.o'--~14"'3-·+-~1=24=1~0-+--'0.~0~Jl~5-+--0~.00=2c2_+-~l~.0~2c57_-+-~0."'oc140-'-'--1-0~.00=2~3-+-'-0~.3~-f-,. --6.J-~ 1----:,.,,,---+--c-1 c'1.cc1,~,-t--io. 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-~_OJ -- 107 l 17 667 0 QO.'.I 0.0080 1.6875 0.1348 0.0024 l.465 l 0.0079 0.0024 0.3 ; OJ -108 J7 833 0 004 0 0080 l.6955 0.1372 0.0024 1.4730 0.0079 0.0024 OJ I 0.3 109 18.000 0.004 0.0080 1.7034 0.1396 0.0024 l.4809 0.0079 0.0025 0.3 1 OJ 110 I 18.167 0.004 0.0080 l.7114 0.1420 0.0024 14887 0.0079 0.0025 0.3 0.3 II! , 18.333 0.004 0.0080 1.7194 0.1444 0.0024 1.4966 0.0079 0.0025 0.3 0.3 112 18.500 0.004 0.0080 1.7273 0.1469 0.0025 l.5045 0.0079 0.0025 0.3 03 113 18.66"''-t--oc'.:C-004~----,f-C.:o.'icoo:C:sc'o._+---'' ~7c:-Js~,._-+----:'-"'..;•'ecl:--+_co·ccoo:C2"'s_+---c'1.s"',~2cc1_+--"oc;.oo:;;.,•:--+-o:c.-"oo:C:2"',._+-_o:c.c-J --+---:-0.~J-,--1 114 18.833 0.004 0.0080 1.7432 0.1518 0.0025 t.5202 0.0079 0.0025 0.3 0.3 115 19.000 0.004 0.0080 1.7512 0.1543 0.0025 l..5281 0.0079 0.0026 0.3 0.3 Construction Runoff-lOYR.XLS 10/4/2006 3,41 PM _(_( ) __ '--cc(~2),_--t--cc'-(~3),_--t-~( 4,_J _-4-_ __c(5,_)~--l--cc(6")=~+-'~'-c(7'-,)-+~~(cc8oc) ='°'=cc-'(9c")~--t-C:("l"OJ,_-+~c'('-l l,_)_+_~("-'12) __ Ti~ i Time Prenp. lncre Accumul. PERVIOUS AREA IMPERVIOUS AREA Tot.ii lnsiam Design Increment I (nrs.) Distnb Rainfall I Rainfall Accurn ! lncre. Accum. lncre. Runoff Flowrnte Flowr,llf - --------'-----1--'~''~"=·'='o=oL) -+--(~,oc=h'"''-'--+'-"(in=c=h="'-'-+--;"="'i"o=f'cf--",--'cR"u':'110"ffc--+-"7R=""i'o=ff~1---;R.cuc;occoffcc._+--"(inccches) (ds) __ tti~·~---- (inches) (inches) (inches) , (inches) 19.167 o 004 1 _ <?:QO~O ---''-'-'-"='~''---+-+o~.1=''=''--+----'-o.'-00=2='-+--1'-.s=i=s~'-L' -+o=.00='''--+----'-o.=00=2=''--+--o=·='--+--+o.='-----J 1··Lm --1 o QO_±_ __ +-_ 9:0!800,_+--+'~'=' 1_1,_-+~o=.1=5_04,_-+----'-o~.oo=2=5-+--1=s•=1=s-_,_1 -+o=.00=19,_-+-+o=.oo='=''--+-=o.=.1---+_-+o~.1 __ _ !9.-500--·.l u 0 _ 0_00 00 _ 4 4 ___ r _0 0 :_00 00 _ 8 8 0 0 l.775 l 0. 1619 0.0026 1.5517 0.0079 0.0026 0.3 O.J ·1·9-6-(/f-I 1.7830 0.1645 0.0026 1.5595 0.0079 0.0026 0.3 0.3 120 ---' i 9 833 -o.004 o "oo·=,=o--+-----'-,L,0"1~0--+-+o~. ,=,,=,--+-----'-o'-oo=,=,-+--,'-_,=,L,=•-1--=o=.oo=,=9'---+-_._o_=oo~,~",_--1:--0~.=1--+-~,.~,--·- -T21 .. i -iOOOO -o.004-To-"oo""so~-+-(,__,=9=90~--+-oc_=1,,_9=,-+--ocoo=26~-+----'-,=_,~,,-1-+--o=.~oo,_1--'9-+--'o~.oo=,~,-+---+o-'.1'---1---,~_,~-_, 119 122 20.167 0.004 oooso 1.so69 0.1123 0.0026 1.5832 0.0019 0.0021 0.3 o·.3---1-~,=,1~-f---C2'-0_7J=,,~+-----'-07_0fl4~-+,~oc.oo=,o'---+-,~.,=,=,~,-+--o,__~11=•=,-+-co-.ooe--C26'---+-~,~-'~'-10~+--oc.oo=,=,-+i~O~.oo=,~,-1---+o=.,--·-· ·-6':3-- 124 I 20 500 0.004 0 0080 1.8228 0. l 776 0.0027 1 1.5989 0.0079 l 0.0027 03-·---~-- 0-~,~,,~--i1--2.j.o-,,~,~+-~o-oo-4~-+~o-.oo=,o~-+--i,C.8-i)L08'----+-0C.,_18_D.j.J_+--_, __ 00=21~-i,-~,_,.-,,:06:C8;~ji=-~o."'00"1"9'---il--'O"'.o"'o,.2.,1_+-__.0"J,__+--"-O."-J----+ 1--~,7,,~--+1--207.78~JJ~+-~o.-004~-+---o-.oo-'--'-so--i-+-1c.s=1788,_--+-oc-. -"-,~,-.l+---o-.00=21~-+--1.6147 o.0079 0.0021 OJ DJ 1--~,~,,~--+l-7 2~1.7000~-+-70.70704~-+~o-.oo7c-80--i-+~,c_8-4761~--+~0~.-18-5~6 -::.+--.-0--:00~21c---il _ _c_L"'6;:22cc5_+-_.0".00""'1"9-+--_.,0c,00c;c28,_+--"0".l'---l---'0".3'----I 12s I 21.101 0.004_ __ --+---_2/)()80 1.854 7 ~---"0~1"88"--,,_·_f-"o.-'oo::C:2.,1~+--'"·'"3"'04C:---+--"o-'oo""-19,_+~0"00"2;:s,_+-_o:c.~'--+--"o~.J--l f--~1~,,~--+1--,~,.-,~JJ~+ 1 - 70.=00C1___2_:0080 1.86}_~---__ o,_1,c.;1~1-+-_.o--:ooc:c21,_+__.1".,"-J8"J'--+-•"'-00""'1"9-+-_.o".oo""'2"-s-+----"o".J'--f---'o".1,_--1 --,.-,o~-"-72-1.7500~-+, -0°.=004 i 0.0080 I 1.8706 0.1938 0 0027 1 6462 0 0079 0.0028 0.3 0.3 -T:'11-· +---,-,-.,-671~--u-.0°04 ~,-o.ooso-1--~786-.. ~6"-+---o--oo",~,~+---,"65"°•"1-+--'o"oo"'-","-,-+--"o"oo""zs'--+-"o~,--!---"o".1'----t 11--, --,I BB I O.D04 0.0080 1.8865 0.1994 0.0028 I 6619 00079 0.0028 0.3 0.3 ·· 1J; 22:000 o.D04 o.ooso 1.8945-0.2022 -+~0"'00"2~,-+--,'-_,'",",~,-+--::o-'.oo""-19'--+-"-o."00"2;:,'--+-o".""1--+--"o".1--l - 134 22.161 0.004 0.0080 1.9024 _o~·c;'°;,,~•---+-o;c.oo;-;zs"--+__.1".6"1'c11,_+--"0"00"'1",'--+-•oc·;:00"2",-+-__.o".J'--_+-_"o.~,_---+ 135 22.333 0.004 0.0080 l.9l6;r--0.2078 0.0028 1.6856 0.0079 0.0029 0.3 0.3 136 22.500 0.004 ---i--0_0080 t.9184 0.2106 0.0028 J.6935 0.0019 0.0029 o.3 0.1 137 22.667 0-.004··--~80 l.9263 0.2135 0.0029 J.7014 0.0079 0.0029 0.3 0.3 ·~--rn--·-· 22.833 0.004 0.0080 1.9343 0.2161 0.0029 1.7092 0.0019 0.0029 o.3 , o.3 ~=--+--c"'c~-!--;-'cc'-:-+--c'~"--+-""-=-+~~"---!-::CC=-+-~="-+~~~-!-::CC~-+---c,C:----=---4 f---:-'~]9~-+--::2':'J.c-OOO~-+-:C"·-c"",,.';--+---;0-::.00"8"'0'--+~'"·94~22,_--+__.o".2"1~92=---+---;oc;.OOCC2CC9C--+---:-'-cc7'"11~1~+--:0;c.00~7~9-+---::'c;·"'~":--"=·.cl_--+ _ __-0~]-----l f----:-''°-:'---+---;'':'J.""16:c'~+--•:c·.:;oo:,.,~-+---;o-::.oo;c,:c•'-+~'"·'"'"02"---+--coc'.2"2"°2""1 _+--::o'o.oocc2:C0,~+--:-'-'°'25~0~+--'"~-00=1-'-,-+-~o~.oo=Jo~· --'----'-o".1---1_~o~J,___, 141 1 23.333 0.004 o.ooso J.9582 0.2250 0.00_020~---..-~1"1-'-32=9-+-_.o".oo='~'-+-~o~.OO=JO=---+-~o=.J,__,_~o"J,___, !42 23.500 0.004 O.D080 1.9661 0.2280 +-'=·=oo='~'-4-~'~''-'°='=---+--"0."00~1~9,_-+-_D=--'-()f)"J"O _ _,__--io"-.]'--1----'-0.-'-J-----l --;'""'-';-~--::'c-'·cc""'~+---:-o.-::0"04~-+--c:o-::.oo"",o'--+--c'-:·'"''cc•"1 -+-:',"·_;_",3o3o9 __ -1-0.0029 1.14&1 0.0019 0.0030 o.4 o.J ,.,. -~'='=·'~'~'--+-="~-oo'-'-'-+--o".o=o"s'-o-+1-~1.,9~8~~,-~==-~-"=00=10,__-+-+'=·'='-'-''~-'--_._o.-'-00~1~•-+_.o".oo='-'-"-+-~o,_.4,__1--_o".-'-'--4 ]~~ 24.00J 0.004 I 0.0080 i J.9900 0.2368 0.0030 1.7644 0.0079 0.0030 0.4 0.3 Construction Runoff-lOYR XLS 10/4/2006 3:41 PM Santa Barbara Urban Hydrograph (SBUH) Analysis Pre-Construction Condition Based on 10-Year, 24-Hour Storm Seahawks Headquarters and Training Facility SBUH Hydrograph • EXISTING CONDITION (10-YR, 24-HR RAINFALL) -----fuea = 19.37 acres I ' ___ ~-P1 -2.9 irx.:hes (Tola I r;unfoll for a 24-hour storm event) la----di = 10 min Tc = 51 min. (Developed site conditions) I Time to oe.ik (hrs.)= I Max Q (cfs) = I Vol (i.:u-fl) = i 0.14 1.2) 53.503.80 : :~~: 1 Vl~~JS Parc~~.07 aCfes _ --4 !~;r~~V~OiU~S~PM="=l~l.~,+"-,-"---t-----+----+----+-----·--+- ~J-----·---1--\~·" __ :f-: 4 ;~ j --~r -c; :t---0-i;~~c+-----+-----~--· ~.::.::.::.::.-_,'"·~-~--·-~= -=t=· ... - 1-------.;.0·='='-=-l-------~~-----I_ 02S __ _:: --6.04 ---~;· -----1 ~:;:: ~:: ::::,•oc•:· ..... ~-0-089~ f · -~~l -... -~= -_ r---= ~ffill_i.>J = Incremental Prcc1p11auo_n Fr~ction ____ ··-----1 ---~ ····---+-----+-----+------+--------------+------] ~mC4J=ColmM(.1)•1', -·-.L ··---~···-_ --+-·----+'---+-----+----1---··----~----- Column;.5) = A,.;rnmula1cd sum ofCol~m~l ____ ~l____ -·-~----+-----~---~----+-----+--------~-_____ _ Column (6) = !f(P < 0.2S) = 0. lf(P > 0.2SJ = (Colunm (5)-0.2S)"lt(Column (5) + 0.8S). where the PERVIOUS AREAS value is used ~(7);;; Column (6) of the present step· Colunui (6) of the prev~)=°"='~'~"~o ___ )~----+----+-----t------+---->----__ ~ Column (8) = Sam: as Column (6) except use LMPERVJOUS AREAS value r ---+-----+-----+------,I--· ·-----+------1 Column {9) = Colurnn_i!l"_?__!__!.~_p_&sent steP ~ COiumn {8) oft~ pfeviOus stfp ··--_--1.....__ 1 --·-+-----t-----.J Column { !0) = (PERVJOUS AREA/TOTAL AREA)*Column (7)+(1MPERVIOUS AREAfTOTAL AREA)*Column (9) ~li) (t"i) ,;_(60:S•c01Uffin (JO)•Tornl Area)ldt. where dt = JO or60 rninu1es I i r·----~>---_._-_·::.~=---+----+-------1 £_o_~~~ _( l 2) = Column ( 12) of previous time step + w * {(Column ( I J) of previous time step+ Colunm ( I l) of present tin:e step) --+-----+-----1-----.J ---~-----1--{2 • Column (12) ofprevlous time step)] where w = routing constant= dU(2Tc + dt) = 0.0641 ~-~-(i2-.:J ,--a;·-{)) (4) (5) (6) : (7) ---(~-1------~-=-·-{-10_)_+-_(_))_)-+---()-2)---1 Tin'K: ~-Time +. Precip lncre Accumul. PER\o'._l.s_)US AREA I IMPERVIOUS AREA Total~-+~l,0n=st~"~"'~+~°"='~'""~-1 lm:ren~nt (~rs__) Dimib Rainfall Rainfall Accum ----fnCre. I AccLJm. Incre. Rowrnte Rowrate --{fraction) (inches) (inches) Runoff ___ -~(lff··-~unoff--~.~,.~o~ff~+~=c~-,-~(~cf~,~) ~+~~(-cf~,,=-1 (inches) (inches) --{Inches)--~-(Inches) --- ' Runoff Q_nches) I -+ 0.000 ------0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 00000 2 0.167 0.004 0.0116 0.0116 0.0000 0.0000 0.0000 0.0000 0.0000 3 ' 0.3)3 0.004 0.0116 0.0232 0.0000 0.0000 0.0000 0.0000 0.0000 ~ ' 0.500 0.004 0.0116 0.0348 0.0000 0.0000 0,0000 0,0000 0.0000 5 ' 0.667 0.()(H)J 0.0001 0.00(3 0.0012 0.0036 0.0022 0.0067 0.0031 0.0000 0.0001 0.0001 0.0002 0.004 0.0116 0.0464 0.0000 0.0000 0.0 0.0 f---~---+-~=-+-=~--------,'ico~-+-ic~cic-t-T.~~--+-~~~+--::-,;:~-t-"OC~c'--1--0:7--+---::7--I 6 ± o.833 0.004 0.0116 o.058o .;.o~.0000=~-+-~=~--+-==-1-==~-+-~=~-+--o=·=o--+_~o . .;.o_---1 ---=~T : : i -::~ ·-~:: ~:~: :~ ~-~;f---·~~,::~,~-+~==--1-==-+-~=~-+~=~--1-~~:~~--+-~~~:~--- 0.0000 0.0000 0.0000 0.0106 0.0039 0.0151 0.0046 0.0202 0.005l 0.0274 0.0071 0.0352 0.0078 0.0436 0.0084 0.0526 0.0090 0.0003 0.0003 0.0003 0.0005 I 0.0005 0.0006 0.0006 ,..._~'--'l---l~'~'.;.'-+-~o.~ooc,~-+~o~.o~,~"~+-~o~.o~,~''~-+~o~.0000--~----+-"= ~+~==--1--==-+-~=~-+--.;.o~.o---+-~o~o_·_·---1 10 1 1 500 o.004 0.0116 o 1044 0.0000 +.~-'.CC~-+-==-+.-~=~-+-~==--1-~o~.o, __ +-~oo ___ U __ _J_ ~~-~0~00~'-+~o~.0~)~16+---+-~0_)~1(,2-------+---0~ . .;.oooo=~--·-+-~=~-+-~==--+-==~-+~==-+--~O~.o __ ,___.;.oc.6 ___ _ __ 1 1 .. ' 1 _ ---,--! 833 0.005 0 1305 0.0000 -~" 0. I L-....Q_;_(f~--== 0.005 0.1450 0.0000 0.1 0.0 ·-+--~ccc~-+-c.c~-+-~~-----· -------------------0 005 0 I 595 0.0000 O. l 0.0 --~-+--~-+--~~~--+-c.c~-+-~'"-c------0 005 0.1740 0.0000 O. l 0.0 --· 2 000 ' 2 167 2333 0.0145 0 0145 0.0145 0.0145 0.0000 o.0000 0.0000 0.0000 0.0000 0.0000 0.0000 14 15 ' 0.0620 0.0094 0.o718 0.0098 0.0006 0.0007 2 500 2.667 I 0.0145 0.0145 0.0000 0,0000 16 17 ' ---l--~cc'c-+-~0.~00~5~-+-~==-1-~"~l.;.88,5~-+~"~·ooooc..c~-1-~==-+-==--1-~=+---+-~=cc..-,_-oc.1 __ __,_~o~.0~---1 o 005 o. 2030 0.0000 o.l 0,1 JR 2.833 0.006 0.0174 0.2204 0.0000 0.0841 0.0122 0.0008 0.) 0) 19 :moo 0.006 0.0174 0.2378 00000 0.0000 0.0967 0.0127 0.0009 0.) 0) 0.2:;52 0.0000 0.0000 o. 1098 0.0131 0.0009 0.) 01 0.1233 0.0\34 0.1370 0.0137 0.1510 0.0140 0.1676 0.0166 0.1846 0.0169 0.2018 0.0172 0.2192 0.0174 0.2368 0.0176 0.2546 0.0178 0.2757 0.0211 0.0009 0.0009 0.0009 0.(XH I 0.0011 0.0012 0.0012 0.00l2 0.00[2 0.0014 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.2726 0.0000 0.2900 0.0000 0.3074 0.0000 0.3277 0.0000 ~3486 0.0000 0.368J I 0.0000 0.3886 0.0000 0.4089 0.0000 0.4292 0.0000 0~4'.iJO-00000 -· 21 t 3.333 ' 0.006 0.0174 0.1 22 3.500 0.006 0.0174 0.1 ~-23---t···. J .. 667 0 .. 006 0.0174 0.1 24----18~ -oTo-:Y--r--·0.0203 0.1 ~l; --. :ffi±~~l --1·~~;~~~i-+-~==--0=~==+-===-+~==--i-~=-+-==~-+--~~::=-+-==---l -·-·23---1 -.Lsoo---·-j--6.001 · 0:0:20°.1-+-===-i===-+--==-+~==-1-~=-+-===-+-~o-1=...,-==--1 ~-~--f-_·-4.66_? _____ ~ 0.007 t-0.0203 0.1 30----r-4 833 0.0082 0.0238 0.2 01 0.1 0.1 0.1 0.1 0.1 I 0.1 0.1 0.1 0.1 0.2969 0.0213 0.0014 0.0000 0.4768 0.0000 31 : 5.000 0.0082 0.0238 0.2 0.1 0.5005 0.0000 0.0000 0.3184 0.0214 0.0014 0.2 0,] 0.5243 0,0000 0.0000 0.3400 0.0216 0.0015 0.2 0) 0.3618 0.0218 0.3836 0.0219 0.0015 0.0015 0.0000 0.0000 0.5481 0.0000 0.5719 0.0000 0.1 0.2 ,, __ ~po 0.0082 -4_Q."02"',"''-+--icc~~-+-ic~cc--+--ii~cc--+--:c'cce7"-+--:cccccc--+--:ccccc'c--+-c,oc;.2;--+---iicc--" 35 , 5.667 0.0082 I 0.0238 0.2 -0.4091 0.02."l5 0.0017 0.0000 0.5994 0,0000 36 5.833 0.0095 0.2 0.0276 0.2 )7 6.000 0.0095 0.0276 0.6270 0,0000 0.0000 0.4348 0.0256 0.0017 0.2 0.2 38 6.167 0.0095 0.0276 0.6545 0.0000 0.0000 0.4606 0.0258 0.0017 0.2 02 04865 0.0259 0.0017 0.0000 0.6821. 0.0000 0.0276 ]9 6.333 I 0.0095 0.2 0.2 0 5124 0.0260 0.538:S 0.0261 0.5755 ' 0.0369 0.6126 0.0371 0.6498 0.0372 0.70(X) 0.0502 0.0017 0.0018 0.0025 0.0025 0.0025 0.0039 0.0000 0.0000 I 0.0000 0.0000 i 0.0000 0.0005 0.7096 0.0000 0.737:2 0.0000 0.7760 0.0000 I 0.8149 0.0000 0 8538 0.0000 I 0.9060 0.0005 0.2 0.2 0.2 0.2 0.2 -- 0.3 0.0276 I 0.0276 0.0~189 ' 0.0389 ( 0.0389 I 0.0522 ! 6.500 j 0.0095 0.2 -41 6.662.____J___007.009=7'-+-==-+-===--+===-+-===--i-~==-+===-+-===-f-=07.2=-+--==--i 42 6.833 i 0.0134 0.] ~~--~, --------:rooo--,l--707.07 1~,7,-+-~·=~--+-~~ o., -4~ 1.161 0.0134 77=~-"+~==-f-==~+-~=~--+===-f-===+--~o.~3--+-~~- ~45---~r·7.33_.1_i 0.018 o.5 Pre-0 Runoff-lOYR.XLS 10/3/2006 6:10 PM {l} 1 (2) I (3) (4) I (5) {6) (7) ' (8) I (9) (10) (11) (12) f--c'T,~,,'-,----,--Tcc,'me'--. r--P~ce~d'-,, -----+--,~oc~-ce---1--A-,~,o~n-m_l_-!--,p"_cE..,Rc'V."IO"U~S,,A..,R""EA"--l'-"IMc,Pc,E:"C,R"VC'IO~U:,,S_cA"R"E"'-A Total lnstant Design locr~rnent_~ _(I!~-) -----c-~D~,,=n~,b'--+---'R=;11=,r=,-11--+--'=R=ai=,fccc,=II!-~ ·Accu,rn."'-+--"'"'="=· -l-'-A .. cc,:·o"'rn.._+-''""''c""~--+--'R="="='=ff-!-=Fl=ow==rn="-,--'-Fl_o_w_rn_ie--l ___ -_-_ 1 1 !-1=fr=.ic=''=""='--1-I --''='"='="'=',_) -+J--~'=inc"~~-___ _,R'"""'"'"'ff'-+--"R'"w,"'o"'ft_---l---'""'"CO"C'o( .. f_l-C'R'"o'"1m"'ff, __ __,--'={in=c=h="=)-1--(~cf='=) -+---=''-''=) _ __, ---j '. 1 (mches) , (inches) (inches) (inches) >-~4~'--1--',--'-oo---+--__ o:-c·-:c' '~''--+-'o"'o"s2,_.2'-+--"""-•c.""'''----1----::oc;.oo.-;2;,,,_+_ o.oo Is o 7 so4 o.us04 o.oo~o:-+-o=-"•---1-----::0=-'----j 47 I 7.667 -+ 0.034 0.0986 1.0568 0.0089 ;'--OO;-c66:;...--1--'0,_8"4"60:-+--'o".0"9~S6,_+_o;-;Ol25 1.5 0.4 48 1_333 I -"o".0~54:--+-'o'-'1","66'---+-''--:-'c:'='4~--+---:o~.0~2c;'"-'-+--~o.01ss o 9987 o.1s21 o.027·s"--+-~,c;,--J---'o'c_,:-----j 49 3.066 -1----'o".Oc-2;,-l _+--'o,_u","'"'--r~'"'-'"'"'-'-'-+-Oc.0"4-;00 -l--"':","""'-+-~'cc-D:c'cc'4_._+_.o".0~76,c7c___l -o.OJ7o 2.0 LI --~..l-8.167 0.018 00522 , 1.3419 0.0496'--H-0096 1.l266 0.0512 -0.0124 l.5 l.2 s1 s 33:1 +-"0"0"1Jc,,-'-··-'-o'-',"n=s"-•-1--1--'1"'_1~,:--,",--ll--'oc._o~,.,,,"-, _cco~.oo","''--+-'-' ,c'64='-+---'o-'-.o","";.-+·--o.009'~;'::::!::::::"1-'-2t::::::t::::::fLf2::::::~ ·--~---;--ssoo 00134 0.0389 1.421u 0.0657 o.oosJ 1.2030 o.0Js2 ifOIOJ 1.2 1.2 --53---r--,","',~,-+1--'o'--0"1"1-'-,-+-~o".o','J'C89:---'--',-'-_4=,;o-,"--f-o:c.0"7"'44-'--+---","_oo~,,'-+---'-,'c24"1"2-+--'-o".038i----,f--70.c:0"'10"7:-+-",",---l----',"_2'-----j ~ 1 s 833 i o.ooss 0.02.ss r 1.4860___ o.osos 0.0060 t.2663 o.025",'-+---'oc'-_oo=,cc,-+---'o'c_9:--f--,"_2"-----I -55 -+-i-'-97000Cc..-l,,-"o"oo"sC:,----:o"_o::c,~,",-~_ -'(S l IS o.0867 0.0062 1.2915 o.02oc51f--+-o"."oo"',~,--+---'o"'.9"---+----'-L~1--i ~-~ su i 9 1u1 1 o.ooss I o.02ss -;-1:5370 0.0931 0.0064 1.Jt66 __ o".""'"'cc'-+--"occ.oo=,"'-+----::oc;.9 _ __,_~':--·:--' ___ - 57 -l+-~9:--'"'"''-+l--'":--.1:c"':--';:-'-;-' _.oc:.o:c'"":----'il--J_-_s",2",:--+--'-""-0"99"'-+-""-"00"6"'--t--':--Jcc4'ccl8:-+-o.02s2 0.0019 o.9 u -·ss -__ _,_, -"'"'ooCc..----,f-"-o"oo"sc:'--'-' ---:oc..o;c2~,"'-'l-·· 1.ssso 0.1065 o.clOus 1.3669 f--·7oj.oi25~2t::!::::ot.oo~~s-io::::t::::jot.9~::::::t::::::t,~o::::~_-i -59 -1--9.667 0.0088 i 0.0255 J.6136 0.1135 0.0070 U921 0.0252 0.0082 1.0 LO 60 ; 9.SJJ o.ooss o.02ss 1.639(___ o.1w1 0.0012 1.4173 . "'o_-::02:c,cc,~-t---:oc'-_oo=,-c•-+---',"_o:--f--,"_o"------I ~-1 · ---+-I ~,°"o"oo~o--1-o'c'_"oo"s"'s-+ ,' --'o"_o:c,;;,~,-+-1 ... i .6646~+-'o.712:Cs"o-+--o".oo=,",-+---',-'-_44=25:--+ o.02s2 o.0086 1.0 1.0 .. __ _ __ ~;----!1--',o;_=,0°','---t--'o~oo=SR"----'---'-oC::_o.;25~5,_+,1 __ --'1"_6"90='-+---'o'-.1"3"56'----'---'o".oo","''--+---'-'"""'-'-'-f--'-oC:.0"2,"2:-+~o:c.oo='cc'-+--~'cc-Dc___+-_~1.o ___ _ _ _____ii3_ _ i 10.JB o.ooi;;s I o.02ss "L u1s6 0.1433 0.0011 t.4929 -:c"·-:co2",cc2_+----:o:'coo='-;-9-+---''"-o'-__,f---'c-·o:;----1 _ ___ _ ~±______J-"' o".s"oo"'--_,__.oc;. oo.-;':c':-+-o:c·;o2;,,;;s __ j -:,'"'74~,-c,-+-:co_715,:c1'c,-+--'-o"'oo=,;,-9 -+---',~_,c-, :C"f--~:1-_ -:c"·-::0"2,"2:--t---:oc-. oo=9cc'-+----'''--':--1--"Lo:----1 _ 0s -+i--"'""-6"6"'-t-' _.oc;.oo.-;s::c':--''-o:c_"o2"s"s_ .. --'"'"'"'-'-'-+-"~--'-"'-'•='-+---'o-'-oo=''-' _1-.c'=-'-"43'-'~ +-"c--0::02"5-o'2-1--::o--:.00=92"--+--::'-::·'--1----1~9 ___ _ 00 '-='o,0.,"'1"'-+-70-::.oo-::'cc':-+--oic_~o2"0:'c-9 1.7876 0.1660 0.0061 1.s64o -+---:o,,.0~2:co:c•-1-70-::00=":c---+-cco.-::9--+-----:',-:o--~ _ 0 6 ·, 3 ---1 l J.000 j 0.0072 I 0.0209 l.8084 0.1728 0.0068 1.5847 0.0207 0.0078 0.9 1.0 11.167 o.oon 0:0209 1.sz93 0.119s 0.0010 1.60~;"3-+----:o:'c_o~2"0;,-,-f--::o-::_oo"',"'9:C---+--::o_-::9-LO 69 11.333 0.0012 0.0209 1-sso2 o.1s6s 0.0011 -+---:'--:-•'"260~__,--::o.-::02:cocc,_-t---:oc'-.oo=soci---+----:"cc·9~-+--i'Loc-_--l 70 l 1.500 0.0072 0.0209 l.8711 0.1940 0.0072 1.6467 0.0207 0.0081 0.9 1.0 71 li.667 0.0072 0.0209 1.8920 0.2013 0.0073 i.6673 0.0207 0.0082 1.0 1.0 72 11.833 0.0072 0.0209 1.9128 0.2087 0.0074 l.6880 0.0207 0.0083 1.0 l.O f-~,cc,--t--i2.000--+-'o~.oo~,;,-1-c:oc;_o~2;co9:'--+-',c;_9~3c'.'37~-+--:-,~_,~,"'0;.,-1-~0C::_oo~,~,:-+-+,~,o"s"1-+---;0';_022~0,:'--+---:;oc;:_oo","•;-+-~,.~o--+---:-,c,o;----J 74 ]2~"" .. ;'16~7-l-.;0';.00~72,---+---:;0-,;:0-':'20S9c--J--''-~9~54;;6'--+---:;0c;-';:-,2l:;c7c_+-O;:c-;::00~7~6-+----:'cc·7,,2',,94,---+---:;0c;-0;20~7c_-J--O:C::.00~85~-+---"L~O--+---'I=-O---< f-~,~,--1-_:,1~2-:;:JJ~J'--+--.;0';00~12;---1-----:;oc;:-D;20:;•:-+--:-'~-•;'c;c";---+---:;"c;-'"'~'·:-+---:;o-;oo~,~'-+-+u;cs:,:0"'1_1-.;o:c;-•~2;;0';-+---:;o-"oo"s~•:-+-,cLfo---+---:-L"o_----l 1--~,cc-6--+-12.500 00072 0.0209 1.9964 0.2392 0.0078 1.7707 0.0207 0.0087 LO LO ~--_-+-----'-12~.6~6~'-1-~o~oo~'~'~+--o~-=02~0~•-+--~'-~"~"-~2 ----l---"0."'24='c7"1_+-'-o"'oo='-'-'--l----''-"'"9-"14:_--1--_::_0 . .,,o.,,2occ7 0.0088 1.0 1.0 ~---12 813 o.OOj7 o.o 16j 2.03.,8 '--'-'"'2.,,,_,,,,,_,_+---'o"oo='''-+-'' "'-s"-0,",'--+-'-'""·o 164--f-o-oo=,"'o-+--o~.,'--1---,~o---f ~f ---+-----'-1J~ooo~-~-+~o~.00~57--+-~o.~o~, ,=,-+--~,_=o.sos --·-t 0:2598 0:0064 1.8242 o.0164--+--o=•~oo=,=,-+--o'-_=,---+-~o_~.---f --so 13.167 ' 0.0057 I 0.0165 I ··-·2.066'.,-"'08_+-'-""-'°''"''"'--1---'0"00=64:_+-'L"'840~6'---I. __ co~o=''~'~+-~0=00=771-+---'0--8~->--'--~'----1 --_ 81 13.333 !, Q.0057 : 0.0165 '"j 2.0834 0.2728 0.0065 1.8570 0.0164 0.0072 0.8 0.9 82 13.500 0.0057 0.0165 2.099() 0.2794 0.0066 1.8734 0.0164 0.0072 0.8 0.9 ---~83~. -~-~ll-.6~6~7-f-l ~0~.00~5~7~--+--()~()]65 2.1164 0.2860 0.0066 1.889-8°-+-~0~.0~1=64~-+--~0.7007 7~3-+--0~.~,---+--0-.9~---l 1---~,~4--r--,~,_~,,~,~+----0;00°',"'~+-~oc..Do_l,_,6"'-+--~'="-'-'"'o_+_o:-c-~''"2"'-+--'o".oo=•':-+ _,1".906""2._--l---"o."'0"164"----l--'o".oo~,"'-+---'o'-_9;_-_--_-;__-_-_-_~o:c.~,---_-_-:: 85 14.000 O~oo:c',cc'-+---'o"'.0"1"'6"'-+-~'"-"' ':.:•c:'-+-':-c·'~'"'='•-+---'o".006=':----1---''~-,~22,,,,_+--"o.,,_0"164"---l---'o-'-. oo='.c•-1--;occ-9'---1-'--'"~-•:-----j >-~,~"--r-~,~,_-10-~,~--... "0.0051 0.0165 2.1660 o.3062 o.oo6B 1,9390 0.0164 0.0014 o.9 o.9 8/ I ]4.33j 00057 0.0]65 2.(825 0.313] 0.0069 1.9554 0.0J64 0.0075 0.9 Q.9 >-~,~,--1--,-,_~,oo~:_"::+-_o"..oo""',='-+--'o".0"1,,_65'---+--''"-'"99~1 -+--'o-'-.J~200""'--+---'o.0069 l.9718 0.0164 0.0016 o.9 o. 9 89 14.667 0.0057 0.0165 2.2156 0.3270 6.0070 l.9882 0.0164 0.0076 0.9 0.9 90 14.833 o.oos 0.0145 I 2.2301 o.3331 o.0062 2.0026 0.0144 o.0067 o.8 o.9 >-~,~,--1-~,~,_~ooo~---+---~o.oos 0.0145 2.Z446 o.3393 0.0062 2.0110 0.0144 o.0068 o.8 o.9 92 i's:i"67 0.005 0.0145 2.2591 0.3456 0.0062 2.0314 0.0144 0.0068 0.8 0.8 f-~97,--j--~,~,_-t"l,~)0 0.005 i 0.0145 2.2736 0.3519 0.0063 2.0458 0.0144 0.0068 0.8 0.8 94 -I-15.500 0.005 I 0.0145 2.2881 0.3582 0.0063 2.0602 0.0144 0.0069 0.8 0.8 95 +-''-"'-"'':c,''--+----"o."oo~,:--+-'~o_..0"1"'45:--'c---'2_..,~0"26'----+--''c'c-'64<i-""-+-70-'oo~64'----l-''c'-:c,o,c:•.-;6_+--_.o".o"1"44'---+-:Co_c,-:006=9-'-+-o~-"'---1-----::o-'.s----j ~~ • i 15.833 0.005 1 0.0145 2.3111 ___ +-':c·"'''~'c"o-+--'oC:oo'-'c64:-+---::2_..o-::s90:c----1-o:-c.;.•'cc44:,c.---1-----:o:c.006'-'c9"--+--'"c,·''------,----:o:'c.8c----4 -97 I l6.000 0.005 j 0.0145 2.3316-. 0.3774 0.0065 2.J034 0.QJ44 0.0070 0.8 0.8 c-----:'cc'----1--'"=·,c"cc'-+---o"."oo~s~~'~70-'.o-'-1,';sc __ ,_--:2"'_J:cc'"~'-+-':c·c::""'-=9--t---:0~00=6':---+---::''c-'cc""'f--+--o"_':-01:-c":,c.--+----:o:c.oo='oc-+--'oc;.s'------,----:"c:·'c-·---- 99 16.333 0.005 0.0145 2.3606 0.3905 0.0065 2.1322 0.0144 0.0071 0.8 0.8 f----",oo=-+--',6"'."',oo~--+-o:C_ocoo~,~+-'-o-'_0"'145-+---,c'_C::37~,"',-+-:c,_739","o-+-"o"'_oo=,",-+---',c:_,'c,6o"6:-+-'-o_-::oc-144cccc--1----:oc'-_oo=,c-,-+-----:oc:_,:--f-~o".,"-----I 101 16.667 o.oos 0.014.s 2.3896 o.4036 0.0066 2.1610 0.0144 0.0011 o.8 o.s 102c---,-~'~'-~'';;';-+---o;,-"oo:::4;-+---:;oc;:-o~,~'';-+-;:'c;'°~";---+~':,:-4090~;-+---:;o-;oo:c',,''-+--:2:;c-;;":.;27s_1-.;o:c;-•~1.;c";-+-o"."oo","'.-+-o:c-""'---+----:;o-"s_----1 103 11.000 0.004 0.0116 2.412,,_s_+-'-'"-'"'"4.,_J_-1--_,o,..oo="'---+-'-2."-18"'"'~+---'o".o'","'"'-l--"o_..oo~ss,_+--"o".,_-1 _ _,o".s,_--1 104 17.167 0.004 0.0116 2.4244 0.4l97 0.0054 2.1956 0.0115 0.0058 0.7 0.8 105 17.333 0.004 0.0116 2.4360 0.4251 0.0054 2.2071 0.0115 0.0058 0.7 0.8 106 11.500 0.004 0.01 .,16,__l-_,_2.,:-44="7"6'----l---'o"'.,"JO"s,_+_O:c-,:OOe,5::4_+--''cc-';;'-':'"'--+-"o"_o,.1"15,_+_o"'."oo"',"''--+--'o".,'---+--"'-c;'---i l--'IO,clc__----!'--'-""-'"66c;7_+--_0,c--':'004;:.._f---':'0".0-'-1 "16,_+-"2c:,-4,c59c"2._--l---'Oc:-'o:lcc59,_+--"-0.,-,00,c5::4c__+--'-2:CC.2"°302 0.0 I 15 0.0059 0.7 0. 7 f--"10"''-~--'""-''"'-;'-+--'-";,-oo;;c,'--+-:Co.,.,o,_1.,10,_+--"'"'"'o"',,_-l----"o"."='4'-+-o"."::oo"',:,;'-+--''~-24~1~,~-_:_+l---~-"o~-D~l~l5~::4'::::7 o:cc_-oo;,:•::::1::::-::;c,o- 7 7-::-:::::::·~::~o~.'=,::::::::; ]09 18.000 0.004 0.0116 2.4824 0.4469 0.0055 2.2532 0.0115 0.0059 0.7 0.7 110 18.167 0.004 0.0116 2.4940 0.4524 0.0055 2.2648 0.0115 0.0059 0.7 0.7 1-~" 7 ' ~----'' "'-~''"''--+---o"_"ooc-,'--+-'o".o'-1 "1 •'-+---::'-'-'~o,~0:---1-----:occ-4"5,:.79:-+-:co.-'-oo:c's",_+-~';c':c,'c::6,:-3 _+-~o".o"-'11;,_.1-----:o:coo'-'c,cc9_+-_.oc;. , _ __,_---:occ_ ':c------1 JI! , 18.500 0.004 0.0116 2.5172 0.4635 0.0056 2.2878 1 0.0115 0.0060 0.7 0.7 JJ3 I 18667 0.004 0.0116 2.5288 0.4691 0.0056 I 2.2994 0.0115 0.0060 0.7 0.7 114 I 18.833 0.004 0.0116 2.5404 0.4747 0.0056 2.3109 0.0115 0.0060 0.7 0.7 1!5 19.000 0.004 0.0116 2.5520 0.4803 0.0056 , 2.3224 0.0115 0.0060 0.7 0.7 Pre-D Runoff-10YR.XLS 10/3/2006 6:10 PM ii) ; (2) (3) (4) (5) (6) I (7) (8) I (9) (10) (11) (l~J Tim!---- Precio IMPERVIOUS.AREA ·--- Time -t-Jncn: Accumul PERVIOUS AREA Total Instant ' ~sign ~~:~~-Ill .L -Rainfall" ,c (hrs.) Distrib R,iinfo!I Accum lncre. Accum. (ncre. Runoff Flowratc I Flowrnte (fraction) (~_c~-~s).,. Runoff Runoff Runoff Runoff (cfs) -·-·---=------- (mches) (ioches) (cfs) (inches) (inches) (iiiches) (inches) -- 116 19.167 0.004 I 0.0116 2.5636 0.4860 0.0057 2.3340 0.0115 00060 0_7 0.7 ~-- 117 19.333 0 004 0.Ul 16 2.5752 0.4916 0.0057 2.3455 0.0115 0.0061 0.7 0.7 -----"-19.500 0.004 0.0116 2.5868 0.497] 0.0057 2.3570 0.7 118 " 0.0115 0.0061 0.7 ---- 19.667 0004 0.0116 i5984 2.3686 6."i 119 i 0.5031 0.0057 0.0115 0.0061 0.7 -120 19 833 0.004 0.0116 ---2.6100 0.5088 0.0057 --2.3801 0.0115 0.0061 0.7 0.7 -121 -~ 20.000 0.004 0.0116 2.6216 0.5146 0.0058 2.3917 0.0115 0.0062 0.7 ' 0.7 ---122 I 20. 167 0.004 0.0[ 16 2.6332 0.5204 0.0058 2.4032 0.0115 0.0062 0.7 0.7 123~ 20.333 0.004 0.0 I fir-2.6448 0.5262 0.0058 2.4147 0.0115 0.0062 0_7 0.7 124 20 500 0.004 -b~Of 16 2.6564 0.5320 0.0058 2.4263 0.0115 0.0062 0.7 0.7 125 2.0.667 0.004 ---o:·0-116 2.6680 0.5379 0.0059 2.4378 0.0115 0.0062 0.7 0.7 126 '.:0.833 0.004 : _ __ O.Dl 16 2.67% 0.5438 0.0059 2.4494 0.0115 0.0063 0.7 0.7 127 21.000 0.004 0.0116 2.6912 0.5497 0.0059 2.4609 0.0115 0.0063 0.7 0.7 ----- 128 21. 167 0.004 0 OJ 16 2.7028 0.5556 0.0059 2.4724 0.0115 0.0063 0.7 0.7 129 21 fij 0.004 0 0116 2.7144 0.5615 0.0059 2.4840 0.0115 0.0063 0.7 0.7 ·----OJ)l 16 2.7260 2.4955 130 ~--21 500 0.004 0 5675 0.0060 0.0115 0.0063 0.7 0_7 ----------:--,-·--- 131 21 667 0004 0.0116 2.7376 0.5735 ooow 2.5071 0.0115 0.0064 0.7 0.7 ---- 2.7492 132 21.833 0004 0.0116 0.5795 0.0060 2.5186 0.0115 0.0064 0.7 0.7 ~- i7608 i.530l ~133 22.000 0.004 0.0116 0.5S55 o.oow 0.0115 0.0064 o_, 0.7 134 i 22 167 0.004 0.0116 2.7724 0.5916 o.oow 2.5417 0.0115 0.0064 o_, 0.7 ------- !35 22 3}3 0.004 0.0116 2.7840 0.5976 0.0061 2.5532 0.0115 0.0064 0.8 0.7 ~- ---~~6 _ _)_ 22.500 0.004 0.0116 2.7956 0.6037 0.0061 2.5648 0.0115 0.0065 0.8 0.7 137 22.667 0.004 0.0116 - 2.8072 0.6098 0.0061 2.5763 0.0115 0.0065 0_8 0.7 138 22 833 0.004 0.0116 2.8188 0.6160 0.0061 2.5879 0.0115 0.0065 o_8 0.7 - 1]9 23 000 0.004 0.0116 2.8304 0.6221 0.0062 2.5994 0.0115 0.0065 o_8 0.8 140 23.167 0.004 0.0116 2.8420 0.6283 0.0062 2.6110 0.0115 0.0065 o_, 0.8 141 23.333 0-004 0.0116 2.8536 0.6345 0.0062 2.6225 0.0115 0.0066 0.8 08 142 23.500 0.004 o.oi"Ju 2.8652 0.6407 0.0062 2.6341 0.0115 0.0066 0.8 08 143 23.667 0.004 0·0116 2.8768 0.6469 0.0062 2.6456 0.0115 0.0066 0.8 0.8 144 23.833 0_004 0.0116 2.8884 0.6532 00063 2.6572 0.0115 0.0066 0.8 0.8 145 24.000 0.004 0.0l 16 2.9000 0.6594 0.0063 2.6687 0.0115 0.0066 0.8 0.8 Pre-D Runoff-lOYR.XLS 10/3/2006 6:10 PM Santa Barbara Urban Hydrograph (SBUH) Analysis During-Construction Condition Based on 10-Year, 24-Hour Storm Seahawks Headquarters and Training Facility SBUH Hydrograph • DURING CONSTRUCTION CONDITION (10-YR, 24-HR RAINFALL,_) ----l------1------"-~~-,--+-~=---! r------___; Area -j l9.37 l;icn:~ __ :[-[ [ __ L __ -__ : Timctopeak(hrs.)+ 0.14 : Pt --=I 29 !inches (Total r.iinfall for a 24-hour storm event) _;M~"~'~Q~(~c~fs~)~-+~;0;·~9~1 cc----l -· 1 dt -10 min · ·1 I Vol (cu-ft) -45,590.14:_ _ ____ , __ Tc_ c::I 51 lmin: (6e\,-e1~pectsiteconditio11sl , -·-------•--iER\nous Parcel , . IMPERVIOUS Parcel ---------,-----i-----1------- 1------i Are;i cc J9.I71acl"es I Area -·· 0.2 aCie-,----+-----"-----+ 1----I ---·(:,,.: "' 70 ( ! CN -" ., 98 -_-_---< -~ S cc 4.29 i I 5 -0.~20~+------+----+-----+-----ie--------1--··- 0.2S "' o:ifo" 1-I 0.2S -.oc:,o,~•+-----+-----+-------i-----' ':---- --~:- 1 , 0.0893 I --e----------1------+-------i ~- ----.L ~Cl_!_i:mn _l l_L'=' TirTll:' Jncrernent , i -----1------1----- Column t~) = T1n11:: (rnm) , : --+ ,.---------I 1 Co\U-ni~,)~Tr;°~ren~n1,1I Pn:ciPiiation Fraction 1 --_ --:---------+----1-----+--------t -----------~'---------~---=--_, (·ol~mn-(--l) = Column (.1) * P, ; -·-t-·· i l ~Oi~ITln (5) = An:umulated SUI!) .Of Column (4) j --· I i --· ! Column (6) = If (P < 0.:2S) = O, Jf(P > 0.2S) -(Column (5) -0.2S)"1/(Co!umn (5) + 0.85), where !he PERVIOUS AREAS value is used C'~!~n (7) = Column (6) of the pr"esent step -Colurrm (6) of ~_pr<:VTOUs step I -l·e---------1------1-------------) Column (8) =c s,une as Column (6) except use IMPERVIOUS AREAS value I S'olu-mn (9)·= Column (8) of the J?:iesent step -Colurrm (8) of ~previous step -- Column ( 10) = (PERVIOUS AREA/fOTAL AREA)*Column (7)+(1MPERVJOUS AREAffOTAL AREA)*Co"lu,,mn""-'l,;c9),_ __ ---i----+-----+-------! ---------1 COiumn ( 11) -(60YColumn ( 10J*Total Area)ldt, where di --LO or 60 minutes I i COiumn ( 12) -Column (!2) of ~revious time step+ w ' [(Column { 11) of previous time step+ Column { 1 l) ofp~0se~,~t u~·""=~"~,p~)~---+----+------~' ------1 (2 * Column (12L~f previous time sten)] where W. __ c:.·'~ou~o~·,~g_,c~oo~,~'"""~t~-_,d"i/"-(1~1~·,~+~d~,~)~-~0~.0~64=1--+-------+----+------"-'-------i ' ---i'l)~ --_j_ -~(2~) __ ,C--_{)} __ --+---(-4-) -+--,~,-)----1--~(6°')~-=1'~--'-(7'.L)_-1-~-(sc8~) ~-1-c-_--'(9,,)c__--1--'("-I O,c)c_--J---'(°'11")· __ ,_!, _ _,(.,_11,,)_---i __ !~ --~me Precip Inc re. Accum.0u1~-__ 1 __ P,,E~R,_Y,_t"O"'l"clS"-'-A.,_R~E,_A,_-4_.t,,M.,P,,E~R~V:_l;O,,U"S~A=R~E,,A.___+---,,.'.T.,o::_"~t ~+_;-ln::_>c"·"""~I -l---;"De=si~i.:~"----1 __ lnt_r1:_~~ L---'(.,h,,,,~)-~'-'-D"'is-u~(b"---+---'R~""'"::.'"""l~l--l-'-R""'ainfa~ll-+-_A=cc_:,u,,m;--1-....'.'.loc"'ce~. ~+--_.A~c~c_:,u,,m'-----1-_.l~oc~re""c. -l--_.R_.,,"o~o,_ff.___+-,,Ft_:,o~w~,_.,,"'10.___,_,,Ft_:,o~w~r._.,,i~,-" (frnction) (inches) (inches) Runoff Runoff Runoff Runoff (inches) (cfs) (cfs} (inches) (inches) (inches) (inches) 0.000 0 0.0000 -~-f-.;O:c;OOOcccO,--+~O-;,OOOO;;c_J-;O.;OOOO::;,;.-j-;O;OOOO;,s:c._J-;O·;,OOOO:S-J-;0.;,0000~c._f---___"O',,O---+ __ O:;c.O:C-----J 2 ±0.167_-+--~o~oo~•.___-+~o~.0116 -+'-~o."0"'11:-,6:-+-:;o·c;:oooo;:;;:-+-o~.;oooo,"".,___-l---"-o"'.oooo='--l--'o".oooo""""---+--"o"'.oooo=.,___+--"o"'o_---i---"o".o'----l ~-0.333 0.004 00Y16--I 00212 0.0000 0.0000 0.0000 0.0000 0,.,0000="----l--"o"o'----i--'O,,O.,___---l ~ ~-"'-ti,.0 a5'C'o··,a:::~c:iot.oto,.4~_-_-c~--_~o ... •·.,_o,,i·1,,,6 _ _;____.,_D.,Oc:3~"'''-+--"-0 . .,0000~-+--'""--oooo"j::~~-+C~ce0':ooooo';~~-::_~'=.-::.~o;'.oooo.::j~~--+;_~~o .. ~oooo=.,___-1-_ _:,0::_.D,_---li-00 ~-; o.667 0.004 , 0.0116 0 0 .. 0464 0580 0.0000 o 0000 0 0 .. 000 0013 1 0 0 ._000 0012 1_ -l---"0 0 .,._0000 0000 =.,___+ _ _.,o"".o'-.-i-~o~.o.___ _ _, ~----1 o.833 o.004 0.0116 1 0.0000-+-~o~.oooo=-+-~~~-+~==--o.o o.o ~-~ ---~' -~1.cooo~-+--~0,.00.,_,:__-+I _.o~.o.,_1~1"'•'--le-----'o".0~6;%:;.._J_~o~-oooo,,,,°----l-o.,_ . .,oooo""''--l---"o".oo,,,,J~6-L-'0"_002.,,,.~2.___-1-_o.,_ . .,oooo=.,___-1-_..oo".o"---_-l--_.o"o"---_--l __ ~''-----~ ,. -~'-1~"'--+_,0.004 1 o.o 116 o.os1;.2_+-_,o,,.oooo,,,,"-----l----'o".oooo='-+--"-o . .,oo.,_6;-'-+--'o".oo,.,3,_1 _+---"o".oooo='-+-;co:::o_---J---"o".o.___---J 9 : \.333 0.004 I 0.0116 0.092.& 0.0000 0.0000 0.0106 0.0039 0.0000 0.0 0.0 1 o 1.500 ·0_004 o.o 116 0.1 o«'-----+---"o,,.oooo""''--+--"-o . .,oooo='-+-_.o"c.o.,_1:-,5~1_-1--.,0,,.004""'6'-+---"'o.~oooo=.___-1-_ ~o;co---+---"":::·o_--1 -__II_--~---''~'~''--+ 0.004 : 0.0116 0.1-160 0.0000 0.0000 I 0.0202 0.0051 0.0001 0.0 0.0 --+[ -'-' ---+--'-·8~.D--+ __ o.,_ . .,_oo:',._+i _.,0.,:-0_.14"5._-1+---·~0_.l,c30;5--l----"O."OOOO""''-+-o.,_ . .,_oooo,,,,_L--"'0.0274 0.007 J 0.000[ 0.0 0.0 __ 13 , 2.000 _,o".o~o.,s_+---'""·o.,_1"•,,s_+-0.1450 0.0000 0.0000 1 o.0352 0.001s 0.0001 __ _.,o.;co---+ _ _.,o".o __ _ t4 :2.161 , 1 0.005 II 0.0145 ~·.::o-:'-c:''c•s::----+-'o"oooo""''-+--"o-".0000=.___! -o:0436 o.ooiw 0.0001 1 _ _.,o.7o_--+'---"o:::.o __ 1 is 2Jif o.005 . 0.0145 ---1-_.,0-:-'-:c''°~-+---"o-".oooo""'._+__.,__0.0000: +---o.os26 o.0090 0.00~0_.1 _ _)__-'oc-'o'--l---o"'.o"---_-I t6 2.soo ,I O.oo5 I 0.0145-o.1sss 0.0000 o.0000 +_.,o."o•:cc'cco.___+-_,oc:.oo=•::4_+---"'0.:0001 o.o o.o >--1~,----+--,,~_,J,~1"_-::_-:,_f--.~}.,_o"'."oot"',::~_-11--::_1o:_.,ri.ci"4~5--1-_.,o".2:C-o,;co.___-+_.,o".oooo=.____1_o-'.oooo""'-,_--l-_o='."o,'c-1"','-+-"oc:.oo=•':c--+--"0C::.000=1,_+-;co."o---+----"'"·o_--1 ---*---.. --; ooo;c"'':'-+'-":-'·:;2:c~"----+-,:": .. :-:c;:'---+-':":~c;;'=;:::-----+-':"'::,,,,::----+-__ ~:j::jft::~~::!:"'."·~f':~;t:::;:::::f:~t:j;i;::::t::~:j::j!._1._' ::::t::::1:i:~:::::::;1::::::j:j:~t:::::=;+ 0 _ _.2_.o _ ---e----~'"· ;o"~'-+l _.;o-:::oo~u o.o t 74 o.2ss2 o.oooo:C---+---"o'".oooo""'._+_.,o._.lO:c9c:8.___+--:o:c:_0~1"J71 -+---"o"".000=1._+-c:-o."o--+----""-"·o~---1 21 3 333 o.oo:c•:---e-----"o"o""c-•._-1----"o-".2C:Cn:c6::----+~-::o-".oooo~::---+--"o."oooo=_+---'o.,_."11"3'=3_+---"o".o_.1:cJ•::---+-o~."000=1_+-_oc'.o:C---+--~o."o_-l ~ 22 3 soo o.006 0.0114 0.2900 _;o:c.oooo~"----+--"o".oooo~._-1-_o:c.-'-''cc'~o_+--:o:c.o,;1-cJ1::---+--::o".000=1._+_:co."o __ +---::o-".o_---J 23 3.667 o:006 0.0174 0.3074 0.0000 0.0000 o.1s10 0.0140 0.0001 o.o o.o l--;'::'---+--''"-8-'-D'---'-' -;0.007 o.0203 0.3277 0.0000 0.0000 0.1676 0.0166 0.0002 o.o o.o 25 __ .____4_.,II0"0~,'-"0.007 0.0203 0.3480 0.0000 0.0000 0.1846 0.0169 0.0002 0.0 0.0 --·2z--I 4 167 ] 0.007 0.0203 0.3683 0.0000 0.0000 0.2018 0.0172 0.0002 0.0 0.0 f--21 1 4 :m 0.001 : 0.0203 o.3886 0.0000 ---tl--'o".oooo=._+-_ooc·cc'c"'9~2._+--"o".0~1c:c1•::---+_.,o."000=2._+_o:c."'-+-·~oc'.o"---_-I i------3s 4 SOO I 0.007 0.0203 0.4089 0.0000 OJ)OOO 0.2368 0.0!76 0.0002 0.0 0.0 1--29 ! 4.667 o.ooi 0.0203 0.4292 0.0000 0.0000 o.2546 0.011& 0.0002 o.o o.o l---::'"o-~l-~4~.8~l~J--l-~o~.oo~s~2-l-;o~.0~1J~s~+~o~.4~5~Jo,__4 ___,o~.oooo~,__+-:;o~.oooo~~~_.o~-~27~5~7--l-~o~.0~2~1~1-l-~o.~000~2::----l--o~-~o-~ _ _.,o~.o_--1 3l : 5.000 0.0082 0.0238 0.4768 0.0000 0.0000 0.2969 0.0213 0.0002 -+-_,Oc,.O:--f----'O~.o,__ __ ~ 3:2 ! 05~1~6'--+--~"c·l)(~J8~2.___+-~0.0238 0.5005 0.0000 0.0000 0.3184 0.0214 0.0002 0.0 0.0 f---::,::,-_-_--Jt_· _--~'"'"''-'-l--"o.,.oo="'--l---"'o~o .. 23"'~-1---"-o."',-"""'._-1-_.,o.,.oooo=,_--+--o.(l{X)(I--o.3400 0.0216 0.0002 o.o o.o "'"'---+---'-'"'.500""--f--"o".oo~s"2'---~1_.o".0"'2"1"'-L-o'".,.,4 .. 8-;t_+_.,_o."oooo""'_-l'-'o".oooo=.,___-1---"o".J:.;6~18,__+-o.,_.~02,_,,t8,_+--'o".ooo=,_2_-l-----'o~.o.,___ __ J__.o".o"-----I l-----·~'"'--1-~':c·66~'--l---'o"'.oo,,,,s"-2 -e-----"o . .,o .. 2,"s'--l----"oC:.,c;,1,c19,_-+--"o,,.oooo""''---l---"-o . .,oooo='-+-_.o.,_."38;3:::6_+--_,.oc,.o,-2,.1 ''--+--"'o."000=2.___-l--'o:C. o::---_ +' -~0-70_---< 36 5.8]3 0.0095 0.0276 0.5994 0.0000 0.QOOO 0.409[ 0.0255 0.0003 0.Q I 0.Q 37 1 6.000 0.0095 0.0276 0.6270 0.0000 0.0000 0.4348 0.0256 0.0003 0.0 0.0 ~-i ~.167 0.0095 0.0276 0.6545 0.(H)()() 0.0000 0.4606 0.0258 0.00:)] 0.0 0.0 39 6.:m o.0095 0.0276 0.6&21 o.(H)()() 0.0000 0.4865 o.0259 0.0003 o.o o.o ~---r----","'.,~oo'--+---"a'".oo'"•",'--l--oc'.0~2~1-",-+--o:C_'c,096"""-+_.,o."'oooo=-+-o"'.oooo"""'--+--"o".,"1"2•'---+-o~."016()=-+--:o".ooo=~,-+-----'o".o'--e-----'oc'.o'----l 41 Ts-6.667 0.0095 i 0.0276 0.7372 0.0000 0.0000 0.5385 0.0261 0.0003 0.0 0.0 ~--6.833 0.0134 0.0389 0.7160 0.0000 0.0000 0.5755 0.0369 0.0004 0.0 0.0 43 7.000 0.0134 0.0389 0.8149 0.0000 0.0000 0.6126 0.0371 0.0004 0.0 0.0 44 7. 167 0.0134 0.0389 0.853& 0.0000 0.0000 0.6498 0.0372 0.0004 0.0 0.0 45 7.333 0.018 0.0522 0.9060 0.0005 0.0005 0.7000 0.0502 0.0011 i 0.1 0.0 Const~uction Runoff-10YR.XLS 10/3/2006 6:10 PM __ ,_I) _____ , (~) -+ '·-~(]-+}-~-~'~4~) -.--,-----'=','----___ i~) --L _____ c'(cc''~-+~c-ii(8c')=~'c-c'~'"'s) ~+-i'"=O'c) --~-~~'"'-~')--+---'~'=')~_, 11111'.' , Time ___ '-~P_,""'~·ip~----'="'="=---+-~A~'='"=mul PERVIOUS AREA. __ +--c!M=PE=R=V~l,O=U=S_,A~R~>=CA~+---oi-T=°'='ool -l---~lnstant_e-~D="~''~"--l ,.. -1;;~;1\ie~it--; (hrs.) 1 D1strib Rainfall Ram!~~ -~n-:---·1 lncre. Accum lncre Runoff Rowrate +~fl=o~w="="~' _, ----1 (fraction) (inch~s) i (inches) Run{)~ __ J _ Runoff· Runoff Runoff (inches} (~~~L-{cfs) ---1 ----+~====,-==~+-,~==-+-"r,=nches) -(l0Ch0,'c,)-J--c(in=,'ch=esc-)-+-,",,=,h<c=,-)-t~==-r, ~ --,I-~=~-< 46 I 1 . .100 0.018 ---"i_0~-._05,-c2'"2~_,r_"-o.c:95c:8,_,2~-l---"o-'oo"2'°1'---l--o"-."oo"-,"''-+--'o"-.7'-'5"'0'-4-f-0.0504 0.0023 i 0.3 0.1 --"--+-,-,_-"-"'~-+--o--_034 1 0.0986 1.os6s o.c>os9 o.ooM o.8460 ·-o=o=,~so--+--o_-00-,-,--+,--o~.,~-+---,_-,---1 --:~-,--_ -+-,: --:-~oo--~--+-· f~;-~ ~:~~~j : ::~!~~ ~.~ 6.~: i~ ~:~~~} · +-~~-~~;~;'c;-+-~:~:~-:7 : 7 (-~' --;~:~--<--:~:;~---1 50 i s 167 +--~-'otsco"1js:_::~:_::"o"_"o'-sf2i2_::_::~_::_::f1.Ji-=c'":~,--'9_::_::_::t_::Joj_04l,.o'",t_::j_::_::-;_o""_c;-009\\"-,---1.i26",-+-~o~o~,~P7 "_,_ 70.70-,o~,-+--7,_-,--+--0.8- 51 ! s.333---0.0134 , o.0389 1 usn 0.0574 _-o"'oo=":---+---'c:1"64"8:-+--'o"_o"'J"':;'-+--'o'".oo~s,_1 _+--"'--'--+-r_-_-_--::70".79_::_::_::_::; -~----+--l 8.:SOo 0.0134 1 0.0389 1.4216 o.0657 ---1-·-·-::o-::.ooc:s;,,,_+-'-''--::'o-cJ-::o-+-_,oc:-0"'1"s",-+--::o-::_oo;c,~''--_ _-'-"''--+--'o".,~---l ~_ 53 _---_-_ 8.667 ~).01]4 1 0.0389 [ 1.4604_ __ .. ----·-o.oi«---0 0088 1.2412 0.0382 0.009~1:-+-~L~l--t--::Oc:-'---l ____ s4 _J~f'__J___Q.oo8s 0.0255_ 1.______!.:"':8uo 00805 o.0060 1.2663 0.0251 o.0oo"'c:'~+--o"'.c:-'-+--::o-°',_--1 55 9.01){) 0.0088 0.0255 1.5 ! 15 0.0867 0 0062 I 29! '.'i 0.0251 0.0064 0 8 0.9 56--~·9.1(~0.0088 -:-0.0255 l.5370 00931 0.0()64 1.3166 0.0251 0.0066 0.8 0.9 ;r·---r--~:~~ ~~~~~----T -:::-:::~C:Ci;c'i~7,--,:~:;c-~;""~:--+:-:"~"oc.:;:-+-:::-:::-::,'-c:~+-~: :-::~:'c1"':-+-;~}~f---,-::c."':"~0:~-+--:":::--+--cc~:~:---1 59 9.667 o.0088 ---o"-::_0'°2,cc,~-!:--,1c:_,'c1,",:--+:-o:-,","is:-+-::o-::oo","o~+-~,_cc39"2cc1-+-"o~0252-+--::,:c_oo=12:-+--'o"'_,~-+-:-oc:_,:---1 --"'w 9.833 0.0088 0:0255--'~-:,-:_,'c,o:-,:-, -+--:o:-_"'12"'oc:c,-+--'o-'.00"1c'2'-+-'-',",°',,"'i-+--:oc:_o;;,,;,;2-o.0074 o.9 o.8 ---(i 1 10.000 0.0088 o.0·2"""-+--"'"'-•cc64cc6:--+-"c'-;c' 2~s"-o-+--'o--'oo='•:-+--'-'"44""2='~+--'o"-_o:c2~,"2_+---::"-::-oo-::'cc':-+--::o".,_-+_-::occ-':----l -(i2 10.167 0.0088 0.0255 , -c''c:-'90~>-+-::"-:''cis~•~+--oc'.oo='='-+--'''--':;'-:cn:-+-::o-=0~2,;;2~+-'',c.:·0011 o.9 o.9 "63:--+-~,-'o".,",'-, --1-o=-_=-oo"',c:,-+-1::i:oz55·-·l 1.7156 o.1433 0.0011 1.4929 0.0252 o.oo:i,"9-+--'o".,'----,l--o:C_,:---1 64 !0.500 0.0088 0.0255 1.7412 0.1512 0.0079 J.5181 0.0252 0.0081 0.9 0.9 1--::,-cc,--+-",o"-_,c'6C.:7-+-~o.0088 o.0255 l.7667 0.1592 0.0081 1.5434 0.0252 0.0082 1.0 o.9 1--::676--+~c-',oc:_,~,-:,,--r-::o_7.oo~,~,1-+-~o~_o:c20=,-+-1-,~,,",~•-+1-0_~16~6-0cc--+-o:-'006==-,-+--;,~_,~,~.o:-+-0=_=02~~cc--+l-0C:_oo=•~•-+-:-o--;_,:-----,-~,~-':----1 1-:-,=-,--+-c-'11:"_ooo·-+:-o:c_ooccc12::--+--::o_"occ20"'9~+-:c,'c_,~o,"•:--t:-o".1"',:c-":-+-::0_=006=,~+--,:c_,o:,~.=,-+-~o--;_oc:,"o,::--+-::o_=oo"',"o~+-o-:c_o:-,--1----::,_'o.9--l (i8 T1 J 67 0.0072 1 0.0209 1.3293 0.1798 0.0010 ---y·0w"s",.--+--:oc'_o:C2"0"',-+-~o--;_oo=,,-, -+--::oc.:_,--+---i,:c_,.-----l u9 ll..:...~~i,-+--o-'oo=,=,-+-1 -'o=_o'-20=,~-1-~:":!=;=~1~, -+-~-'i-''-'-:~~J~~-+~o-'_00"1'1~~ · --l.6260 0.0207 o.oon I o.8 o.9 ---,,-0 1 _=--__ , _1 1 1 1 s 6 ~00,=,-~-'"~-oo-'12~_, 1 _o~_'-02=0=•-+·_,-='-=-___ J_ ( _ ·.t_-o~-:c,-:.64~67:--+-o::ccm"'o"',~+--:o:c_oo=,'-',-+, ---',"_,c-_-_::-~;_::_::=-=occ_'-9c-_-_-_-_,-1 ===-+' ~0~.00--72~-le-_o_=02~0=9-+--'1=892_U O 2013 0.0073 1.6673 0 0207 0.0074 0.9_-lf----0=-'~--l -~= 7?. --------r-11 833 0.0071 0.0209 1 t.9lif-·-· O"i68c, --+-~o'ioo=-,"'•.--+1-,cc""'"'o-+--:0"0"2"0~,-+--::o~.ooc:-,~,~-!,---:0'.9 o.9 73 l?..000 0.0072 0.0209 1.9-Sii 0.2!61 0.0075 1.7087 0.0207 0.0076 0.9 0.9 -·-·1~,--J-=1'-2'-,,'-,-+,~0~.oo--7,~_-e--o_=o"~-o'-_2-_-__ ~_---9°'5~46c---!I-Occ2~2:{-37;,-+~0C:.00oc7;,;6;-+-,c'cc",c9cc4_+--;0c;-0~2~0~7-f-,:;0;-00;7;_;7.-----0.9 0.9 _ 7 1 6 5 12_333 0.0012 0.0209 1~i;ns5 o.2314 0.0011 i 1.7501 0.0201 0.001s. --=,'-_,--+-~,-'_,---l ~---+--'12'-.s~oo-'-1--0 __ 00 7 1_2~4,_o~-'='='='-+-~''-~---!+=-}~o~.2~,~,j,::t:}of-~oot\,s~~i~~71=-~'~\10~1;:}~};o~-~0~2~0J,;:t:Joj.oof~1\,~~+_::_::~o;.,~_::_::~~_::_::_::o;.~,~~~~" i7 ! 2 66 7 0.0072 0.0209 2.017i_-_1_0os'_;::24;:7,;-1-+--;0~00~79i-+-cLoc7,c9"14;-+--'0~0~2",0'.C7_+--;:0';.00:;;;80;,-+--;:0c;-'--+-~O~-'---l r--,~,--+-~12~_~8J~,-+-~o-.oo-'s,--+--0_=0=1,~,-+-~,_~,~,,'-'-8 o.2535 o.0063 1.8078 0.0164 o.0064 o.8 o.9 79 I 3.000 0.0057 0.0165 ---i'~-'c"'"::':'~-+1-'c:-'so'-;,":c--+~Oc::-OOoc64,:;--+-,c';,'24""2_+--;0c;-0~};64:;.-+-;;'-,;;006~5:_ ,-~"~-'~-l-~0~-'~---1 '-~s70--+-'-13~_~1,",-+-~o-.oo~,,~_,,1-00°0·'1•'~5--2.0668 o.2663 o 0064 J.8406 0.0164 o.0065 o.8 o.8 ,_~,-,--+--13~_-33~,-+--,,-.oo":ST-+-,o~.0~1:06~5-+--,s'_o:i:,~J"'i4-+-;;o_"'21'°2"s-+--:oi-oo=,"-,-+--;1c;_,::;,a:,o~+-o".;0~164;;--+1-o:'_0066~0---+--;o:c;_,;--+---:o".s:C----l ,--'7'--+j--' 1~ __ ,o_o_+---'""'00=57:-+-::0-c:O,:I6"5'--+---"'"-o-'-,,",'---+-'o".2"'1"94:__'1-"-"·"oo"',"''--+--''-'-'~''"''-'-+--""o=·_"o~',=6464~-+-~"-~006""7~+--o~-~'--+-~"--'---1 ,-. _83 1~.~67 00057 0.0165 2.1!64 0.2860 I 0.0066 !.8898 0.0067 0.8 0.8 --~_j_ __ J_.l0~83~3~+--'o'".00=57:-+-""-"o",6"5'--+---;c'-'-'"-33"0'---l--::0-'.2~92-,_7:_-1--"'"-"00"'6C,:7_+--"-1.9062 o 0164 0.0068 0.8 0.8 85 14 000 0.0057 0.0165 2.1495 0.2994 I 0.0067 l.9226 0.0164 0.0068 0.8 0.8 '"--s6-" -i 1-i 161 0.0051 1 0.0165 2.1660 o.3062 0.0068 1)n90 0.0164 o.0069 o.8 1__ o.8 --ff 1 14_3:n 0.0051 0.016s 2.1~.2_s_·= -::'"_J 01J~1'--·~r-:_-:_ofoof•to~-:_!-:_-:_"'1"-_~,cc,tsi•-:_-:_t-:_ioj.oi1"64}:__-_-_J-_-_"o::c-toot,io-:_-:_1-:_::_-;o_"8 ----r o.8 _, ss 14.500 0.0051 0.0165 2.1991 o.J200 o.0069 t.9718 0.0164 0.0010 "o~_,---·-~o-_,~---< -,:co,:--1--',-'•"',"',,:-+--oc'_oo=s"'1-+-~o".0'017'6f 2.2156 o.3270 o 0010 1.9882 o.Ol64 0.0011 o 8 o.s ----::C--+---'c-""'~1--'~cl--+-~• 90 14 833 0.005 0.0!45 2.2301 0.3331 0.0062 2.0026 0.0144 0.0062 0.7 0.8 ------~,:, _::_::_::t_::_::jrsjooojf_:::t_::joj.ooi~s_::_::~_:::oj.of1J•c:s-+---i''-"'44~6-+-::"-::-'cc''~'~+--''"'-006~"2-+--;'co-Oc;1-'-,o'-+-"'"-c:o.:c144=---1'--""--oo~,~J---l~--""-~'--1---::occ-'---1 --::":--+--'c:'.c-1-;c•c:-'---,-~o--;-oo~s-+--:"c:·"~'-'•c:-'-+-~'c-::-"c:'•.;'--+-::""'-'"'"~''--+--'o"'.oo~•:;2_+--;2co-o~J"'14:-+-"'o."0"144=---1'--""006~c:-'-+--'""--':-----,e--o::c-':---1 93 15.333 0.005 O.Ol45 2.i736 0.3519 0.0063 2.0458 0.0144 0.0064 0.1 0.8 +---:'~•----,--''7'7500""---+-~o-~oo~s:--+--::"--"~-'-1•~'~+--::'-"'~"~'~-1--::"~-'~""21--l--o~-:::006""'3-+--''"-~~072_+-~o".o-'-144==----,-"::c-0064~"---+--'o~-':--1--o~-78~--1 95 15.667 0.005 0~0145 2.3026 0.3646 0.0064 2.0746 0.0144 0.0065 0.8 0.8 +--'c:'~---,--''"'--:c'·:c":-+---:C0.005 0.0145 2.3171 0.3710 0.0064 2.0890 0.0144 0.006"5~+-0~-78_-l---::Occ-8_--l 97 16.000 0.005 00145 2.3316 0.3774 0.0065 2.\034 0.0144 0.0065 __ + _ _-0"'.8'--I--O:C.0:-8--j +--,,,,--',-~ro:c_"ro~,1-+---0.005 0.0145 2.3461 o.3839 o.oo6S 2.1178 o.0144 0.0066 0.8 0.8 99 : 1(i.cJ:3cc'-+-~oc-oo~s-+_,oc-_o:-o:-c1•c:'-+--::'cc'w~6-+--::"c-,·'"'°"':-+-":c·c::oocc,c''-+-~':c-· 'c:i-c'22:-+-":"-o:-':c44"---+-::"c:·oo~••:-+--'""'-'--+--::"--;-':----l -'~oo-'-+----'~'"·'=oo~-1-~o~oo-'--'-,-+-_o~-o~,~'~'-+-~''--'-''='-'-+--o=-_,_J9~7_,_o_4_~o_.oo66 2.1466 0.0144 o.0067 o.8 o.s 101 16.667 0.005 0.0145 2.3896 o.4036 0.0066--2T61cio-+--::oc:_o:c,-c44:--+--,c:oc:_006~7.--+-70_c:,--+--::o~_,.----l 102 16.8:13 0.004 0.0116 2.4012 0.4090 0.0053 2.1725 0.0115 0.0054 0.6 0.8 \03 J7 .000 ---;:Oie.004~-t--;Oc;.0"1-;1',-6-f--:2,'.4;,lc;2';-8-+_0;s'--;-4;;14col_+--i0co.OOSS7J -f--s2',->,,84,cl'--+-'O;c-0;:->:-;1c;5_+i-,O:c;-003'.754,-+--;:0~-6:_-+_I-Occ. 7,------j ,_~, 70,--J-----~1-,_,--,~,:,c::_--+-'""'-004~-+--''"-0eclc:1"6-+-_2:c-':c244c:::_+-"'-::•:c""'-+--'o".oo'-""5::•_f--'''-'-'-'-9,.56'--l--o"_.,o'-'11c,5: _ _, _ _.o"'_oo'-""s::•_+--'o".6'---+---'o"_,'---~ 1-~'705~------"~-~JJ~3-+-_0ec-004~--l--"~-c:o:c11:,6c_+---;c'::'c:''"o'--+-"o"'.4"'25"1'---l--o"-_"'oo~,::''-+--''"-';,"~'=-'-+-""'"-o._1"15,_-l--'o".oo""'s"s-+---'o"''---I---""--=-'----, '°':--+--,"~s,,oo"'--+--"o:C_004~-+-":c·o::.-.:11:,6_+---i'2.=44;;'~'-+-::oc:-•"'o::,,'--+--o;c--:,oo;c,::''-+-~'"-2;,;1~87:---1---""-"o._1 "1,,_+-''"-00'-""'"''-+---'o"'.6'----'l---'o""_=-, _--I -------rr>? 17.667 0.004 0.0116 2.4592 0.4359 0.0054 2.2302 0.0115 0.0055 0.6 0.7 ---c;'":;'--t-'c""·'~'"l-1--:"c:·004~-+--'""-':::'c:1",-+-_2:c-•::1~0:c,_+-::"-::44cc1c;,'--+--';o,~-oo:;,;:';--l--::'-.;24~J~7-+-_,o"'.0"1-'1"s-+--"""'-oo"s;c,'--+-"o_.,,_-+_-::oc;-'~--1 109 18.000 0.004 0.0116 2.4824 0.4469 0.0055 2.2532 0.0115 0.0056 0.7 0.7 110 18.167 0.004 0.0116 2.4940 0.4524 0.0055 2.2648 0.0115 0.0056 0.7 0.7 Ill 18.333 0.004 0.0116 2.5056 0.4S79 0.0055 2.2763 0.0115 0.0056 0.7 0.7 --·11:: 18.500 0.004 0.0116 2.5172 0.4635 0.0056 2.2878 0.0115 0.0056 0.7 0.7 _ ~1-'l'c-3-+--''-"'-;:'::,671-+--::0--::0040:--:---l-O:C_O:-Q:-C11160_+--cc2"52"8,c8_+-::0~-4~69'-cl~+-O~-cc00,c5cc6_+--:'cc·2::c99.;,4:--!--::0-c:0._1cc15:---l--Oc'.00""'5"6_+-'--0C,.Jc-_l--O:C.c-7_---, -~":-c4--+-""c:·'~'"'J_1--:co_004•::-;--e--::"'c"-'' cc''~+--::2c:-'cc404~-+--::'::--'cc'"'•':-+-::o-ccoo;cs:c•~+--''"-"' 1"'0-'c'-+--::occ.o:;'=":-+-::"·-:coo~,:c'~+--o'".=-'-+--::"-"''---1 l!S !9.000 0.004 0.0116 2.5520 0.4803 0.0056 2.3224 O.Ol15 0.0057 0.7 0.7 Construction Runoff-lOYR.XLS 10/3/2006 6:10 PM (I) 1 ___ ill ()) I (4) {5) (6) (7) (8) (9) (10) (11) I (l 2) ~- Precip Accumul. PERVious AREA Th1PERVl01JS AREA Total Instant Design l,= I Time lm.:re ' -xncr~men1 ~rs ) D1strib I R;1infa!I Rainfall • locn, Accum lncre. Runoff Flowrnte Flowrate Acc_~'!I~. ~-- (fraction) I (in1,:hes) (inches) Runoff _ __j_ Runoff Runoff Rw1off (inches) (cfs) (cfs) ---(inches) i (ioches) (inches) (inches) 116 J 9.167 0.004 0.0116 2.5636 0.4860 0.0057 2.3340 0.0115 0.0057 0.7 ' 0.7 o.0057 _j__ ------- 117 I 9.333 0 004 0.0116 2.5752 0.4916 + 2.3455 0.0115 0.0057 0.7 I 0.7 118 -19 500 0004 0.0116 2.5868 0.4973 0.0057 2.)570 0.0115 0.0058 0.7 0.7 ' -119 l 9.667 O.OU4 0.0116 2.5984 0 5031 -·: 0 0057 2.3686 0.0115 ~-0.0058 0.7 0.7 !2.0 0.004 a.OJ 16 2.6100 --2.380! O.Ol 15 0~005S ' l 9.833 0.5088 0 0057 I 0.7 0.7 -- !21 20.00CI 0.004 0.0116 2.62!6 0 5146 I 0.0058 2.3917 O.Ol LS 0.0058 0.7 0.7 l 22 I 20.167 0.004 0.0116 -·-2~332 0.5204 I 0.0058 2.4032 o.15115·--0.0058 0.7 0.7 1 :n 20.333 0.004 i 0.0116 -· 2.6448 0 5262 I 0.0058 2.4l47 o.011_5_ 0.0059 0.7 0.7 124 i 20.500 0.004 I 0.0116 2.6564 0.5320 ' 0.0058 2.4263 o.oi'TS 0.0059 0.7 0.7 --~-'--i..-20.667 0.004 o.Off6 2.6680 0 5379 ' 0.0059 2.4378 o.off5 0.0059 0.7 0.7 !2(1 20.813 ' 0.004 0.0116 2.6796 0.5438 0.0059 2.4494 o.0115~ 0.0059 0.7 0.7 I-------·1·--2-i.ooo -·2.6912 --127 ' 0.004 0.0116 0.5497 0 0059 2.4609 0.0115 0.0060 0.7 0.7 ! 28 21.!67 0.004 O.OJ 16 2.?ifzg" 0.5556 0.0059 2.4724 0.0115 0.0060 0.7 0.7 ! 29 21.333 0.004 0.0116 2.7144 0.5615 0 0059 2.4840 0.01 L5 0.0060 0.7 0.7 ---- 130 2! .500 0.004 0.0116 ·2.nuo 0.5675 0.0060 2.4955 0.0115 0.0060 0.7 0.7 l 3 I 21.667 0.004 0.0116 2.7376 0.5735 0.0060 2.507[ O.OJ 15 0.0060 0.7 07 I 32 2! .833 0.004 0.0116 2.7492 0.5795 I 0.0060 2.5186 0.0115 0.0061 0.7 0.7 ·---· I 33 22.000 0.004 0.0116 2.7608 0 5855 0 0060 2.5301 0.0115 0.0061 0.7 0.7 ------ l 34 2:!.167 0.004 O.OJ 16 2 7724 0.5916 0.0060 2.5417 o:Oi ts 0.0061 07 0.7 135 22.333 0.004 -- 0.0116 2.7840 0.5976 0.0061 2.5532 0.0115 0.0061 0.7 0.7 1]6 22.500 6.004 0.0116 2.7956 0.6037 0.0061 2.5648 0.0115 0.0061 0.7 0.7 I )7 r 22.667 0.004 0.0116 2.8072 0.6098 0.006[ 2.5763 0.0115 0.0062 07 0.7 I 38 2i.83J" 0.004 0.0116 2.8! 88 0.6160 0.0061 2.5879 O.Ql 15 0.0062 0.7 0.7 - 139 . ,--23.000 0004 0.0116 2.8304 0.6221 0.0062 2.5994 0.0115 0.0062 0.7 0.7 ~ -- 140 ! 2~_1_62.___-l-0.004 0.0l 16 2.8420 0.6283 0.0062 2.6110 0.0115 0.0062 0.7 0.7 -----··-·-2.6225 141 23.JB 0.004 0.0116 2.8536 0.6345 0.0062 0.0115 0.0062 0.7 0.7 -----142 23 500 0.004 O.Ql 16 2.8652 0 64-07 0.0062 2.6341 0.0115 0.0063 0.7 0.7 143 -2T667--· -""0.004 0.0116 2.8768 I 0.6469 0.0062 2.6456 0.0115 0.0063 0.7 0.7 144 ·---T3.833 0.004 0.0116 2 8884 I 0.6532 0.0063 2.6572 0.0115 0.1Xl63 0.7 0.7 145 24 000 0.004 0.0116 2.9000 I 0.6594 0.0063 2.6687 0.0115 0.0063 0.7 0.7 Construction Runoff-lOYR.XLS 10/3/2006 6:10 PM Runoff Curve Numbers for Urban Areas TRSS Chapter Z Estimating Rwioff Technical Release 55 Urban Hydrology for Small Watersheds Table 2-2a Runoff curve numbers for urban areas J/ ----------Cover description ---------- Curve numbers for ---hydrologic soil group --- Cover type and hydrologic condition Average percent impeIVious area 21 Fully developed urban areas (vegetation established) Open space Qawns, parks, golf courses, cemeteries, etc.)a': Poor condition (grass cover < 50%) .............................•............ Fair condition (grass cover 50% to 75%) .................................. Good condition (grass cover > 75%) ......................................... Impervious areas: Paved parking lots, roofs, driveways, etc. ( excluding right-of-way) ............................................................. Streets and roads: Paved; curbs and stonn sewers (excluding right-0f-way) ................................................................................ Paved; open ditches ("mcluding right-of.way) .......................... Gravel (including right-of-way) ................................................. Dirt (including right-of-way) ...................................................... W estem desert urban areas: Natural desert landscaping (pervious areas only)~ ..................... Artificial desert landscaping (impervious weed barrier, desert sluub with 1-to 2-inch sand or gravel mulch and basin borders) ...................................................................... Urban districts: Commercial and business ................................................................. Industrial ............................................................................................. Residential districts by average lot size: 1/8 acre or less (town houses) .......................................................... 1/4 acre ................................................................................................ 1/3 acre .................. ·-··-········ .. ························ .. ························•············ 1/2 acre ................................................................................................ 1 acre ....................................................................................... _ ....... _ ... 2 acres .................................................................................................. Developing urban areas Newly graded areas (pervious areas only, no vegetation) r1 ._ ....... -....................... -,~ .................... .. Idle lands (CN's are determined using cover types similar to those in table 2-2c). 1 Average runoff condition, and I.= 0.2S. 85 72 65 38 30 25 20 12 A B C D 68 79 86 89 49 69 79 84 39 61 74 80 98 98 98 98 98 98 98 98 83 89 92 93 76 85 89 91 72 82 87 89 63 77 85 88 96 96 96 96 89 92 94 95 81 88 91 93 77 85 90 92 61 75 83 87 57 72 81 86 54 70 80 85 51 68 79 84 46 65 77 82 77 86 91 94 2 The average percent impervious area shown was used to develop the composite CN's. Other asswnptlons are as follows: impervious areas are directly connected to the drainage system, impervious areas have a CN of 98, and pervious areas are considered equivalent to open space in good hydrologic condition. CN's for other combinations of conditions may be computed using figure 2..:3 or 2-4. 3 CN's shown are equ1va1ent to tltose of pasture. Composite CN's may be computed for other combinations of open space cover type. 4 Composite CN's for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage (CN = 98) and the pervious area CN. The pervious area CN's are a$Wlled equiva1ent to desert shrub in poor hydro logic condition. 6 Composite CN's to use for the design of temporary measures during grading and construction should be computed using figure 2--3 or 2-4 based on Ule degree of development (impervious area percentage) and t.he CN's for the newly graded pervious areas. (210-Vl-TR-65, SecondEd,June 1986) 2-5 Chapter 2 Estimating Runoff Technical Release 55 Urban Hydrology for Small Watersheds Table 2-2b Runoff curve numbers for cultivated agricultural lands 11 Curve numbers for Cover description hydrologic soil group Hydrologic Cover type Treatment 21 condition ;y A B c. D Fallow Bare soil 77 86 91 94 Crop residue cover (CR) Poor 76 85 90 93 Good 74 83 88 90 Row crops Straight row (SR) Poor 72 81 88 91 Good 67 78 85 89 SR+CR Poor 71 80 87 90 Good 64 75 82 85 Contoured (C) Poor 70 79 84 88 Good 65 75 82 86 C+CR Poor 69 78 83 87 Good 64 74 81 85 Contoured & terraced (C&T) Poor 66 74 80 82 Good 62 71 78 81 C&T+CR Poor 65 73 79 81 Good 61 70 77 80 Small gram SR Poor 65 76 84 88 "\ Good 63 75 83 87 SR+CR Poor 64 75 83 86 Good 60 72 80 84 C Poor 63 74 82 85 Good 61 73 81 84 C+CR Poor 62 73 81 84 Good 60 72 80 83 C&T Poor 61 72 79 82 Good 59 70 78 81 C&T+CR Poor 60 71 78 81 Good 58 69 77 80 Close-seeded SR Poor 66 77 85 89 or broadcast Good 58 72 81 85 legumes or C Poor 64 75 83 85 rotation Good 55 69 78 83 meadow C&T Poor 63 73 80 83 Good 51 67 76 80 1 Average runoff condition, and I.=0.28 2 Crop residue cover applies only if residue is on at ]east 5% of the surlace throughout the year. s Hydraulic condition is based on combination factors that affect infiltration and runoff, including (a) density and canopy of vegetative areas, (b) amount of year-rowtd cover, ( c) amount of grass or clooe-seeded legumes, ( d) percent of residue cover on the land surface (good ~ 20%), and (e) degree of surface roughness. Poor: Factors impair in:lilb'atlon and tend to increase runoff. Good: Factors encourage average and better than average lnfiltnt.ion and tend to decrease runoff. \ } 2-6 (210-VJ-TR-55, Second Ed., June 1986) Chapte.-2 Estimating Runoff Table 2-2c Runoff curve numbers for other agricultural lands II -----------Cover description ----------- Cover type Pasture, grassland, or range---continuous forage for grazing. 'Ii Meadow-continuous grass, protected from grazing and generally mowed for hay. Brush-brush-weed-grass mixture with brush· the major element.~ Woods-grass combination ( orchard or tree farm). f,/ Woods.f,/ Fannsteads-buildings, lanes, driveways, and surrounding lots. 1 Average runoff condition, and Ia = 0.28. 2 Poor: <50%) ground cover or heavily grazed with no mulch. Fair: 50 to 75% grormd cover and not heavily grazed Good: > 75% ground cover and lightly or only occasionally grazed 3 Poor. <50% ground cover. Fair: 50 to 75% grormd cover. Good: > 75% ground cover. Hydrologic condition Poor Fair Good Poor Fair Good Poor Fair Good Poor · Fair Good 4 Actual curve number is Jess than 30; use CN = 30 for runoff computations. Technical Release 55 Urban Hydrology for Small Watersheds Curve numbers for hydrologic soil group A B C D 68 79 86 89 49 69 79 84 39 61 74 80 30 58 71 78 48 67 77 83 35 56 70 77 30V 48 65 73 57 73 82 86 43 65 76 82 32 58 72 79 45 66 77 83 36 60 73 79 30V 55 70 77 59 74 82 86 5 CN's shown were computed for areas with 50% woods and 5006 grass (pasture) cover. Other combinations of conditions may be computed from the CN's for woods and pasture. 6 Poor: Forest litter, small trees, and brush are destroyed by heavy grazing or regular burning. Fair: Woods are grazed but not burned, and some forest litter covers the soil. Good: Woods are prolecU!d from grazing, and litter and brush adequately cover the soil. (210-VI-TR-66, Second Ed, June 1986) 2-7 Chapter 2 Estimating Runoff Technical Release 55 Urban Hydrology for Small Watersheds Table 2-2d Runoff cuive numbers for arid and semiarid rangelands 11 Curve munbers for Cover description hydrologic soil group Hydrologic Cover type condition~ A;Jf B c. D Herbaceous-mixture of grass, weeds, and Poor 80 87 93 low-growing brush, with brush the Fair 71 81 89 minor element. Good 62 74 85 Oak-aspen-mountain brush mixture of oak brush, Poor 66 74 79 aspen, mountain mahogany, bitter brush, maple, Fair 48 57 63 and other brush. Good 30 41 48 Pinyon-juniper-pinyon, juniper, or both; Poor 75 85 89 grass understory. Fair 58 73 80 Good 41 61 71 Sagebrush with grass understory. Poor 67 80 85 Fair 51 63 70 . Good 35 47 55 ) rt shrub-major plants include saltbush, Poor 63 77 85 88 greasewood, creosotebush, blackbrush, bursage, Fair 55 72 81 86 palo verde, mesquite, and cactus. Good 49 68 79 84 l Average runoff condition, and Iai = 0.28. For range in humid regions, use table 2-2c. 2 Poor: <30% ground cover (litter, grass, and brush overstory). Fair. 30 to 70% ground cover. Good: > 70% ground cover. ' Cwve numbers for group A have been developed only for desert sh.rub. (210-VI-TR-66, Second Ed, June 1986) Seahawks Headquarters and Training Facility Sediment Pond Stage-Volume Calculation (SWPPP) Water Depth Slope Pond Bottom Length• (ft) (HorNer) (ft) 0 2 150 0.5 2 150 2 150 1.5 2 150 2 2 150 2.5 2 150 3 2 150 • Assuming a square pond Pond Volume (cf) 0 11,400 23,100 35,100 47,400 60,000 72,900 Attachment C List of Site Construction BMPs Stonnwater Pollution Prevention Plan -Attachment C Seahawks Headquarters and Training Facility, Renton, Washington The following includes a list of the BMPs to be implemented on the site. • Buffer Zones (BMP Cl 02) • High Visibility Plastic or Metal Fence (BMP C 103) • Stabilized Construction Entrance (BMP C105) • Construction Road/Parking Area Stabilization (BMP Cl 07) • Sediment Trap (BMP C240) • Temporary Sediment Pond (BMP C241) • Straw Bale Barrier (BMP C230) • Silt Fence (BMP C233) • Sediment Trap (BMP C240) • Storm Drain Inlet Protection (BMP C220) • Portable Water Storage Tanks (e.g., Baker Tank) for Sedimentation. • Temporary and Permanent Seeding (BMP Cl20) • Sodding (BMP Cl24) • Topsoiling (BMP Cl25) • Dust Control (BMP C!40) • Early application of gravel base on areas to be paved • Temporary and Permanent Seeding (BMP Cl20) • Interceptor Dike and Swale (BMP C200) • Pipe Slope Drains (BMP C204) • Check Dams (BMP C207) VULCJ-19589-510 C-1 Attachment D Inspection Forms .RETEC Site Inspection Form General Information Project Name: Inspector Name: Title: CESCL#: Date: Time: Inspection Type: 0 After a Rain Event OWeekly 0 Turbidity/transparency benchmark exceedance Oother Weather Precipitation Since last inspection? DYes ONo In last 24 hours? DYes 0No Description of General Site Conditions: Inspection of BMPs Element 1: Mark Clearing Limits BMP: Location Inspected Functioning Problem/Corrective Action y N y N NIP 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP: Location lnsoected Functioning Problem/Corrective Action y N y N NIP 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Element 2: Establish Construction Access BMP: Location Inspected Functioning Problem/Corrective Action y N y N NIP 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 BMP: Location Inspected Functioning Problem/Corrective Action y N y N NIP 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 912712006 C.\DOCUME-1\wchen\l0CALS-1\Tel"Tl)\notes8B0720\Appendix F SWPP.:ds .RETEC Site Inspection Form General Information Project Name: Inspection of BMPs Element 3: Control Flow Rates BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D Element 4: Install Sediment Controls BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D 9127/2006 C:\OOCUME-1\v,,::hen\LOCALS-1\Te~\notes8B0720\Appendix F SW PP.xis G,RETEC Site Inspection Form General Information Project Name: Inspection of BMPs Element 5: Stabilize Soils BMP: Functioning Inspected Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D. D D D D D Element 6: Protect Slopes BMP: Inspected Functionlna Problem/Corrective Action Location y N y N NIP D D D D D 0 D D D D 0 D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D 0 . D D 0 D 0 D D D D 0 BMP: Inspected Function Ina Problem/Corrective Action Location y N y N NIP D D 0 D 0 D D 0 D 0 D D 0 D 0 912712006 . C.\DOCUME-1\~hen\LOCALS-1\Te~\ncites8B0720\Append1x F SWPP.Jds ORETEC Site Inspection Form General Information Proiect Name: Inspection of BMPs Element 7: Protect Drain Inlets BMP: Functioning Inspected Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D Element 8: Stab/1/ze Channels and Outlets BMP: Inspected Functioning Problem/Corrective Action Location ·y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functioning Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D BMP: Inspected Functionina Problem/Corrective Action Location y N y N NIP D D D D D D D D D D D D D D D 912712006 C.IDOCUME-1\wchenlLOCAlS-l\TefTll\nolesaB0720\AppendiX F SWPP,xls .RETEC Site Inspection Form General Information Proiect Name: Inspection of BMPs Element 9: Control Pollutants BMP: Location lnsoected Functioning Problem/Corrective Action y N y N NIP D D D D D D D D D D D D D D D BMP: Location Inspected Functioning Problem/Corrective Action y N y N NIP D D D D D D D D D D D D D D D Element 10: Control Dewatering BMP: Location Inspected Functioning Problem/Corrective Action y N y N NIP D D D D D D D D D D D D D D D BMP: Location lnsoected Functioning Problem/Corrective Action y N y N NIP D D D D D D D D D D D D D D D BMP: Location lnsoected Functioning Problem/Corrective Action y N y N NIP D D D D D D D D D D D D D D D 9/2712006 C:\DOCUME-1\wchen\L0CALS-1\TelllJVI01es8B0720\Appeodlx F SWPP.xls Site Inspection Form General Information Project Name: Stormwater Discharges From the Site Observed Problem/Corrective Action y N Location: Turbidity D D Discoloration D D Sheen D D Location: Turbidity D D Discoloration D D Sheen D D Water Quality Monitoring Was any water quality monitoring conducted? 0Yes 0No If water quality monitoring was conducted, record results here: If water quality monitoring indicated turbidity 250 NTU or greater; or transparency 6 cm or less, was Ecology notified by phone within 24 hrs? OYes 0No If Ecology was notified, indicate the date, time, contact name and phone number below: Date: Time: Contact Name: Phone#: General Comments and Notes Include BMP repairs, maintenance, or installations made as a result of the inspection. Were Photos Taken? 0Yes 0No If photos taken, describe photos below: 912712006 C.IDOCUME-1\wchen\LOCALS-1\T8ff1J\notes8B0720\Appendlx F SW PP.xis I Attachment E Construction Stormwater General Permit Issuance Date: November 16, 2005 Effective Date: December 16, 2005 Expiration Date: December 16, 20 I 0 CONSTRUCTION STORMW ATER GENERAL PERMIT National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit for Stormwater Discharges Associated With Construction Activity State of Washington Department of Ecology Olympia, Washington 98504-7600 In compliance with the provisions of The State of Washington Water Pollution Control Law Chapter 90.48 Revised Code of Washington and The Federal Water Pollution Control Act (The Clean Water Act) Title 33 United States Code, Section 1251 et seq. Until this permit expires, is modified or revoked, Permittees that have properly obtained coverage under this general permit are authorized to discharge in accordance with the special and general conditions which follow. David C. Peeler Mana er Water Quality Program Washington State Department of Ecology Page 2 of 46 TABLE OF CONTENTS SUMMARY OF PERMIT REPORT SUBMITTALS .................................................................... .3 SUMMARY OF REQUIRED ON SITE DOCUMENTATION .................................................... .3 SPECIAL CONDITIONS SI. PERMIT COVERAGE ....................................................................................................... .4 S3. COMPLIANCE WITH STANDARDS ............................................................................... 9 S4. MONITORING REQUIREMENTS .................................................................................. 10 S5. REPORTING AND RECORD KEEPING REQUIREMENTS ......................................... 15 S6. PERMIT FEES ................................................................................................................... 18 S7. SOLID AND LIQUID WASTE DISPOSAL ........................................................... : ........ 18 S8. DISCHARGES TO 303(d) OR TMDL WATERBODIES ............................................... .18 S9. STORMWATERPOLLUTION PREVENTIONPLAN ................................................... 21 S 10. NOTICE OF TERMINATION ......................................................................................... .29 GENERAL CONDITIONS .......................................................................................................... .30 GI. DISCHARGE VIOLATIONS ................ : ......................................................................... .30 G2. SIGNATORY REQUIREMENTS ..................................................................................... 30 G3. RIGHT OF INSPECTION AND ENTRY ........................................ : ................................ 31 G4. GENERAL PERMIT MODIFICATION AND REVOCATION ...................................... 31 GS. REVOCATION OF COVERAGE UNDER THE PERMIT ............................................. 31 G6. REPORTING A CAUSE FOR MODIFICATION ............................................................ 32 G7. COMPLIANCE WITH OTHER LAWS AND ST A TUTES ............................................. 32 GS. DUTY TO REAPPLY ....................................................................................................... 32 G9. TRANSFER OF GENERAL PERMIT COVERAGE ....................................................... 32 G!O. REMOVED SUBSTANCES ............................................................................................. 33 Gil. DUTY TO PROVIDE INFORMATION .......................................................................... .33 G 12. OTHER REQUIREMENTS OF 40 CFR. .......................................................................... 33 G 13. ADDffiONAL MONITORING ........................................................................................ 33 014. PENALTIES FOR VIOLATING PERMIT CONDITIONS ............................................ .33 G15. UPSET .............................................................................................................................. .34 G 16. PROPERTY RIGHTS ........................................................................................................ 34 G 17. DUTY TO COMPLY .......................................................................... : ............................. 34 G18. TOXIC POLLUTANTS ..................................................................................................... 34 019. PENALTIES FOR TAMPERING ......................................................... : .......................... .35 G20. REPORTING PLANNED CHANGES .............................................................................. 35 G21. REPORTING OTHER INFORMATION .......................................................................... 35 ) Page 3 of 46 022. REPORTING ANTICIPATED NON-COMPLIANCE .................................................... .35 023. REQUESTS TO BE EXCLUDED FROM COVERAGE UNDER THE PERMIT ......... .36 024. APPEALS ......................................................................................................................... .36 025. SEVERABILITY .............................................................................................................. .36 026. BYPASS PROIDBITED ................................................................................................... .36 APPENDIX A-DEFINITIONS .................................................................................................. .39 APPENDIX B -ACRONYMS ................................................................................................... ..46 SUMMARY OF PERMIT REPORT SUBMITTALS Refer to the Special and General Conditions for additional submittal requirements. Permit Submittal Frequency First Submittal Date Section S5.A High Turbidityffransparency Phone As Necessary Within 24 hours Reporting S5.B Discharge Monitoring Report Monthly Within 15 days after the applicable monitoring period S5.F Noncompliance Notification As necessary Immediately SS.F Noncompliance Notification -Written As necessary Within 5 Days of non- Report compliance 02. Notice of Change in Authorization As necessary 06. Permit Application for Substantive As necessary Changes to the Discharge 08. Application for Permit Renewal I/permit cycle No later than 180 days before expiration 09. Notice of Permit Transfer As necessary 020. Notice of Planned Changes As necessary 022. Reporting Anticipated Non-compliance As necessary SUMMARY OF REQUIRED ON SITE DOCUMENTATION Permit Conditions Document Title Conditions S2. SS Permit Coverae:e Letter Conditions S2. SS Construction Stormwater General Permit Conditions S4, SS Site Loe: Book Conditions S9, SS Stormwater Pollution Prevention Plan (SWPPP) Page4 of46 SPECIAL CONDITIONS SI. PERMIT COVERAGE A. Permit Area This general permit covers all areas of Washington State, except for federal and tribal lands specified in Sl.D.3. B. Operators Required to Seek Coverage Under this General Permit: 1. Operators of the following construction activities are required to seek coverage under this permit: a. Clearing, grading and/or excavation which results in the disturbance of one or more acres, and discharges stormwater to su,face waters of the state; and clearing, grading and/or excavation on sites smaller than one acre which are part of a larger common plan of development or sale, if the common plan of development or sale will ultimately disturb one acre or more, and discharges stormwater to surface waters of the state. 1. This includes forest practices that are part of a construction activity that will result in the disturbance of one or more acres, and discharges to surface waters of the state (i.e., forest practices which are preparing a site for construction activities); and b. Any size construction activity discharging stormwater to waters of the state which the Department of Ecology (Ecology): 1. Determines to be a significant contributor of pollutants to waters of the state of Washington, or n. Reasonably expects to cause a violation of any water quality standard. 2. Operators of the following activities are not required to seek coverage under this permit, unless specifically required under Condition S l .B. l .b. (Significant Contributor): · a. Construction activities which discharge all stormwater and non-stonnwater to ground water, and have no point source discharge to surface water or a storm sewer system that drains to surface waters of the state; b. Construction activities covered under an Erosivity Waiver (Condition S2.C); c. Routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of a facility. 1 Page 5 of 46 C. Authorized Discharges: 1. Stormwater Associated with Construction Activity. Subject to compliance with the terms and conditions of this permit, Permittees are authorized to discharge stormwater associated with construction activity to surface waters of the state or to a storm sewer system that drains to surface waters of the state. 2. Stormwater Associated with Construction Support Activity. This permit also authorizes stormwater discharges from support activities related to the permitted construction site (e.g., off-site equipment staging yards, material storage areas, borrow areas, etc.) provided: a. The support activity is directly related to the permitted construction site that is required to have an NPDES permit; and b. The support activity is not a commercial operation serving multiple unrelated construction projects, and does not operate beyond the completion of the construction activity; and c. Appropriate controls and measures are identified in the Stonnwater Pollution Prevention Plan (SWPPP)for the discharges from the support activity areas. 3. Non-Storm water Discharges. The categories and sources of non-storrnwater discharges identified below are conditionally authorized, provided the discharge is consistent with the terms and conditions of this permit: a. Discharges from fire fighting activities; b. Fire hydrant system flushing; c. Potable water including uncontaminated water line flushing (de-chlorinated); d. Pipeline hydrostatic test water; e. Uncontaminated air conditioning or compressor condensate; f. Uncontaminated ground water or spring water; g. Uncontaminated excavation de-watering (in accordance with S9.D.10) h. Uncontaminated discharges from foundation or footing drains; 1. Water used to control dust; J. Routine external building wash down that does not use detergents; and k. Landscape irrigation. Page 6 of 46 All authorized non-stormwater discharges, except for discharges from fire fighting activities, shall be adequately addressed in the SWPPP and comply with Special Condition S3. D. Limitations on Coverage The Director may require any discharger to apply for and obtain coverage under an individual permit or another more specific general permit. Such alternative coverage will be required when Ecology determines that this general permit does not provide adequate assurance that water quality will be protected; or there is a reasonable potential for the project to cause or contribute to a violation of water quality standards. · The following stormwater discharges are not covered by this permit: I. Post-1?onstruction stormwater discharges that originate from the site after construction activities have been completed and the site has undergone final stabilization. 2. Nonpoint source silvicultural activities such as nursery operations, site preparation, reforestation and subsequent cultural treatment, thinning, prescribed burning, pest and fire control, harvesting operations, surface drainage, or road construction and maintenance from which there is natural runoff as excluded in 40 CFR Subpart 122.27. 3. Stormwater from any federal project or project on federal land or land within an Indian Reservation except for the Puyallup Reservation. Within the Puyallup Reservation, any project that discharges to surface water on land held in trust by the federal government may be covered by this permit. 4. Stormwater from any site covered under an existing NPDES individual permit in which stormwater management and/or treatment requirements are included for all stormwater discharges associated with construction activity. 5. Where an applicable Total Maximum Daily Load (TMDL) specifically precludes or prohibits discharges from construction activity, the operator is not eligible for coverage under this permit. S2. APPLICATION REQUIREMENTS A. Permit Application Forms 1. Notice of Intent Formffimeline a. Operators of new or previously unpermitted construction activities shall submit a complete and accurate permit application form [Notice of Intent (NOi)] to Ecology. Applicants are encouraged to use Ecology's internet-based electronic NOI to apply for permit coverage. b. The NOi shall be submitted on or before the date of the first public notice (see Condition S2.B below) and at least 60 days prior to the discharge of stormwater -·~-..... I Page 7 of 46 from construction activities. The 30-day public comment period required by WAC 173-226-130(5) begins on the publication date of the second public notice. Unless Ecology responds to the complete application in writing, based on public comments, or any other relevant factors, coverage under the general permit will automatically commence on the thirty-first day following receipt by Ecology of a completed NOi, or the issuance date of this permit, whichever is later; unless a later date is specified by Ecology in writing. c. Applicants that discharge to a storm sewer system operated by Seattle, King County, Snohomish County, Tacoma, Pierce County, or Clark County shall also submit a copy of the NOi to the appropriate jurisdiction. 2. Transfer of Coverage Form Cum,nt coverage under this permit may be transferred to one or more new operators, including operators of sites within a Common Plan of Development, by submitting a Transfer of Coverage Form in accordance with Condition G9. Transfers do not require public notice. B. Public Notice For new or previously unpermitted sites, the applicant shall publish a public notice at least one time each week for two consecutive weeks, with a 7-day time span between dates, in a newspaper that has general circulation in the county in which the construction is to take place. The notice shall contain the following: 1. A statement that "The applicant is seeking coverage under the Washington State Department of Ecology's Construction Stormwater NPDES and State Waste Discharge General Permit"; · 2. The name, address and location of the construction site; 3. The name and address of the applicant; 4. The type of construction activity that will result in a discharge, ( e.g., residential construction, commercial construction, etc.) and the number of acres to be disturbed; 5. The name of the receiving water(s) (i.e., the surface water(s) that the site will discharge to), or if the discharge is through a storm sewer system, the name of the operator of the storm sewer; and 6. The statement: "Any person desiring to present their views to the Department of _Ecology regarding this application, or interested in the Department's action on this application may notify the Department of Ecology in writing within 30 days of the last date of publication of this notice. Comments can be submitted to: Department of · Ecology, P.O. Box 47696, Olympia, WA 98504-7696, Attn: Water Quality Program, Construction Stormwater". Page 8 of 46 C. Erosivity Waiver Operators may qualify for a waiver from the permit if the following conditions are met: 1. The site will result in the disturbance of less than S acres; and the site is not a portion of a common plan of development or sale that will disturb S acres or greater. 2. Calculation of Erosivity "R" Factor and Regional Timeframe: a. The project's rainfall erosivity factor ("R" Factor) must be less than S during the period of construction activity, as calculated using the Texas A&M University online rainfall erosivity calculator at: http://ei.tamu.edu/. The period of construction activity begins at initial earth disturbance and ends with final stabilization; and, in addition: b. The entire period of construction activity must fall within the following timeframes: 1. For sites west of the Cascades Crest: June IS-September IS; or n. For sites east of the Cascades Crest, excluding the Central Basin: June IS - October I S; or 111. For sites east of the Cascades Crest, within the Central Basin*: no additional time frame restrictions apply. *_Note: The Central Basin is defined as the portions of Eastern Washington with mean annual precipitation ofless than 12 inches. 3. Operators must submit a complete Erosivity Waiver Certification Form at least one week prior to commencing land disturbing activities. Certification must include: a. A statement that the operator will comply with applicable local stormwater requirements; and b. A statement that the operator will implement appropriate erosion and sediment control BMPs to prevent violations of water quality standards. 4. This waiver is not available for facilities declared a significant contributor of pollutants as defined in Condition S l.B. l.b. 5. This waiver does not apply to construction activity which includes non-stormwater discharges listed in SI.C.3. 6. If construction activity extends beyond the certified waiver period for any reason, the opera tor shall either: ' Page 9 of 46 a. Recalculate the rainfall erosivity "R" factor using the original start date and a new projected ending date and, if the "R" factor is still under 5 and the entire project falls within the applicable regional timeframe in S2.C.2.b, complete and submit an amended waiver certification form before the original waiver expires; or b. Submit a complete permit application to Ecology in accordance with Condition S2.A and B before the end of the certified waiver period. S3. COMPLIANCE WITH STANDARDS A. Discharges shall not cause or contribute to a violation of surface water quality standards (Chapter 173-201 A WAC), ground water quality standards (Chapter 173-200 WAC), sediment management standards (Chapter 173-204 WAC), and human health-based criteria in the National Toxics Rule ( 40 CFR Part 131.36). Discharges that are not in compliance with these standards are not authorized. B. Prior to the discharge of stormwater and non-stormwater to waters of the state, the Permittee shall apply all known, available, and reasonable methods of prevention, control, and treatment (AKAR1). This includes the preparation and implementation of an adequate Stormwater Pollution Prevention Plan (SWPPP), with all appropriate best management practices (BMPs) installed and maintained in accordance with the SWPPP and the terms and conditions of this permit. C. Compliance with water quality standards shall be presumed, unless discharge monitoring data or other site specific information demonstrates that a discharge causes or contributes to a violation of water quality standards, when the Permittee is: I. In full compliance with all permit conditions, including planning, sampling, monitoring, reporting, and recordkeeping conditions; and 2. Fully implementing stormwater BMPs contained in stormwater management manuals published or approved by Ecology, or BMPs that are demonstrably equivalent to BMPs contained in stormwater technical manuals published or approved by Ecology, including the proper selection, implementation, and maintenance of all applicable and appropriate BMPs for on-site pollution control. D. For sites that discharge to both surface water and ground water, all ground water discharges are also subject to the terms and conditions of this permit. Permittees who discharge to ground water through an injection well shall comply with any applicable requirements of the Underground Injection Control (UIC) regulations, Chapter 173-218 WAC. Page 10 of 46 S4. MONITORING REQUIREMENTS The primary monitoring requirements are summarized in Table 3 (below): Table 3. Summary of Monitoring Requil'eme;nts 1 ' ' Size of Soil Disturbance' Weekly Weekly ··w~· . ·W:ee1'1y . ,:· ·,, .,¥ Site Sampling w/ s~~\vi . pH . hispectiens Turbidey Me~1:1r :r~;s~~~'¥ ·, safilpling3 ' ,' ·• ' ,-"!;~ • j-",i,;., ~:·' .. · .. -,., .: '.: Sites which disturb less than I Required Not Required Not Required Not acre Reouired . Sites which disturb I acre or Required Sampling Required-either Required more, but less than 5 acres method4 Sites which disturb 5 acres or Required Required Not Required 5 Required more A. Site Log Book The Permittee shall maintain a site log book that contains a record of the implementation of the SWPPP and other permit requirements including the installation and maintenance ofBMPs, site inspections, and stormwater monitoring. B. Site Inspections I. Site inspections shall include all areas disturbed by construction activities, all BMPs, and all stormwater discharge points. Stormwater shall be visually examined for the 1 Additional monitoring requirements may apply for: I) discharges to 303( d) listed water bodies and waterbodies with applicable TMDLs for turbidity, fine sediment, high pH, or phosphorus -see Condition S8; and 2) sites required to perfo,m additional monitoring by Ecology order -see Condition G 13. 2 Soil disturbance is calculated by adding together all areas affected by construction activity, Construction Activity means clearing, grading, excavation, and any other activity which disturbs the surface of the land, including ingress/egress from the site. 3 Beginning October I, 2006, if construction activity involves significant concrete work or the use of engineered soils, and sto,mwater from the affected area drains to a stormwater collection system or other surface water, the Permittee shall conduct pH sampling in accordance with Condition S4D. · 4 Beginning October I, 2008, sites with one or more acres, but less than 5 acres of soil disturbance, shall conduct turbidity or transparency sampling in accordance with Condition S4.C. 5 Beginning October I, 2006, sites greater than or equal to 5 acres of soil disturbance shall conduct turbidity sampling using a turbidity meter in accordance with Condition S4.C. Page 11 of 46 presence of suspended sediment, turbidity, discoloration, and oil sheen. Inspectors shall evaluate the effectiveness ofBMPs and determine if it is necessary to install, maintain, or repair BMPs to improve the quality of stormwater discharges. Based on the results of the inspection, the Pennittee shall correct the problems identified as follows: a. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the inspection; and b. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but no later than 10 days of the inspection; and c. Document BMP implementation and maintenance in the site log book. 2. The site inspections shall be conducted at least once every calendar week and within 24 hours of any discharge from the site. The inspection frequency for temporarily stabilized, inactive sites may be reduced to once every calendar month. 3. Site inspections shall be conducted by a person who is knowledgeable in the principles and practices of erosion and sediment control. The inspector shall have the skills to: a. Assess the site conditions and construction activities that could impact the quality of stormwater, and b. Assess the effectiveness of erosion and sediment control measures used to control the quality of stormwater discharges. 4. Beginning October 1, 2006, construction sites one acre or larger that discharge storm water to surface waters of the state, shall have site inspections conducted by a Certified Erosion and Sediment Control Lead (CESCL). The CESCL shall be identified in the SWPPP and shall be present on-site or on-call at all times. Certification shall be obtained through an approved erosion and sediment control training program that meets the minimum training standards established by Ecology (see BMP Cl 60 in the Manual). 5. The inspector shall summarize the results of each inspection in an inspection report or checklist and be entered into, or attached to, the site log book. At a minimum, each inspection report or checklist shall include: a. Inspection date and time. b. Weather information; general conditions during inspection and approximate amount of precipitation since the last inspection, and within the last 24 hours. c. A summary or list of all BMPs which have been implemented, including observations of all erosion/sediment control structures or practices. d. The following shall be noted: i. locations of BMPs inspected, Page 12 of 46 ii. locations ofBMPs that need maintenance, iii. the reason maintenance is needed, iv. locations ofBMPs that failed to operate as designed or intended, and v. locations where additional or different BMPs are needed, and the reason(s) why. e. A description of stormwater discharged from the site. The inspector shall note the presence of suspended sediment, turbid water, discoloration, and/or oil sheen, as applicable. f. Any water quality monitoring performed during inspection. g. General comments and notes, including a brief description of any BMP repairs, maintenance or installations made as a result of the inspection. h. A statement that, in the judgment of the person conducting the site inspection, the site is either in compliance or out of compliance with the terms and conditions of the SWPPP and the permit. If the site inspection indicates that the site is out of compliance, the inspection report shall include a summary of the remedial actions required to bring the site back into compliance, as well as a schedule of implementation. 1. Name, title, and signature of the person conducting site inspection; and the following statement: "I certify that this report is true, accurate, and complete, to the best of my knowledge and belief'. C. Turbidity/fransparency Sampling Requirements I. Sampling Methods/Effective Dates a. Beginning October 1, 2006, if construction activity will involve the disturbance of 5 acres or more, the Permittee shall conduct turbidity sampling per Condition S4.C. b. Beginning October 1, 2008, if construction activity will involve greater than or equal to I acre, but less than 5 acres of soil disturbance, the Permittee shall conduct transparency sampling or turbidity sampling per Condition S4.C. 2. Sampling Frequency a. Sampling shall be conducted at least once every calendar week, when there is a discharge of stormwater ( or authorized non-stormwater) from the _site. Samples shall be representative of the flow and characteristics of the discharge. b. When there is no discharge during a calendar week, sampling is not required. c. Sampling is not required outside of normal working hours or during unsafe conditions. If a Permittee is unable to sample during a monitoring period, the Discharge Monitoring Report (DMR) shall include a brief explanation. Page 13 of 46 3. Sampling Locations a. Sampling is required at all discharge points where stonnwater ( or authorized non- stormwater) is discharged off-site. b. All sampling point(s) shall be identified on the SWPPP site map and be clearly marked in the field with a flag, tape, stake or other visible marker. 4. Sampling and Analysis Methods a. Turbidity analysis shall be performed with a calibrated turbidity meter (turbidimeter), either on-site or at an accredited lab. The results shall be recorded in the site log book in Nephelometric Turbidity Units (NTU). b. Transparency analysis shall be performed on-site with a I :Y. inch diameter, 60 centimeter ( cm) long Transparency Tube. The results shall be recorded in the site log book in centimeters ( cm). Transparency Tubes are available from: http://watennonitoringeguip.com/pages/stream.html Turbidity NTU Transparency cm SM2130 or EPA180.l Manufacturer instructions, or Ecology Guidance 5. Turbidity/Transparency Benchmark Values Weekly, if discharging Weekly, if discharging 25NTU 31 cm The benchmark value for turbidity is 25 NTU (Nephelometric Turbidity Units); and the benchmark value for transparency is 31 cm. a. Turbidity 26 -249 NTU, or Transparency 30 -7 cm: If discharge turbidity is greater than 25 NTU, but less than 250 NTU; or if discharge transparency is less than 31 cm, but greater than 6 cm, the CESCL shall: i. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the discharge that exceeded the benchmark; and ii. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but within 10 days of the discharge that exceeded the benchmark; and iii. Document BMP implementation and maintenance in the site log book. b. · Turbidity 250 NTU or greater. or Transparency 6 cm or less: Page 14 of 46 If discharge turbidity is greater than or equal to 250 NTU; or if discharge transparency is less than or equal to 6 cm, the CESCL shall: i. Notify Ecology by phone in accordance with Condition S5.A.; and ii. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the discharge that exceeded the benchmark; and iii. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but within 10 days of the discharge that exceeded the benchmark; iv. Document BMP implementation and maintenance in the site log book; and v. Continue to sample discharges daily until: I . turbidity is 25 NTU ( or lower); or 2. transparency is 31 cm ( or greater); or 3. the CESCL has demonstrated compliance with the water quality standard for turbidity: a. no more than 5 NTU over background turbidity, if background is less than 50 NTU, or b. no more than I 0% over background turbidity, if background is 50 NTU or greater; or 4. the discharge stops or is eliminated. D. pH Monitoring: Sites with Significant Concrete Work or Engineered Soils Beginning October I, 2006, if construction activity will result in the disturbance of I acre or more, and involves significant concrete work or the use of engineered soils, and stormwater from the affected area drains to surface waters of the state or to a storm sewer system that drains to surface waters of the state, the Permittee shall conduct pH monitoring as set forth below: I. For sites with significant concrete work, the pH monitoring period shall commence when the concrete is first exposed to precipitation and continue weekly until stormwater pH is 8.5 or less. a. "Significant concrete work" means greater than I 000 cubic yards poured concrete or recycled concrete. 2. For sites with engineered soils, the pH monitoring period shall commence when the soil amendments are first exposed to precipitation and shall continue until the area of engineered soils is folly stabilized. Page 15 of 46 a. "Engineered soils" means soil amendments including, but not limited, to Portland cement treated base (CTB), cement kiln dust (CKD), or fly ash. 3. During the pH monitoring period, the Permittee shall obtain a representative sample of stormwater and conduct pH analysis at least once per week. 4. The Permittee shall monitor pH in the sediment trap/pond(s) or other locations that receive stormwater runoff from the area of significant concrete work or engineered soils prior to discharge to surface waters. 5. The benchmark value for pH is 8.5 standard units. Any time sampling indicates that pH is 8.5 or greater, the Permittee shall: a. Prevent the high pH water (8.5 or above) from entering storm sewer systems or surface waters; and b. If necessary, adjust or neutralize the high pH water using an appropriate treatment BMP such as CO2 sparging or dry ice. The Permittee shall obtain written approval from Ecology prior to using any form of chemical treatment other than COi sparging or dry ice. 6. The Permittee shall perform pH analysis on-site with a calibrated pH meter, pH test kit, or wide range pH indicator paper. The Permittee shall record pH monitoring results in the site log book. S5. · REPORTING AND RECORDKEEPING REQUIREMENTS A. High Turbidity Phone Reporting Any time sampling performed in accordance with Special Condition S4.C indicates turbidity is 250 NTU or greater (or transparency is 6 cm or less) the Permittee shall notify the appropriate Ecology regional office by phone within 24 hours of analysis. B. Discharge Monitoring Reports I. Permittees required to conduct water quality sampling in accordance with Special Conditions S.4.C (Turbidity/I'ransparency), S4.D (pH) and/or S8 [303(d)1TMDL sampling] shall submit the results to Ecology monthly on Discharge Monitoring Report (DMR) forms provided by Ecology. Permittees are authorized and encouraged to submit electronic DMRs using the "E- DMR Form" on Ecology's Construction Stormwater web site: http://www.ecy.wa.gov/programs/wg/stormwater/construction/. 2. The Permittee shall submit DMR forms electronically or by mail to be received by Ecology within 15 days following the end of each month. If there was no discharge during a given monitoring period, the Permittee shall submit the form as required with the words "no discharge" entered in place of the monitoring results. If the Permittee is unable to submit discharge monitoring reports electronically, the Permittee may mail reports to the address listed below: Page 16 of 46 Department of Ecology Water Quality Program -Construction Stormwater PO Box 47696 Olympia, Washington 98504-7696 C. Records Retention The Permittee shall retain records of all monitoring information (site log book, sampling results, inspection reports/checklists, etc.), Stormwater Pollution Prevention Plan, and any other documentation of compliance with permit requirements during the life of the construction project and for a minimum of three years following the termination of permit coverage. Such information shall include all calibration and maintenance records, and records of all data used to complete the application for this permit. This period of retention shall be extended during the course of any unresolved litigation regarding the discharge of pollutants by the Permittee or when requested by Ecology. D. Recording of Results For each measurement or sample taken, the Pennittee shall record the following information: I. Date, place, method, and time of sampling or measurement; 2. The individual who performed the sampling or measurement; 3. The dates the analyses were performed; 4. The individual who performed the analyses; 5. The analytical techniques or methods used; and 6. The results of all analyses. E. Additional Monitoring by the Permittee If the Permittee monitors any pollutant more frequently than required by this permit using test procedures specified by Condition S4 of this permit, the results of this monitoring shall be included in the calculation and reporting of the data submitted in the Permittee's DMR. F. Noncompliance Notification In the event the Permittee is unable to comply with any of the terms and conditions of this permit which may cause a threat to human health or the environment, the Permittee shall: I. Immediately notify Ecology of the failure to comply. 2. Immediately take action to prevent the discharge/pollution, or otherwise stop or correct the noncompliance, and, if applicable, repeat sampling and analysis of any noncompliance immediately and submit the results to Ecology within five (5) days after becoming aware of the violation. · Page 17 of 46 3. Submit a detailed written report to Ecology within five (5) days, unless requested earlier by Ecology. The report shall contain a description of the noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; and the steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. Compliance with these requirements does not relieve the Permittee from responsibility to maintain continuous compliance with the terms and conditions of this permit or the resulting liability for failure to comply. G. Access to Plans and Records I. The Permittee shall retain the following permit documentation (plans and records) on- site, or within reasonable access to the site, for use by the operator; or on-site review by Ecology or the local jurisdiction: a. General Permit; b. Permit Coverage Letter; c. Stormwater Pollution Prevention Plan (SWPPP); and d. Site Log Book 2. The Permittee(s) shall address written requests for plans and records listed above (Condition S5.G. I) as follows: a. A copy of plans and records shall be provided to Ecology within 14 days of receipt of a written request from Ecology. b. A copy of plans and records shall be provided to the public when requested in writing. Upon receiving a written request from the public for the Pennittee's plans and records, the Permittee shall either: 1. Provide a copy of the plans and records to the requestor within 14 days of a receipt of the written request; or n. Notify the requestor within 10 days ofreceipt of the written request of the location and times within normal business hours when the plans and records may be viewed, and provide access to the plans and records within 14 days of receipt of the written request; or iii. Within 14 days of receipt of the written request, the Permittee may submit a copy of the plans and records to Ecology for viewing and/or copying by the requestor at an Ecology office, or a mutually agreed upon location. If plans and records are viewed and/or copied at a location other than at an Ecology office, the Permittee will provide reasonable access to copying services for which a reasonable fee may be charged. The Permittee shall notify the Page 18 of 46 requestor within IO days of receipt of the request where the plans and records may be viewed and/or copied. S6. PERMIT FEES The Permittee shall pay permit fees assessed by Ecology. Fees for stormwater discharges covered under this permit shall be established by Chapter 173-224 WAC. Permit fees will continue to be assessed until the permit is terminated in accordance with Special Condition SIO or revoked in accordance with General Condition G5. S7. SOLID AND LIQUID WASTE DISPOSAL Solid and liquid wastes generated by construction activity such as demolition debris, construction materials, contaminated materials, and waste materials from maintenance activities, including liquids and solids from cleaning catch basins and other stormwater facilities, shall be handled and disposed of in accordance with: 1. Special Condition S3, Compliance with Standards, and 2. WAC 173-216-110, and other applicable regulations. S8. DISCHARGES TO 303(0) OR TMDL WATERBODIES A. Sampling and Numeric Effluent Limitations For Discharges to 303{d)-listed Waterbodies I. l .Permittees that discharge to water bodies listed as impaired by the State of Washington under Section 303(d) of the Clean Water Act for turbidity, fine sediment, high pH, or phosphorus, shall conduct water quality sampling according to the requirements of this section. 2. All references and requirements associated with Section 303(d) of the Clean Water Act mean the most current listing by Ecology of impaired waters that exists on November 16, 2005, or the date when the operator's complete permit application is received by Ecology, whichever is later. B. Discharges to 303(d)-Listed Waterbodies (Turbidity. Fine Sediment or Phosphorus) 1. Permittees which discharge to waterbodies on the 303( d) list for turbidity, fine sediment, or phosphorus shall conduct turbidity sampling at the following locations to evaluate compliance with the water quality standard for turbidity: a. Background turbidity shall be measured in the 303( d)-listed receiving water immediately upstream (upgradient) or outside the area of influence of the discharge; and b. Discharge turbidity shall be measured at the point of discharge into the 303( d) listed receiving waterbody, inside the area of influence of the discharge; or Page 19 of 46 Alternatively, discharge turbidity may be measured at the point where the discharge leaves the construction site, rather than in the receiving waterbody. 2. Based on sampling, if the discharge turbidity exceeds the water quality standard for turbidity (more than 5 NTU over background turbidity when the background turbidity is 50 NTU or less, or more than a 10% increase in turbidity when the background turbidity is more than 50 NTU), all future discharges shall comply with a numeric effluent limit which is equal to the water quality standard for turbidity. 3. If a future discharge exceeds the water quality standard for turbidity, the Permittee shall: a. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the discharge that exceeded the standard; b. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but within 10 days of the discharge that exceeded the standard; c. Document BMP implementation and maintenance in the site log book; d. Notify the appropriate Ecology Regional Office by phone within 24 hours of analysis; e, Continue to sample daily until discharge turbidity meets the water quality standard for turbidity. C. Discharges to waterbodies on the 303( d) list for High pH 1. Pennittees which discharge to waterbodies on the 303( d) list for high pH shall conduct sampling at one of the following locations to evaluate compliance with the water quality standard for pH (in the range of 6.5 -8.5): a. pH shall be measured at the point of discharge into the 303( d) listed waterbody, inside the area of influence of the discharge; or b. Alternatively, pH may be measured at the point where the discharge leaves the construction site, rather than in the receiving water. 2. Based on the sampling set forth above, if the pH exceeds the water quality standard for pH (in the range of 6.5 -8.5), all future discharges shall comply with a numeric effluent limit which is equal to the water quality standard for pH. 3. If a future discharge exceeds the water quality standard for pH, the Permittee shall: a. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the discharge that exceeded the water quality standard; Page 20 of 46 b. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but within IO days of the discharge that exceeded the standards; c. Document BMP implementation and maintenance in the site log book; d. Notify the appropriate Ecology Regional Office by phone within 24 hours of analysis; and e. Continue to sample daily until discharge meets the water quality standard for pH (in the range of 6.5 -8.5) or the discharge stops or is eliminated. ·:waterQua:iity;',.i {, Standard'' ··.··.· · .. Turbidity Fine Sediment Phosphorus Turbidity/NTU SM2130or EPA180.l Weekly, if discharging If background is 50 NTU or less: 5 NTU overbackground;or High pH pWStandard Units pH meter Weekly, if discharging If background is more than 50 NTU: 10% over background In the range of 6.5-8.5 D. Sampling and Limitations For Sites Discharging to Applicable TMDLs I. Discharges to a waterbodies subject to an applicable Total Maximum Daily Load (TMDL) for turbidity, fine sediment, high pH, or phosphorus, shall be consistent with the assumptions and requirements of the TMDL. a. Where an applicable TMDL sets specific waste load allocations or requirements for discharges covered by this permit, discharges shall be consistent with any specific waste load allocations or reqnirements established by the applicable TMDL. ii. The Permittee shall sample discharges weekly, or as otherwise specified by the TMDL, to evaluate compliance with the specific waste load allocations or reqnirements. iii. Analytical methods used to meet the monitoring requirements shall conform to the latest revision of the Guidelines Establishing Test Procedures for the Analysis of Pollutants contained in 40 CFR Part 136. Turbidity and pH methods Page 21 of 46 need not be accredited or registered unless conducted at a laboratory which must otherwise be accredited or registered. b. Where an applicable TMDL has established a general waste load allocation for construction stonnwater discharges, but no specific requirements have been identified, compliance with Conditions S4 (Monitoring) and S9 (SWPPPs) will be assumed to be consistent with the approved TMDL. c. Where an applicable TMDL has not specified a waste load allocation for construction stonnwater discharges, but has not excluded these discharges, compliance with Conditions S4 (Monitoring) and S9 (SWPPPs) will be assumed to be consistent with the approved TMDL. d. Where an applicable TMDL specifically precludes or prohibits discharges from construction activity, the operator is not eligible for coverage under this permit. 2. Applicable TMDL means a TMDL for turbidity, fine sediment, high pH, or phosphorus, which has been completed and approved by EPA prior to November 16, 2005, or prior to the date the operator's complete permit application is received by Ecology, whichever is later. TMDLs completed after the operator's complete permit application is received by Ecology become applicable to the Pennittee only if they are imposed through an administrative order by Ecology, or through a modification of permit coverage. S9. STORMW ATER POLLUTION PREVENTION PLAN An adequate Stormwater Pollution Prevention Plan (SWPPP) for construction activity shall be prepared and implemented in accordance with the requirements of this permit beginning with initial soil disturbance and untiljina/ stabilization. A. The SWPPP shall meet the following objectives: 1. To implement Best Management Practices (BMPs) to prevent erosion and sedimentation, and to identify, reduce, eliminate or prevent stormwater contamination and water pollution from construction activity. 2. To prevent violations of surface water quality, ground water quality, or sediment management standards. 3. To control peak volumetric flow rates and velocities of stormwater discharges. B. General Requirements I. The SWPPP shall include a narrative and drawings. All BMPs shall be clearly referenced in the narrative and marked on the drawings. The SWPPP narrative shall include documentation to explain and justify the pollution prevention decisions made for the project. Documentation shall include: a. Information about existing site conditions (topography, drainage, soils, vegetation, etc.); Page 22 of 46 b. Potential erosion problem areas; c. The 12 elements ofa SWPPP in S9.D.1-12, including BMPs used to address each element; d. Construction phasing/sequence and general BMP implementation schedule; e. The actions to be taken if BMP performance goals are not achieved; and f. Engineering calculations for ponds and any other designed structures. 2. The Permittee shall modify the SWPPP if, during inspections or investigations conducted by the owner/operator, or the applicable local or state regulatory authority, it is determined that the SWPPP is, or would be, ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site. The Permittee shall take the following actions: a. Review the SWPPP for compliance with Condition S9 and make appropriate revisions within 7 days of the inspection or investigation; b. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible, but no later than IO days from the inspection or investigation; and c. Document BMP implementation and maintenance in the site log book. 3. The Permittee shall modify the SWPPP whenever there is a change in design, construction, operation, or maintenance at the construction site that has, or could have, a significant effect on the discharge of pollutants to waters of the state. C. Stormwater Best Management Practices {BMPs) BMPs shall be consistent with: I. Stormwater Management Manual for Western Washington (most recent edition), for sites west of the crest of the Cascade Mountains; 2. Stormwater Management Manual for Eastern Washington (most recent edition), for sites east of the crest of the Cascade Mountains; or 3. Other stormwater management guidance documents or manuals which provide an equivalent level of pollution prevention and are approved by Ecology; or 4. Documentation in the SWPPP that the BMPs selected provides an equivalent level of pollution prevention, compared to the applicable Stormwater Management Manuals, including: -~ \ Page 23 of 46 a. The technical basis for the selection of all stormwater BMPs (scientific, technical studies, and/or modeling) which support the performance claims for the BMPs being selected; and b. An assessment of how the selected BMP will satisfy AKART requirements and the applicable federal technology-based treatment requirements under 40 CFR part 125.3. D. SWPPP -Narrative Contents and Requirements The Permittee shall include each of the 12 elements below in S9.D.1-12 in the narrative of the SWPPP and ensure that they are implemented unless site conditions render the element unnecessary and the exemption from that element is clearly justified in the SWPPP. 1. Preserve Vegetation/Mark Clearing Limits a. Prior to beginning land disturbing activities, including clearing and grading, clearly mark all clearing limits, sensitive areas and their buffers, and trees that are to be preserved within the construction area. b. The duff layer, native top soil, and natural vegetation shall be retained in an undisturbed state to the maximum degree practicable. 2. Establish Construction Access a. Construction vehicle access and exit shall be limited to one route, if possible. b. Access points shall be stabilized with a pad of quarry spalls, crushed rock, or other equivalent BMP, to minimize the tracking of sediment onto public roads. c. Wheel wash or tire baths shall be located on site, if the stabilized construction entrance is not effective in preventing sediment from being tracked onto public roads. d. If sediment is tracked off site, public roads shall be cleaned thoroughly at the end of each day, or more frequently during wet weather. Sediment shall be removed from roads by shoveling or pickup sweeping and shall be transported to a controlled sediment disposal area. e. Street washing is allowed only after sediment is removed in accordance with S9.D.2.d. Street wash wastewater shall be controlled by pumping back on site or otherwise be prevented from discharging into systems tributary to waters of the state. 3. Control Flow Rates a. Properties and waterways downstream from development sites shall be protected from erosion due to increases in the velocity and peak volumetric flow rate of stormwater runoff from the project site, as required by local plan approval authority. Page 24 of 46 b. Where necessary to comply with S9.D.3.a., stormwater retention or detention facilities shall be constructed as one of the first steps in grading. Detention facilities shall be functional prior to construction of site improvements ( e.g., impervious surfaces). c. If permanent infiltration ponds are used for flow control during construction, these facilities shall be protected from siltation during the construction phase. 4. Install Sediment Controls a. Stormwater runoff from disturbed areas shall pass through a sediment pond or other appropriate sediment removal BMP, prior to leaving a construction site or prior to discharge to an infiltration facility. Runoff from fully stabilized areas may be discharged without a sediment .removal BMP, but shall meet the flow control performance standard ofS9.D.3.a. · b. Sediment control BMPs (sediment ponds, traps, filters, etc.) shall be constructed as one of the first steps in grading. These BMPs shall be functional before other land disturbing activities take place. c. BMPs intended to trap sediment on site shall be located in a manner to avoid interference with the movement of juvenile salmonids attempting to enter off- channel areas or drainages. 5. Stabilize Soils a. Exposed and unworked soils shall be stabilized by application of effective BMPs that prevent erosion. Applicable BMPs include, but are not limited to: temporary and permanent seeding, sodding, mulching, plastic covering, erosion control fabrics and matting, soil application of polyacrylamide (PAM), the early application of gravel base on areas to be paved, and dust control. b. Depending on the geographic location of the project, no soils shall remain exposed and unworked for more than the time periods set forth below to prevent erosion: West of the Cascade Mountains Crest During the dry season (May 1 -Sept. 30): 7 days During the wet season (October 1 -April 30): 2 days East of the Cascade Mountains Crest, except for Central Basin* During the dry season (July 1 -September 30): 10 days During the wet season (October 1 -June 30): 5 days The Central Basin*, East of the Cascade Mountains Crest During the dry Season (July 1 -September 30): 30 days During the wet season (October 1 -June 30): 15 days *Note: The Central Basin is defined as the portions of Eastern Washington with mean annual precipitation ofless than 12 inches. Page 25 of 46 The time period may be adjusted by a local jurisdiction, if the jurisdiction can show that local precipitation data justify a different standard. c. Soils shall be stabilized at the end of the shift before a holiday or weekend if needed based on the weather forecast. d. Soil stockpiles shall be stabilized from erosion, protected with sediment trapping measures, and where possible, be located away from storm drain inlets, waterways, and drainage channels. 6. Protect Slopes a. Design and construct cut and fill slopes in a manner that will minimize erosion. Applicable practices include, but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope steepness, and roughening slope surfaces (e.g., track walking). b. Off-site stormwater (run-on) or groundwater shall be diverted away from slopes and disturbed areas with interceptor dikes, pipes, and/or swales. Off-site stormwater should be managed separately from stormwater generated on the site. c. At the top of slopes, collect drainage in pipe slope drains or protected channels to prevent erosion. 1. West of the Cascade Mountains Crest: Temporary pipe slope drains shall handle the peak I 0-minute velocity of flow from a Type IA, I 0-year, 24-hour frequency storm for the developed condition. Alternatively, the 10-year, 1- hour flow rate predicted by an approved continuous runoff model, increased by a factor of 1.6, may be used. The hydrologic analysis shall use the existing land cover condition for predicting flow rates from tributary areas outside the. project limits. For tributary areas on the project site, the analysis shall use the temporary or permanent project land cover condition, whichever will produce the highest flow rates. If using the WWHM to predict flows, bare soil areas should be modeled as "landscaped area." 11. East of the Cascade Mountains Crest: Temporary pipe slope drains shall handle the expected peak flow velocity from a 6-month, 3-hour storm for the developed condition, referred to as the short duration storm. d. Excavated material shall be placed on the uphill side of trenches, consistent with safety and space considerations. e. Check dams shall be placed at regular intervals within constructed channels that are cut down a slope. 7. Protect Drain Inlets a. All storm drain inlets made operable during construction shall be protected so that stormwater runoff does not enter the conveyance system without first being filtered or treated to remove sediment. Page 26of46 b. Inlet protection devices shall be cleaned or removed and replaced when sediment has filled one-third of the available storage (unless a different standard is specified by the product manufacturer). 8. Stabilize Channels and Outlets a. All temporary on-site conveyance channels shall be designed, constructed, and stabilized to prevent erosion from the following expected peak flows: 1. West of the Cascade Mountains Crest: Channels shall handle the peak 10 minute velocity of flow from a Type IA, IO-year, 24-hour frequency storm for the developed condition. Alternatively, the IO-year, I-hour flow rate indicated. by an approved continuous runoff model, increased by a factor of 1.6, may be used. The hydrologic analysis shall use the existing land cover condition for predicting flow rates from tributary areas outside the project limits. For · tributary areas on the project site, the analysis shall use the temporary or permanent project land cover condition, whichever will produce the highest flow rates. If using the WWHM to predict flows, bare soil areas should be modeled as "landscaped area." ii. East of the Cascade Mountains Crest: Channels shall handle the expected peak flow velocity from a 6-month, 3-hour storm for the developed condition, referred to as the short duration storm. b. Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent stream banks, slopes, and downstream reaches shall be provided at the outlets of all conveyance systems. 9. Control Pollutants a. All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. b. Cover, containment, and protection from vandalism shall be provided for all chemicals, liquid products, petroleum products, and other materials that have the potential to pose a threat to human health or the environment. On-site fueling tanks shall include secondary containment. c. Maintenance, fueling, and repair ofheavy equipment and vehicles shall be conducted using spill prevention and control measures. Contaminated surfaces shall be cleaned immediately following any spill incident. d. Wheel wash or tire bath wastewater shall be discharged to a separate on-site treatment system or to the sanitary sewer with local sewer district approval. e. Application of fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' label requirements for application rates and procedures shall be followed. Page 27 of 46 f. BMPs shall be used to prevent or treat contamination of stormwater runoff by pH modifying sources. These sources include, but are not limited to: bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, dewatering concrete vaults, concrete pumping and mixer washout waters. Permittees shall adjust the pH of stormwater if necessary to prevent violations of water quality standards. g. Permittees shall obtain written approval from Ecology prior to using chemical treatment, other than CO2 or dry ice to adjust pH. 10. Control De-Watering a. Foundation, vault, and trench de-watering water, which have similar characteristics to stormwater runoff at the site, shall be discharged into a controlled conveyance system prior to discharge to a sediment trap or sediment pond. b. Clean, non-turbid de-watering water, such as well-point ground water, can be discharged to systems tributary to, or directly into surface waters of the state, as specified in S9.D.8, provided the de-watering flow does not cause erosion or flooding of receiving waters. Clean de-watering water should not be routed through stormwater sediment ponds. c. Other de-watering disposal options may include: 1. infiltration 11. transport offsite in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute state waters, 111. Ecology-approved on-site chemical treatment or other suitable treatment technologies, 1v. sanitary sewer discharge with local sewer district approval, if there is no other option, or v. use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized de-watering, d. Highly turbid or contaminated dewatering water shall be handled separately from stormwater. 11. Maintain BMPs a. All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function in accordance with BMP specifications. b. All temporary erosion and sediment control BMPs shall be removed within 30 days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Page 28 of 46 12. Manage the Project a. Development projects shall be phased to the maximum degree practicable and shall take into account seasonal work limitations. b. Inspection and Monitoring All BMPs shall be inspected, maintained, and repaired as needed to assure continued performance of their intended function. Site inspections and monitoring shall be conducted in accordance with S4. c. Maintaining an Updated Construction SWPPP The SWPPP shall be maintained, updated, and implemented in accordance with Conditions S3, S4 and S9. E. SWPPP -Map Contents and Requirements The SWPPP shall also include a vicinity map or general location map (e.g. USGS Quadrangle map, a portion of a county or city map, or other appropriate map) with enough detail to identify the location of the construction site and receiving waters within one mile of the site. The SWPPP shall also include a legible site map ( or maps) showing the entire construction site. The following features shall be identified, unless not applicable due to site conditions: I. The direction of north, property lines, and existing structures and roads; 2. Cut and fill slopes indicating the top and bottom of slope catch lines; 3. Approximate slopes, contours, and direction of stormwater flow before and after major grading activities; 4. Areas of soil disturbance and areas that will not be disturbed; S. Locations of structural and nonstructural controls (BMPs) identified in the SWPPP 6. Locations of off-site material, stockpiles, waste storage, borrow areas, and vehicle/equipment storage areas; 7. Locations of all surface water bodies, including wetlands; 8. Locations where stormwater or non-stormwater discharges off-site and/or to a surface water body, including wetlands; 9. Location of water quality sampling station(s), if sampling is required by state or local permitting authority; and Page 29 of 46 10. Areas where final stabilization has been accomplished and no further construction- phase permit requirements apply. S10. NOTICE OF TERMINATION A. The site is eligible for termination when either of the following conditions have been met: 1. The site has undergone final stabilization, all temporary BMPs have been removed, and all stormwater discharges associated with construction activity have been eliminated; or 2. All portions of the site which have not undergone final stabilization per S10.A.1 have been sold and/or transferred (per Condition G9), and the Permittee no longer has operational control of the construction activity. B. When the site is eligible for termination, the Permittee shall submit a complete and accurate Notice of Termination (NOT) form, signed in accordance with General Condition G2, to: Department of Ecology Water Quality Program -Construction Stormwater PO Box47696 Olympia, Washington 98504-7696 C. The termination is effective on the date the NOT form was received by Ecology, unless the Permittee is notified by Ecology within 30 days that termination request is denied because the eligibility requirements in Condition SI O.A have not been met. Page 30 of 46 GENERAL CONDITIONS GI. DISCHARGE VIOLATIONS All discharges and activities authorized by this general pennit shall be consistent with the terms and conditions of this general pennit. Any discharge of any pollutant more frequent than or at a level in excess of that identified and authorized by the general pennit shall constitute a violation of the tenns and conditions of this pennit. G2. SIGNATORY REQUIREMENTS A. All permit applications shall bear a certification of correctness to be signed: I. In the case of corporations, by a responsible corporate officer of at least the level of vice president of a corporation; 2. In the case of a partnership, by a general partner of a partnership; 3. In the case of sole proprietorship, by the proprietor; or 4. In the case of a municipal, state, or other public facility; by either a principal executive officer or ranking elected official. B. All reports required by this permit and other information requested by Ecology shall be signed by a person described above or by a duly authorized representative of that person. A person is a duly authorized representative only if: I. The authorization is made in writing by a person described above and submitted to the Ecology. 2. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility, such as the position of plant manager,. superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters. C. Changes to authorization. If an authorization under paragraph 02.B.2 above is no longer accurate because a different individual or position has responsibility for the overall operation of the facility, a new authorization satisfying the requirements of paragraph 02.B.2 above shall be submitted to Ecology prior to or together with any reports, infonnation, or applications to be signed by an authorized representative. D. Certification. Any person signing a document under this section shall make the following certification: "I certify under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated \ Page 31 of 46 the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." G3. RIGHT OF INSPECTION AND ENTRY The Permittee shall allow an authorized representative of Ecology, upon the presentation of credentials and such other documents as may be required by Jaw: A. To enter upon the premises where a discharge is located or where any records shall be kept under the terms and conditions of this permit. B. To have access to and copy -at reasonable times and at reasonable cost -any records required to.be kept under the terms and conditions of this permit. C. To inspect -at reasonable times -any facilities, equipment (including monitoring and control equipment), practices, methods, or operations regulated or required under this permit. D. To sample or monitor -at reasonable times -any substances or parameters at any location for purposes of assuring permit compliance or as otherwise authorized by the Clean Water Act. G4. GENERAL PERMIT MODIFICATION AND REVOCATION This permit may be modified, revoked and reissued, or terminated in accordance with the provisions of Chapter 173-226 WAC. Grounds for modification, revocation and reissuance, or termination include, but are not limited to, the following: A. When a change which occurs in the technology or practices for control or abatement of pollutants applicable to the category of dischargers covered under this permit; B. When effiuent limitation guidelines or standards ari: promulgated pursuant to the CWA or Chapter 90.48 RCW, for the category of dischargers covered under this permit; C. When a water quality management plan containing requirements applicable to the category of dischargers covered under this permit is approved; or D. When information is obtained which indicates that cumulative effects on the environment from dischargers covered under this permit are unacceptable. GS. REVOCATION OF COVERAGE UNDER THE PERMIT Pursuant with Chapter 43.21 B RCW and Chapter 173-226 WAC, the Director may terminate coverage for any discharger under this permit for cause. Cases where coverage may be terminated include, but are not limited to, the following: Page 32 of 46 A. Violation of any term or condition of this permit; B. Obtaining coverage under this permit by misrepresentation or failure to disclose fully all relevant facts; C. A change in any condition that requires either a temporary or permanent reduction or elimination of the permitted discharge; D. Failure or refusal of the Permittee to allow entry as required in RCW 90.48.090; E. A determination that the permitted activity endangers human health or the environment, or contributes to water quality standards violations; F. Nonpayment of permit fees or penalties assessed pursuant to RCW 90.48.465 and Chapter 173-224 WAC; G. Failure of the Permittee to satisfy the public notice requirements of WAC 173-226- 130(5), when applicable. The Director may require any discharger under this permit to apply for and obtain coverage under an individual permit or another more specific general permit. Permittees who have their coverage revoked for cause according to WAC 173-226-240 may request temporary coverage under this permit during the time an individual permit is being developed, provided the request is made within ninety (90) days from the time of revocation and is submitted along with a complete individual permit application form. G6. REPORTING A CAUSE FOR MODIF1CATION The Permittee shall submit a new application, or a supplement to the previous application, whenever a material change to the construction activity or in the quantity or type of discharge is anticipated which is not specifically authorized by this permit. This application shall be submitted at least sixty ( 60) days prior to any proposed changes. The filing of a request by the Permittee for a permit modification, revocation and reissuance, or termination, or a notification of planned changes or anticipated noncompliance does not relieve the Permittee of the duty to comply with the existing permit until it is modified or reissued. G7. COMPLIANCE WITH OTHER LAWS AND STATUTES Nothing in this permit shall be construed as excusing the Permittee from compliance with any applicable federal, state, or local statutes, ordinances, or regulations. GS. DUTY TO REAPPLY The Permittee shall apply for permit renewal at least 180 days prior to the specified expiration date of this permit. G9. TRANSFER OF GENERAL PERMIT COVERAGE Coverage under this general permit is automatically transferred to a new discharger, including operators of lots/parcels within a common plan of development or sale, if: Page 33 of 46 A. A written, signed agreement (Transfer of Coverage Form) between the current discharger (Permittee) and new discharger containing a specific date for transfer of permit responsibility, coverage, and liability is submitted to· the Director; and B. The Director does not notify the current discharger and new discharger of the Director's intent to revoke coverage under the general permit. If this notice is not given, the transfer is effective on the date specified in the written agreement. When a current discharger (Permittee) transfers a portion ofa permitted site, the current discharger shall also submit an updated application form (NOI) to the Director indicating the remaining permitted acreage after the transfer. When a current discharger (Permittee) transfers all portions of a permitted site to one or more new dischargers, the current discharger shall also submit a notice of termination (NOT) form to the Director. GIO. REMOVED SUBSTANCES Collected screenings, grit, solids, sludges, filter backwash, or other pollutants removed in the course of treatment or control of stormwater shall not be resuspended or reintroduced to the final eflluent stream for discharge to state waters. Gil. DUTY TO PROVIDE INFORMATION The Permittee shall submit to Ecology, within a reasonable time, all information which Ecology may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this permit or to determine compliance with this permit. The Permittee shall also submit to Ecology upon request, copies ofrecords required to be kept by this permit [40 CFR 122.41(h)]. G12. OTHER REQUIREMENTS OF 40 CFR All other requirements of 40 CFR 122.41 and 122.42 are incorporated in this permit by reference. G13. ADDITIONAL MONITORING Ecology may establish specific monitoring requirements in addition to those contained in this permit by administrative order or permit modification. G14. PENAL TIES FOR VIOLATING PERMIT CONDITIONS Any person who is found guilty of willfully violating the terms and conditions of this permit shall be deemed guilty of a crime, and upon conviction thereof shall be punished by a fine of up to ten thousand dollars ($10,000) and costs of prosecution, or by imprisonment in the discretion of the court. Each day upon which a willful violation occurs may be deemed a separate and additional violation. Any person who violates the terms and conditions of a waste discharge permit shall incur, in addition to any other penalty as provided by law, a civil penalty in the amount ofup to ten Page 34 of46 thousand dollars ($10,000) for every such violation. Each and every such violation shall be a separate and distinct offense, and in case of a continuing violation, every day's continuance shall be deemed to be a separate and distinct violation. G15.UPSET Definition -"Upset" means an exceptional incident in which there is unintentional and temporary noncompliance with technology-based permit effluent limitations because of factors beyond the reasonable control of the Permittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lackof preventive maintenance, or careless or improper operation. An upset constitutes an affirmative defense to an action brought for noncompliance with such technology-based permit effluent limitations if the requirements of the following paragraph are met. A Permittee who wishes to establish the affirmative defense of upset shall demonstrate, through properly signed, contemporaneous operating logs or other relevant evidence that: 1) an upset occurred and that the Permittee can identify the cause(s) of the upset; 2) the permitted facility was being properly operated at the time of the upset; 3) the Permittee submitted notice of the upset as required in condition S5.F; and 4) the Permittee complied with any remedial measwes required under this permit. In any enforcement proceeding, the Permittee seeking to establish the occurrence of an upset has the burden of proof. G16.PROPERTY RIGHTS This permit does not convey any property rights of any sort, or any exclusive privilege. G17.DUTY TO COMPLY The Permittee shall comply with all conditions of this permit. Any permit noncompliance constitutes a violation of the Clean Water Act and is grounds for enforcement action; for permit termination, revocation and reissuance, or modification; or denial of a permit renewal application. GI8. TOXIC POLLUTANTS The Perrnittee shall comply with effluent standards or prohibitions established under Section 307(a) of the Clean Water Act for toxic pollutants within the time provided in the regulations that establish those standards or prohibitions, even if this permit has not yet been modified to incorporate the requirement. Page 35 of 46 GI9.PENALTIESFOR TAMPERING The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders inaccurate any monitoring device or method required to be maintained under this permit shall, upon conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more than two years per violation, or by both. If a conviction of a person is for a violation committed after a first conviction of such person under this Condition, punishment shall be a fine of not more than $20,000 per day of violation, or imprisonment of not more than four (4) years, or both. G20. REPORTING PLANNED CHANGES The Permittee shall, as soon as possible, give notice to Ecology of planned physical alterations, modifications or additions to the permitted construction activity, which will result m: A. The permitted facility being determined to be a new source pursuant to 40 CFR 122.29(b); B. A significant change in the nature or an increase in quantity of pollutants discharged, including but not limited to: for sites 5 acres or larger, a 20% or greater increase in acreage disturbed by construction activity; C. A change in or addition of surface water(s) receiving stormwater or non-stormwater from the construction activity; or D. A change in the construction plans and/or activity that affects the Permittee's monitoring requirements in Special Condition S4. Following such notice, permit coverage may be modified, or revoked and reissued pursuant to 40 CFR 122.62(a) to specify and limit any pollutants not previously limited. Until such modification is effective, any new or increased discharge in excess of permit limits or not specifically authorized by this permit constitutes a violation. G2I. REPORTING OTHER INFORMATION Where the Permittee becomes aware that it failed to submit any relevant facts in a permit application, or submitted incorrect information in a permit application or in any report to Ecology, it shall promptly submit such facts or information. G22. REPORTING ANTICIPATED NON-COMPLIANCE The Permittee shall give advance notice to Ecology by submission of a new application or supplement thereto at least forty-five (45) days prior to commencement of such discharges, of any facility expansions, production increases, or other planned changes, such as process modifications, in the permitted facility or activity which may result in noncompliance with permit limits or conditions. Any maintenance of facilities, which might necessitate Page 36 of 46 unavoidable interruption of operation and degradation of effiuent quality, shall be scheduled during non-critical water quality periods and carried out in a manner approved by Ecology. G23.REQUESTS TO BE EXCLUDED FROM COVERAGE UNDER THE PERMIT Any discharger authorized by this permit may request to be excluded from coverage under the general permit by applying for an individual permit. The discharger shall submit to the Director an application as described in WAC 173-220-040 or WAC 173-216-070, whichever is applicable, with reasons supporting the request. These reasons shall fully document how an individual permit will apply to the applicant in a way that the general permit cannot. Ecology may make specific requests for information to support the request. The Director shall either issue an individual permit or deny the request with a statement explaining the reason for the denial. When an individual permit is issued to a discharger otherwise subject to the construction stormwater general permit, the applicability of the construction stormwater general pemiit to that Permittee is automatically terminated on the effective date of the individual permit. G24.APPEALS A. The terms and conditions of this general permit, as they apply to the appropriate class of dischargers, are subject to appeal by any person within 30 days of issuance of this general permit, in accordance with Chapter 43.21B RCW, and Chapter 173-226 WAC. B. The terms and conditions of this general permit, as they apply to an individual discharger, are appealable in accordance with Chapter 43.21B RCW within 30 days of the effective date of coverage of that discharger. Consideration of an appeal of general permit coverage of an individual discharger is limited to the general permit's applicability or nonapplicability to that individual discharger. C. The appeal of general permit coverage of an individual discharger does not affect any other dischargers covered under this general permit. If the terms and conditions of this general permit are found to be inapplicable to any individual discharger(s), the matter shall be remanded to Ecology for consideration of issuance of an individual permit or permits. G25. SEVERABILITY The provisions of this permit are severable, and if any provision of this permit, or application of any provision of this permit to any circumstance, is held invalid, the application of such provision to other circumstances, and the remainder of this permit shall not be affected thereby. G26. BYPASS PROHIBITED A. Bypass Procedures Bypass, which is the intentional diversion of waste streams from any portion of a treatment facility, is prohibited for storrnwater events below the design criteria for Page 37 of 46 stormwater management. Ecology may take enforcement action against a Permittee for bypass unless one of the folJowing circumstances (I, 2, 3 or 4) is applicable. 1. Bypass of stormwater is consistent with the design criteria and part of an approved management practice in the applicable stonnwater management manual. 2. Bypass for essential maintenance without the potential to cause violation of permit limits or conditions. Bypass is authorized if it is for essential maintenance and does not have the potential to cause violations of limitations or other conditions of this permit, or adversely impact public health. 3. Bypass of stormwater is unavoidable, unanticipated, and results in noncompliance of this permit. This bypass is permitted only if: a. Bypass is unavoidable to prevent loss oflife, personal injury, or severe property damage. "Severe property damage" means substantial physical damage to property, damage to the treatment facilities which would cause them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a bypass; b. There are no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, maintenance during normal periods of equipment downtime (but not if adequate backup equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass which occurred during normal periods of equipment downtime or preventative maintenance), or transport of untreated wastes to another treatment facility; and c. Ecology is properly notified of the bypass as required in Special Condition S5.F of this permit. 4. A planned action that would cause bypass of stormwater and has the potential to result in noncompliance of this permit during a storm event. The Permittee shall notify Ecology at least thirty (30) days before the planned date of bypass. The notice shall contain: · a. a description of the bypass and its cause; b. an analysis of all known alternatives which would eliminate, reduce, or mitigate the need for bypassing; c. a cost-effectiveness analysis of alternatives including comparative resource damage assessment; d. the minimum and maximum duration of bypass under each alternative; e. a recommendation as to the preferred alternative for conducting the bypass; Page 38 of 46 f. the projected date of bypass initiation; g. a statement of compliance with SEP A; h. a request for modification of water quality standards as provided for in WAC 173- 201A-I I 0, if an exceedance of any water quality standard is anticipated; and 1. steps taken or planned to reduce, eliminate, and prevent reoccurrence of the bypass. 5. For probable construction bypasses, the need to bypass is to be identified as early in the planning process as possible. The analysis required above shall be considered during preparation of the Stormwater Pollution Prevention Plan (SWPPP) and shall be included to the extent practical. In cases where the probable need to bypass is detennined early, continued analysis is necessary up to and including the construction period in an effort to minimize or eliminate the bypass. Ecology will consider the following prior to issuing an administrative order for this type bypass: a. Iftlle bypass is necessary to perform construction or maintenance-related activities essential to meet the requirements of this permit. b. Iftllere are feasible alternatives to bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, stopping prodnction, maintenance during normal periods of equipment down time, or transport of untreated wastes to another treatment facility. c. If tlle bypass is planned and schednled to minimize adverse effects on the public and the environment. After consideration of the above and tlle adverse effects of the proposed bypass and any oilier relevant factors, Ecology will approve, conditionally approve, or deny the request. The public shall be notified and given an opportunity to comment on bypass incidents of significant duration, to tlle extent feasible. Approval of a request to bypass will be by administrative order issued by Ecology under RCW 90.48.120. B. Duty to Mitigate The Permittee is required to take all reasonable steps to minimize or prevent any discharge or sludge use or disposal in violation of this pemiit that has a reasonable likelihood of adversely affecting human health or the environment. Page 39 of 46 APPENDIX A -DEFINITIONS AKART is an acronym for "all known, available, and reasonable methods of prevention, control, and treatment." AKART represents the most current methodology that can be reasonably required for preventing, controlling, or abating the pollutants and controlling pollution associated with a discharge. Applicable TMDL means a TMDL for turbidity, fine sediment, high pH, or phosphorus, which has been completed and approved by EPA prior to November 16, 2005, or prior to the date the operator's complete permit application is received by Ecology, whichever is later. Applicant means an operator seeking coverage under this permit. Best Management Practices (BMPs) means schedules of activities, prohibitions of practices, maintenance procedures, and other physical, structural and/or managerial practices to prevent or reduce the pollution of waters of the state. BMPs include treatment systems, operating procedures, and practices to control: stormwater associated with construction activity, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. Buffer means an area designated by a local jurisdiction that is contiguous to and intended to protect a sensitive area Bypass means the intentional diversion of waste streams from any portion of a treatment facility. Calendar Week (same as Week) mean_s a period of seven consecutive days starting on Sunday. Certified Erosion and Sediment Control Lead (CESCL) means a person who has current certification through an approved erosion and sediment control training program that meets the minimum training standards established by Ecology (see BMP Cl 60 in the SWMM). Clean Water Act (CWA) means the Federal Water Pollution Control Act enacted by Public Law 92-500, as amended by Public Laws 95-217, 95-576, 96-483, and 97-117; USC 1251 et seq. Combined Sewer means a sewer which has been designed to serve as a sanitary sewer and a storm sewer, and into which inflow is allowed by local ordinance. Common plan of development or sale means a site where multiple separate and distinct construction activities may be taking place at different times on different schedules, but still under a single plan. Examples include: I) phased projects and projects with multiple filings or lots, even if the separate phases or filings/lots will be constructed under separate contract or by separate owners ( e.g., a development where lots are sold to separate builders); 2) a development plan that may be phased over multiple years, but is still under a consistent plan for long-term development; and 3) projects in a contiguous area that may be unrelated but still under the same contract, such as construction of a building extension and a new parking lot at the same facility. Page40 of 46 If the project is part of a common plan of development or sale, the disturbed area of the entire plan shall be used in determining permit requirements. Composite Sample A mixture of grab samples collected at the same sampling point at different times, formed either by continuous sampling or by mixing discrete samples. May be "time- composite" (collected at constant time intervals) or "flow-proportional" (collected either as a constant sample volume at time intervals proportional to stream flow, or collected by increasing the volume of each aliquot as the flow increases while maintaining a constant time interval between the aliquots. Construction Activity means land disturbing operations including clearing, grading or excavation which disturbs the surface of the land. Such activities may include road construction, construction of residential houses, office buildings, or industrial buildings, and demolition activity. Demonstrably Equivalent means that the technical basis for the selection of all stormwater BMPs is documented within a SWPPP, including: I. The method and reasons for choosing .the stormwater BMPs selected; 2. The pollutant removal performance expected from the BMPs selected; 3. The technical basis supporting the performance claims for the BMPs selected, including any available data concerning field performance of the BMPs selected; 4. An assessment of how the selected BMPs will comply with state water quality standards; and 5. An assessment of how the selected BMPs will satisfy both applicable federal technology-based treatment requirements and state requirements to use all known, available, and reasonable methods of prevention, control, and treatment (AKART). Department means the Washington State Department of Ecology. Detention means the temporary storage of stormwater to improve quality and/or to reduce the mass flow rate of discharge. De-watering means the act of pumping ground water or stormwater away from an active construction site. Director means the Director of the Washington Department of Ecology or his/her authorized representative. Discharger means an owner or operator of any facility or activity subject to regulation under Chapter 90.48 RCW or the Federal Clean Water Act. Domestic Wastewater means water carrying human wastes, including kitchen, bath, and laundry wastes from residences, buildings, industrial establishments, or other places, together with such ground water infiltration or surface waters as may be present. Page 41 of 46 Engineered soils The use of soil amendments including, but not limited, to Portland-cement treated base (CTB), cement kiln dust (CKD), or fly ash to achieve certain desirable soil characteristics. Equivalent BMPs means operational, source control, treatment, or innovative BMPs which result in equal or better quality of stormwater discharge to surface water or to ground water than BMPs selected from the SWMM. Erosion means the wearing away of the land surface by running water, wind, ice, or other · geological agents, including such processes as gravitational creep. Erosion and Sediment Control BMPs means BMPs that are intended to prevent erosion and sedimentation, such as preserving natural vegetation, seeding, mulching and matting, plastic covering, filter fonces, sediment traps, and ponds. Erosion and sediment control BMPs are synonymous with stabilization and structural BMPs. Final Stabilization (same as fully stabilized or full stabilization) means the establishment of a permanent vegetative cover, or equivalent permanent stabilization measures (such as riprap, gabions or geotextiles) which prevents erosion. Ground Water means water in a saturated zone or stratum beneath the land surface or a surface water body. lniection well means a "well" that is used for the subsurface emplacement of fluids. (see Well) Jurisdiction means a political unit such as a city, town or county; incorporated for local self- government National Pollutant Discharge Elimination System (NPDES) means the national program for issuing, modifying, revoking and reissuing, terminating, monitoring, and enforcing permits, and imposing and enforcing pretreatment requirements, under sections 307, 402, 318, and 405 of the Federal Clean Water Act, for the discharge of pollutants to surface waters of the state from point sources. These permits are referred to as NPDES permits and, in Washington State, are administered by the Washington Department of Ecology. Notice of Intent (NOi) means the application for, or a request for coverage under this general permit pursuant to WAC 173-226-200. Notice of Termination (NOl) means a request for termination of coverage under this general permit as specified by Special Condition S 10 of this permit. Operator means any party associated with a construction project that meets either of the following two criteria: 1. The party has operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications; or Page42 of46 2. The party has day-to-day operational control of those activities at a project which are necessary to ensure compliance with a SWPPP for the site or other permit conditions ( e.g., they ''\ are authorized to direct workers at a site to carry out activities required by the SWPPP or comply with other permit conditions). Outfall means the location where stonnwater leaves the site. It also includes the location where stormwater is discharged to a surface waterbody within a site, but does not include discharges to on-site stormwater treatment/infiltration devices or storm sewer systems. Permittee means individual or entity that receives notice of coverage under this general permit. pH means a liquid's acidity or alkalinity. A pH of7 is defined as neutral. Large variations above or below this value are considered harmful to most aquatic life. pH Monitoring Period means the time period in which the pH of stormwater runoff from a site shall be tested a minimum of once every seven days to determine if stormwater is above pH 8.5. Point Source means any discernible, confined, and discrete conveyance, including but not limited to, any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, and container from which pollutants are or may be discharged to surface waters of the state. This term does not include return flows from irrigated agriculture. (See Fact Sheet for further explanation.) Pollutant means dredged spoil, solid waste, incinerator residue, filter backwash, sewage, garbage, domestic sewage sludge (biosolids), munitions, chemical wastes, biological materials, radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and industrial, municipal, and agricultural waste. This term does not include sewag~ from vessels within the meaning of section 312 of the CW A, nor does it include dredged or fill material discharged in accordance with a permit issued under section 404 of the CW A. Pollution means contamination or other alteration of the physical, chemical, or biological properties of waters of the state; including change in temperature, taste, color, turbidity, or odor of the waters; or such discharge of any liquid, gaseous, solid, radioactive or other substance into any waters of the state as will or is likely to create a nuisance or render such waters harmful, detrimental or injurious to the public health, safety or welfare; or to domestic, commercial, industrial, agricultural, recreational, or other legitimate beneficial uses; or to livestock, wild animals, birds, fish or other aquatic life. Receiving Water means the waterbody at the point of discharge. If the discharge is to a storm sewer system, either surface or subsurface, the receiving water is the waterbody that the storm sewer system discharges to. Systems designed primarily for other pmposes such as for ground water drainage, redirecting stream natural flows, or for conveyance of irrigation water/return flows that coincidentally convey stormwater are considered the receiving water. Representative means a stormwater or wastewater sample which represents the flow and characteristics of the discharge. Representative samples may be a grab sample, a time- proportionate composite sample, or a flow proportionate sample. Ecology's Construction Stormwater Monitoring Manual provides guidance on representative sampling. Page 43 of 46 Sanitary Sewer means a sewer which is designed to convey domestic wastewater. Sediment means the fragmented material that originates from the weathering and erosion ofrocks or unconsolidated deposits, and is transported by, suspended in, or deposited by water. Sedimentation means the depositing or formation of sediment. Sensitive area means a waterbody, wetland, stream, aquifer recharge area, or channel migration zone. SEPA (State Environmental Policy Act) means the Washington State Law, RCW 43.21C.020, intended to prevent or eliminate damage to the environment. Significant Amount means an amount of a pollutant in a discharge that is amenable to available and reasonable methods of prevention or treatment; or an amount of a pollutant that has a reasonable potential to cause a violation of surface or ground water quality or sediment management standards. Significant Concrete Work means greater than 1000 cubic yards poured concrete or recycled concrete. Significant Contributor of Pollutants means a facility determined by Ecology to be a contributor of a significant amount(s) of a pollutant(s) to waters of the state of Washington. Site means the land or water area where any "facility or activity" is physically located or conducted. Source Control BMPs means physical, structural or mechanical devices or facilities that are intended to prevent pollutants from entering stormwater. A few examples of source control BMPs are erosion control practices, maintenance of stormwater facilities, constructing roofs over storage and working areas, and directing wash water and similar discharges to the sanitary sewer or a dead end sump. Stabilization means the application of appropriate BMPs to prevent the erosion of soils, such as, temporary and permanent seeding, vegetative covers, mulching and matting, plastic covering and sodding. See also the definition of Erosion and Sediment Control BMPs. Storm Drain means any drain which drains directly into a storm sewer system. usually found along roadways or in parking lots. Storm Sewer System means a means a conveyance. or system of conveyances (including roads with drainage systems. municipal streets, catch basins, curbs, gutters, ditches, manmade channels, or storm drains designed or used for collecting or conveying stormwater. This does not include systems which are part of a combined sewer or Publicly Owned Treatment Works (.POTW) as defined at 40 CFR 122.2. Page44 of46 Stormwater means that portion of precipitation that does not naturally percolate into-the ground or evaporate, but flows via overland flow, interflow, pipes, and other features of a stormwater drainage system into a defined surface water body, or a constructed infiltration facility. Stormwater Management Manual (SWMM) or Manual means the technical manual published by Ecology for use by local governments that contain descriptions of and design criteria for BMPs to prevent, control, or treat pollutants in stormwater. Stormwater Pollution Prevention Plan (SWPPP) means a documented plan to implement measures to identify, prevent, and control the contamination of point source discharges of storm water. Surface Waters ofthe State includes lakes, rivers, ponds, streams, inland waters, salt waters, and all other surface waters and water courses within the jurisdiction of the state of Washington. Total Maximum Daily Load (TMDL) means a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet state water quality standards. Percentages of the total maximum daily load are allocated to the various pollutant sources. A TMDL is the sum of the allowable loads of a single pollutant from all contributing point and nonpoint sources. The TMDL calculations shall include a "margin of safety" to ensure that the waterbody can be protected in case there are unforeseen events or unknown sources of the pollutant. The calculation shall also account for seasonable variation in water quality. Treatment BMPs means BMPs that are intended to remove pollutants from stormwater. A few · '1 examples of treatment BMPs are detention ponds, oil/water separators, biofiltration, and constructed wetlands. Transparency means a measurement of water clarity in centimeters (cm), using a 60 cm. transparency tube. The transparency tube is used to estimate the relative clarity or transparency of water by noting the depth at which a black and white Secchi disc becomes visible when water is released from a value in the bottom of the tube. A transparency tube is sometimes referred to . as a "turbidity tube". Turbidity The clarity of water expressed as nephelometric turbidity units (NTU) and measured with a calibrated turbidimeter. Waste Load Allocation (WLA) means the portion of a receiving water's loading capacity that is allocated to one of its existing or future point sources of pollution. WLAs constitute a type of water quality based effluent limitation (40 CFR 130.2(h)). Water Quality means the chemical, physical, and biological characteristics of water, usually with respect to its suitability for a particular purpose. Waters ofthe State includes those waters as defined as "waters of the United States" in 40 CFR Subpart 122.2 within the geographic boundaries of Washington State and ":waters of the state" as Page45 of 46 defined in Chapter 90.48 RCW which include lakes, rivers, ponds, streams, inland waters, underground waters, salt waters, and all other surface waters and water courses within the jurisdiction of the state of Washington. Well means a bored, drilled or driven shaft, or dug hole whose depth is greater than the largest surface dimension. (see Injection Well) Page 46 of 46 AKART BMP CESCL CFR CKD cm CTB CWA DMR EPA ESC NOI NOT NPDES NfU RCW SEPA SWMM SWPPP TMDL UIC USC USEPA WAC WQ WWHM APPENDIX B-ACRONYMS All Known, Available, and Reasonable Methods of Prevention, Control, and Treatment Best Management Practice Certified Erosion and Sediment Control Lead Code of Federal Regulations Cement Kiln Dust Centimeters Cement Treated Base Clean Water Act Discharge Monitoring Report Environmental Protection Agency Erosion and Sediment Control Notice of Intent Notice of Termination National Pollutant Discharge Elimination System Nephelometric Turbidity Unit Revised Code of Washington State Environmental Policy Act Stonnwater Management Manual Stonnwater Pollution Prevention Plan Total Maximum Daily Load Underground Injection Control United States Code United States Environmental Protection Agency Washington Administrative Code Water Quality Western Washington Hydrology Model -') I I i ! I ' Attachment F Notice of Intent Application Form • NOTICE OF INTENT (NOi) APPLICATION FORM Check if applicable: 0 Change/Update Permrt Information !llll~llD~ 11ll! DH 11111 f 11 ti ECOLOGY Construction Stormwater General Pennit D Modification of Permit Coverage Permit #\NAR. __ _ Pleose print or type legibly a/I sections of !his appl/caDon. 1. Operator/Permittee II. Site owner Operator: Person who has operational control over plans and specifications and/or has day-to-day 01>eratlonal control of activities which ensure (If different than Operator/Permittee) compliance with permit conditions. Name Name Mike Kem=ianen Rav Colliver Company Company I)avlev Construction Port Quendall Comoanv c/o Football Northwest LLC Unified Business Identifier (UBI) Unified Business Identifier (UBI) · 601772 879 601660705 Individuals wl/i>out a UBI, enter none or non-ann/ic~ble. Individuals without a UBI, enter none ornon-ar.nl/cable. Mainng Address Mailing Address 8005 SE 28'" Slreet 505 Fifth Avenue, Suite 900 PO Box (Optional) • PO Box (Optional) 9004 City \ State I Zip City I State I Zi Mercer Island WA 98040 Seatlla WA . 9f104 Phone No. Business 206-621-8B84 Ext Phone No. Business 206-342-2000 Ext Cell Cell E-mail (Optional) E-mail (Optional) Fax No. (Ontionall Fax No. 10"'1onall llf. On-site Contact Person JV. Billlng Information Same as Certlflecl Erosion & Sediment Control Leacl Name Name John Weller Dan Suver Title Title Proiect Suoerintendent Construction Manaaer Company Company Bav!ev Conslrucilon Bavlev Construction Mailing Address Maili.ng Address 8005 SE 28" Street 8005 s. E. zs'" street PO Box (Optional) PO Box (Optional) 9004 P.O. Box 9004 City State Zip City State Zip Mercer Island WA 98040 Mercer Island WA 98040-9004 Phone No. Business 206-621-8884 Ext Phone No. Business 206-342-2397 Ext. Cell Cell · E-mail (Optional) E-mail (Optional) Fax No. /Ootional) Fax No. !Ootional) ECY 020-85 (rev 12/05) Page 1 V. Site Location VI. Site lnformaUon Stte/Project Name · · Total.size of site: 19.5 acres Saahawks Headnuarters and Trainlna Facilitv · Street Address or Location Descrtptlon (If the project or Total area of son disturbance: 19 acres (Enter the site lacks a street address, Ind/cote the general location estimated total area to be disturbed during the life of the of the site (e.g., lntemoot/On of Highways 61 and 34)) 5015 Lake Washington Blvd N project, /nciudlng grubbing, excavation, grarl/ng, uHll/ies and irdrastrJJcture installation. Nole: 1 acre = 43,560 ft' Type of project (Road, Utilities, subdivision, private home, commercial, etc.) How many cubic yards of ooncrete will be poured? 7,500 yi:r' Stte cap~lng for environmental protection How many cubic yards of. recycled concrete wm be used? NII yd' . ' How many cubic yards of engineered soils (CTB, CKD, etc.) wll be used? 33,000 yd3 , City (or nearest city) Zip Estimated project start-up date: November 3, 2006 Renlon 98056 County King County Estimated projeet compleUon date: June 2008 Record the latitude and longitude of the site, • Record the laolvde and longitude of main entrance to the slfe. For projools wll/10ut a main entrance (pipe/Ines, roads, ,etc.), record approximate center of slle. degrees, minutes, seconds degrees, minutes, seconds Latitude 47• 32'. 11· N longitude 122• 11' 46' w • • For assistance with latitude and longitude refer to: http://cfpubt.epa.gov/npdes/stom1waterl/atlong.cfm or www.topozone.com or http:/twww.epa.govltrl/reportlsitlng_tooUindex.htm. VII. DlschargeJRecelvlng Water Information Dlscharg~: Does your construction site's stonn water .discharge to: X A stormwater lnfiltra!lon structure with discharge to ground water? (e.g .. infiltration pond, dry well, regional detention basin, etc.) Infiltration will be Incidental during co!leotlon ofstonnwaterfor discharge to sanitary sewer i,1 Directly or lndirectiy to a surface water body/waler bodies (e.g., via storm drain system, roadside ditch, pipe, etc.)? Provide locations below or attach separate sheet, tf necessary. Does your project Include dewatering? D Yes X No Dewatering plans and discharge locations must Ix, inoluded In the Slonnwatar Po/Jut/on Prevention Plan. Soma large constroctton pro/eels (subdfvlsions. roads, pipelines, etr;,./ may disaharge to several water bodies. If tile map does not provide a name of a creek or tributary, use a format such as •unnamad tributary to Bull Run Creek. Plaase indicate the name of the receiving water body. (Attach a sepamte /ist for mullipie water bodies.) Are any of the water bodies designated as water quality Impaired?· (I.e., is the water body 303(d) listed or have a TMDL for turbidity. fine sedbnenl phosphorus or Pl:!.\?. D Yes X No • For informaffon on impaired water bodies, h"":/twww.--•.wa.nov/r>mnram•AvNlstormwatertconstructionlconst maos.html ECY 020·65 {rev 12/05) Page2 Location of Discharge to Receiving Water Enter the water body name, latitude/longitude• of the point(s) where the site discharges to the receiving water body (enter all locations). Latitude Lon!litucle ~eclil'lvlng Water Body tiegrees, mlnutas1 seconds degreesi minutes, se:eoncis r a(I.L f ,.);:.( i , : ; ~;,,,r, ~ 1-0 ?,:)..• (0 N I J.2 ·lt·S}w u 0 N • w • N . w . N 0 ' w . N • w • For assisff>nca w11h /aUtude and /ong//ude refer to: http:ffcfpub1.epa.govfnpdeslstormwaterf/at!ong.cfm (or www.topozone.com) or http://www.epa.gov/trVreportlsiting_tooV/ndex.htm VIII. StorotWeter Pollution Prevention Plan (SWPPPI Has a SWPPP baen developed that Includes a narrative and drawings? D Yes X No If NO, the SWPPP must be completed prior to sta,t of construction. IX. State Environmental Pollcv Act fSEPAl SEPA requirements must be complied with prtor to submittal of the stormwater permit application. If exempt, provide documentation that justifies SEPA exemption. Has SEPA been complied v.ith? X Yes D No D Exempt Date of SEPA compfiance April 5, 2000 X. Publlc Notice Toe public notice must be published at least once each week for two consecutive weeks, in a single newspaper of general circulation In the county in which the construction Is to take place. See the NOi instructions for the public notice language requirements. Penmit coverage will not be granted sooner than 31 days afier the date of the second public notice. Note; Submit the NOi and public notice to Ecology before the dete of the first public notice. You may fax the NOi and publlo notice to (360) 407-6426. You can also attach a copy of the public notice to tt1ls form. Provide the exact dates (mm/dd/yy) that the first and second public notices wiH appe9r in the newspaper. Dale of the firs! notice 09/25/2006 Date of second notice 10/02/2006 Name of the newspaper that will run the public notiC"..s: King county Journal Geology does not require the Sllbmittal of the affidavit or publication. Complete the abova public notice information or provide a copy of the notice to be published. ECY D20-S5 (rev 12/05) Page 3 PUBLIC NOTICE TEMPLATE __ (Name ofoperatorlpermitlee) __ (Address of owner or·% representative) is seeking coverage under the Washington Department of Ecology's· NPDES General Penni! for Stormwater Discharges Associated with Construction Activities. The proposed __ (total acres) project known as __ (project name) is located at __ (straet address, intersection, crossroads, or other descriptive site '!ocation) in __ (name of nearast city). Approximately __ (numberof disturbed acres) will be disturbed for construction of __ /project type). (List all construction activity, e.g., clearing, grading, stockpiling (approx yd'. and location). importing/exporting materials (yd'). demolition, grading, stormwater facilities, roads, utilities, number buildings/homes and type. sidewalks, landscaping.) Stormwater will be __ (Brief description of how the stom1water will be cleaned and controlled} prior to discharging __ (Describe the direction of the storm water nows; include distance to receiving waters. List waUands, unnamed and named raceiving waters and storm drains; clearly identify buffer location and widths used to protect sensitiVe water bodies.) Any persons desiring to present their views to the Department of Ecology concerning this application may notify Ecology in writing within 30 days from the last date of publication of this notice. Comments may be submitted to: Washington Department of Ecology Water Quality Program Stormwater Unit -Construction PO Box 47696 Olympia, WA 98504-7696 XI. Certification of Permittees "I certify undel' penalty of law that this document and all attachJnents were prepared under-my direction or supervision in accordance with a system design~ to assure that qualified personnel properly gather and evaluate the information submitted. B ed on my Inquiry of the person or persons who manage the system or those directly responsible for gathering the rformation. the information submitted is, to the best of my knowledge and belief. true, accurate, and co lete. am aware that there are significant penalties for submitting false information, ii,cluding the poss· fui id imprisonment for knowing violati01,s. " • Federal regulati s require this application to be signed as follows: Vq President of Estimating Ocfober 4 2006 Dato A For a corporation, by a principal executive officer of at least the level of vice president; B. For a partnership or sole proprietorship, by a general partner or the proprietor, respectively; or C. For a municipality, state, federal, or other public facility, by either a principal executive officer or ranking elected official. Please sign and raturn this document to the following address: If you have any questions, please call: Washington Department of Ecology Water Quality Program Construction Stormwater Unit PO Box 47696 Olympia, WA 98504-7696 a (360) 407-7451 Charles Gilman for city of Seattle or counties: Kitsap, Pierce. Thurs/Dn a (360) 407-7229 Tammie McClure for counties: King, Island, San Juan a (360) 407-6437 Linda Matlock for counties: Whatcom, Skagit, Snohomish, Ferry, Stevens, Pend Orallle, Lincoln, Spokane. Grant. Adams, Whitman, Franklin, Walla Walla. Columbia, Garneld, Asotin a (360) 407-6858 Joyce Smith for counties: Okanogan, Chelan, Douglas, Kittitas, Yakima, Benton, Klickitat, Skamania, Clark, Cowlitz, Wahkiakum, Lewis, Pacific, Grays Harbor, Mason, Jefferson. Clallam If you require thfs document in 811 alt9metlve format, please contact the Water Quality Program at (360)-407-6401. If you are a person withe speech or hearing impairment, cafJ 711 for relay service or 1-800-833-6388 for TTY. Ecology is en Equal Opportunity Agency. ECY 020-as (rev 12105) Page 4 MITIGATED DETERMINATION OF NONSIGNIFICANCE -J.H. Baxter South Property Proposed Cleanup Action Plan Description of proposal: The proposed cleanup action will be conducted under the Model Toxics Control Act (MTCA) Chapter 173-340 WAC with a Prospective Purchaser Agreement Consent Decree_ between Port Quendall Company (PQC), the prospective purchaser, and Ecology. The Consent Decree is the legal agreement to conduct the cleanup and will resolve the potential liability of PQC for known contamination al the South Baxter Site. The cleanup includes the following: • DNAPL removal from source areas prior to soil stabilization {BAX-14); • In-situ soil srabilization of NAPL-impacted soil near the butt tanks and Baxter· Lagoon based on an action level of 1,000 to 5,000 mg/kg TPAH to remove a long- lenn source of groundwater impacts; • Excavation of LNAPL-impacted soil near the fonner tank farm based on an action level of 1,000 to 5,000 mg/kg TPAH followed by thennal treatment or off-site disposal of soil to provide a reduction in contaminant volume and to remove a long- tenn source of groundwater impacts; • Removal and incineration of Listed Hazardous Wastes from Baxter Lagoon; • Capping of residual soil impacts to prevent direct contact by humans and institutional controls to ensure cap integrity into the future; + Removal and thennal treatment or off-site disposal of impacted sediment above the action level of 100 mg/kg TP AH from Baxter Cove to prevent exposure of aquatic organisms; + Dredging of the Gray Zone ifbioassay testing indicates remedial action is required; t Restoration and enhancement of wetlands and shoreline; + Monitoring of groundwater and implementation ofa compliance monitoring program to ensure that groundwater discharging to Lake Washington is protective; and • Implementation of institutional controls to prevent future groundwater extraction. Mitigation is also included for this cleanup as follows: Wildlife habitat will be expanded and enhanced in a 50-foot buffer zone along the shoreline, in which plants and habitat features will be placed. The werlands impacts (Baxter Cove and Baxter Lagoon) will be mitigated by replacement at a I to 1.5 ratio (removed to restored). In addition to restoring Baxter Cove, an additional wetlands area north of the cove will be constructed. A 100- SEPA -Mirigated Determination of NonSignificance (DNS) J.H. BaxlerSoutlr Property Proposed Cleanup Action Pinn April 5, 2000 • Page 2 of 2 foot buffer zone will be placed along the shoreline south of Baxter Cove. In addition, in-water work will be performed at a time during the year to minimize impacts to migrating species. Proponent: Port Quendall Company Location of proposal, including street address, if anv: J. H. Baxter South Property, 5015 Lake Washington Boulevard North, Renton, Washington. Lead agency: Washington State Department of Ecology. The lead agency for this proposal has detem1ined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.2IC.030(2)(c). This decision was made after review of a completed environmental checklist and other infom1ation on file with the lead agency. This infonnation is available to the public on request. · _ There is no comment period for this DNS. _ This DNS is issued after using the optional DNS process in WAC 197-11-355. There is no further comment period on the DNS. _x_ This DNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 30 days from the date below. Comments must be submitted by May 8, 2000. Responsible official: Gail Colburn. Position/title phone: Site Manager, Toxics Cleanup Program {425) 649-7058. Address: Washington Department of Ecology, 3190 -160'' Avenue S.E., Bellevue, Washington 98008-5452. Send comments on the Cleanup Action to Gail Colburn, Site Manager, Washington Department of Ecology, 3190 -I 60~ Avenue S.E., Bellevue, Washington 98008-5452. For more Information, contact Susan Lee, Public Involvement Specialist, Washington Department of Ecology, 3190 · !60• Avenue S.E., Bellevue, Washington 98008-5452. This infomrntion is available for special accommodation needs or language translation assistance. c~ll 425-649-7259 (voice) or 425-649-4259 (TDD). DETERMINATION OF NONSIGNIFICANCE J.H. Baxter North Property Proposed Cleanup Action Plan Description of proposal: The proposed cleanup action will be conducted under the Model Toxics Control Act (MTCA) Chapter 173-340 WAC with a Prospective Purchaser Agreement Consent Decree between Port Quendall Company (PQC), the prospective purchaser, and Ecology. The Consent Decree is the legal agreement to conduct lhe cleanup and will resolve the potential liability of PQC for known contamination at the North Baxter Site. The cleanup includes capping residual soil ii11pacts with a three-foot crushed rock/soil cover or development features to prevent direct contact with soil exceeding MTCA Method B cleanup levels for direct contact. Institutional controls, including a restrictive covenan~ wi II be implemented to ensure cap integrity and provide for periodic inspection and maintenance of the cap. Proponent: Port Quendall Company Location of proposal, including street address. if anv: J. H. Baxter North Property, 5015 Lake Washington Boulevard North, Renton, Washington. Lead agencv: Washington State Department of Ecology. The lead agency for this proposal has detennined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.2!C.030(2)(c). This decision was made after review of a completed environmental checklist and other infonnation on file with the lead agency. This infonnation is available to the public on request. _ There is no comment period for this DNS. _ This DNS is issued after using U1e optional DNS process in WAC 197-11-355. There is no further comment period on the DNS . ...X.. This DNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 30 days from the date below. Comments must be submitted by May 8, 2000. Responsible official: Gail Colburn. Position/title phone: Site Manager, Toxics Cleanup Program (425) 649-7058. Address: Washington Department of Ecology, 3190. 160"' Avenue S.E., Bellevue, Washington 98008-5452. SEPA -Determination of Non-Significance (DNS) J.H. Baxter North Property Proposed Cleanup Action Plan Apn/ 5, 2000 Page2of2 Date: Wednesday" P,.priJ 5, 2000. 1 ; I J / ,j ·, i I;,; (I n. (),•. Si2nature: ,>/'.,;,;, : , !_( {<.Y Jj,.),!v Send comments on the Cleanup Action to Gail Colburn, Site Manager. Washington Deparbnent of Ecology, 3190 -160'' Avenue S.E., Bellevue, Washington 98008-5452. For more information, contact Susan Lee, Public Involvement Specialist, Washington Department of Ecology, 3190 -1 GO" Avenue S.E:, Bellevue, Washington 98008-5452. This infonna!ion i-s available for special accommodatfon needs or language translntion assistance, call 425-649-7259 (voice) or 425-649-4259 (TDD). Bayley Construction at 8005 SE 28th St, Mercer Island, Washington 98040 is seeking coverage under the Washington Department of Ecology's NPDES General Permit for Stormwater Discharges Associated with Construction Activities. The proposed 20-acre project, known as Seahawks Headquarters and Training Facility, is located at 5015 Lake Washington Boulevard North in Renton. Approximately 19 acres will be disturbed for site capping for environmental protection as required under Consent Decrees with the Department of Ecology. Construction activities will consist of: I) demolition of a building and some asphalt pavement; 2) site clearing and grading; 3) importing of 44,000 yd3 of clean soil; 4) exporting 24,000 yd3 of unsuitable soil and woodwaste material; 5) geotechnical improvements using drilled-shaft pilings and cement treated soil; 6) construction of natural and artificial turf fields; 7) placement of asphalt parking areas; 8) installation of a structural concrete slab; and 9) utility installation. Stormwater will be collected in a basin or temporary storage tanks for settling and testing, as necessary, prior to discharging to the sanitary sewer. Any discharge to surface or ground water would be incidental to storm water collection. Storm water flow is generally toward the adjacent Lake Washington. Environmental capping of contaminated soil is required to within 25 feet of the Lake. A wetland mitigation area is present on the site and an urmamed drainage of the Gypsy subbasin crosses the site but does not collect stormwater from the site. A new culvert for this drainage is proposed to be installed as part of this project. Riparian plantings for habitat enhancement will be added to the Lake Washington shoreline. Any persons desiring to present their views to the Department of Ecology concerning this application may notify Ecology in writing within 30 days from the last date of publication of this notice. Comments may be submitted to: Washington Department of Ecology Water Quality Program Stormwater Unit -Construction POBox47696 Olympia, WA 98504-7696 Appendix D City of Renton Substantive Requirement Letter JUN-13-2002 17:31 -~" Jcs.se To.nner, Mayor May 30, 2002 Ms. Gail Colbum CI TY OF RENTON Washington Department of Ecology Northwest Regional Office · 3190 160"' Ave, SE . Bellevue, WA 98008-5452 425 430 7300 P.02/02 CITY OF RENTON Planning/BuildinglPublicWorla Department Gregg Zimmerman P,E~ Admlnlotnlor SUBJJ:CT: BAX',I'ER CLEAN•UP ACTION PLAN -CITY OF RENTOJ'll SUBSTANTIVE REQtlIREMENTS Dear Ms.' Colburn; We have reviewed trurEngineerillg Design Report for the J.H. Buter South Property, prepared by RETEC Group, Inc: (May 28, 2002) for remediation of site contamination. The cleanup action is being accomplished under~ Mod~ Toxics Contt:pl Act, and as such, Washington Department of Ecology preempts local permit1luthority. Howe~, per RCW 70 .105D .090 the remedial action must comply with the substanti~ pro'lisions of any laws requiring or authorizing local government permits or, approvals. · · The proposal to remediate contamination on the ·B8"ter ,property meets substantive permit requirements of the City of Renton includlng Shoreline~bsta!ltial Development Permit (RMC 4-9-190), Special Pennit for Orade andllill (Grading, Excavation and Mining Regulations (RMC 4-4-060), Routine Vegetation Management Permit (Tree Cutting and Land Clearing Regulations (RMC4-4-130). .,. The City has been kept apprised of the status of the design of the cleanup action, proposed mitigation and enhancement; and we ·have commented !Iii necessary during the collaborative process. Should you have any quesrions regardinjphis correspondence, please contact Jenoifcr Henning, Principal Planner, at (425) 430-7286 .. Sincerely, NdWdt[ Neil Watts, Director Development Services Division cc: Jennifer Hcmtmg: Chuck Wolfe, POSl<t Pq,p«, 8' She!elman --11n:11.w'"_"m1a11101f.l1Jrll:~'"'1'"~s"""S..,~s.,.atwuethevo1t~Dt:md:1!~,.tlll~n~ir~11JOlfl•Olf1!10:t..;;;m~nr.,1~.,W:11,';rh-in_gt_o_n_9_8_05-5----'----~ TnTAI P.l'I::> JUN---13-2002 17:31 CITY OF RENTON TO: Phone: Citv of Renton P/B/PW Department Development Services Division 1055 South Grady Way Renton, WA 98055 Chuck Wolfe Foster Pepper & Shefelman (206) 447-2901 425 430 7300 P.01/02 Date: 06/13/02 FROM: Jennifer Henning Phone: {425) 430-7286 Fax Phone: (206) 749-2035 Fax Phone: (425) 430-7300 I SUBJECT: Baxter Letter to DOE REMARKS: 0 Original to bamalted 0 Urgent I Number of pages lnr:luding cover sheet 2 0 Reply ASAP O Please C For your Comment review AIIJ.A.O OP Ttl1 CUlt.'fl Appendix E Wetland Documents Wetland Mitigation Plan Drawings (AESI, July 2001) J. H. Baxter Property Mitigation Analysis Memorandum (AESI, February 17, 2000) MITIGATION ANALYSIS MEMORANDUM ·oUENDALL AND BAXTER PROPERTIES RENTON, WASHINGTON CORPORATE OfflCE 911 nl1h Avenue, Soile 100 Kirkland, Washington 98033 1425) s27-no1 FAX 1425) 827-5424 BAINBRIDGE ISlAND OFFICE 179 Madron. lone Noni, lloinbridge l,lond, WA 98110 {206) 780-9370 FAX 1206) 780-9438 PREPARED FOR Vulcan Northwest City of Renton PROJECT NO. KB99142A February 17, 2000 PORT QUENDALL MITIGATION ANALYSIS MEMORANDUM Prepared for: Vulcan Northwest 110 1101h Avenue NE, Fifth Floor Bellevue, WA 98004 and The City of Renton 1055 South Grady Way, Sixth Floor Renton, WA 98055 Prepared by: Associated Earth Sciences, Inc. 911 Fifth Avenue, Suite 100 Kirkland, Washington 98033 February 17, 2000 Project No. KB99142A Quendall mui Bax1er Properties Mitigation Analysis Memorandum TABLE OF CONTENTS 1.0 INTRODUCTION ................................................................................................................... I I.I Objectives ........................................................................................... 1 1.2 Disclaimer. .......................................................................................... I 2.0 DESCRIPTION OF AFFECTED RESOURCES .................................................................... 2 2.1 Water Quality .............................................................................. · ......... 2 2.1.1 South Lake Washington .................................................................. 2 2.1.2 Gypsy Subbasin Drainage ................................................................ 9 2.2 Plants and Animals .............................................................................. 12 2.3 Fisheries Affected Environment ............................................................... 16 2.3.1 Introduction ............................................................................... 16 2.3.2 Lake Washington Biology ............................................................. 17 Pelagic Species ................. : .......... , ................................................. 17 Benthic Species ............................................................................. 21 2.3.3 Lake Washington Shoreline ........................................................... 21 Survey Methodology ...................................................................... 21 On-Site Habitat and Valuation ........................................................... 21 . Off-Site Habitat ............................................................................ 27 2.3.4 Lake Washington Open Water ........................................................ 29 Benthic ....................................................................................... 29 Water Column .............................................................................. 30 Surface ....................................................................................... 30 2.3.5 Habitat Valuation ........................................................................ 30 2.4 Recreational.._ .................................................................................... 31 2.5 Cultural ............................................................................................ 31 2.6 Economic .......................................................................................... 31 3.0 IMPACTS .............................................................................................................................. 32 3.1 Plants and Animals .............................................................................. 32 3 .1.1 Disturbance to Shoreline ............................................................... 32 3 .1. 2 Dredge Offshore Polycyclic Aromatic Hydrocarbons (P AH) ................... 32 3.1.3 In-Water One-Foot Sediment Cap .................................................... 37 3.1.4 Dredge Offshore Areas with Greater Than 50 Percent Wood Chips ........... 37 3 .1.5 Upland Soil Excavation and Capping ................................................ 37 3.2 Fisheries Impacts ................................................................................. 37 3 .2.1 Shoreline Disturbance .................................................................. 37 3.2.2 Dredge Offshore (PAH) ................................................................ 38 3.2.3 Dredge Offshore (Wood Chips) ....................................................... 38 3. 2.4 Upland Soil Excavation and Capping ................................................. 40 4.0 MITIGATION ........................................................................................................................ 41 4.1 Plants and Animals .............................................................................. 43 4.1.1 Disturbance to Quendall Shoreline and Loss of Wetland C ...................... 43 4.1.2 Excavation of Baxter Cove (Wetland E) and Loss of Wetland D ............... 49 February 17, 2000 ASSOCIATED EA.Rm SCIENCES, INC. ACK!jMd-KB99U2A51 · W·D:\ld\2-00 . W2K Page i Quendall and Baxter Properties Mitigation Analysis Memorandum 4.1.3 Dredge Offshore Areas with Greater Than 50 Percent Wood Chips ........... 49 4.1.4 Dredge Offshore PAH Areas ........................................................... 50 4.1.5 Upland Soil and Excavation and Capping ........................................... 50 4.2 Fisheries Mitigation ............................................................................. 50 4.2.1 In-Water Work Timing .................................................................. 50 4.2.2 Shoreline Disturbance .................................................................. 51 4.2.3 Dredge Offshore (PAH and Wood Chips) ............................... : .......... 51 4.2.4 Upland Soil Excavation and Capping ................................................ 51 4.3 Water Quality ..................................................................................... 53 4.4 Mitigation Implementation Schedule ......................................................... 53 4.4.1 Baxter Property ........................................................................... 53 4.4.2 Quendall Property ............................................................ : ........... 53 4.5 Monitoring and Contingency ................................................................... 55 4.5.1 Performance Standards .................................................................. 55 4.5.2 Maintenance ............................................................................... 56 4.5.3 Monitoring ......................................................... .' ....................... 56 4.5.4 Monitoring Schedule ..................................................................... 57 4.5.5 Monitoring Reporting ................................................................... 57 4.5.6 Contingency Plans ....................................................................... 58 5.0 REFERENCES ...................................................................................................................... 59 LIST OF FIGURES ........................................................................................................................ ii Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 2-7. Figure 3-1. Figure 3-2. Figure 3-3. Figure 4-1. Figure 4-2. Figure 4-3. Figure4-4. LIST OF FIGURES Metro Water Quality Sampling Stations in Lake Washington ............................... 3 Wetlands and Shoreline Vegetation ...................................................................... 13 Aerial Overview of Port Quendall Remediation Site ........................................... 14 1994 beach seining results at Kennydale Park. ..................................................... 18 Wetlands and Shoreline Structure ......................................................................... 24 Wetlands and Shoreline Substrate and Depth ....................................................... 25 Lake Washington Shoreline Composition along a 14-Mile Reach ofLakeshore on Both Sides of Quendall and Baxter in September 1995 .............................................................. 28 Wetlands and Shoreline Vegetation with Remediation Overlay .......................... 34 Wetlands and Shoreline Structure with Remediation Overlay ............................. 35 Wetlands and Shoreline Substrate and Depth with Remediation Overlay ........... 36 Conceptual Shoreline and Wetland Mitigation Plan ............................................. 42 Shoreline Enhancement Concept (shrub-dominated cross-section) ..................... 46 Shoreline Enhancement Concept (tree-dominated cross-section) ........................ 47 Conceptual Wetland Design for Lake Washington Shoreline .............................. 48 LIST OF TABLES February 17. 2(XX) ASSOCIATED EARTH SCIENCES, INC. ACK/jhlld · K899U2A'7. LD-D.-\ldt.2.00 • W2K Page ii Table 2-1. Table 2-2. Table 2-3. Table 2-4. Table 2-5. Table 2-6. Table 2-7. Table 2-8. Table 2-9. Table 2-10. Table 2-11. Table 3-1. Table 3-2. Table 3-3. Table 4-1. Table 4-2. Table 4-3. Quendall and Baxter Properties Mitigation Analysis Memora,uium Nearshore Lake Washington Total Metals Concentrations for a Water Sample Collected South of the Gypsy Sub basin Culvert Outfall on the Baxter Parcel... ......................................... 4 Lake Washington Surface Water Quality near the Port Quendall Property .................................................................. , ........................ 5 Lake Washington Water Quality Data Collected neat the May Creek Mouth ..................................................................................... 6 Water Quality Measured in the Lower Gypsy Subbasin Drainage Outfall to Lake Washington .................................................................. 10 Results of Metals Screen for Lower Gypsy Subbasin Drainage at the Culvert Outlet to Lake Washington ............................................. 11 Wetlands to be Dredged or Filled by the Port Quendall Remediation Actions ..................................................................... 15 Fish Species in Lake Washington ......................................................................... I 9 Benthic Biota Present in Lake Washington .......................................................... 22 Lake Washington shoreline characteristics for the Quendall and Baxter Properties ............................................................................ 26 Comparison of Shoreline Conditions within the Remediation Area and the Surrounding Shoreline ............................................... 27 Comparison of Overwater Pier Coverage within the Remediation Area (1997) and the Surrounding Shoreline (1989) ........................ 28 Shoreline Vegetation Disturbance Resulting from Upland Excavation and/or Capping ...................................................................... 32 Impacts to Wetlands to be Dredged or Filled by the Quendall and Baxter Remediation Actions (Refer to Figure 3-1) ........................ 33 Valuation of Physical Shoreline Characteristics as Fish Habitat and Mitigated Condition Following Remediation (3,130 feet surveyed April 11, 1997) .................................................................... 39 Plant Species Proposed for Planting witl1in the Wetland and Shoreline Buffers ............................................................................. 45 Mitigated Lake Washington Shoreline Characteristics (3,130 ft. surveyed April 11 l 997) ........................................................................ 52 Mitigation of Short-Term Impacts Related to Site Cleanup ................................. 54 ASSOCIATED EARm SCIENCES, INC. Page iii February 17, 2000 ACK.ljlllld · KB99U2AS7 • LD--D:Wll.00. W2K Quendall and Baxter Propenies MitigaJion Analysis Memorandum 1.0 INTRODUCTION 1.1 Objectives Mitigation analysis has been prepared for remediation of the Quendall Terminals (Quendall) and Baxter sites under Prospective Purchases Consent Decrees as provided for under the Model Toxics Control Act (MTCA). The remediation areas include the Quendall and Baxter properties, as well as areas offshore of the Quendall property. The Washington State Department of Natural Resources (DNR) is a landowner offshore of the Quendall and Baxter properties. Use authorization will be obtained from DNR prior to remediation activities on its property. Under a Consent Decree in conformance with MTCA (RCW 70.105D), remediation actions are exempt from procedural requirements of permits under RCW Chapters 70.94 [Air], 70.95 [Solid Waste], 70.105 [Ha.zardous Waste], 75.20 [Hydraulic Permit], 90.48 [Water Quality!, and 90.58 [Shorelands], and the· procedural requirements of any laws requiring or authorizing local government permits or approvals for the remedial action (RCW 70.105D .090). For the mitigation action, this would include such procedural requirements as Hydraulic Permit Approval (HPA), National Pollutant Discharge Elimination System (NPDES) permit issuance, and City of Renton wetland mitigation requirements and shorelands permits under the Renton zoning regulations. The Washington Department of Ecology (Ecology) will ensure compliance with the substantive provisions of these laws and regulations through issuance of the Consent Decrees for the Quendall and Baxter remediation projects, and will make the final decision regarding which substantive provisions are applicable. The substantive requirements will be incorporated into the Consent Decrees as Ecology deems appropriate, or into other remedial action documents. The Consent Decrees would provide assurance that the mitigation proposed in this document will be performed. The Consent Decrees would also require that the mitigation installation, oversight, and monitoring contractor be identified in advance to Ecology. In this document, references to City of Renton wetland buffer requirements, buffer widths, and shoreline setbacks are made for the purpose of comparing substantive elements of the proposed remediation under MTCA with the local procedural requirements for the Quendall and Baxter properties. Resources potentially impacted by the site remediation plans are described in Section 2. 0, and impacts to those resources from remediation are described in Section 3.0. Conceptual mitigation plans are provided in Section 4.0. 1.2 Disclaimer The City of Renton has an interest in the Quendall property, and Vulcan Northwest, Inc. has an interest in the Baxter property. The DNR is a landowner of record for areas offshore of both properties that would be affected by some of the proposed remediation work. The City of Renton, and Vulcan Northwest, Inc. are submitting this document with the understanding that no independent liabilities shall be assumed by any party under the Model Toxics Control Act (MTCA) or any comparable federal or state environmental laws should any party elect not to complete purchase of the subject properties; nor shall the current owners of the Quendall or Baxter project areas be in any way obligated to undertake any mitigation approach or recommendation contained herein. February 17, 2000 ASSOCIATED EAR1ll SCIENCES, INC. ACKJjMd -KB99142.4$7 • UJ..D.-WlZ-fJO • W2K Page 1 Quendall and Baxter Properties Mitigation Analysis Memorandum 2.0 · DESCRIPTION OF AFFECTED RESOURCES 2.1 Water Quality Lake Washington is the largest lake in King County with a drainage area of 4 72 square miles and an area of 21,500 acres. The lake has a volume of2.35 million acre-feet, a mean depth of 108 feet, and a maximum depth of 214 feet. The Lake Washington watershed is urban, and approximately 63 percent of its area was developed by 1989 (Metro 1989). The basin is much more urbanized today. The main inflows to the lake are the Cedar River in the south end (57 % ) and the Sammamish River in the north end (27%). The Cedar River contributes 25 percent and the Sammamish River contributes 41 percent of the phosphorus load to the lake, respectively. The lake outlet is the ship canal, which flows through Portage Bay and Lake Union to Puget Sound near Shilshole. Metro has established numerous water quality monitoring stations for nutrients and conventional parameters throughout Lake Washington (Figure 2-1). Most of the historic water quality data available for Lake Washington are from 5 nearshore stations established in Juanita Bay, Yarrow Bay, Newport, Meydenbauer Bay and Kenmore, which are all north of the remediation site. However, additional nearshore and offshore stations were added to the monitoring effort beginning in 1992, which included three near the Port Quendall remediation site. These three lake stations are located at the mouth of May Creek (stations 0839 [shallow) and 0840 [deep]), and near Renton (station 0831). · Lake Washington is listed as water quality limited for sediment under the 1972 Clean Water Act (Section 303(d) Segment No. 08-9350). Six sediment bioassay srudies are cited as the basis for the listing. Three of the six bioassays were conducted on sediment collected near the Port Quendall site (Norton 1991; Norton 1992; Bennett and Cubbage 1992). Lake Washington (Waterbody Segment Number WA-08-9350) is listed as impaired for wildlife habitat as a result of industrial point source pollution. Contamination of the Quendall and Baxter properties, and cleanup standards agreed under Consent Decrees for each, are not the subject of this water quality section. Conventional water quality parameters are described, mainly from existing literature, to allow evaluation of habitat suitability following remediation. 2 .1.1 South Lake Washington Beak Consultants Incorporated collected one on-site shoreline water sample on March 21, 1997 from Lake Washington approximately 200 feet south of the lower Gypsy Subbasin Drainage outfall to augment the Metro data, which lacked information on heavy metals. This sample was analyzed for metals (e.g., cadmium, copper, lead, and zinc) and hardness (Table 2-1). Cadmium and zinc exceeded the acute State water quality standards, and lead exceeded the chronic water quality standard. The exceedences were based on State standards (WAC 173-201A) for metals at the ambient hardness of 32 mg CaCO/L. February 17. 2000 ACK/jh//d-KB99J41.A57-LD-D:\ld\2-00 -W1K ASSOCIATED EARTH SCIENCES, INC. Page 2 Lake Seattle ---May Creek LEGEND ~ [{~~ H;storic water quality stations ..&. ,;. ~ ·,··========Sha:l:low=sta:lio=n==============::;:========N=OR=TH=== Deep station NO SCALE METRO WATER QUALITY SAMPLING STATIONS IN LAKE WASHINGTON QUENDALLAHD BAXTER PROPERTIES . REMEDIATION MITIGATION PROJECT RENTON, WASHINGTON FIGURE2-1 DATE 9124199 PROJ. NO. KB99142A Table 2-1. Cadmium: Acute Chronic Copper: Acute Chronic Lead: Acule Chronic Zinc: Acute Chronic Quenda/1 and Baxter Properties Mitigation Analysis Memorandum Nearshore Lake Washington Total Metals Concentrations for a Water Sample Collected South of the Gypsy Subbasin Culvert Outfall on the Baxter Parcel. 0.0010 0.0009 NO 0.0004 NO 0.002 0.0052 YES 0.0038 YES 0.001 0.0.132 YES 0.0005 NO 0.054 0.0397 NO 0.0360 NO Water sample collected from Baxter parcel shoreline by Beak Consultants on March 21, 1997. Metals standards shown for hardness of 32 mg/Las CaCO, in the sample. Metro has monitored two Lake Washington stations near the mouth of May Creek and an offshore station near Kennydale Park in Renton (Table 2-2). The sampling frequency varied, but was from approximately 1992 to the present, with samples collected bimonthly. Parameters monitored were temperature, D.O., pH, conductivity, transparency, turbidity, alkalinity, nitrate+nitrite-nitrogen, ammonia nitrogen, total nitrogen, orthophosphate, total phosphate, chlorophyll-a, phaeophytin, fecal coliform, and enterococcus. The lake water quality near the Quendall and Baxter sites can be described as moderate for a mesotrophic urban lake. The remediation actions are expected to improve sediment quality and decrease risk of exposure of aquatic organisms to contaminants originating on the two sites. Water quality for the whole lake is rated by Metro as good, except for algal blooms in periods of warm weather. Average transparency for the south lake stations was 3.8 m. Fecal coliforms were high at the May Creek nearshore station (average of 128 MPN), as was chlorophyll-a (9.6 mg/m3 in 1996). Nutrients were low at the Kennydale Park and May Creek lake stations, with the average nitrate + nitrate nitrogen value less than 0.25 mg/Land the average orthophosphate was less than 0.010 mg/L. Transparency, total phosphorus, and chlorophyll-a trends for METRO station 0839 during water years 1992 through 1994 indicate decreased transparency, slightly increased phosphorus, and slightly decreased chlorophyll-a (Table 2-3). Chlorophyll-a peaked annually from 1992 through 1994 in April or May offshore of May Creek, which may be reflective of nutrient loading from the February 17, 2000 ASSOCIATED EARTH SCIENCES, INC. ACK!jh/ld· KB99U2A57 • LD·I>:lld\2-00 • W2K Page4 Quendall and Baxter Propenies Mitigation Analysis Memorandum creek coincident with increased sunlight in the spring. Table 2-2. Lake Washington Surface Water Quality near the Port Quendall Property. 1992-13.68 10.43 7.86 96 4.2 1.2 36.4 10 1996/ 0831 1992-15.55 II.II 1996/ 0839 1995/ 14.24 11.34 0840 1996/ 13.72 10.23 0840 1997* I 12.44 9.40 0840 7.83 8.29 7.79 7.54 97 97 97 94 4.4 3.5 3.2 3.7 1.3 0.9 1.4 0.6 36.0 38.0 36.0 38.1 ' 54 10 19 ;~~f~F\ :.NdJi · A::~o~i~? s1t:::r (~~~~&'~· iXtM±liJilsivtt:f. b~iJiiJWfitl{ ,i;i~i'~i~W; 'c~~~;;. ~t=fo.er . -~n~t >·}l~~w. 'iM~,ey ~;~m;~*~t; ';'('{~;t~~~i~{;t~r ~!;{}~~~0~§y. f~~m~~;·;'.;ti 0lfll{jt 1992-0.157 0.022 0.296 0.009 0.022 4.4 1.5 25 1996 / 0831 1992-0.117 0.029 0.31 0.008 0.017 4.2 3.4 128 1996 I 0839 1995 I 0.190 mn 0.32 0.006 0.020 9.6 1.0 2 0840 1996 I 0.181 0.031 0.324 0.007 0.020 nm nm 25 0840 1997* I 0.226 0.021 0.289 0.008 0.017 nm nm 52 0840 Notes; Lake Washingron water quality data cotlecled near Renton from 199210 1996 (Metro st3tion 0831) Lake WashinglOn water qua!ity data co Heeled from 1992 to 1995 offshore of May Creek m0uth {Source Metro station 0839). Lake Washington wale.r quality data collecled near May Creek mouth (Metro station 0840 -Deep Lake Srallon}. Monthly average of waler quality data collected at a depth of 1 meter. nm = not monitored • 1997 data inchxles only October, November am December •• Fi:eld measurement February 17, 2000 ASSOCIATED EARm SCIENCES, INC. ACKQMd -KB99U2Af7 -LD-D:\JdU-00-W2K Page 5 Quenda/1 and Batter Propenies Mitigation Analysis Memorandum Table 2-3. Lake Washington Water Quality Data Collected Near the May Creek Mouth. May ll 92 5.0 nm 21.0 May 18 92 3.4 O.Oll 1.5 May 26 92 4.6 nm run June 01 92 6.0 0.006 L6 June 15 92 5.7 0.001 run June 22 92 5.8 0.023 run July 06 92 5.5 0.0009 2.1 July 20 92 4.4 0.010 nm Aug 03 92 4.7 0.010 0.9 Aug 10 92 4.4 0.008 run Aug 17 92 4.1 0.017 nm Aug 24 92 4.5 0.028 nm Aug 31 92 4.3 0.020 run Sep08 92 3.6 0.029 2.9 Average: 4.7 0.014 s.o run ;::::;:: not monitored Source; Metro Station 0839 (shallow) February 17, 2000 ASSOCIATED EARTH SCIENCES, INC. ACK/jh/Td • KB'J91'2A57 • LD-D:lld\1.()()-W2K Page 6 Quendall and Baxter Properties Mitigation Analysis Memorandum Table 2-3. Lake Washington Water Quality Data Collected near the May Creek Mouth. (Continued) ' .. ) .. ••···} <·-·· .. · • >:·.·.· ·. • •· •. • · ..... ·_,_•· __ · .•. ·.S_. __ ... ec.-.···_•·_.c_.··.h_·_i·.·Dist_._.·.· __ -.· .•. •.·._.·_•_.··_:·._,_,_•.·._,_.'·.··_··._· i / _ •. . •. : < · ! • < rr,agspateJJcftt . . re-::-. \,.-... /,,(meter)::·-. Oct 05 92 5.0 0.014 2.5 Oct 20 92 4.2 O.Q15 run Nov 02 92 6.5 0.017 1.8 Nov 17 92 4.6 0.022 2.3 Dec 01 92 4.5 0.027 2.8 Jan04 93 6.0 0.035 3.2 Feb 01 93 3.3 0.012 2.7 Mar OJ 93 3.3 0.025 7.6 Mar 16 93 2.4 0.021 0.7 Apr 15 93 2.1 0.024 21.0 Apr 19 93 2.1 0.019 I 1.0 May 03 93 3.0 0.009 4.0 May 25 93 3.3 0.036 4.5 Jun 07 93 5.0 0.014 2.0 Jul 06 93 4.0 0.019 0.5 Aug02 93 3.0 0.059 0.1 Sep 07 93 4.2 0.009 0.4 Average: 3.9 0.022 4.l nm = not monitored Source: Metro Station 0839 (shallow) Februmy 17, 2000 ASSOCIATED EA.R1H SCIENCES, INC. ACK/j/rlld • KB99J4W7 • LD-D:Vd\2-00 · W2K Page 7 Quendall and Baxter Properties MitigaJion Analysis Memorandum Table 2-3. Lake Washington Water Quality Data Collected Near the May Creek Mouth. (Continued) Oct 04 93 7.0 0.009 0.4 Nov 01 93 5.0 0.011 2.4 . Dec 08 93 5.5 0.018 0.5 Jan 05 94 5.0 0.081 0.4 Feb 15 94 3.8 0.011 4.1 Mar 07 94 3.2 0.023 4.5 Mar 21 94 2.5 0.020 6.1 Apr04 94 2.8 0.045 18.0 Apr 18 94 3.0 0.012 7.7 May 02 94 3.8 0.020 6.3 May 23 94 2.7 0.017 6.9 Jun 06 94 3.5 0.013 7.2 . Jul 05 94 4.0 0.018 3.6 Aug 04 94 5.0 0.031 2.0 Sep 06 94 4.5 0.017 2.0 Average: 4.1 0.023 4.8 nm ;= not monitored Source: Metro Siation 0839 (shallow) February 17, 2000 _ ACK/jhlld. KB99}42A$7 · W-D:I.MUXJ. W1K ASSOCLITED EAR1H SCIENCES, INC. Page 8 Quendall and Baxter Properties Mitigation Analysis Memorandum Table 2-3. Lake Washington Water Quality Data Collected Near the May Creek Mouth. (Continued) Oct 03 94 6.0 0.011 2.5 Nov02 94 5.0 0.027 2.4 Dec 05 95 4.0 0.028 2.3 Jan 23 95 5.5 0.027 5:0 Average: 4.8 0.028 3.7 nm = not monitored Source: Metro Station 0839 (shallow) 2.1.2 Gy11sy Subbasin Drainage No historic water quality data were available for Lower Gypsy Subbasin Drainage. The Lower Gypsy subbasin flows from the east side of 1-405 through an approximately 125-foot open channel before entering a culvert in the northern area of the project site that discharges directly to Lake Washington. Lower Gypsy subbasin water discharges via tightline directly to Lake Washington and is thus classified as Class A (extraordinary) by WAC l 73-201A. This drainage is distinct from Gypsy Creek, which joins May Creek at RM 1.15. Limited water quality monitoring of the Lower Gypsy subbasin occurred on March 28, 1997 by Beak Consultants, Inc. (Table 2-4). The results were consistent with an urban stream and show some influence of upstream wetlands. Waters were neutral, cool, with low dissolved oxygen, high conductivity, and high total dissolved solids relative to most regional waters. Oil and grease were below detection, fecal coliforms were moderate (41 CFU/100 mL) and hardness was moderate. Nutrients were moderately elevated: nitrate and nitrite oxygen was 1.0 mg/Land total phosphorus was .038 mg/L. All metals met the chronic toxicity standard 0N AC 173-201A) adjusted for the ambient hardness (Tables 2-4 and 2-5); however, while cadmium, lead, mercury, and silver were all below detection, the detection levels for these metals were above their respective standard. Based on the limited water quality data (one sampling event), dissolved oxygen was below the Class AA standard ( > 9.5 mg/L). Turbidity may not meet the standard, but compliance was not determined because of lack of baseline data. It is likely that temperature would not meet the standard ( < l 6°C) during the summer months due to the low elevation and the wetland component of the stream system. During some site visits, a strong sewer odor was noticed where Gypsy February 17, 2000 ASSOCIATED EARTH SCIENCES. lNC. ACK/jhlld -KB99U2A57 · LD-D:lldl.2-00 -W2K Page 9 Quendal/ and Baxter Properlies Mitigation Analysis Memorandum subbasin enters the site from the east; however, this odor was not apparent during the single monitoring event reported here. Origin of this odor is not obvious. Table 2-4. Water Quality Measured in tbe Lower Gypsy Subbasin Drainage Outfall to Lake Washington. 10:21 9.85 7.15 0.028 1.0 0.5 l!O 5 6.3 Monitoring Dale: March 28, 1997 ·•···.·•· j;fJt:,t:;{ \it1f'.Jii~cf e; tf~H ,.,·.\ 8.00nl.8 180 0.038 0,025 <0.02 <0.002 <0.02 (dissolved) <0.002 (dissolved) <l 41 0.06 0.0105 (dissolved) 74 24-hour rainfall record~d at Sea-Tac was 0.10" on March 27, 1997, * See Table 2-S for a complete listing of the metals screening analysis. February 17, 2000 ACK/j/1/ld. XB99U21U1-W-D:lldlZ-00-W2K ASSOCIATED EARTH SCIENCES, INC. Page IO Quendall and Baxter Properties MitigaJion Analysis Memorandum Table 2-5. Results of Metals Screen for Lower Gypsy Subbasin Drainage at the Culvert Outlet to Lake Washington :.Parameter<,. ~-·-':·.-·/" ;-·'..···•·,,'.'.·>.i,·· ··i,:.-·: "-.'March28 ResultC'. ,..,,. . ., . -,,,,,, Dtttictiol'fLiniitt:>-· : .' •.. ·' .£.· . ••,.' ·-·· ' ' .... Aluminum 0.26 0.01 Antimony <0.02 0.02 Arsenic <0.03 0.03 Boron <0.1 0.1 Barium 0.015 0.003 lkryllium <0.005 0.005 Calcium 18.0 0.1 Cadmium < 0.002 0.002 Cobalt <0.003 0.003 Chromium <0.006 0.006 Copper <0.002 0.002 Iron 1.6 O.Ql Mercury <0.01 0.01 Potassium 2.2 1.0 Lithium <0.02 0.02 Magnesium 7.2 0.1 Manganese 0.320 0.002 Molybdenum <0.01 0.01 SOOium 8.9 0.1 Nickel <0.01 0.01 Pl1-0sphorus 0.08 0.05 Lead <0.02 0.02 Sulfur 3.3 0.1 Selenium <0.03 O.Q3 Silicon 1.0 0.10 Silve{ <0.01 0.01 Tin 0.02 0.02 Strontium 0.120 0.003 Titanium <0.01 o.oi Thallium <0.03 0.03 Vanadium <0.002 0.002 Ynrium <0.001 0.001 Zinc 0.060 0.002 Samples collected on March 28, 1997, Lower Gypsy Creek subbasin outfall at Lake Washington. Note: Total metals. All values arc in mg/L. EPA Method 200.7. Italics indicate results which exceed or may exceed the WAC I 73-201A surface water standard (chronic); lhe ambiguity occurs when the standard is lower than lhe detection limit and the result is below detection. Bold italics indicate a result which may exceed the acute standard (silver). February 17, 2000 ACK/jhlld • KB99UW7 -l..D-D:lk/12..(J(J • WlK ASSOCIATED EARm SCIENCES, INC. Page 11 Quendal/ and Baxter Properties Mitigation Analysis Memorandum 2.2 Plants and Animals The Port Quendall and Baxter parcels arc sparsely vegetated. Five wetland areas were delineated within the Quendall/Baxter remediation area (David Evans and Associates 1997, Figure 2-2). The Port Quendall parcel is currently an active log yard; vegetation on the site is primarily limited to the shoreline (Figure 2-3, Table 2-6). Two of the wetlands (Wetlands A and B) are found along the Quendall shoreline. Wetland A is a palustrine forested wetland dominated by immature red alder (A/nus rubra) and Himalayan blackberry (Rubusdiscolor), with a sparse herbaceous layer of reed canarygrass (Phalaris arundinacea), buttercup (Ranunculus repens) and yellow flag iris (Tris pseudacorus). Wetland B is a palustrine forested wetland comprised of red alder with a hardhack (Spiraea douglasiz) and Pacific willow (Salix lasiandra) shrub layer. Hydrology in Wetlands A and Bis controlled by the lake level. Only minor surface discharge enters these areas. Vegetation and embedded logs help stabilize the shoreline. These wetlands provide little flood control, base flow support or water quality improvement, because they lie along the shoreline and receive little surface discharge. A third wetland (Wetland C) located on the Quendall parcel is a remnant of an old industrial lagoon which currently supports a permanent open water component, emergent vegetation dominated by cattails (Typha latifolia) and a black cottonwood (Populus balsamifera) sapling shrub layer. Wetland C detains some drainage from the adjacent log yards and therefore provides some water quality function by diverting this runoff from the lake. However, no outlet was observed and the area appears to be isolated from ground water, therefore, no base flow support is provided by this wetland. The remaining vegetated shoreline along the Quendall parcel is dominated by red alder, willow and Himalayan blackberry. Industrial activities on the Baxter parcel ended in the early 1980s; a portion of the site is currently used to store bark mulch. The compacted fill soils on the Baxter parcel support sparse stands of non-native grasses and patches of sapling-and seedling-size black cottonwood and soft rush (Juncus ejfusus). Baxter Cove (Wetland E) is found along the southern Baxter shoreline and appears to have been created by shoreline fill or fill and dredge activities. Baxter Cove supports an open water component, cattails and a shrub layer comprised of Himalayan blackberry, red alder saplings and red-osier dogwood (Cornus stolonifera) and a few willow (Salix spp.) and Pacific Madrone (Arbutus menziesiz). The second wetland area (Wetland D) on Baxter is an old industrial pond isolated from Lake Washington that is dominated by cattail, Pacific willow and red-osier dogwood. The floodwater control, base flow support and water quality functions provided by Baxter Cove and Wetland D are limited due to the small area that drains each wetland area. A narrow band of vegetation, approximately 25 feet wide, along the remaining Baxter shoreline is comprised of Scotch broom (Cycisus scoparius) (also frequently referred to as Scott's broom) and Himalayan blackberry. A short open channel section of the Gypsy Subbasin Drainage is also located on the Baxter parcel. The Baxter site was cleared in 1990. Sapling red alder and willow are present on the steep banks of the channel. However, only extremely limited habitat value is currently provided by this vegetation. February /7, 2000 ASSOCIATED EARTH SCIENCES, INC. ACK/jhlld-KB99U2A.57-Ll).D:l/d\1-00-W2K Page 12 QUE N DA L L AN D B AXTER PROPERTI ES REMEDIATION RE NTON, WA S HINGTON -·---- FIGURE 2-3 Quendall and B axt er Aeri al View 13mbee Mill in right foreground) Ae11al uhoto 1s be li<>t·~c to Gate srnnrnei 1995 -------------- 0 ~ Ji "-~ gc ~ ,<,_0~ 010 ~'f-Cj ...Jf-.<v _,// :,. ' a: s( ~ ::, 0 co g ~ i f5 f" ::, 0 / / / / /// ~ f5 i 0 ~ Cl / // // ¢. ~()'/)/ ov/ "'o'</'Y _,{I} 7 GYPSY SUBBASIN DRI.INAGE (UNAFFECTED BY REME:IJIATION) / /l / -·!/.-./ < ----i;:_, R • . • ,. C}'/ . . &./ ' I // . ,,./ /' ·· .. \ .;,.v/ -··. / 1 ~/ '•.. --.. - n~ ~ ' ;, -"-. ' ' . / ./ \f;,/ '•,,, I _./' . // \._ /// / ,·. /: . . ~ . -/ '· ·. / )-/; / ;, ~ II. / ~-I -,./ ,;, 1· _.,~ , I I - / --\. WETLAl\'O ~I/ _· .// f/ WE ___ -TLAND \) D ~(<)---_./_-/ / . -E :"-/ --- ./ Ii ~ ~/ .-__ . •., Q;)'. .· ---JWETLAN~, ··, ":J,/ __ .--- 1 B "-. /,/.c· - .---. / • I <;.• '-......_.._,,,, ,/ .. " .... '1 FlWET~ND L _,/ ' ! ..j • ~/ f/1 ·./.WETLAND A I .;::;(<) I . a-. - ---~-. ... ' I-. Je.. I"!· ( I --,-_} ,--_-_,_----. ---~ / ,;/!;,/<~;( •· ·/--:/-.t'N// .,· / ... ' ,• /I /i ! I ,--·i: I ~ . .... ' ·""l!J-I ff_ I 'i f I WETLANDS AND SHORELINE VEGETATION QUENDO.LLAND BAXTER PROPERTIES REMEDIATION FOOTPRINT LEGEND Blackberry Sllrubs Trees NO'I E:: ALL HABITAT, WETLAND.AND PROJECT FEATURE LOC/\TIONS AND QUANTITIES ARE APPROXIMATE . ,A._ NORTH {J 100 :m 3JO .()C APPROXIMATE $CALE IN FEET FIGURE 2-2 DATE 9/24199 •---------------------------------------~N, WASHINGTON PROJ NO. KB99142A Quendall mui Baxter Properties Mitigation Analysis Memorandum Table 2-6. Wetlands to be Dredged or Filled by the Port Quendall Remediation Actions A B C D E (Baxter Cove) 0.20 0.37 0.17 0.08 0.23 Wetland along Lake Washington shoreline, minor surface discharge from project sjte; some shoreline protection provided by vegetation and Jogs embedded nearshore; little flood control, base flow s·uppon or water quality improvement is provided. Wetland along Lake Washington shoteli~. minor surface discharge from project site; some shoreline protection provided by vegetation and logs embedded near&hore; little flood control, base flow support or water quality improvement is provided. The wetland resulted from excavation in fill material; detains drainage from log yards; no outlet was obs.erved and the area appears to he isolated from ground water, therefore no base flow suppon is provided by this wetland; water quality improvement provided by detention of Jog yard runoff. Old industrial seUling pond isolated from Lake Washington; littie flood control or base now support is provided; no water quality improvements provided. Cove created by fill along the lake shoreline; some shoreline protection provided by vegetation and logs embedded nearshore: flood eontrol, base flow support and water quality improvement are limited due to the small area that drains into the eove. PFO • Palustrian Forested Wetland PSS • Palustrian Sc:rub-Sc:nit, Wetland PBM = Palustrian Emergent Wctlard POW • Pl.lustrian Open Water February 17, 200() A CK/jhlld • KB99l42A57 • W•D:Lld\2--00 • W1K PFO -immature red alder with a ~imalayan blackberry understory and a sparse herbaceous covl:r of cattail, reed canarygrass, buttercup and flag iris; habitat value is moderate due to adjacency to the lake; provides poteniial habitat for amphibians, pas."'trine birds and limited waterfowl nesting -observed wildlife use includes Canada goose. beaver, several species of passerine bird!.. PFO -red alder with a hardback and Pacific willow shrub layer; habitat value is moderate due to adja_cency to the la"ke; provides polential habitat for amphibians, passerine birds and limited waterfowl nesting; observed wildlife use includes Canada goose, beaver, several spedes of passerine birds. PSS/PEM/POW -black cottonwood saplings, cattails and soft rosh; perennial open waler; low habitat value due to low vegetative diversity and isolated nature of area; observed wildlife use includel Canada goose, mallards, and green heron. PSS -small wetland within former industrial area dominated by cattail, Pacific willow and red-osier dogwood; overall habitat value is low; observed wildlife use includes red- winged blackbird, snipe. PEM/POW /PSS • cattail, Himalayan blackberry, red-osier dogwood and red aider sapling; emergent vegetation established after 1990; habitat value is moderate due to adjacency to the lake; provid.es potential habilat for amphibians, passerine birds and water fowl; observed wildli,fe use includes tunles {painted and sliders); be.aver. red-wing blackbird, mallards. ASSOCIATED EAR11/ SClENCES, lNC. Page 15 Quendall and Baxter Properties Mitigation Analysis Memorandum In general, the habitat value of the remediation area is low due to the disturbed nature of the former and active industrial areas which support limited vegetation. Oily sheens were observed on the surface of the open water wetland areas and areas along the lake shoreline. The shoreline areas provide the highest habitat value in the remediation project area, but the habitat value of these areas are limited due to the dominance of non-native invasive plant species, lack of vegetative diversity and structure, and lack of special habitat features such as snags and woody debris. Most of the wildlife use observed on the site occurs along the Quendall and southern Baxter shoreline. Canada geese (Branta canadensis) were observed in both the vegetated and hardscape shoreline areas. The geese were observed nesting along the vegetated shoreline and in the osprey nest located on the Quendall Cable Station nesting platform. Puget Sound Energy moved an osprey nest from a retired distribution pole on the Baxter site to a new nest pole platform erected on the south side of the cable station in 1993. Puget Sound Energy also placed a perch on top of the first transmission pole leading away from the station to provide a safe place for the birds to perch. The osprey (Pandion haliaetus) have successfully nested on the platform since the transfer of the nest in 1993 until 1997, when the osprey built a new nest at the top of the wood chip elevator located on the Barbee Mill site to the south of the Quendall property. The osprey are present in the area from mid-March through August. Osprey have been observed hunting small mammals (likely mice) on the north Baxter site as well as fishing the lake. Canada geese and bald eagles (Haliaeetus leucophalus) have occasionally been observed perching on the nest platform during the winter months. It is assumed the bald eagles used the perch site to forage for fish and waterfowl along the lake shoreline. The closest known bald eagle nest site is located approximately 0.75 mile west of the remediation area (WDFW, May 1997 PHS database). Numerous duck species also use the Baxter offshore area. Beaver (Castor canadensis) have been observed in the wetland habitat along the lake shoreline. Pond sliders (Pseudemys scripta) are present in Baxter Cove and have been observed on floating logs off of the southern Baxter and northern Quendall shoreline. Red-winged blackbirds (Agelaius phoeniceus) were observed using cattail habitat along the shoreline and isolated patches of cattails away from the shoreline (Wetland D). Snipe (Capella gallinago) were observed in the Wetland D area and in the cottonwood sapling-dominated areas on the Baxter parcel. Other species of passerine birds and amphibians could be supported by the shoreline wetlands and the narrow red alder-dominated upland shoreline area. Z.3 Fisheries Affected Environment 2.3 .1 Introduction This section describes existing fish habitat conditions within the area that would be impacted by remediation activities, and provides an assessment of the various components that make up this habitat. A description of known fish use of the habitat is also provided. February 17, 2000 ACK/jh/ld • KBfl9U2AS7 • LD·D:\fd11•00 -W2K ASSOCIATED EA.RTFI SCIENCES, INC. Page 16 Quendall and Baxter Properties Mitigation Analysis Memorandum The remediation activities are being implemented with a primary intent of enhancing sediment and water quality in Lake Washington. Improving the uplands portion of the sites is also a critical component of the remediation project. This will benefit all species rearing and migrating along the project shoreline. Existing conditions for the shoreline and nearshore areas are described in the following text. 2.3.2 Lake Washington Biology Pelagic Species Lake Washington supports a variety of anadromous salmonids, including chinook (Oncorhynchus tshawytscha), coho (0. ldsutch), and sockeye salmon (0. nerka), and steelhead (0. myldss) and cutthroat trout (0. clarkl). Runs ofnon-anadromous kokanee (0. nerka) salmon are also present (King County, 1993). Lake Washington contains a wide variety ofnon-salmonid species, some of which are considered "warm water" species. These include both native and non-native species such as speckled dace (Rhinichthys osculus), three-spine stickleback (Gasterosteus acu/eatus), northern squawfish (Ptychocheilus oregonensis), yellow perch (Perea flavescens), black crappie (Pomoxis nigromaculatus), largemouth bass (Micropterus salmoides), srnallmouth bass (Micropterus dolomieul), mountain whitefish (Prosopium wi/liamsoni), largescale sucker (Catostomus macrocheilus), longfin smelt (Spirinchus thaleichthys), and prickly sculpin (Cottus asper) among other species (Pfeifer and Weinheimer 1992, King County 1993, Wydoski and Whitney, 1979). A more complete list of fish species potentially found near the project is provided in Table 2-7. Of particular importance to the project is the presence of chinook salmon in Lake Washington. On March 16, 1999, the National Marine Fisheries Service (NMFS) listed the Puget Sound evolutionarily significant unit of chinook salmon as a threatened species under the federal Endangered Species Act (ESA). Adult chinook salmon migrate past the site on their way to the Cedar River each summer. Juvenile chinook pass the site on their trip back out to the Puget Sound and may spend some time rearing in the site vicinity. Beach seining surveys by the Muckleshoot Indian Tribe in Kennydale Park found chinook fry rearing nearshore from March through June (Figure 2-4). February 17, 2000 ASSOCIATED EARTH SCIENCES, INC. ACKQh/Jd · KB99U2A51-W-D:lld\2.(J(}-W1K Page 17 Quendall and Baxter Properties Mitigation Analysis Memorandwn Figure 2-4. 1994 beach seining results at Kenny dale Park. :i: <ll fi: ~ ~ ~ I 0 Feb Mar 60 50 40 30 20 10 0 Feb Mar r,::.:=-soCKEYl! FRY '-*"-CHINOOK l-t-SQUAWPISH February 17, 20()() ACK.ljhlld • KB99J"2AS7 • LD-D:lld12..QO • W2K DAY SURVEYS Apr 1994 Apr 1994 . May May -il-SOCKEYE PRESMOLTS -+-COHO -+-YELLOW PERCH ---LM BASS -SM BASS Jun Jun ASSOCIATED EARTH SCIENCES, INC. · Page 18 Quendall and Baxter Properties Mitigation Analysis Memorandum Table 2-7. Fish Species in Lake Washington tt~~~~~J!~IW~f!fJ};J¥,Ji'mt}J ~;;g~~99;ij'.~~4i\,~~lr~'.t\h;</}iff.~i\~_ h§·q~i(0:C~J~~~M*f&Jf5¥-ff:U.'.!}Jt'.2W?%t0t% Petromyzontidae Western brook lamprey La,npetra richardsoni Lampreys Pacific lamprey Entosplunus tridentatus River famprey Lampetra ayusi Aclpcnscridae White sturgeon Acipenser transmontanu.s Sturgeons Clupeidae American shad Alosa sapidissima Herrings Salmonidae Mountain whitefish Prosopium williamsoni Trouts Cutthroat trout Oncorhynch.u.s clarki Rainbow trout (steelhead) Onccrhynchus mykiss Brook troul Salvelinus fQnJinali.s Lake trout Salvelinus ,ramaycush Coho salmon Oncorhynclws kisutch Chinook salmon 011corhy1tchus tshawytscha Chum salmon On.corhynchus k.eta Pink salmon Oncorhynchus gorbuscha Sockeye salmon (kolcanee) 011corhy11chus nerka Osmeridae Longtin smelt Spirindius thaleichJhys Smells Cyprinidae Carp Cyprinus carpio Minnows Peamouth Mylocheilus caurinus Northern squawfish Pryclwceilus oregonensis Speckled dace Rhinichthys osculus Redside shiner Richardsonius balteaJus Tench nnca tinca Catostomidae Largescale sucker Calostomus macrocheilus Suckers Jctalurjdae Brown bullhead lctalurus nebulosu.s Catfishes Channel catfish lctalurus pu,ictarus Gasterosteidae Threespine stickleback Gasterosteus aculeatus Stickleback Centrarchidae Smal1mouth bass Micropterus dolomieui Sunfishes Largemouth bass Microptuus s{llmoides Black crappie Pox.omis nigromaculatus Percidae Y cUow perch Perea jla"Vescens Perches Cottldae Coastrange sculpin Cottus akuticus Sculpins Shorthead sculpin Coitus COn/USllS Torrent sculpin Cottus rhotheus Prickly sculpin Coitus asper Riffle sculpin CotUts gulcsus Pacific staghorn sculpin LJ!ptocottus amatus Source: Shepard and Hoeman 1979. Also of importance to the project is the population of sockeye salmon juveniles which rear in Lake Washington. These fish may utilize the shoreline and offshore habitat along the project for rearing. The majority of sockeye outmigrate from the Cedar River, although a smaller number February 17. 2000 ASSOCIATED EARm SCIENCES, INC. ACX/jlllld -KB99UW1 -LD-D:lld\2-00-W2K Page 19 Quendall and Baxter Properties Mitigation Analysis Memorandum may be the result of beach spawners. The Cedar River sockeye is a non-native species originating predominately from Baker River stock and introduced in 1935 (WDFW et al. 1994). The stock is currently believed to be depressed based on a Jong-term negative escapement trend (WDFW et al. 1994). Sockeye are not known to have spawned historically along the Quendall and Baxter project sites (Muckleshoot Indian Tribe, 1997). Areas of suitable substrate were looked for during diver and video surveys for this project. It was assumed that any area with large sand to medium sized gravels and evidence of upwelling may be used for sockeye spawning; however, little suitable habitat was found and there was not any evidence ofredds. One small upwelling site was noted by divers in about 30 feet of water off the mouth of May Creek. Similar small upwellings may exist off the Quendall and Baxter shorelines that were not observed by divers, however geohydrology studies and modeling do not suggest concentrated points of upwelling should be expected to occur. Naturally spawned fry begin leaving the Cedar River each year starting in late December. Millions more hatchery fry are released into the river starting in March. The fry migrate downstream to Lake Washington where they may spend from one to two years before emigrating to the sea. Recent studies in southern Lake Washington found the majority of sockeye fry migrate into deep water soon after reaching the lake and head north (Burgner, 1991; UW, 1996). A few fry were found in the nears ho re environment for up to one month after emerging. By late summer, sockeye densities are highest at the north end of the Jake (Burgner, 1991). Predation of sockeye fry in Lake Washington is believed to be a major cause of low recruitment (University of Washington, 1996). A considerable amount of research is currently being undertaken by the Muckleshoot Tribe, U.S. Fish and Wildlife Service (USFWS), University of Washington (UW), Washington Department of Fish and Wildlife (WDFW) and King County to better understand the early life history of sockeye in Lake Washington and the various factors influencing predation. Currently northern squawfish and cutthroat trout are believed to be the major predators of fry ·(UW, 1996). Estimates of sockeye consumption by squawfish in Lake Washington range between 3 , 000, 000 and 11,000,000 fry per year (UW, 1996). Smallmouth and largemouth bass, prickly sculpin, yellow perch, rainbow trout and coho salmon also consume sock eye juveniles but in much fewer numbers. Although bass were once believed to be major sockeye predators, recent evidence indicates this is not entirely true (UW, 1996). Life history studies of the two bass species and sockeye in Lake Washington show few opportunities for the three species to interact. Gut analysis confirmed the studies (UW, 1996). Each spring when juvenile salmon are most abundant, less than 10 percent of the diet of smallmouth bass is made up of this prey item. Most sockeye consumed by largemouth bass are taken in the ship canal where they are concentrated during the outmigration period. Total bass consumption of sockeye fry is estimated at less than 100,000 fish per year (UW, 1996). Ten beach seining surveys at Kennydale Park, approximately 0.7 miles south of the remediation site, were conducted by the US Army Corps of Engineers and the Muckleshoot Indian Tribe between February and June, 1994 (Muckleshoot, 1997). One survey was completed during the February 17, 2000 ACK!jlllltl • KB99142A57 • LD•D:Vd12..(J(} · W2X ASSOCIATED EARTH SCIENCES, INC. Page 20 Quendall and Baxter Properties Mitigation Analysi, Memorandum day and one survey at night each month. Relatively high numbers of sockeye fry, chinook fry, coho fry, and yellow perch were captured (Figure 2-4). Lesser numbers of sockeye presmolts, smallmouth bass, and squawfish were caught. Most sockeye were observed in May during the daytime surveys. A high number of yellow perch were also captured during the same survey. Fewer sockeye fry were captured in June but a higher number of chinook were netted. Again, an abundant yellow perch population was also netted. The coho population peaked in April. Benthic Species Crayfish (Pacifasticus spp.) and freshwater shrimp (Ostracods and Mysids) are relatively abundant benthic biota in the vicinity of the project. Numerous individuals were observed in diver and video surveys within the outer harbor line. Most crayfish were associated with larger pieces of wood where many were noted protecting the entrance to dens under logs. Freshwater clams (Pelecypods) were also noted in several places on the lake bed. Other benthic species potentially found in Lake Washington, within and around the remediation bounds are listed in Table 2-8. No site specific benthic studies were completed as part of the assessment for this project. 2.3.3 Lake Washington Shoreline Survey Methodology Physical surveys of the Lake Washington shoreline along the project boundary were undertaken to characterize existing conditions affecting fish habitat. A total of 3,130 feet of shoreline was walked from the northern edge of the Baxter property to the southern edge of the Quendall parcel. A hip-chain was pulled to measure distances. Five variables (riparian vegetation, bank type, bank protection, substrate, and water depth) were assessed at roughly five-foot intervals. The dominant characteristic in each five-foot interval was noted on a spreadsheet. Substrate and water depth were measured approximately five feet from shore. Overwater structures were also noted and measured. Existing literature was reviewed to describe shoreline characteristics in the immediate vicinity of the project. This infonnation is provided for comparison with project site conditions. On-Site Habitat (]Ild Valuation Project shoreline characteristics are shown in Figures 2-2, 2-5 and 2-6. Features within the remediation area are summarized in Table 2-9. February 17, 2000 ACK{jMd · KB9914W'J. LD-D:IJd\2.00 · WlK ASSOCIATED EARTH SCIENCES, INC Page 21 Quendall and Bax/er Properties Miligation Analysis Memorandum Table 2-8. Chironomidae Benthic Biota Pl'esent in Lake Washington. Macropelopia, Euki.efferiella, Heterotrissoc/adius, parakieffereriella, Chiro,wmus, C/adopebna, Tanytarsus Cryptocltironomous, Dicrotendipes, Einfeldia, Phaenopsectra, Polypedilum Ceralopogonidae Oligochaeta Tubijiciifae, Naiduiae Nematoda Ostracoda Pelecypoda Pisidium Tricoptera Copepoda Hydracarina Piona Gastropoda P/anorbella Amphipoda Hyale/la aveca Ephemeroptera Plecoptera Per/odidae Collembola Mysidacea Taphromysis Hirudinea Tardigrada Porifer"a Brachiopoda lsopoda Caecidotea Coleoptera Psephenus Sources: Shepard and Hoeman, 1979, Bennet and Cubbage, 1992. Midges biting midges aquatic earthworms roundworms seed shrimp freshwater clams caddisflies mainly harpacticoids water mites Snails scuds and sideswimmers Mayflies stoneflies springtails seed shrimp leeches water bears sponges daphnia aquatic sowbugs beetles The shoreline riparian vegetation is dominated by Himalayan blackberry (46%) which grows up to, and in places, over the lake. The remaining area is split about evenly between shrubs (primarily Scotch broom) and an unvegetated condition (Table 2-9). Approximately 25 percent of the shoreline is also overhung with a sparse tree canopy layer. Most trees are young alder (to about 4 inches diameter at breast height [DBH]). The trees are typically set back from the shoreline five to ten feet and associated with the four lakeshore wetlands (Figure 2-2). No trees large enough to provide large woody debris (LWD) were noted. Wetland habitat influences approximately 17 percent of the shoreline. February 17, 2000 ACX/jhM • KB991.f2A57 • LD-D:\fd\24JU • W2K ASSOCIATED EAKl1I SCIENCES, INC. Page 22 Quendall and BaXJer Properties Mitigation Analysis Memorandum The existing shoreline vegetation provides little visual refuge for fish, bank stability, insect habitat, or shading, because the lack of diversity and non-native characteristics of the existing vegetation are not well suited for these purposes. The young, sparse hardwood stand currently growing along the banks do not provide any of the above fanctions or serve as a source of large woody debris or bank refuge beneath undercut rootballs. The majority of the bank (56%) is unsupported and consists of steep dirt banks from one to four feet high (30%), or relatively low gradient "beach" like shoreline (26%) (Figure 2-5). Manrnade structures and protection features (rip-rap, log bollards, piers, buildings, log skids) cover 33 percent of the shoreline (Table 2-9). Eleven percent of the bank could not be surveyed due to heavy blackberry coverage. Four percent of the bank (110 feet) is undercut by wave action. Large logs floating or sitting on the lake bottom near the shore protect 81 percent of the shoreline. These logs I)Ot only shelter the banks from wave action, they provide excellent rearing and shelter habitat for fish and macroinvertebrates. Historically the lake shoreline was primarily low-gradient beach habitat formed as the delta of May Creek. Over time, erosion caused by industrial landfilling, riparian vegetation removal, and wave action has created oversteepened banks. Other banks are artificially protected with rip-rap and log bollards. Neither condition is conducive to habitat formation. Cull logs and stringers from the mill effectively provide many of the habitat functions and diversity normally associated with large woody debris (LWD). Various manmade structures provide some diversity and overhead cover, and may be used by juvenile salmonids (Ratte and Salo, 1985; Heiser and Finn, 1970). Inlets, or coves make up approximately 26 percent of the shoreline. Most have a few pieces of LWD floating or sitting on the bottom. These areas of meandering shoreline add diversity to the relatively straight shore elsewhere. Shallow coves filled with LWD could provide nursery areas for many species of fish and benthic organisms. Surficial substrate along the shoreline is dominated by sands (54 % ) with relatively equal proportions of mud/silt and gravel in other areas. None of the substrates are free of silts; a muddy layer underlies most areas. A large amount of woody debris including wood chips covered the substrate in several areas (Figure 2-6). Clean gravels can provide spawning habitat for sockeye as well as macroinvertebrate habitat. Finer materials anchor vegetation and are preferentially inhabited by other aquatic species. Dense wood chip coverage leads to anaerobic conditions and a relatively sterile environment. No benefit is derived from the wood chip coverage. Water depths five feet from shore are typically less than one foot (57%). Only 15 percent of the shoreline has a slope greater than about 3: 1. These areas are usually heavily disturbed by nearshore activities and may have resulted from past filling of the lake. February 17, 2000 ASSOCIATED EART1l SCIENCES, INC. ACK/j/JJd-KB99l42A$1-W.D:\ldl2-00-W2K Page 23 f. • 2 t} a; ~ I g C "'o'-0 0<00 ~'re.:, 'v05'., >-0.: "' ~ :5 0 (lJ ~ [! . 1/ Q: ' f1:l I 5f 'h ; i 0 0: < CJ J , '1-0·' \,:';) 0' <',' \\. // ,// / / / / / o'?·, Is) '( "'' v't ,. f' 0 ~/ rcc,f/ II ,, J /,.c:..'.::..c...:.:l'-e: //~ ~ I; J ~ --·· L:.: .. ,~-!,--', • .;;. , .. - WETLAND A ·-~_:~---· ......... I-,·::: ft<? J' _,/ / f ' GYP.SY SUBBASIN or:.-'\!NACL . ' . ..., ""-... (lJNAFrfCTED BY f<FMEO!,C..TION)!-;ii"" ,."- fi ~~ ~.· ~/ / / if/ ~ ' ~· Q/ / / WETLAND B -~._ ----1.,,, WET/ t:ND ~- A._«i .. L• ~~·i ,/ //'/ ,,,.,/ / / '·-., ', \,, \ WETLAND C ;;ti :-x-/ ~);/ I;-::: / J'f I --=.:~:--./ --- *"'" -~ WETLANDS AND SHORELINE STRUCTURE QUENDALL AND BAXTER PROPERTIES REMEDIATION FOOTPRINT RENTON, WASHINGTON ---:si,w-.i ~:::....:,.~ .. ~-= ' LE(:FND 8t' 1d1 V:21\!C,"ii dr1i F<:p-rap iJ1·ide1c~1i l.09 bollc1rct Logs ir 1 lake Nm i ALL HACITAr WE r LAND. AND PflOJECT Ft::AILJRL LOC:i' 1 IONS AND QIJANTITl~S ARE APPROXIMATE ~ NORTH 0 100 _ :lXJ 2(0 4'..0 APPROXl~.V,TE SCP.LE IN fEET FIGURE 2-5 DATE 9!24198 PROJ. NO. K899142A t "'o~ ~~0 ~'rCj 'v'r-1:-<v >-i ~I ~i :::, I Of ~I o· &! I l' ct }!! :::, 0 / / t1-< ' 0""'- \)~ (/p o«-.· 9'9 . y,.'I' '\<:.,0 • 00 /. / GYPSY SUBBA . ~· . (UNl".FFECTED SIN [lf~AIN1\GE '"-... BY f'E-, 'E ' i,1 OIATION) . . .. . ", . / . "'"· </ // /·-.. _ --;, "·.,. c.:0.' ./ . . --.,. ,')J . • k>' ··. d'7 '. ·· ... <:>~</-;/ _/; I ··· .•. './ rF .. ,. ·. / ',,, // d.\t ·····~. / J( ~· ~ ~ ( ,./ /' / /// / / { 1. .. WETLAfiD \ I D WETLAND E 4):/ ~/. .---.. . ! 1) /// WETLAND B QJ~/ /~ ,, I / ,/ Q' i' (/J [(' lJJ ~- 0 l r ·~ ;/ / . -./ WETLAND A WETLAND C ;:;1 ~1-f) 0/ & .J.- t tr ---------=---=-------=--·r-·· ----~, ·-* -- If t· -~;_,,;: I".'--~.: ;Of- ~:.'&-· ~••L•--- LEGEND SlJBS.TRI\TE Mud silt Sand Giavel >50% wood chips DJa.eJH 0-1 foot 1-2 feel >2 feel NO'I '' ALL HABllAI. WETLAND. AND PROJECT FEATURE LOU1l IONS AND QUANTITIES ARE APPl<OXIMATE ~ NORTH 0 1Cf) 3XI 3fJ .W APPROXIMATE SCALE IN rEU l·. ,. ''t.t -.}!i.··· ,}h~~·· li'' . . .. f,_!1}*~5~-• ·r ! t f t' I~ I~ .. -\... :rt· ,.===================== WETLANDS AND SHORELINE SUBSTRATE AND DEPTH QUENDALL AND BAXTER PROPERTIES REMEDIATION FOOTPRINT RENTON, WASHINGTON FIGURE 2-6 DATE 9/24/99 PROJ. NO. KB99142A Quendall and Baxie, Properties Mitigation Analysis Memorandum Table 2-9. Lake Washington shoreline characteristics for the Quendall and Baxter Properties. Vegetation none 800 26% blackber 1,425 46% shrubs 905 29% trees 770 25% wetland 535 17% Bank type/Protection beach 805 26% 930 30% 415 13% 0 0% 515 16% 55 2% 35 1% 35 1% undercut I IO 4% inlet 820 26% lo s 2,550 81% Substrate 11 mud/silt 755 24% sand 1,685 54% ravel 690 22% woodwasteb 500 16% Depth' 0-I ft. 1,775 57% I -2 ft. 870 28% >2 ft. 485 15% 3,130 feet. surveyed 11 April 1997 • Measured or sampled approximately five feet out from shoreline. • Woodwaste = areas where chips and bark exceed 50% surface coverage. Anthropogenic structures are found in several areas along the shoreline. Two boat sheds ( one sunken), half a dozen docks, a barge, three boats, two Jog skids and several other smaller structures impact approximately 5 percent of the shoreline. All of these structures overhang shallow water habitat in Lake Washington. No floating log rafts were present offshore of Baxter or Quendall the day of the survey, although aerial photographs indicate this practice was historically common. The Gypsy Subbasin Drainage enters the Baxter property via a 24-inch concrete culvert beneath the Burlington Northern railroad tracks (Entranco, 1995). The culvert is 55 feet long, has a gradient of approximately 2 percent, and is likely a barrier to upstream fish passage. Upon entering the property, the drainage is discharged to a small (approximately JO foot diameter), quarry-spall lined pond. From the pond, the drainage enters a 24-inch, 46-foot long concrete culvert beneath a dirt haul road before daylighting again to an open channel. The open channel is February 17, 2000 ASSOCIATED EARTH SCIENC£S, INC. ACK/jhfld • KB99142AS7 • W•D;lfdll·OIJ • W2K Page 26 Quendall and Baxter Properties Mitigation Analysis Memorandum a highly confined, steep-walled trough, approximately IO to 15 feet below the surrounding ground elevation and 3 to 10 feet wide at the bottom. The substrate consists primarily of a deep anaerobic mud except where bank sloughing and rocks spilled into the channel have replaced the mud with a firmer bed material. The banks are heavily vegetated with a narrow strip of young hardwoods, Scot's broom, and Himalayan blackberry. Total length of the open channel is approximately 125 feet. The drainage next enters a 490-foot, 24-inch CMP which discharges directly to Lake Washington. The 490-foot CMP drops approximately 0.5 foot (0.1 % gradient) and at low lake elevation is perched about a foot above the lake water surface. During high Jake elevations, the culvert is partially backwatered and upstream passage is possible, though not known to occur. Off-Site Habitat A considerable amount of fisheries habitat information in South Lake Washington has been collected by the Muckleshoot Indian Tribe. Some of the data are summarized here to provide a comparison of on-site conditions with those found along the adjacent shoreline off-site. Shoreline composition was surveyed in September 1995 (Muckleshoot, 1997). Percent bulkhead, sloped bank (beach), and vegetated distance was assessed between river mile (RM) 32 and RM 46. The Port Quendall remediation site (RM 37.9 -38.5) was not surveyed due to access problems associated with the log booms. The data are plotted in Figure 2-7 with the 1997 remediation site information inserted in its appropriate location for comparison. Overall, the remediation site shoreline is in a much more natural condition than the surrounding shoreline (Table 2-10). Eighty-three percent of the shoreline surveyed by the Muckleshoot Indian Tribe has been bulkheaded while 33 percent of the remediation site has received similar bank protection treatment. Only 15 percent of the surrounding shoreline has low gradient banks and only two percent is vegetated (not including vegetated bulkheads). This compares with 26 percent low gradient bank and 60 percent vegetated bank for the remediation area. Table 2-10. Comparison of Shoreline Conditions within the Remediation Area and the Surrounding Shoreline. Bulkhead/other bank pr<Mection ( % ) Sloped bank/beach (%) Vegetated' (%) 1Vcgcta1ed dislancc docs no1 include vegetaled bulkheads. Source reference: MuckJcshoot 199.5 February 17, 2000 ACKl}lrlld-KB991.f'2A37-W-D:lldl2-DO-W2K 33 26 (i() 83 15 2 ASSOCIATED EA.Rm SCIENCES, INC. Page 27 Quendo.ll and Baxter Properties Mitigation Analysis Memorandum Figure 2-7. Lake Washington Shoreline Composition along a 14-Mile Reach of Lakeshore on Both Sides of Quendall and Baxter in September 1995. r--·----·--·------ ~ z iii 0: 0 ,: "' u. 0 Ii: 100% T 900/o t " 80% I 70% I ::1 40% l • • • • Remediation area ---..i • • ,. • 30% ! • D : I_,_:_: ___ -!-_:_\'.. 0 • :_-+--+- "' ffi 11. w 31 g n M ~ ~ ~ • s w ~ a a M ••a•~ w LAKE MILE I L [-+·%-BULKHEAD o % SLOPED 4 % VEGETATED J --------·.-•••¥•-·----- source reference: Muckleshoot Indian Tribe 1995 Pier coverage of the water surface within 100 feet of the shoreline was estimated from 1989 aerial photographs and a review of environmental documents published between September 1991 and July 1995 (Muckleshoot, 1997). The values are believed to underestimate the real coverage due to an incomplete database and unauthorized development. For the eleven mile reach surveyed (which includes the remediation reach) a total of 517 piers were counted (47 piers/miler This compares with 4 piers, or 7 piers/mile within the remediation reach (Table 2-11). Overall surface coverage averages 4.2 percent of the first 100 feet oflake for the eleven mile reach. Within the remediation area, only 0.6 percent of the lake surface is covered with piers. Table 2-11. Comparison of Overwater Pier Coverage within the Remediation Area (1997) and the Surrounding Shoreline (1989). Number of Piers/mile 7 47 Estimated Coverage (ft'/mile) 3,008 22,368 Estimated Coverage(%) 0.6 4.2 1989 data supplied by the Muckleshoot Indian Tribe (Muckleshoot, 1997). February 17, 2000 ASSOClATED EARTH SCTENCES, !NC. ACX/jhlld. KB99u2<s1 -w-o,ud1u,o . W2K Page 28 2.3.4 Lake Washington Open Water Benthic Quendall and Baxter Properties Mirigario11 Analysis Memorandum In general, the Quendall and Baxter offshore lake bottom drops off gently at slopes between approximately 20: 1 and 9: 1. Small localized areas with slopes in excess of 3: 1 are present. After dropping relatively quickly to 15 to 20 foot depths within 250 feet from shore, the gradient flattens into a broad plateau sloping gently for another 400 to 600 feet offshore. Approximately 5 to 10 additional feet in depth are gained over this plateau. Additional topography/bathymetry information and a map is provided in the Sediment Quality Memorandum, Section 4.1 (RETEC, 1997). The vast majority of remediation activities will take place in 10 or less feet of water, although dredging near the old T-dock would occur in about 30 feet of water. The surface of the lake bottom substrate was characterized in terms of particle size and organic material (e.g., wood chips). The subsurface composition was examined via sediment-profile imaging (SP!). The surficial layer was surveyed with video by both towed and diver operated cameras, and during the SPI surveys. In general the lake bottom consists of very fine particles. Occasional sandy areas were also noted. No graveled areas were noted. A more complete description is provided in Section 4.2 (RETEC, 1997). SPI images provide a measurement of the substrate depth in which aerobic activity is occurring (RETEC, 1997). These data are useful in assessing the quality of habitat for epifauna and infauna. A thin redox potential discontinuity (RPD) is indicative of a su·essed environment. Stress can occur physically (e.g., prop wash) or chemically (e.g., high biological oxygen demand or chemical contamination). RPD depths of less than 0.4 cm are indicative of an anaerobic condition. The shallowest RPD depths in the remediation area ( < 0.2 cm) were measured off the southern end of the Port Quendal\ parcel and were associated with areas with high wood waste (RETEC, 1997, Figure 6-2). Intermediate RPD levels (0.2 to 0.8 cm) were observed over much of the rest of the lake bottom off Port Quendall. These levels are indicative of a disturbed environment where benthic stress is present but likely varies. Both scattered wood debris and chemical contamination are likely present. The rest of the remediation area has RPD depths over 0.8 cm, which is considered to be a relatively undisturbed benthic condition in terms of overall animal-sediment interactions for nearshore environs in this portion of Lake Washington (RETEC, 1997). A complete description of the SPI process, wood and chemical contamination extents, and associated maps are provided in the Sediment Quality Memorandum, Section 6 (RETEC, 1997). Sunken logs are present throughout the remediation area with the highest densities (3 to 5 logs/acre) mapped along the Quendall shoreline. Much of the aquatic organisms observed during video surveys (e.g., crayfish, sculpin, perch) were associated with the logs. Milfoil was noted during the side-scan sonar and video surveys (RETEC, 1997). Areas of dense milfoil are mapped in Figure 2-2. Milfoil is common throughout most of the remediation area at water depths from about 4 to approximately 15 feet. Only in the dense woodwaste area at the south end of the remediation area was milfoil relatively absent . . February 17, 2000 ACK/jhlld -KB99U2A57-LD-D:\Jdl2-00 · W2K ASSOQATEI) EARTH SCIENCES, INC. Page 29 Quendall and Baxter Properties Mitigation Analysis Memorandum Water Column Pilings and dolphins (tied piling cluster) are scattered throughout the remediation area with 64 percent located off the Port Quendall parcel. A total of 73 vertical structures, mainly dolphins, have been mapped to date. These structures provide vertical habitat which many species utilize, including some salmonid predators, (e.g., bass). Several hundred individual upright pilings, many not rising above the water surface, also likely exist but have not been mapped. The pilings also provide attachment and focal points for aquatic organisms such as freshwater mussels. Several sunken strncrures along the Quendall shoreline are also present in the water column including the old boat house and several partially sunken pier sections. Suiface A number of anthropogenic structures and objects exist on the surface of Lake Washington which have an influence on aquatic habitat quality. A varying quantity of logs have been stored as log rafts off the shoreline of Barbee Mill, Baxter and Quendall. Vessels including tugs, barges and recreational boats have been anchored in the area. Numerous docks are present in either a permanent (i.e., mounted on pilings) or temporary (i.e., floating) basis. Structures on the lake surface provide overhead refuge cover for numerous aquatic species as well as their predators. Salmonids in particular prefer overhead cover, especially when near shore. A number of smaU oily slicks have been observed nearshore and are believed to be coming from old creosote deposits (Figure 4-6 in RETEC, 1997). These slicks impact aquatic habitat via both chemical and physical processes. Chemically, various components of the creosote are toxic to aquatic life. Physically, the slicks present a barrier at the air/water interface. Fish feeding at the surface can become contaminated. Prey items stuck in the sheen are not consumable. 2.3.5 Habitat Valuation Numerous protected alcoves, abundant woody debris, overhanging trees, and relatively low human disturbance along the shoreline offer good potential rearing and migrating strncture for fish, especially when compared to the adjacent Lake Washington shoreline. Although a number of beneficial habitat features exist, they are compromised by the constant seepage of chemicals and oily residues. Under existing conditions, therefore, habitat value of the remediation site for fish is low. Offshore habitat in the remediation area rauges from good to poor. Those areas contaminated with chemicals and wood chips offer poor to negligible benthic habitat. The majority of the lake bottom is relatively clean, however, and the numerous sunken logs provide good strncrural diversity for a number of aquatic species. The vertical and floating structures benefit some species (e.g., smallmouth bass) to the possible detriment of others (e.g., juvenile salrnonids). February 17, 2000 ASSOCIATED EARm SCIENCES, INC. ACK/j"1/d-KB99U2A51-LD-D.'lldl2-()(J · W2K Page 30 Quendall and Baxter Properties Mitigation Analysis Memorandum Fish habitat value of the Gypsy Subbasin Drainage within the project boundary is minimal. The two short open stretches offer some potential rearing habitat, however, shallow depths, a muddy substrate, no instream structure, and little instream cover limits the overall habitat value. With little protection from high velocities, winter storm events likely flush many fish from the system. Summer conditions produce extremely low flows which may also limit the habitat quality. 2.4 Recreational TI1ere is one private dock and boathouse located over Lake Washington at the extreme northern boundary of the Baxter parcel. No other recreational opportunities and no public access are currently provided on the site. Recreational resources are not discussed further. 2.5 Cultural See Larson Anthropological/Archaeological Services, 1997, for a cultural resource assessmenJ of the Quenda/l and Baxter sites, as well as for recommendations for cultural monitoring based on the assessment findings. 2.6 Economic A portion of the Baxter parcel is used for storage of "beauty bark." The southern portion of the Quendall parcel is used for log sorting. Both of these uses would be curtailed by remediation. A utility right-of-way separates the Baxter and Quendall parcels, however use of this right-of-way is not affected by remediation. Economic resources are not discussed further. February 17, 2000 ACX./jhlld · KIJ991..f2AS7 · LlJ.D:\Jd\Z-00 · W2K ASSOCIATED IiARTH SCJiiNCiiS, INC. Page 31 Quendal/ and Baxter Properties Mitigation Analysis Memorandum 3.0 IMPACTS 3 .1 Plants and Animals 3 .1. I Disturbance to Shoreline Land-based remediation will result in the excavation and/or capping of I ,150 feet of the Quendall shoreline (Figures 3-1 through 3-3). Approximately 660 linear feet of vegetated shoreline, including Wetlands A and B, will be impacted (Table 3-1 and Table 3-2). The capping _activities on the Baxter Parcel are not expected to directly impact shoreline vegetation. All wildlife use of the shoreline areas will be eliminated where vegetation is removed, or severely curtailed where it remains, during active remediation. Remediation is likely to require an 18-month period. Nesting waterfowl a_nd passerine bird use will be the greatest wildlife use impacted during shoreline remediation activities. Table 3-1. Shoreline Vegetation Disturbance Resulting from Upland Excavation and/or Capping Total shoreline impacted 1,150 feet Non-vegetated shoreline 490 feet Vegetated shoreline 660 feet Blackberry 425 feet Upland shrubs (non-blackberry) 235 feet Upland trees 345 feet Wetland 280 feet 3.1.2 Dredge Offshore Polycyclic Aromatic Hydrocarbons (PAH) Wetland E (Baxter Cove) will be dredged to remove polycyclic aromatic hydrocarbon (PAH) sediments, which will remove all vegetation and woody debris in the wetland and most of the adjacent vegetated area. Turtles will be displaced from this shoreline area during the dredging activities. Red-wing blackbird nesting habitat will be eliminated. PAH dredging offshore of the Quendall parcel will remove 106,200 ft2 of milfoil, which is considered to be a positive impact. The positive impact will likely be short-lived, as the milfoil would be expected to recolonize. February 17, 2000 ASSOCIATED EARffi SCIENCES, INC. ACK/jlllld · KB991'2AS7-LD-D.•llt/lUJO-W2K Page 32 Table 3-2. A B C D E (Baxter Cove) Quen!Ulll and Baxter Properties Miligation Analysis Menwrandum Impacts to Wetlands to be Dredged or Filled by the Quendall and Baxter Remediation Actions (Refer to Figure 3-1) 0.37 0.17 0.08 0.23 Wetland along Lake Washington shoreline, minor surface discharge from project site; some shoreline proteclion · provided by vegetation and togs embedded nearshore; little flood control. base flow support or waler quality improvement is provided. Wetland along Lake Washington shoreline, minor surface discharge from project site; some shoreline protection provided by vegetation and togs embedded nearshore; little flood control, base flow support or water quality im rovement is rovided. Excavation in fill material: detains drainage from log yards; no outlet was observed and the area appears to be isolated from ground wacer, therefore no base flow support is provided by this wetland; water quaJity improvement provided by detention of log ard runoff. Old industrial seuting pond isolated from Lake Washington; little flood control or base flow support is prov,ided: no water quality im rovements rovided. Cove created by fill along the lake shoreline; some shoreline protection provided by vegetation and logs embedded nearshore: Hood control, base flow support and water quality improvement are limited due to the small area that drains into the cove. ,'.i/;~~· .. :'.---,.:_ .. -.. -,-_ ·:«x _· .. _ .. -•-:;:·-. ~ttlfili~l?.l,!~J•t~!~l{- PFO -immature red alder with a Himalayan blackberry understory and a sparse herbaceous cover of cattail. reed canarygrass, buttercup, and flag iris; habitat value is moderate due lo adjacency to the lake; provides potential habitat for amphibians, passerine birds and limited wa1erfowl nesting -observed wildlife use includes Canada goose, beaver, several s ecies of serine birds. PFO -red alder with a hardback and Pacific willow shrub layer; habitat value is moderate due 10 adjacency to the Jake; provides potential habitat for amphibians, passerine birds and limited waterfowl nesting, observed wildlife use includes Canada goose, beaver, several species of passcrine birds. PSS/PEMIPOW -black coltonwood saplings, cattails and soft rush; perennial open water; low habitat value due to low vegetative diversity and isolated nature of area; observed wildlife use includes Canada goose, and mallards. PSS -small wetland within former industrial area dominated by cattail, Pacific willow and red-osier dogwood; overall habitat value is low; observed wildlife use includes red- win ed-blackbird, sni e. PEM/POW/PSS-cattail. Himalayan blackberry, red-osier dogwood and red alder sapling; emergent vegetation established after 1990; habitat value is moderate due to adjacency to the lake: provides potential habhar: for amphibians, passerine birds and water fowl; observed wildlife use includes turtles (painted and sliders); beaver, red-win blackbird, mallards. A portion to be excavated and replaced· with clean material; remainder to be capped with 3 feet of clean material. A portion lo_ be excavated and replaced wilh dean material; remainder to be capped with 3 feet of clean material. Excavated and replaced witl1 clean material. A portion to be excavated and replaced with clean material; remainder to be capped with 3 feel of clean material. Most to be excavated 3 to 6 feet and replaced with clean material; remainder excavated to 3 feet and replaced with clean material. Minor portion to south along shoreline may be retained. February 17, 2()()() ASSOCIATED EA.R11l SCIENCES, INC. Page 33 ACK/jlt/ld • KB99J42A57 ·W-D:Vd12·00· W2K ,,,,_00 ,t-~0 ~'rs ~~ \· i fi' I ~/ 5/ ~I or 0) . 0:: I '< I :r: . o: I I!:!. ::, ' ol I 5f' ·:::i'()"f 00 oo«- <P '(,v-i«-. o'l' GYPSY SUBBASIN DRAINAGE (UNAFFECTED BY REMFOIATION) ,/'' / ·-. -----.IA, / v··i;:, I,'-. c:/f! / / . ·, .. , o~P,· ···,., .. ;:..«-• "·-- ,' . .... / <J-_;/ _/_-· ·,., . // -•,\ I. / J -v' --/ ~~WETLAND / / ('F-1· ·-... D-· I '·--· \,)?.\ . 0'> -/ ~ t • .. _. _..-.. _, /_ I !L i • , •r i ~ ,, I x--, / . WETLAN~''' f'..) /,i)/ r~m® . ' i \ ~:J. '. ~ ~. 1 ,-\..-_/ i." / // --~-/ --" --• t'J-' I ~-_....../,,···:-. L...'/ \\(~:?<;~~·:--<·-.. ·. Qj/-' .y.,-,,,_.,,.,,·.. / . -·,\·~~{::·.\· >: :· . ·-. /./;1 _ ';>·.-_,;/WETLAND ,. /' _ I .. . ".. . I --.. -,, . -,-' -8 ' , ,/·. ,, V ;~~-i;--) WETL_ AND -. ,; ,i:;!/ . .0:<·-) • C . [:}"- ·-~:,~'.,>/ -. . df ·:0 a ~1:-2::-::-:}it';:/ I YY.E_TLAND A / '\/,~,,,.V\.t' r LEGEND Area of remediation impact along the shoreline Wood vvask~ >S0 1}b removed with dredging Potential 1-foot sediment cap Dredge to 6' and replaced witt1 clean material to original grade rJredge to 3' and replaced with clean rnate1 ial to original grade 3' cap witl1 clean malenal or cap with redevelopment Excavated to required depth tu remove contaminants and replaced with dflan material to capped gracle Blackberry Shn 1bs frees NOTE ALI. HABITAI. WETLAND AND PROJ~C"f FEATURE LOCATIONS AND QUANTITIES /\RE APPROXIMATE -------_JI ~ • ... · -----r ~·:a!-· ~ .· -. ~--··-· .,_~ ~ I ~ ~,,,. ~fr --~·-. I; APPROXlMATE SCALE IN FEET l I ,' . . ,4/7 1 ' { g ~·· /\'¥..' ~-!, -,.,. .. l . _ f~;'Y tC. 1 /r<<·' ' /;· ,, -· ., >,... NORTH o iCO :a:o m .r:o • " WETLANDS AND SHORELINE VEGETATION QUENDALL AND BAXTER PROPERTIES REMEDIATION FOOTPRINT RENTON, WASHINGTON FIGURE 3-1 DATE 9/24/99 PROJ. NO. 1(899142A ~ , \"<?:->/ 0 ~ 00 0'r)/ :,.,<v'?-/ o0'/ /""' ,./' ·, GYPSY SUB ./ ~ (UNAFFECTEt~SIN DHAINAGE.· \ t\ ~ y RE~WATION)< ~::~=~ / I / .. -' -. -""' . ~/' -; /~--~--~"".:, •• 't _; ~ ---,,-===~ *~"/ / r,r,::==-~----'. ---____ _:_.;_-··==:~ o•.Y ,:,xC~-i-:-)7 / / /~ ·=.:::--=:=··-· :s:;.~ __ ::~/,, --/ '/~5'':'-'' --=--c// - ' /~// -~-.1.-----.....:~=0:0.::::~.:==~~.,/ .. /----/ / -,cf~"'=-c=-~ -: 1 ~--X -~~=== , /< ) -,>/ ~--:_·:~~-c._-;' ( -, ,----r1 / x..O~ ~~0 ~'rCj ,s-*-<v I f -·~--=:~J~-/1 / -i / ~::---~l~~~7,/' :t . . -----~¥.·j / / Cl:: . • -. ·--·--=-r./ .. § ==-·--·--~1tf-.l I • ;,; -"'I. ;;g; / -------· -··· -·--1 ./::/'" / I ' . / ,. 1· /' .. / ;· I / / :, ... · ; ,-' / / //.' i/.. ;/Jl//- f .. J(, _i//.!T ,.;j ,;,/i~'::::;{~ . i .jM;, }_ ,r . f':"f.• ill! i I WETLANDS AND SHORELINE STRUCTURE QUENDALLAND BAXTER PROPERTIES REMEDIATION FOOTPRINT RENTON, WASHINGTON VvVV'V ,.:.. .. ;l•-; i, ·1 i Jll: C '• " (-.· -;.,;~, - lo.C.-'<..\•·.~.i ,.,.,.--,,. LEGEND Area of remediation impact along tile sl1oreline Wood waste >50% removed willl dredging Potential 1-foot sediment cap Dredge to 6' and replaced with clean material to original grade Dredge to 3' and replaced with clean material to original grade 3' cap with clean material or cap will1 redevelopment Excavated to required depth to remove contaminants and replaced wit11 clean material to capped grade Beach Vertical dirt Rip-rap Undercut Log bollard Logs in lake NOTE: /\LL HABITAT, WETLAND.AND PROJECT FEATURE LOCATIONS AND QUANTITIES ARE APPROXIMATE. ~ NORTH 0 10) ZY.l X() 4'.X.l APPROXIMATE SCALE IN FEET FIGURE 3-2 DATE 9124/99 PROJ. NO. KB99142A 1} ~ 2 <;; i i "'o'0 ~0 ~"('?~ v"<-+-<'(., >-ft: I ~, QI ?I -.:;; : ~' o• Q) i 0:: i Oi a:, ' ll'. <a' . :J:: I !l:: I ~i ::, I O' ,- \ 'y-0- ,:,}"'° c,P di· ,/!5 0"' y_,'<- o'C)"' - ,// GYFSY SUBBAS!N C-f~AINAGE (UNAFFECTED BY f'Fi·.',EDI/\T/ON) ,,,/ \~ .. ', ......... ......... , '-. "\"\ _, ' ,,\ / 1,/ _J I J1n11 '. '' -~ r. ·.cc __ ,."_WETLAND • _ 1--,--D )ruu \(-:<--\ r · -. ''<._', ;,,,·) 1'~~-: '.;' ~/ f/ I ! I / ·-C. ·:·ftZ=:-i;}----•7 WETLAND A ~/>, .· ~.{r·-::.::~~~-·; ·> '"E _'-.._.( / ..... 1 ,v,"TLAND -· (',.J E r~/ ~/ '/ /1· . ,~1 _· .· _· ~/ .\, I ~I ~/ .-~-' CT t~: --. -~~~--,---t~:~ ,=~ -~----=---~-- ~ ~k' f~ . --~ .... M JI.-' f, ' y i I~ if ~;__ k:c C ~,, r WETLANDS AND SHORELINE SUBSTRATE AND DEPTH QUEND/\LL AND BAXTER PROPERTIES REMEDIATION FOOTPRINT RENTON, WASHINGTON --------------------------------------- '<. \-'VV --'i>A~9'1- - ~-----~,.,i'.~.:Zi._-:=-. LECf:ND 1\rea of r2rnecl1c1tio;111np,x.:t alo11u 11·1e shmelir·1e \Nood wc1sts >50'J,'i) rnrnovDd wi\h dredging Polen'tic:1J ·/-foot sed1rnent C.dp Dredge to 6 and repL::1ec::d with d1,:nn material io original 9radE-:: Dredge io 3 ancl replacecl witl, clean material to original grade 3' cap with clean material or cap with redevelopment Excavated to required depth to ren1ove contaminanls and replaced with clean material lo cappec! grade SIJ!:lSIJ-l/\T.!: Mud silt Sancl Grov•c:l >50% wood chips DEPTH 0-1 foot 1-2 feet >2 feet NOTE Al J HABITAT. WETLAND. AND PROJECT FEATURE LOCAl IDNS AND QUANTITIES ARE APPROXIMATE ,A._ NORTH 0 ICO _ Z0 3)'J lf:(.J .A.Pt'ROX!/if;TF SCAI F IM FEE1 FIGURE 3-3 DATE 9/24199 PROJ. NO. KB99142A Quendall anil Baxier Properties M/Jigation Analysis Memorandum 3.1.3 In-Water One-Foot Sediment Cap If Ecology determines that Jess than 50 percent woodwaste areas require remediation, these areas would be capped with one foot of clean sand. These areas are indicated as a "potential" one-foot cap in Figure 3-1. No impact to nearshore, partially submerged logs that provide resting platfonns for waterfowl and turtles, or to other features along the shoreline and water interface, are expected due to this potential action, other than the staging areas within the impact zones shown in Figure 3- 1. 3.1.4 Dredge Offshore Areas with Greater Than 50 Percent Wood Chips No impact to plants or animals will result from the removal of material with greater than 50 percent wood chips. Although approximately 7,666 square feet ofmilfoil will be removed, this is considered to be a positive impact. 3 .1.5 Upland Soil Excavation and Capping In addition to the removal of shoreline vegetation shown in Figures 3-1 through 3-3, all upland vegetated areas on the Quendall and Baxter parcels, including Wedands C and D, will be eliminated with this action (Table 3-2 and Figures 3-1 through 3-3). The narrow band of existing shoreline vegetation on the Baxter site that is excluded from the shoreline impact zones in Figures 3-1 through 3-3 will be retained. The upland vegetation removal will eliminate all current wildlife use of the Quendall and Baxter parcels upland of the shoreline areas. Snipes, Canada geese, and some passerine birds have been observed using these sparsely vegetated areas. Osprey nesting in the area could be impacted by the remediation activities. However, the osprey successfully nested on the adjacent active mill site in 1997, indicating that high levels of activity and construction-level noise would not necessarily impact osprey nesting in this area. The occasional use of the osprey nest platform on the Puget Sound Energy cable station pole by bald eagles during the winter could be eliminated during remediation activities. As a result of this very limited use, remediation should not affect bald eagle foraging. The closest known bald eagle nest site is approximately '% mile west of the site; therefore, the project will not impact nesting bald eagles. Capping over the piped section of Gypsy subbasin drainage on the Baxter site would not preclude any mitigation potential the drainage may represent to future development after remediation. Gypsy subbasin drainage is.not included or needed to reasonably mitigate remediation as proposed in Section 4. 0. 3.2 Fisheries Impacts 3.2.1 Shoreline Disturbance Shoreline disturbances affecting fish habitat include complete removal of all vegetation along 660 feet of shoreline, removal of all nearshore woody debris along 1,045 feet of shoreline, 100 percent filling of Wetlands A and B, the two wetlands adjacent to the lake, and dredging of "Baxter Cove". Onshore capping activities are not expected to impact shoreline vegetation. February 17, 2000 ASSOCIATED EARm SCIENCES, INC. ACK/jhlld · KB9YU2AS7. U).D:1/d\2-00 · W1K Page 37 Quendall and Baxter Properties Mitigation Analysis Memorandum Existing shoreline vegetation provides little habitat value for fish. Removal of all vegetation however, would further reduce nutrient input to the nearshore, decrease primary productivity for the area, and decrease the already minimal overhanging vegetation (i.e., refuge) component. Removal of the two wetlands A and B would result in lost lakeshore habitat complexity including small patches of emergent vegetation, shallow nursery areas, and overhanging trees. Approximately 280 linear feet of shoreline wetland would be lost. Approximately 120 feet of wetland at Baxter Cove would be severely impacted. Resulting shoreline vegetation conditions are shown in Table 3-3. Shoreline disturbances would be expected to discourage fish use of the area and possibly impact near-shore salmon migration habits. Both macro-and microinvertebrate populations would be impacted by loss of productivity from nearshore vegetation. ' 3.2.2 Dredge Offshore (PAH) Offshore dredging of contaminated materials would result in immediate and severe direct impacts to benthic fauna during dredging activities. Work along the Lake Washington shoreline below the ordinary high water mark (OHWM) could affect juvenile i;almonids. Salmonid eggs began hatching in the rivers and streams draining to southern Lake Washington in January and February. The resultant fry outrnigrate and begin reaching the lake in early February. Their northern migration towards the ship canal and eventually the Puget Sound begins soon thereafter. Most juvenile fish are gone from the southern end of the lake by early June. Dredging would avoid critical salmonid periods as advised by the WDFW. Resident fish use of the area would be curtailed during dredging, and for a short time thereafter as the disturbed sediments settle after dredging equipment withdraws from the site. Little beneficial habitat exists in the dredging areas, thus no long-term negative impact is expected from the activity. Overall, dredging of these most highly contaminated sediments are expected to have a net long-term benefit on fish habitat in the area. Once the dredged areas are refilled to their original contours with clean sediments, sized similar to the original material, the areas are expected to be rapidly recolonized with benthic invertebrates and flora, and shortly thereafter the larger species which prey on these organisms. Contaminant exposure risk to the fishery should cease as a result of dredging, increasing the habitat value to aquatic species. 3.2.3 Dredge Offshore (Wood Chips) Dredging of wood waste would result in immediate and direct impacts to the minor benthic population present within locations exceeding 50 percent wood coverage. Fish use of the area would also be curtailed during dredging, and for a short time thereafter as t11e disturbed sediments settle and dredging equipment withdraws from the site. Timing of dredging activities would affect expected impacts as tl1e area receives higher use during certain times of the year (e.g., sockeye migration periods); however, dredging would avoid critical periods as advised by WDFW. February 17, 2000 ASSOCL!TED EARTH SCIENCES, INC. A.CK/jliltd • KB99/42A51-W-D:l/dll-00 · WZK Page 38 Quenda/1 and Baxter Propenies Mitigarion Analysis Memoramlum Table 3-3. Valuation of Physical Shoreline Characteristics as Fish Habitat and Mitigated Condition Following Remediation (3,130 feet surveyed April 11, 1997). wJi-'iiH~tistit' ·.·. .-. ··''·, ... ,, "tuirfii!':¢J!n~{ijii~ ,g If t,D/tisWit:1M1t~fiv~1~ftJW5E) ;/ij(~i~t~ii .• q~iitij9~[Y: Vegetation Shrubs dominated by Low growing vegetation including Non-vegetated and non-native Scotch grasses and shrubs provide blackberry covered broom and Himalayan overhanging visual refuge for fish, shoreline would be blackberry to the bank stability, insect habitat (prey reduced by 23 percent exclusion of native item), and shading; trees provide and 28 percent species; small similar functions plus source of respectively; native trees hardwoods; relatively large woody debris, and planted along 50 percent homogeneous structure. overhanging banks when rootball of the remediated is undercut. landscape; native shrubs planted along 50 percent of the remediated landscane. Bank Type Beach type shoreline Historically the lake shoreline was All artificial structures dominates. primarily low-gradient beach removed from the Anthropogenic features habitat formed as the delta of May remediation area; (e.g., piers, bollards, Creek; large woody debris (LWD) wetland mitigation along etc.) are also common near beach may provide juvenile shoreline fronted with (33 percent). Eroding salmon refuge. Alternative beach type habitat dirt along shoreline al shoreline types (e.g., bollards, (Figure 4-4); beach southeast. riprap) provide some diversity and habitat increased by I 0 rearing habitat for juvenile percent; non-wetland salmonids. graded more steeply (Fi~•res 4-2 and 4-3). Bank Protection Approximately 33 Fallen trees along the shoreline Anthropogenic structure percent anthropogenic provide bank stabilization as well reduced to 22 percent; structures; floating logs as quiet backwater rearing habitat percent log coverage along 81 percent of for juveniles. Logs enhance remains the same. shoreline and in shallow primary productivity in nursery nearshore lake areas. Rocks and rootwads environment. provide refuge and habitat diversitv. Substrate Dominated by fine Clean gravels provide potential Substrate returned to materials including sand spawning habitat for salmonids as original grain size and and silts (J9 percent); well as macroinvenebrate habitat; grade; wood waste graveled substrate finer materials anchor vegetation eliminated in most around 12 percent of and are preferentially inhabited by areas. shoreline; abundant other aquatic species; dense wood wood chips in areas (16 chips provide no benefit. 'l"U'rcent). Depth Mostly (57 percent) Juvenile salmonids prefer No change in depth very shallow nearshore nearshore shallow habitat at night; characleristics from environment ( < 1 foot deeper areas provide adult holding existing conditions. within 5 feet offshore). and refuge especially when Oceasional deeper combined with overhanging banks areas. or other complex structures. Intermediate deaths for ve2etation. February 17, 2000 ASSOCIATED EARTH SCIENCES, INC. ACKl}hlld . KB99UV.$7 · lD·D:l/d\2-fJO · W1K Page 39 Quendall and Baxter Properties MftigaJion Analysis Memorandum Areas to be dredged of wood chips are commonly associated with highly anaerobic conditions (RETEC, 1997), thus little beneficial habitat currently exists in the dredging areas. No long-term negative impact is expected from the activity. Dredging of the wood chips is expected to have a net long-term benefit on fish habitat in the area. The areas are expected to be rapidly recolonized with benthic invertebrates and flora, and shortly thereafter with the larger species which prey on these organisms. Ecology specifications for cleanup standards should prevent sublethal impacts to the fishery from the wood leachates and anaerobic chemical processes after remediation. 3.2.4 Upland Soil Excavation and Capping Upland soil excavation and capping activities have the potential to introduce sediment to Lake Washington. Excessive sediment introduction can result in reduction of nearshore habitat availability: Excessive fine sediments can elevate turbidity which can have a detrimental effect on fish communities. High turbidity can impact fish directly through changes in behavior and physiology, or indirectly by decreasing food supply and habitat availability. Behavioral modifications include cessation of feeding and outmigration. Physical reactions include excessive mucus secretion, excretory interference, and respiratory complications resulting in possible suffocation (Redding et al., 1987). An erosion and sediment control plan would be developed and implemented to contain all significant sediment sources, thus no significant impacts to fish resources should be expected from the upland activities. February 17, 2000 ASSOCUTED EARTH SCIENCES, INC. ACKl}hlld-KB99142,t.f7. W·D:\ld1l•OO· W2X Page 40 Quendall and Baxter Properties Mitigation Analysis Memorandum 4.0 MITIGATION The wildlife habitat within the remediation area is primarily found along the shoreline. The goal of the wildlife mitigation is to expand and enhance the plant communities and other habitat features (e.g., down woody debris) along the Quendal! and Baxter shorelines. All wetlands on the Quendall and Baxter parcels are Class 3 wetlands (per City of Renton categorization) that require replacement at a 1: 1.5 (impact:restoration) ratio by the City of Renton. Wetland communities would be replaced with higher value Class 2 forested wetlands in two areas. The northern area would include the present location of Baxter Cove (Wetland E). The southern wetland mitigation site would be a large complex along the southern Quendall shoreline. Wetland hydrology would be primarily controlled by Lake Washington. Vegetation and logs would provide shoreline protection as found under current conditions. Water quality functions would be limited in these wetland systems due to the limited area that would drain into these wetlands, similar to existing wetland·conditions. The biological support provided by the wetland mitigation areas is expected to be greater than currently provided by the five wetland areas (A through E) that would be impacted by the remediation because two large and enhanced wetland areas would be linked by a restored 100-foot vegetated shoreline. Tire resulting habitat would also support greater vegetative diversity and structure than current conditions, including an overstory conifer component. Conceptual mitigation actions are summarized in Figure 4-1 and discussed below for each remediation action. Wetland mitigation is not proposed along intact portions of the shoreline unaffected by remediation (for example, northern Baxter) or in areas of Quendall with extensive monitoring requirements under the cleanup action plan. Shoreline enhancement and restoration has been placed where the shoreline will be impacted by the remediation (Quendall shoreline north to Baxter cove). A trail north to south with perpendicular extensions to controlled outlooks landward of the OHWM is expected with subsequent development of the site. A trail is not proposed as part of the remediation mitigation. Nonetheless, mitigation enhancement for the remediation is considered to constrain any future trail and public access as follows: 1. The main north to south trail would be landward of the buffer. 2. Perpendicular trail extensions to controlled Lake Washington outlooks would be allowed to extend into the buffer, with buffer widths extended to make up the area lost to the trail. 3. All access would be controlled to within the trail and outlook system, using some combination of dense or thorny native vegetation or fencing. Signs would be posted indicating the wildlife value of the buffer, indicating ownership, and restricting access. 4. The buffer perimeter may be averaged. February 17, 2000 ASSOCIATED EARTH SCIENCES, INC. ACK!jhlld • KB99l42A$7-LD-D:\k/11.()() · W2K Page 41 t ~ 1 c, ~ " .. S'. l'.> !-' 1~ j' [: fi ~ 0'r0- 0V~ 0 RP0- 0'r~ ~<.c,0- o0 LAKE Vi!/\.SH!NGTON OUTER HARBOR BOUND/,fl.,;,,Y-----..... r,:.,1'.07' ~ ............ c5') r-------------'"''" .. . , oNR 9'"NERSH1P \ 1:,:_..c 1 ~-,:R~~,t~:" E.)FFEf, ,,•1-r•~co,. ,"·l::ri .... -...,_ ~ f\.OSJ-,-,, Wl-!"LAl•iC CRE:..il/ /(.if.! t.RE./, /I.PP.RC.\ (i 4f AC i ouENDALL ~ -~ - 50.-f'~ SHCRELINE 8Uf"r r;;; (AVERt..Grn: CONCEPTUAL SHORELINE AND WETLAND MITIGATION PLAN QUENDALL AND BAXTER PROPERTIES REMEDIATION FOOTPRINT ~ <.!\ 0,•.s ~(-·· \} '\/>'0, }-1', '1, () 6 '? .. -,~ 'Yq. 6?,'>'o~ i/', (.°" !L_,;_\ /qb \ ' ·-\;-------------.; /) \ B8XTEB ~ v"rJ:s,~ 0 100 200 3JO 400 APPROXIMATE SCALE IN FEE, FIGURE 4-1 DATE 9124199 -------------------------------------_..!:Rl!aE'~.TON. WASHINGTON PROJ NO. KB99142A Quendall and Baxter Propenies Mitigation Analysis Memorandum 4.1 Plants and Animals 4.1.1 Disturbance to Quendall Shoreline and Loss of Wetland C The goal of the Quendall shoreline mitigation is to replace existing vegetated shoreline areas {including Wetlands A & B) and Wetland C with similar or enhanced vegetated/habitat conditions. The following actions will be conducted to mitigate for shoreline wildlife habitat impacts: Establishment of an averaged I 00-foot-wide zone of native plant communities along the impacted shoreline that is currently only poorly vegetated or lacking vegetation. Shrub species will be established along most of the revegetated shoreline (Figure 4- 2). Trees will be established along at least 50 percent of the shoreline and cover at least 50% of the wetland restoration areas {Figure 4-3). Plant diversity will be increased from current conditions. A list of plants proposed for the restoration plantings are provided in Table 4-1. Wetlands A. B, and C will be replaced with enhanced functions on a I: 1.5 area (impact:restoration) in one wetland complex associated with Lake Washington in the current location of Wetland A, totaling approximately 1.11 acres (Figure 4-4). The length of the wetland complex along the shoreline will at least equal current shoreline wetland area (approximately 395 feet). The creation of one larger system comprised of more diverse communities (e.g.; conifers) will increase wetland value. Wetland hydrology will be controlled by lake level during the summer and stormwater release from the developed project during the winter, and is thus guaranteed. • Vegetation species composition and diversity will be increased in the wetland buffer from the current condition. The wetland buffer will be expanded from 25 feet to 50 feet because the newly created. wetlands associated with the lake would be classified by the City as Class 2 wetlands, rather than having the existing Class 3 status. The increase in buffer width reflects Renton's requirements for the improved wetland values. • Woody debris will be placed in all re-created shoreline habitats, including replacement of logs as necessary along the shoreline. • Wetland and buffer slopes would average 4:1 or less in most areas, although some banks may rise more steeply to provide diversity in limited areas so long as erosion risk can be avoided. • If contaminated material removal coincides with wetland placement, one or two snags could be installed where clean fill is placed. Febmary 17, 2000 ASSOCIATED EARTH SCIENCES, INC. ACXljhRd -KB99l42A5'1-LD-D:lld\2.00-WlK Page 43 QuendaU and Baxter Properties Mitigation Analysis Memorandum Table 4-1. Plant Species Proposed for Planting within the Wetland and Shoreline Buffers J"''''',. SCIENTIFJC•NAME'e< ·.:,'._.:.'.-.'.i,'.;·;'.•-,' .. ·,'.' .. •.• .• /.' ;•_: .\···-;;._-,_.,;,,,·-:: '.',•,:;.,,:-:•:.;,-,-· ,:, .. :,:,-.. , · .. ,.-,,;~., Shallow Emergent Wetland Cara obnupta slough sedge Care>: stipata saw-beaked sedge Eleocharis owua ovid spike-rush Juncus. oxymeris pointed rush Sagiuaria latifolia broadleaf arrowhead Scirpus micnxarpus smalJ-fruited bulrush Veronica Americana american brooklime Deep Emergent Wetland Alisma plantago-aquatica water plantain Scirpus acutus hardstem bulrush Scirpus v(l.[idus softstem bulrush Cornus sericea red-osier dogwood Lonicera involucrau black twinberry Physocarpus capitatus Pacific ninebark Pyrusfusca western crabapple Rhamnus purshiana cascara Ribes lacuslre swamp gooseberry Rosa ,iutkana Nutka rose Rosa pisocarpa pea•fruit rose Rubus spedabills salmonbeny Salix lucida var, lasiandra Pacific willow Salix sitchtnsls Sitka wi1Jow Felm,ory 17, 20(/() ACKQW • KB99l42A$7 • LD·D:\Jdll·OO • W2K ASSOC/A 1W EAll:11! SCIENCES, /PC Page 44 Quendall and Baxter Propenies Mitigation Analysis Memorandum Table 4-1. Plant Species Proposed for Planting within the Wetland and Shoreline Buffers (continued). Fore5ted Wetland Fraxinu.s latifolia Oregon ash Picea sitchensi.s Sitka spruce Populus trichocarpa black cononwood 11uifa plicata western redcedar Upland Forest (trees and shrubs) Acer circinatum vine maple Acer macroplryl/um bigleaf maple Arbutus meni.iesfi Pacific madrone Berberis {Maho11ia] spp. Oregon grape Comus ml11allii Pacifc dogwood Gaultheria shallon salal OemJeria cerasiformis Indian plum Pillus contona shorepine Populus tremuloides quaking aspen PrUllttS emarginata bitter cherry Pseudotsuga menziesii 1J1uja plicara wes1ern redcedar Tsuga heterophylla western hemlock Upland Shrub Acer circinatum vine maple A~lanchler a/nifelia serviceberry Corylus cornuta hazelnut Rosa spp. rose Rubus parvjftorus thimblebcrry Salix spp. willow Symphoricarpos albus snowberry February 17, 2000 ASSOCIATED EART1f SCTENCES, INC. ACK/jh!ld. KB99U2A5'I-lD-D.-Ui/11-(J{) • W2K Page 45 NORTH,SOUTH I· TRAIL • l (Outside Outer Edge of Buffer) 100-Foot Averaged Shoreline Buffer Shrub planting! interspersed with grassy openingi & oCCllsional upright deciduoos tree (i.e. quaking aspen). woody debris placement SHORELINE ENHANCEMENT CONCEPT (SHRUB-DOMllfATED CROSS SEOION) Overbo ng at shoreline edge with red osier dogWllod develop shallow & deep emeigenl plant communities as lake lerel fluctuation allows FIGURE 4-2 DATE 10/S9 PROJ. NUMBER KB99142A i1 NORTH-SOUTH TRAIL I· ~ (Outside Outer Edge of Buffer) 100-Foot Averaged Shoreline Buffer Plant native species near the shore,ine end transition to horticultural/non-native species os needed to blend into theoveroll site landscape pion OBSERVATION/AREA VIEWPOINT {Typical, Reached By Perpendicular Extensions From Main Trail) SHORELINE ENHANCEMENT CONCEPT (TREE-DOMINATED CROSS SECTION) "' "' ,-c , .... : ~ Selectively place woody debris within the near shore native species planting area i ~ to provide additional wildlife habitot structure using both deciduous and 'iii coniferous logs ronging from 4" to 36" dbh. Snags could also be installed. i /Provide overhang at shoreline edge with native willows and red osier dogwood : r Develop area of emergent vegetation [i.e. bulrush, arrowroot) as ' allowed by lake level fluctuation. O.H.W. FIGURE 4-3 DATE 10/99 PROJ. NUMBER KB99142A WETLAND BUFFER ZONE-MIXED UPLAND 10RfST HABITAT~ Provides shade & microdimate buffering, large woody debris and organic nutrient source (leof litter), bank stability, food supply (inseds), as well as wildlife habitnt (nesting, feeding). SO-Foot Averaged Buffer • · I 50% Tree Cover/ Welland WETLAND AIIEA• emergent vegetation, anchored LWD to provide fish muge hobitot, shode, nutrimts, etc. LAKE WASHINGTON Log 1 CONaPTUAt WETLAND DESIGN FOR LAKE WASHINGTON SHOREUNE I( I High Lake Level ( l Low Lake Level j FIGURE 4-4 DATE 10/99 PROJ. No. KB99142A Quendall and Baxter Properties Mitigation Analysis Memoromlum 4.1.2 Excavation of Baxter Cove {Wetland E) and Loss of Wetland D The following actions will restore wetland habitat in an area centered around Baxter Cove: • Turtles currently existing in Baxter Cove will be live-trapped and removed to nearby areas in Lake Washington containing suitable habitat. Dispersal areas will be identified in conjunction with County and WDFW wildlife biologists. When remediation has been completed and Baxter Cove has been replanted, attempts will be made to capture turtles from the dispersion areas and return a small population (6-12 individuals) to Baxter Cove. , Dredged areas will be filled with clean material of a similar grain size and to elevations similar to current conditions. This will recreate a hydrologic regime that supports open water and emergent vegetation components. The area_ will be replaced with suitable clean fill material. , The Baxter Cove wetland area will be expanded by excavating additional areas (to a total of approximately 0.46 acre) to provide a 1 :1.5 forested wetland replacement for the Baxter Cove wetland (Wetland E) and Wetland D. • Logs will be partially buried and/or anchored along the lake shoreline at the mouth of Baxter Cove to stabilize the shoreline and provide resting platforms for turtles and waterfowl. • Logs will be floated across the open water mouth of Baxter Cove. Large down logs will be placed in the wetland perimeter. • Shallow and deep emergent wetland species will be planted to establish an emergent plant community with greater diversity than is currently found in Baxter Cove; a bench to appropriate depth for shallow emergents will be constructed during regrading with clean fill after the excavation is complete. • Obligate and facultative wetland tree and shrub species will be planted at the wetland perimeter. A 50-foot forested and shrub upland buffer will be planted, with a slope of 4:1 or less throughout most of the buffer. Trees will comprise at least 50 percent of native canopy cover in areas where tree and shrub communities are established. An osprey nest platform will be erected in the buffer if the cable station nest platform is removed during remediation. 4.1.3 Dredge Offshore Areas with Greater Than 50 Percent Wood Chips No mitigation action required. The remediation will improve the existing condition and restore the lake bottom to its original contours. February 17, 2000 ASSOCIATED EAR111 SCIENCES, INC. ACK/jhlld · KB99142A57 • W-D:\Idil.(X)-W2K Page 49 Quendall and BaxJer Propenies Mitigation Analysis Memorandum 4.1.4 Dredge Offshore PAH Areas No mitigation action required, other than replacement to original contours with clean material of a similar grain size. 4.1.5 Upland Soil and Excavation and Capping Wildlife habitat impacts will be compensated by habitat created along the shoreline. This will include: Replacement of Wetlands C and D on a 1: 1.5 area basis in the two wetland complexes associated with the shoreline restoration (as discussed above); • Enhancement of the vegetation species composition and diversity of the wetland and wetland buffer from the current condition (Table 4-1 and as discussed above); • Placement of woody debris in wetland and associated buffers. As a result of these mitigations, the following improvements would result: • 1.05 acres of existing degraded Class 3 wetland replaced by 1.58 acres of replaced Class 2 forested wetland hydrologically supported by Lake Washington; • Approximately 53,500 ft.1 of degraded shoreline vegetation (including wetlands and buffers replaced/enhanced by approximately 115,000 ft.1 of shoreline vegetation and buffers;· • an average 100-foot Lake Washington enhanced shoreline buffer, in excess of the Renton minimum code requirements of 50 feet (commercial) or 25 feet (residential). 4.2 Fisheries Mitigation Fish habitat mitigation for remediation impacts would take place along the shoreline and is closely integrated with wetland mitigation activities. Mitigation planning was directed towards creating a high quality nearshore rearing environment as the first priority. Physical shoreline characteristics and the final mitigated condition are shown in Table 4-2. 4.2.1 In-Water Work Timing To minimize impacts to sensitive fisheries resources, the timing of work in Lake Washington and along the shoreline below the ordinary high water mark will avoid the annual migration of juvenile salmonids (see Section 3.2.2). To protect the juvenile runs from physical disturbance and short- term turbidity, the Washington Department of Fish and Wildlife recommends no in-water work in southern Lake Washington during the period from February 1 through June 15. Therefore, February 17, 2000 ACK/jhlld • KIJ99l42AS7 · W·D:Vd\2-00 • W2K ASSOCIATED EARTH SCIENCES. INC. Page 50 Quendall and Baxter Propenies Mitigation Analysis Memorandum dredging and clean sediment replacement on the lake bottom and all work below the OHWM along the shoreline, including Baxter Cove, would be conducted between June 16 and January 31. Water quality protection measures are described in Section 4.3. Additional details required to protect species listed under the federal Endangered Species Act will be provided as necessary during the biological review process for those species. 4.2.2 Shoreline Disturbance Vegetation removal resulting from the remediation activities would be mitigated by replanting the nearshore environment as described in Section 4.1. The riparian width would vary, but would average I 00 feet. A minimum of 50 percent of the remediation shoreline buffer would be planted with low growing native groundcovers and shrubs. Together with the existing sluubbery remaining outside the remediation area, the total linear distance of sluubs would include 1,490 feet of shoreline. Plants along the shore would be selected to maximize overhanging vegetation and provide bank stability. Compatible species would be planted in those areas converted to wetland from the existing conditions. A minimum of 50 percent of the remediation shoreline would be replanted with trees for a total of 1,135 feet (tree planting would be concurrent with other shrub and groundcover vegetation). Trees close to the waterline would be selected to provide similar functions to those described for the shrubs. Mitigation for loss of nearshore wetlands was described in Section 4, 1. Enhanced wetland habitat along the Baxter shoreline will replace areas with relatively poor fish habitat conditions (e.g., vertical dirt banks, abandoned structures, rip-rap) with a vegetated gently sloped shoreline. Wetland replacement would result in increased low-gradient shoreline and a more diverse shoreline structure. Reductions in the extent of vertical dirt bank, rip-rap, log bollards, and several industrial structures would be accomplished (Table 4-2). 4.2.3 Dredge Offshore {PAH and Wood Chips) No direct habitat mitigation is proposed for offshore dredging undertaken to remove PAH and wood chip contamination except for re-establishing and enhancing the Baxter Cove shoreline. 4.2.4 Upland Soil Excavation and Capping Potential upland soil excavation and capping impacts would be mitigated to the greatest extent practicable with implementation of an erosion and sediment control plan. No other mitigation is proposed. February 17, 2000 ASSOC/A TED EARTH SCIENCES, INC. ACK.ljh/ld -KB99142AS1 • W-D:Vdl2-00 -W2K Page 51 Quenda/1 and Baxter Properties Mitigation Analysis Memorandum Table 4-2. Mitigated Lake Washington Shoreline Characteristics (3,130 ft. surveyed April 11, 1997) ?,t{t [_,_-_-_-_!,'._:-.,::_i __ ~_--_• __ -_._-_._,_·_._•_•,:-__ ~_--,--,-·-•.·,,~,•-~----_•_--_-,-_,_-."_-_: ___ .:·_;_:,,:_•_,::_,_',·,_:_-_:;:_,::-_,_. ·_ :.-..:•w~~:}: .. _.._.. .,._ 'Y\:,;-'.};£j)t-::. . ' :.fl'A 6"·~ . --:. ·''. · >.-_, ·t»W!i!{~_---1/J!f i.£fiik7: ___ -:::, ;::,/c(._.~:.-, _. _ . ... -C_o~itioii'" -ma,~ ~ ;~ta, ,: ui · , .,,, 'i~;\':Vi -~ _·,,_'.i>;sta,:-·_._--._--•• __ ·_-_,_-._·.-(-_ft· __ --~J._",·_, ___ ._ce.'_·_._._-._.,.-.-_·_--',_-.•-_-_-,,• __ -•• ·.c ____ ._-: •. •-._:,-__ -~-,-_--.-_'(.· __ :_--_.,"_-.·._·--_·,_)_:·-·.-__ -:-.,_ •• _!'_•_'_-,-;·-·._--·.---_--,_-_-·.•.-___ :·;··-.·Ci&,-,_·._ .• -_-_-_-_:,, __ ,<-,_-_-:'-',-____ ----.·J-,"._,_-._-·_-,,·,_--,_'.-'•-,-_-·_ J. '--al ~,, , 'LineOf : .c.li,altio'os ' ,. -f "Z-~ ; rt:'--·. t::if~If~:: --· .. ;· 7P -?:t-{\r .. :-;' ::. ;~~ i%!f ti~} ·-:;~~~-~~-~~J; Ii~-IAff Vegetation nnne 800 26% 1460 47" +83% 75 2" -95% -91% blackberry 1425 46% 1000 32% -30% 540 1711, -46% -62% shrubs 905 29% 670 m, -26% + 1490 48% +122% +<15% ,,.., 770 25% 425 14% -45% + 1135 36% + 167% +47% wetland 535 17% 255 8% .52,i; =I+ 1070 34% +320% HOO% Bank type 1 bead, 805 26% 485 15% -40% + 1120 36'11, + 131 % +3!''% Protection ver1ical dirt 930 30% 7SO 24% -l9'll> 660 21 % -12% -29% riprap 415 13% 335 11% -l9% 335 11 % +Oll -19% hull<h<ad 0 0% 0 -0% +0% 0 0% +0'11, +o'll> log bollard 515 16% 43S 14!11 -16% 285 9% .3411, -45% pier 5S 2" 35 1% -36% 35 1% +0% -36% building 35 1 % 35 1 % +0% 35 1% +0" +0% log skid 35 '" 20 Iii\ -43'1, 0 0% -100% -100% undercut 110 4% 110 4% +0% =I-80 3% -27% -27% inlet 820 26% 690 22% -16% 820 26% +19\:1 +0'11, logs 2550 81 % 1505 48% -41% + 25SO 81 % +69'11, +0% Substra1e1 mudfsilt 755 24% 325 10" -S7% =I· 325 10% +0% .57,i; sand 1685 54" 1080 35ll ·36% =I· 1080 35% +0% -36% graVC:I 690 22% 1725 55" +150% =I+ 1725 55% +0% +ISO% wood was1e3 500 16% 0 0% -100% 0 0% +0% -100% D,plh' 0.1' 1775 57% 1775 57% +0% =I+ 1775 57% +0% +0'1, 1-2' 870 28% 870 28% +0% =/+ 870 28% +0% +0% >2' 485 15% 485 1S% +0% =I--485 15% +0% +0% 1 Bank type assumeS capping docs not affect existing bank. " Measured 01 sampJcd approximately five feet .out from shoreline.; 3 Woodwaste ""' areas where chips and bark exceed 50% 'il)rface coverage. Remediated conditiort assumes lake bed capped to original elevation with matcriat sized similar 10 eiistins conditions. Misigated condition assumes 50'% of dm!gcd shoreline would be replanted with trees, SO% with shrubs, and wetland areas would be rcereated as beach. February 17, 2000 ACX/jhlld -KB99/42A57 • LD•O:\ldt.2-00 -W2K ASSOCIATED EARTH SCIENCES. INC. Page 52 Quendall and Baxter Properties Mitigation Analysis Memorandum 4.3 Water Quality Water quality impacts will not accrue from the proposed remediation and mitigation in the long term. These combined actions are expected to improve water quality over the existing condition. However, impacts in the short-term from implementation of the remediation action could occur if proper temporary erosion and sediment control (TESC) measures are not taken. A synopsis of likely TESC measures that would be proposed as part of the Consent Decree under the Model Toxics Control Act (MTCA) is provided in Table 4-3. 4.4 Mitigation Implementation Schedule 4.4.1 Baxter Property Based on the current projected schedule, the remediation activities could start on the Baxter property sometime in the fourth quarter of 2000. Upland excavation activities, including soil treatment, are projected to be completed within an 80-day period. Baxter Cove remediation activities are estimated to take approximately one month. Capping activities on the Baxter site should be completed within a 90-day period. Under a start date of the fourth quarter of 2000, the Baxter Cove excavation and fill activities would need to be completed prior to January 31, 2001 to accommodate the recommended fisheries window for in-water work of June 16" to January 31". This would allow for completion of remediation activities on the Baxter site to be completed by the first quarter of 2001. The wetland restoration/ mitigation activities in Baxter Cove would begin with the excavation of the areas adjacent to Baxter Cove that would be converted to wetland habitat. This excavation would at least include over-excavation of the planned grade for topsoil placement or whatever depth may be necessary to accommodate remediation excavation. Backfill of Baxter Cover and.the adjacent wetland expansion area would include a least 12 inches of topsoils. If remediation is initiated in the last quarter of 2000, the wetland mitigation area and shoreline areas disturbed by remediation activities on the Baxter parcel would be planted in the spring of 2001. If the remediation is conducted under an alternative schedule the area should be planted late fall, winter, or early spring, if possible. Temporary watering of the plantings would be conducted as necessary to establish the plants. Long-term watering would not be required for these plantings. 4. 4. 2 Ouendall Property Remediation activities on the Quendall property would likely begin after June 16, 2000. Remediation of the Quendall site involves much more extensive in-water dredging than the Baxter site, where in-water dredging is limited to Baxter Cove. Upland excavation activities are also more extensive on the Quendall site than the Baxter site. The materials dredged from Lake Washington would be transported to the upland areas of the Quendall property to be treated on-site or off-site. These materials would likely be brought onto the site just south of Wetland A. Fei,ruary 17, 2000 ASSOCIATED EARIB SCIENCES, INC. ACK/jhlld • KB99UW7• W-D:ltdU.(J(J • W2K Page 53 Quendall and Baxter Properties Mitigation Analysis Memorandum Table 4-3. Mitigation of Short-Term Impacts Related to Site Cleanup Fl~••li A,c~vity·• .··. :e ci .·.•• > ·i&fssible" Midii:;"atfon· A))pi:oach' '\'.Y/)\ :' ·, •',· <· · ... ·.,. ;.::-";:.i:f'·:'.=' \./)(,,f..:" ::;_',", · ;;;,·•• :,:<:?:! ;• :·.;:.":.-. ., , .... :;,(,'•',",· : .'· :·:.· .··,cc.·· •. :······ .·.·.".·.,·.··!,';' ,',;".",", . .".:;'·.· :• ... -··:·;,;.;.· ''·' .·:~ ·,· ... ,, ;.> General Sire Controls Where possible a vegetative buffer wm be left between upland activities and the lake. ln all places, silt fencing will be installed to prevent sediment from entering the lake. In addition, the site will be graded, as nece!sary, to prevent stom1water discharge to the lake (Chapter 173-201A WAC establish waler quality cri1eria). Measures recommended in the 1999 draft Volume II Stormwatcr Management in Washington State will be considered representative of •typical" best managemenr practices (BMPs) for much of the upland site work. E:xcavation and Dewatering E:xcavations will bedewatered, as necessary, to prevent handling of saturated soil excavated from below the water table. Water will be treated and preferentially discharged to the local sanitary sewer with prior permission. If lake discharge is necessary, specific testing regimes and criteria for lake discharge would be agreed with the Washington Slate Department of Ecology (Ecology). Surge capacity will be provided by 1he use of rented storage tanks. E:xcavaled soil will be stock.piled and provided with appropriate erosion and sedimentation controls. Dredging -Baxter Cove Baxter Cove will be hydraulically isolated from the lake using steel $heel piles or similar. Free war er ' will be pumped off for discharge to the sanitary sewer. Excavation will be performed using land-ba~ P1'1UiDment. Dredging -Quendall Silt curtains or screens will be used to control the spread of [Urbidity from dredging. Turbidity criteria under WAC J73-201A-030 can be modified to allow a temporary mixing zone during drc<Jging of lake bottom iialiments, however the point of compliance would not be further than 150 feet from the dredging activity pursuan1 to WAC 173.201A.J l0(3}(d) . .Dredging will be pecfonntd using specialiud equipment (e.g., CahlcAnn'M), 1echniqucs, and dredge rates that limit the potential for generating turbidity and that do not cause excecdances of surface water quality criteria outside the work area. Most chemicals present on-site will be scrongly associated with sediment particles. Surface water quality monitoring will be performed during dredging to ensure no impacts are occurring beyond the work area. This plan would be deveiorui,d as a part of U.S. Armv Corps of Engineers (CO El nermittinv. Sediment Transport and Haul barges for mechanically dredgctl s~iment would be welded waler tight to prevent discharge of free Offloading -Mechanical water back into the lake. Offloading will occur by placing the haul barge as near to shore as possible. (Spillage Prevention) Ofnoading will occur with a clamshell or similar. A spill apron barge may be used under lhe Cl;lllle swinii: area to coltect ....... incidental millal"e. Sediment Transport and Any sediment dredged hydraulically will be pumped direclly to 1he upland portions of the site using a Offloading -Hydraulic pipeline. (~ilJa""' Prevention) Sediment S1aging and Dredged sediment will be contained in barges or upland dewatcring cells or ponds. Free water wiH be Dewatering eolleaed and treated prior to discharge to the sanitary sewer. Dewatering from hydraulic dredging would require discharge to Lake Washington after treatment due to the large volumes it would generate. Upland cells or ponds will be lined. will have a water collection system. and will be constructed with berms to r.irevent run-on or run-off. Off-Sile or On-Site Hauling Entry points to the sire will be upgraded wilh crushed rock or quarry spalls. All 1ruck5 leaving the site will proceed through a wheel wash and any soil tracked onto public roads will be addressed through occasional street washi112. Process waste water could be controlled and k~ ~rate from stonn water. Soil Capping A clean soil cap will be placed over large ponions of the site. The soil will consist of imported clean or lrcated soil. As for general site activities, a vegetative buffer wUI be left becween the soil cap and shoreline to the maximum extent practicable. Other erosion and sedimentation controls, noted above under 2.encral site controls, will remain in 111ace until redevelonment activities commence. Water Treatment Any water collected from soil or sediment dewatering will be treated using some combination of equalization, free-phase hydrocarbon separatlon, coagulalion/Oocculation (for example, polymer treatment), or filtration. Discharge water would conform to standards required by its receiving location. If discharged to Lake Washing.ion, Chap:er 173-20IA WAC would apply. If discharged to the sanitary sewer, Kin2 Countv/M~ standards wou!d annlv. Permitting Treated dewatering water and stormwater discharge will be penniu.ed under a Consent Degree in conformance wioh MTCA (Chapter 70-105D WAC). Under RCW 90.48.039, remediation actions do not require a separate National P0Uu1ant Discharge Elimination System (NPDES)· construction-phase permit; however, there must be compliance with $Ubstanti'Ve requirements of an NPDES permit. A detailed Stormwater Pollution Prevention Plan (SWPPP) will be developed prior 10 implementation of the final cleanup Dlan. February 17, 200() ACK/jlrlld -KB99U2A57 -LD-D:\ldl2-lXJ • WZK ASSOCIATED EARTH SCIENCES, INC, Page 54 Quendall and Baxter Properties Mitigation Analysis Memorandum If all of the remediation activities on the Quendall site are completed within a single fish window opening (June 16, 2000 to January 31, 2001), the wetJand mitigation and shoreline plantings could be conducted in the second quarter of 2001 (assuming a June 16, 2000 start date). If the remediation dredging activities cannot be completed within a single fish window period, the dredging activities would be halted from February 1" through June 15th and be completed in the following fish window opening. Wetland mitigation could not be completed until the dredging activities are completed since the materials would be brought onto the site in the proposed wetland mitigation area (southern Quendall shoreline). If the remediation activities in the northern portion of Quendal! are completed in the first season, the shoreline mitigation plantings, north of the wetland mitigation area, could be implemented in the first or early second quarter of 2001, and the wetland mitigation implemented after the dredging is completed the second year (project first / second quarter of 2002. If not, all wetland and shoreline mitigation activities would be initiated when all remediation activities are completed. Again, plantings would be irrigated on a temporary basis as needed to successfully establish the plants. 4.5 Monitoring and Contingency This section outlines post-construction performance standards, a monitoring schedule, maintenance requirements, and contingencies for the proposed buffer and wetland enhancement project. As proposed, monitoring to document plant survival would occur five times over a 10-year period. Each monitoring survey would be conducted by a qualified biologist. 4. 5 .1 Performance Standards The success of the remediation mitigation effort would be based on the following standards: • Survival of 90 percent of the tree and shrub species plantings and 10 to 15 percent cover for emergent wetland plantings after one growing season. Percent survivorship would be calculated through a direct count of all dead rooted and severely stressed stock plantings within permanent sample plots. If necessary, the reason for the failure of plantings would be determined (i.e., soil conditions, herbivory, moisture conditions, etc.), and recommendations to rectify the problem(s) provided. • Survival of 80 percent of the tree and shrub plantings and 30 percent cover of emergent wetland plantings after two growing seasons within the representative permanent sample plots. • Fifteen percent cover for the tree and shrub plantings and 60 percent cover of emergent wetland plantings within the representative sample plots after three growing seasons. February 17, 2000 ASSOCIATED E.tRm SCIENCES, INC. ACK/jhlld · KB99142AJ7 -lD-D:l/d\1-00-W'lK Page 55 Quenda/1 and Baxter Properties Mitigation Analysis Memorandum • Thirty to 40 percent cover for the tree and shrub plantings and 75 percent cover of emergent wetland plantings within the representative sample plots after five growing seasons. • Forty to 55 percent cover for the tree and shrub plantings and 75 percent cover of emergent wetland plantings within the representative sample plots after 7 and 10 years. • For all years less than or equal to 5 percent cover of non-native,. invasive herbaceous species. 4.5.2 Maintenance A goal of this plan is to establish communities of native plant species that require little planned scheduled maintenance to become established, and require no routine maintenance after the plants have become successfully established. The planting contractor would be responsible for maintaining all plantings for a one-year period after installation before the final project acceptance is issued to the contractor. A temporary irrigation system would be used as needed during plant establishment. No permanent irrigation system would be required once the plants have successfully become established. 4.5.3 Monitoring During the first monitoring survey, randomly selected 5-meter radius plots would be permanently established within the restored habitats to provide a representative sampling of the tree and shrub plantings. One-meter square plots would be established to monitor the emergent wetland plantings. The entire area would be visually inspected at the time of sample plot establishment to ensure that the plots are representative of site conditions. Information on survivorship and percent cover would be collected from inside the permanent sample plots to judge the success of the restoration plantings. Information collected during each monitoring survey would not be of sufficient quantity or complexity to provide a statistical analysis for the project. However, it would be sufficient to adequately assess the success of the restoration efforts. Photo documentation stations would be permanently established either at the center of the permanent sampling plots, or at other locations that provide representative views of the mitigation areas. Photographs taken at these photo stations would be used to document the establishment of planted materials and to illustrate plant community changes within the restored areas. Percent survivorship for the project would be calculated through a direct count ofall dead and severely stressed plantings within the permanent sample plots. Plant vigor would be evaluated using the following categories: live; stressed; tip die-back; and dead. Live plants would be judged to be those with healthy, vigorous stems, and adequate succulent foliage. Plants having sparse or desiccated foliage, significantly damaged twigs, sunburn or sunscald, etc. would be assigned to the stressed category. Plants suffering from significant stem mortality, especially the leader and/or February 17, 2000 ACK!jMd · KB99142AJ7 · ID-D:Vd\Z..00 · W2K ASSOCIATED EARTH SCIENCES, INC. Page 56 Quendall and Baxter Properties Mitigation Analysis Memorandum main stem, would be placed within the tip die-back category. Plants found to support no foliage or live stems would be assigned to the dead category. Severely stressed plants and plants with tip die-back and no healthy basal sprouts or side branches would be considered dead for that monitoring period. During the first year following restoration, monitoring would occur during early spring before lake water levels rise and late summer before Jake water levels are lowered. The focus of the initial spring monitoring survey would be to assess the suitability of the planting location selected for a particular plant species in relation to the lake water levels during the early growing season. Additionally, general observations of wildlife use of the enhanced habitat would also be noted. Photographs would be taken at each of the permanent photo stations during each monitoring survey, and current photographs from these photo stations would be included in the report prepared for that particular monitoring survey. 4.5.4 Monitoring Schedule All monitoring surveys would be conducted by a qualified biologist. Monitoring and reporting would be conducted over a 10-year period as follows: 1) Immediately after plant installation to provide an as-built plan. The as-built review would include the establishment of the photo stations and documentation of the distribution of plant materials. 2) Early spring (i.e., March, April) and late sununer (e.g., September) of the first growing season. 3) Late summer of the second growing season. 4) Late summer of the fifth growing season. 5) Late summer of the seventh growing season. 6) Late summer of the tenth growing season. 4.5.5 Monitoring Reporting The as-built report for the restored habitats would be submitted to the reviewing agency when completed, and all subsequent written reports would be submitted to the reviewing agency no later than October 15"' of the monitoring year for review and approval. The written reports would include: , Condition of plants, including survivorship, percent cover, health, and vigor. Rationale for poor condition of plants, if present, would be determined and recommendations to rectify these conditions would be provided in the report. A February 17, 2000 ASSOCIATED EARIH SCFENCES, ENC. ACK/jblld · KB99U2AS7-LD--D:lld\2-()(J · W2K Page 57 • Quendal/ and Baxter Properties Mitigation Analysis Memorandum discussion of the natural establishment of species not included in the planting plants (desirable and weedy species) would also be provided. Observations of wildlife use . Photo documentation from the permanently established photo stations. • Overall condition of the restored habitats and nearshore habitat, including indications of erosion, human disrurbance, etc. 4.5.6 Contingency Plans Appropriate. contingency plans would be developed as necessary to correct problems identified during the monitoring (i.e., planting failures, shoreline erosion, etc.). If plant survivorship does not meet the established criteria, replanting would be conducted only after the reason for failure has been identified (e.g., poor planting stock,.incorrect moisture regime, herbivory, disease, shade/sun conditions, hydrologic conditions, vandalism,.plant competition, etc.). Any replanting effort required would occur between October 15•• and March 15 .. , or the following spring. All contingency plans would be submitted to the reviewing agencies for their approval prior to implementation. Therefore, timing of implementation would be dependent upon agency staff availability and scheduling. A report would also be submitted to the reviewing agencies following the implementation of any contingency plans. February 17, 2000 ACK/jhlld-KB99U2A57-W-D:\fdlUJO • W2K ASSOCIATED EARTH SCIENCES, INC. Page 58 Quentlall and Baxter Properties Mitigation Analysis Memorandum 5.0 REFERENCES Bennett, J. and Cubbage, J. 1992. Effects of polycyclic aromatic hydrocarbons from Lake Washington on freshwater bioassay organisms and benthic macroinvertebrates. Ecology Report, 28 p. plus appendices. Burgner, R.L. 1991. Life history of sockeye salmon (Oncorhynchus nerka). Pages 3-117 in: Groot, C. and L. Margolis, eds. 1991. Pacific salmon life histories. UBC Press, Vancouver, British Columbia, Canada. Entranco. 1995. Gypsy subbasin analysis, technical memorandum No. 2. Prepared for the City of Renton, Washington. David Evans and Associates, Inc. 1997. Wetland determination report on the JAG Development Property, Renton, Washington. Prepared for CNA Architecmre Group, Bellevue, WA. Fisher, L., Washington Department of Fish and Wildlife. Personal communication to Andy Kindig (Beak), June 6, 1997. Heiser, D. W. and E. L. Finn, Jr. 1970. Observations of juvenile chum and pink salmon in marina and bulkheaded areas. Supplemental progress report, Washington State Department of Fisheries. September 1970. 28 p. King County. 1993. Sammamish River corridor conditions and enhancement oppormnities. King County Surface Water Management, Seattle, WA. 54 p. plus appendices. Larson Anthropological/ Archeological Services, 1997. Culmral Resonance Assessment JAG Development, King County, Washington. Technical Report 97-7, March 27, 1997. Muckleshoot Indian Tribe. 1997. Draft summary of Lake Washington srudies completed by the Muckleshoot Indian Tribe in the vicinity of the Port Quendall project. Provided by Rod Malcom, habitat biologist. Muckleshoot Indian Tribe, Environmental Division, Auburn, WA. Municipality of Metropolitan Seattle (Metro). 1989. Quality of local lakes and streams 1987- 1988 status report. Municipality of Metropolitan Seattle, Water Resources Section, Water Pollution Control Department, Seattle, WA. Norton, 1991. Distribution and Significance of Polycyclic Aromatic Hydrocarbons in Lake Washington Sediments Adjacent to Quendall Tenninals/ J.H. Baxter site. Ecology Report, 73 p. Norton, 1992. Results of Sediment Sampling in the J.H. Baxter Cove, Lake Washington -June 1991. Ecology Technical Document, 18 p. February I 7, 2000 ASSOCIATED EARTH SCIENCES, INC. ACK/jh/ld • KB99l42A51 -1.lJ-D:IJtfU.(){). W2K Page 59 Quendall and Baxter Praperties Mitigation Analysis Memorandum Pfeifer, B. and J. Weinheimer. 1992. Fisheries investigations of Lakes Washington and Sammamish, 1980-1990. VI Warmwater fish in Lakes Washington and Sammamish (draft report). Washington Department of Fish and Wildlife, Olympia, WA. Ratte, L. D. and E. 0. Salo. 1985. Under-pier ecology of juvenile pacific salmon (Oncorhynchus spp.) in Commencement Bay, Washington. Final report prepared by the University of Washington, Fisheries Research Institute for the Port of Tacoma. FRI-UW-8508. December 1985. Shepard, M.F. and J.C. Hoeman. 1979. Some comparisons ofbenthis biota in control areas and areas affected by sewage effluent in Lake Washington, 1977 -1978. U.W. College of Fisheries, Wa. Coop. Fish. Res. Unit, Seattle, WA. citation from EVS Consultants, 1990. Aquatic Resources of Lake Washington. Report prepared for Woodward-Clyde Consultants, Seattle, WA. November 19, 1990. Thermoretec (RETEC). 1997. Sediment quality memorandum. Consultant report prepared for Port Quendall Company. April 29, 1997. Remediation Technologies, Inc., Seattle, Washington. University of Washington. 1996. U.W. Lake Washington Sockeye Workshop. Notes from presentations by Roger Tabor (USFWS), Roland Viera (U. W.) and Tom Sibley (U. W.) at U.W. conference held November 19, 1996. Washington Department of Ecology. 1995. 1994 Washington state water quality assessment, [305(b)] report companion document. Olympia, WA. Washington Department of Ecology. 1996. 303(d) Department of Ecology draft decision matrix for surface waters listed under section 303(d) included in 305b Report of the Federal Clean Water Act (CW A). Washington Department of Ecology, Olympia, WA. Washington Department of Fish and Wildlife and Western Washington Treaty Indian Tribes. 1994. 1992 Washington State salmon and steelhead stock inventory, Appendix I, Puget Sound stocks, South Puget Sound volume. WDFW, Olympia, Washington. Wydoski, R.S. and R.R. Whitney. 1979. Inland fishes of Washington. University of Washington Press, Seattle, WA. 220 p. February /7, 2000 ASSOCIATED EA.Rm SCIENCES, INC. ACX/jhlld -K899/42.A57 -LIJ.D:Ud\2-()(J. W2K Page 60 J.H. BAXTER PROPERTY MITIGATION ANALYSIS MEMORANDUM An Addendum to the Quendall and Baxter Properties Mitigation Analysis Memorandum, dated February 17, 2000 Prepared for: Vulcan Northwest 110 llO"' Avenue NE, Fifth Floor Bellevue, Washington 98004 Prepared by: Associated Earth Sciences, Inc. 911 5"' Avenue, Suite 100 Kirkland, Washington 98033 425-827-7701 Fax: 425-827-5424 October 2. 2000 Project No. KB99142B 1. H. Ba;:ter Property Mitigation Analysis Memorandum An Addendum to the Quendal/ and Ba;:ter Properties Mitigation Analysis Memorandum Dated February 17, 2000 TABLE OF CONTENTS 1.0 INTRODUCTION ....................................................................................... 1 2.0 REMEDIATION IMPACTS TO THE BAXTER NORIB PARCEL .............. : ........... 2 3.0 REMEDIATION IMPACTS TO THE BAXTER SOUTH PARCEL ................. , ........ 2 3.1 Disturbance to Shoreline .......................................................................... 2 3.2 Dredge Offshore Polycyclic Aromatic Hydrocarbons (PAH) .............................. 2 3.3 In-Water 50 Percent or Less Wood Waste .................................................... 2 3.4 Upland Soil Remediation and Capping ......................................................... 3 4.0 SOUTH BAXTER MITIGATION .................................................................... 3 4.1 Wetlands D and E .................................................................................. 3 4. 2 Offshore Grey Zone Alternative Actions ...................................................... 4 4.3 Timing of In-Water Work ........................................................................ 4 4.4 Water Quality ................................................................................. ~ ..... 5 4.5 Mitigation Implementation Schedule ........................................................... 5 4.6 Monitoring and Contingency ..................................................................... 5 4. 7 Mitigation Assurance .............................................................................. 5 LIST OF FIGURES Figure I. Remediation Activities and Wetlands and Shoreline Vegetation on the South J .H. Baxter Property ....................................................... 6 Figure 2. South J.H. Baxter Property Remediation Mitigation ..................................... 7 Oct~r 2. 2000 ASSOCIATED EARm SCIENCES. INC. ACK/Id· KB99U2BS • UJ.D:Ud'i/0.00 • W'/.K Page i J.H. Baxter Property Mitigation Analysis Memorandum An Addendum to the Quendall and Barter Properties Mitigation Analysis Memorandum Dated Febmary I 7, 2000 1.0 INTRODUCTION The purpose of this addendum is to define mitigation incumbent on the prospective purchaser of the J.H. Baxter property as an element of the Washington State Department of Ecology (Ecology) approval of a Consent Decree and Cleanup Action Plan for the North and South Parcels of the J.H. Baxter property. The mitigation obligation would result from the impacts of remediation of the South Parcel of the J.H. Baxter property ("Baxter South Parcel") under a Consent Decree with Ecology. The Mitigation Analysis Memorandum for the combined Quendall Terminals and J .H. Baxter properties collectively described mitigation agreed for remediation of both 1he Quendall Terminals and Baxter South Parcel properties, without specifically separating !he two'. This addendum was prepared consistent with the aforementioned memorandum to clarify mitigation for the South Baxter Parcel alone, in the event remediation of that parcel proceeds independently or on a different timescale from remediation on the Quendall Terminals Parcel. Quendall Terminals will move forward under different ownership and their obligations will be addressed pursuant to the Quendall Terminals Consent Decree and Cleanup Action Plan, which will be negotiated with Ecology by the City of Renton. All mitigation in the Associated Earth Sciences, Inc. Mitigation Analysis Memorandum (AESI, 2000) not specifically defined as an obligation for the Baxter South Parcel in this addendum is an obligation for remediation on the Quendall Terminals property. A reference site on Lake Washington will be used to develop the final mitigation plan that will detail the plant communities, structural habitat elements (e.g. woody debris), site grades/hydrology, and construction maintenance specifications. The reference site will be used only to refine the design concepts identified in the February 17, 2000 Mitigation Analysis Memorandum. All referenced site information will be included in the final mitigation plan, as well as hydrology "performance" standards !hat will be based on conditions documented at the reference site. The final mitigation plan will be submitted for review and approval to Ecology and the U.S. Army Corps of Engineers (COE). No elements of the Mitigation Analysis Memorandum will be changed by the final plan. The final plan will simply provide the design, construction, and maintenance details of the concepts agreed to in the February 17, 2000 Mitigation Analysis Memorandum. This addendum is not a stand-alone document, and requires the reader to refer to the Mitigation Analysis Memorandum. Ouendall and Baxter P .. rnoerties (AES!, 2000). ' As.!OCiated Earm Sciences, Inc. (AES!), 2000, Mitiga1ion Agalysis Memorandum, Ouendall and Baxter Propenies: Prepared for Vulcan Northwest and 1he City of Renton, dated February 17, 2000. Ocrober 2. ZOOO ASSOCIATED EARTH SCIENCES, INC .. ACX/Id· KB9914285 • LD•D:lld\J0-00 • W2K Page I J.H. Baxter Property Miligacion Anntysis Memorandum An Addendum ro the Quendal/ and Baxrer Properries Mitigacion Analysis Memorandum Dated February 17. 2000 2.0 REMEDIATION IMPACTS TO THE BAXTER NORTH PARCEL There are no remediation impacts to shoreline or wetland resources which would occur on the North Parcel of Baxter. Consequenlly, no mitigation is proposed on the Baxter North Parcel. 3.0 REMEDIATION IMPACTS TO THE BAXTER SOUTH PARCEL Remediation activity planned for the Baxter South Parcel is shown in Figure l. This figure was adapted from Figure 3-1 in the Mitigation Analysis Memorandum. 3.1 Disturbance to Shoreline Land-based shoreline remediation on the Baxter South Parcel will consist of capping, which is not expected to directly impact the existing Baxter South Parcel shoreline or its vegetation (refer to Section 3.1.1, AES! 2000). 3.2 Dredge Offshore Polycyclic Aromatic Hydrocarbons (PAH) Wetland E (Baxter Cove) will be dredged to remove polycyclic aromatic hydrocarbon (PAH) impacted sediments, which will remove all vegetation and woody debris in the wetland and most of the adjacent vegetated area. Please refer to Table 3-2 in the Mitigation Analysis Memorandum for a summary of wetland impacts to the 0.23-acre Wetland E. Turtles will be displaced from this shoreline area during the dredging activities. · Red-wing blackbird nesting habitai will be eliminated. 3.3 In-Water SO Percent or Less Wood Waste An offshore "grey zone» area with less than 50 percent wood waste is present in Lake Washington off the southern shore of the Baxter South Parcel (Figure 1). Bioassay testing of sediments in this grey zone is underway, and the results of those tests will be used to determine which of the following remediation responses would occur in the grey zone: (I) If determined to be clean, no action would be required. (2) Complete dredging of the area to remove the less than 50 percent wood waste could be required. The grey zone area is approximately 10,000 square yards in area. October 2, 200() ASSOCIATED EART11 SCIENCES, INC. ACT/Id· KBIJ9l4lB5 · W-D:lldl/0-00-W2'K Page 2 J. H. Ba.r.ter Properry MitigaJion Analysis Memorandum A" Addendum 10 1/ze Quendall and Bax/er Properlies Mitigation Analysis Memorandum Dated February /7, 2000 3.4 Upland Soil Remediation and Capping Wetland D (0.08 acre), and all upland vegetated areas on the Baxter South Parcel, would be eliminated by upland soil excavation and capping, with the exception of a narrow band of existing shoreline vegetation to the south and north of Wetland E (a.k.a. Baxter Cove) along the Baxter South Parcel shore (Figure I). Please refer to Table 3-2 in the Mitigation Analysis Memorandum for a summary of impacts to Wetland D and to Section 3 .1.5 in the Mitigation Analysis Memorandum for a more detailed description of vegetation habitat affected by·upland remediation and capping. 4.0 SOUTH BAXTER MITIGATION 4.1 Wetlands D and E Wetlands D and E would be eliminated as a result of remediation of the Baxter South Parcel. Under a Consent Decree in conformance with the Model Toxics Control Act (MTCA) (RCW 70.105D), remediation actions are exempt from procedural requirements of Jaws requiring or authorizing local government permits or approvals for the remediation action, which would include City of Renton wetland mitigation requirements (please refer to Section 1.1 in the Mitigation Analysis Memorandum for greater detail). However, compliance with the substantive requirements of these Jaws and regulations are ensured by Ecology through issuance of the Consent Decree for the Baxter South Parcel. Both wetlands are Class 3 wetlands per the City of Renton's categorization, that would require replacement at a 1: 1.5 (impact: restoration) ratio by the City of Renton. Ecology has agreed to the I: 1.5 restoration ratio as one element of the mitigation package for the Baxter South Parcel. Wetlands D (0.08 acre) and E (0. 23 acre) would be replaced with one higher value Class 2 forested wetland (0.46 acre) in the present location of Baxter Cove (Wetland E). A 50-foot (possibly buffer- averaged) vegetated and enhanced buffer referenced in the February 17, 2000 memorandum would be placed around the restored wetland (Figure 2). The 50-foot averaged wetland buffers will meet the following criteria: • Remediation monitoring facilities (i.e., monitoring wells) and necessary access will be allowed within the wetland buffers. The buffer area displaced by such facilities will be added in another portion of the same wetland buffer. • Outside of remediation monitoring facilities and the Puget Sound Energy exception parcel, the averaged wetland buffer areas cannot be reduced to widths less than 40 feet. October 2, 2000 ASSOC/A TED EA Rm SCIENCES, INC. ACK/Id· KB99U2B5 · LD-D:Vdl/0-00 . W2K Page 3 J.H. Baxter Property Mitigation Analysi.s Memorandum An Addendum to the Quenda/1 and Baxter Properties Mitigation Analysis Memorandum Dated Fel,ruary 17, 2000 • The final configuration of the averaged wetland buffers is subject to approval by Ecology. Wetland hydrology will be controlled by lake level. Stormwater from any future developed project may be released to the wetlands. Any stormwater released to the wetlands would be treated prior to its release, if such treatment were required. Vegetation and logs would provide shoreline protection as found under current conditions. Water quality functions would be limited due to the limited area draining to the restored and enlarged Baxter Cove wetland, similar to existing conditions in Wetlands D and E. The biological support provided by the wetland mitigation area al Baxter Cove is expected to be greater than is currently provided by Wetlands D and E. If and when remediation and mitigation along the Quendall Terminals properties occurs, the remediated wetland on the Baxter South Parcel would be connected to another wetland at the south end of the Quendall Terminals shoreline by a restored 100-foot vegetated shoreline along Quendall Terminals. Specific wetland habitat restoration activities to replace the excavation of Baxter Cove (Wetland E) and the loss of Wetland D are detailed in Section 4.1.2 of the Mitigation Analysis Memorandum. Those details include live-trapping and replacement of turtles in Wetland E, among other elements of wetland creation and enhancement. Plant species proposed for planting within the wetland buffers are listed in Table 4-1 (AESI, 2000). [The note referencing the inclusion of horticultural or non-native species in a transition zone within the buffer should have been deleted. No horticultural or non-native species will be planted in the shoreline buffer, wetlands, or wetland buffers. 4.2 Offshore Grey Zone.Alternative Actions No mitigation action is required. The remediation, no matter which alternative is determined necessary, will improve the existing condition. If in-water dredging is required in the grey zone, then the timing of work in Lake Washington below the ordinary high water mark (OHWM) will avoid the annual migration of juvenile salmonids (see Sections 3.2.2 and 4.2.1 in AESI 2000). 4.3 Timing of In-Water Work The Washington Department of Fish and Wildlife (WDFW) recommends no in-water work in southern Lake Washington during the period from February 1 through June 15 to protect juvenile salmonid runs from physical disturbance and short-term turbidity. Therefore, any grey zone work and all work in Baxter Cove would be conducted between June 16 and January 31. Additional details required to protect species listed under the federal Endangered Species Act (ESA) will be provided as necessary during the biological review process for those species. October 2, 20()() ASSOCIATED EAR111 SCIENCES, INC. ACKRd · KIJ99/41/lj . W.D:Vdl/0-00. WlK Page4 J. Ii. Baxter Property Miliga1ion Analysis Memorandum 4.4 Water Quality An Addendum to the Quendall and Barter Properties Mitigation Analysis Memorandum Daled February 17, 2()(X) No long-term impacts will accrue from the proposed remediation and mitigation, except for the obvious improvement gained through the removal or sequestering of listed contaminants under the Consent Decree. However, short-term impacts from implementation of the re.mediation activities could occur without proper temporary erosion and sediment control (TESC) measures. A synopsis of likely TESC .measures would be proposed as part of _the Engineering Design Report for the Baxter South Parcel. These measures would consist of all applicable portions of Table 4 (in AESI 2000). 4,5 Mitigation Implementation Schedule Scheduling for the Baxter South Parcel mitigation is described in Section 4.4.1 (in AES! 2000). 4.6 Monitoring and Contingency Post-construction performance standards, a JO-year monitoring schedule, maintenance requirements, reporting, and contingencies for the proposed buffer and wetland enhancement on the Baxter South Parcel are described in Section 4.5 (in AES! 2000). 4. 7 Mitigation Assurance The Consent Decree for the Baxter South Parcel would provide assurance that the mitigation proposed iii this document and in the Mitigation Analysis Memorandum will be performed. The Consent Decree will also require that the mitigation installation, oversight, and monitoring contractor be identified in advance to Ecology. Oc1ober 2, 2000 ASSOCl,ffED EARTH SCIENCES, INC. ACKltd · KB99H2B5 · W-D:lldll().(){). W2K Page 5 I l • r,'-& ,;.~ ~'t-<j / I i ~ a l ... w' ii l' -:I l' ~SIA880CIATIIO ,r~ ~CB8,INC /', -~ '" J3t'f~ .,o,7 ',, '~,, ;l;"'ol;' #·'7 &, , QUENDALL TERMINALS .' REMEDIATION ACTIVITY ANO W!TLANDS ANO SHORELINE VEGETATION SOUTH J.H. 8AXTER PARCIEL R£¥EDSA TtOH FOOTP'RU~T Rl!NfON. WASHINGTON -,_J -::;j:Tiii : ..,: ,Ho:;j !//,·:>'j LEGEND NH o1 remediallon impact along tl"lil sho(el1na Leu, trian SO'r. wood waste lno aciion. gppmg. i,artiat eapc,in9. oa1t1a1 <1reo9e. 01 CO('l'lpl•te <l•&ege. to be determined) Otedge to 6' aM ral)lacad willl eiean malenal to original 9r .ade Dredge to 3· arid reolaC-$<1 wun e1,u11 ma1er1a1 lo Qnginal grao, 3' cap with c1ec1n maten.il or C,;Jip wiin redevelopmer.t Excavated lo reqo1rlld oepu, lo remove oOntaminanll or sludge: in situ stablli.i;ed to 18' below ground surface or ,~aeeo wiin dean material lo capped grade (Se-a NOie :n 81.aQ.Oerry Shn,o, Trees. "IOTe.. 1 All I-IA81'IA.T. WETLAND. AND PROJECT FEATURC: LOCATIONS ANO QUANTITIES ARE APPROXIMA re ( SEE FINAL CLEANUP ACTION Pl AN FOR A CCU RA.Tl; C~EANUP 01:TAllS. A NOATH IOJ a, :u, ,GI .._.~'10~"""1! KAl.t ..-,u1 FIGURE I OATE f15t00 PJ!OJ HO K0991•28 Lake Washington Wetland Reference Site Memorandum (AESI, July 31, 2001) Associated Earth Sciences, Inc. REMEDIATION WETLAND MITIGATION· LAKE WASHINGTON WETLAND REFERENCES SITES J.H. BAXTER SOUTH PARCEL Renton, Washington Prepared for: The Port Quendall Company Project No. KB99142A July 31, 2001 911 FIFll{AVENUE • SUITE 100 • KIRKLAND, WA98033 • P:4251827-noi • F:4251827-5424 N A 0 ... ... '"' A 24SIASSOC1ATEO J' EARTH i SCIENC>:S. INC ~ I I I I I ( '/1 ·J ;w' I~:::. -LO ': ..,.,.... -:::. REVISED\ LOT #15 I {(~ I ~ lti\l I GypSy .ft I f/11. Gf I// I I I I I// \ I,, \ I I \ , , , \ /11 \ 111 . t 11 \ I WPROPO~ED NEW PARCEi LINE ; BAXTER SOUTH PARCEL/ ~"*'o~ 0 o 50'AVERAGEBUFFER \ ..-~ooo I 00 0 000:\ I 000 oo I 00 oo I 0 0.46 AC. • APPROXIMATE AREA OF \ MITIGATION WETLAND \ =------------- l I BAXTER SOUTH PARCEL MITIGATION SOUTH BAXTER PARCEL RENTON, WASHINGTON I nGURE 2 J.H. BaxterSc,uth Parcel Renton, Washington INTRODUCTION Remediation Wetland Mitigation lake Washington Welland References Sites The proposed remediation action on the J. H. Baxter South Parcel site involves capping, excavation, and in silu immobilization of contaminated areas (polycyclic aromatic hydrocarbons [PAH], pentachlorophenol [PCP], and non-aqueous phase liquid [NAPL]). Contaminants in Baxter Lagoon (Wetland D) and Baxter Cove (Wetland E) will be removed or stabilized in place. Wetland habitat will be restored in Baxter Cove to mitigate the wetland impacts resulting from the approved remediation action. The restored Baxter Cove will replicate current inundated and saturated soil conditions over a broader area than currently exists. Cattail (Typha latifolia ), reed canarygrass (Pha/aris arundinacea), and rush (Juncus spp.) currently dominate the vegetated wetland areas of Baxter Cove. Open water conditions also exist. As agreed with the Washington State Department of Ecology (Ecology), reference sites on Lake Washington were reviewed to develop the plant communities proposed within the final wetland mitigation plan. Since relatively undisturbed, pristine wetland habitats do not occur along the Lake Washington shoreline, information on wetland and wetland buffer plant community composition and structure was collected at Mercer Slough, Luther Burbank Park, Juanita Bay, and St. Edwards Park. This information, upon which the wetland mitigation plan for the J .H. Baxter South Property site was prepared, is summarized below. REFERENCE SITES . Mercer Slough Information collected at the Mercer Slough site consists primarily of data on the wetland plant community as much of the buffer supports residential, commercial, and municipal uses. Areas within the Mercer Slough wetland that are permanently inundated and seasonally inundated predominantly support Douglas spiraea (Spiraea douglasil), cattail, Pacific willow (Salix lasiandra), Sitka willow (Salix scouleriana), red osier dogwood (Cornus stoloniferia), hardstem bulrush (Scirpus acutus), and small-fruited bulrush (Scirpus microcarpus). Slough sedge (Carex obnupta) was noted in several areas of seasonally inundated / permanently saturated areas; however, this species is not dominant. Common species noted in the seasonally saturated areas include black cottonwood (Populus trichocarpa), red alder (Alnus rubra), Sitka willow, salmonberry (Rubus spectabilis), lady fem (Athyrium filix:femina), soft rush (Juncus ejfusus), horsetail (Equisetum spp.), and creeping buttercup (Ranuncu/us repens). Gooseberry (Ribes spp.) was also observed in this habitat, but this species is uncommon. In drier areas (e.g., raised hummocks), mountain ash (Serbus sitchensis), paper birch (Betula papyrifera), red elderberry (Sambucus racemosa), Himalayan blackberry (Rubus discolor), stinging nettle (Urtica dioica), and bedstraw (Gal/um spp.) are common. Hazelnut (Cory/us cornuta) was also observed in upland areas adjacent to the boardwalk trail system that is located throughout the wetland. July J/, 1()()/ JW~p-ICMPf.llAltJ.D:\W!1ql-..(J/-WlK ASSOCIATED EAKI'H SCIENCES. INC. Page I .• J.H. Baxter South Parcel Ren1on, Washington Lulher Burbank Park Remediation Wetland Mitigation Lake Washington Wetland References Siles The non-maintained portions of the Lake Washington shoreline within Luther Burbank Park primarily support willows and cattails. However, Oregon ash (Fraxinus latifolia} is also common within park-area wetland habitats. The buffer of the Luther Burbank Park wetlands consists primarily of invasive species (e.g., Scotch broom [Cytisus scoparius], reed canarygrass, etc.) and maintained park areas. Juanita Bay Wetland habitats within the greater Juanita Bay wetland complex include palustrine forested, palustrine scrub-shrub, palustrine emergent, palustrine unconsolidated bottom, and lacustrine littoral aquatic bed wetland habitats. However, within the vicinity of the Lake Washington shoreline, palustiine scrub-shrub and palustrine emergent wetland habitats are dominant. Dominant woody vegetation within the vicinity of the Lake Washington shoreline consists . primarily of Pacific willow and Sitka willow. However, black cottonwood, red alder, Oregon ash, red osier dogwood, twinberry (Lonicera involucrata), Douglas spiraea, and Himalayan blackberry are also locally abundant. Dominant herbaceous plant species within the vicinity of the Lake Washington shoreline include reed canarygrass, creeping buttercup, skunk cabbage, and lady fem. Other herbaceous species occurring within the general vicinity include small-fruited bulrush, soft rush, horsetail, curly dock (Rumex crispus), Cooley's nettle (Stachys cooleyae), common velvetgrass (Holcus lanatus), brooklime (Veronica sp.), water parsley (Oenanthe sarmentosa), and stinging nettle (Urtica dioicaJ. Common plant species in the relatively undisturbed buffer of this wetland located approximately 500 feet upgradient of the Lake Washington shoreline include bigleaf maple (Acer macrophyl!um), red alder, black cottonwood, western redcedar (Thuja plicata), salmonberry, red elderberry, hazelµut, and stinging nettle. Conifers such as Douglas-fir (Pseudotsuga menziesil) and western hemlock (Tsuga heterophylla) occur, but are currently relatively uncommon. However, these tree species were likely common prior to development of the local area. St. Edward State Park Upiand forest habitats along the shoreline of Lake Washington in the vicinity of St. Edward State Park are relatively undisturbed. Dependent upon the local moisture regime, plant species common to these habitats include Douglas-fir, western hemlock, western redcedar, bigleaf maple, red alder, vine maple, salmonberry, thimbleberry, hazelnut, Oregon grape, salal, and sword fem. July JI. 2001 JBV¥-X8'91.J1AIIJ •l>:IWP"IPpr~I -"2X ASSOCIATED EARTH SCIENCES. INC Page2 J.H. Ba.ter South Parcel Renton. Washington SUMMARY Remediation Wetland Mitigation Lake Washington Wetland References Sites As noted above, relatively undisturbed, pristine wetland habitats do not occur along the Lake Washington shoreline. However, in those instances where native vegetation was observed within the vicinity of the reference sites, these species were incorporated into the wetland mitigation planning for the J.H. Baxter South Property s,te as practical. July 31, 2001 .n.v..,-K»IIIUW • &.lwr,,pr -01 -ll?K ASSOCIATED EAKTH SCIENCF,S, INC. Page3 . ··•-··: . ... -. ....... -. ' . • .. ::· . .·.· Attachment 3 Inspection, Maintenance, and Monitoring Plan South Baxter Property Renton, Washington Attachment 3 Inspection, Maintenance, and Monitoring Plan J.H. Baxter South Property Prepared by: The RETEC Group, Inc. 1011 SW Klickitat Way, Suite #207 Seattle, Washington 98134 RETEC Project Number: JAGC0-02438-895 Prepared for: Port Quendall Company 505 Fifth Avenue South Seattle, Washington 98104 May 13, 2002 Inspection, Maintenance, and Monitoring Plan J.H. Baxter South Property Prepared by: The RETEC Group, Inc. 1011 SW Klickitat Way, Suite #207 Seattle, Washington 98134 RETEC Project Number: JAGC0-02438-895 Prepared for: Port Quendall Company 505 Fifth Avenue South Seattle, Washington 98104 Prepared by: f /k lu?k"'--- K'ristin T. Hendrickson, Environmental Engineer Grant Hainsworth, P.E., Project Manager May 13, 2002 P;IDOCS\24381895\FinallSBoxl&MPlan.doc Table of Contents Introduction .................................................................................................... 1-1 I . I Background ........................................................................................ 1-1 1.2 Purpose ............................................................................................... 1-1 2 Environmental Cap Inspections and Maintenance ......................................... 2-1 2. I Cap Inspection and Maintenance Requirements ................................ 2-1 2.1.J lnspections ............................................................................. 2-l 2.1.2 Maintenance ........................................................................... 2-l 2.2 Documentation and Reporting ........................................................... 2-2 3 Soil Management Plan ................................................................................... 3-1 3.1 Ecology Notification .......................................................................... 3-2 3.2 Health and Safety ............................................................................... 3-1 3.3 Soil Stockpiling .................................................................................. 3-1 3.4 Analytical Testing .............................................................................. 3-2 3.5 Backfill ............................................................................................... 3-2 4 Groundwater Monitoring Plan ....................................................................... 4-1 4.1 Monitoring Plan ................................................................................. 4-1 4.2 Schedule ............................................................................................. 4-2 4.3 Data Evaluation and Reporting .......................................................... 4-2 5 Long Term Wetland Monitoring .................................................................... 5-1 5.1 Monitoring ...... ; .................................................................................. 5-1 5.2 Monitoring Schedule .......................................................................... 5-2 5.3 Monitoring Reporting ........................................................................ 5-2 5.4 Contingency Plans ............................................................................. 5-3 Appendix A Sampling and Analysis Plan Appendix B Groundwater Sample Filtering Rationale JAGC0..()2438-895 List of Tables Table 4. J Potential Cleanup Levels for Groundwater ............................................... 4-3 JAGC0-02438-895 ii List of Figures Figure 1-l Baxter Property Location ......................................................................... 1-2 Figure2-I Extent of Environmental Cap ................................................................... 2-3 Figure 3-1 Typical Environmental Cap Cross Sections ............................................. 3-3 Figure 4-1 Compliance Monitoring Network ............................................................ 4-4 Figure 4-2 Groundwater Monitoring Flow Chart ..................................................... 4-5 JAGC0-02438-895 iii 1 Introduction 1.1 Background The Baxter South Property is located on the eastern shore of Lake Washington on the former delta of May Creek (Figure 1-1 ). The property was essentially undeveloped until the mid-1950s, when a wood treating facility was constructed on site. All property histories indicate that both creosote and pentachlorophenol (PCP) treating solutions were used at the site until wood- treating operations ceased in 1981. Creosote was used to treat railroad ties , and pilings, and PCP solutions were used to treat utility poles. Wood was treated and stored on the Baxter South Property and was distributed to purchasers by rail or truck. Based upon historical usage of chemicals at the site as well as analytical data available from investigation activities described in the FS, the compounds of concern at the Baxter South Property are PCP and polycyclic aromatic hydrocarbons (P AHs). These compounds are known to exist in both soil and groundwater at the site as well as in sediment in Baxter Cove. 1.2 Purpose The purpose of this Inspection, Maintenance, and Monitoring Plan is to detail the activities required upon completion of remedial activities. Maintenance, monitoring, and contingency plans are outlined in this report. JAGC0-02438-895 1-1 "o~iriiu &;,ct, . 0T:urill 0 100 . ·. o:.'."~"' . <.· . I ·<i,New_~ort HI 11 c ...... 200 400 SCALE IN FEET / / NORTH PROPERTY J.H. BAXTER JAGC0-02438-895 I I I / I I I / I I i / I I ,./' ,,- / I / !// I I I I / I I I I I I I 1 / I I I I 1 1 I I I I/ I f J I ; I I I I ; I i I / I I I I I I I I I I J.H.BAXTER PROPERTY LOCATION I I I I DATE: 5/10/01 D~: A.5./SEA FILE: 2438$361 LAYOUT: Loyout 1 FIGURE 1-1 2 Environmental Cap Inspections and Maintenance This section details the inspection and maintenance (I&M) requirements for the environmental cap at the Baxter South Property. This plan will guide future maintenance (if necessary) of the cover. Figure 2-1 provides a plan view of the soil cover area. 2.1 Cap Inspection and Maintenance · Requirements 2.1.1 Tenant Notification Facility tenants will be informed about the existence of the environmental cap. Specific items for notification and information exchange include: • Informing all on-site and temporary workers of site environmental conditions, including environmental conditions below the cap; • Restricting penetrations of the cap; and • Informing all on-site and temporary workers of the need and mechanism for reporting damage to the cap or construction that may affect the cap. 2.1.2 Inspections 2.1.3 Visual inspections of the environmental cap will be conducted quarterly during the first year following cap installation. After the first year, PQC will verify for Ecology that no significant issues were apparent and inspections will be performed annually thereafter. Additional inspections will be performed when any damage to the cap is reported. Any indication of soil disturbance or settlement such that ponding occurs will be further investigated. Any indication of soil erosion such that the identifier layer is being exposed will also be investigated. The inspection will also include examining the development features for cracks or other damage. Maintenance Based upon inspection results, areas of damage will be evaluated to determine proper repair. Areas where erosion has occurred or where the identifier layer is exposed may require replacement of the soil cover. Replacement may include placing additional soil so that the thickness is as least 3 feet above the identifier layer, and ensuring that adequate erosion control measures are in place in the affected area. For areas capped by development features, crack repair will occur only in those areas where development users are potentially JAGC0..()2438-895 2-1 Inspection, Maintenance, and Monitoring Plan, J.H. Baxter South Properly exposed to hazardous vapors (i.e. methane). Other repair or replacement of cap areas will occur where the cap is sufficiently breached to allow potential dermal contact. 2.2 Documentation and Reporting Environmental cap conditions and relevant observations will be noted during each inspection. At a minimum, each inspection event will require that a log be completed. All field logs associated with each inspection event will be compiled into an inspection report. , Documentation regarding all cap inspection and maintenance activities will be maintained. Relevant summary information related to soil cover inspection and repair will be included in reports to Ecology. Ecology will be notified of any non-trivial inspection report (i.e., a report that indicates damage or unusual conditions). Structure or cap maintenance is permitted without notice to Ecology so long as appropriate health and safety protocols are followed. A Soil Management Plan (Section 3) outlines specific protocols associated with future soil excavations, including health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options. JAGC0-02438-895 2-2 LEGEND ENVIRONMENTAL CAP I I i I i J.H. BAXTER JAGC:0.02438-850 I I 0 60 I I I 120 ·' I I I I I I SCALE IN FEET I ·' I .I i I i I i I EXTENT OF SOUTH BAXTER ENVIRONMENTAL CAP I I I I I I ·' I 240 OAl'E: ~/10/01 ORWN: A.S./SEA fllE; 2'4J8Sl62 1.Al'OlJf: Layoutl FIGURE 2·1 3 Soil Management Plan Section l of the restrictive covenant states: "Without prior written consent of Ecology, except as provided below, the Owner shall not alter, modify, or remove any structures or caps as required by the Cleanup Action Plan in a manner that may result in the release or exposure to the environment of contaminated soil or create a new exposure pathway without prior consent from Ecology. Structure or cap maintenance is permitted without notice to Ecology as long as appropriate health and safety protocol are followed." . The restrictive covenant further states: "A Soil Management Plan will be prepared for Ecology approval that outlines specific protocols associated with future soil excavations, including health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options. In accord with the Soil Management Plan, limited excavation, utility placement or repair, minor site grading, or other pre-approved activities connected with site development are permitted so long as appropriate health and safety protocols are followed and a structure or cap that provides protection from direct contact as required by the Cleanup Action Plan is provided following development.'' An environmental cap shall be installed during remedial activities that will separate site users from the chemicals of concern present in surficial soil. The cap includes an identifier layer at the interface between the native soil and the imported cover soil. This identifier layer will serve as a visual indicator to alert future site maintenance workers of their proximity to native soil, and it will physically separate the existing native soil from the new soil cover. This Soil Management Plan outlines the protocols associated with any future soil excavations that breach the identifier layer. 3.1 Health and Safety Workers handling native material shall have HAZWOPER training and be required to wear appropriate personal protective equipment (PPB). Air monitoring shall be conducted to determine possible hazardous conditions and to determine the appropriate level of PPE. Appropriate decontamination procedures of personnel and equipment shall be employed before leaving the site. The Occupational Safety and Health Administration (OSHA) specifies additional health and safety requirements for hazardous waste sites (29 CFR 1910.120). 3.2 Soil Stockpiling If stockpiling of the soil is necessary, it shall be held in a lined cell with appropriate erosion and sedimentation controls. These erosion and sedimentation controls include, but are not limited to, berms to prevent run-on and run-off and placement of an impermeable cover over the stockpile. The stockpile cover shall be held in place with sand bags or similar material. JAGC0-02438-895 3-1 Inspection, Maintenance, and Monitoring Plan, J.H. Baxter South Propaty 3.3 Analytical Testing The stockpile of native material shall be visually inspected for contamination. If staining or sheening is present, the soil shall be deemed contaminated and it shall be transported off-site for disposal. If there is no visual evidence of contamination, samples shall be taken for PAH and BTEX analysis. If concentrations exceed cleanup levels the soil shall be transported off-site for disposal. 3.4 Backfill _Clean, imported fill material shall be used to backfill the excavation if contaminant concentrations in the native material are found to be in exceedance of cleanup levels. Once backfill is complete, the identifier layer and the environmental cap shall be reinstalled. This cap will be at least 3 feet thick and will consist of imported clean or treated soil or other appropriate development features (Figure 3-1 ). 3.5 Notification In accordance with the restrictive covenant, Ecology will be notified of any activity not covered by this Plan. Ecology shall be notified 30 days prior to planned activities and within 30 days after unplanned emergency access JAGC0-02438-895 3-2 CRUSHED ROCK INDICATOR LAYER (GEOTEXTILE OR SIMILAR) NATIVE MATERIAL .RETEC • 0 _[0.5' • ~ .... ~ 0 0 0 I~ 0 1 • DATt:: 5/10/01 1 CLEAN SOIL -r I 3' .4"""'"'"'"""""""™"""' l INDICATOR LAYER (GEOTEXTILE OR SIMILAR) NATIVE MATERIAL~ JAGC0-02438-8'15 "''''" A.S.LSEA m, 2"3Bg05< LAYOUT: Layout I TYPICAL ENVIRONMENTAL CAP SECTIONS fl9URE3·1 4 Groundwater Monitoring Plan The selected remedial action for groundwater includes monitoring at a conditional point of compliance and institution of deed restrictions to prohibit use of site groundwater as a source of drinking water. Groundwater quality will also be addressed by substantial source removal and stabilization, described in the EDR. The groundwater remedial action will also include a compliance monitoring plan, described below. Based on shoreline groundwater samples collected in October 1998 and January 2000, groundwater discharges to the lake currently meet cleanup levels. Additional · source area remediation (excavation and stabilization) will further improve groundwater quality, so the future need for contingent remedies is not anticipated. 4.1 Monitoring Plan Monitoring is one of the threshold requirements for cleanup actions under MTCA (W AC-173-340-360(2)). Compliance monitoring, as defined in WAC 173-340-410(l)(c), is described in this section. This monitoring is intended to confirm the long-term effectiveness of remedial actions. The point of compliance is the shoreline. Compliance monitoring will consist of monitoring shoreline wells to ensure protection of surface water. Existing wells BAX-SA, BAX-8B, BAX-6S, BAX-6D and BAX-15 will comprise the compliance monitoring network. The compliance monitoring network is shown in Figure 4-1. Samples will be collected following the protocols outlined in the Sampling and Analysis Plan (Appendix A). Groundwater will be collected utilizing a low-flow sampling method. Samples will be field filtered. A rationale for field filtering has been prepared in accordance with WAC 173-340-720 and is included in Appendix B. The wells allow for monitoring of groundwater quality within the silty peat zone and the lower sand zone. These well pairs are located at lateral spacings of approximately I 00 feet along the shoreline, and groundwater will be analyzed for PAH and PCP by EPA Method 8270 SIM. The data will be used to establish trends in groundwater quality over time and determine whether groundwater discharges to the lake meet cleanup levels. Cleanup levels for groundwater were selected as the minimum of the applicable cleanup standards. In the event that this value was below. the practical quantitation limits (PQLs), the PQL was selected as the cleanup level as specified in WAC 173-340-700(6). Table 4-1 provides a list of the cleanup levels for groundwater. JAGC0-02438-895 4-1 Inspection, Maintenance, and Monitoring Plan, ./. fl. Baxter South Property 4.2 Schedule Figure 4-2 presents a flow chart outlining the compliance monitoring plan and contingent action implementation and also provides the sampling schedule. Because samples from shoreline wells currently meet cleanup criteria, the need for implementation of contingent remedies is not anticipated. The compliance monitoring plan does, however, provide provisions for contingent remedial action; the specific actions will be evaluated as needed. · The compliance monitoring plan consists of quarterly confirmation monitoring of shoreline wells until four consecutive sampling events show no • exceedances of cleanup levels. Semiannual sampling is then initiated until two consecutive years of sampling result in no exceedances of cleanup levels. Annual sampling is then initiated until two additional consecutive years of sampling show no cleanup level exceedances. Thereafter, sampling will be performed every 5 years until monitoring has been performed for a total of 30 years. At any time during the monitoring schedule, if an exceedance is observed in a shoreline well, confirmation sampling will be performed within 60 days of the original sampling. If the concentrations decrease below cleanup levels, the original monitoring schedule is resumed. If, after the first year of monitoring, the confirmation sampling confirms the exceedance, PQC will consult with Ecology regarding implementation of a contingent remedy. 4.3 Data Evaluation and Reporting Compliance monitoring data will be reviewed as collected and a summary report will be prepared for each groundwater sampling event. Data will be evaluated to ascertain trends in groundwater concentrations, determine whether cleanup levels are continuing to be met, and whether modifications to the monitoring schedule are necessary, as outlined above and shown in Figure 4-2. Provisions for periodic review and Ecology oversight payment are included in the Consent Decree. JAGC0-02438-895 4-2 Table 4-1 Potential Cleanup Levels for Groundwater (g/L) Contaminant of Concem MCL MTCA MTCA MTCA Fresh Water Quality (EPA, Method A Method 8 Method B Criteria/Standards 1996) Groundwater Groundwater' Surface (40 CFR 131)' (WAC 173-340) (WAC 173-340) Water' Acute/ Human (WAC 173-Chronic Consumption 340) of Oraanisms Naphthalene --320 9,880 -- Acenaphthylene ------ Acenaphthene --960 643 -- Fluorene --640 3,460 -14,000 Phenanthrene ------ Anthracene --4,800 25,900 -110,000 Fluoranthene --640 90.2 -370 Pyrene --480 2,590 -11,000 Benzo(a)anthracene -0.1 • 0.012 0.0296 -0.031 Chrysene -0.1 • 0.012 0.0296 -0.031 Benzo(b)fluoranthene -0.1 • 0.012 0.0296 -0.031 Benzo(k)fluoranthene -0.1 • 0.012 0.0296 -0.031 Benzo(a)pyrene 0.2 0.1 • 0.012 0.0296 -0.031 Dibenzo(a,h)anthracene -0.1 • 0.012 0.0296 -0.031 Benzo(g,h,i)peryiene ------ lndeno(1,2,3-cd)pyrene -0.1' 0.012 0.0296 -0.031 Pentachlorophenol --0.729 4.91 20/7.9° 8.2 NOTES: • Value for carcinogenic PAHs. ' Values obtained from MTCA Cleanup Levels and Risk Calculations (CLARC II) update. ' AWQC, EPA. 1997. Human health (10 .. risk for carcinogens) for consumption of organisms only. ' PQL estimated based on a survey of local laboratories using EPA Method 8270 SIM. • Pentachlorophenol chronic criteria based on pH-dependent formula (exp(1.005(pH)-5.290)) at pH 7.8. JAGC0-02418~, Estimated Practical Selected Quantitation Quantltatlon Cleanup Limit Limit" Level (SW-846, Nov. 1992) 10 0.3 9,880 10 0.1 - 10 0.1 643 10 0.1 3,460 10 0.1 - 10 0.1 25,900 10 0.3 90.2 10 0.3 2,590 10 0.1 0.1 10 0.1 0.1 10 0.1 0.1 10 0.1 0.1 10 0.1 0. 1 10 0.1 0.1 10 0.1 - 1d 0.1 0.1 50 -4.91 4-3. // ' ' '"'C.,"'l:{~l),. .J·,~· ;o,i,,(!~ ' ~i2' / BAX-6S '<- 00' ""- "-.. 1 "' QJ ',"' .......... "'---'"' .......... "'--'"..... ' •Rrnc DATE: 5/10/01 ' "' ' "' ' ::.I I J,H. BAXTER JAGC0-0243Ull5 DRWN: A.S./SEA LEGEND • COMPLIANCE MONITORING WELL BAXTER COVE I I / I / "' I I i I i I ,1 I ·./"' I ~~ .' -I 1,: / ."v I "v I hj ~/ < I I I I I ·' t N a ,1 0 50 100 200 SCALE IN FEET ' I t. I COMPLIANCE MONITORING NETWORK I LA>l>I" Loyoull .. ~~··---I= 24J8SJ6J J FJGURE4-1 DISCONTINUE MONITORING AT THIS LOCATION WAC Wl>C INSTALt APPROPRIATE'. NO NO NO NO SHOREUNE WELLS QUARTERLY SAMPLING Al SHORELINE YES SEMI-ANNUAL SAMPLING Al SHORELINE Y[S ANNUAL SA~PLING AT SHORELINE YES SAMPLING EVERY 5 YEARS Al SHORELINE YES YES 17J-J40-'20(8)((:)(iv) 173-340-J60(8)(b) cm..inRMATION SAMPLING < 60 OAYS CONF"!R~ATION SAMPLING < 60 DAYS CONFIRMATION SAMPLING < 60 DAYS CONFIRMATION :SAMPLING < 60 DAYS DATE: 5/10/01 CONFIRMATION MONITORING YES NO NO YES NO YES NO JAGC0-02438-a95 YES YES YES YES ORWN; A.S./SEA FILE: 24381012 YES NO NOTES: 1. GROUNDWATER DEFINED IN THE PLAN. CONFER WITH ECOt.OGY REGARDING POT(NT~L CONTINGENT R£ME"OIES CLEANUP LEVELS CLEANUP ACTION AS GROUNDWATER COMPLIANCE MONITORING FLOW CHART LAYOUT: loyou11 FIGURE4•2 5 Long Term Wetland Monitoring The long term monitoring of the wetlands are detailed in this section. The goal of the wetland mitigation is to establish communities of native plant species that require no routine maintenance after the plants have become successfully established. The planting contractor would be responsible for maintaining all plantings for a one-year period after installation before the final project acceptance is issued to the contractor. 5.1 Monitoring During the first monitoring survey, randomly selected 5-meter radius plots would be permanently established within the restored habitats to provide a representative sampling of the tree and shrub plantings. One-meter square plots would be established to monitor the emergent wetland plantings. The entire area would be visually inspected at the time of sample plot establishment to ensure that the plots are representative of site conditions. Information on survivorship and percent cover would be collected from inside the pennanent sample plots to judge the success of the restoration plantings. Information collected during each monitoring survey would not be of sufficient quantity or complexity to provide a statistical analysis for the project. However, it would be sufficient to adequately assess the success of the restoration efforts. Photo documentation stations would be permanently established either at the center of the pennanent sampling plots, or at other locations that provide representative views of the mitigation areas. Photographs taken at these photo stations would be used to document the establishment of planted materials and to illustrate plant community changes within the restored areas. Percent survivorship for the project would be calculated through a direct count of all dead and severely stressed plantings within the permanent sample plots. Plant vigor would be evaluated using the following categories: live; stressed; tip die-back; and dead. Live plants would be judged to be those with healthy, vigorous stems, and adequate succulent foliage. Plants having sparse or desiccated foliage, significantly damaged twigs, sunburn or sunscald, etc. would be assigned to the stressed category. Plants suffering from significant stem mortality, especially the leader and/or main stem, would be placed within the tip die-back category. Plants found to support no foliage or live stems would be assigned to the dead category. Severely stressed plants and plants with tip die-back and no healthy basal sprouts or side branches would be considered dead for that monitoring period. During the first year following restoration, monitoring would occur during early spring before lake water levels rise and late summer before lake water levels are lowered. The focus of the initial spring monitoring survey would be to assess the suitability of the planting location selected for a particular plant JAGC0-02438-895 5-1 Inspection, Maintenance, and Monitoring Plan, J.H. Baxter South Property species in relation to the lake water levels during the early growing season. Additionally, general observations of wildlife use of the enhanced habitat would also be noted. Photographs would be taken at each of the permanent photo stations during each monitoring survey, and current photographs from these photo stations would be included in the report prepared for that particular monitoring survey. The initial spring monitoring survey would be to assess the suitability of the planting location selected for a particular plant species in relation to the lake water levels. 5.2 Monitoring Schedule , A qualified biologist would conduct all monitoring surveys. Monitoring and reporting would be conducted over a 10-year period as follows: · l) Immediately after plant installation to provide an as-built plan. The as- built review would include the establishment of the photo stations and documentation of the distribution of plant materials; 2) Early spring (i.e., March, April) and late summer (e.g., September) of the first growing season; 3) Late summer of the second growing season; 4) Late summer of the fifth growing season; 5) Late summer of the seventh growing season; and 6) Late summer of the tenth growing season. 5.3 Monitoring Reporting The as-built report for the restored habitats would be submitted to the reviewing agency when completed, and all subsequent written reports would be submitted to the reviewing agency no later than October 15th of the monitoring year for review and approval. The written reports would include: • Condition of plants, including survivorship, percent cover, health, and vigor. Rationale for poor condition of plants, if present, would be determined and recommendations to rectify these conditions would be provided in the report. A discussion of the natural establishment of species not included in the planting plants (desirable and weedy species) would also be provided. • Observations of wildlife use. • Photo documentation from the permanently established photo stations. • Overall condition of the restored habitats and nearshore habitat, including indications of erosion, human disturbance, etc. JAGC0-02438-895 S-2 Inspection, Maintenance, and Monitoring Plan, J.H. Baxter South Property 5.4 Contingency Plans Appropriate contingency plans would be developed as necessary to correct problems identified during the monitoring (i.e., planting failures, shoreline erosion, etc.). If plant survivorship does not meet the established criteria, replanting would be conducted only after the reason for failure has been identified (e.g., poor planting stock, incorrect moisture regime, herbivory, disease, shade/sun conditions, hydrologic conditions, vandalism, plant competition, etc.). Any replanting effort required would occur between October 15th and March I 5th, or the following spring. All contingency plans would be submitted to the reviewing agencies for their approval prior to , implementation. Therefore, timing of implementation would be dependent upon agency staff availability and scheduling. A report would also be submitted to the reviewing agencies following the implementation of any contingency plans. JAGC0-01438-895 5-3 Appendix A Sampling and Analysis Plan Appendix A Sampling Analysis Procedures South Baxter Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite #207 Seattle, WA 98134 Retec Project Number: JAGC0-02438-895 Prepared for: Port Quendall Company 505 Fifth Avenue South Seattle, WA 98104 April 5, 2002 Appendix A Sampling Analysis Procedures South Baxter Prepared by: The RETEC Group, Inc. 1011 S.W. Klickitat Way, Suite #207 Seattle, WA 98134 Retec Project Number: JAGC0-02438-895 Prepared for: Port Quendall Company 505 Fifth Avenue South Seattle, WA 98104 Reviewed by: &~~41& Grant Hainsworth, P .E., Project Manager April 5, 2002 P:\DOCSl2431l\89S\Fina11SAP AppA IM Plan.doc Table of Contents A. l Introduction .................................................................................................... J-1 A.2 Groundwater Sample Collection .............................................................. , ..... 2-1 A.2.1 Purpose and Applicability .................................................................. 2-1 A.2.2 Responsibilities .................................................................................. 2-1 A.2.3 Supporting Materials .......................................................................... 2-1 A.2.4 Fluid Level Measurement .................................................................. 2-1 A.2.5 Well Purging Procedures ................................................................... 2-2 A.2.6 Low-Flow Purging Method ................................................................ 2-2 · A.2.7 Groundwater Sample Collection ........................................................ 2-3 A.2.8 Documentation ................................................................................... 2-6 A.3 Groundwater .................................................................................................. 3-1 A.3.1 Purpose and Applicability .................................................................. 3-1 A.3.2 Responsibilities .................................................................................. 3-1 A.3.3 Supporting Materials .......................................................................... 3-1 A.3.4 Water Level ........................................................................................ 3-1 A.3.5 Documentation ................................................................................... 3-2 A.4 Decontamination ............................................................................................ 4-1 A.4. l Purpose and Applicability .................................................................. 4-1 A.4.2 Responsibilities .................................................................................. 4-1 A.4.3 Supporting Materials .......................................................................... 4-I A.4.4 Methods .............................................................................................. 4-2 A.5 Sample Preservation, Handling, and Analysis ............................................... 5-1 A.5.1 Purpose and Applicability .................................................................. 5-1 A.5.2 Responsibilities .................................................................................. 5-1 A.5.3 Supporting Materials .......................................................................... 5-1 A.5.4 Sample Containers and Preservatives ................................................ 5-1 A.5.5 Sample Handling Procedures ............................................................. 5-2 A.5.6 Chain of Custody Procedures ............................................................. 5-2 A.5.7 Analytical Methods ............................................................................ 5-3 A.6 Quality Assurance/Quality Control Procedures ............................................. 6-1 A.6.1 Purpose and Applicability .................................................................. 6-1 A.6.2 Responsibilities .................................................................................. 6-1 A.6.3 Training .............................................................................................. 6-2 A.6.4 Field Procedures and Sample Handling for Quality Assurance/Quality Control 6-2 A.6.5 Collection of Field Quality Assurance/Quality Control Samples ...... 6-2 A.6.6 Field Measurement Equipment.. ........................................................ 6-3 A.6.7 Project Documentation ....................................................................... 6-4 A.6.8 Internal Quality Control.. ................................................................... 6-4 A.6.9 Corrective Action ............................................................................... 6-4 JAGC0-02438-895 Table of Contents A.7 Data Validation and Reporting ...................................................................... 7-5 A.7.1 Data Validation .................................................................................. 7-5 A.7.2 Reporting ............................................................................................ 7-8 A.8 References ...................................................................................................... 8-1 JAGC0-02438-895 ii List of Tables Table A-1 Analytical Methods, Sample Containers, Preservation and Holding Times .............................................................. 2-6 Table A-2 Reporting Limits for Specified Methods ................................................. 5-3 JAGC0-02438-895 iii List of Figures Figure A-1 Groundwater Sampling Log ..................................................................... 2-5 Figure A-2 Well Gauging Log ................................................................................... 4-3 JAGC0-02438-lJ95 iv A.1 Introduction The purpose of the Sampling and Analysis Plan (SAP) is to provide consistent and defensible procedures that will be followed during groundwater compliance and performance monitoring at the Baxter North and South Properties. The SAP discusses field sampling procedures and q1.1ality assurance measures. This SAP describes procedures for: • Groundwater sample collection; • Groundwater elevation monitoring; • Equipment and personnel decontamination; • Sample preservation, handling, and analysis; • Quality assurance/quality control procedures; and • Data management, assessment, and analysis. The SAP was prepared following WAC 173-340-820 guidelines. The project schedule and identification and justification of sampling locations are included in _the Groundwater Compliance Monitoring Plan. JAGC0-02438-895 1-1 A.2Groundwater Sample Collection A.2.1 Purpose and Applicability Monitoring wells will be sampled to characterize the quality of groundwater being discharged to Lake Washington. During the sampling events, wells will be purged and groundwater sampled using a low-flow sampling method. A.2.2 Responsibilities The project scientist will have the responsibility of overseeing sampling and ensuring that all groundwater sampling is performed in accordance with this plan. A.2.3 Supporting Materials The list below identifies the types of equipment for groundwater sampling of monitoring wells: • ,Low-flow rate pump (peristaltic pump or dedicated bladder pump); • Meters appropriate for pH, specific conductance, temperature, dissolved oxygen, redox potential, and turbidity measurements; • Water level measurement equipment; • Decontamination solutions; • Field data sheets and log book; • Pressure filtration equipment; • Sample containers; • Personal protection equipment; • Buckets and intermediate containers; and • Coolers. A.2.4 Fluid Level Measurement After unlocking and opening a monitoring well, the first task is to obtain a water level measurement. Water level measurements will be made using the procedures described in Section A.3. Water level measuring instruments must be decontaminated before and immediately after use in a monitoring well using the procedures described in Section A.4. JAGC0-02438-895 2-1 Appendix A · SampUng Analysis Procedures, South Baxter A.2.5 Well Purging Procedures Purging must be performed for all groundwater monitoring wells before sample collection. Wells will be purged by pumping. For new wells, purging and sampling will be delayed a minimum of 24 hours after well development. Any non-dedicated equipment that is placed in the well must be thoroughly decontaminated before and after use. A.2.6 Low-Flow Purging Method Previous sampling activities conducted at the adjacent site demonstrated · effective low-flow purging and sampling at rates less than 0.3 liters per minute. Purging and sampling will be conducted during groundwater compliance monitoring using low-flow rates from 0.2 to 0.3 liters per minute. Low-flow sampling methods will limit suspension of sediment that may accumulate at the bottom of the monitoring well and introduce representative groundwater into the well screen. The pump intake will be set near the midpoint of the well screen, and the level of the water table in the monitoring well will be measured to determine the maximum sustainable pumping rate. The maximum sustainable pumping rate will be defined as the rate which does not lower the water table by more than six inches. This method ensures that the water that is being pumped from the well is flowing through the well screen and not from within the well. Purge water will be monitored for pH, conductivity, temperature, dissolved oxygen, redox potential, and turbidity. All parameters except turbidity will be measured using an in-line flow cell. Turbidity will be measured with a nephelometer immediately prior to sample collection. Meters will be calibrated prior to beginning sampling each day. Field parameter values will be entered on the Groundwater Sample Collection Record along with the corresponding purge volume. Liquid removed from the well will be pumped into a portable water tank or drums for temporary storage, then moved into a vacuum truck for disposal at an approved facility. Monitoring wells will be purged and sampled using a peristaltic pump with clean tubing. Peristaltic pump tubing will be decontaminated or replaced between wells. Field parameter measurements will be obtained throughout the purge period to assure that groundwater entering the well is representative of the aquifer. The well will be sampled after at least two consecutive parameter measurements made 3 minutes apart are within 10 percent of each other. Monitoring wells will be purged according to the following procedures: I) Check and record the condition of the well for damage or evidence of tampering. 2) Unlock the wellhead and remove the casing cap. JAGC0-02438-895 2-2 Appendix A -Sampling Analysis Procedures, Soulh Baxter 3) Measure and record the depth to water with an electronic water level device. Do not measure the depth to the bottom of the well at this time to avoid disturbing sediment that may have accumulated. 4) Recheck and record the depth to water after approximately 5 minutes. If the measurement has changed more than 0.02 feet, check and record the measurement again. 5) Attach the tubing to the pump and slowly lower the pump or hose into the well. Place the inlet at the midpoint of the screen 6) Start pumping the well at a rate of 0.2 to 0.3 liters per minute and maintain a steady flow rate. 7) Monitor the water level in the well at frequent intervals. Ideally, the pump rate would equal the well recharge rate with little or no water level drawdown in the well. 8) Record the pumping rate, approximate volume pumped, and depths to water in the logbook. If the recharge rate of the well is very low and the water "level drops below the level of the inlet, then the sampler must wait until the well recharges to a sufficient level and then collect the appropriate volume of sample. 9) Monitor dissolved oxygen and redox potential during purging. Monitor turbidity prior to sample collection. Dissolved oxygen and redox potential will be measured using an in-line meter. The parameters should be monitored for every sample tube volume (tubing from the pump outlet to the point of discharge). Once at least two successive readings of the parameters agree within IO percent, then the purge water is considered stabilized and sampling may begin. A.2.7 Groundwater Sample Collection Samples will be placed directly into the proper sample containers. Sample bottles will be prepared by the analytical laboratory. The laboratory~s preparation will include addition of the appropriate preservatives to the sample bottles according to the EPA document Handbook for Sampling and Sample Preservation of Water and Wastewater (EPA-600/4-82-029). All samples will be handled according to the procedures described in Section A.5. Groundwater samples will be collected using a low-flow method in order to minimize the disturbance of particulate material that has settled at the bottom of wells. The samples will be collected directly from the pump in laboratory- provided sample containers. Groundwater samples for PAHs and PCPs will be field-filtered due to contribution of suspended solids to P AH concentrations in previous investigations. ASampling results, combined with leachability data described in Section 3.5 indicate that carcinogenic PAHs are JAGC0-02438-895 2-3 Appendix A -Sampling Analysis Procedures, Soulh Baxter not dissolved in groundwater. Low-level concentrations are thought to be associated with suspended solids in groundwater samples@ (EPRI, Section 3.3.2, 1999). In-line filtration is preferred whenever practical because it provides better consistency through less sample handling, and minimizes sample exposure to the atmosphere. Wells will be sampled according to the following procedures: I. After purging the monitoring well as described above and after the parameters have stabilized, fill the sample bottles. Samples collected for PAH and PCP analysis will be filtered using an in-line · disposable 0.45-micron filter when possible. Samples should be filled directly from the tubing unless filtering must be conducted using an off-line filter. 2. When all the sample containers have been filled and before turning the pump off, measure and record the turbidity, dissolved oxygen, redox potential, pH, conductivity, and temperature. Record these readings in the logbook. 3. Remove equipment from the well. 4. Close and lock the well. 5. Between sampling locations, all nondedicated sampling equipment must be disposed of or decontaminated At least one duplicate sample shall be collected for each round of sampling. Duplicate water samples will be collected by filling two containers (or sets of containers) simultaneously from the sampler. Duplicate samples will be analyzed for the full set of constituents being tested. A set of field blanks will also be collected and analyzed for the full set of constituents being tested. Field blanks are collected by transferring deionized water into the appropriate sample container at the sampling site. Field blank and field duplicate samples will not be labeled as blanks or duplicates on the sample labels or chain of custody forms, but will be identified as such in the field logbook and on the groundwater sampling logs (Figure A-1 ). Table A-l outlines analytical methods, sample containers, preservation, and holding times for sampling parameters. JAGC0-02438-895 2-4 Figure A-1 Groundwater Sampling Log PROJECT NAME PROJECT NO. DATE DEPTH TO WATER DEPTHOFWEU WELL DIAMETER FEET OF WATER CASING VOLUME• PURGE VOLUME PRODUCT THICK CONDITION START PURGE TIME: VOL PURGED TIME FlOWRATE (units) CONDUCTIVITY umhos/cm) TEMP.(C WATERCOLOR PURGE AND SAMPLE EQUIPT: AODITIONAL INFORMATION: TOC-Top of well casing wl.prot=top of wen proteetor (TOC-fl) (wl.prot.-tt) (ft (Inches) (gaQ (gaO (fl) •casing votuma=HLJ2i!ti(ft)x7.48gallftlBt,3I WELL NO. SAMPLED BY ' Appendix A -Sampling Analysis Procedur(!s, South Baxter Table A-1 Analytical Methods, Sample Containers, Preservation and Holding Times Holding Parameter Matrix EPA Method Container Preservative Time Semivolatile Water 8270 (SIM) 1-llter 4°c 7 days' Organics Amber (Field Filter) Glass Notes: / Holding time for extraction Ferrous Iron analyzed by Standard Methods Parameters listed together to be sampled in same container If preserved sample bottles were not supplied by the laboratory, groundwater samples will be preserved in the field prior to packaging and shipment to the laboratory. Sample preservation requirements are discussed in Section A.5, Sample Containers and Preservatives. Sample bottles will be labeled, sealed in separate Ziploc plastic bags to assess leakage, and placed on ice to obtain and maintain a maximum temperature of 4 °C. Samples will be shipped overnight to the laboratory or dropped off at the laboratory at the end of the day. It should be noted that if sample temperatures are above 4°C and are quickly transported to the laboratory, they may not reach a temperature of 4°C prior to arriving at the laboratory. · A.2.8 Documentation Documents will be completed and maintained to provide a summary of the sample collection procedures and conditions, shipment method, the analyses requested, and the custody history. The documents are: • Field logbook; • Groundwater sampling log; • Sample labels; • Chain of custody; and • Shipping receipts . The groundwater sampling log will include the following information: • Description of sample location; • Date and time of sampling; JAOCO-OUJ8-895 2-6 Appendix A -Sampling Analysis Procedures, South Baxter • Name of samplers; • Weather conditions; • Description of sampling equipment; • Sample numbers and analyses; and • Any different and unusual observations. A groundwater sample collection record is included as Figure A-1. In addition, the labels affixed to the sample bottles will document the following information: • Sampler's name or initials; • Date and time of sample collection; • .· Sample location; and • Unique sample number. JAGC0-02438-895 2-7 A.3Groundwater A.3.1 Purpose and Applicability Groundwater levels will be measured during water sampling to characterize groundwater flow directions at the Site. A.3.2 Responsibilities The project scientist will have the responsibility of overseeing groundwater , elevation monitoring and ensuring that all monitoring is performed in accordance with this plan. A.3.3 Supporting Materials The list below identifies the types of equipment for water level elevation in the monitoring wells: • Water level measurement device; • Decontamination solutions; • Logbook; and • Well gauging forms. A.3.4 Water Level Water level measurements will be made using either an electronic water level meter or an intrinsically safe electronic oil/water interface gauging probe if light nonaqueous-phase liquid (LNAPL) or dense nonaqueous-phase liquid (DNAPL) are suspected or known to be present. Water level measurements will be made in selected wells as outlined in Table 3-2 of the Groundwater Compliance Monitoring Plan. The measuring point location for the well should be clearly marked on the well casing or identified in previous sample collection records. If no measuring point can be determined, the northern edge of the casing should be the measuring point. Typically the top of the protective or outermost well casing will be used as the measuring point. The measuring point location should be described on the Well Gauging Log (Figure A-2). To obtain fluid level measurements, lower the decontaminated electronic sounding unit into the monitoring well until the water surface is detected. The precise measurement should be determined by repeatedly raising and lowering the tape or cable to converge on the exact measurement. The water I eve! should be entered on the Well Gauging Log. The sounding unit shall be decontaminated immediately after use. JAGC0-02438-895 3-1 Appendix A -Sampling Analysis Procedures, South Bax/er A.3.5 Documentation The documents which will be completed and maintained to provide a summary of the water level measurement procedures include: • Field logbook; and • Well gauging log. JAGC0-02438-895 3-2 A.4 Decontamination A.4.1 Purpose and Applicability Decontamination is performed as a quality assurance measure and a safety precaution. It prevents cross contamination between samples and also helps to maintain a clean working environment. The purpose of decontamination is to remove contaminated materials clinging to gloves, boots, equipment and sample containers prior to their removal from , the work area. Decontamination also includes the removal and disposal of any contaminated clothing, gloves and respirator cartridges. Decontamination is achieved mainly by rinsing with liquids which include: soap and or detergent solutions, tap water, and deionized water. Equipment will be allowed to air dry after being cleaned. Decontamination will be accomplished between each sample collection point. Waste products produced by the decontamination' procedures such as waste liquids, solids, rags, gloves, etc. will be collected and disposed of properly based on the nature of contamination. A.4.2 Responsibilities The project scientist is responsible for assuring that the proper decontamination procedures are followed and that all waste materials produced by decontamination are properly containerized and labeled. The project scientist is responsible for enforcing safety measures which provide the best protection for all persons involved directly with sampling and or decontamination. Subcontractors (e.g., drilling contractors) will be responsible for following the proper, designated decontamination procedures that are stated in their contracts and outlined in the Project Health and Safety Plan. All personnel involved with sample collection or decontamination are responsible for maintaining a clean working environment and ensuring that any contaminants are not negligently introduced to the environment. A.4.3 Supporting Materials • Cleaning liquids and dispensers: soap and/or detergent solutions, tap water, deionized water, methanol or acetone; • Waste storage containers: drums, boxes, plastic bags; • Cleaning containers: plastic, galvanized steel and/or stainless steel pans and buckets; and • Cleaning brushes. JAGC0-02438-895 4-1 Appendix A • Sampling Analysis Procedures, South Baxter A.4.4 Methods This section describes the methods to be used for the decontamination of all non-disposable field equipment which becomes potentially contaminated during a sample collection task. The extent of known contamination will determine the degree of decontamination required. If the extent of contamination cannot be readily determined, cleaning should be done according to the assumption that the equipment is highly contaminated. The standard procedures listed below can be considered the procedure for full field decontamination. If different or more elaborate procedures are required for an unexpected situation, they will be determined by the project scientisL Such variations in decontamination may include expanding the scope of the decontamination procedure stated herein. 1) Remove gross contamination from the equipment by brushing. 2) Rinse '!,Vith tap water. 3) Wash with soap or detergent solution. 4) Rinse with tap water. 5) Double rinse with deionized water. 6) Repeat entire procedure or any parts of the procedure as necessary. JAGC0-02438-895 4-2 Figure A-2 Well Gauging Log PROJECT NAME:---------DATE: PROJECT NO: ________ _ RECORDED SY:--------- REFERENCE POINT DEPTH OF DEPTH TO NAPL WELL DATE TIME FOP WATER COMMENTS MEASUREMENT CASING LNAPL DNAPL A.5Sample Preservation, Handling, and Analysis A.5.1 Purpose and Applicability This section discusses sample preservation and analysis methods which will be used to assess groundwater quality at the site. Proper packaging· and shipment procedures for environmental samples collected during the sampling to minimize the potential for sample breakage, leakage or cross contamination. Chain of custody procedures are followed to provide a clear record of sample custody from collection to analysis. Sample handling and chain of custody procedures are also discussed. A.5.2 Responsibilities . The project scientist shall be responsible for the enactment and completion of the sample preservation, chain of custody and the packaging and shipping requirements outlined here. The laboratory project manager will be responsible for ensuring that samples are analyzed according to the specified EPA method protocol. A.5.3 Supporting Materials • Chain of custody forms; • Sturdy, insulated coolers; • Packaging tape; • Ziploc-type bags; • Protective wrapping and packaging materials; and • Ice or blue ice. A.5.4 Sample Containers and Preservatives The required sample containers and preservation procedures are in accordance with the requirements of EPA protocols outlined in OSWER Directive #9240.0-05 (1990). Sample containers and preservatives to be used in the sampling program are summarized in Table A-1. All samples will be kept on ice or refrigerated from the time of collection until analysis. Once cooled down after collection, samples will be maintained at a maximum temperature of4EC. JAGCO..OU38-895 5-1 Appendix A • Sampling Analysis Procedures, South Baxter A.5.5 Sample Handling Procedures All samples must be packaged so that they do not leak, break or vaporize. All samples must be properly identified and each shipment or transfer must be accompanied by a chain of custody record. All samples are to be clearly identified immediately upon collection. Each sample bottle should include the following information: • Client or project name; • Monitoring well identification; • Sample number/identification; • Sample location; • Sample collection date and time; and • Sampler's name or initials. The data shall be similarly recorded on the sample log sheets or field logbook. After samples are collected, identified and preserved in the field, they are placed in a cooler and chilled to 4°C using ice or blue ice. The EPA RCRA regulations (40 CFR Section 261.4 (d)) specify that samples of solid waste, water, soil, or air collected for the purpose of testing are exempt from regulation when the following conditions apply: • Samples are being transported to a laboratory for analysis; • Samples are being transported to the collector from the laboratory after analysis; and • Samples are being stored: I) by the collector prior to shipment for analyses, 2) by the analytical laboratory prior to analyses, and 3) by the analytical laboratory after testing, but prior to return of sample to the collector or pending the conclusion of a court case. Samples to be collected during sampling are qualified for these exemptions. This plan deals only with these sample types. A.5.6 Chain of Custody Procedures All samples are maintained under chain of custody procedures. A sample is in custody if it is in your possession, in view or in a designated secure area. Sample custody transfers must be documented by chain of custody forms. Chain of custody forms are generally provided by the analytical laboratory. The following information must be included on chain of custody records: JAGC0-02438-895 5-2 Appendix A -Sampling Analysis Procedures, South Baxter • Sample collector's name, mailing address and telephone number; • Analytical laboratory's name, mailing address and telephone number; • Description of each sample, including sample number and matrix; • Quantity of each sample and type of analysis required; and • Date of collection and of shipment. When transferring the custody of samples, the individuals relinquishing and receiving will sign, date and note the time on the form. A.5.7 Analytical Methods Samples .will be collected, preserved and analyzed by standard U.S. EPA analytical methods (fable A-1). Consistency in analytical method allows for comparison of previous and subsequent data. Samples will be analyzed by the methods summarized listed in Table A-2. The reporting limit for a given parameter is determined by procedures specified in the method and will be evaluated as a part of data validation. Table A-2 summarizes the appropriate methods of analysis and the method reporting limits. These reporting limits will be observed for all laboratory analyses performed during this project, except where matrix interferences and high concentrations of target and non-target compounds increase the reporting limits. Table A-2 Reporting Limits for Specified Methods Parameter Methods Reporting Limits Po/yaromatic Hydrocarbons EPA 8270 SIM t•I (µ.g/L) Naphthalene 0.1 (2) Benzo(a)anthracene 0.1 (2) Chrysene 0.1 (>} Benzo(b)fluoranthene 0.1 (2) Benzo(k)fluoranthene 0.1 .. 1 lndeno(1,2,3-cd)pyrene 0.1 .. 1 Dibenzo(a,h)anthracene 0.1 f.lJ JAGC0-02438-895 5-3 Appendix A -Sampling Analysis Procedures, South Baxter Parameter Methods Reporting Limits Benzo(g,h,i)perylene 0.1 ,-, Pentach/orophenol EPA 8270 SIM Pl Notes: 1) Will use alternative methods as appropriate per WAC 173-340-707. 2) laboratory reporting limits may be higher due to the presence of co- contamination at elevated concentrations. Rls do not need to be lower-than clean-up levels to fulfill compliance-monitoring requirements. JAGC0-02438-895 5-4 A.6Quality Assurance/Quality Control Procedures This section describes the quality assurance (QA) and quality control (QC) procedures and documentation for the compliance monitoring program. QA/QC procedures for groundwater sampling and laboratory practices are discussed. A detailed discussion of data validation is discussed in Section A.7. Further detail on the purpose, scope and methodology of the proposed monitoring program is provided in the Groundwater Compliance Monitoring Plan. A.6.1 Purpose and Applicability Data quality objectives (DQ0s) have been established to ensure that data generated during compliance monitoring are adequate to support the decisions and conclusions of the evaluation. Analytical data will be reviewed relative to QA/QC objectives to ensure defensible data of acceptable quality are provided for the inte.nded use. The specific objectives of the quality assurance program are to: • Provide an estimate of analytical precision and accuracy of laboratory test results, and • Provide verification of the occurrence of contaminants in groundwater. Methods utilized to produce quality chemical data include, but are not limited to, field blanks, duplicate samples, laboratory QA/QC procedures, instrument calibration, equipment decontamination, sample preservation, chain of custody procedures, and data validation procedures. A.6.2 Responsibilities The field team is responsible for familiarizing themselves with the sampling program and following the detailed field procedures that are needed to maintain QA/QC. The project hydrogeologist or engineer is responsible for insuring that field team members follow strict equipment calibration, sample collection, sample handling, and decontamination procedures, and for reviewing field logs for completeness and accuracy. The project manager is responsible for the quality of work performed on this project. The project manager will review, or appoint a QA/QC officer to review, the field products and analytical products and deliverables for conformance to established limits and agreed to structures. JAGC0-02438-895 6-1 Appendix A ', Sampling Analysis Procedures, South Baxter A.6.3 Training All personnel collecting samples on the Baxter North and South Properties will be properly trained in accordance with the most recent OSHA hazardous materials and safety training requirements. Prior to commencement of work, personnel will be given instruction specific to this project, covering the following areas: • Organization and lines of communication and authority; • Overview of the Sampling Plan; • Decontamination requirements; and • Overview of Health and Safety considerations. This training, which is specific to the Site, will be conducted by the project manager. A.6.4 Field Procedures and Sample Handling for Quality Assurance/Quality Control The achievement of data quality and quality assurance objectives depends on the capability to produce valid data and to demonstrate such validity. Proper sample collection, identification, preservation, storage and handling procedures, and chain of custody records are necessary to help support the validity of the data. Procedures for these steps are discussed in previous sections of this sampling plan as follows: • Proper collection of groundwater samples are discussed in Section A.2 • Proper sample identification, preservation, storage, handling and chain of custody procedures are discussed in Section A.5. In addition to sample labels and chain of custody forms, a bound field logbook will be maintained by the field sampling coordinator and each sampling team member to provide a daily record of significant events. All entries will be signed and dated. The logbook will be kept as a permanent record. RETEC has specific forms to be used to record the collection of groundwater samples. A.6.5 Collection of Field Quality Assurance/Quality Control Samples Groundwater samples will be collected in accordance with Section A.2 of this plan. Field blanks and duplicate samples will be collected as described below. JAGC0-02438-S95 6-2 Appendix A -Sampling Analysis Procedures, South Baxter Field blank and field duplicate samples will not be labeled as blanks or duplicates on the sample labels or chain of custody forms, but will be identified as such in the field notebook and on the sample logs. Field blanks are collected by transferring deionized water into the appropriate sample container at a sampling site, and then sealing, labeling and shipping it with the samples. The deionized water is carried to the field in a sealed airtight container. The source of deionized water should be documented; and preferably be from the laboratory that will analyze the samples. Field blanks will be analyzed for the full set of constituents being tested. At least one duplicate sample shall be collected for each round of sampling. Duplicate water samples will be collected by filling two containers ( cir sets of containers) simultaneously from the sampler. Duplicate samples will be analyzed for the full set of constituents being tested. Sample containers will not be pre-rinsed with sample. Sample containers for volatile constituents wlll be filled to capacity, with no air bubbles. All sample collection apparatus will be fully decontaminated, in accordance with the procedures outlined in Section A.4 before sampling and between sampling points. A.6.6 Field Measurement Equipment Measurements of dissolved oxygen, redox potential, temperature, pH and specific conductance of well purge water will be performed using in-line flow cells. Turbidity measurements will be performed with a nephelometer. This equipment will be calibrated each day of field activities and operated in accordance with manufacturers specifications. Quality control procedures for field instruments will be limited to checking the reproducibility of measurement to within IO percent by talcing multiple reading and periodic instrument calibration. If the variability among multiple readings at a single site is greater than IO percent, the instrument will be recalibrated, if appropriate, and the measurement repeated. Equipment that fails calibration or becomes inoperable during use will be removed from service, tagged to indicate that it is out of calibration, and segregated to prevent inadvertent use. Such equipment will be repaired and recalibrated or replaced as appropriate. Results of activities performed using equipment that has failed recalibration will be evaluated by the project scientist." If the activity results are adversely affected, the results of the evaluation will be documented, and the appropriate personnel notified. If pH, conductivity, or temperature meters fail recalibration, the data will be reviewed to detennine whether alternate parameter data are sufficient to accept the groundwater sampling results. For instance, if the conductivity meter fails recalibration, pH and temperature JAGC0-02438-895 6-3 Appendix A • Sampling Analysis Procedures, South Baxrer readings will be used to verify that the purge water has stabilized. Since these parameters are calibrated prior to each use, it is unlikely that the data will be unacceptable. All field measurement equipment will be controlled to ensure that measurements obtained are accurate and defensible and will be operated by trained personnel, in accordance with manufacturers recommendations .. All field record sheets, instrument outputs, and worksheets for calculating results will be retained. Summarized raw data will be appropriately identified and included in a separate appendix to the final report. Project Documentation All documentation for the project will be recorded in non-erasable ink. All documents will be signed by the person completing them. No erasures or white outs will be made; entry errors will be crossed out with a single line and initialed by the person making the correction. A.6.8 Internal Quality Control Project quality rests with every person involved; however, primary responsibility for project quality rests with the project manager. Overall project quality and consistency is achievable when all parties follow this plan, and other appropriate guidance. Field blanks and sample duplicates will be collected and submitted to the laboratory for analysis to determine if sample contamination is introduced during sampling activities and to check field precision. All numerical analysis, mapping, computer modeling and reports will be subject to peer review. All analytical calculations will be legible and complete enough to permit logical reconstruction by a qualified individual other than the originator. Informal peer review is strongly encouraged during all phases of work. Formal peer review will occur prior to presentation or submittal of any data or conclusions. At the completion of a formal peer review, the reviewer will provide written documentation of the review and of any recommended revisions. A.6.9 Corrective Action In the event that quality is not met, action will be taken to correct the problem. If the problem is laboratory related, corrective action responsibility lies with the laboratory. The project manager and/or the QA reviewer are responsible for all other corrective action. If the problem is associated with interpretations, the project manager is responsible. Any corrective action taken will be documented and the impact of the problem(s) on data quality and interpretation will be summarized in corrective action memorandum(s ). Corrective action measures could include: JAGC0-02438-89S 6-4 Appendix A -Sampling Analysis Procedures, South Baxter • Reanalyzing samples if holding time criteria pennit; • Resampling and analyzing; or • Evaluating and amending sampling and analytical procedures. A. 7 Data Validation and Reporting A.7.1 Data Validation Data validation will be conducted on all analytical laboratory results. The laboratory generating the analytical data has the prime responsibility for the correctness and completeness of the data. Evaluation of data quality will be conducted based on both the results of the QC data and the professional judgment of the reviewer. The objective of the data validation is to identify any qualitative, unreliable, or invalid laboratory measurements. If quality 'control audits result in the detection of unacceptable data, the project manager will be responsible for initiating corrective action, which may include: • Reanalyzing samples if holding time criteria pennit; • Resampling and analyzing; • Evaluating and amending sampling and analytical procedures; and • Accepting data and acknowledging the level of uncertainty. EPA level III data validation will be used to evaluate laboratory data. Level III data validation is defined as assessing data quality using the quality control results submitted by the laboratory. Data validation entails a review of the laboratory-provided QC data to verify that the laboratory is properly performing the QC program and is operating within the required control limits. Any out-of-control data without appropriate corrective action may be cause to qualify or reject the affected measurement data. Laboratory data will be screened for inclusion of and frequency of the necessary QC supporting information such as reporting limit verification, duplicates, spikes, and reagent blanks. Missing or infrequent QC information will be cause to contact the laboratory concerning affected measurement data and to request additional QC supporting information or reanalysis. Data validation will review analytical data with respect to the following criteria: JAGC0-02438-895 7-5 Appendix A -Sampling Analysis Procedures, South Baxter • Completeness; • Comparability; • Representativeness; • Accuracy; and • Precision . . Completeness Completeness is defined as the percentage of measurements made which are judged to be valid measurements compared to the total number of measurements planned. The results will be calculated following data validation and reduction and will be used in planning subsequent sampling rounds. A completeness goal of 90 percent has been established for the Baxter North and South Properties compliance monitoring program. Additional sampling may be conducted to maintain project completeness goals. Comparability Comparability is an expression of the confidence with which one data set can be compared to another. The comparability objective for the monitoring program is to establish a database upon which decisions can be based and monitoring requirements can be modified, and to ensure that collected data is comparable to data obtained in subsequent sampling episodes. In the laboratory, standard analytical methods have been specified to allow comparison of data and to evaluate the effectiveness of remedial technologies. In the field, standard sampling techniques will be used to provide consistency between sampling episodes. The sampling techniques presented in the previous sections of this plan are consistent with the current standards of practice for similar monitoring programs. Representativeness Representativeness is a measure of the degree to which sample data represent selected site characteristics. Representativeness will be assessed for field activities, laboratory analysis, and the project as a whole. Field Representativeness. The objective in addressing field representativeness is to assess whether the information obtained during this monitoring program accurately represents the actual site conditions. The groundwater sampling program will provide information concerning water quality in the aquifers. The sampling procedures and field procedures in the previous sections of this plan describe proper sample collection techniques (containers, packing, etc.) JAGC0-02438-895 7-6 Appendix A -Sampling Analysis Procedures, Somh Baxrer and equipment decontamination procedures for obtaining representative samples. The representative nature of groundwater data is also assessed by collecting QA samples. Contamination introduced into samples through field sampling and site conditions will be evaluated through the collection of field blanks. Field blanks consist of deionized water sampled in the field, handled throughout the field activities, and submitted to the laboratory as if it were an analytical sample. The analytical results of the field blank samples will be compared to the results of the field samples to determine if the level of contamination is significant. The following criteria will be used to determine the effect of contamination on the usefulness of analytical results. Blank Contaminant Concentration Effect on Data Use <10 percent of parameter value in field sample Insignificant 10050 percent of parameter value in field Results will be considered qualitative sample >50 percent of parameter val.ue in field sample Results will be considered invalid Laboratory Representativeness. The objective of laboratory representativeness is to assure that the contamination levels determined in the laboratory accurately represent contamination levels present in the samples. Laboratory representativeness is assessed through QA samples including laboratory blanks, laboratory control and matrix control spikes, and good standard laboratory procedures. Field blanks and field duplicates will also serve as a measure of QA in the laboratory. QA samples are incorporated into the sampling program to provide information on external and cross contamination, sample representativeness, and laboratory analytical performance. Project Representativeness. The overall site data representativeness will be assessed through data interpretations. This involves a qualitative interpretation of whether the data seem reasonable considering the site conditions. Only representative data will be used in subsequent data reduction, validation activities, and site characterization. Invalidated data will be submitted to Ecology with the basis for invalidation. The evaluation of the project representativeness will be perfonned during preparation of monitoring reports. Accuracy Accuracy of analytical laboratory measurements will be assessed by analyzing standard reference materials or by spiking samples with known standards. Quality control samples used to assess accuracy including surrogates, JAGC0-02438-895 7-7 Appendix A -Sampling Analysis Procedures, South Baxler laboratory control samples, and/or matrix spikes. The accuracy will be determined as follows: • Computing percent recoveries for spiked samples; • Calculating the standard deviation in the overall average recovery value; and • Determining the range of uncertainty at a given level of confidence. · The accuracy of the data will be used to determine any bias in the analytical methods. Sample results will not be adjusted for bias, but the bias will be considered in the interpretation of the data. Precision Precision examines the distribution of reported values about their mean. The distribution of reported values measures the reproducibility of measurements under a given set of conditions. Precision may be affected by variation of the matrix, contamination within the matrix, or errors made during sampling or analysis. Analytical precision will be evaluated through the analysis of matrix spike and matrix spike duplicates, laboratory duplicates, and field duplicates. Matrix spike and matrix spike duplicates, and laboratory duplicates precision acceptance criteria are statistically determined by the laboratory and will be used to evaluate precision. Specific precision targets cannot be formulated for field duplicates without baseline precision data. However, the precision data will be summarized into the following categories. For each compound or element, the number of field duplicates with variance in the following ranges will be evaluated: • Less than IO percent; • IO to 25 percent; • 25 to 50 percent; and • Greater than 50 percent. This will provide qualitative infom1ation to the individuals interpreting the data as to the range of variances, and will also allow the proper planning for QC samples in future sampling episodes. A.7.2 Reporting The monitoring reports will include a summary of data reduction results and a discussion of any inconsistencies that exist from a data use standpoint. From JAGC0-02438-895 7-8 Appendix A -Sampling Analysis Procedures. Soulh Baxter these data results, the perfonnance of cleanup action and the existence and magnitude of groundwater impacts will be determined. All field data sheets and worksheets for calculating results will be included as an appendix in the final report. All raw data will be appropriately identified in reports and included in a separate appendix of the final report. JAGC0-02438-895 7-9 A.8 References OSWER, 1990. Revision of OSWER Directive #9240.0-05,. Specifications and Guidance for Obtaining Contaminant-free Sample Containers. Standard Methods, 1995. Srandard Methods for rhe Examination of Water.and Wastewater, J 9rh Edition. 8-1 MEMORANDUM TO: FROM: DATE: Gail Colburn -Eco~og)' Grant Hainsworth tjl,i May 16, 2002 CLIENT: TASK: RE: The RETE( Group, Inc. 101 l SW KlicMat Way, Suite 207 Seatlle, WA 98134-1162 .RETEC 206.624. 9349 Phone 206.624. 2839 Fax www.retec.com Port Quendall Company J.H. Baxter Property Basis for Filtering of Groundwater Samples for Compliance Monitoring This memorandum presents the technical rationale for filtering of groundwater samples for compliance monitoring at the J.H. Baxter Property in Renton, Washington. The purpose of this memorandum is to demonstrate that filtered samples provide a more representative measure of groundwater quality. This demonstration satisfies the requirements of WAC 173-340-720 in order for the Washington State Department of Ecology (Ecology) to allow filtering of groundwater compliance samples. Theory Turbidity -Turbidity occurs in monitoring wells due to the presence of silts and clays in the native soil formation that are not adequately filtered by the sand pack placed in the annulus surrounding a groundwater monitoring well. Soil-Water Partitioning -Polynuclear aromatic hydrocarbons (PAHs) are the primary constituents of concern at the Baxter Property and it is known that these compounds preferentially adhere to soil particles rather than solubilize in the water column. This affinity is incorporated into a parameter known as the organic carbon partitioning coefficient (Koc), where a high Koc indicates that a compound preferentially adheres soil particles. PAH compounds are known to have high Koc values. Contaminant Transport -In general, we can assume that soluble compounds and total dissolved solids (TDS) would be transported in groundwater in accordance with standard contaminant transport theory (contaminant flux equals groundwater flux divided by the contaminant retardation coefficient). Total suspended solids (TSS) are not transported in accordance with standard contaminant transport theory, are present in wells due to turbidity from local soil rather that groundwater transport, and TSS artificially elevate constituent concentrations in groundwater due to the contaminants affinity for soil particles. TDS are considered to be particles smaller that 10·3 um (Wastewater Engineering, Metcalfe & Eddy, 2"d Edition), therefore, using a 0.45um filter we are only removing the TSS and providing a sample that is more representative of groundwater constituents that will be transported between the compliance well and the surface water body. Evidence of this theory can be demonstrated through: l) side-by-side comparisons of filtered versus unfiltered samples where it is demonstrated that TSS are artificially increasing 5/[6/2002 Page 2 .RETEC groundwater sample concentrations; and 2) documentation of solubility exceedances in unfiltered groundwater samples that demonstrate TSS must be contributing to elevated concentrations in groundwater samples. When both these pieces of evidence are present at a site, the Weight of evidence suggests that field filtering is necessary to generate representative groundwater samples. Baxter Site Conditions Turbidity in Monitoring Wells -Unfiltered groundwater samples from the Baxter South·Property were previously collected and analyzed for TSS (by EPA Method 160.2). These samples were collected from wells that will be used as compliance wells or that are in the vicinity of compliance wells. TSS measurements ranged from 1.8 mg/L to 58 mg/L indicating the presence of turbidity in shoreline compliance wells (MW6, SA, and 8B -See Table 1). South Baxter Compliance Monitoring Data -Unfiltered versus filtered groundwater sample data are available for three shoreline compliance wells (BAX-6, SA, and SB -See Table 1). The sample events were separated by 16 months but an additional data point from 1990 indicates that the unfiltered ·concentrations have been relatively stable over time. Since these wells are shoreline compliance wells, the concentrations were low and only BAX-6 had detected concentrations. These data indicate that filtering of samples reduces the PAH concentrations by filtering out the TSS using a 0.45um filter. The unfiltered sample concentrations ranged from 4.6 to 8 times greater than the filtered sample concentrations when comparing the 1998 to 2000 data and from 1.8 to 9.8 times greater when comparing 1990 to 2000 data. Treatability Study Data -Side-by-side filtered versus unfiltered data is also available from the treatability study (RETEC, 1997) perfonned for the neighboring Quendall Terminals property. The purpose of these data (See Table 3-2 attached) was to evaluate leaching of BTEX and PAHs from a nearshore disposal facility for dredged sediment. These data indicate that PAH groundwater concentrations were reduced by filtering out the TSS using a 0.45um filter. These data also illustrate that losses of volatile constituents (BTEX) do not occur during filtering, therefore, we would expect that virtually all losses of semi-volatile PAHs during filtering occurs due to the adherence of constituents to TSS. Exceedances of Contaminant Solubility -The Baxter groundwater database was queried for contaminant data from unfiltered samples where a constituent concentrations exceeded the solubility limit. These data indicate that solids were causing elevated constituent concentrations since dissolved groundwater concentrations cannot exceed the theoretical solubility limit, particularly where a mixture of contaminants is present such that actual solubility would likely be well below the theoretical solubility. Table 2 presents 46 instances where a constituent concentration exceeded its' theoretical solubility limit. 5/16/2002 Page 3 Conclusions ~~RETEC The presence of TSS in samples from groundwater monitoring wells results in analytical data that are not representative of constituent concentrations that will be transported in groundwater. TSS is present in shoreline groundwater compliance wells at the Baxter site. Groundwater analytical data from shoreline compliance wells at the Baxter site indicate that the presence of TSS creates artificially elevated constituent concentrations in groundwater. Analytical data from the Quendall. Terminals treatability study indicate that these losses are not the result of volatilization and must be due to the filtering of TSS. Several measurements of constituent concentrations in excess of solubility limits from unfiltered groundwater samples on the Baxter Property also indicate that TSS create a1tificially elevated groundwater concentrations. Field filtering of groundwater samples using a 0.45um filter, as specified in the Cleanup Action Plan (RETEC, 2000) for the Baxter site, will provide the most representative measurement of constituent concentrations in groundwater at shoreline groundwater compliance monitoring wells. Table 1 Comparison of Filtered versus Unfiltered Groundwater Samples J.H. Baxter South Property-Renton, WA Well ID BAX·6 BAX-BA Date Sampled 3/12/1990 1 0/20/1998 2/17/2000 10/20/1998 2/17/2000 Low Flow, Low Flow, Bailer, No Low Flow. Field Low Flow. Field Sampling Method Filtering No Filtering Filtered No Filtering Filtered EPA Method 8270 8270 8270-SIM 8270 8270-SIM Reporting Limit 1 ug/L 1 ug/L 0.1 ug/L 1 ug/L 0.1 ug/L Results (ug/L) Naphthalene 440 240 45 ND ND 2-Methylnaphthalene 13 13 2.8 ND ND Acenaphthene 6.9 17 S.8 ND ND Dibenzofuran 0.4 1.6 0.2 ND ND Fluorene 0.6 1.7 0.29 ND ND Anthracene ND ND 0.11 ND ND EPA Method 160.2 160.2 Reporting Limit .1.1 mg/L 1.1 mg/L Results (mg/L) Total Suspended Solids 1.8 NA 58 NA Filtered.xis Page 1 of 1 BAX-SB 10/20/1998 2/17/2000 Low Flow, Low Flow, Field No Filtering Filtered 8270 8270-SIM 1 ug/L 0.1 ug/L ND ND ND ND ND ND ND ND ND ND ND ND 160.2 1.1 mg/L 6.1 NA 5/16/2002 Table2 Exceedances of Solubility In Groundwater Samples J. H. Baxter Property -Renton, WA Location Sample ID Sample Date Method Analyte BAX-1 BAX· 1-08/86 08/01/86 EPA8270 Anthracene BAX -1-08186 08101/86 EPA8270 Benzo(a)anthracene BAX-1-01/11/89 01/11/89 EPA8270 Benzo a)anthracene BAX -1-08/86 08/01/86 EPA8270 Benzo alPvrene BAX-1-01/11/89 01/11/89 EPA8270 Benzo alPvrene BAX-1-03/11/90 03/11/90 EPA8270 Benzo a1Pvrene BAX -1-08/86 08/01/86 EPA8270 Benzo b)fluoranthene BAX· 1-01/11/89 01/11 /89 EPA8270 Benzo b,k fluoranthene BAX-1-11/19/89 11/19/89 EPA8270 Benzo b,k fluoranthene BAX-1-03/11/90 03/11/90 EPA8270 Benzo b,k fluoranthene BAX -1 ·08/86 08/01/86 EPA8270 Benzo nhi oorvlene BAX-1-11/19/89 11/19189 EPA8270 Benzo nhi Porvlene BAX-1-08/86 08/01/86 EPA8270 Benzo k)fluoranthene BAX-1-08/86 08/01/86 EPA8270 Chrysene BAX-1-01/11/89 01/11/89 EPA8270 Chrvsene BAX-1-06/11/89 06/11/89 EPA8270 Chrvsene BAX-1-11/19/89 11/19/89 EPA8270 Chrvsene BAX -1-03/11 /90 03/11/90 EPA8270 Chrvsene BAX-1-08/86 08/01/86 EPA8270 Dibenz a,h)anthracene BAX-1-01/11 /89 01 /11/89 EPA8270 Dibenz(a,h anthracene BAX-1-01/11/89 01/11/89 EPA8270 Dibenzofuran BAX -1-06/11 /89 06111189 EPA8270 Dibenzofuran BAX -1-08/86 08/01/86 EPA8270 Fl uoranthene BAX-1-08/86 08/01/86 EPA8270 lndeno(l ,2,3-cdrnvrene BAX-1-01/11/89 01/11/89 EPA8270 lndeno(1,2,3-cdlovrene BAX-1-08186 08/01/86 EPA8270 Phenanthrene BAX-1-08186 08/01/86 EPA8270 PYrene BAX-1-01/11/89 01/11/89 EPA8270 Pvrene BAX-1A BAX-1A-01/11/89 01/11/89 EPA8270 Benzofb,klfluoranthene BAX-1A-01111/89 01/11/89 EPA8270 Dibenzofuran BAX-2 BAX -2-08/86 08/01186 EPA8270 BenzofohilooNlene BAX-6 BAX-6-1098 10/20/98 SW8270 Dibenzofuran BAX-SA BAX-SA-01/11/89 01/11/89 EPA8270 Chrvsena BAX-9 BAX -9-01 /11 /89 01/11/89 EPA8270 Acenaphthvlene BAX ·9-01 /17 /96 01/17/96 EPA8270 Acena ihlhvlene BAX-9-01 /11 /89 01/11/89 EPA8270 Benzo a1Pvrene BAX-9-01/11/89 01/11/89 EPA8270 Benzo b,klfluoranthene BAX-9-01/11/89 01/11/89 EPA8270 Chrvsene BAX-9-01/11/89 01/11/89 EPA8270 Dibenzofuran BAX-10 BAX-10-01/11/89 01/11/89 EPA8270 Dibenzofuran BAX-10-06/01 /89 06/01/89 EPA8270 Dibenzofuran BAX-10-03/12/90 03/12/90 EPA8270 Dibenzofuran BAX-14 BAX-14-09/19/90 09/19/90 EPA8270 Benzo a)anthracene BAX-14-09119/90 09/19/90 EPA8270 Benzofb,k\fluoranthene BAX-14-09/19/90 09/19/90 EPA8270 Chrysene BAX-14-09/19/90 09/19/90 EPA8270 Dibenzofuran BaxSolExceed.xls Page 1 of 1 Result Qualifier Units 822 J ua/L 542 J UQ/L 47. ua/L 388 J uQIL 23 ua/L 2 ua/L 230 J uq/L 46 uq/L 3 uo/L 3 ua/L 132 J ua/L 0.8 J ua/L 256 J UCl/L 580 J uq/L 45 ua/L 2 uo/L 2.5 ua/L 5 ua/L 66 J ua/L 3 uq/L 23 uq/L 3 UQ/L 1824 J ua/L 158 J ua/L 8 ua/L 3258 J uq/L 1300 J uq/L 140 uq/L 2 ua/L 2 UCl/L 2 J ua/L 1.6 ua/L 2 ua/L 3 ua/L 8.6 uotl 4 ua/L 6 ua/L 4 ua/L 3 ua/L 5 Ull/L 2 ua/L 2 uo/L 14 ua/L 7.3 J UCJ/L 11 ua/L 130 ug/L 5/15/2002 Report far Tro,ttrblllry Testln1 · >ilmmt, and Groundwater • ,1 ~•~:a Table 3-2 Results for the Impacted Sediment Leachate Test Analyte Equilibrium Sediment Unfiltered Leachate Filtered !,.eachate Unfiltered Kd Unfiltered Koc FIitered Kd Filtered Koc Concentration Concentration Concentration (L/kg) (Ukg TOC) (Ukg) (Ukg TOC) (mg/kg) (mg/L) (mg/L) EPA Mlthod 8020 Benzene 3.2 1.45 1.5 2.21 64 2.13 62 Toluene 0.415 0.1 0.08 4.15 120 5.19 150 Ethylbenzene 9.65 1.15 1.045 8.39 243 9.23 268 m,p-Xylene 4.15 0.475 0.435 8.74 253 9.54 277 o-Xylene J.2 0.145 0.14 8.28 240 8.57 248 Total BTEX 18.62 3.32 3.20 NC NC NC NC EPA Mlllu,J 8270 Naphthalene 56.5 7.35 2.6 7.7 223 22 630 2-Mcthylnaphthalene 8.35 0.285 0.064 29 849 130 3,782 hcnaphthylene 0.255 < 0.001 < 0.001 255 > 7,391 > 255 > 7,391 Acenapht.hene 2.8 0.064 0.015 44 1,268 187 5,411 Dibenzofuran 0.45 0.008 < 0.001 56 1,630 > 450 > 13,043 Fluorene 0.665 O.ol < 0.001 67 1.928 > 665 > 19,275 Phenanthrene 1.7 0.012 < 0.001 142 4,106 > 1700 > 49,275 Anthracene 0.585 0.003 < 0.001 195 5,652 > 585 > 16,957 Fluonnthene 2.3 0.01 <, 0:001 230 6,667 > 2300 > 66,667 Pyrone 3.15 0.012 < 0.001 263 7,609 > 3150 > 91,304 Benz(a)anthncene 4.45 o.oi < 0.001 445 12,899 > 4450 > 128,986 Chryoene 10.2 0.016 < 0.001 638 18,478 > 10200 > 295,652 Benzo(b )fluoranthene 12 0.025 < 0.001 480 13,913 > 12000 > 347,826 Benzo(k)fluoranthene 7.4 0.018 < 0.001 411 11,916 > 7400 > 214,493 Benzo(a)pyrene 11.5 0.025 < 0.001 460 13,333 > 11500 > 333,333 lndeno(l,2,3-cd) pyrene 5.65 0.009 < 0.001 628 18,196 > 5650 .> 163,768 Dibenz(a.h)anthracene 2.55 0.003 < 0.001 850 24,638 > 2550 > 73,913 Benzo(g.h,i)perylene 7.1 0.012 < 0.001 592 · 17,150 > 7100 > 205.797 Total PAH 137.61 7.87 2.69 NC NC NC NC . NOTES, NC -Not CakuJ..ted IA,d,at. Tutmg Appendix F Stormwater Technical Information STOR.MWATER TECHNICAL INFORMATION , Seahawks Headquarters and Training Facility ', .•· Renton, Washington . 4,2006 I • MAGNUSSON KLEMENCIC ASSOCIATES STORMWATER TECHNICAL INFORMATION Seahawks Headquarters and Training Facility Renton, Washington I.EXPIRES 101!)/dl, i --· August 24, 2006 I • MAGNUSSON KLEMENCIC ASSOCIATES . $-inmurol + CwiI EnginNf'fl 1301 Fifth AvellUe, Sv1i. 3100 Seottl•, IM:ithiflglofl 98101-2699 T: 206 292 1200 F: 206 2921201 MAGNUSSON KLEMENCIC AS:SXIAHS STORMWAUR TECHNICAi INEQRMAJION~···-------------- Section I, Proje<I Overview ..... Se,lion II, Preliminory Conditions Summary ..... . Section Ill, Ollsile Analysis. ....... . Section IV, flow Control ond Water Quality Fo,ility Analysis ond Design .. Section V, Conveyance System Analysis ond Design ....................... . Section VI, Special Reporls and Sludies ............ . l 3 5 7 9 9 Section VII, Olher Permits............... 1 0 Section VIII, Conslruction Stormwoter Pollution Prevention Pion Analysis and Design... l 0 Section IX, Bond Quantifies Worksheet, Retention/Detention Facility Summary Sheet, and Declaration of Covenant............. l 1 Sertion X, Operations and Moinlenonce Manual .. ... . . . . . l 1 References 1 2 lliillR"'E_,,S _____ ~ _____ _ Figure 1-1, Technical Information Reporl Worksheet Figure 1-2, · Site Location Figure 1-3, Figure 1-4, Figure 11-1, Droinage Basins, Subbasins, and Site Choroclerislics Sa i Is 2-year, 24-hour Precipitation Figure 11-2, 25-year, 24-hour Precipitation figure 11-3, 100-year, 24-hour Precipitolion Figure 111-1, Ollsile Flow Conveyance Figure 111-2, Gypsy Subbosin Figure IV-1, Water Quality Treolmenl Areas Figure V-1, Conveyance System Overview figure Vll-1, Temporary Erosion and Sedimentolion Conlrol Plans APPENDIC..._,, ______ ~----------------·-----~ Appendix A, Sand filler Sizing Appendix B, Onsile Conveyance Colculations Appendix L Oflsile Conveyance (Gypsy Subbosin) Colculolions Stormwater Technical Information Table of Contents Seahawks Headquarters and Training Facility, Renton, Washington I i STORMWATER TECHNICAL INFORMATION I --.--· MAGNUSSON KLEMENCIC ASSOCIATES SECTION I· PROIECT OVERVIEW INTRODUCTION MAGNUSSON KLEMENCIC ASSOCIA~fS This report documents the stormwater and drainage design approach and proposal for the Seo hawks Headquarters and Training Facility project. The report hos been prepared concurrently with the Shoreline Substantial Development Permit Submittal using the guidelines for the Stormwater Technical Information Report (TIR) from the 2005 King County Surface Water Design Manual (KCSWDM). Figure 1-1 consists of the standard TIR worksheet, completed for the project. The project is located between Lake Washington and Ripley Lane, northwest of the Northeast 44th Street and Interstate 405 interchange in Renton, Washington (see Figure 1-2). The east side of the site abuts the Burlington Northern and Santo Fe Railroad right-of-way. The site is located in the Gypsy Subbasin. The proposed project includes construction of a new headquarters and sports training facility on a vacated brown-field industrial site. EXISTING DRAINAGE The existing site is currently vacant land with weedy brush cover. The existing site runoff sheet flows from east to west, toward Lake Washington. There is an existing degraded storm drain crossing the site that conveys of/site stormwater from the Gypsy Subbasin, from the east side of the site to Lake Washington. A created mitigation wetland exists at the southwestern corner of the site. The wetland is predominantly a lake-fed wetland. PROPOSED DRAINAGE The project stormwater management approach is based on the 2005 KCSWDM. Enhanced water quality treatment is proposed for site stormwater runoff. As with the existing site conditions, all droinage from the site will discharge directly to Lake Washington, a direct discharge receiving waler. No flow control is proposed or required. Several stormwoter management treatments are proposed to serve different developed zones of the site. The treatment areas and systems ore as follows: Synthetic Turf field, Pedestrian Hardscape, and Building/Roof Area, These areas are non-pollution-generating surfaces. Stormwater runoff from the synthetic turf field, pedestrian hardscape, and building roofs will drain to Lake Washington as direct discharge. Precipitation that lands on the field will drain vertically through sand and gravel to subdrains that will convey the stormwater to a site storm drain system discharging to Lake Washington. Natural Turi field(s) Similar to the synthetic turf field, precipitation that lands on the natural turf fields will drain vertically through sand to subdrains. The natural turf fields, with an 18-inch layer of sand, will function as a very large sand filter. An Integrated Pest Management (1PM) Plan will be prepared that describes turf management practices for these practice fields. One-hundred percent of the storm runoff from these fields will poss through the underlying sand, which exceeds the requirements for large sand filter treatment. Stormwater Technical Information Seahawks Headquarters and Training Facility, Renton, Washington Mitigated Constructed Wetland MAGNUSSON KLEMENCIC ASSOCI.\HS The Baxter Cove Mitigation Wetland is located on the Lake Washington shoreline at the southwest corner of the site and is hydraulically connected to the lake. The site drainage is collected, conveyed, and managed in onsite drainage systems that are not hydraulically connected to the wetland. Paved Parking and Driveways Stormwater runoff from paved parking and driveway areas will be collected and/or directed to four large sand filters. Three of the sand filters will be covered with grass, which will intercept fines and provide pre-treatment and also is expected to help maintain the surface permeability of the filter; pretreatment in the fourth sand filter will be provided by on additional layer of sand. The extra layer of sand will be used for football practice activities. As a result, the lop layer of sand will be maintained by removing pollutants on an annual basis (and sometimes more than once per year) to ensure the health and safety of the team's players. The large sand filters have been sized per the 2005 KCSWDM. Subdrains from the large sand filler will convey waler lo the site drainage system. Discharge to Lake Washington Stormwaler from the site will be collected and discharged to Lake Washington. Discharge will occur through five new constructed drainage system outfalls. The new pipe outfalls will release water above the ordinary high-waler mark (OHWM) of Lake Washington and will drain over rock-lined channels to the OHWM of Lake Washington. Outlets of rock-lined channels constructed lo provide energy dissipation and protection against erosion have been located at areas where existing shoreline materials are non- erasive, to prevent impacts when the Army Corps lowers the lake's waler level below the OHWM. Gypsy Subbosin Conveyance Relocation and Upgrade Improvements also will be made to relocote and increase the capacity of the existing storm drain that conveys the offsite flow from the Gypsy Subbasin. The relocation is required because the proposed building will be located over the existing pipe. Earlier studies by the City of Renton determined that increased capacity is required to convey the current and future flows from the Gypsy Subbosin. LIST OF FIGURES • Figure 1-1: TIR Worksheet • Figure 1-2: Site Location • Figure 1-3: Drainage Basins, Subbosins, and Site Characteristics • Figure 1-4: Sails Stormwater Technical Information Seahawks Headquarters and Training Facility, Renton, Washington SECTION II· PRELJMINARY CONDITIONS SUMMARY SITE CONDITIONS MAGNUSSON KLEMENCIC ASSOCIMES The proiect will create approximately 8.3 acres of sports fields, 3.3 acres of building(s), and 3.7 acres of new vehicular impervious surface. The total project area will be slightly under 20 acres. SOILS Figure 1-4 shows the soils map for the area that was prepared by the Soil Conservation Service (SCS) in the 1970s. The SCS hydrologic soil group designation has little relevance for the proiect, however. Past site activities generated large amounts of organic materials (bark and mulch) that worked into the native soils. Fill also likely was placed over native soils lo facilitate the operations al the site. Most significantly, because of the impacts of past operations on the site soils, the Washington Deportment of Ecology (Ecology) hos established a Consent Decree that mandates the placement of fill to "cop" the in- situ soils; the runoff potential of the developed site will depend on the characteristics of the "cap" material rather than the native soil. For the purposes of the drainage analysis, all of the soils were treated as belonging to Hydro logic Soil Group C, moderate runoff soils (till). RAINFALL Design storms for the project location ore shown in Tobie 11-1 and Figures 11-l to 11-3. CORE REQUIREMENTS Tobie 11-1: 24-hour Precipitation ot Seohowks Heodquorters and Training Focility Storm Recurrence 6-month Rainloll (inches) 1.27 ·----·----------. - 2-year l 0-yeor 25-yeor 100-yeor 1.99 2.90 3.43 3.89 A pre-application meeting was attended by the Owners, Design Team, and City staff on May 3, 2006, and conditions for the proiecl were identified. A subsequent meeting was held on July 19, 2006, at which time ii was determined that Ecology would be the permitting agency for most of the site work and that the design would need to conform to City standards. The drainage manual officially adopted by Stormwater Technical Information Seahawks Headquarters and Training Facility, Renton, Washington MAGNUSSON KLEMENCIC ASSOCIAH5 the City of Renton is the 1990 KCSWDM; however, for this project the stormwoler management and drainage design will meet the 2005 KCSWDM criteria lo the extent practicable. Core Requirement l: Di1<horge ot the Natural location The drainage from the improved areas will continue to drain to Ldke Washington. New pipe· outlets/outfalls will be located above the OHWM. The receiving body for this system will not be changed. The onsite flows will be kept separate from the offsite Gypsy Subbosin flows. The proposed Gypsy Subbosin pipeline relocation maintains the final segment of existing 24-inch corrugated metal pipe that outfalls to the lake. Core Requirement 2: Offsite Analysis An offsite analysis was conducted for the Gypsy Subbosin drainage that crosses the site. Core Requirement 3: Flow Control Peak rote runoff control is not required or provided for the project because the site discharges directly to Lake Washington, a major receiving water body. Core Requirement 4: Conveyance System New conveyances have been designed to accommodate the 25-yeor design storm. The conveyance pipe for the offsite Gypsy Subbasin flow has been sized for the l 00-year design storm for future basin conditions. Core Requirement 5: Temporary Erosion and Sedimentation Control A Temporary Erosion and Sedimentation Control (TESC) plan has been prepared for the project and is included in this report as Figure VIII-l. Core Requirement 6: Maintenance and Operation Maintenance and operation requirements will be identified when the stormwater management and storm drain system design has been completed and permitted. This information will be added to this report as an addendum. SPECIAL REQUIREMENTS Special Requirement l: Other Adopted Area-specific Requirements The Sea hawks headquarters and training facility include the North Baxter Property and the South Baxter Property, which are covered under Ecology Consent Decrees #00-2-11778-?KNT and #00-2-11 779- SKNT, respectively. The Consent Decrees require that the conditions of the Cleanup Action Plan approved in 2000 be applied to the site. The Cleanup Action Plan for this site does not have specific requirements for the permanent stormwater controls for the site, but addresses management of existing site soiis during construction. The plan requires that existing soils be capped to prevent incidental contact upon completion of the project. The capping materials include pavements, building foundation pads, the Stormwater Technical Information Seohowks Headquarters and Training Facility, Renton, Washington MAGNUSSON KLEMENCIC 1.,isoc1AH~ athletic field section, and imported fill. Where the copping materials are pervious, a warning barrier will be buried (for example, a geog rid buried 3-feet beneath the pervious ground surface. The special requirements for the project's construction hove been implemented in the grading plans and TESC plan. Special Requirement 2: Flood Hazard Area Delineation Does not apply. Special Requirement 3: Flood Protection Facilities Does not apply. Special Requirement 4: Source Controls Source control requirements will be identified when the s!ormwater management and storm drain system design has been completed and permitted. This infomnation will be added to this report as on addendum. Speciol Requirement 5: Oil Control Does not apply; project is not a high-use site. LIST OF FIGURES • Figure II-1: 2-year, 24-hour Precipitation • Figure 11-2: 25-yeor, 24-hour Precipitation • Figure 11-3: 1 DO-year, 24-hour Precipitation SECTION Ill· OFFSJTE ANALYSIS A down-stream analysis is not required for this project because the site is adjacent to Lake Washington and improvements on site will not impact downstream drainage conditions. A review of ollsite, upstream conditions was conducted for the Gypsy Subbasin. The Seahowks Training Facility will be constructed near the final, piped segment of the Gypsy Subbosin. Because of historic flooding within the Gypsy Subbosin area (the flooding occurred on the east side of 1-405), the City of Renton retained a consultant to conduct engineering studies in the 1990s lo study and prepare engineering design concepts to reduce the flooding potential. Hydrologic/hydroulic simulations estimated peak flow roles within the Gypsy Subbasin and included preliminary engineering conceptual designs for capital improvements to reduce flooding occurrences. Investigations showed that some flooding relief could be attained by increasing the hydraulic capacity of the piped Gypsy Subbasin in the area between the Burlington Northern Railroad and the Lake Washington outfall. The existing and proposed Gypsy Sub basin drainage at the site is shown in Figure 111-1. The extent of the Gypsy Subbasin is shown in Figure 111-2. Stormwater Technical Information Seahawks Headquarters and Training Facility, Renton, Washington MAGNUSSON KLEMENCIC ASSOCIATES The offsite analysis for the Sea hawks project considered ii the 1997 analyses of the Gypsy Subbasin adequately reflect the current and projected future basin conditions and assess whether the earlier engineering alternatives appear valid with today's understanding of the basin conditions. Four points are considered: the modeling method; the modeled future land use; the basin extents; and the assumptions about implementation of stormwater detention as the basin develops. MODELING METHOD Earlier analyses used the Santa Barbara Urban Hydrograph (SBUH) method with the projected future build-out conditions to compute flow rates associated with the typical design storm recurrence intervals. While there have been advances in hydrologic modeling, the SBUH method is still valid for estimating peak runoff rates from basins of this size and relative imperviousness/development (the known shortcomings of the SBUH model ore primarily related to long-duration storms and to modeling runoff from forests, neither of which are vital to the Gypsy Subbosin flow analyses). The design flow from the SBUH analysis of the l 00-yeor, 24-hour storm is 162 cubic feet per second (ds), which does not include flow from the expanded 1-405 tributary area, discussed below. FUTURE LAND USE The land use modeled in 1995/1997 was based on Renton and King County zoning maps. MKA hos com pored the modeled future land use to the current City of Renton and City of Newcastle Zoning mops and hos determined that all of the current zoning densities are less than or equal to the densities used in the 1997 analysis; there is no need to update the assumed future land uses considered in the 1995/1997 analysis. BASIN EXTENTS The basin extents are projected to expand because of the Washington State Department of T ransportotion (WSDOT) plan to widen 1-405, which will create new lanes and shoulders from which drainage will be collected and conveyed to the NE 44th Street interchange for water quality treatment and release to Lake Washington. The 1997 Gypsy Subbasin study estimated that 1-405 improvements would increase the basin extent by 75 acres to a total of approximately 94 acres, increasing the l 00-yeor flow in the system by approximately 9 ds. The study also noted that ii WSDOT released water into the Gypsy Subbasin conveyance system, then the City of Renton flow control standards would apply. Based on MKA's cursory review of the 2006 Environmental Assessment for the project, WSDOT is planning a new storm drainage collection system and conveyance tnunkline to collect, treat, and convey freeway runoff to the lake, aligned across the property to the south of the site. Considering the extent of the planned improvements, and assuming that WSDOT's hydraulic design will comply with the WSDOT Highway Runoff Manual and Hydraulic Design Manual requirements, we believe that the previously computed 9 els allowance for WSDOT's l 00-year runoff is reasonable. STORMWATER DETENTION The earlier study assumed that 85% of new commercial development and 50% of forest-to-residential conversions would provide new starmwater flow control facilities sized to maintain predeveloped runoff rates, the level of control established by the current King County storrnwater management code. These assumptions appear reasonable and may even be conservative considering that l 00% of new commercial development will likely have to follow the drainage code and that changes in thresholds that Stormwater Technical Information Seahawks Headquarters and Training Facility, Renton, Washington I ---. MAGNUSSON KLEMENCIC ASSOCIATES trigger flow control requirements will likely ensure that at least 50% of forest-to-residential conversions will apply flow control practices. CONCLUSION Based on these specific hydrological elements (model method, future land use, basin extents, ·and detention assumptions), which hove not changed significantly between 1995/1997 and the present, it appears that re-computing the basin hydro logic conditions would not yield substantially different results than what was obtained in the previous studies. · The estimated l 00-year, 24-hour flow rote for the offsite flow entering the Seohowks Training Facility site from the Gypsy Subbasin is 171 els. The design of the relocated Gypsy Subbasin storm drain pipeline is discussed in Section V. LIST OF FIGURES • Figure 111-1: Offsite Flow Conveyance • Figure 111-2: Gypsy Subbasin SECTION IV: FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN Peak role runoff control is not required or provided for the project because the site discharges directly to Lake Washington, a major receiving water body. Therefore, retention/detention analysis and design is not included in this report. WATER QUALITY TREATMENT The 2005 KCSWDM designates areas draining lo Lake Washington as subject to the requirements of "Basic Treatment.' Because the Sea hawks desire to demonstrate environmental stewardship, this project is sizing the waler quality treatment facilities in accordance with the 'Enhanced Basic" waler quality menu of the manual. The Enhanced Basic water quality criteria requires treatment of 95% of the total runoff from the site lo achieve 50% total zinc removal and achieve greater than 80% total suspended solids removal. Using the large sand filters that are proposed will also achieve compliance with the "Sensitive Lake Protection" water quality menu because large sand filters are expected lo provide at least 50% reduction in total phosphorus from the site's runoff. The water quality treatment for the site falls into three categories (Figure IV-1 ): • Stormwater runoff from the natural turf fields will be collected through a subdroinage system. The depth of the sand substrate in the field ( 18 inches) effectively provides treatment for the stormwaler generated from the field, and no further treatment is proposed. Stormwater Technical Information Sea hawks Headquarters and Training Facility, Renton, Washington I --.~- MAGNUSSON KLEMENCIC ASSOCIATES • Stormwater runoff from the roof areas, sidewalk and plaza areas, synthetic turf fields, non-field landscaped areas on the south and west sides of the site will be collected and conveyed to the lake. The roof designs do not incorporate unpainted metal, so no treatment of roof runoff is proposed. • Stormwater runoff from the vehicular impervious surfaces will be collected and treated in Large Sand Filters sized in accordance with the 2005 KCSWDM. Sand Filter Design The sand filter sizing computations are included in Appendix A Table IV-1 summarizes the sand filters designed for the project. A total of 6,592 square feel (sn of sand filter area will provide treatment for 3.85 acres of tributary area that is 14% impervious. The typical depth of the filter sand layer is 18 inches. Table IV-1 : Sand Filters Design Summary Tributary Tributary Filter Ponding Filter Surface Filter Area (acre) Imperviousness Filter Surface Depth (It) Area (sf) SF-1 1.49 92.0% Sand 2.0 2,195 -------------·· SF-2 1.72 80.2% Turf 1.0 2,886 SF-3 0.40 85.0% Turf 1.0 1,045 SF-4 0.24 95.8% Turf 1.0 467 Additional requirements for large sand filters are addressed below. • Pretreatment: Piped conveyances include a catch basin with a sump and tee to provide settling and spill control before runoff enters the sand filter. Turf grass established on three of the sand filter surfaces will act as a filter strip to provide pretreatment of runoff. The root structure of the turf will help prevent the sand surface from clogging. • Sand Filter 1 will be used for team training exercises (e.g., running in sand). To support this function, the depth of the sand bed will be 24 inches instead of the typical 18 inches. The surficial sand layers will be loosened or replaced once or twice annually to maintain the quality of the sand for the training exercises. This maintenance also will prevent "blinding" of the sand surface and remove fine particles that accumulate in the upper horizon of the sand filter. The proposed pretreatment regimen for Sand Filter 1 therefore consists of the intensive sand surface maintenance regime in conjunction with the spill control tee located upstream of the facility. • On-line versus off-line: Sand Filters 2, 3, and 4 will be constructed on-line, which is to say without an upstream flow splitter. Flows exceeding the design capacity of the filter will overtop a grated overflow structure and be conveyed to the storm drain system outlet. Sand Filter 1 will have on upstream bypass structure that diverts water when the sand filter poal exceeds the maximum design water surface. Stormwater Technical Information Sea hawks Headquarters and Training Facility, Renton, Washington I -.-~-- MAGNUSSON KLEMENCIC ASSOClAHS • Spill control: A spill control tee will be provided within the storm drain system for upstream of Sand Filter l. • Flow spreading: Flow spreaders are provided ot each filter to disperse stormwater across the filter surface, and where site surface runoff is not collected, the site will be graded so that the cunoff enters the filter as dispersed sheet flow. • Overflow: In addition to a primary overflow strudure consisting of o grated catch basin riser, the sand filters proximate to Lake Washington use a rock-stabilized emergency overflow. The sand filters proximate to the athletic fields are graded so that overflow will enter the athletic fields and eventually be collected and discharged through the field drainage system. LIST OF FIGURES Figure IV-1: Water Quality Treatment Areas Sf.CTION Y· CONVEYANCE SYSTEM ANALYSIS AND DESIGN There ore in essence four differenct stormwater collection/conveyance systems on the project site: the Gypsy Subbosin offsite "bypass" pipeline, the parking lot and driveway storm drainage system, the roof drain/landscape/pedestrian drainage system, and the field drainage system (Figure V-1 ). The onsite drainage system sizing is documented in Appendix B. Hydrologic analyses have been conducted for the conveyance and water quality treatment sizing and design. The basins used in these analyses are shown in Figure 1-3 and the maior storm drains are shown in Figure V-1. The Rational Method was used in sizing pipes that convey surface cunoff. The 25-year rainfall intensity used for the design is 2.7 inches per hour. The offsite Gypsy Subbasin bypass pipe sizing computations are provided in Appendix C. The design flow for this system is l 7l els, which is provided by the proposed design, with the future outfall by others. Analyses showed that the existing system con convey approximately 13 els before overtopping the existing railroad ditch. The proposed design, which uses the existing 24-inch corrugated metal pipe to outfall, has capacity for 30 els. LIST OF FIGURES Figure V-1: Conveyance System Overview SECTION YI· SPECIAL REPORTS AND STUDIES The Gypsy Subbasin analyses from 1995 and 1997 were reviewed and considered in the preparation of the proposed drainage design. Stormwater Technical Information Seahawks Headquarters and Training Facility, Renton, Washington I ---•.... MAGNUSSON KLEMENCIC ASSOCIATES The WSDOT Environmental Assessment for the 1-405 Renton-to-Bellevue Proiect was cursorily reviewed to assess WSDOT's intended stormwoter management plans for the upcoming highway widening that drains in-port to the Gypsy Subbasin. See Section II, Special Requirement 1, for discussion about the Ecology Consent Decree and Cleanup Action Plan requirements for the site. · SECTION YII· OTHER PERMITS The following permits/approvals also apply to this proiect: • Hydraulic Proiect Approval • Ecology Consent Decree Compliance Approval SECTION VIII: CONSTRUCTION STORMWATER POLLUTION PREVENTION Pl AN ANALYSIS AND DESIGN A TESC pion has been prepared for the proiect and is included in this report as Figure VIII-1. The plan will meet the minimum TESC requirements as discussed below. TESC REQUIREMENTS TES( Requirement 1: Clearing Limits Clearing limits will be shown on the plans. TES( Requirement 2: Cover Measures Cover measures will be addressed in the TESC Pion Notes. TES( Requirement 3: Perimeter Protection A sediment retention barrier will be shown on the plans. TESC Requirement 4: Traffic Area Stabilizolion The stabilized construction entrance will be shown on the plans. The TESC Plan Notes will indicate that Stole water quality standards are applicable lo construction site runoff. TES( Requirement 5: Sediment Retention A sediment retention system will be shown on the plans. TES( Requirement 6: Surface Water Control Interceptor swoles will be shown on the plans. Stormwater Technical Information Seahowks Headquarters and Training Facility, Renton, Washington I ----- TES( Requirement 7, Dust Control Air quality will be addressed in the TESC Plan Notes. TES( Requirement 8, Wet Season Construction Wet season construction will be addressed in the TESC Plan Notes. TES( Requirement 9, Construction within Sensitive Areas and Buffers MAGNUSSON KLEMENCIC ASSOCIATES Construction within sensitive areas and buffers will be shown on the plans and addressed in the TESC Pion Notes. TES( Requirement 10: Maintenance Maintenance will be addressed in the TESC Plan Notes. TES( Requirement 11: Final Stabilization Final stabilization will be in accordance with the landscape plans for the project. LIST OF FIGURES Figure VIII-l : TESC Plans SECTION IX: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND DECLARATION OF COVENANT None. SECTION X· OPERATIONS AND MAINTENANCE MANUAL OPERATIONS The project provides stormwater treatment facilities to treat runoff from the new vehicular impe,vious surfaces. The stormwoter will be treated primarily by settling and/or filtering suspended pollutants from the runoff. The operation of the treatment facilities will be passive and controlled by gravity. There are no actions required on the port of the Owner aside from maintaining the facilities. MAINTENANCE The slormwoter treatment facilities will require periodic inspection and cleaning lo function properly. At a minimum, the facilities should be inspected each year. When the depth of sediment accumulated in the bottom of conventional facilities exceeds 6 inches, the facilities should be cleaned by removing the Stormwoter Technical Information Seohawks Headquarters and Training Facility, Renton, Washington MAGNUSSON KLEMENCIC ASSOCIATES accumulated sediment. Natural systems should be scarified and replenished on an annual basis to ensure proper function. Catch basins and manholes also require periodic cleaning. This typically consists of using a vactor truck to remove accumulated sediments. Drainage structures should be cleaned when sediment accumulation reaches within 12 inches of the outlet pipe invert or when pollutants are observed. FIELD TURF MANAGEMENT A landscape management and 1PM pion will be prepared for the athletic fields. This plan will address the use of fertilizers, pesticides, and herbicides and will identify the procedures to be used when applying and handling these substances so the quality of runoff from the field subsurface drainage system meets applicable wafer quality standards. REFER Surface Water Design Manual, King County Surface Water Management, 2005. Pre-Application Meeting with City of Renton Staff, May 3, 2006. Pre-Application Meeting with Washington State Department of Ecology and City of Renton Staff, July l 9, 2006. Port Quendall Company, Feasibility Study and Cleanup Action Plan: J.H. Baxter North Property, April 5, 2000. City of Newcastle, Comprehensive Plan, Figure LU-5 Zoning Map, amended July 5, 2005. City of Renton, Gypsy Subbasin Analysis Technical Memorandum No. 2, April 1995. City of Renton, Gypsy Subbasin Drainage Improvements Design Memorandum, September 1997. City of Renton, Zoning Mop, updated January l 0, 2006. Washington Department of Transportation, 1-405 Renton lo Bellevue Project Environmental Assessment, March 2006. Washington Stole Department of Ecology, Consent Decree #00-2-11 778-7KNT and #00-2-11779- SKNT. Stormwater Technical Information Sea hawks Headquarters and Training Facility, Renton, Washington FIGURES I ----.-- MAGNUSSON KLEMENCIC ASSOCIATES KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Project Owner ,:;,.,,.,.8-44._ NoF:r,./Wt%T Phone {zt,,) 34 Z -Zooo Address > c,S-r,"[fl, A"e. S., 5/e <wo 5eq#I<-w'A 'i&1"4 Project Engineer ________ _ Company M..,n!!$'•'! /tie"""'"'" A!.Uc:;. Phone li-06) 'Z'l2-/Zit> D Landuse Services Subdivlscin / Short Subd. / UPD D Building Services M/F / Commerical / SFR D Clearing and Grading D Right-of-Way Use 0 Other $~11.~ ubs+..1*( "J»,e/.,.._,.+ Technical Information Report Type of Drainage Review ~ I Targeted / (circle}: 'ti(ge Site Date (include revision </J/z '5/Zco6 dates}: Date of Final: Project Name ~9"9.,k5 Ila ~ T....,l'§ &,t/. 1 DDES Permit# ---------- Location Township 24 N Range 5' E Section 2 't Site Address ---------- 0 COE404 D DOE Dam Safety D FEMA Floodplain D COE Wetlands D Other __ _ Shoreline Management a Structural RockeryNaulV __ D ESA Section 7 Sita Improvement Plan {Engr. Plans) Type (circle one): ~ / Modified / Small Site Date (include revision f? lz :! I z oo 6 dates): Date of Final: Type (circle one): Standard / Complex / Preappllcation / Experimental/ Blanket Description: (include conditions in TIR Section 2) Date of A roval: 2005 Surface Water Design Manual Fill, :r -1 • i 1/1/05 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIA) WORKSHEET Monitoring Required: Start Date: Completion Date: Community Plan:-------------Special District Overlays: _____________________ ~- Drainage Basin: _~fz~'tµf~~~i~_Su___.,g-lM=S<~cl,-~---- Stormwater Requirements: C 1f-t .,;. ©Miro 0 jliver/Stream --------- 1:::f J.ake 1\.1.,.9,,1,..,k".J [iJ Wetlands • ey.tl, r.,,/..,., .. 1-. ...., ,.:1,e D Closed Depression -------- 0 Floodplain CD~ ,,,-e-~--,~-~--~- t1e .. q,~ PLlro 0 Steep Slope --------- 0 Erosion Hazard -------- 0 Landslide Hazard------- 0 Coal Mine Hazard ------- 0 Seismic Hazard -------- 0 Habitat Protection-------0 __________ _ Soil Type Slopes Erosion Potential n/9 (h,sl<o-,c) S? ... t}/e ,a,1.,,,)::. fl..+: ~l<.G., .(:If t,,c,I. ..,,,,,; ~"'-~le."'----- ~ ,,.,,.....,1. &-.f -k!<:.::'°-'-C'~"-''------- D High Groundwater Table (within 5 feet) D Other ________ _ 0 Additional Sheets Attached 2005 Surface Water Design Manual r-::'llr. 'j; _,' 2 0 Sole Source Aquifer 0 Seeps/Springs 1/1/05 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET R~ERENCE IZl Core 2 -Off site Analysis D Sensitive/Critical Areas D SEPA D Other LIMITATION/ SITE CONSTRAINT C9tJ re-( b'f#1 sukJ..:.s:" £t-s O __________ _ D Additional Sheets Attached Threshold Discharge Area: name or descri tion Core Requirements (all 8 apply) Dischar e at Natural location Offsite Analysis Erosion and Sediment Control Maintenance and Operation Financial Guarantees and Liabil" Water Quality (include facility summary sheet) Flood Protection Facilities Source Control (comm./industrial landuse) llcable 2005 Surface Water Design Manual __. ,-fl,, Number of Natural Dischar e Locations: ESC Site Supervisor: "T'f} D Contact Phone: Alter Hours Phone: Responsibility: riv / Public If Private Maintenance Lo R ulred: Yes / No Provided: Yes / No Type: Basic / Sens. Lake I hanced Basic / Bog or Exemption No. -----=---- Type: CDA / SDO /MOP/ BP/ LMP / Shared Fae. / Name: Type: Major / Minor / Exemption / o 100-year Base Flood Elevation (or range): _____ _ Datum: Describe: Describe landuse: Describe any structural controls: I -J • 3 1/1/05 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Oil Control High-use Site: Treatment BMP: Yes I(!};)) Maintenance Agreement: Yes I G'.5 with whom? Other Dralna= Structures Describe: MINIMUM ESC REQUIREMENTS .J DURING CONSTRUCTION S Clearing Limits L!::I. Cover Measures Perimeter Protection Traffic Area Stabilization t:.lfaediment Retention G! .Surface Water Control ust Control onstruction Se uence Flow Control D Detention D Infiltration D Regional Facility D Shared Facility D Small Site BMPs D Other 2005 Swface Water Design Manual r::'11,.} ·l,4 MINIMUM ESC REQUIREMENTS _/ AFTER CONSTRUCTION lA.,stabilize Exposed Surfaces (] Remove and Restore Temporary ESC Facilities ~ ean and Remove All Silt and Debris Ensure eration of Permanent Facillties Flag Limits of SAO and open space preservation areas D Other --------- Water Qualit D Biofiltration D Wetpool i Media Filtration D Oil Control D Spill Control D Small Site BMPs D Other 1/1/05 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Drainage Easement D Access Easement D Native Growth Protection Covenant D Tract D Other 0 Cast in Place Vault D Retaining Wall D Rockery> 4' High D Structural on Steep Slope 0 Other ngineer under my supervision, have visited the site. Actual site conditions as observed were nto is worksheet and the attached Technical Information Report. To the best of my ormation provided here is accurate. 6'•Z. O(.. SI ala 2005 Surface Water Design Manual J11t,,. 1-1.s 1/1/05 PROJECT Seahawks HQ and Training Facility DATE TITLE Fi9.ure 1-2: Site Location DRAWN BY SKETCH# MAGNUSSON KLEMENCIC ASSOCIATES Strud11ral + Civil fn9in1111rs 1301 Fifth Avenue, Suila 3200 S,,,,~lij, Wosl,in9100 98\01-2699 T: 206 292 1:200 f: 206 292 J:?Ol www.mko.com I ----.-- / ! ' I / I I ' ' ' (O<'. L l6l 907. 'f OOl:l Z6l: 91)7; '1 M9l·{O 186 uo15wysoM '"lU""S ooc::c ;w,s 'anuQ,,v '111!1 10£ 1 s.ooa1116u~ l!llf:) + IDJnf""'IS S3J.Vl:)0SSV :) I:)N:!W:11)( NOSSnNQVW ~ .. _, ... ..... 31: ~ i= ~ i= :;. ~ i= "' >< ..... / \,/ \ \ \ \ \ ,,, /f / _/-I I ! I \ / \/ I I ~' ! I I ,\ ' \ z C> I- (.!) z -I CJ) <( :3:: w :::,0:::: <( _J \ \ lftR \ \ \ \ # H1U~S AB NMVllO / ,., • l!VO t,< / ' ',, -~,,--\, ~,, ,;, ~ - SJ!JS[J@pOJDY:) a11s puo 11111 DlroMd ' ... ,,.:."'"'.' /7 / PROJECT Seahawks HQ and Training Facility DATE TITLE Fi_g:ure 1-4: Soils DRAWN BY ~ SKETCH# • •! J Age MAGNUSSON KLEMENCIC ASSOCIATES Struct<Jral T Clvil En9ina.rs 1301 fi~h Avenue, ~"~"' 3200 :i.eMle. Woshifl{,Ton Y!l\0 I "2699 T: W6 292 IWO r, 206 292 l 2lll wNW.mka.ccm ,.,,,-AgC /). ·,J (JvO .') .~~, --c::t;, D I --... - WESTERN KING COUNTY "ROJECT Seahawks HQ and Training Facility LE Figure 11-l: 2-Yeor, 24-hr Precipitation DATE DRAWN BY SKETCH# .. -----3.5 MAGNUSSON I KLEMENCIC ASSOCIATES --:.:-- Slnldunll + CMI !ngl-,: 1301 ffth A-, Sui1ieo 3"200 ~.~9610).2699 T:2062921200 F:2062921201 -- WESTERN KING COUNTY ""OJECT Seahawks HQ and Training Facility Figure 11-2: 25-Year, 24-hr Precipitation 0 2 4 Mites DATE DRAWN BY SKETCH# MAGNUSSON I KLEMENCIC ASSOCIATES --;.:-- Slr!.ldural + CMI bgine,,n. 1301 Atii A'Hl1ue, S..n. 3200 s-.r.. Wmhinglon 98101·2699 T, 2062'921200 f,2062921201 -- WESTERN. KING COUNTY PRWECT Sea hawks HQ and Training· Facility E Figure 11-3: 100-Yeor, 24-hr Precipitation DATE DRAWN BY SKETCH# MAGNUSSON I KLEMENCIC---;..--Assoc1ATEs · i ~+CWI!..,_.. 1301 fitt,"--,~3:100 Seda,. Wmhl,,glor, 98101-2699 T:206ffil:ZOO f;20629'2l2tlf _.,.__ WESTERN. KING COUNTY PROJECT Seahawks HQ and Training Facility Figure 11-3: 100-Yeor, 24-hr Precipitotion DATE DRAWN BY SKETCH# MAGNUSSON I KLEMENCIC ____ _ ASSOCIATES a Slrudural + Cini·~ 1301 Fillfl~-.SU-3200 $.,. Wo&hinglor, 98101_-2699 T;2062921200 F:20629'2120T __.._ i ':::c .~ r- ~ \ \, ! ----··-··---··---··---·· ~·r"1--r· I I ,!l ~ r-;,,: l~;S~ l8v,o, !-t-:C--.... it..ocnm !: :nN~ Ji ... ~ ' iu, cnj ii ' ': ... I r- i ij Ii I 1· I 'i I J \ ' \ . '"' -i:, 11 '· / .---,.1 ( I I I"' l:S en .... "' I~ ~~ ~;:ll i i .., .... ti l'TI l:S "' .... .... ~ 60" EXIST 24" Cl.IP rif & ABANDoiifo .. WHEN NEW P/PfL(N£ IS CONSTRUCTED ~===== ··-··-.. -··-··- \_~ ---··-·---·-. PROJECT Seahawks HQ and Training Facility TITLE figure 111-1: Off-site Flow Conveyance .... '- \ ~ i • I I ( I ' """l I I !\\ I I J I \ l'TI ' l:S ' u, \ (") ... i j ~ I m O I (") C: ' -I -I I ... .., I o '?c / ~ r- / !!l I i I j ··---··-·· I ;~ I ;;: ::a L ~ __j} . ,.~. // ____ .., // /', / / ~ ( / ! ' ; . " !"\..,/" \ '-... .. _i J //·' / l, / / ' ( ,//./ < '·1 \., \ ) I """' i 8 =ii 'f!! r- ~ i ol ... ,..,uuo ..... o .... 8 r )> ::,::::: rn ::E )> (/) :r: :z: G) -I 0 :z: I I i~ I g,,, .... .... ;!~ I ,-..., r- -l; ~, I ffl z I I I I I I I I I I I ·~ .. -··-' ', DATE DRAWN BY SKETCH# MAGNUSSON KLEMENCIC ASSOCIATES Strvchm,I +-Civil Enginaen; 1 301 filrh AY<l<IU&, 5-uile 3200 S,mMt.,, Wo,hingloo 98\01-2699 T: 205 292 1200 F: 206 292 1201 www.m~o com I -.--· PROJECT Seahciwks HQ and Training Facility TITLE Figure 111-2: Gypsy Subbasin .. \ -~··. ', ,-.: 0,. 0,. "' w "' 2 w Ii: w "' i ::, 0 z ~ 0 2 w 2 z (!) vi w 0 I:! z w as > 0 "' 0.. ~ w (!) SEE ~ ~ 0 z --' : I··· ~ "' ::, "' ~ >-(!) .. "®''"" . . . . . ' ............ -I .... ·.·· ·'·6···· . > .. . . . ' -• . : I , w u "' ::, 0 "' • : : 'SE 91st, St DATE DRAWN BY .SKETCH# MAGNUSSON I KLEMENCIC ASSOCIATES --ee.- Slrudum + Cwll lr...- 1301 Rflh>--, S..... 3200 SH111e,. WashhQlal 98101-2699 T:2062921200 F:2062921201 -- I 22 ~ -< i r-! ;zr ~ ;= g C i Q ' i' ,, I I ' ,I I ' jj iJ. I I .1:~ I PRaJECT Seahawks HQ and Training Facility DATE TITLE Figure IV-l: Water Quality Treatment Areas DRAWN BY SKETCH# ' !-~~ . r~ ··---··-·· t . ~:a . ! .... . 2 ___Jl __ ,_,. /', . ' / ! / ! ', / ,r·->,J 7 r // l> ;::,:;:: / rn t~ri, =E l> ·~ (/) :c -z G) ---i I 0 z I I I J I I I i V I I i \ I ( ~~ 4- I I 8 I I I I I /l[IJ~~I I en ~ loll il .. r-..., i!5 ' .,, .. .,, ..... ,/ .,, la! lC ..., --C rn r-r-.... -I C: C) CD G) r'T'l--1>-< :;;u--1,-rn ffe i ~ z· ~ :!! ~ 0 / ..., "' .... r-.. .;II C 1§ .. .... .,, ..., ~I/ C -_, MAGNUSSON I KLEMENCIC __ _ ASSOCIATES • Structutol + Civil Erlgirw,rs 130! 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I ' ' I PROJECT TITLE Seahawks HQ and Training Facility Figure VIII-1-D; Temporary Erosion and Sedimentation Control Plan DATE DRAWN BY SKETCH# MAGNUSSON KLEMENCIC ASSOCIATES Shvdvral + Civil Engin•.,r.s 1301 Fi~hA~e-nve, Su~ 3200 Soortle, W<,shin9l"n 9BI Ol-2699 E 206 292 1200 f: 206 292 1201 www.ml;,;,.com I • APPENDICES I --.- MAGNUSSON KLEMENCIC ASSOCIATES Appendix A Sand Filter Sizing Sea hawks Headquarters and Training Facility Sand Filter Design A,1 = 0.7C,(T,A; + T,A. + ToA.,) A,1 = Sand filter area (/t2) C, = Regional scale factor = 060818 T,,'9,og = Tributary area per sail/cover type (acres} A;,'9.o, = Filter area per soil/cover type (sf/acre} from table Tributary Area (It 2 ) Tributary Area (acre) A.i, filter Area Required (It 2) Proposed Filter Area (It 2) Magnusson Klemencic Associates 060724Seahawks IPF sandfilter Cales.xis 8/24/2006 where i = impervious area tg = till grass og = outwash grass Sand Filter l Sand Filter 2 1 L. 1 L. 59,464 5,037 60,006 14,874 1.37 0.12 1.38 0.34 2,156 2,710 2,195 2,886 Sand Filter Area lncremenfs From KCSWDM Tobie 6.5.2.A St2rage A;,tg,og i;)e~th (ft) & 6., &. 2,654 629 550 2 2,212 524 460 3 1,769 419 370 4 1,572 372 330 5 1,376 326 290 6 l, 179 279 250 Sand filter 3 Sand Filter4 1 L. 1 L. 14,874 2,716 10,213 504 0.34 0.06 0.23 0.01 Total Filter Area 662 441 5,968 1,045 467 6,592 Page l of l Appendix B Onsite Conveyance Calculations (This information will be provided in a future oddendum.) Appendix C Offsite Conveyance (Gypsy Subbosin) Colcu lotions Scenario: Existing Existing Outfall cl'. 1-1 l:\ ... \englneers\ajvlgypsy bypass proposed.&1rn MKA OBJ23I06 02:33:33 PM CBentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1~203-755--1666 StorrnCAO vS..6 [05.06.005.00J Paga 1 of 1 Calculation Results Summary •••==•=--••••==-=----am---===---•==-=-=----=~--=•--==---=-------- Scenario: Exist~ng >>>> Info: Subsurface Network Rooted by: Existing Outfall >>>> Info: SUbsurface Analysis iterations: 1 >>>> Info: Convergence was achieved. CALCUt.ATION SUMMARY FOR SORPAC.E! llra'I'WORKS I Label I Inlet I Inlet I Total I Total I Capture I Gutter I Gutter I I Type I I Intercepted I Bypassed I Efficiency I Spread I Depth I I I I Flow I Flow I (%) I (ft) I (ft) I I I I (cfs) I (cfs) I I I I 1-------1---------------1----------------------1-------------1----------1------------1--------1--------1 I I-1 I Generic Inlet I Generic Default 100% I 0.00 I 0.00 I 100.0 I 0.00 I 0.00 I CALCULATION SUMMARY FOR SUBSORF'ACE NE'lWORK WITH ROOT: Existing outfall I Label I Number I Section I Section I Length I Total I Average I Hydraulic I Hydraulic I J of I Size I Shape I (ft) I Syste111 I Velocity I Grade I Grade I I Sections I I I I Flow I (ft/sl I upstream I Downstream I I I I I I I lcfsJ I I lft> I <tt> I 1-------1----------1---------1----------1--------1--------1----------1-----------1------------1 I P-8 I 1 I 24 inch I Circular I 495.00 I 13.00 I 4.14 I 24.77 I 18.91 I I')~ o.oz.4 Label I Total I Ground I Hydraulic I Hydraulic System I Elevation I Grade I Grade I I Plow I {ft) I Line In I Line Out I I I (cfs) I I 1ft) I {ft) I 1------------------1--------1-----------1-----------1-----------1 I Existing 0utfa11 I 13. oo I 22. oo I 18. so I 18. 80 I I I-1 I 13.oo I 2s.oo I 24.77 I 24.77 I -=--=---=-=---------------------------===------=-----=---=------- Completed, 08/23/2006 02,33:37 PM l:\ .. lenglnee~ bypess proposed.atm MKA 08/23/06 02:33:41 PM O BentJey Systems, Inc. Haestad Methods Solutlon Center Watertown, CT 06795 USA + 1-203-755-1866 StormCAC v5.6 [05.06.005,00J Page 1 of 1 i~i~ ,,,~i! . refile Scenario: Existing Profile: Profile -1 Scenario: Existing I ~ ~ aeiqs• !a:t::;.~t:'; ia! -~-;=:·------=--F::.-..:-.:_:_:_:·::.::. ______ i__ -------------l~--~--~~----------- -------------- 1 i 0,00 __________ _J_ _____ _ 1'00 2'<IO ,.., "llO """'~I 1:1. .. \englneen;laMgypsy bypa8S proposed.Sim MKA 06/23/06 02:33:51 PM C 8enUey Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-2~755•1666 20.0) Elevnctl (Ill 5'00 StonnCAO v5.6 [05.06.005.00) Page 1 ot 1 P-8 I 1-1 DownstroamlLengthlSecaonj Full Node (ft) Size jCapaci (els) Averag Velocltyl Invert (ftls) Elevation (ft) 4.341 4.141 18.23 Scenario: Existing Combined Plpe\Node Report 17.611 0.0012531 24.771 18.911 13.00 l:\. .• \englneersWV\gypsy bypass proposad.stm MKA 22.00 08/23/06 02:34:00 PM C Bentiey System&. Inc. Haestad Metnods Solution Center Watertown, CT 06795 USA +1-203--755-1666 StonnCAD V5.6 (05.06.005.00J Page 1 of 1 1> GB3 ~ GB2 ,0 '7 Scenario: Proposed GB4 P-7 GB1 l:\. .. \engtneers\aj\l\gypsy bypass Mure.stm MKA f ,¢571" N(1 0vrFALl 00 tl. J-4 08/23/06 02:28:05 PM C Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1 ·203-765-1666 StormCAD v5.6 [05.06.005.00J Page 1 of 1 Calculation Results Summary -------=-=---------===----=----------=-----=----------=---=--=--= Scenario: Proposed f:x;:,.+;~ ().,_.\.~\\ ~>>> Info: >>>> Info: >>>> Info: SUbsurface Network Rooted by: ·· Subsurface Analysis iterations: 1 convergence was achieved. CALCOLATION SUMMARY FOR SURFACE NETWORKS Label Inlet Type Inlet Total Intercepted Flow Total Bypassed Flow Capture Efficiency (%) I I Gutter Spread (ft) I . Gutter Depth (ft) I I I I (cfs) I (cfs) I I I I 1-------l---------------l----------------------1-------------1----------I------------I--------I--------I I GB1 I Generic Inlet I Generic Default 100% I 0,00 I 0.00 I 100,0 I 0.00 I 0.00 I c:.ALCUl.,ATI:0N SUMMARY FOR SUBSURFACE NETWORK WITH ROOT: Fut,ure outlet Label I Number I Section I Section I Length I Total I Average I l!Ydraulic I l!Ydraulic of I Size I Shape I 1ft) I System I Velocity I Grade I Grade . I I Sections I I I I Flow I {ft/sl I Upstream I Downstream I I I I I I I lcfsl I I tttl I 1ttl I 1-------1----------1---------1----------1--------1--------1----------1-----------1------------1 • O 01':> I P-8 I l I 24 inch I Circular I 15.00 I 30.00 I 9.55 I 20.46 I 19.47 In· ' I P-7 I l I 24 inch I Circular I 233.47 I 30.00 I 9.55 I 25.90 I 21.80 I"'°' O,Ot) I P-4 I l I 72 inch I Circular I 49.98 I 30.00 I 1.06 J 25.97 I 25.97 J.-,~ O, o t":. J P-6 I 1 J 60 inch I Circular J 400.69 J 30.00 I 1.53 I 26.04 I 25.98 J.,: 0,01"', I_P-1 ___ 1 ________ 1_1 _s4_inch_l _circular_l_l49.69 _1 __ 3o.oo_l _____ 1.89 _I _____ 26.10_1 ______ 26.07 _In O o,O~ Label J Total I Ground I Hydraulic I Hydraulic I J System I Elevation I Grade I Grade I I I Flow I {ft) I Line In I Line out I 1--l=X"-t:2}0~V 1-(cfs) --1-----------1---{ftl ----1 · __ 1ft) ----1 I ··· I 30.00 I 22.00 I 10.00 I 10.00 I I J-4 I 30.00 I 22.30 I 21.00 I 20.46 I I GB4 I 30.00 I 26.37 I 25.97 I 25.90 I I GB3 I 30.00 I 27.00 I 25.98 [ 25.97 I I GB2 I 30.00 [ 27.00 [ 26.07 [ 26.04 [ J GBl I 30.00 [ 26.80 J 26.10 I 26.10 J l:\..lengineers\ajv\gypsy bypass Mure.sun MKA 08/23106 02:27:58 PM 0Bentley S)'$t8mS, Inc. Haestad Methods So1Ution Center Watertown, CT 06795 USA +1-203--755-1666 StormCAD v5.6 (05.06.005.00) Page 1 ot2 See .. _ .. o: Proposed Combined Plpe\Node Report Label j.Jpstrean OownstrearT Lenglh Section Full Average 1,Jpstrearr pownstreai, l::oostruct0< Hydrauli Hydraul~ Total pownstrean Node Node (ft) Size Capaclt) Velocity Invert Invert Slope Grade Grade ~ystem Ground (els) (f!ls) Elevation Elevation (ft/It) Uneln Line Out Flow Elevatlon (ft) (ft) . (ft) (ft) (els) (ft) P-4 GB3 GB4 49.98 72 lnct 133.94 1.06 17.79 17.74 0.001000 25.97 25.97 30.00 26.37 P·1 GB1 GB2 149.69 54 Incl 62.25 1.89 18.35 18.20 0.001002 26.10 26.07 30.00 27.00 P-6 GB2 GB3 400.69 60 incl 83.31 1.53 18.20 17.79 0.001023 26.04 25.98 30.00 27.00 p.7 GB4 J-4 233.47 24inc 3.92 9.55 17.74 17.67 0.000300 25.90 21.80 30.00 22.30 P-8 J-4 -15.00 24inc1 7.75 9.55 17.67 17.61 0.004000 20.46 19.47 30.00 22.00 E.<~ i:\. .. \englneera\ajv\gypsy bypass f1.Ature.stm MICA 08/23/06 02:28:26 PM C Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755--1666 StormCAO vS.6 [05.06.005.00) Page 1 of 1 ~---., --..Mi -· i _j_ __ .. .. -- • -· ·---! Profile Scenario: Proposed Profile: Profile -1 'SCenatio: Pn:iposed .) .. . .. -----·--1-•••• .,.. ·----------, I _.f fii_ ,itl . --.... i .. :_ ~~i j ·~ . ' I ,t ,-1··-----~ = k:d.1 -----t--~ .... J. _____ _ • 1 ---··· 211.llt -... I -....-rw: ---~-. . ; i l i -.. _L. .. -··---·-·-·--··----_j----· i;\. .. \englneers\aMgypey bypass Mure.stm MKA StormCAD VS.6 [05.06.005.00) Page 1 of 1 08/23/06 02:28:15 PM O Bentley Systems, Inc. Haeetad Methods Solution Center Watertown, CT 06795 USA +1""2CJ3.755-186e Scenario: Proposed Future Fut ure Outlet GB3 GB2 GB1 l:\. .• \englneers\ajv\gypsy bypaSs future.stm MKA StormCAD VS.6 [05.08.005.00] 08r.?3/06 02:10:08 IIP\Eentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203,,755-1666 Page 1 of 1 Calculation Results Summary ==============================•m=====================•=========•= Scenario: Proposed Future >>>> Info: Subsurface Network Rooted by: Future outlet >>>> Info: SUbsurface Analysis iterations: l >>>> Info: Convergence was achieved. CALCT.JLATION SUMMARY FOR SURFACE NETWORKS Label Inlet Inlet Total Total Capture I Gutter Gutter I Type Intercepted Bypassed Bfficiency I Spread Depth I I I Flow I Plow I (t) I (ft) I (ft) I I I I I (cfs) I (cfs) I I I I 1-------1---------------1----------------------1-------------1----------1------------1--------1----·---1 I GB1 I Generic Inlet I Generic Default 100% I 0.00 I 0.00 I 100.0 I 0.00 I 0.00 / CALCVLATION SUMMARY FOR SUBSURFACE NE'IWORK WITH ROOT: Futrure outlet Label Number Section of Size Sections Section Shape Length (ft) Total I System I Flow I Average Velocity (ft/s) Hydraulic I Hydraulic Grade j Grade Upstream I Downstream I I I I I I ccts> I I !ft> I Cft> I 1-------1----------1---------1----------1--------1--------1----------1-----------1------------1 -0,01"?, I P-5 I 1 I 72 inch I Circular I 40.00 I 172.00 I 6.08 I 21.74 I 21.27 I"' :0 ,0 ,'l, I P-4 I 1 I 72 inch I Circular / 49.98 I 172.00 I 6.08 I 22.27 I 22.12 I"'-/) 01 -,,. I P-6 I 1 I 60 inch I Circular I 400.69 I 172.00 I 8.76 I 24.47 I 22.73 In: ' I P-1 I 1 I 54 inch I Circular I 149.69 I 172.00 I 10.81 I 26.43 I 25.28 I f\~CJ,bf?, Label Ground Jfydraulic Hydraulic I Grade Grade J Line Out I I I (cfs) I I (ft) I (ft) I Elevation (ft) Line In Total System Flow 1----------------1--------1-----------l-----------1-----------1 I FUtrure outlet I 172.00 I 22.00 I 18.80 I 18.80 I I GB4 I 172.00 I 26.37 I 22.12 I 21.74 I I GB3 I 172.00 I 27.00 I 22.73 I 22.27 I I GB2 I 172.00 I 27.00 I 25.28 I 24.47 I I GBl I 172.00 I 26.80 I 26.43 I 26.43 I -------==------~=------------------=•=----=-=--•-=-===-------zm-- Completed, 08/23/2006 02:10:12 PM l:\. •• \englnee,,,\aj\l\gypsy bypass future,sbn MKA stormCAD VS.6 (05.06.005.00] ()81231()8 02:10:18 DBentley Systems. Inc. Haestad Methocts SohJtion Center Watertown, CT 06795 USA +1~203-755-1668 Page 1 of 1 Scenari_: Proposed Future Combined Pipe\Node Report Label l,Jpstrean Downstrean Length Section Full Average I.Jpstrear bownstrea, Construct• Hydrauli Hydraul~ Total bownstrean Node Node (ft) Size ~.,:.r Velocity Invert Invert Slope Grade Grade lsystem Ground (ft/s) Elevation Elevation (ft/ft) Una In UneOu l Flow Elevation (R) (R) (R) (ft) (cfs) (ft) P-1 GB1 Cl82 149.69 54 incl 6225 10.81 18.35 18.20 0.001002 26.43 25.28 172.00 27.00 P-6 ClB2 GB3 400.69 60 Incl 83.31 8.76 1820 17.79 0.001023 24.47 22.73 172.00 27.00 P-4 ClB3 GB4 49.98 72inct 133.94 6.08 17.79 17.74 0.001000 22.27 22.12 172.00 26.37 P-5 GB4 Fut!" Jre OU1 40.00 72 lnct 133.92 6.08 17.74 17.70 0.001000 21.74 21.27 172.00 22.00 l:\. .. \englneers\ajv\gypsy bypass future.stm MKA 08/23/06 02:16:20 PM CCI Bentley Systems, Inc. Haestad Methods SofutJon Center Watertown, CT 06795 USA + 1-203-755-1666 StonnCAD v5.6 [05.06.005.00J Page 1 of 1 riii ,!~s HH ... --------T" .. -----umJ.---·- -------,---~-', Profile Scenario: Proposed Future Profile: Profile • 1 Scenario! P,oposed Fl.llURII ····-··----·----·-·· T i i· .. ~~ ~--r.~. 1;!~ --11.:.1.---.~m -----r--------------··- ---·---- ~ rim.E ~ - ·.!II& ·-Pl I ···--I I . -· -~ _, i • N .. -··· ·--I ... N i I ...... I ! --, "" I • I .... __ I""' ~ .. , ... It•-.. I I ••·Ml!llcm· I ! i I -· I ... -... -' ' .. I.. ___ _ --· l:\. .• \englneers\ajv\gypsy bypass future..stm MKA ....... ... ... - 08/23/06 02:27:01 PM C BenUey Systems, Inc. Haestad Methods Solutlon Center Watertown, CT 06795 USA + 1"203-755-1666 ___ ,_ .. ___ -~-··-··-----.. , --~-- stormCAD v5.6 [05.06.005.00J Page 1 of 1 Appendix G Integrated Pesticide Management Plan A.C. Kindig & Co. SEAHAWKS CORPORATE HEADQUARTERS and TRAINING FACILITY TURF INTEGRATED PEST MANAGEMENT PLAN (1PM) Prepared for: Football Northwest LLC 505 Fifth Avenue South, Suite 900 Seattle, WA 98104 Prepared by. A.C. Kindig & Co. 12501 Bellevue-Redmond Road, Suite 110 Bellevue, Washington 98005 425-638-0358 Fax: 425-455-8365 September 20, 2006 Project No. 283 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) TABLE OF CONTENTS Page 1.0 INTRODUCTION .................................................................................................................... 1 2.0 INTEGRATED PEST MANAGEMENT ................................................................................. 2 2.1 Components and Strategy ................................................................................................. 2 2.2 Turf Seeding Species and Varieties .................................................................................. 3 2.3 Turf Fertilization .............................................................................................................. .3 2.4 Turfgrass Pest Control Under IPM ................................................................................... 6 3.0 PRACTICE FIELD STAFF .................................................................................................... 15 4.0 MAINTENANCE/OPERATIONS CHEMICAL MANAGEMENT ..................................... 15 4.1 State Requirements for On-Site Chemical Storage and Chemical Handling .................. 15 4.2 State Requirements for Maintenance Area Drainage Control ........................................ 19 5 .0 REFERENCES ....................................................................................................................... 20 LIST OF TABLES Table I Typical maintenance fertilization program ....................................................................... 4 Table 2 Summary of pest control measures ................................................................................... 7 Table 3 Pest Tolerance Thresholds ................................................................................................ 8 Table 4 Pesticide application rates and intervals ......................................................................... 10 Table 5 Pesticide chemical characteristics summary ................................................................... 12 Pesticide Assessments Chipco 26GT Heritage Primo Maxx Prograss September 20. 2006 APPENDIX A A. C. KINDIG & CO. Page i Seattle Seahawks Corporate Headquarters and Training Facility Twf Integrated Pest Management Plan (!PM) SEATTLESEAHAWKSCORPORATEHEADQUARTERS AND TRAINING FACILITY TURF INTEGRATED PEST MANAGEMENT PLAN (1PM} 1.0 INTRODUCTION This IPM addresses management techniques and anticipated chemical uses on the Seahawks Headquarters turf practice fields. While the management of the practice fields is described according to current plans, modification of the management techniques described in this 1PM should be anticipated to address site-specific turf needs that develop, new and perhaps superior turf management chemicals that may be developed and approved for turf use in Washington State, or new IPM approaches as they develop. Seahawks turf management will allow for the use of new or alternative products that are shown to be more effective, exhibit greater target specificity, are less mobile, and/or can otherwise reduce environmental risk in the future. Management techniques covered by this 1PM include the following practices: • Turf Practice Field Management Techniques • IPM Strategy and Chemicals • Maintenance Chemical Use, Storage, and Disposal • Accidental Spill and Response An IPM program is key to modem turf sports field durability and maintenance and for achieving environmental objectives. IPM focuses on the use of best management practices (BMPs) to create healthy and disease-resistant sports field turf by use of durable and disease resistant turf species and varieties, physical control of drainage and light, adaptive fertilization and watering regimes, and cultural control of soils. Healthy turf minimizes disease which reduces the use of fungicides and herbicides when proper application methods, judicious chemical selection, and proper irrigation methods are employed (Petrovic 1995). In addition, pest damage threshold levels are established under IPM, and chemical treatment occurs on an as-needed basis, if at all, for weed or insect pests as a backup control treatment only cultural controls fail to prevent their outbreaks. Fungus diseases are more ubiquitous and form the exception, requiring routine seasonal prevention treatment to prevent outbreaks that would increase need for higher curative fungicide doses and could render the sports fields unsuitable for the stress of Seahawks practice requirements. Pest damage levels and comparison to response thresholds will be determined through on-site monitoring of the turf by the practice field manager and staff. September 20, 2006 A.C. KINDIG & CO. Page I Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (IP M) 2.0 INTEGRATED PEST MANAGEMENT 2.1 Components and Strategy Chapter 17.15.010 of the Revised Code of Washington (RCW) defines IPM as "a coordinated action process that ttSes the most appropriate pest control methods and strategy in an environmentally and economically sound manner to meet ... programmatic pest management objectives. " IPM is achieved through the use of combined and balanced strategies of cultural, biological, physical or mechanical, chemical, and other control technologies (King County 1993; King County 1999). IPM turf management strategies stress turf disease resistance, turf health, pest tolerance limits, and alternatives to pesticides to minimize their use. For example, the Seahawks IPM seeks to control an insect pests by cultural methods; no insecticides are expected to be necessary. Likewise, IPM is designed to be flexible by including adaptive modifications to optimize turf health and disease resistance while reducing impacts to the surrounding environment. Healthy turf is less susceptible to disease and pests, and in the long-term, requires less fertilizer and pesticide treatment. By its nature, IPM avoids and/or minimizes off-site transport of pesticides and fertilizers. The following approach and sieps define the IPM process that will be employed at the Seahawks Headquarters and Practice Fields (Washington State University [WSU] 1980; Berndt 1992; King County 1999; Chapter 17.15.10 RCW): (1) (2) (3) Jnfonnation Gathering: Regional pests expected to require management on the practice fields have been, to the extent possible, identified and anticipated in this 1PM. Pests include insects, plants, and plant pathogens, including fungi, bacteria, viruses, and nematodes. Monitoring: The practice field manager will assess the type, timing, and extent of any observed pest problems on a near-daily basis. These observations will indicate when and what pest control measures are required given pre-defined pest tolerance levels. Detennine Economic Jajucy and Action Thresholds: The relationship between pest populations, the amount of damage, and the cost effectiveness of various pest control options have been assessed by the practice field manager to establish pest tolerance thresholds below which treatment is not initiated. Cultural, physical or mechanical practices will be employed in preference to chemical control measures to the extent practicable. Chemical controls will be used when they are determined by the practice field manager to be the most environmentally responsible control method, the safest method to address the pest problem, and where other control tactics cannot be relied upon to meet pest tolerance levels. September 20. 2006 A. C. KINDIG & CO. Page 2 Seattle Seahmvks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) (4) (5) Record Keeping: Records describing the process and methods employed to address pest problems are kept by the practice field manager. Treatment Evaluation: Evaluations of the strategies employed and their effectiveness in controlling pest problems are part of adaptive management by the practice field manager. 2.2 Turf Seeding Species and Varieties Turf varieties were selected based on their growth habit, vigor, disease resistance, and resistance to weed encroachment. The practice fields will be comprised on three varieties (80%) Kentucky Bluegrass and three varieties (20%) of Perennial Rye. All the varieties selected have been shown to be resistant to fungus diseases (primarily using Leaf Spot as an indicator for resistance), and for superior shear strength to be durable to the turf stresses from Seahawks practice. Use of this turf blend will give resilient turt; reducing weeds and turf diseases needing treatment, and minimizing fertilizer losses from the actively growing root zone. 2.3 TurfFertilization Overview During fertilizer applications, field maintenance personnel will adhere to all applicable Washington State Industrial Safety and Health Act (WISHA) and Occupational Safety and Health Administration (OSHA) regulations. The three main nutrients in turf fertilizer are phosphorus, potassium, and nitrogen. The potential for adverse impacts to water quality from the delivery of phosphorus and nitrogen to Lake Washington has been considered by the practice field manager. This concern is mitigated by 1PM as a source control measure, and by increasing sand depth under the practice fields to 18 inches to equal sand filter treatment for water quality for I 00% of the turf drainage. This level of water quality treatment will be superior to that usually employed for phosphorus-sensitive lakes (Lake Washington is not determined to be phosphorus sensitive) and for sensitive fish habitat under the 2005 King County Surface Water Design Manual approved by the Washington State Department of Ecology as ensuring compliance with state surface water quality standards under WAC 173-201A. The fertilization program includes nutrients and trace minerals (Table I) to maximize turf health and vigor to minimize pesticide need. Off-site nutrient transport will be avoided through reliance on granular slow release fertilizer for most applications, application rates and application frequencies, and through course irrigation and drainage control. Trace minerals and organics will be used to ensure the turf have all requirements necessary to make use of the fertilizer nutrients during the growing season, which minimizes nutrient loss from the turf rooted zone. From time to time, soil chemistry analysis may be conducted by the practice field. manager to determine turf growth requirements if warranted. September 20, 2006 A.C. KINDIG & CO. Page 3 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (/PM) Table 1 Typical Maintenance Fertilization Program Product Soluble% or Application Nitrogen (N) Phosphorus (P) Potassium (K) % Liauid % Granular Slow Release % Month lbs/1.000 ft 2/vear lbs/1-000 ft 2/vear lbs/1,000 ft 2/vear March 1.0 0.25 1_0 Aoril 1.0 0.25 1.0 Mav 1.0 0.25 1.0 Fertilizer Slow-100% June 1.0 0.25 1.0 100% Julv 1.0 0.25 1.0 Auaust 1.0 -0.25 1.0 Seotember 1.0 0.25 1.0 October 1.0 0.25 1.0 Roots 1-2-3 Soluble -100% Every 28 days Trace minerals and organics' at 5.87 oz/1,000 tt2 100% Speedy Green March through Soluble nitrogen (15%), iron (6%), and magnesium (0.5°~ in 100% Soluble -100% December natural oraanic acid chelate solution at 5.87 oz/1.000 1 liquid humics, seaweed extracts, iron, manganese, zinc, magnesium phosphate-citrate, organic surfactant September 20, 2006 A.C. KINDIG & CO. Page4 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (IPM) Nitrogen (N) Turf grass requires nitrogen in the largest amount in terms of physiological functioning relative to other essential nutrients with the exception of carbon, hydrogen, and oxygen (Beard 1973). Nitrogen is required for plant tissue growth, enzyme production, and carbohydrate utilization, and is also an essential component of chlorophyll, amino acids, proteins, and protoplasm (Brady 1984). Nitrogen occurs naturally in soils in four major forms: organic nitrogen, ammonium nitrate (NH.,N03), soluble inorganic ammonium, and nitrate compounds (N0.3 ). Surface soils are mostly comprised of nitrogen sources associated with the decomposition of organic matter. Some clays have the ability to fix nitrogen between their layers. There are many types of synthetic inorganic and organic nitrogen fertilizers that have slow release forms. Slow release nutrients are insoluble and generally take 4 to 12 weeks to become completely liberated and available for turf utilization. Several types of slow release nitrogen include: urea formaldehyde, isobutylidene diurea (IBDU), sulfur-coated urea, and mixtures using natural organic sources. Nitrate-nitrogen added to soils, either naturally by plants and animals or by fertilizers, may follow four pathways (Brady 1984): (I) incorporation into microorganisms; (2) assimilation into higher plants; (3) loss to subsurface drainage (ground water); or (4) escape to the atmosphere in gaseous form. The rate and frequency of fertilizer application and the type of applied fertilizer are significant factors that affect the potential for applied nitrogen losses from turf and are therefore adjusted to minimize water quality impact (Cohen et al. 1990). Fertilization guidelines wiH be followed as described in this IPM, thereby allowing for the proper allocation in the amount, distribution, and timing of nitrogen fertilizers to maximize nitrogen utilization by the course turf and, therefore, minimizing the potential for runoff into the drainage system. Phosphorus (P) Phosphorus is an essential macronutrient found in all living cells (Beard 1973). Phosphorus is involved in many physiological functions within turfgrass including: (I) energy transformations in the form of adenosine triphosphate (ATP); (2) incorporation into the genetic material of the cell nucleus; and (3) carbohydrate transformations, such as the conversion of starch to sugar. The probability of phosphorus escaping from the practice field soils and environs is low because of the chemical characteristics of phosphorus and the irrigation system controls to prevent overwatering. Phosphorus is readily mineralized and immobilized (attracted and adsorbed by ionic reactions with cations) by iron, aluminum, and calcium which naturally exist in sand that September 20, 2006 A.C. KINDIG & CO. Page 5 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan_ (IPM) will be placed to 18-inch depth under the practice fields. Plant available phosphorus will only be applied in amounts necessary to provide adequate nutrient levels for optimal turf growth. Overfertilization and overwatering are contributing factors to phosphorus leaching and will be avoided through 1PM. Potassium {K) Potassium is essential for normal turfgrass growth and development processes (Beard 1973). Physiological functions of potassium within turf grass include: (I) carbohydrate synthesis and translocation; (2) amino acid and protein synthesis; (3) regulating transpiration; ( 4) controlling the uptake of certain nutrients; and (5) regulating transpiration. A common form of potassium in fertilizers is potash (K2C03), which is soluble and readily available to turf. Different forms of potassium fertilizer include: potassium chloride (KC!); potassium sulfate (K2S04); potassium magnesium sulfate; manure salts (mainly KC!); kainit (mainly KC!); and potassium nitrate (KNOJ). The application of potassium fertilizers has little probability of locally altering water quality. In its available form, potassium is not prone to leach from soils. Most potassium fertilizers do not alter soil pH and are held in the soil by cation exchange processes. Once in the soil, potassium (K) replaces other soil elements such as calcium (Ca) and hydrogen (H). There are abundant anion binding sites in soils for the single charge cations such as Ca+, K+, and tt•. While K+ additions would compete with Ca+ and W for binding sites, there is no reasonable expectation that this displacement would alter soil chemistry away from the immediate point of application. 2.4 Turfgrass Pest Control Under 1PM Overview Turfgrass pests and diseases requiring control on the Seahawks practice fields are identified in Table 2, as are the management methods (i.e. cultural, physical/mechanical, biological, etc.) that will be employed to minimize chemical control methods. Turfgrass pests and diseases not listed in Table 2 are either not expected to occur, or not expected to require chemical control measures on the.practice fields. September 20. 2006 A. C. KINDIG & CO. Page 6 Seattle Seahawks Corporate Headquarters and Training FaciHty Turf Integrated Pest Management Plan (1PM) Table2 Summary of Pest Control Measures to be used for the Seahawks Practice Fields Physical/ Disease or Pest Cultural Control Mechanical Chemical Control Control Turfgrass Control Primo Maxx Turf growth suppressant Overseeding with (Trinexapac-ethyl) and Annual Bluegrass desirable during growing IPoa annual control turfgrass; season Promote vigorous Prograss turf root growth to ( ethofumesate) for with soil nutrient curative post- Weeds and irrigation emergence control Annual Bluegrass control, to out-of annual competePoa bluegrass in fall annua. and in spring if warranted. Fungus Diseases Brown Patch (Rhizoctonia solani; R. blight) Corticum Red Thread (Laetisaria fucifonnis) Dollar Spot (Lanzia spp. And Moel/erodiscus spp.) Fusarium Blight Chipco 26GT (Fusarium spp.) (lprodione) Fusarium Patch Good air as preventative (Microduchium niva/e) Gray Snow Mold Promote vigorous circulation; method of control Good drainage; fall and spring (Typhula spp.) turf root growth to Helminthosporium with soil nutrient Avoid shading; (Dresch/era spp.J and irrigation Avoid irrigating in Necrotic Ring Spot late afternoon; (Leptosphaeria korrae) control, to out-Limn thatch; Pink Snow Mold compete weeds. Maintain soil pH (Fusairum nivale) <7 Rust tPuccinia coronata) Fungus Diseases Brown Patch (Rhizoctonia solani; R. blight) Herttage Fusarium Patch (azoxystrobin) (Microduchium nivale) as preventative Rust method of control (Puccinia coronate) in fall and winter Take-all Patch /Gaeumannom=s araminis) September 20, 2006 A.C. KINDIG & CO. Page 7 Seattle Seahawks Corporate Headquarters and Training Facility Tuif Integrated Pest Management Plan (IP M) Table 3 Pest Tolerance Thresholds Pest Tolerance Threshold Funous Diseases Zero tolerance BroadleafWeeds Five weeds per 1,000 ft' No oesticide manaoement proposed Annual Blueorass One =uare foot =tches Insects No pesticide manaaement proposed Pest and Disease Tolerance Thresholds Turf pest or disease tolerance thresholds are established by this IPM plan to determioe wheo curative action is warranted, which may require chemical management (Table 3). With the exception of fungus diseases, pests are not managed for total eradicatioo at all times. Cultural Control of Turfgrass Pests Under IPM, cultural control methods (Table 2), in combination with disease and pest tolerance thresholds (Table 3), take priority over chemical cootrol methods to mioimize the use of chemicals to manage turfgrass weeds. No chemical control is proposed for insects or broadleaf weeds. Cultural methods include all management activities that prevent pests from developing due to the enhancement of desirable vegetation which out-competes or otherwise resists pests and disease, including but not limited to irrigation, seeding, and fertilizing. Periodic soil testing as warranted, addition of soil amendments (i.e., trace minerals) as indicated, and fertilization at rates that match turf growth requirements are cultural methods whereby the practice field manager will provide for vigorous turf root growth and disease resistance. Vigorous root growth allows turf to crowd out broadleaf weeds and self-repair damage from common turf pests such as European cranefly (Tipula paludosa). Avoidance of phosphorus and potassium deficiencies can prevent or minimize the occurrence of take-all patch (Gaeumannomyces graminis) fungus disease. Irrigation control and avoidance of overwatering, as well as control of the irrigation timing, are other means used by the practice field manager to prevent excessive soil and grass moisture conditions that can otherwise lead to fungus diseases, leaching of nutrients from the rooted zone, and invasion of annual bluegrass (Poa annua). PhysicaJ/Mechanical Control ofTurfg.rass Diseases, Weeds, and Insects Physical, mechanical, or management methods are also used to control pests. For example, avoiding aerifier holes during the annual period of egg laying by armyworm (Pseudaletia unipuncla) or black cutworm (Agro tis ipsilon) moths prevents the females from depositing their eggs io the turf rooted zone. Taking this precaution eliminates any need for further control of September 20, 2006 A. C. KINDIG & CO. Page 8 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) these pests to prevent turf damage that would interfere with practice field resilience and use. Even allowance for good air circulation through surrounding plantings can help minimize conditions leading to fungus disease, which is one reason some understory trimming (but not of the canopy) of native trees along the Lake Washington shoreline is proposed. Chemical Control of Turf grass Diseases and Weeds Despite the emphasis on cultural and physical/mechanical control practices and pest tolerance thresholds, annual bluegrass that cannot be hand eradicated and diseases are expected to occur on the practice fields, which will require the use of pesticides. A list of pesticides that will be used on the practice fields is provided in Table 4, indicating application rates and preventative or curative strategies employed for each. Preventative applications are those made over the entire practice fields to prevent a disease from occurring. Curative applications are spot-applied only with hand pressure sprayers to diseased areas (fungus) or to broadleaf weeds that cannot be hand pulled because they re-sprout from roots left behind or are too high in number to otherwise control due to invasion by offsite seed stock. This pesticide list may change over time as new chemical products with lower toxicity, greater specificity, less persistence, or less mobility become available. Pesticide Selection Process The pesticides that will be used were selected using the following hierarchy: I. Can cultural controls or alternative control methods be expected to adequately control any diseases or pests without pesticides? a. YES for insects; No insecticides proposed. b. YES for rodents and burrowing animals; No rodenticides proposed. c. YES for most weeds; No broadleaf pesticides proposed. d. NO for annual bluegrass (Poa annua). e. NO for fungus diseases. 2. What are the fungus diseases and weed pests expected for the practice fields? a. These are identified in Table 2. b. Tolerance thresholds are identified in Table 3. September 20, 2006 A.C. KINDIG & CO. Page 9 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) Table4 Pesticide Application Rates and Intervals Product Category Application Rate Application Season & Curative• or Freauencv Preventative3 4.0 fl. oz./1,000 rr Fall through Spring; Chipco26GT Fungicide Nol more than 35 fl. oz./1000 tt2 I yr Once per 2 to 3 weeks for Preventative or 6 annJicatlons n,:,.r vear preventative control Spring and fall; Two Heritage Fungicide 0.4 fl. oz./1,000 tr applications 28 days apart (4 Preventative annlications total\ Herbicide Through the growing season Primo Maxx (growth 0.25 fl. oz./1,000 tt2 (March to October); about Curative inhibitor) once every 4 weeks Fall; 2-3 applications at 21- Prograss Herbicide 1.5 fl. oz./1,000 fr 28 day intervals; Curative One spring application if needed 2 Curative use means spot applicatons (hand sprayers) after disease or weed problem is detected. 3 Preventative use means application to practice fields to prevent diseases when conditions are prone to their occurrence. September 20, 2006 Comments Preventative applications when conditions favor disease development Used in rotation with other fungicides to prevent disease resistance Enhances establishment of desirable grasses by suppression of Paa annua arowth. Post-emergence control of Paa annua (annual bluegrass) A. C. KINDIG & CO. Page 10 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (JP M) c. The need to treat in advance of a disease known to readily occur, or the ability to only respond with curative treatments to diseased areas after the disease occurs is identified in Table 4. 3. For those pests expected to occur and requiring pesticides to adequateiy control, what are the appropriate pesticides? a. Only Washington State and U.S. Environmental Protection Agency (EPA) approved management chemicals for specific diseases or weeds on turf are legal to use. b. Among the products legal for a specific disease or weed and for turf application, products with the lowest persistence, lowest mobility, and lowest toxicity to non-target, off-site species such as fish, other aquatic species, birds, and bees were preferred for any specific disease or weed problem (Table 5). i. ii. iii. iv. V. September 20, 2006 Lowest mobility is generally ranked with the most importance if all other factors are near equal between choices, because if the product stays where applied, longer persistence is not a problem and toxicity is not a problem. Indeed, longer persistence plus low mobility would mean that a small amount of product will have a lasting intended effect on the turf disease. In some cases, depending on season of expected use (low rainfall periods), low persistence can similarly offset higher mobility, particularly if the aquatic toxicity is very low. For preventative chemicals with broadscale application, low mobility, and/or very low aquatic toxicity were always important criteria. For curative chemicals with spot application only to diseased areas or weeds, moderate to low toxicity was sought in combination with either low to moderate persistence or low to moderate mobility, to the extent possible. See also the discussions and references provided for each proposed product in Appendix A. For fungus diseases, rotational use of two or more fungicides is usually required to prevent or respond to disease resistance to any one treatment. A. C. KINDIG & CO. Page II Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) Table 5 Pesticide Chemical Characteristics Summary Product/Active EPA Registration Category Mobility4 Persistence• Ingredient No. Chioco 26GT Funaicide 432-888 Low Short-lived Heritage Fungicide 10182-408 Low Short-lived fazaxvstrobinl Primo Maxx Turf Growth 100-937 High Very short to short- fTrinexa=o-ethv/J Sunnressant lived Prograss Herbicide for Poa annua 45639-00062 High Moderately short-lived (ethofumesate) control Pesticide Movement Toxicity Rating• Low Slight Low• High nla Slight Moderate Slight 4 Ranking criteria from King County (1993) . 5 Ranking criteria from Vogue et al. (1994); derived from Groundwater Ubiquity Score (GUS) relating pesticide pers.istence (half-life) and soil sorption coefficients (K00). GUS= log 1o(half-life) x (4-log10 Koo). 6 Koc data not available for GUS computation, however EPA Pesticide Fact Sheet reports " ... field dissipation studies indicate ... moderately immobile and relatively no~persistent under actual use conditions." September 20, 2006 A.C. KINDIG & CO. Page 12 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) Fungus Diseases The diseases listed in Table 2 are common fungi on Pacific Northwest turf that are expected to require chemical control. There are no effective alternatives to fungicide control for these diseases once they take hold, although careful turf culture will increase turf resistance. If allowed to occur, small patches of fungus disease on the practice fields would be spread by the heavy practice foot traffic and by mowers to all areas of the fields. Because of the intense use of these fields and the need for the turf to stand up to considerable stress from football practice, fungus disease that weakens the turf must be avoided and there is zero tolerance for their occurrence. On the rare occasions when fungus infestations are not readily identifiable by the practice field manager, samples will be sent to Washington State University's Puyallup turf extension service for analysis. Laboratory results are usually available within 48 to 72 hours to guide control measures on the fields. The fungus disease chemicals proposed for preventative use on the practice fields are listed and evaluated in Appendix A. The list of fungicides may change over time as new products become available that meet the environmental objectives of the Lake Washington setting and the practice fields. Cultural controls or manual removal are expected to be sufficient to control broadleafweeds. If threshold levels for broadleaf weeds are exceeded and cultural/hand control measures are not effective, use of broadleaf pesticides may need to be considered; however experience with the practice fields in Kirkland indicates this is very unlikely. Over time, annual bluegrass is expected to invade the practice fields from off-site seed stock sources. Because this annual turfgrass species lacks the resistance characteristics necessary for practice field durability but would tend to dominate the turf over time, it will be controlled by curative treatments to kill new seedlings in the fall and if warranted spring, and by use of a turf growth suppressant to impede the ability of annual bluegrass that does establish each year to dominate the desirable turf species and varieties. The European cranefly is the most common Pacific Northwest turf pest (OSU 2006b). The European cranefly larvae feed on grass roots during warmer periods from fall to spring, causing the turf to brown and die. Cultural control measures (Table 2) are expected to control insects below tolerance thresholds (Table 3), and consequently no insecticide use is proposed. Application Guidelines Manufacturer application guidelines and directions will be adhered to during all pesticide applications, and all pesticides will be applied by Washington State licensed applicators. See Table 4 for summaries of the pesticides that would be used See Appendix A for detailed September 20, 2006 A.C. KINDIG & CO. Page 13 Sealtle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) environmental assessments based on the best available science for each pesticide. Weather forecasts will be used when undertaking any pesticide applications. Application Equipment Sprayers and spreaders would be used according to application rates, intervals, and seasonal applications guidelines noted in Table 4 and Appendix A. Sprayers Two common forms of sprayers exist, tractor-drawn or mounted, and hand sprayers. Tractor- drawn sprayers are only used for large area applications. Maintenance personnel will adhere to all applicable WISHA and OSHA regulations during all management chemical applications. Tractor-drawn or mounted sprayers have a series of down-aimed nozzles that spray directly onto the turf. Tractor-drawn or mounted spray equipment use will only occur on non-windy days to prevent wind-throw off of the turf. Hand Pressured Sprayers Two types of hand pressure sprayers may be used: backpack or hand carried. Hand sprayers are used for curative spot treatments. Due to their target site specificity, application of management chemicals via hand sprayers allow for controlled pesticide applications regardless of wind conditions. Spreaders Spreaders are generally used for application of fertilizers and seed. Tractor units and/or smaller walking spreaders or truckster-mounted spreaders may be used. Identification of Chemical Hazards to Staff and Public Pesticide and fertilizer container labeling will be in accordance with Chapter 16-201-170 Washington Administrative Code (WAC) and Chapter 16-229-180 WAC. Persons applying management chemicals will comply with use regulations described in Chapter 16-228-185 WAC. The practice field manager will keep appropriate chemical information on file for inspection (Chapter 16-228-190 WAC). Cleanup Cleanup of all spraying equipment will adhere to Washington State Department of Agriculture (WSDA) regulations. Tanks of spray equipment and spreaders will be filled with water three times and sprayed over the turf after pesticide application (Chapter 16-201-190 WAC; Chapter 16-229-400 WAC), before being returned to the wash drain pad. Only as much pesticide as will September 20. 2006 A.C. KINDIG & CO. Page 14 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM} be used in a single application would be placed in the application equipment. Should excess mixed pesticide occur, the surplus will be immediately collected for reuse (Chapter 16-201-230 WAC; Chapter 16-229-250 WAC), or if not reusable, will be disposed of in accordance with all applicable laws and regulations, including but not limited to the Hazardous Waste Management Act (Chapter 70.105 RCW) and the Water Pollution Control Act (Chapter 90.48 RCW), and King County Code 9.12 (see also the King County Stormwater Pollution Control Manual BMP discussion in Section 6.3). 3.0 PRACTICE FIELD STAFF A qualified turf manager selected by the Seahawks will be responsible for implementation of this 1PM. The manager's background may include education or experience in turfgrass management current with industry standards and science, certification(s) in pesticide application, and awareness of pertinent environmental issues and concerns related to turf management. The practice field manager will be responsible for training permanent and/or seasonal assistants in the pest management strategies and specific maintenance standards implemented under the 1PM program. All persons who apply pesticides will be licensed per requirements of the Washington Pesticide Control Act (RCW 15.58), Washington Pesticide Application Action (RCW 17.21) and regulations in 16.201 WAC and 16.228 WAC. Such licensing does not apply to grounds maintenance staff using only general use pesticides on an occasional basis not amounting to a regular occupation. Pesticide applicators must undergo 40 hours of continuing education every 5 years to maintain licensing. Applications of products in Appendix A would be the job of licensed applicators. 4.0 MAINTENANCE/OPERATIONS CHEMICAL MANAGEMENT A permanent operations structure for storage of course equipment and management chemicals will be constructed in accordance with all applicable state and local requirements. 4.1 State Requirements for On-Site Chemical Storage and Chemical Handling; Secondary Containment of Management Chemicals Spill Prevention Turfgrass management chemicals will be stored in a maintenance building in accordance with WSDA's Rules Relating to Secondary and Operational Area Containment for Bulk Pesticide (Chapter 16-229 WAC) and Fertilizer Bulk Storage and Operation Area Containment (Chapter 16-201 WAC). A separate area roofed will be used for the mixing and loading of management chemicals. The area used for such operations, at a minimum, will be a roofed area adjoining the September 20, 2006 A.C KINDIG & CO. Page 15 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) chemical storage facility. Spill prevention measures will be employed to prevent environmental and human health risks through inappropriate use of management chemicals or accidental spills. Key elements in spill prevention for the maintenance building include the following: • Fungicides, herbicides, insecticides, and fertilizers will be stored in a maintenance building designed to prevent the release of chemicals (Chapter 16-201-020 WAC; Chapter 16-229-020 WAC). The floor of the building will be lined to prevent leakage and sloped to a liquid-tight collection point or sump that allows easy removal of spilled or deposited material (Chapter 16-201-030 WAC; Chapter 16- 229-040 WAC). The facility will also be constructed with a watertight ceiling and walls that prevent chemicals leaking from the building (Chapter 16-201-028 WAC; Chapter 16-229-030 WAC). • Within the secondary storage facility, fungicides, herbicides, insecticides, and fertilizers will be secured in storage containers resistant to corrosion, puncture, or cracking (Chapter 16-201-100 WAC; Chapter 16-229-100 WAC). The storage containers will be labeled (Chapter 16-201-170 WAC; Chapter 16-229-180 WAC) and ventilated (Chapter 16-229-160 WAC) in accordance with state regulations. • Within the storage facility, fungicides, herbicides, insecticides, and fertilizers will be stored in their original containers with labels intact. Copies of the product labels and MSDS will be inserted in a logbook. • The maintenance building will not have discharge outlets or valves (Chapter 16- 201-050 WAC; Chapter 16-229-060 WAC). Fungicide, herbicide, insecticide, and fertilizer mixing will be completed in a site constructed to contain 125 percent the capacity of the largest storage container. The mixing/loading site will use concrete curbs or other means for spill containment (Chapter 16-201-190 WAC; Chapter 16-229-210 WAC). The floor of the mixing/loading site will be constructed of concrete or other material with similar permeability. The floor will be sloped to a liquid-tight collection point or sump that allows spilled or deposited material to be easily recovered (Chapter 16-201-190 WAC; Chapter 16-229-210 WAC). • Discharges of fungicides, herbicides, insecticides, and fertilizers occurring within the maintenance building will be immediately recovered (Chapter 16-201-080 WAC; Chapter 16-229-090 WAC) and reused per product label if possible, or otherwise disposed in an approved off-site location consistent with the Hazardous Waste Management Act (Chapter 70.105 RCW) and the Water Pollution Control Act (Chapter 90.48 RCW). September 20, 2006 A.C. KINDIG & CO. Page 16 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (IP M) • No other commodity except pesticides (including fungicides, herbicides, and insecticides), pesticide rinsate, or recovered pesticide discharges will be stored within the pesticide secondary containment facility (Chapter 16-229-070 WAC). The pesticide secondary containment facility may share an impermeable wall or portion of a wall with the fertilizer secondary containment facility. Fertilizer rinsate will be stored in the fertilizer secondary containment facility. • All management chemical storage areas will be secured by a locked door to provide reasonable protection against vandalism or unauthorized access (Chapter 16-201-160 WAC; Chapter 16-229-170 WAC). • Precise records of chemical applications will be maintained on Form AGR 4253 as required by the WSDA. • Pesticides will be applied according to regulations specified in Chapter 17.21 RCW, Washington Pesticide Application Act and Rules Relating to General Pesticide Use (Chapter 16-228-190 WAC). • Fungicide, herbicide, and insecticide mixing and application will be performed according to the manufacturer's instructions and under the direct supervision of a licensed applicator. • Cleaning and maintenance of chemical application equipment that comes in direct contact with any pesticide or fertilizer will be performed in a site constructed to contain 125 percent the capacity of the largest storage container. The site will use concrete curbs for rinsate containment (Chapter 16-201-190 WAC; Chapter 16- 229-210 WAC). The equipment wash pad located adjacent to the maintenance building will be roofed and drain to the sanitary sewer, not the stormwater system. Accidental Spill Response Plan A spill response plan will be activated for spills or leaks of management chemicals that occur despite prevention measures listed above. This plan would comply with applicable federal, state (Chapter 16-201-260 WAC; Chapter 16-229-280 WAC), and city laws. Major provisions of the proposed accidental spill response plan are the following: Accidental Spill Response Procedure The following items must be in place and an inventory of these items posted in the chemical storage area: (I) September 20, 2006 Telephone numbers for emergency assistance, including the City of Renton law enforcement and fire departments. A.C. KINDIG & CO. Page 17 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) (2) Sturdy gloves, footwear, and apron that are chemical resistant to most pesticides, such as foil-laminate gear and protective eyewear. (3) An appropriate respirator, if any of the spilled materials require such during handling activities or for spill cleanup (reference MSDS on file for each product used). ( 4) Containment "snakes", or booms, to confine the leak or spill to a small area. (5) Absorbent materials, such a spill pillows, absorbent clay, dry peat moss, or sawdust to soak up liquid spills. ( 6) Seeping compound to keep dry spills from drifting or wafting during cleanup. (7) A shovel, broom, and dustpan made from nonsparking and nonreactive material. (8) Heavy-duty detergent. (9) A fire extinguisher rated for all fire types . . ( I 0) Any other spill cleanup items specified on the labels of any products used. (11) A sturdy plastic container with a tightly closing lid that will hold the quantity of spilled material from the largest pesticide container being handled. Spill Responding Employees will be required to have proficiency in spill response procedures. (I) Reporting the Spill September 20, 2006 As soon as possible after a spill has been identified, the practice field manager will be notified and have responsibility for reporting all spills to the list of responsible parties, the city Emergency Agency responsible for rapid response, and Ecology's Hazardous Substance Information Office. The following will be reported; (a) Name and phone number of reporting party A.C. KINDIG & CO. Page 18 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) (b) Time and location of spill ( c) Identity and quantity of material released ( d) Status of cleanup and containment. (2) Controlling the Spill On-site responders will: (a) protect themselves with appropriate protective clothing and eyewear; (b) stop the source of the spill; (c) protect others by warning them of the spill; and (d) stay at the site until the spill is cleaned up. (3) Containing the Spill On-site responders shall: (a) confine the spill as quickly as possible; (b) protect water sources and water resources; ( c) absorb liquids with absorbent material; and ( d) cover dry materials to prevent them from becoming airborne or solubilized. ( 4) Cleaning up the Spill On-site responders shall: (a) cleanup the spill; (b) decontaminate the spill site; ( c) neutralize the spill site; ( d) decontaminate equipment; and ( e) decontaminate themselves. 4.2 State Requiremeuts for Maintenance Area Drainage Control A large capacity, curbed concrete basin will be used for pesticide and fertilizer mixing and be sloped to drain to a sump system to prevent management chemicals and rinsate from escaping the area if a spill occurs. Spill response measures and supplies will be defined and available (Chapter 16-201-260 WAC; Chapter 16-229-450 WAC). Any sump contents will be recovered by manually activated pumps (Chapter 16-229-400 WAC) and properly reused, or if reuse is not possible, disposed in accordance with all applicable laws and regulations, including but not limited to the Hazardous Waste Management Act (Chapter 70.105 RCW) and the Water Pollution Control Act (Chapter 90.48 RCW). Fueling and equipment maintenance areas will be constructed so that outside drainage will be excluded from entering such areas. Fuel storage tank(s) will meet all design, maintenance, and inspection provisions required by Ecology (Chapter 173-360 WAC). An approximately 250- gallon tank of biodiesel with an electric pump for field tractors and vehicles will be located in the maintenance area, along with an approximately I 00-gallon gasoline tank and pump for equipment field vehicles. Activities in the equipment garage will include routine equipment maintenance, which may include the changing of oil, brake fluid, batteries, and antifreeze/coolant, and motor or undercarriage cleaning. Closed sump drainage will be provided September 20. 2006 A.C. KINDIG & CO. Page 19 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (IPM) and any sump contents will be pumped out manually and disposed in an approved off-site location. Washing the exteriors of sprayers, mowers, and paint machines will occur in a roofed bay with a concrete floor, draining to the sanitary sewer. Sprayers will undergo three rinses over the turf before washing in the roofed bay. This equipment will not be washed outside of the wash bay. Wastewater from the wash-down bay will not discharge into stormwater drainage facilities. 5.0 REFERENCES Personal Communications Heintzelman, D. 1998. Rhone-Poulenc Ag Company. Personal communication with Jennifer Goldsmith (Associated Earth Sciences, Inc.), July I, 1998. Ortego, L. 1998. Rhone-Poulenc Ag Company. Personal communication with Jennifer Goldsmith (Associated Earth Sciences, Inc.), July 7, 1998. Shultz, M. 1998. Zeneca Ag Company. Personal communication with Jennifer Goldsmith (Associated Earth Sciences, Inc.), August 18, 1998. References Cited Abrams, R. 1991. Toxic fairways: risking ground water contamination from pesticides on Long Island golf courses. New York Environmental Protection Bureau, New York State Department of Law, July 1991. Balogh, J.C. and W.J. Walker. 1992. Golf course management and construction: environmental issues. Lewis Publishers, 951 pp. Beard, J.B. 1973. Turfgrass: science and culture. Prentice Hall, Inc., Englewood Cliffs, New Jersey. Berndt, W.W. 1992. A best management practices development manual, turfgrass maintenance section. Prepared for Beak Consultants Incorporated, September 16, 1992. Brady, N.C. 1984. The nature and property of soils, 7th edition. MacMillan Press, New York, New York. September 20, 2006 A.C. KINDIG & CO. Page 20 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) Cohen, S.Z., S. Nickerson, R. Maxey, A. Dupay, and J.A. Senita. 1990. A groundwater monitoring study for pesticides and nitrates associated with golf courses on Cape Cod. Groundwater Monitoring Review 10: 160-173. Federal Register. July 10, 2000A. 65(132): 42472. Gustafson, D.I. 1989. Groundwater ubiquity score: a simple method for assessing pesticide leachability. Environmental Toxicology and Chemistry 8:339-357. Horsley, S. and J.A. Moser. 1990. Monitoring ground water for pesticides at a golf course-a case study on Cape Cod, Massachusetts. Groundwater Management Research, Winter 1990. King County. 1993. Best management practices for golf course development and operation. Prepared by the King County Environmental Division. Bellevue, Washington. King County. 1999. Tri-County integrated pest and vegetation management: Guidelines. http://www.metro kc. gov/hazwaste/ipm/ipmguide.htm. Oregon State University. 1996. EXTOXNET Extension toxicology network pesticide information profiles. Oregon State University OSU). 2006a. Pacific Northwest plant disease management handbook. Extension Service. Oregon State University (OSU). 2006b. Pacific Northwest weed control handbook. Extension Service. Revised Code of Washington (RCW). Chapter 15.58 RCW. Washington pesticide control act. Washington State Department of Agriculture, Olympia, Washington. Revised Code of Washington (RCW). Chapter 17.15 RCW. Integrated pest management. Washington State Department of Agriculture, Olympia, Washington. Revised Code of Washington (RCW). Chapter 17.21 RCW. Washington pesticide application act. Washington State Department of Agriculture, Olympia, Washington. Revised Code of Washington (RCW). Chapter 70.105 RCW. Hazardous waste management. Washington State Department of Agriculture, Olympia, Washington. Revised Code of Washington (RCW). Chapter 90.48 RCW. Water pollution control. Washington State Department of Agriculture, Olympia, Washington. September 20, 2006 A.C. KINDIG & CO. Page 21 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) Sygenta. 2000. Material Safety Data Sheet and Label for Primo Maxx. EPA Reg. No. 100-937. Sygenta. 2006. Material Safety Data Sheet and Label for Heritage Fungicide. EPA Reg. No. 100-1093. U.S. Environmental Protection Agency (EPA). 1998. Pesticide fact sheet for Heritage fungicide. Office of Prevention, Pesticides, and Toxic Substances, Office of Pesticide Programs. Vogue, P.A., E.A. Kerle, and J.J. Jenkins. 1994. Extension properties database. Oregon State University. Washington Administrative Code (WAC). Chapter 16-201 WAC. Fertilizer bulk storage and operational areas containment rules. Washington State Department of Agriculture, Olympia, Washington. Washington Administrative Code (WAC). Chapter 16-228 WAC. Pesticide Regulations. Washington State Department of Agriculture, Olympia, Washington. Washington Administrative Code (WAC). Chapter 16-229 WAC. Secondary and operational area containment for bulk pesticide. Washington State Department of Agriculture, Olympia, Washington. Washington Administrative Code (WAC). Chapter 173-360 WAC. Underground storage tank regulations. Washington State Department of Ecology, Olympia, Washington. Washington State University (WSU). 1980. Revised 1991. Concepts of integrated pest management: Extension Bulletin 0753. Cooperative Extension. College of Agriculture. Watershed Company, The. 1993. Fish habitat assessment and anticipated fisheries-related impacts of the proposed Blakely Ridge master plan development. Prepared for Blackhawk/Port Blakely Communities. Wauchope, R.D., T.M. Buttler, A.G. Hornsby, P.W.M. Augustijn-Beckers, and J.P. Burt. 1992. The SCSI ARS/CES pesticide properties database for environmental decision-making. Review ofEnvironmental Contamination and Toxicology 123:1-171. September 20, 2006 A..C. KJNDIG & CO. Page 22 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (!PM) APPENDIX A PESTICIDE ASSESSMENTS September 20, 2006 A.C. KINDIG & CO. Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) PESTICIDE ASSESSMENT -Chipco 26GT Category: Fungicide. Active ingredient is Iprodione (23.3%) Application Target Preventative foliar treatment fungicide recommended for the control of a large number of fungus diseases on turf. Label Recommended Application Frequency: Chipco 26GT should be applied when conditions favor disease development, or when the disease is first noted. Applications are recommended at label instructed rates as long as required. Label Recommended Application Rate: Application rate is dependent on the fungus disease. The application rate varies between 3 and 8 fl. oz per 1,000 ft2. See the label application rates for the fungus disease to be targeted. Do not apply more than 35 fl. oz per 1,000 fr per year or more than 6 applications per year. Mobility. Using the ground water ubiquity score (GUS) method of Gustafson (1989), iprodione has a "low" pesticide movement rating (Vogue et al. 1994). The GUS score includes soil half life, water solubility, and sorption coefficients as factors, and has correlated well with monitoring data once point sources of contamination are ruled out. Other investigators, the U.S. EPA and the USDA Soil Conservation Service have also attributed low mobility potential ot Iprodione (Horsley and Moser 1990, Abrams 1991). A ground water monitoring study for pesticides from golf courses over sandy deposits on Cape Cod included iprodione, but it was never detected in any of the monitoring wells (Cohen et al. 1990). Persistence· lprodione has a soil half-life of 14 to 30 days and an aquatic half life of 3 to 7 days (Heintzelman, D., personal communication, July I, 1998). These range from "very short lived" to ''moderately short lived" in classification (King County 1993). Vogue et al. (1994) and Wauchope et al. (1992) both list a soil half-life of 14 days for iprodione. Tmdcjty. The LC5096 for rainbow trout is 92.2 mg/L (Ortego, L. personal communication, July 7, 1998), which is classified as only "slightly toxic" by King County (1993) and Balogh and Walker (1992). Evaluation Summary: Based on (1) low mobility and movement ratings, (2) short-lived persistence, and (3) slight toxicity to rainbow trout, Chipco 26GT is an excellent fungicide for preventative and curative control of some of the most ubiquitous turf fungus diseases without risk of unintended environmental impact. September 20, 2006 A.C. KINDIG & CO. Page A-1 Seattle Seahawks Corporate Headquarlers and Training Facility Turf Integrated Pest Management Plan (IP M) PESTICIDE ASSESSMENT -Heritage Category: Fungicide. Active Ingredient: azoxystrobin (50%). Application Target Preventative treatment fungicide with systemic and curative properties on turf. Label Recommended Application Frequency: Heritage should be applied prior to · disease development. Applications are recommended at label instructed rates as long as required. Label Recommended Application Rate: Application rate is dependent on the fungus disease. The application rate varies between 0.2 and 0.7 fl. oz per 1,000 ft2. See the label application rates for the fungus disease to be targeted. Do not apply more than 3.7 fl. oz per 1,000 ft2 per year. Mobility: The chemical structure of azoxystrobin would suggest moderate mobility in sand and loamy sand soils. The potential mobility and persistence of some of its degradates, based on laboratory and some field studies, are similar to pesticides with known potential to leach into ground water under some conditions. For this reason the EPA placed a ground water advisory on the label. However, the EPA (1998) also notes that "upgradable, supplemental field dissipation studies indicate that Azoxystrobin was moderately immobile and relatively non-persistent under actual use conditions." Azoxystrobin has relatively low binding affinities on coarse, textured soils (loamy sand and sand), but approximately five times higher binding affinity on finer- textured soils (EPA 1998). Data supplied by !he manufacturer lists the Koc as 1,690 (Schultz, M., personal communication, 1998), which ranks as low mobility using the King County (1993) system. Using the GUS index method of Gustafson (1989), azoxystrobin has a low pesticide movement rating. The GUS score is an empirically derived value that relates sorption in soil based on the sorption coefficient (Koc) and pesticide persistence (half-life). Persistence· Azoxystrobin is stable to hydrolysis, but does photo-degrade with a half-life of 11 to 17 days in aquatic environments (EPA 1998). Photo-degradation on soil results in a half-life of 11 days. Both of these degradation rates in the presence of sunlight are characterized as short lived (King County 1993). The dissipation of azoxystrobin is mainly dependent on sunlight (photo-degradation), and secondarily dependent on microbial metabolism. In the absence of light, degradates, but not the azoxystrobin itself, could be more persistent and mobile. However, these de gradates prove to be nearly nontoxic. Toxicity: Azoxystrobin is considered highly toxic to rainbow trout (LC5096 of 0.47 mg/L) (EPA 1998; Syngenta (2006). The EPA (1998) notes that azoxystrobin is of low acute and chronic toxicity to humans, birds, mammals, and bees, but is highly toxic to freshwater fish and invertebrates. However, its degradate products are practically nontoxic to only slightly toxic to . rainbow trout and daphnids. Degradate R234886 has an LC5096 of greater than 150 ppm for rainbow trout and greater than 190 ppm for daphnids. Degradates R401553 and R402173 have LC5096 values of greater than 50 ppm to daphnids. September 20, 2006 A.C. KINDIG & CO. Page A-2 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) Evaluation Summary: Based on the relative immobility of the parent compound azoxystrobin, and the relative non-toxicity of its degradates, Heritage is environmentally safe for use on the practice fields. Restrictions to Use: • The label recommends Heritage be restricted to two applications, 28 days apart in the spring and fall for curative/preventative treatment on turf. • The label recommends that application be restricted to a 48-hour forecast of dry weather. September 20, 2006 A.C. KINDIG & CO. Page A-3 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) PESTICIDE ASSESSMENT -Primo Maxx Category. Turf growth suppressant. Active ingredient is Trinexapac-ethyl (Cyclopropyl) (11.3%). Application Target Slow the rate of turf growth and aid suppression of invasive Paa annua. Label Recommended A11plication Frequency: Multiple applications can be made as needed by local conditions of grass growth rates, but should not exceed the maximum described below. Label Recommended Application Rates· Approximately 50% growth suppression is likely to occur without grass yelJowing for 4 weeks at rates of about 0.25 to 0.50 fl. oz. I 1,000 ft2 per 4 weeks. Applications at half these rates are recommended where Paa annual control is a primary objective in order to prevent yellowing, and can be made at higher rates for brief periods durin~ periods of very rapid grass growth. Multiple applications should not exceed 7.0 fl. oz. / 1,000 ft per year. Mobility: Cyclopropyl mobility is rated as "high" with Koc values that range from 59 (sandy loam) to 629 (clay) based on data supplied by the manufacturer, Syngenta (2000). Persistence· The soil half-life for cyclopropyl at between pH 5 and 7 is 8 days in the dark and about 4 days in the light These half-lives rate as ''very short-lived" to "short-lived" persistence (King County 1993). Toxicity: The manufacturer reports an LC50!>6 for rainbow trout as 68 mg/L and greater than 142.5 mg/L for water fleas (Daphnia magna) (Syngenta 2000) . This toxicity rates as "slightly toxic" to "practicaIJy nontoxic", respectively (King County 1993). Evaluation Summary. Although highly mobile, the use of Primo MAXX for routine treatment as a growth inhibitor is an environmentally safe product for use on the practice fields due to its low persistence and slight-to non-toxicity. September 20. 2006 A.C. KINDIG & CO Page A-4 Seattle Seahawks Corporate Headquarters and Training Facility Turf Integrated Pest Management Plan (1PM) PESTICIDE ASSESSMENT: Prograss Category: Herbicide. Active ingredient ethofumesate (19%). Application Target Curative post-emergence control of annual bluegrass. Label Recommended Application Frequency: Maximum of four applications per year; two to three in the fall at 21 to 28 day intervals, and one subsequent application in the spring if needed. Label Recommended Application Rate: I .5 fl. oz per I ,000 ft 2 per application, to a maximum of four applications per treated area. Mobility: Ethofumesate has Koc values ranging from 210 for sand up to 160 for silt clay loam (U.S. EPA 1995). These would be classified as "high mobility" (King County 1993). Ethofumesate has a "moderate" pesticide movement rating using the GUS index method of Gustafson (1989) reported by Vogue et al. (1994). Persistence: Ethofumesate has a reported field dissipation half life of 2 I days (Balogh and Walker I 992). Microbial and chemical degradation accounts for 66 percent of the dissipation, and leaching accounts for 31.2 percent. Half life in sandy load soils is reported to range from 122 days to 285 days, which is highly persistent. However, Vogue et al. (1994) report a soil half life of 30 days for this product, which is more consistent with the moderately short-lived ranking from field dissipation studies. Toxjcjty: Ethofumesate has a rainbow trout LC5(m of 17.5 mg/L, which is classified as "slightly toxic" (King County 1993). Evaluation Summary: Although highly to moderately mobile, and moderately persistent, the slight toxicity of this product combined with the proposal to limit applications to greens on a curative basis combines to make it an environmentally safe element of the 1PM. September 20, 2006 A.C. KINDIG & CO. Page A-5 Appendix H Gypsy Hydraulic Project Approval Submittal CEDAROCK CONSULTANTS, INC. Environmental Consulting A.C. Kindig & Co. : N\"IR('NMt..NTAl.CC.!t\S(ll.TiNC STREAM AND LAKE STUDY SUPPLEMENTAL STREAM AND LAKE STUDY STREAM MITIGATION PLAN SEAHA WKS CORPORATE HEADQUARTERS AND TRAINING FACILITY Renton, Washington Prepared for: Football Northwest, LLC 505 Fifth Ave South, Suite 900 Seattle, Washington 98104 Prepared by: Cedarock Consultants, Inc. 19609 244th A venue NE Woodinville, Washington 98077 and A.C. Kindig & Co. 12501 Bellevue-Redmond Road, Suite 110 Bellevue, Washington 98005 September 20, 2006 19609 244" AVENUE NE· WOOOINVILLE, WA 98077 · P:425/788-0961 · F:425/788-5562 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan TABLE OF CONTENTS Page 1.0 PURPOSE ............................................................................................................................... ! 2.0 PROJECT LOCATION ......................................................................................... , .............. 1 3.0 PROJECT DESCRIPTION .................................................................................................. 2 3.1 Description of Proposed Action .................................................................................... 2 3.2 Alternatives Analysis .................................................................................................... 3 4.0 EXISTING CONDITIONS ................................................................................................... 4 4.1 Gypsy Subbasin Drainage Routing and Flow .............................................................. .4 4.2 Stream Classification .................................................................................................... 6 4.3 Physical Condition ........................................................................................................ 6 4.4 Vegetative Cover .......................................................................................................... 7 4.5 Ecological Functions ..................................................................................................... ? 4.6 Fish Use ...................................................................................................................... 11 4.7 Wildlife Use ................................................................................................................ 11 5.0 SHORELINE PLANTING/MITIGATION PLAN ........................................................... 12 5.1 Gypsy Subbasin Drainage Mitigation ........................................................................ .12 5.2 Lake Washington Shoreline Planting .......................................................................... 13 5 .3 Maintenance and Monitoring ...................................................................................... 14 6.0 RESOURCE VALUES TO BE RESTORED, CREATED, OR ENHANCED .............. 16 6.1 Habitat Improvement Opportunity .............................................................................. 16 6.2 Function and Value Comparison ................................................................................ 16 6.3 Summary ..................................................................................................................... 19 7.0 COORDINATION WITH OTHER AGENCIES ............................................................. 19 8.0 CONSTRUCTION SCHEDULE ........................................................................................ 21 9.0 SITE PROTECTION AND MAINTENANCE ................................................................. 21 10.0 ENVffiONMENTAL GOALS AND PERFORMANCE STANDARDS ...................... 21 11.0 MONITORING .................................................................................................................. 22 11.1 Sampling Methodology ............................................................................................. 22 11.2 Standards Of Success ................................................................................................ 24 12.0 CONTINGENCY PLAN ................................................................................................... 24 13.0 COST ESTIMATE ............................................................................................................. 25 14.0 COMPLIANCE WITH THE RENTON MUNICIPAL CODE ..................................... 25 14.1 Planting Location ...................................................................................................... 26 14.2 Planting Type ............................................................................................................ 26 14.3 Contiguous Corridors ................................................................................................ 26 14.4 Non-Indigenous Species ........................................................................................... 26 14.5 Equivalent or Greater Biological Functions ............................................................. 26 September 20, 2006 Seahawks/09-20.fJ6 [..Qhs Stream Report.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page i Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan Page 14.6 Minimum Planting Plan Perfonnance Standards ...................................................... 26 14.7 Based on Best Available Science .............................................................................. 27 15.0 COMPLIANCE WITH BEST AVAILABLE SCIENCE .................................... _. .......... 28 15 .I Review of the Best Available Science Supporting the Proposed Request.. .............. 28 15.2 Report Authors Experience ....................................................................................... 32 15.3 Analysis of the Likelihood of Success of the Compensation Project ....................... 32 16.0 VEGETATION PROTECTION ....................................................................................... 32 16.1 Design Considerations .............................................................................................. 32 16.2 Significant Tree Protection during Construction ...................................................... 33 17.0 REFERENCES ................................................................................................................... 34 LIST OF TABLES Table I. Plant species selected for Lake Washington shoreline .................................................... 15 Table 2. Cost Estimate Worksheet.. ............................................................................................... 25 Table 3. Riparian Habitat Functions Comparison, Existing versus Proposed Conditions ............. 29 LIST OF FIGURES Figure 1. Vicinity Map ..................................................................................................................... 2 Figure 2. Details from City of Renton Water Class Map ................................................................ 5 Figure 3. Gypsy Subbasin Drainage on-site looking upstream at beaver dam .............................. .-.5 Figure 4. Gypsy Subbasin Drainage outfall at Lake Washington .................................................... 6 Figure 5. Vegetation and woody debris along the Lake Washington shoreline .............................. 8 Figure 6. Upland vegetation looking to the west across the site from the railroad tracks ............... 8 APPENDICES Appendix 1 Plan Sets Sheet I Sheet LlOO Sheets CE301-302 Sheets CE201-202 Sheets CE22 l -224 SheetCE245 Appendix 2 Resumes of Key Personnel Site Map (source: RETEC) Conceptual Landscape Plan (source: EDAW) Gypsy Subbasin Plan and Profile (source: Crawford) TESC Plans (source: Crawford) Grading Plans (source: Crawford) Conceptual Utility & Drainage Control Plan (source: Crawford) Appendix 3 Joint Aquatic Resources Permit Application (JARP A) Form September 20, 2006 CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO. Smhawlw'09-2(}..()6 Lc;ikes Stream &port.doc Page ii Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan 1.0 PURPOSE Capping and institutional control remedial actions on the North and South Baxter site will occur under Prospective Purchaser Consent Decrees approved by the Washington Department of Ecology (Ecology) in April 2000. Remedial activities will be implemented with a goal of achieving enhanced water quality in Lake Washington. Capping of the entire site to within 25 feet of the Lake Washington shoreline requires eliminating an about 125-foot open section of the Gypsy Subbasin Drainage that is otherwise conveyed by culvert through the site. The aging and degraded culvert carrying the Gypsy Subbasin Drainage under the site will be replaced and upgraded to accommodate capacity requirements of the upstream and offsite contributing basin at buildout. To accommodate placement of the Seahawks Headquarters building (which will serve as part of the remedial cap on the site), the replacement culvert will be realigned around the building foundation. This placement will require lengthening of the pipe from the existing 490 feet to approximately 860 feet. The culvert upgrade and realignment does not include replacement of the existing outfall pipeline to Lake Washington, which will be retained in its current condition. Aside from capping required under the Consent Decrees and Feasibility Study/Cleanup Action Plans to within 25 feet of the lakeshore, project features proposed under a Master Plan approval for the site and within the Renton Shoreline Master Program jurisdiction include public access, practice fields, a building, parking, sand filters for water quality treatment, and some roadway area (see Appendix 1, Conceptual Landscape and Hardscape Plan, Sheet LlOO). All features are allowed under the Urban Environment designation afforded the project site under Renton's Shoreline Master Program. Shoreline planting will include replacement of exotic plant species with a diverse native shrub and tree riparian zone. The proposed development triggers the need for both a Standard and Supplemental Stream Study under requirements of the Renton Municipal Code (RMC) because: • The proposal will alter a waterbody (Gypsy Subbasin Drainage), and • The proposed development site contains a Shoreline of the State and associated management area. Requirements for the studies provided in this report are described in RMC 4-8-120(0). 2.0 PROJECT LOCATION The proposed project is located on approximately 19 acres at 5015 Lake Washington Boulevard North, adjacent to Lake Washington in the City of Renton, King County (Figure I). The two properties that underlie the project site are formally known as South Baxter and North Baxter. The project is located in the SWY. of Section 29, T24N, ROSE, W.M. The Gypsy Subbasin Drainage crosses the site from east to west before discharging to Lake Washington. May Creek located off-site to the south is unrelated to Gypsy Subbasin Drainage and will not be affected. September 20, 2006 Seahawh/09-20-06 Labs Slnam Report.doc CEDAROCK CONSULTANTS. INC. andA.C KINDIG & CO. Page I Seahawks Corporate Headquarters and Training Facility Renton, Washinwon 'L {,~~-;1 ;,_" '::J " < m if! ! r., ,', ., '.I) ..J > ., 7, .I / ,·· \ / _.!:;,: :~ ._ii_: i ! i ::; I .:.:_., N:..:0111Sl Figure L Vicinity Map '.~ •• ..J z Stream and Lake Studv/Mitigation Plan = !.:._; _J •--~ ,f) T •,) S[ , ill I SL UfJ Ii I :: ..J .a ·.:., ::..[ Ut: 1 ! I ST •-:r: ·~ I_ :_:,:" i l 1 ·-:, I - ~ [_ :s; '_I I i I .':_ ~ f cl I:·, 1; ~. 3.0 PROJECT DESCRIPTION 3.1 Description of Proposed Action Soils across the site to within 25 feet of the Lake Washington shoreline will be capped with up to three feet of clean soil as part of the remediation action. As part of that capping, the remaining open portion of the Gypsy Subbasin Drainage on the project site will be placed in a culvert. This action will have a direct benefit of protecting and enhancing water quality in Lake Washington. The existing Gypsy Subbasin Drainage culvert under the site is in poor condition and undersized based on a history of flooding upstream (Entranco 1995, 1997). The culvert will be replaced with a larger pipe prior to capping of the site. Portions of the pipe will be rerouted to accommodate future building and facility locations (see Appendix I, Plan Sheets CE301 and CE302). The final culvert length will be 370 feet longer than what currently exists (Magnusson Klemencic Associates, 2006). Sep/ember 20, 2006 CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO. Seuhmrk.1/09-20-IJ!i Lukes S1ream Report.doc Page 2 Seahawk.s Corporate Headquarters and Training Facility Renton, Washington Stream and lake Study/Mitigation Plan The Lake Washington shoreline area will be replanted to improve functions and values and mitigate for the lost habitat value adjacent to the Gypsy Subbasin Drainage (see Appendix I, Conceptual Landscape and Hardscape Plan, Sheet L!OO). Where native plants and large trees currently exist, they will for the most part be preserved. The dense stands of exotic blackberry and Scotch broom will be removed and replaced with native riparian species. Included within this document is the Stream Mitigation Plan. A description is provided in Section 5 and the draft plan is shown in the attached Conceptual Landscape and Hardscape Plan, (Appendix I, Sheet L!OO). Native plantings along the Lake Washington shoreline will increase functions and values of the riparian area over existing conditions and will improve the shoreline role in protecting aquatic habitat values important to Lake Washington. Net improvements in water quality, production of organic matter including insect and vegetative material, large woody debris frequency, bank stability, and wildlife habitat are predicted. More detail on the proposed riparian planting program is provided in Section 5.0. The functions and values comparison analysis is provided in Section 6. The proposed monitoring plan is provided in Section 11. The Site Map required under RMC 4-8-120(D)(l9)(a) and Grading Plan required under RMC 4- 8-120(0)(7) are attached (Appendix I, Site Map Sheet I; and Grading Plan Sheets CE221 through CE224). 3.2 Alternatives Analysis Three alternative project layouts were evaluated to avoid and minimize impacts to the Gypsy Subbasin Drainage. These included: • Daylighting the Gypsy Subbasin Drainage into an open channel across the site. • Maintaining the existing open portion of the Gypsy Subbasin Drainage m an open channel. • Passing all of Gypsy Subbasin Drainage through the site in a culvert The only available alternative to satisfy the capping requirements under the Consent Decrees is also best suited to protect fish and Lake Washington habitat. The selected alternative places all of Gypsy Subbasin Drainage passing through the property into a culvert. This conclusion is based on the following rationale: • The capping requirement under the Consent Decrees is premised on avoidance of direct contact with residual soil contamination on the property. The cap will also serve to protect water quality in the drainage and Lake Washington from potential effects due to erosion of surface soils. The capping and culvert completely isolate Gypsy Subbasin Drainage and Lake Washington from the site soils. • The on-site open section of Gypsy Subbasin Drainage is a manmade ditch well below the grade of the site with steep sideslopes. This ditch provides minimal fish habitat. Riparian function is limited by the steep rocked channel banks. Elimination of the open ditch will have water quality benefits and will not adversely affect fish habitat. • The minor loss of riparian function can be mitigated by additional planting adjacent to Lake Washington. Planting at this location will also enhance wildlife habitat by providing September 20, 2006 CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. SeahawW09-](}.()(j Laku Stream &port.doc Page 3 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan a larger block of contiguous habitat, particularly along the southern shoreline where it will abut a restored wetland and buffer adjacent to Baxter Cove. • Flow can be diverted out of the Gypsy Subbasin Drainage channel which means all culvert construction can be conducted "in the dry" after the flow is bypassed. This reduces the potential for adverse construction impacts. Because of the low quality of existing onsite habitat (described further in Section 4.0) and soils subject to required capping and institutional controls under the Consent Decrees, the proposed action will result in a net improvement in fish habitat quality in the Lake Washington Drainage. 4.0 EXISTING CONDITIONS This section provides a description of existing habitat conditions of the Gypsy Subbasin Drainage channel on the property, the associated riparian buffer, and the Lake Washington shoreline area. Known fish and wildlife uses are also described. 4.1 Gypsy Subbasin Drainage Routing and Flow The various waterways known collectively as the Gypsy Subbasin Drainages consist of a series of largely man-made pipes, ditches, ponds, and open water habitat draining an area of approximately 320 acres north of and independent of May Creek (except by flood overflow east ofl-405). The drainage collects at a single point just west of the BNSF railroad tracks west ofl- 405 before discharging to the property (Entranco 1995). The culvert under the tracks is 55 feet long, has a gradient of approximately 2 percent, and is likely a barrier to upstream fish passage. Near the property boundary but still offsite, drainage is discharged to a small (approximately 10 foot diameter), quarry-spall lined pond. From the offsite pond, flow enters a 24-inch, 46-foot long concrete culvert extending on-site and beneath a dirt haul road before daylighting again to the open channel section located on-site. The open channel is a highly confined, steep-walled ditch/trough, with a channel bed approximately 10 to 15 feet below the surrounding ground elevation and 3 to 10 feet wide at the bottom. Substrate consists primarily of a deep anaerobic mud except where bank sloughing and rocks spilled into the channel have replaced the mud with a firmer bed material. The banks are heavily vegetated with a narrow strip of young hardwoods, Scotch broom, and Himalayan blackberry. Total length of the open channel is approximately 125 feet. An approximately 4-foot high beaver dam located near the downstream end of the open channel currently backs up water upstream to the railroad tracks (Figure 3). The drainage next enters a 490-foot, 24-inch CMP which discharges directly to Lake Washington. The 490-foot CMP drops approximately 0.5 foot (0.1 % gradient) and at low lake elevation is perched about a foot above the lake water surface (Figure 4). During high lake elevations, the culvert is partially backwatered and upstream passage is possible, though not known to occur. September 20, 2006 Seohawk.JI09-204)6 LaUs Stream Repon..dm: CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page4 Seahawks Corporate Headquarters and Training Facility Renton, Washington ----Piped or cuhcn~d (dots) q' Figure 2. Details from City of Renton Water Class Map. Stream and Luke Studv!Mitigation Plan Figure 3. Gypsy Subbasin Drainage on-site looking upstream at beaver dam. Sep/ember 20, 2006 CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Sealrmd,s/09-2().(J(i Lake.I" Srri,am Repor/.dol Page 5 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and lake Studv/Mitigation Plan Figure 4. Gypsy Subbasin Drainage outfall at Lake Washington. 4.2 Stream Classification The Gypsy Subbasin Drainage on the property is shown on the City of Renton's draft Water Class Map (Figure 2) as a Class 2 water. Class 2 waters are salmonid-bearing perennial waters during years of normal rainfall. Lake Washington is a Class l water. Class l waters are salmonid-bearing perennial waters also classified as Shorelines of Statewide Significance. 4.3 Physical Condition In general, upland and aquatic habitat value of the site is low due to the disturbed nature of the former industrial areas which currently support only limited vegetation and contain residual contamination. The shoreline areas provide the highest habitat value in the project area, but the habitat value of these areas are limited due to the dominance of non-native invasive plant species, lack of vegetative diversity and structure, and lack of special habitat features such as snags. The portion of the Gypsy Subbasin Drainage on the property provides virtually no value to fish with 80 percent of the total length in a small culvert and the rest encompassed in a narrow ditch some l O to 15 feet below ground surface. The short open stretch offers some potential rearing habitat, however, habitat quality is entirely dependent on the existing beaver dam. Without the recently constructed dam, shallow depths, a muddy substrate, no instream structure, and little instream cover limits the overall habitat value. With little protection from high velocities, winter September 20. 2006 CEDAROCK CONSULTANTS, INC. andA.C. KINDIG & CO. Sealwwhi09-SJ-0(, Luke~· Strewn Rep11rt.dr1c Page 6 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan storm events would likely flush any fish from the system if they were present. Summer conditions produce extremely low flows which also severely limit habitat quality. 4.4 Vegetative Cover The project site is periodically cleared of vegetation and was last cleared in I 990. Young red alder, black cottonwood, willow, Himalayan blackberry, and Scotch broom are present on the steep banks of the Gypsy Sub basin Drainage channel. The vegetation provides good shading and a fair source of allocthonous material to the watercourse. However, water quality, bank stabilization, large woody debris input, and other functions are minimal due to the steep eroding banks, young and exotic vegetation, and a narrow functional riparian zone, because the ditch is so far below grade elevation. Lake Washington shoreline vegetation within about 20-feet of the ordinary high water mark (OHWM) is dominated by Himalayan blackberry, Scotch broom, red alder, black cottonwood, and various willow species which grow up to water's edge (Figure 5). Beyond this narrow vegetated buffer, on-site vegetation consists mainly of various grasses interspersed with small islands of trees and shrubs (Figure 6). The upland trees and shrubs are similar in character to the immediate shoreline vegetation. 4.5 Ecological Functions Ecological functions for the two areas impacted by the proposed action: the open portion of the Gypsy Subbasin Drainage on the property, and the Lake Washington shoreline, are described below along with a description of existing conditions for each function. Water Quality Vegetation adjacent to streams and lakes can improve water quality by filtering pollutants, removing nutrients, and preventing sediment introduction. Native planted areas of approximately I 00 feet in depth are normally required to preserve riparian water quality function where natural routing of water through buffers is preserved and relied upon for water quality protection. However, source control and water quality best management practices are recognized as more important for urban settings where storrnwater runoff is not reliant on riparian conditions for treatment before discharge. Because water quality treatment function is provided by the proposed developments in these cases, and not by the riparian areas, riparian depths can be much narrower. Water quality function of the existing on-site riparian areas is poor. The only vegetation adjacent to the Gypsy Subbasin Drainage and Lake Washington is relatively young (10-15 years old) and primarily exotic. There are also steep slopes adjacent to both watercourses so the normal water quality treatment process is virtually absent. Surface water runs directly across the narrow riparian areas and receives very little natural treatment. In addition, residual contamination in soils on the property can degrade water quality so flow running through the riparian buffer over such soils is not a benefit and presents a risk to aquatic species habitat. September 20, 2006 &ahawb/09-20-06 LaW Stream Report.rkc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page7 Seahawks Corporate Headquarters and Training Facility Renton, Washinston Stream and Lake Study/Mitigation Plan Figure 5. Vegetation and woody debris along the Lake Washington shoreline. Figure 6. Upland vegetation looking to the west across the site from the railroad tracks. September 20, 2006 Seulwwks/09-20-06 Lakn StJv(lm Report.doc CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO Page 8 Seahawks Corporate Headquarters and Training Facility Renton, Washington Organic Material Stream and Lake Study/Mitigation Plan Overhanging vegetation contributes leaves, vegetative litter, and small woody debris directly to the channel. This material forms the source of food for aquatic invertebrates, which are in tum eaten by fish. Terrestrial insects, another food source, also utilize riparian vegetation as habitat. The majority of material comes from directly over the stream. Function diminishes rapidly after about 25 feet from channels edge though some benefit is still realized up to about 50 feet away. Vegetation overhanging the Gypsy Subbasin Drainage provides a small amount of organic material to the watercourse. The material is carried downstream and deposited in Lake Washington where it provides some benefit to aquatic species located there as well. The young, sparse, and partially exotic composition of the buffer significantly reduces the overall value. Vegetation adjacent to Lake Washington consists predominately of exotic shrub species which overhang the water in some locations. The volume of leaf litter is minor as is the contribution of woody debris. Because many of the species are non-native and the overall shoreline area lacks diversity, the nutrient contribution and value as insect habitat is poor. Overall, the value of the existing riparian vegetation is low relative to its ability to contribute food and nutrients. Microclimate Riparian vegetation protects streams from climate changes caused by widespread development away from the stream, including soil and air temperature, humidity, and wind. There is no direct link between microclimate and the condition of salmonid habitat, however, it has been suggested that microclimate needs protection to maintain desirable assemblages of plants and animal species, including insects, beneficial to fish. It is estimated that a riparian zone between approximately 5 8 and 345 feet in the Renton area is necessary to entirely preserve natural mature forest riparian microclimates. The lack of any significant vegetation adjacent to either the Gypsy Subbasin Drainage or Lake Washington provides almost no microclimate function under existing conditions. Temperature & Shade Overhanging vegetation shades streams, until the channels become so broad that, like Lake Washington, most of the water surface is exposed to the sun. By intercepting solar radiation, vegetation prevents heat energy from reaching streams, maintaining cooler water. Vegetation also shades soil, cooling water introduced to streams through the hyporheic zone. Cool water is an essential habitat feature for salmonids, and increases the amount of atmospheric oxygen that will dissolve into the water, which also improves salmon habitat conditions and is essential for salmon spawning. Under existing conditions, 80 percent of the Gypsy Subbasin Drainage channel across the site is contained within a culvert where riparian shade has no effect on stream temperature. The open portion of the channel has a narrow riparian corridor that combined with the slope aspect of the entrenched channel, provides fair shading of the small channel. September 20, 2006 Seahawks!09-20-D6 l4lces Stream Report.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page9 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan Riparian shading of Lake Washington has no effect on water temperature due to the large size of the lake. Human Access Control One function of protected riparian zones in populated watersheds can be reducing the direct encroachment of humans including refuse dumping, trampling of vegetation, bank erosion, and noise. These function most effectively when the adjacent land use consists of low intensity development; when the riparian areas are greater than 50 feet wide and planted with high quality mixed species of native vegetation that discourages entry; and where there was a high degree of resident education on the value of the protected riparian zones. The blackberry covered slopes adjacent to the open portion of the Gypsy Subbasin Drainage and position of the channel on fenced and signed private property prohibits human access. The steep, densely vegetated Lake Washington shoreline is not conducive to human use under existing conditions. The property is currently fenced with locked gates so vegetation has no role in access control. Large Woody Debris Large woody debris (L WD) consists of downed tree stems and branches and is a functionally important structural component of stream channels in the Pacific Northwest. In non-fish-bearing stream channels such as on this project property, L WD acts as a surface for biological activity which contributes to the productivity of a stream system. In a mature coniferous forest, the majority (70 to 90 percent) of L WD in a stream comes from within 50 feet of the stream. The Gypsy Subbasin Drainage channel contains no L WD either on-or off-site. The channel is located in a relatively urban environment and intercepted repeatedly by culverts, including passage through the drainage system of the adjacent 1-405 interchange to the east of the site. Any large woody debris entering the system is removed once it works downstream and blocks a culvert. So L WD recruitment has no practical potential in this drainage. The Lake Washington shoreline contains an abundant supply of L WD that has washed up over the years. The logs come mainly from old timber log booms and escapement from milling operations rather than recruitment from along the shoreline. However, the existing shoreline on the property contains no trees large enough to provide L WD recruitment for scores of years. Channel Migration The Gypsy Subbasin Drainage channel is highly confined by culverts upstream and downstream of the property, and within a steeply sloped below-grade channel on-site. Channel migration is not possible at this location. Bank Stability Roots from vegetation growing along the streambank help stabilize soils and reduce erosion. Root strength benefits are normally low beyond 40 feet from the channel. September 20, 2006 Seahawb/09-2()...()6 Lalu Snwm, Repan.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 10 Seahawks Corporate Headquarters and Training Faciliry Renton, Washington Stream and lake Study/Mitigation Plan The existing steep banks adjacent to both sides of the Gypsy Subbasin Drainage channel on the property have poor bank stability because the channel is so far below grade, and are constantly eroding. An old road near the top of bank along the channel contributes additional sediment. The Lake Washington shoreline is slowly eroding due in part to the lack of stabilizing vegetation. Other factors such as the changing lake levels (winter and summer) managed by the Army Corps, boat wakes, and the relatively young shoreline ( due to lowering of the Lake Washington water level in 1917) also influence erosion rates. Wildlife Habitat The cleared and graded property provides little wildlife habitat though the area immediately adjacent to Lake Washington has moderate value due in part to the proximity of the lake (see Section 4. 7). The lack of a mature native canopy limits nesting and foraging habitat for most species. 4.6 Fish Use Fish use of the Gypsy Subbasin Drainage by resident salmonids is assumed. There is anecdotal evidence of fish sightings by a City of Renton street maintenance crew (Larry Fisher, personal communication, March 17, 1997). No use of the basin by anadromous salmonids is known to occur and presumed use is unlikely because of the lack of suitable habitat on the property and poor upstream passage conditions beneath the BNSF tracks and through the 1-405 interchange and roadway stormwater systems to the east. Lake Washington supports a variety of anadromous salmonids, including Chinook (Oncorhynchus tshawytscha), coho (0. kisutch), and sockeye salmon (0. nerka), and steelhead (0. mykiss) and cutthroat trout (0. c/ark1). Runs ofnon-anadromous kokanee (0. nerka) salmon are also present (King County, 1993). Lake Washington contains a wide variety of non-salmonid species, some of which are considered "warm water" species. These include both native and non- native species such as speckled dace (Rhinichthys osculus), three-spine stickleback (Gasterosteus aculeatus), northern squawfish (Ptychocheilus oregonensis), yellow perch (Perea jlavescens), black crappie (Pomoxis nigromaculatus), largemouth bass (Micropterus salmoides), smallmouth bass (Micropterus dolomiew), mountain whitefish (Prosopium williamsoni), largescale sucker (Catostomus macrocheilus), longfin smelt (Spirinchus thaleichthys), and prickly sculpin (Coitus asper) among other species (Pfeifer and Weinheimer 1992, King County 1993, Wydoski and Whitney, 1979). 4. 7 Wildlife Use Canada geese (Branta canadensis) were observed in both the vegetated and hardscape shoreline areas. The geese were observed nesting along the vegetated shoreline and in the osprey (Pandion haliaetus) nest located near the PSE substation nesting platform. Puget Sound Energy moved an osprey nest from a retired distribution pole on the Baxter site to a new nest pole platform erected on the south side of the substation in 1993. Puget Sound Energy also placed a crossbar on top of the first transmission pole leading away from the station to provide a safe place for the birds to perch. The osprey successfully nested on the new platform from 1993 until 1997 when the September 20, 2006 Seahawfa/09-10.fJ6 I.Akes Stream Report.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page II Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan osprey built a new nest at the top of the wood chip elevator located on the Barbee Mill site to the south of the property. This nest was eliminated when the mill was tom down. Osprey are present in the area from mid-March through August. Osprey have been observed hunting small mammals (likely mice) on the North Baxter site as well as fishing the lake. Canada geese and bald eagles (Haliaeetus /eucophalus) have occasionally been observed perching on the nest platform during the winter months. It is assumed the bald eagles used the perch site to forage for fish and waterfowl along the lake shoreline. Three bald eagle nest sites have been historically reported between 0.8 and 0.9 miles west and northwest of the site on Mercer Island (WDFW 2006). Two of the nest sites are not known to have been used for the last several years. The third nest was reported active in 2006. Beaver ( Castor canadensis) have been observed in wetland habitat along the lake shoreline and in Gypsy Subbasin Drainage east of the site. Pond sliders (Pseudemys scripta) · have been observed on floating logs. Red-winged blackbirds (Agelaius phoeniceus) were observed using cattail habitat in the project vicinity. Snipe (Capella gallinago) were observed in the cottonwood sapling-dominated areas. Other species of passerine birds and amphibians could be supported along the shoreline and the narrow red alder-dominated upland shoreline area. Numerous duck species also use the offshore area adjacent to the site. 5.0 SHORELINE PLANTING/MITIGATION PLAN Project actions that will affect aquatic features and adjacent shoreline vegetation include: I) Filling of the on-site portion of the Gypsy Subbasin Drainage and elimination of existing riparian vegetation on the open channel portion, 2) Lengthening of the Gypsy Su_bbasin Drainage culvert under the site, 3) Removal of structures and roadways on the site. 4) Capping of the site to within 25 feet of the Lake Washington shoreline pursuant to Consent Decree requirements, 5) Alterations to vegetation along the Lake Washington shoreline area, and 6) Construction of stormwater sand filters, five stormwater outfalls to Lake Washington, parking, fire lane, building, practice fields, and public access within the shoreline. 5.1 Gypsy Subbasin Drainage Mitigation Consent Decree requirements that include capping of the site and filling of the open portion of the Gypsy Subbasin Drainage are mitigation designed specifically to avoid human and habitat contact with surface contaminants and will improve water quality by eliminating ground/water contact in this area. This action will directly improve fish habitat in Lake Washington. No additional mitigation for the loss of 125-feet of stream channel for water quality function is warranted or proposed. Lost riparian functions from removal of vegetation adjacent to the Gypsy Subbasin Drainage channel will be mitigated by new plantings near Lake Washington contiguous with the Baxter Cove wetland protected riparian buffer. It is estimated that vegetation within approximately 15- feet of the steep ditch in which the Gypsy Subbasin Drainage is located currently provides some functional value to the watercourse in terms ofleaf litter and other organic material. To mitigate September 20, 2006 S,ahawh/09.2(} .. ()6 Laku Stream Rep<>rt.doc CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO. Page 12 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan for the loss of function of 0.09 acres of primarily exotic vegetation, approximately 0.21 acres of area adjacent to the Baxter Cover wetland mitigation site located within the 200-foot Lake Washington shoreline area will be planted with a high density tree and shrub cover. This area is currently dominated by lower-value grasses and exotic vegetation. While the culvert carrying Gypsy Subbasin Drainage is being lengthened, much of it is also being enlarged (see Magnusson Klemencic Associates 2006 for details). Because there is a fish passage barrier immediately upstream of the project site, the culvert does not currently function as an upstream fish passage conduit. If the off-site barrier is removed in the future, the longer but larger culvert under the project site is expected to provide the same or better fish passage conditions as currently found on the property. 5.2 Lake Washington Shoreline Planting The Lake Washington shoreline planting plan (see Appendix I, Sheet L 100) is being developed to enhance functions and values along the shoreline. Under existing conditions, approximately 1.23 acres of the area within I 00-feet of the Lake Washington shoreline is vegetated with exotics, upland shrubs and trees (this excludes the 0.36 acres of Baxter Cove wetland and its regulatory buffer). This area of coverage will be maintained or extended under the planting plan. In addition, virtually all existing shrubs are non-native and will be removed and replaced with native species. The area of tree canopy coverage, (0.82 acres under existing conditions) will also be matched or exceeded under the planting plan. The planting plan contains the following features important to improving habitat quality on the site: • Existing non-native and invasive vegetation will be removed from the entire site. • Existing large trees 10 inches or larger in diameter at breast height (dbh) within JOO-feet of Lake Washington have been mapped (see Appendix 1, Site Map, Sheet I) and will be preserved wherever possible consistent with site remediation and the land-use plan. • An area located within 100-feet of Lake Washington will be replanted as needed to meet or exceed existing vegetation coverage (approximately 1.23 acres) along the shoreline. • Tree canopy coverage within JOO-feet of Lake Washington (approximately 0.82 acres) will be matched or exceeded. • Planting soils will be amended if necessary to provide suitable growing conditions for new plantings. • Plantings along the shoreline will consist of a multi-layered approach consisting of groundcovers, forbs, shrubs, and tree canopy layers. • Shoreline plantings will consist entirely of native species typically found adjacent to lakes and streams within the Pacific Northwest. All plants will be selected to provide a combination of moderate to high shoreline protection and wildlife function. • Landscaping plantings selected for the project will be dominated by native species that provide moderate to high wildlife function. • All plantings will be established at a density that can reasonably be expected to thrive under the growing conditions present on the site and achieve the cover objectives within 5 to 1 0 years. September 20. 2006 Seahawh/09.]0.()6 Lakes Stream Report.doc CEDAROCK CONSULTANTS, INC. andA.C. KINDIG & CO. Page 13 Seahawks Corporate Headquarters and Training Facility Renton, Washing/on Stream and lake Study/Mitiqation Plan • Supplemental watering will be provided along the shoreline until plantings are well established and can survive on their own. • Because of the high visibility of the project, all planting, both shoreline and landscaping, will be maintained indefinitely. On-going maintenance will occur throughout the year. Dead and dying plants will be replaced as needed. Non-native species will be removed by hand. Some pruning of larger hardwood trees (rather than plant removal), particularly lower branches, may occur to facilitate shrub and groundcover growth and provide lake views from some portions of the Headquarters Building, while retaining tree canopy. The shoreline zone planting will take place on a declining slope, some of which will be graded to accommodate capping of the site, training fields, and building development upslope (see Appendix I, Sheet LIOO). A typical topsoil profile (whether existing in the non-graded area or imported in the graded fill area) will be between 12 and 18 inches. Vegetation in shoreline area will consist of native riparian species that will be selected from the list provided in Table I. Landscaping for the planting beds, parking lots, and perimeter screening will also be based almost entirely on the use of high value native vegetation and will include many of the species noted above. 5.3 Maintenance and Monitoring Operations and maintenance practices for protection and maintenance of the Lake Washington shoreline area is provided in Section 9 of this document. Monitoring is described in Section 11. September 20, 2006 Seahawh/09-21).()6 Lakes Stream &port.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 14 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and La/re Study/Mitigation Plan Table I Plant species selected for Lake Washington shoreline. Dry Zone (upland) Herbaceous Species -hydroseeded a. Deer Fem b. Pearly Everlasting c. Trailing Snowberry d. Dewey's Sedge e. Thick-headed Sedge Blechnum spicanl Anapha/is margaritacea Symphoricarpos mo/lis Carex deweyana Carex pachystachya Woody Shrubs-5' O.C. in groups of3 to 9 a. Bald Hip Rose Rosa gymnocarpa b. Evergreen Huckleberry Vaccinium ovatum c. Low Oregon Grape Mahonia nevinii d. Mock Orange Philade/phus lewisii e. Red-Flowering Currant Ribes sanguineum f. Snowberry Symphoricarpos a/bus Trees-12' O.C. a. b. C. d. Pacific Dogwood Douglas Fir Madrona Big-leaf Maple Camus nuttallii Pseudotsuga menziesii Arbutus menziesii Acer macrophyllum Wet Zone (adjacent to the shoreline) Herbaceous Species -hydroseeded a. Shortawn Foxtail b. Water Foxtail c. Slough Sedge d. Sawbreak Sedge e. Hardstem Bulrush f. Small-fruited Bulrush g. Slender Rush h. Spike Bent Grass Alopecurus aequalis Alopecurus geniculatus Carex obnupta Carex stipata &irpus acutus &irpus microcarpus Juncus tenuis Agrostis exarata Woody Shrubs-5' O.C. in groups of 3 to 9 a. Black Gooseberry Ribes /acustre b. Bog Laurel Kalmia microphylla c. Bog Rosemary Andromeda polifolia d. Hardback Spirea Spiraea douglosii e. Red Osier Dogwood C omus stolonifera Trees-12' O.C. a. Red Alder b. Black Cottonwood c. Sitka Willow A/nus rubra Populus trichocarpa Salix sitchensis (adapted from the King County Native Plant Guide and the King County, Washington -Surface Water Design Manual). September 20, 2006 Seahawi.J/09-2()..()6 lakes Stream Report.doc CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO. Page 15 Se.ahawk.s Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan 6.0 RESOURCE AND FUNCTIONAL VALUES TO BE RESTORED, CREATED, OR ENHANCED Aquatic and wildlife habitat on the site consist of a Class I lake, a Class 2 stream, and associated riparian zones. All three features have been heavily impacted by the long history of industrial land use and associated contamination at the site. To avoid direct contact to humans and preserve and protect water quality in the lake and stream, the approximately 125-foot remaining open portion of the watercourse will be culverted so that the entire Class 2 watercourse will be culverted through the· site. No further enhancements are proposed to Gypsy Subbasin Drainage. No stormwater from the developed site after capping will discharge to Gypsy Subbasin Drainage. The Lake Washington shoreline riparian planting plan focuses on restoring habitat function to a degraded area. Aquatic functions described in Section 4.5 are targeted for enhancement with the primary purpose ofimproving nutrient contribution to fisheries resources in Lake Washington and providing a higher quality wildlife habitat corridor along the shoreline. This will benefit small wildlife species including birds, amphibians, rodents, and mammals. 6.1 Habitat Improvement Opportunity Key to the restoration value of the riparian planting plan is the existing degraded condition of the Lake Washington shoreline (see description in Section 4.4). The project will not disturb or remove any significant functional benefit of the shoreline as the existing condition provides minimal value. The net change provided by the project along the shoreline will increase habitat value for both fish and wildlife. The City of Renton has designated the shoreline an Urban Environment. Urban Environments have the objective of providing for water dependent uses, including human access, along water's edge. Under the new City Shoreline Ordinance, protected riparian zones in Urban Environments are a function of how the shoreline is used and can range from O to 100 feet in width. The proposed action will match or exceed the total area of existing trees and shrubs within I 00- feet of water's edge and will create much higher habitat quality by removing exotic species and replacing them with native plants. Because much of the shoreline area currently consists of asphalt, bare dirt, and patches of exotic grass, development of various project features that will occur within the shoreline area (practice fields, building, pavement) can be completed without adversely affecting existing habitat quality. 6.2 Function and Vaine Comparison This secti.on provides a description of riparian functions and values to be provided under the proposed project action and compares each function to the existing condition described in Section 4.5. Function and value determinations are based on best available science as described in A.C. Kindig & Co and Cedarock Consultants, lnc. (2003). September 20, 1006 Stohawb/09.JO-D6 loku Stream &port.doc CEDAROCK CONSULTANTS, INC. andA.C. KINDIG & CO Page 16 Seahawks Corporate Headquarters and Training Facility Renton, Washington Water Quality Stream and Lake Study/Mitigation Plan The Consent Decree remediation requirements will benefit water quality because capping and development of the site will protect rainfall from conveying soil into Gypsy Subbasin Drainage or Lake Washington. The project stormwater management approach is based on the 2005 King County Surface Water Design Manual. Enhanced water quality treatment is proposed for site stormwater runoff (Magnusson Klemancic Associates 2006). Six stormwater management treatments are proposed to serve different developed portions of the site. The six treatment areas and systems consist of the following: Synthetic Turf Field and Building/Roof Areas ( one system) -These areas are non-pollution generating surfaces. Stormwater runoff from the synthetic turf field and building roofs will be drained to Lake Washington as direct discharge. Precipitation landing on the field will drain vertically through sand and gravel to subdrains that will convey the stormwater to a site storm drain system discharging to Lake Washington. Natural Turf Fields (one system) -Similar to the synthetic turf field, precipitation that lands on the natural turf fields will drain vertically through sand to subdrains. The natural turf fields, with an 18-inch layer of sand, will function as a large sand filter. An Integrated Pest Management (1PM) Plan will be prepared that describes turf management practices for these practice fields. One-hundred percent of storm runoff from these fields will pass through the underlying sand, which exceeds the 2005 King County Manual enhanced treatment requirement for treatment of 95 percent of storm runoff. Paved Parking and Driveways (four systems) -Stormwater runoff from paved parking and driveway areas will be treated in four large sand filters. Three of the sand filters will be covered with grass, which will intercept fines and provide pre-treatment and to help maintain the surface permeability of the filter as shown by research data (A.C. Kindig 1999). Pretreatment in the fourth large sand filter will be provided by an additional six inch top layer of sand, which will be removed and replaced once or twice annually. The large sand filters have been designed per the 2005 King County Surface Water Design Manual. Overall, the net effect of remediation and development on the property will be improvement of water quality in Lake Washington. Food The enhanced Lake Washington shoreline area is expected to provide significantly better nutrient contribution than under existing conditions due primarily to the increased presence of native species along the shoreline and the more diverse source of leaf litter and insect habitat this provides. The existing 20-foot wide swath of Himalayan blackberry and Scotch broom interspersed with a relatively sparse native tree canopy layer provides little of the normal year- round organic nutrient contribution or supply of small woody debris contributed by a native species buffer. The insect population and benthic invertebrate community is different than native fish evolved to require. Because most organic material falls vertically or is carried a short distance by wind, the region providing the greatest nutrient benefit to the aquatic environment is September 20, 2006 Seahawb/09-20--06 Laku Stream Reporl.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 17 Seahawks Corporate Headquarters am:J Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan directly over and within 50-feet of a waterbody. Therefore, the enhanced shoreline area ranging from between 20-feet to about 200-feet and averaging about 50-feet will provide an important new nutrient source and will improve habitat quality along the lakeshore. The loss of the narrow riparian buffer adjacent to the Gypsy Subbasin Drainage will slightly reduce the amount of nutrients contributed by this drainage to Lake Washington. However, the primarily exotic and relatively sparse nature of the buffer is not a significant source of material and the loss will more than be made up by proposed planting adjacent to Lake Washington. Microclimate Microclimate is a big picture climate control issue extending for up to many hundreds of feet from the lake. Neither the existing buffer nor the proposed buffer will have much effect on this habitat variable. Temperature and Shade With large lakes such as Lake Washington, shade is not a significant variable influencing water temperature. The proposed shoreline enhancements with some overhanging vegetation will provide localized shading along the shoreline and should benefit temperatures in shallow areas immediately adjacent to the shore, but the overall effect will be negligible. Placing the Gypsy Subbasin Drainage into the culvert essentially provides I 00 percent shading for this creek though the difference in water temperature being delivered to Lake Washington will be negligible. Human Access Control Urban Environment designated shoreline areas are intended to encourage human access to water's edge, though in this case access will be controlled by walkways, fencing, and perhaps some thorny native vegetation, rather than solely reliant on vegetation. The proposed shoreline area will have little function in limiting human access control in this situation. This is comparable to the existing condition where fencing rather than vegetation is used to limit access along the shoreline. Large Woody Debris Large woody debris contribution is not a significant function of riparian buffers in the urban environment due to the liability of allowing large old irees to fall randomly near densely populated areas. However, smaller woody debris can function as substrate for macroinvertebrates and as an organic nutrient source. Under the proposed enhanced shoreline area, both coniferous and deciduous trees will be planted as future sources of organic debris. Neither of these benefits would occur under the existing condition where the site is periodically graded. Channel Migration Channel migration zones are not associated with managed ditches and large managed lakes as are found on or adjacent to the property. The proposal will have no effect on channel migration. September 20, 2006 Swhawlal(J9..}~6 laku Strtam &pon.dof: CEDAROCK CONSULTANTS, INC. andA.C KINDIG & CO. Page 18 Seahawks Corporate Headquarters and Training Facility Renton, Washington Bank Stability Stream and Lake Study/Mitigation Plan The immediate shoreline will remain relatively unchanged. With the types of plants proposed for the enhanced shoreline area arrangement, and the relatively low energy lakeshore environment (relative to flowing channels), root strength in the enhanced area is expected to provide good protection of the shoreline from wind-induced waves and boat wakes. The proposal will have little effect on bank stability. Wildlife Habitat Wildlife habitat for most species will improve significantly under the proposed condition as the relatively sparse and exotic shoreline vegetation is replaced with a diverse native planting regime. Native plantings in a multi-story canopy provide a much higher wildlife habitat value especially when they are planted in large contiguous groupings and are associated with aquatic habitat as is proposed in the southwest comer of the site. Native species provide superior feeding, roosting, and nesting opportunities for birds. The resultant woody debris and herbivorous ground cover is better for amphibians, reptiles, and small rodents. The loss of riverine habitat associated with filling the 125-foot stretch of the Gypsy Subbasin Drainage will result in less habitat opportunity for species preferring moving water. But other than the beaver that has established a small dam in this system, the rip-rap lined banks and exotic species dominated shoreline does not provide good quality habitat. The proposed shoreline enhancement area along Lake Washington will improve the overall quality of habitat for most wildlife. Wetland The only wetland on the project site is in the Baxter Cove area which will remain untouched under the proposed development action. The buffer of the wetland will be altered to no less than a 40 foot width, and averaging will be used to maintain an average buffer width of 50 feet as allowed under the J.H. Baxter Property Mitigation Analysis Memorandum (Associated Earth Sciences, Inc. 2000). Uplands contiguous with the protected wetland buffer will be planted with high density tree and shrub habitat (see Appendix I, Sheet LI 00). 6.3 Summary Value for all habitat functions under the proposed development is expected to be equal to or greater than under existing conditions. This is primarily due to the relatively sparse and non- native dominated vegetation along the shoreline, and the low value of the remaining portion of the Gypsy Subbasin Drainage currently existing on the property. The quality of vegetation will increase greatly as native groundcovers, shrubs, and trees are planted and maintained. 7.0 COORDINATION WITH OTHER AGENCIES Ecology is the lead agency under the State Environmental Protection Act (SEPA) for all cleanup actions under the Prospective Purchaser Consent Decrees between the State of Washington Department of Ecology (Ecology) and the Port Quendall Company dated April 2000. The SEPA Mitigated Determination of Nonsignificance was issued on April 2000 for the capping and institutional control remedial actions to be performed under the April 2000 Feasibility Study/Cleanup Action Plan for the J.H. Baxter North Property and the April 2000 Cleanup September 20, 2006 Seahuwhf09..20-IJ6 Lohr Stream Report.doc CEDAROCK CONSULT~ INC. and A.C. KINDIG & CO. Page 19 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and lake Study!Miiigation Plan Action Plan for the J.H. Baxter South Property as required by the Consent Decrees. The Consent Decrees and Feasibility Study/Cleanup Action Plans require capping of the entire site to within 25 feet of the Lake Washington shoreline. An Engineering Design Report (EDR) for the North Baxter property and an amended EDR for the South Baxter property are under preparation for Ecology review and approval to implement the Feasibility Studies/Cleanup Action Plans. Ecology's approval of the EDR will include its determination that substantive requirements of state and local permits and approvals are met under the Consent Decrees, although implementation of Consent Decree requirements procedurally exempts these permits and approvals. These include a Hydraulic Project Approval (HPA) from Washington Department of Fish and Wildlife (WDFW) and site grading, filling, utility trenching, and building approvals from the City of Renton. A Notice of Intent to obtain a National Pollutant Discharge Elimination System (NPDES) permit for discharge of construction runoff and a Stormwater Pollution Prevention Plan for construction will be submitted to Ecology, however all storm water runoff during site construction will discharge to the sanitary sewer under a Sanitary Discharge Permit from King County Industrial Waste as required by the Consent Decrees. Discussions with the Army Corps began with a pre-application meeting on January 15, 1997 for remediation of the combined Quendall and North and South Baxter properties. During subsequent consultation, the Army Corps indicated they would decline jurisdiction over filling of the Gypsy Subbasin Drainage. Consultation to confirm the Army Corps continues to decline jurisdiction over Gypsy Subbasin Drainage alterations is being sought by the proponent. No other actions require federal approval. Ecology's approval of the EDR documents will procedurally exempt WDFW requirements for an HPA. However, the applicant met with WDFW, Ecology, and the City of Renton on August 9, 2006 to discuss preliminary plans for fill of a 125 foot section of Gypsy Subbasin Drainage pursuant to capping requirements of the Feasibility Study/Cleanup Action Plan, realigning the culvert and providing for conveyance of the Gypsy Subbasin Drainage flows through the property at full buildout of the basin upstream of the North Baxter property, construction of new stormwater outfalls to Lake Washington, and substantive mitigation requirements for the Gypsy Subbasin Drainage fill. It was agreed for the purposes of complying with WDFW's substantive requirements that a Joint Aquatic Resources Permit Application (JARPA) for the various improvements will be submitted as part of this Lakes and Streams Report for the City of Renton. This Lakes and Streams Report is a requirement of the City of Renton under its Critical Areas Ordinance for the development planned for the North and South Baxter properties. Renton must issue a Shoreline Substantial Development permit, perform SEPA review, issue a Master Plan approval, and issue other building permits for construction elements of the proposed Seahawks Corporate Headquarters and Training Facility that are not requirements of the Consent Decrees with Ecology. This Lakes and Streams Report is required to assess impacts and riparian functions and values for alterations to the Lake Washington Shoreline, and includes functional impacts and mitigation for the alteration to Gypsy Subbasin Drainage required by capping under the Consent Decrees. September 20, 2006 Stahawh/09-20.06 Lala Stream &port.doc CEDAROCK CONSULTANTS, INC. andA.C. KJNDIG & CO. Page 20 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and lake Study/Mitigation Plan 8.0 CONSTRUCTION SCHEDULE Construction is expected to begin in November of 2006 with demolition of existing structures, clearing and grubbing. Capping and grading will begin soon thereafter and be complete by June 2007. The new Gypsy Subbasin Drainage culvert will be constructed and placed into operation during the fall/early winter of 2006 and the existing open portion of channel will be filled once the new culvert is active. Building construction will begin in January 2007 and be complete by July 2008. 9.0 SITE PROTECTION AND MAINTENANCE Riparian plantings in the shoreline enhancement area and throughout the site will be monitored and maintained continuously after construction under a landscaping contract the project owner will maintain. Maintenance will proceed consistent with Ecology restrictive covenants in place after completion of cleanup activities under the Consent Decrees and will include replacement of dead and dying plants, removal of exotic plant species, watering as necessary, and trash collection. Riparian planting maintenance and monitoring will occur for 5 years after construction, but on-going maintenance will continue indefinitely as the site is maintained for the new Seahawks headquarters. 10.0 ENVIRONMENTAL GOALS, OBJECTIVES, AND PERFORMANCE STANDARDS The overall environmental goal for the Stream Mitigation/Riparian Planting Plan will be to provide a viable riparian plant community adjacent to Lake Washington that increases habitat functions and values for regional fish and wildlife. Specific functions are described in Section 4.0. More specific objectives include: • Create 53,453 square feet of vegetated shoreline area consisting almost exclusively of native plants. • Remove and control invasive and exotic plants from the site. • Eliminate water contact with surface soils. • Additional important features for the riparian planting plan are listed in Section 5.2 Monitoring will be conducted for the purpose of ensuring the plant community as designed and planted complies with these objectives. Monitoring and performance standards are described in Section I I. September 20, 2006 Seahawh/09-20-06 Lakes Stream Report.doc CEDAROCK CONSULTAN'I'S, INC. and A.C. KINDIG & CO. Page 21 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan 11.0 MONITORING The purposes of the habitat monitoring program are: (1) to ensure that design goals and objectives along with applicable pennit specifications are met; (2) to document physical and biological characteristics of the newly planted riparian shoreline area, and (3) to ensure consistency with Ecology restrictive covenants in place after the completion of cleanup activities under the Consent Decrees. The monitoring process will consist of three distinct phases: (1) construction monitoring; (2) compliance monitoring; and (3) long-term monitoring. The following sections describe elements of the monitoring program. 11.1 Sampling Methodology Monitoring of shoreline vegetation will be conducted using the techniques and procedures described below to quantify the survival, relative health and growth of plant material as well as the successful creation of an area meeting goals described in Section 10. An annual monitoring report submitted following each year of monitoring will describe and quantify the status of the riparian planting at that time. Construction Monitoring Compliance success is increased with early and frequent coordination and communication between the appropriate parties. Coordination meetings could include the fisheries biologist, landscape architect, project engineers, regulatory agency representatives, and contractors. A pre-construction meeting of personnel responsible for the design and those responsible for establishment of the riparian planting and construction along the shoreline is recommended. The purpose of the meeting will be to review the intent of the riparian planting plan, establish a pathway of communication during construction, agree upon the construction sequence, and address and resolve any questions. The landscape architect and project biologists should be present on-site as necessary to review project implementation. Duties will include: ( 1) assist in identifying and marking the limits of clearing and grading, where applicable; (2) inspect the plant materials and recommend their final placement before planting; (3) determine the correct type and application rate of amendments to the soil, if needed; (4) make adjustments in planting plans, as needed, in response to field conditions; (5) ensure that aquatic related construction activities are conducted per the approved plan and permits; and (6) resolve problems that arise during restoration, thus lessening problems that might occur later during the long-term monitoring phase. Compliance Monitoring Compliance monitoring consists of evaluating work areas immediately after planting and restoration work is completed along the shoreline. Objectives are to verify all design features September 20, 2006 Seahawh/()9.1().()6 lakes Stream &port.doc CEDAROCK CONSULTANTS, INC. ondA.C KINDIG & CO. Page22 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan have been correctly and fully implemented, and that any changes made in the field are consistent with the intent of the design. Evaluation of the planting areas will be done by the landscape architect using evaluation standards and criteria discussed below. After grading and planting of the shoreline area is complete, a walk-through survey will be completed to ensure species selection, plant location, and planting methods met all requirements of the landscape plan and any additional permitting conditions. A quantitative assessment of the plants established in the shoreline area (including plant counts and cover-abundance, as appropriate) will be recorded in representative sample plots for baseline data. This information will be used to document "time-zero" conditions from which the long- term monitoring period will begin. At each point, fixed-point photos will be taken during monitoring visits to provide physical documentation of the condition of the riparian planting areas. Photographs will be taken from all sample plot locations established during the first monitoring site visit (compliance) and thereafter each visit of the monitoring period from the established location points. The compliance monitoring phase will conclude with preparation of a compliance report from the landscape architect and project biologists. The report will verify that all design features have been correctly, fully, and successfully incorporated. Substantive changes made in the planting plans will be noted in the compliance report and on the drawings for use during the long-term monitoring phase. Information on changes should include details describing what was done, where, why, at whose request, and the result of the change. Locations of monitoring stations established for the compliance monitoring will be identified on the as-built plans. The planting plans, with the compliance report, will document "as-built" conditions at the time of construction compliance. The compliance report and as-built drawings will be submitted to the City of Renton· and Ecology. Long-term Monitoring Long-term monitoring will begin after acceptance of the compliance report by the City of Renton and will be conducted for five growing seasons. Monitoring will evaluate establishment and maintenance of plants in the shoreline area to determine if goals and objectives of the mitigation/riparian planting plan have been met. Monitoring will be conducted annually each year during the five-year monitoring period. A final site check and summary report will be prepared in the fifth year of monitoring. At each sample station, plant species will be identified, individual shrubs and trees counted (where appropriate) to document surviv!ll, and an estimate of cover and abundance made using commonly accepted methods. The plantings will be examined to document survival rate of each species planted, signs of stress, damage, or disease as well as signs of vigor, and rates of colonization by other plants. Special attention will be paid to species considered to be exotic or invasive (e.g., reed canarygrass, Himalayan blackberry, Scotch broom). September 20, 2006 Seahawb/{}9-20--06 Latu Stream RtporLdoc CEDAROCK CONSULTANTS, INC. andA.C KINDIG & CO. Page 23 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan All wildlife observed during the monitoring will be recorded, with notes made regarding habitat use patterns and activities. Any evidence of breeding or nesting activities will be noted. Monitoring reports will be prepared for submittal to the City of Renton and Ecology at the end of each monitoring year. The monitoring report will document the changes occurring within the mitigation/riparian planting areas and make recommendations for improving the degree of success or correcting any problems noted during monitoring. Monitoring reports will document how the riparian planting is meeting the goals and objectives of the plan. 11.2 Standards Of Success Success standards for the Lake Washington riparian shoreline area are relatively simple and straightforward due to the absence of complicated hydrologic regimes. Of primary concern is ensuring the establishment and viability of a functional plant community dominated by native species. As such, mitigation/riparian planting success will be determined if the following goals are met: • A total of 53,453 square feet of mitigation/riparian planting is present within I 00-feet of the Lake Washington shoreline and 9,005 square feet of mitigation planting is present between 100 and 200 feet of the Lake Washington shoreline. • Within the mitigation/riparian planting area there is.ninety-five (95) percent survival after Year I, ninety (90) percent survival after Year 3, and eighty (80) percent survival for all planted woody vegetation (shrubs and trees) at the end of Year 5. • Within the mitigation/riparian area there is not more than 2 percent cover of non-native invasive species at the end of each year. • No significant areas of erosion ( defined as shoreline material loss of greater than one cubic yard) will occur along the Lake Washington shoreline. Volunteer native, non-invasive species will be included as acceptable components of the mitigation if they are thriving at the end of Year 5. 12.0 CONTINGENCY PLAN If monitoring results indicate any performance standards are not being met, it may be necessary to implement all or part of a contingency plan. Such plans are prepared on a case-by-case basis to reflect failed mitigation characteristics. A contingency plan would be developed based on a specific failure to meet success standards described in Section 11.2 of this plan. The contingency plan could include recommendations for additional plant installation, erosion control, modifications to the watering regime, and plant substitutions including type, size, and location, consistent with Ecology restrictive covenants in place after the completion of cleanup activities under the Consent Decrees. City and Ecology approval would be requested before implementation of the plan. September 20, 2006 Simhawb/09-2().{}6 LDw Stream Report.doc CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO. Page24 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan Contingency/maintenance activities may include: • Replacing plants lost to vandalism, drought, or disease, as necessary. • Replacing any plant species with a 20 percent or greater mortality rate with a similar species approved by the City. • Irrigating certain areas only as necessary during dry weather if plants appear to be too dry, with a minimal quantity of water. • Reseeding the shoreline riparian planting area with an approved grass mixture as necessary if erosion/sedimentation occurs. • Removing all trash or undesirable debris from the wetland and planting areas as necessary. 13.0 MITIGATION/RIPARIAN PLANTING COST ESTIMATE Table 2 Cost Estimate Worksheet1 Items Units llnit Cost Total Trees 134 $50 ea $6,700 Large shrubs 1,274 $30 ea $38,211 . Small shrubs 1,330 $17.50 ea $23,275 Native grass 26,144 $1.25 sq.ft. $32,680 Irrigation 52,289 $1 foot $52,289 Fine grading 52,289 $0.25 sq.ft. $13,072 Topsoil 1,292 $26 cu.yd $33,592 Mobilization I $24,768 ea $24,768 Landscape architect oversight 100 $100/hr $10,000 Maintenance 5 $3,000 year $15,000 Monitoring 5 . $2,000 year $10,000 Base Cost -$259,587 3 0% Contingency -$77,876 . Total Cost-$337,463 ' Based on September 8, 2006 planting plan prepared by EDAW. September 20, 2006 Seahawks/()9-20--06 LaW Stream ReporLdoc CEDAROCK CONSULT ANTS. INC. and A. C. KINDIG & CO. Page 25 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan 14.0 COMPLIANCE WITH THE RENTON MUNICIPAL CODE RMC 4-3-050 L(3)(c)(ii) provides criteria for approval ofa Stream and Lake Mitigation/Riparian Planting Plan. This section discusses how the conceptual plan meets those requirements. 14.1 Mitigation Location Mitigation for all proposed environmental impacts will take place on-site as recommended as the preferred mitigation location under the RMC. 14.2 Mitigation Type Proposed mitigation/riparin planting consists of several of the preferred options under subsection L3c(ii)(b). These include a net reduction in impervious surface from the Lake Washington shoreline area, improving biological functions of the shoreline, increasing native planting along the shoreline (which is a recommended watershed improvement), and improving water quality in Lake Washington. There are no options to daylight streams or remove manmade salmonid migration barriers within the project site, however, the larger culvert being provided under the site may improve fish migration characteristics somewhat. As demonstrated in Section 6.2 of this report, the riparian planting provides for equivalent or greater biological functions of the Lake Washington shoreline. 14.3 Contiguous Corridors All riparian planting has been located to preserve or achieve contiguous riparian and wildlife corridors to the greatest extent practicable along the Lake Washington shoreline. All proposed riparian planting consists of one contiguous habitat corridor along the shoreline. 14.4 Non-Indigenous Species No non-indigenous plant, wildlife, or fish species shall be introduced. All species to be utilized for riparian planting are native species selected to provide a combination of moderate to high aquatic protection and wildlife function. 14.5 Equivalent or Greater Biological Functions Existing and proposed ecological functions of on-site riparian habitat is discussed in Section 6.2 of this report. Compliance with best available science is discussed in Section 15.0. The evaluation of functions and values found a net gain in riparian habitat quality. 14.6 Minimum Mitigation/Riparian Planting Plan Performance Standards RMC 4-3-050 F(8) contains additional mitigation requirements which the applicant must meet. The applicant shall: • Demonstrate sufficient scientific expertise, the supervisory capability, and the financial resources to carry out the mitigation project. To this end the applicant has contracted with EDA W Seattle to provide the riparian planting landscape design. The plan was reviewed for functional benefit to the aquatic environment by Cedarock Consultants, Inc. Both firms have September 20, 2006 Stahawb/09-2(}.()6 LaUs Stnam Report.doc CEDAROCK CONSULTANTS, INC. andA.C. KINDIG & CO. Page 26 Seahawks Corporate Headquarters and Training Facili'fy Renton, Washington Stream and lake Study/Mitigation Plan extensive experience designing, supervising construction, and monitoring results of riparian planting projects. Resumes of key personnel are provided in Appendix 4. The applicant, Football Northwest, LLC, is a large established company with substantial financial resources. • Demonstrate the capability for monitoring the site and to make corrections during the monitoring period if the mitigation project fails to meet projected goals. Monitoring for this project is relatively simple. No complicated wetland, hydro logic, or fish surveys are required. All corrections will consist of replacement of dead and dying plants as necessary and possible minor repairs to infrastructure (fences, signs, etc.) and the shoreline along Lake Washington. • Protect and manage. or provide for the protection and management. of the mitigation area to avoid further development or degradation and to provide for long-term persistence of the mitigation area. The applicant is developing the project as their future headquarters and will be located on-site. They have a vested interest in maintaining the vegetation in excellent condition as it will be visible from the headquarters building and practice facilities. • Provide for project monitoring and allow City inspections. The applicant will contract with a consultant to monitor all the shoreline planted areas. City inspections will be allowed. • Avoid mitigation proposals that would result in additional future mitigation or regulatory requirements for adjacent properties, unless it is a result of a code requirement. or no other option is feasible or practical. The proposed riparian planting does not move the location of any natural feature towards adjacent properties. Thus no off-site property owners will be affected. • For on-site or off-site mitigation proposals. abutting or adjacent property owners shall be notified when wetland creation or restoration. stream relocation, critical area buffer increases, flood hazard mitigation, habitat conservation mitigation. or geologic hazard mitigation have the potential to considerably decrease the development potential of abutting or adjacent properties. For example, if a created wetland on a property would now result in a wetland buffer intruding onto a neighboring property, the neighboring property owner would be notified. The development potential of abutting or adjacent property owners will not be affected in any way by the proposed shoreline planting plan for this project. 14. 7 Based on Best Available Science Compliance with best available science is described in Section 15.0. September 20, 2006 Seohawks/09-20-()6 lakes Stream Report.doc CEDAROCK CONSULTANTS, INC. and A. C. KINDIG & CO. Page 27 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lalre Study/Mitigation Plan 15.0 COMPLIANCE WITH BEST AVAILABLE SCIENCE 15.1 Review of the Best Available Science Supporting the Proposed Request Mitigation plantings proposed for the Lake Washington shoreline are both wider and better vegetated than under existing conditions. Functions and values of both aquatic and upland riparian habitat will be improved over existing conditions based on wider buffers, native species plantings, and water quality improvements. A summary of proposed riparian functions in comparison to existing riparian functions is provided in Table 3. Riparian areas are generally recognized as having four major elements necessary to protect the . aquatic environment: • Maintenance of stream baseflows; • Maintenance of water quality; • Contribution to in-stream structural diversity; and • Contribution of biotic input including insects and organic matter. Best Available Science (BAS) is unanimous in its recognition that wider riparian areas provide increasing value to aquatic habitat (Pollock and Kennard 1998). Since the relationship between riparian width and riparian function is exponential, the incremental functional benefits of increasing riparian width decreases as buffers become wider. Under proposed conditions for Lake Washington, the riparian planting area will range from a minimum of about 20 feet to a maximum of about 200 feet (horizontal distance). Because the planted area will be wider than under current conditions, and because species quality, quantity, and diversity along the shoreline will be improved over existing conditions, the proposal is consistent with the RMC requirement to utilize BAS to improve water quality, fish, and wildlife habitat. As described below using BAS, the proposal will create a functional riparian corridor fully capable of protecting the major habitat elements. Baseflow The proposed shoreline area will have no effect on baseflow because of the size of Lake Washington and its position at the downstream end of the watershed. Water levels in Lake Washington are not controlled within the immediate riparian zone of the lake. September 20. 2006 Seahawb/09-20-06 Lala Strmm Rqxn1.doc CEDAR<XKCONSULTANTS, INC. andA.C. KINDIG & CO. Page28 Seahawks Corporate Headquarters and Training Facility Renton, Washington Table 3 Stream and Lake Study/Mitigation Plan Riparian Habitat Functions and Values, Comparison of Existing versus Proposed Conditions function Habitat Potential Existing Shoreline Proposed Shoreline Habitat Value Function for Class Conditions Conditions Comparison I Lakes Water Quality Low to Existing condition lacks Future development is not Eguivalent Moderate width, plant density, and plant dependant on riparian function under diversity. Lack of native function for water quality both conditions vegetation also a minus. because it employs the 2005 King County Surface Water Design Manual, so width for water quality treatment is not required. Native vegetation is a plus. Food Low Sparse non-native vegetation Vegetation optimized with ProJ!:2sed action provides little beneficial leaf a diverse mix of native will have higher litter and small organic species. High habitat value value debris. near lake. Microclimate Low to Existing shoreline area has Proposed shoreline area Eguivalent Moderate little effect on microclimate. will have little effect on function under microclimate. both conditions Temperature Low to Not a significant issue for Not a significant issue for Eguivalent & Shade none large Class I waterbodies. large Class I waterbodies. function under both conditions Human Low Lake Washington is a public Lake Washington is a Eguivalent Access access area so access control public access area so access function under not a habitat function issue control not a habitat both conditions function issue Large Woody Low Site periodically cleared so Planting that will contribute Pro12osed action Debris unlikely to have any some minor woody debris will have higher significant future L WD in the future. value contribution. Channel Low Controlled lake level and no Controlled lake level and Eguivalent Migration surface channels on-site. No no surface channels on-site. function under potential for channel No potential for channel both conditions migration migration Bank Stability Low to Exotic species dominated Root strength increased Prol!Qsed action Moderate shoreline. Banks partially with native shrubs and will have higher protected by large logs. trees. Banks partially value protected by large logs. Wildlife Not Rated Patchy exotic species Native plantings in a dense Prol!Qsed action Habitat dominated riparian vegetation multi-story contiguous will have highest of relatively low value as canopy will provide high value bird, amphibian, reptile, and wildlife habitat value. rodent habitat. Adapted from: A.C. Kindig & Co and Cedarock Consultants, Inc. 2003. September 20, 2006 Seahawks/()9-2()..()6 La!u S1ream Report.doc . CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 29 Seahawks Corporate Headquarters and Training Facility Renton, Washington Water Quality Stream and Lake Study/Mitigation Plan Water quality as it relates to aquatic habitat consists of various components including chemistry (pH, D.O., metals, etc.) and temperature (the beneficial dissolved and particulate organic nutrients that are also a component of water quality are discussed in the Biotic Input section). Water Chemistry Riparian widths ranging from 30 to I 00 feet are described in the literature as satisfactory for removing the majority of sediment and pollutants from surface water (summarized in Knutson and Naef 1997). However, under the current conditions, on-site natural pathways to the stream are largely absent due to the flat nature of the site and the isolated steely banked below-grade channel. Under the proposal, the site will continue to avoid discharge to Gypsy Subbasin Drainage because the hydrologic flow path through the site will be a piped drainage systems that will bypass the riparian area and convey offsite discharge directly to Lake Washington. For Lake Washington, sheet flow drainage that occurred in the past will be intercepted and treated as required by the 2005 King County Surface Water Design Manual before discharge at outfalls constructed to Lake Washington. Much of the natural riparian functions for hydrologic and water quality functions (peak flow attenuation, base flow releases, and water quality treatment) will be removed from riparian area control by the storm drain system. Storm water detention and water quality treatment requirements are regulated for new development and redevelopment within the City without reliance on riparian buffer function. The proposed riparian zones will provide equivalent water chemistry protection as existing riparian areas, and remediation including site capping and fill of the remaining portion of the Gypsy Subbasin Drainage will result in overall water quality improvements. Temperature and Shade Stream riparian zones provide shade and absorb solar radiation that would otherwise reach streams and increase water temperatures. For these reasons, shade provided by riparian zones can be important to maintaining water temperatures that are favorable for salmonids. However, research on the effects of shade on stream water temperatures shows a considerable amount of variability based on topographic elevation, adjacent land uses, vegetation type, and numerous other factors (Pollack and Kennard 1998). Sullivan et al. (1990) concluded that once streams traveled 25 miles from their watershed divides, they were generally too wide for trees to shade their surfaces or exercise control over water temperature. This is particularly true in large, deep lakes like Lake Washington. The proposed shoreline area will provide equivalent water temperature protection as the existing riparian zone. lnstream Structural Diversity In-stream structural diversity is provided by large pieces of wood falling into the waterbody .. Large woody debris (L WD) consists of downed tree stems and branches and is a functionally important structural component of stream channels and lakes in the Pacific Northwest (Bisson et al. 1987, Beschta et al. 1987, Sullivan et al. 1987, Bilby and Ward 1991, Fetherston et al. 1995, Naiman and Beechie 1992). September 20, 2006 S«Jhawb/09-10-M Latu Stream Report.doc CEDAROCK CONSULTANTS, INC and A.C. KINDIG & CO. · Page 30 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and lake Study/Mitigation Plan The existing riparian zone contains no trees that would potentially contribute L WD to the lake, in part because the site is periodically cleared. Under the proposed shoreline area, conifers capable of reaching the size necessary to function as L WD will eventually grow to maturity and senesce. Some of these trees will fall into Lake Washington and increase structural diversity. To help protect the shoreline from erosion, the applicant has proposed adding a few pieces of L WD to the shoreline. This will contribute to L WD accumulation in the area and provide some immediate benefit. The proposed shoreline area will improve habitat quality provided by L WD over existing conditions. Biotic Input Vegetation and insects falling into the creek form an important component of the aquatic ecosystem food chain, especially in smaller stream channels. The majority of material comes from directly over, or within a very short distance of the stream. FEMAT (1993) suggests most leaf material is contributed by trees located within approximately 50 feet of the channel edge. Under existing conditions there is very little biotic input to the creek. Vegetation is generally sparse and non-native. With the proposed future riparian shoreline area being wider, more diverse, and consisting almost entirely of native species, the contribution of vegetative litter and insect population abundance should increase significantly. The proposed shoreline area will increase biotic input over existing conditions. Noise and Visual Disturbance Riparian zones protect sensitive areas from direct human impact by limiting easy access to the stream and by blocking the transmittal of human and mechanical noise. Riparian zones provide visual separation between streams and the developed environment, blocking glare and human movement from fish species (Young 1989). Riparian zones function most effectively when the adjacent land use consists of low intensity development; when riparian areas were greater than 50 feet wide, and planted with high quality mixed species of native vegetation that discourage intrusion (Cooke 1992). Other authors recommend controlled human activity within riparian zones, such as restricting human disturbance to footpaths, or roadway crossings within 25 feet of the stream, and allowing active recreation and bike paths within 25 to 50 feet of the stream (Schueler 1995). However, the City of Renton has designated the portion of Lake Washington in which the project is located as an Urban Environment under its Shoreline Master Program where human recreational activities are to be encouraged. Therefore, the shoreline area is not being designed to function as a division between the lake environment and controlled human use. The proposed shoreline area will provide equivalent disturbance protection as existing riparian areas. September 20, 2006 Seohawb/09-2()..()6 laku Srream Report.~c CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 31 Seahawks Corporate Headquarters and Training Facility Renton, Washington 15.2 Report Authors Experience Stream and Lake Study/Mitigation Plan The applicant has contracted with EDA W to provide riparian planting design and with A.C. Kindig & Co., which included Cedarock Consultants in the biological analysis for the project. These firms have extensive experience with riparian planting design, construction supervision, and long term project success monitoring. Resumes of key personnel are provided in Appendix 4. 15.3 Analysis of the Likelihood of Success of the Compensation Project The proposed mitigation/riparian planting project is relatively straightforward and will benefit from having the applicant situate their headquarters on the site. The development is a high profile project expected to receive extensive and ongoing media coverage. With the .Seahawk's headquarters on-site and the playing fields and players lounge immediately adjacent to the mitigation/riparian planting area, it is in the applicant's best interest to provide long term maintenance of the riparian plantings beyond what might normally be provided for a similar project where the site is sold and the developer leaves. There are no fish habitat or high quality wetlands involved in the riparian planting project. Riparian planting consists primarily of planting native species in good quality riparian soils. The area is watered naturally throughout most of the year and supplemental watering will be provided as necessary. Upland plants will be selected that have adapted to the normal Pacific Northwest wet winter and dry summer seasons. The mitigation/riparian planting site will be monitored for five years to ensure plant species selected and utilized for the project are thriving. Those that are not in satisfactory condition during this period will be replaced. After five years, all healthy plants are expected to continue growing without additional maintenance. However, maintenance will continue as needed to remove debris and replace dead specimens, and manage understory branches of selected hardwood trees. Overall, the likelihood of success for the riparian planting project is considered to be high. 16.0 VEGETATION PROTECTION 16.1 Design Considerations The Consent Decrees and Feasibility Study/Cleanup Action Plans require capping of the North and South Baxter properties to within 25 feet of the Lake Washington shoreline. This will necessitate removal of all existing vegetation under the capped area. The site was last cleared in 1990, so existing vegetation consists predominately of grass, shrubs, and young trees. The largest existing trees consist of8 to IO-inch diameter cottonwood which are found within 25-feet of the shoreline. These trees will for the most part be preserved except where slopes necessary for grading will bury the rootballs. September 20, 2006 Seahawb/09--20--06 lakes Stmmr Report.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 32 Seahawks Corporate Headquarters and Training Facility Renton, Washington 16.2 Significant Tree Protection during Construction Stream and Lake Study/Mitigation Plan As noted previously, all existing trees will be removed from the site as necessary for capping except those found within approximately 15 to 25-feet of the shoreline. Within this area, Himalayan blackberry and Scotch broom form dense thickets which have to be removed to accommodate conversion to a native landscape under the shoreline riparian planting plan. The following measures will be implemented during construction to protect significant trees found along the shoreline while all other vegetation is removed: • All significant trees on the project site within I 00 feet of the shoreline will be identified and located (see Appendix 1, Site Map (Sheet!), for 10 inch and larger trees). • Prior to clearing, all trees to be retained shall be flagged. • Prior to grading and throughout construction, a temporary plastic net fence shall be used to identify the protected area of any significant tree designed for retention. The height of such fencing shall be adjusted according to the topographic and vegetative conditions of the site to provide clear visual delineation of the protected area. The size of the protected area around the tree shall be equal to one foot diameter for each inch of tree trunk diameter measured four feet above the ground. • At no time during construction shall the following be permitted within the significant tree protection area: (a) impervious surfaces, fill, excavation, or storage of construction materials; (b) grade level changes, except in limited circumstances where proposed improvements are determined by an arborist to be non-detrimental to the tree root systems. September 20, 2006 Sealtawb/09-20-()6 Lakes Stream Report.doc CEDAROCK CONSULTANTS. INC. andA.C. KINDIG & CO. Page 33 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan 17.0 REFERENCES A.C. Kindig 1999. Sand Filter Turf Cover Testing, in Chapter 5, MountainStar Master Planned Resort EIS Water Quality and Fisheries (Associated Earth Sciences, Inc.), June 30, 1999. A.C. Kindig & Co and Cedarock Consultants, Inc. 2003. Best available science literature review and stream buffer recommendations. Consultant report prepared for the City ofRenton. February 27, 2003. Associated Earth Sciences, Inc. 2000. An Addendum to the Quendall and Baxter Properties Mitigation Analysis Memorandum dated February 17, 2000. J.H. Baxter Propety Mitigation Analysis Memorandum. October 2, 2000. Beschta, R.L., Bilby, R.E., Brown, G.W., Holtby, L.B., and T.D. Hofstra. 1987. Stream temperature and aquatic habitat: Fisheries and forestry interactions. In Salo, E.O and T.W. Cundy [eds.] Streamside Management: Forestry and Fishery Interactions. University of Washington, College of Forest Resources, Seattle, Washington. 47lp. Bilby, R.E. and J. W. Ward. 1991. Characteristics and function of large woody debris in streams draining old growth, clear-cut, and second growth forests of southwestern Washington. Can. J. of Fish. Aquat. Sci., 48:1-10. Bisson, P.A. Bilby, R.E. Bryant, M.D. Dolloff, C.A., Grette, G.B., House, R.A. Murphy, M.L., Koski, K.V. and J.R. Sedell. 1987, p. 87-94. In Salo, E.O and T.W. Cundy [eds.] Streamside Management: Forestry and Fishery Interactions. University of Washington, College of Forest Resources, Seattle, Washington. 471p. Cooke, S.S. 1992. Wetland buffers-a field evaluation of buffer effectiveness in Puget Sound. Pentec Environmental, Inc. Prepared for Washington Department of Ecology Shorelands and Coastal Zone Management Program, Olympia Washington. Entranco. 1995. Gypsy Subbasin Analysis. Technical Memorandum No. 2. City of Renton. April 1995. Entranco. 1997. Gypsy Subbasin Drainage Improvements Design Memorandum. City of Renton, September 1997. Federal Ecosystem Management Assessment Team (FEMAT) 1993. Aquatic ecosystem assessment, Volume 5. Fetherston, K.L., R.J. Naiman, and R.E. Bilby. 1995. Large woody debris, physical process, and riparian forest development in montane river networks of the Pacific Northwest. Geomorphology 13:133-144. King County. 1993. Sammamish River corridor conditions and enhancement opportunities. King County Surface Water Management, Seattle, WA. 54 p. plus appendices. Knutson, K. L. and V. L. Naef. 1997. Management recommendations for Washington's priority · habitats: riparian. Washington Department of Fish and Wildlife, Olympia, WA. 181p. September 20, 2006 Seahaw/c:sl09-2().(}6 Lakes Stream Reptm.doc CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 34 Seahawks Corporate Headquarters 'and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan Magnusson Klemancic Associates, 2006. Stormwater Technical Information. Seahawks Headquarters and Training Facility Renton, Washington. August 24, 2006. Naiman, R.J., T.J. Beechie, et al. 1992. Fundamental elements of ecologically healthy watersheds in the Pacific Northwest coastal ecoregion. Pages 127-188 In R.J. Naiman, editor. Watershed management: balancing sustainability and environmental change. Springer-Verlag, New York. pp. 127-188. Pfeifer, B. and J. Weinheimer. 1992. Fisheries investigations of Lakes Washingt_on and Sammamish, 1980-1990. VI Warmwater fish in Lakes Washington and Sammamish (draft report). Washington Department of Fish and Wildlife, Olympia, WA. Pollock, M. and P.M. Kennard. 1998. A low-risk strategy for preserving riparian buffers needed to protect and restore salmonid habitat in forested watersheds of Washington State: Version I.I. 10,000 Years Institute: Bainbridge Island, Washington. Schueler, Y. 1995. Site planning for urban stream protection, Washington D.C., Metropolitan Washington Council of Governments and the Center for Watershed Protection. Sullivan, K. J. Tooley, K. Doughty, J.E. Caldwell, P. Knudsen. 1990. Evaluation of prediction models and characterization of stream temperature regimes in Washington. Timber/Fish/Wildlife Report TFW-WQ3-90-006, Washington Department of Natural Resources, Olympia, Washington. Sullivan, K., Lisle, T.E., Dolloff, C.A., Grant, G.E. and L.M. Reid. 1987. Stream channels: The link between forests and fishes, p. 143-190. In Salo, E.O and T.W. Cundy [eds.] Streamside Management: Forestry and Fishery Interactions. University of Washington, College of Forest Resources, Seattle, Washington. 471p. Washington Department of Fish and Wildlife (WDFW). 2006. Priority habitats and species database search (T24N, ROSE, S29). August 18, 2006. Olympia, Washington. Wydoski, R.S. and R.R. Whitney. 1979. Inland fishes of Washington. University of Washington Press, Seattle, WA. 220 p. Young, M.J. 1989. Buffer delineation method for urban palustrine wetlands in the Puget Sound Region. M.S. Thesis, University of Washington, Seattle. September 20, 2006 SeahawJa/09-20-06 lokes Sire.am Repcrt.dvc CEDAROCK CONSULTANTS, INC. and A.C. KJNDIG & CO. Page 35 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan • Sheet I • Sheet LIOO • Sheet Sheets CE201-202 • Sheets CE22 l-224 • SheetCE245 • Sheets CE301-302 September 20, 2006 Seahawh/09-20-06 Lales Srream Report.doc APPENDIX 1 PLAN SETS Site Map (source: RETEC) Conceptual Landscape Plan (source: EDA W) TESC Plans (source: Crawford) Grading Plans (source: Crawford) Conceptual Utility & Drainage Control Plan (source: Crawford) Gypsy Subbasin Plan and Profile (source: Crawford) CEDAROCK CONSULTANIS, INC. andA.C KINDIG & CO. Page 36 Seahawks Corporate Head£j_uarters and Training Facility Renton, Washington Stream and lake Study/Mitigation Plan APPENDIX2 RESUMES FOR KEY PLANTING PLAN DESIGN AND AQUATIC/WILDLIFE FUNCTION ANALYSIS CONSULTANTS September 20, 2006 Seahawh!Ofl-20-()6 UJkes Slreom Report.doc CEDAROCK CONSULTANTS, INC. and A.G. KINDIG & CO. Page 37 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan CARL G. HADLEY Principal Fisheries Biologist -Cedarock Consultants, Inc. EDUCATION B.A., Ecology University of California at San Diego MS. Graduate Studies, Fisheries University of California at Davis PROFESSIONAL REGISTRATIONS Washington Department of Natural Resources Watershed Analysis Analyst/Specialist Fisheries, Channel and Water Quality Modules In.stream Flow Physical Habitat Simulation (PHABSIM) Modeling Course NAU/ and PAD/, Open Water Scuba PROFESSIONAL ASSOCIATIONS American Fisheries Society American Fisheries Society· Bioengineering Group SUMMARY Mr. Hadley provides over 15 years of experience in assessing and mitigating land development project impacts on aquatic habitat. Mr. Hadley has been the principal fisheries scientist on several dozen Environmental Impact Studies .under SEP A/NEPA. Much of Mr. Hadley's current practice specializes in working with clients with exposure to fisheries resources impacted by the Federal and · State threatened and endangered species programs. Past experience has included field analysis and authorship of fisheries modules for over a dozen Washington State DNR level 2 watershed analyses, a half dozen Habitat Conservation Plans for incidental take permits under Section IO of the federal Endangered Species Act (ESA ), and several dozen Biological Evaluations and Biological Assessments for consultation under Section 7 of the ESA. Mr. Hadley has also provided design, permitting, and construction oversight on several dozen urban and rural stream enhancement and restoration programs. REPRESENTATIVE PROFESSIONAL EXPERIENCE CRITICAL AREAS ORDINANCE DEVELOPMENT City of Renton Hired by the City of Renton to provide fisheries biology expertise to the City during development of their new Critical Areas Ordinance and Shoreline Master Program regulations. Developed best management practices for stream, lake and riparian habitat based on Best Available Science review. Worked with Department of Ecology and City to ensure new regulations met Growth Management Act (GMA) requirements. WATERCOURSE MANAGEMENT PROJECTS Skagit County Department of Public Works, Washington Provided permitting and mitigation design assistance in support of various projects designed to alleviate flooding and enhance fisheries use offarm-related watercourses in Skagit Valley. Designed stream habitat restoration features, fish passage structures, and riparian planting schemes. Prepared permit applications and supporting documents (JARPAs, Biological Assessments, etc.) as needed for local, state, and federal permits. SNOQUALMIE RIDGE PROJECT Weyerhaeuser Real Estate Company Prepared fisheries sections for the Master Drainage Plan and multiple EISs. Assessed salmonid fisheries habitat in 21 drainage basins on the 2,000-acre development site. Evaluated project impacts on each stream and provided design input for fisheries mitigation. Conducted long-term monitoring studies to evaluate construction and land-use change impacts and develop appropriate responses based on adaptive management concepts. TREEMONT RESIDENTIAL DEVELOPMENT Port Blakely Communities, Prepared fisheries sections for Environmental Impact Statement. Developed and implemented fisheries study plan to support a King County EIS and Master Development Plan. Assessed impacts to fisheries and developed appropriate miti2ation for all streams. September 20, 2006 Seahawks/09~2()...M Laiu Stnam Report doc CEDAROCK CONSULTANTS, INC. andA.C. KINDIG & CO. Page 38 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan MOUNTAINSTAR/SUNCADIA RESORT Trendwest Resorts Inc. Authored aquatic affected environment and impacts sections for this 5,000 acre residential and resort development. Developed conceptual mitigation options for potential effects to resident and anadromous salmonids. Worked with WDFW, WDOE, NMFS, USFWS, and local Tribes to establish fisheries protection measures for new bridges, water intakes, stream crossings, plats, and golf courses. REDMOND RIDGE DEVELOPMENT Quadrant Corporation Redmond, Washington Evaluated existing conditions and developed aquatic habitat protection measures for this 460-acre land development in western Washington. Authored fisheries sections of EIS. Worked with County staff to identify fish-bearing stream reaches based on site-specific protocol. SKAGIT HIGHLAND DEVELOPMENT Mount Vernon, Washington Provided fisheries support during the EIS and ESA consultation process for this 209- acre project in the City of Mount Vernon. Conducted field reconnaissance, developed mitigation plans, prepared SEPA and BE documents, negotiated permits with city, state, and federal agencies, and testified at public hearings. CLEARVIEW WATER SUPPLY PROJECT· BIOLOGICAL ASSESSMENT Snohomish County, Washington Prepared a biological assessment for bull trout and Chinook salmon in support of a 8.2-mile water supply pipeline near the town of Snohomish, Washington. The pipeline route crossed numerous fish-bearing streams including the Snohomish River, a major salmon bearing water course. Potential impacts to buJI trout and Chinook salmon were assessed. MATS MATS QUARRY EIS AND BIOLOGICAL ASSESSMENT Mats Mats Bay, Washington Prepared DEIS fisheries sections and a biological assessment to address potential impacts of expanded hard rock quarry operations on aquatic species. Puget Sound runs of chinook salmon, chum salmon, and bull trout were addressed in the BA. PALMER-MONROE SAND AND GRAVEL MINE Snohomish County, Washington Completed fisheries analysis of existing conditions and potential impacts of proposed gravel quarry in the Snohomish River floodplain. A fisheries restoration plan was developed for the conversion of an agricultural ditch into a stream section as mitigation for the removal of another ditch during gravel excavation. LONE STAR GRAVEL MINE -SEPA CHECKLIST Maury Island, Washington Completed fisheries technical report as part of expanded SEPA checklist. The document analyzed potential project impacts to regional fisheries resources from the applicant's proposal to reopen an historic gravel quarry on Maury Island. September 20, 2006 Seahawb/09-20-06 Lakes Stream Report.doc CEDAROCK CONSULTANTS, INC. andA.C. KINDIG & CO. Page 39 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan l!DUCATION M.l.A., University of Washington, 2000 B.A., Natural Sciences, emphasis in Biology, Westmont College; 1991 Af"PILIATIONS American Society of Landscape Architects PROFESSIONAL REGISTRATIONS Landscape Architect, Washington, 2004 HONORS + AWARDS Honor Award, Physical Plans Category, American Planning Association, Washington State Chapter, "Tol1gate Fann Central Meadow Master Plan," 2005 Merit Award in Research, American Society of Landscape Architects, "Residential Impacts lo Water Quality and Aquatic Habitats,• 2004 Merit Award, American Society of Landscape Architects, "Academic Award 2000" Design Award, American Society of Landscape Atehitects, Weshington Chapter, "Lewis & Clarf( Memorial al Station Camp· 2000 Design Award, American Society of Landscape Architects, Washington Chapter, "Reduction of Impervious Surfaces in New Development for Snohomish County," 1999 Design Award, American Society ol Landscape Arehitects, Washington Chapter, "Vision Plan for Pathfinder Elementary School-Stormwater Management Opportunities,• 1999 Design Award, American Society of Landscape Architects, Washington Chapter, "Green Well Park," 1998 September 20, 2006 Seahawblf)9--2()..()6 Laku Slream Report.doc JEFFREY K. BOUMA Landscape Architect EDAW Inc. Mr. Bowna is a landscape architect with over six years of experience in landscape planning and design. He holds a Masters degree in Landscape Architecture and his professional experience includes landscape analysis, conceptual design at various scales, design and construction document production, construction administration, public meeting facilitation, recreation planning and design, and project management for park, college campus, civic campus, rest area, and other public and private projects. He is interested in creative ways to integrate natural systems with the meaningful design of space, particularly in the context of urbanizing settings-thus providing unique, functional., and sustainable places for people to live, play and learn. PROJECT EXPERIENCE Seattle S.ahawks Football Training Complex, Renton, WA Project Manager/Landscape Architect CLIENT: Vulcan/Seattle Seahawks EDAW is currently providing landscape and hardscape services as part of the consultant team led by Crawford Architects for a new headquarters and training facility in Renton, WA. Polson Creak Day Use Area, Lake Cascade, ID Project Manager/Landscape Architect CLIENT1 Tamarack Resort EDAW is cunently providing concephtal master planning and design services for the proposed redevelopment of an existing State Park campground and boat launch located on the west side of Lake Cascade 90 miles north of Boise, Idaho. East Capito I Campus, Phases IV and V, Olympia, Washington Landscape Architect CLIENT: State of Washington Department of General Administration Mr. Bouma assisted in the preparation and organization of construction documents and construction administration of a 12-acre landscaped plaza that sits above two massive parking garages and a bisecting street that lie beneath a main portion of the Washington State East Capitol campus. Shoreline Community College Pagoda Union Bulldlng; Washington Landscape Architect CLIENT: State of Washington Department of General Administration Mr. Bouma is currently working with a design team led by Opsis Architects to renovate the student Pagoda Union Building (PUB) and the surrounding site. Wanapurn Turbine lnterpnttlva Partc.; Washington Landscape Designer CLIENT: Grant Public Utilities District Mr. Bouma managed the developed of concept plan, section, elevation, and · detail drawings for this park where the centerpiece turbine, a 12S-ton steel monolith, will be set upright on its nose, allowing visitors to walk beneath it and its large blades. CEDAROCKCONSULTANTS, INC. andA.C. KINDIG& CO. Page 40 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and lake Study/Mitigation Plan September 20, 2006 Seahawks/09-10.(}6 Lakes Stream R~[XJrLdoc Clark's Dismal Nltch-Lewis & Clark National Historic Park; Washington Project Manager/Landscape Architect CLIENT: State of Washington Department of General Administration, Washington State Department of Transportation, Washington State Historical Society, NationaJ Park Service Mr. Bouma is currently working with the design team of Perltins + Will Architecture on a Master Plan for the redesign of a WSDOT safety rest stop and interpretive park near the mouth of the Columbia River along S~ 401. Tollgate Farm-Central Meadow Master Plan Project Manager/Landscape Designer CLIENT: City of North Bend Mr. Bouma was responsible for the development of a long range management plan that complies with City policy, meets a broad range of CO:mmunity needs, and balances priorities for open space, active recreation, trails, wildlife, agriculture and historic preservation. Pit 3, 4, and 5 Hydroelectric Project: Recreation Site Concepts and Interpretation Plan; California Project Manager/Landscape Architect CLIENT: Pacific Gas and Electric Company (PG&E) Mr. Bouma was responsible for developing site concept plans for improvements to more than twenty recreation facilities, including campgrounds, day use areas, boat launches, and trails in the Pit River basin in northern California. Marvin Alexander Beach Park; Lake Almlnor, California Project Manager/Landscape Architect CLIENT: Pacific Gas and Electric Company (PG&E) Mr. Bouma was responsible for the design and construction document developmeJ\t for a 5-acre day use area on the south shore of lake Alminor in northern California. An ecologically sensitive design of the park minimized site disturbance, grading, and tree removal while providing parking for 30 vehicles, a restroom, and ADA trail to the 1-acre beach area. Valley West Subdivision Park, Phase 11; Bozeman, Montana Project Manager/Landscape Designer CLIENT: Aspen Enterprises Mr. Bouma was responsible for the development of construction documents, including a site plan, planting plan, and irrigation plan, for a 10-acre park containing a new 2.5-acre lake, wetlands, and an existing stream. DIiion Readiness Center, DIiion, Montana Project Manager/Landscape Designer CLIENT1 United States National Guard As project manager, Mr. Bouma developed construction documents and specifications for planting and irrigation in coordination with the architecturaJ prime consultant. A palette of native plants, supplied with irrigation from a drip system, was used to provide viability and reduce long-term landscape maintenance and replacement cost. CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO. Page 41 Seahawks Corporate Headquarters and Training Facility Renton, Washington Stream and Lake Study/Mitigation Plan APPENDIX3 JOINT AQUATIC RESOURCES PERMIT APPLICATION (JARPA) September 20, 2006 Seahawb/0~20-06 Laka Stream Report.doc CEDAROCK CONSULTANTS. INC. and A.C. KINDIG & CO. Page 42 . -; ·-_~_'\ •_: , I .· :. , ; __ ·, •. ,C. . ' . AGE~G\¥ USE ONLY Agency Reference #: Date Received: Circulated by: ' ·. (Jc,cal govt or agency) JOINT AQUATIC RESOURCES PERMIT APPLICATION FORM (JARPA) (for use In Washington State) PLEASE TYPE OR PRINT IN BLACK INK ff.iiir.il ~ D Application for a Fish Habitat Enhancement Project per requirements of RCW 77,55.290. You must submit a copy of this completed JARPA application form and the (Fish Habitat Enhancement JARPA Addition) to your local Government Planning Department and Washington Department of Fish & Wildlife Area Habitat Biologist on the same day. Based on the instructions provided, I am sending copies of this application to the following: (check all that apply) D Local Government for shoreline: 0 Substantial Development D Conditional Use D Variance D Exemption D Revision D Floodplain Management D Critical Areas Ordinance 181 Washing1on Department of Fish and Wildlife for HPA (Submit 3 copies to WDFW Region) Project Is exempt from procedural reqts of HPA D Washing1on Department of Ecology for 401 Water Quality Certification (to Regional Office-Federal Permit Unit) D Washington Department of Natural Resources for Aquatic Resources Use Authorization Notification D Corps of Engineers for: O Section 404 0 Section 10 permit D Coast Guard for General Bridge Act Permit D For Department of Transportation projects only: This project will be designed to meet conditions of the most current Ecology/Department of liransportation Water Quality Implementing Agreement SECTION A • Use for all permits covered by this application. Be sure to ALSO complete Section C (Signature Block) for all pennit applications. 1. APPLICANT FOOTBALL NORTHWEST LLC, A TIN: MR. RAY COLLIVER (Purchaser of Ule property) MAILING ADORESS 505 FIFTH AVENUE SOUTH, SUITE 900, SEATTLE, WA 98104 WORK PHONE E-MAIL ADDRESS I HOME PHONE IFAXf: 206 342 2000 206 342 3554 ff an agent l.s acting for the applicant during the permit process, complete #2. Be sure agent signs Section C (Signature Block) for all permJt application& 2. AUTHORIZED AGENT CARL HADLEY, CEDAROCK CONSULTANTS, INC. MAILING ADDRESS 19609 244• AVENUE NE, WOODINVILLE, WA 980n WORK PHONE E-MAIL ADDRESS r I HOME PHONE ~AX.I 425-788-0961 CARL.HADLEY@VERIZON.NET 25-788-5562 3. RELATIONSHIP OF APPLICANT TO PROPERTY: 0 OWNER 1!!1 PURCHASER 0 LESSEE 0 OTHER: 4. NAME, ADDRESS. AND PHONE NUMBER OF PROPERTY OVYNER(S~ IF OTHER THAN APPLICANT: PORT QUENDALL COMPANY, 505 FIFTH AVENUE SOUTH, SUITE 900 SEATTlE, WA 98104 342-2000 5. LOCATION (STREET ADORES$, INCLUDING CITY, COUNTY AND ZIP CODE. WHERE PROPOSEO ACTMlY EXISTS OR Will. OCCUR} 5015 LAKE WASHINGTON BLVD N, CITY OF RENTON, KING COUNTY. LOCAL GOVERNMENT WITH JURISDICTION (C1TY ~ COUNTY}: CITY OF RENTON WATERBOOY YOU ARE WORKING IN-GYPSY SUBBASIN DRAINAGE & LAKE TRIBUTARY OF WRIAt iwASHINGTON LAKE WASHINGTON OS-UNNUMBERED IS THIS WATERBODY ON n£ 303{d) UST'/' YES a NO El IFYES, WHATPARAMETER.(S"f/ h"' :// . vi-ro inks/. ·red · .h· • 303d LIST WEBSITE %SECTION ~SECTION ~TOWNSHIP I RANGE I GOVERNMENT LOT SHORELINE DESIGNATION SW 9 4 05 URBAN LATIT\JDE &LONGITUDE, N47.536 W122.199 (WGS 84) ZONING DESIGNATION TAX PARCEL NO: ONR STREAM TYPE, IF KNOWN PARCEL #S 292459001 AND '2924059015 GYPSY: 3 -FISH BEARING; LAKE WASHINGTON: 1 -SHORELINE )ARPA, Revised 7/02 Contact the State of Washington Office of Permit Assistance for latest version, 360/407-7037 or 800/917-0043 43 le. DESCRIBE THE CURRENT USE OF THE PROPERTY, AND STRUCTURES EXISTING ON THE PROPERTY. HAVE YOU COMPLETED At,tf PORTION OF THE PROPOSED ACTIVITY ON THIS ROPERTY? 0 YES 181 NO FOR ANY PORTION OF THE PROPOSED ACTIVITY ALREADY COMPLETED ON THIS PROPERTY, INDICATE MONTH ANO YEAR OF COMPLETION. E PROPERTY CURRENTLY CONSISTS OF VACANT LAND COVERED IN PART WITH OLD ASPHALT. SCRUB SHRUBS AND TREES GROWING ~INCE THE PROPERTY WAS LAST GRADED IN 1990 COVER PORTIONS OF THE LOT. IS THE PROPERTY AGRICULTURAL LAND? 0 YES C31 NO ARE YOU A USDA PROGRAM PARTICIPANT? DYES CSINO 7a. DESCRIBE THE PROPOSEDVVORK THAT NEEDS AQUATIC PERMITS: COMPLETE Pl.ANS AND SPECIFICATIONS SHOULD BE PROVIDED FOR All WORK WA.TERWARD OF THE ORDINARY HIGH WATER MARK OR LINE. INCLUDING TYPES Of EQUIPMENT TO BE USED. IF APPL YING FOR A SHORELINE PERMIT, DESCRIBE & WORK WITHIN AND BEYOND 200 FEET OF THE ORDINARY HIGH WATER MARK. IF YOU HAVE PROVIDED A TI ACHED MATERIALS TO DESCRIBE YOUR PROJECT, YOU STILL MUST SUMMARIZE THE PROPOSED WORK HERE. ATI ACH A SEPARATE SHEET IF ADDITIONAL SPACE IS NEEDED. . APPROXIMATELY 125 FEET OF THE GYPSY SUBBASIN DRAINAGE ON THE PROJECT SITE (ALL REMAINING OPEN CHANNEL ON THE SITE) WILL BE PLACED IN A CULVERT. • THE EXISTING CULVERT UNDER THE SITE WILL BE REPLACED WITH A LARGER PIPE AND THE ALIGNMENT WILL BE MOVED SLIGHTLY (SEE APPENDIX 1, SHEETS CE301-302). • FIVE NEW STORMWATER OUTFALLS TO LAKE WASHINGTON WILL BE BUILT (SEE APPENDIX 1, SHEET CE245) . PREPARATION OF DRAWINGS: SEE SAMPLE DRAWINGS ANO GUIDANCE FOR COMPLETING THE DRAWINGS. ONE SET OF ORIGINAi. OR GOOD QUALITY REPRODUCIBLE DRAWINGS MQil BE ATTACHED. NOTE: APPLICANTS ARE ENCOURAGED TO SUBMIT PHOTOGRAPHS OF THE PROJECT SITE, BUT THESE DO NOT SUBSTITUTE FOR DRAWINGS. THE CORPS OF ENGINEERS IANO COASTGUARD REQUIRE DRAWINGS ON 8·112 X 11 INCH SHEETS. LARGER DRAWINGS MAYBE REQUIRED BY OTHER AGENCIES, 7b. DESCRIBE THE PURPOSE OF THE PROPOSED WORK AND 'WHY YOU WANT OR NEED TO PERFORM IT AT THE SITE. PLEASE EXPLAIN ANY SPECIFIC NEEDS THAT HAVE INFLUENCED THE DESIGN. • SOILS ACROSS THE SITE WILL BE CAPPED WITH UP TO THREE FEET OF CLEAN SOIL AS PART OF THE REMEDIATION ACTION. TO ELIMINATE ONGOING EROSION OF THIS MATERIAL, AND REDUCE GROUNDWATER FLOW THROUGH THE SOILS, THE REMAINING OPEN PORTION OF THE GYPSY SUBBASIN DRAINAGE ON THE PROJECT SITE WILL BE CULVERTED AND FILLED. • THE REVISED ALIGNMENT WILL ALLOW THE NEW CULVERT TO BE CONSTRUCTED IN THE DRY WHILE CREEK FLOW REMAINS IN THE EXISTING PIPE. THE PROPOSED ALIGNMENT HAS BEEN SELECTED TO ACCOMMODATE PROJECT DEVELOPMENT FEATURES. • STORMWATER FROM THE SITE WILL BE DISCHARGED DIRECTLY TO LAKE WASHINGTON AFTER TREATMENT. TO PREVENT LARGE QUANTITIES OF WATER FROM BEING RELEASED AT ANY ONE LOCATION, AND TO ACCOMMODATE THE FLAT SITE, STORMWATER WILL BE DISCHARGED AT UP TO FIVE DIFFERENT LOCATIONS ALONG THE SHORELINE. DESCRIBE THE POTENTIAL IMPACTS TO CHARACTERISTIC USES OF THE WATER BODY. THESE USES MAY INClUDE ASHANDACUATIC LIFE, WATER QUALITY, WATER SUPPLY, RECREATION, and AESTHETICS. IDENTIFY PROPOSED ACTIONS TO AVOID, MINIMIZE, AND MITIGATE DETRIMENTAL IMPACTS.AND PROVIDE PROPER PROTECTION OF FJSH AND AQUATIC UFE. IDENTIFY WHICH GUIDANCE DOCUMENTS YOU HAVE USED. ATTACH A SEPARATE SHEET IF ADDITIONAL SPACE IS NEEDED. SEE ATIACHMENT 7C. 7d. FOR JNWATER CONSTRUCTION WORK, WILL YOUR PROJECT BE 1N COMPLIANCE WITH THE STATE OF WASHINGTON WATER QUALITY STANDARDS FOR TURBIDITY WAC 173.201A-110? B YES D NO {SEE !.!§~F!.!L D~FINITIQN§ AND INSIRl!C:!IQM~) 8. Vv'ILL THE PROJECT BE CONSTRUCTED IN STAGES? DYES "NO PROPOSEO STARTING OATEc November 1, 2006 (FILLING THE OPEN CHANNEL, CONSTRUCTING THE NEW CULVERT, AND CHANGEOVER FROM THE OLD CULVERT WILL TAKE PLACE DURING THE WINTER PER THE ATIACHED CULVERT CONSTRUCTION PLAN DESCRIBED IN ATIACHMENT 7C) ESTIMATED DURATION OF ACTIVITY: iWO YEARS ending June 2008 9. CHECK IF At{'( TEMPORARY OR PERMANENT STRUCTURES WILL BE PLACED: 0 WATERWARDOF THE ORDINARY HIGH WATER MARK OR LINE FOR FRESH OR TIDAL WATERS: AND/QR DWATERWARD OF MEAN HIGHER HIGH WATER LINE IN TIDAL WATERS 10. WILL FILL MATERIAL(ROCK, FILL. BULKHEAD, OR OTHER MATERIAL) BE PLACED: B WATERWARD OF THE ORDINARY HIGHWATER MARK OR LINE FOR FRESH WATERS? Gypsy Subbasin Drainage IF YES, VOLUME (CUBIC YARDS) 105 /AREA Q.Q3 (ACRES 0 WATERWARD OF THE MEAN HIGHER HJGH WATER FOR TIDAL WATERS? IF YES, VOLUME (CUBIC YARDS) AR~ (ACRES) JARPA, Revised 7/02 Contact the State of Washington Office of Permit Assistance for latest version, 360/407-7037 or 800/917-0043 44 11. WILL MATERIAL BE PLACED IN WETLANDS? DYES "NO IFYES: A IMPACTED AREA IN ACRES: B. HAS A DELINEATION BEEN COMPLETED? IF YES, PLEASE SUBMrT WITH APPLICATION. DYES ONO C. HAS A WETLAND REPORT BEEN PREPARED? IF YES, PLEASE SUBMIT WITH APPLICATION. 0YES ONO D. TYPE AND COMPOSITION OF FILL MATERIAL (E.G., SANO. ETC.): E. MATERIAL SOURCE· F. LIST ALL SOIL SERIES (TYPE OF SOIL) LOCATED AT THE PROJECT SITE, & INDICATE IF THEY ARE ON THE COUNTY'S LIST OF HYDRIC SOILS. SOILS INFORMATION CAN BE OBTAINED FROM THE NATURAL RESOURCES CONSERVATION SERVICE (NRCS): G. WILL PROPOSED ACTIVITY CAUSE FLOODING OR DRAINING OF WETLANDS? DYES IIDNO IF YES, IMPACTED AREA IS_ ACRES OF DRAINED WETLANDS. NOTE: If your prcjed will Im pad greater than % or an acre of wetland, submit a mitigation plan to the Cofp& and EcoloQy for approval along with lhe JAAP A fonn NOTE: a 401 watw quaHty cet1iflcalion WIR be reqllfred from Ecolot}y in addition to an approved mitigation plan if your project impac:ts IWlttJnds that in:: aJ r,n,atw titan M am in size, or b) tidal wetlands or wetfa/"lds adjac;ent to tidal water. Please submit ttlft JARPA form and mltfgetkm (Jan to Ecology tor an iltdividu&l 401 certification ilaJ orb) appli&s. 12. STORMWATERCOMPUANCE FOR NATIONWIDE PERMITS ONLY: THIS PROJECT IS (OR WILL BE) DESIGNED TO MEET ECOLOGY'S MOST CVRRENT STORMWATER MANUAL, OR AN ECOLOGY APPROVED LOCAL STORMWATER MANUAL DYES ONO IF YES-'WHICH MANUAL WJU YOUR PROJECT BE DESIGNED TO MEET If NO-FOR CLEAN WATER ACT SECTION 401 AND 404 PERMITS ONLY-PLEASE SUBMfT" TO ECOLOGY FOR APPROVAL. ALONG W11H THIS JARPA APPLJCATION, DOCUMENTATION THAT DEMONSTRATES THE STORAM'ATER RUNOFF FROM YOUR PROJECT OR ACTIVITY WILL COMPLY WITH THE WATER QUALITY STANDARDS, WAC 173.201(A) 13. WILL EXCAVATION OR DREDGING BE REQUIRED IN WATER OR WETLANDS? CYES "No IFYES: A VOI..UME: (CUBICYARDS}/AREA (ACRES) B. COMPOSITION OF MATERIAL TO BE REMOVED: C. DISPOSALSrTE FOR EXCAVATED MATERIAL: D. METHOO OF DREDGING: . 14. HAS THE STATE ENVIRONMENTAL POLICY ACT (SEPA) BEEN COMPLETED? ISIYES ONO sEPA LEAD AGE Nev: Dept of Ecology sEPA oe.c1s10N: ON$ for North Baxter; MONS for South Baxter SUBMIT A COPY OF YOUR SEPA DECISION LETIER TO WDFW AS REQUIRED FOR A COMPLETE APPLICATION DECISION DATE (ENO OF COMMENT PERIOD): Aprll 5 20Q0 15. LIST OTHER APPLICATIONS, APPROVALS, OR CERTIFICATIONS FROM OTHER FEDERAL, STATE OR LOCAL AGENCIES FOR MY STRUCTURES, CONSTRUCTION, DISCHARGES, OR OTHER ACTIVITIES DESCRIBED IN THE APPLICATION (I.E., PRELIMINARY PLAT APPROVAL, HEALTH DISTRICT APPROVAL, BUILDING PERMIT, SEPA REVIEW, FEDERAL ENERGY REGULATORY COMMISSION LICENSE {FERC), FOREST PRACTICES APPLICATION, ETC.) ALSO INDICATE WHETHER \o\lORK HAS BEEN COMPLETED AND INDICATE ALL EXISTING WORK ON DRAWINGS. NOTE: FOR USE WITH CORPS NATIONWIDE PERMITS, IDENTIFY WHETHER YOUR PROJECT HAS OR VVILL NEED AN NP DES PERMIT FOR DISCHARGING WASTEWATER ANO/OR STORMWATER. ~PE OF APPROVAL SSUING AGENCY DENTIFlCATION bATE OF APPLICATION bATE APPROVED lcOMPLETED? NO. (TARGET DATES) Engineering Design Report bepartment of Ecology September 22, 2006 No boundation Permit ity of Renton November 24, 2006 NO Building Permit bty of Renton April 5, 2007 No lsite Master Plan City of Renton September 20, 2006 NO 16. HAS Ar,rf AGENCY DENIED APPROVAL FOR THE ACTIVITY YOU'RE APPLYING FOR OR FOR ANY ACTMTY DIRECTLY RELATED TO THE ACTMTY DESCRIBED HEREIN? 0 YES l!IINO IF YES, EXPLAIN: JARPA, Revised 7/02 Contact the State ofWashington Office of Permit Assistance for latest version, 360/407-7037 or 800/917-0043 45 CT/ON B -Use for Shoreline and Corps of Engineers permits~ . TOTAL COST OF PROJECT THIS MEANS THE FAIR MARKET VALUE OF THE PROJECT. INCLUDING MATERIALS, LABOR, MACHINE RENTALS, ETC. 7b. IF A PROJECT OR ANY PORTION OF A PROJECT RECEIVES FUNDING FROM A FEDERAL AGENCY, THAT AGENCY IS RESPONSIBLE FOR ESACONSULTATION. PLEASE INDICATE IF YOU 'AILL RECEIVE FEDERAL FUNDS AND WHA.T FEDERAL AGENCY IS PROVIDING THOSE FUNDS. SEE INSTRUCTIONS FOR INFORMATION ON ESA .. EDERAL FUNDING O YES ONO IF YES, PLEASE UST THE FEDERAL AGENCY ha. LOCAL GOVERNMENT WITH JURISDICTION· 19. FOR CORPS, COAST GUARD, AND DNR PERMITS, PROVIDE NAMES, ADDRESSES, AND TELEPHONE NUMBERS OF ADJOINING PROPERTY OWNERS, LESSEES, ETC ... PLEASE NOTE: SHORELINE MANAGEMENT COMPUANCE MAY REQUIRE ADDITIONAL NOTICE -CONSULT YOUR LOCAL GOVERNMENT. J-IAME kDDRESS PHONE NUMBER SECTION C -This section MUST be comtJleted for any oennit covered by this .,. ... ,.,I/cation 120. APPLICATION IS HEREBY MADE FORA PERMIT OR PERMITS TO AUTHORIZE THE ACTMTIES DESCRIBED HEREIN. I CERTIFY THAT I AM FAMILIAR 'MTH THE NFORMATION CONTAINED IN THIS APPLICATION, AND THAT TO THE BEST OF MYKNOV'A..EDGE AND BELIEF, SUCH INFORMATION IS TRUE, COMPLETE, AND ~CCURATE. I FURTHER CERTIFY THAT I POSSESS THE AUTHORITY TO UNDERTAKE THE PROPOSED ACTMTIES. t HEREBY GRANT TO THE AGENCIES TOW-VCH h°HIS APPLICATION IS MADE, THE RIGI-IT TO ENTER THE ABOVE-DESCRIBED LOCATION TO INSPECT THE PROPOSED, IN-PROGRESS OR COMPLETED 1/vORK. I AGREE TO ST ART WORK QM!.Y AFTER All NECESSARY PERMITS HAVE BEEN RECEIVED. SIGNATURE OF APPLICANT PATE SIGNATURE OF AUTHORIZED AGENT pATE DATE I HEREBY DESIGNATE TO ACT AS MY AGENT IN MATIERS RELATED TO THIS APPLICATION FOR PERMIT(S). t UNDERSTAND I MUST SIGN THE PERMIT . THAT IF A FEDERAL PERMIT IS ISSUED, • GNATUREOF APPLICANT DATE IGNATURE OF LANDOWNER {EXCEPT PUBLIC ENTITY LANDOWNERS, E.G. DNR) I THIS APPLICATION M.!&I BE SIGNED BY THE APPLICANT ANO THE AGENT, IF AN AUTHORIZED AGENT IS DESIGNATED. 18 U S.C §1001 provida.s. that Whoever, in any mannerwilhll'I the jurisdiction of any departmelll or agency of the United States kncrwmgly fa1Sifies, cooceals, or covens up by any bid:, scheme, ordevtce a material fact or makes any false, fictJti~s. or frau(j,Jlent statements °' repl'Mentatioos or make& oruae& any false wriHng or document knowing same to ooolain any false, fictitious, or fraudulent statement or entry, shall be fined not more than $10,000 or imprisoned not more than 5 years or both. COMPLETED BY LOCAL OFFICIAL A Nature of the existing shoreline. (Describe type of shoreline, such as marine, stream, lake, lagoon, marsh, bog, swamp, flood plain, floodway, delta; type of beach, such as accretion, erosion, high bank, low bank, or dike; material such as sand, gravel, mud, clay, rock, riprap; and extent and:type ofbulkheaqing, if any) · B. In the event tha.t any of the proposed builqingi or sJructures Will exceed ~ ~!ti!ihl .¢.t~irty-~~e ~t; ab!?"~ the aver;ige grade . level, indicate the approximate location of and number of residential units, existing and potential, that willhave. an.obstructed view: •·•, 'v~·,-:, . . , .. , C. If the application involves a conditional use or variance,. set forth in full that portion of the master program which provides that the proposed use may be a condttionai use, or, in the case of a variance, from·which the variance is being sought: These Agencies are Equal Opportunity and Affumalive Action employers. For special accommodation needs, please contact the appropriate agency in the instn.Jctions. JARPA, Revised 7/02 Contact the State of Washington Office of Pennit Assistance for latest version, 360/407-7037 or 800/917-0043 . 46 Attachment 7c. DESCRIBE THE POTENTIAL IMPACTS TO CHARACTERISTIC USES OF THE WATER BODY. THESE uses MAY INCLUDE FISH AND AQUATIC LIFE. WATER QUALITY. WATER SUPPLY. RECREATION. and AESTHETICS. IDENTIFY PROPOSED ACTIONS TO AVOID, MINIMIZE, AND MITIGATE DETRIMENTAL IMPACTS, AND PROVIDE PROPER PROTECTION OF FISH AND AQUATIC LIFE. IDENTIFY WHICH GUIDANCE DOCUMENTS YOU HAVE USED. ATIACH A SEPARATE SHEET IF ADDITIONAL SPACE IS NEEDED. The proposed action wiU eliminate approximately 125 feet of open channel, will result in a slightly longer culvert across the project site, will affect existing riparian vegetation along the Gypsy Subbasin Drainage and Lake Washington, and will result in some disturbance to the shoreline of Lake Washington above and below the ordinary high water mark. The remediation action is designed to improve water quality in Lake Washington and is funded by the proposed development. Culverting of the on-site open channel is a remediation measure required under the Consent Decrees with Ecology to eliminate erosion of soil into Gypsy Subbasin Drainage and Lake Washington by capping and institutional controls on the North and South Baxter Properties. While resident salmonids are reported through anecdotal reports upstream of the project site, the short piece of open channel on the site is not known to contain fish. Anadromous fish are prevented from moving upstream past the project site by blockages within the railroad right-of-way. So the small increase in culvert length will not affect upstream fish passage. In addition to the increase in culvert length, the culvert diameter will also be increased to accommodate higher peak flows and reduce upstream flooding which occasionally floods parking lots and roads east ofl405 which leads to further water quality impacts. During construction, Gypsy Subbasin Drainage will remain intact until construction of the new culvert is complete (refer to the Gypsy Creek Culvert Replacement section which follows). Perimeter barriers to sheet flow and other construction Best Management Practices from the 2005 King County Surface Water Design Manual will be employed as warranted to prevent unintended sediment discharge to Lake Washington or beyond any of the site boundaries (see Appendix I, CE201-204). All stormwater from the site will be collected in a temporary sediment trap and discharged to the sanitary sewer per the Consent Decrees. No construction stormwater will discharge to Gypsy Subbasin Drainage or to Lake Washington. Post construction, no stormwater will be discharged to Gypsy Subbasin Drainage from the project. Treated stormwater will be discharged to Lake Washington after treatment meeting the Enhanced Water Quality treatment from the 2005 King County Surface Water Design Manual. To enhance riparian function along the Lake Washington shoreline, all exotic species will be removed and buffers meeting City of Renton critical area requirements will be replanted with native trees and shrubs (see Appendix I, Sheet LIOO). Gypsy Creek Culvert Replacement To protect water quality and any fish in the Gypsy Subbasin Drainage, the following conceptual culvert replacement scenario is proposed. Final design will result in refinement of this proposal with the overall goal of avoiding environmental impacts. a. Install all new structures and pipe with the exception of connections to the existing system. The existing system will continue to function normally while construction of the new facilities are underway (3-4 weeks). b. Remove fish from the Gypsy Subbasin Drainage. c. Dam up the culvert at the east property line ( or east of the railroad tracks if an access agreement from the railroad can be obtained) and pump flow to Lake Washington (will run bypass line through existing culvert or over tracks, depending on train schedule). Pump intake will be screened to provide appropriate intake velocities and avoid entraining fish. d. Install structures connecting new pipe to existing pipe (3 to 4 days). e. Remove dam and bypass/pump. f. Fill open portion of Gypsy Subbasin Drainage once new system has been shown to function appropriately. __ , --~~-~-~~-~~-~ _1 ~ _L _ _L_ --l_ 'i;I 10 11 .!r__~-----L " -' p~ RE: L 1 00 (FIGURE 9.1) FOR LANDSCAPE & HARDSCAPE INFORMATION ~ ! J ', I I ' ' "-1 L- l 'I Jl ~ ~ "c \ ',,,',,, ", -----, ____ _ CURB----- EXIS1 ING POWER POLE LOCATION----...... SOUTH PROPERTY FENCE LINE PSE EASEMENT LINE (TBD) ---~ EXISTING POWER POLE LOCATION LAKE ~------;: ,25'NI ! <:\ ,L/ ~ i ji ' 'f ;./ .l! I ' ,: ' 'I -! _ _;__:__: __ ::Ji! 1· • ;! , NAIUKAL J1. f--_j_-===;: , ; I c CRASS j -. I! '\\ ! 1 . ~ i S@FACE=fhr i;l I 'it--P21 • :1 -i ---ll 'Ii !I: I' . I w ~ 29; 11, . ',1 ~ I it . I F 'I ' ' ' ! ; 2' !' aj I I, i, , ""16' , C•t: '172' ·,72· 172' CURB:----~ .J ~ ,_ NEW 1-STORY MAINTENANCE I ' ~1 ' I "' SHED l~)<zJ COVERED CAR WASH PAD EXISTING POWER POLE LOCATION It -\Q=.;/'\\--1-, MAINT. PARKING~__:::[ 4 STALLS - i SECURITY GATE ------- '~ ~ ' _/ 20' WASHINGTON -¥27.7' NOTE: OHW~ 1 8.8' (NAVD88) OR 15.2' (NGVD29) FIRELANE ACCESS 100 YEAR FLOORDPLAIN AT LAKE WA. 0.H.W.M. I GRASS-CRETE) U91:H s}- PRACTICE FACILITY " ,, ,, ,, EXISTING BUILDING STRUCTURE TO BE 1 0' PUBLIC ACCESS 4' ACCESS WALK SECURITY FENCE 16' SERVICE ROAD ,c{j L SECURITY GATE & FENCE ~--W//ff~j' ~ u~"u,~610:4 IJO:\IIIEl(IQ JAIJIA L J'·" ( 'L l~IUI 11 UI HAI . -= di' /1,, ~ 0- ~ '~ 1 1 ,-! ! NOTE: STREAM CLASS LAKE WASHINGTON -CLASS 1 GYPSY SUB BASIN DRAINAGE -CLASS 2 (RE: FIGURE 8.3) PARKING COi/NT GENERAL SURFACE PARKING SECURE TEAM PARKING 195 STALLS 104 STALLS PROPOSED RAILWAY CROSSING --------------------- ,, TOTAL ~ 299 STALLS j ---1N1ERS1 A 1E---405 0 50' 100' ~ -----------' c~ ,Will -------------- ·----"" -------- ,, @ """WFOflt>jl,IIQfflCTII, U.C 110,---= _,,,,,,11'111'41(11 .,!,u:n.a,,; -.C6'11.,;,.- ,I ---- -J.!!':) I -------- • L cl:S II) (.) ... Q) -' z t::: >, -' 0 -t-t-<ti = (/) (!) ::::, ·-w C" u :s: ,!; "O(t!II <ti LL. !;: ~ Q) Cl O :S: :c C: z . " ·-...J z 1/) C: -' 0 ·-< t--" <ti m z 3:._t-w <ti f-0 c:: .c: fi: <ti Q) G U) ! i I ! i ! l ' ' I l ' 11 I ' j ' -I ijj D C • '"""' CRAWfORO ·~~ 1:~ SITE PLAN A001. 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MF flELD SECTION INCLIJXS 16" Of SANO Ali) 4" Of CAPILLARY BRE.e.t; ,----:r~~[JL~l~L/.JPES LOCHED WITHIN TH!:S SOIL LAYER ,-.,/ SOie CAP ll(JICATM FABRIC " ~ I ./. /---CEl£NT TR(A1UJ ON-SITE SOIL f -;;J-__ ,-GEOGRID ~1 / -,%f>#f". d7=4i'S# c:;f.'f'._-;M"-·-;,',f'--;J/--i<t7'-f#."'/,.i/ -3: J: CEMENT TfiEATED ON-SITE SOIL SUBGRADE AT NATURAL TURF FIELDS @. NTS CH21, C£2<3,CE22~ CE402 M.I.TIJR,l,L TURF flELO SECTION AND !WPORTEO FILL SDIL .,-ON-SITE FILL SOIL, / FIELD CCUECTOR Pif'ES LOCATfD 1111111N rHIS SOIL L Al'ER ,~GEOGRID ~ li ;- / ,--SOIL CAP ltlllCATllR FABRIC / ·.,, / / / / " 2f /'"' OEH ,rnoe / / ~ ; / ./ / / ' \ , ___ ; L,,°'- ~1 --~ -( ,~~,,, J ~ ~l_·'.Y~~ ' --.i __ (.'L -;,f.y .;#/ ;ff.7·-_#/. ";f;/. -// ";:;W_-/Y,Y,::.,v ';$' I ocrn=: LINE 2" BELOW COllECl1i PIPES CD.ENT TREATED ON-srn: SOIL ,,. 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Q) Cl) 1, l i a ii ".'! ;: -' -- SECTIONS AND DETAILS CE402 __ Appendix J Soil Management Plan Soil Management Plan Seahawks Headquarters and Practice Facility -North and South Baxter Properties Renton, Washington Prepared by: The RETEC Group, Inc. 1011 SW Klickitat Way, Suite 207 Seattle, Washington 98134-1162 RETEC Project Number: VULC1-19589-510 Prepared for: Football Northwest LLC 505 Fifth Avenue South Seattle, Washington 98104 October 2006 Table of Contents 1 Plan Scope and Pw:pose ..................................................................................... 1 2 Location of Contaminated Soil .......................................................................... 1 3 Environmental Caps ........................................................................................... 2 4 Notification Requirements ................................................................................. 2 5 Soil Handling Procedures ................................................................................. .3 5.1 Prior to Completing Work Activities .................................................... .3 5.2 During Work Activities ......................................................................... .3 6 Decontamination ............................................................................................... .4 6.1 Equipment ............................................................................................. .4 6.2 Personnel ............................................................................................... .5 6.3 Water Management ................................................................................ 5 7 Health and Safety ............................................................................................... 6 8 References .......................................................................................................... 1 VULCJ-19589-510 i 1 Plan Scope and Purpose Soil at the J. H Baxter North and South Properties (Sites) located in Renton, Washington (Figure 1) was the subject of remediation activities in conjunction with development work at the Sites. The remediation work was conducted to satisfy the requirements specified in the Prospective Purchaser Consent Decrees (between Washington State Department of Ecology [Ecology] and Port Quendall Company), form Restrictive Covenants, and Cleanup Action Plans (CAPs) (ThermoRetec, 2000b and ThermoRetec, 2000c). As part of development activities for the Sites, Football Northwest LLC (Owner), successor owner to the Port of Quendall Company, redeveloped the North and South Baxter properties as the location of the Seattle Seahawks Headquarters and Training Facility. The remaining cleanup activities (environmental capping and institutional controls) were outlined in the Engineering Design Report (EDR; RETEC, 2006) and were required to complete cleanup obligations in accordance with the Consent Decrees. Earlier cleanup activities were performed on the South Baxter property in 2002 and 2004 and certified as completed by a Partial Certificate of Completion letter issued by Ecology on April 10, 2006. This Soil Management Plan (SMP) addresses procedures associated with post- site-development penetration of the environmental cap and excavation of contaminated soil located below the environmental cap and the indicator layer. These SMP procedures include health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options at the Site as specified in the CAPs and form Restrictive Covenants (April 4, 2000), as approved in the attached letter from Ecology (Attachment A). In accordance with these documents, soil must be handled and managed in a manner that is protective of human health and the environment. Site maintenance staff and contractors shall follow the procedures outlined in this document during maintenance and construction activities at the Sites. 2 Location of Contaminated Soil The Sites were undeveloped until the mid-l 950s, when a wood treating facility was constructed on the Sites. Both creosote and pentachlorophenol (PCP) treating solutions were used. Creosote was used to treat railroad ties and pilings and PCP solutions were used to treat utility poles. Wood was treated and stored predominantly on the South Property; although some treated wood storage may have occurred on the North Property. Wood treating operations ceased in 1981. The North Property was then used on a limited basis for bark mulch storage. Contamination is present within pre-development site soil throughout the Sites. The extent of contamination was described in the Feasibility Studies and CAPs prepared for the Sites, copies of which are maintained by the VULC/-/9589-5/0 Soil Management Plan -Seahawh Headquarters and Practice Facility-North and South Baxter Properties. Renton, Washington the spread of contaminated soils to uncontaminated areas, if necessary; and 5) materials and methods for replacing the environmental capping system. 5 Soil Handling Procedures The following minimum procedures shall be followed for handling any soil associated with future planning and construction activities at the Sites. 5.1 Prior to Completing Work Activities 1) Determine location, nature, and anticipated depth of work activities and include the details on project specific figures. 2) Identify stockpile locations for temporary storage of soil material. The location of these stockpiles may be determined based on field activities, and should take into consideration proximity to receptors (including the Lake Washington, storm drains, site traffic, and ecological receptors). All stockpiling of soil at the site shall follow sediment erosion and control best management practices including runoff control and catch basin protection. Stockpiles shall be managed to minimize groundwater infiltration. Stockpile locations shall be protective of sensitive areas (wetlands, storm drains and the Lake Washington). 5.2 During Work Activities Soil handled during construction shall be managed in accordance with the following procedures: 1) Follow appropriate health and safety procedures. Work in these areas shall require that workers are appropriately trained m accordance with OSHA standards for worker protection. 2) If import fill is used for backfilling operations, the fill material shall be obtained from an approved source and meet the requirements specified in the project specifications. 3) Soil removed from site areas as part of construction activities that penetrate the environmental cap shall be temporarily placed in the stockpile area (see 4, below, for stockpiling procedures). · a. This soil may be reused on site as long as it is placed beneath an environmental cap. b. Soil that cannot be reused on site beneath an environmental cap shall be characterized for shipment and disposal at an approved offsite facility. At a minimum, samples collected from the VULC/-/9589-5/0 3 Soil Management Plan -Seahawks Headquarters and Practice Facility -North and South Baxter Propf!rties. Renton, Washington Approved methods for containment of decontaminated soil and water are: l) Holding the portion of the equipment that contacted contaminated soil (such as an excavator bucket or drill augers) over an area of contaminated soil, either in the excavation or in a truck, and brushing or rinsing that portion of the equipment so that the water and soil fall onto the contaminated soil below (this method applies primarily to heavy equipment). 2) Establishment of a decontamination area at the boundary between contaminated and uncontaminated soil, consisting of an area graded to drain into water collection system, a minimum of two layers of 6-mil or greater continuous plastic sheeting, and plywood placed on equipment travel areas to prevent equipment from tearing the plastic sheeting; or 3) Pressure washing within equipment or a structure specifically designed to contain the washed materials and waters and operated to prevent inadvertent release of these materials. 6.2 Personnel Personnel walking on contaminated soil and working with contaminated water should be protected through the use of appropriate personal protective equipment (PPE) and according to the procedures in the contractor health and safety plan. To prevent spreading of contaminated materials, personnel shall be decontaminated after walking on or working in contaminated soil, and prior to working with uncontaminated materials or leaving the facility. Work is typically anticipated to occur in Level D PPE, which normally consists oflong pants, steel-toed boots, hard hat, safety glasses, and gloves when necessary. For decontamination of this level of PPE, visible soil or waters shall be removed from PPE. This may be accomplished by brushing or washing in an equipment decontamination area, or establishment of a separate personnel wash. An approved personnel wash consists of a plastic tub containing clean water and a boot brush in which the water is changed daily. Higher level of PPE may be required depending on site construction activities. 6.3 Water Management Water resulting from decontamination shall be containerized in labeled 55- gallon drums or other appropriate containers. At a minimum, water samples will be collected and analyzed for PAH and PCP by EPA Method 8270. Water shall be handled in accordance with state and federal regulations based mi the concentrations of contaminants found in the decontamination water. Likely disposal options, depending on concentrations include permitted discharge to a metro sanitary sewer or treatment at a licensed treatment facility. VULC/-/9589-510 5 8 References Shannon and Wilson, 2006. Geotechnical Report, Seahawks Headquarters and Practice Facility, Renton, Washington. Prepared for Football Northwest, LLC. September 13. The RETEC Group, Inc. (RETEC), 2002. Engineering Design Report: J.H. Baxter South Property. Prepared for Port Quendall Company, May 2002. RETEC, 2005. Construction Completion Report: J.H. Baxter South Property. Prepared for Port Quendall Company, March 2005. RETEC, 2006. Engineering Design Report: Seahawks Headquarters and Practice Facility -North and South Baxter Properties. Prepared for Football Northwest LLC, October 2006. ThermoRetec Consulting Corporation (ThermoRetec), 2000a. Feasibility Study: J.H. Baxter South Property. Prepared for Port Quendall Company, April 2000. ThermoRetec, 2000b. Cleanup Action Plan: J.H. Baxter South Property. Prepared for Port Quendall Company, April 2000. ThermoRetec, 2000c. Feasibility Study and Cleanup Action Plan: J.H. Baxter North Property. Prepared for Port Quendall Company, April 2000. Woodward-Clyde Consultants, 1990. Draft Remedial Investigation Report, J.H. Baxter, Renton, Washington. Prepared for J.H. Baxter Company. December 1990. VULCJ-19589-5/0 ' I -, ,\ ~-• ......,:. r ·-·-, ,.. - ·-··'-._·-~-----"'-~-I -i.::.:--~· . .', . L _..J I u) .,. ;;y ./ \ ' ., I / .,/' ' i ~ ... ~ ·-·· I 1 •• I ; 1000 0 2000 .. --- TEC 1 "=2000' SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 SITE VICINITY MAP DATE I 0/05/06 D~WN E.M ./UKN FILE S!TE_VICI N I £AYOUT FIGURE I FIGURE 1 ' ' ····1 ! t: ~ c:: "'. "-• & '" ""'. 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I I 1 ~ ..-~ I I I ·:,~\.··I I _-, I VOOJTIZJ ,_ , r'HICKEF~~----/T~~SPHA~T;;:--,., ---- '-J-JYJ'Yl I r-j :a """">\ . ; "" .. ,4 4 • •4 .. ~ 111111111111111 I I I I I I I I I I I I~~ CONCRET[ SLAB CAP ~UBBE~IZED MAT OVER CONCRETE LA NDSCAPE CAP MEMBRA NE CAP GRASSCRE1E/GRASSPAVE SA ND FILTER PUBLI C j ACCESS PAV EME N T I I I 1 1 IY,I**'~ II "" !) ~,-~ . ' " ' " ''. " " " " " ' '-'/-~jj)::;t .'-'.iii' ,', ,-. ...: "·'-Pl '~r:cca, ~ I _ ~~~ _ _--=-___ _ }' '{ I , • I I I I I I I I I ) [ '> . ,.; ; '.. · 'a ;:: -~ '-I ---=--=------'<----~ -, S> ::::,..,.~-=----===------·-t ---¥ ~ ~t=:=--==:=-=-=·,4 --~" ~=====~~~~~ :::i" ~ ~ ~ Si :; SOURC E: SI -E DRA WINGS FROM Mr<A & CRAW FO~D SAND F ILTER SEAHAWKS HEADQUARTERS AND PRACTICE FACI LI TY CAP LOCATIONS t ~ 50 O 100 / ~ ~ RETEC r-..-.-I VULC1-19589-510 -" 1 oo· FIGURE 3 :,,,L..::=~~=~:..:==--------------------------------------~1_:=_:: ______ ..:..~ ______ f o~A~TE;:_:2;10~/~5!L/~0!6 __ J;o~R;:w:;::~·JE;;!.M~/S~EA;!_ __ L ______ ..J. ____________ __.~=---------- /1/e: J/".ll9!J89\5MPl1J9!J89XS!c_.'Jdwg !ayo/Ji: .S'MP IJCU!?F 4 Us'l?f.· ernarsfla/1 Pfo!ted: 0,;I 06, ?006 -!!:4!.Jam Xrf!!\·· ~ SYNTHETIC TURF 1.5" T~1.75" _lltltl~llUll.l.ltltlll,l.lltltlHl~.l.ll.~lll.~.~-lll.mltltlU.llU:l~.ll.l •. l.t.ll.·.U.J.l:.UJ... ~::~~~: :~::~: :~~ ;:NsD:~ SAND MIX Pf# tttWMffl WWI '":;,,·:::.,, ... :,~··-:,.,~ · · ... · · .. · · ...... ··· ·· ....................... · .. · ... · · .· .. FIBER-PUNCHED POLYURETHANE COATED 'fi~t~~ii~"-:~~::SF:::11:G (ASPHALT) _j_ . . .. . . ' . . ' ' {"-CRUSHED GRAVEL iu.i<fr-1 EARTH OUTDOOR ARTIFICIAL TURF FIELD SECTION INDICATOR FABRIC 1.5-TO 1.75" 8" . 1 . WOVEN FABRIC .-~. ~-'---FIBER-PUNCHED POLYURETHANE COATED :;_i_ '-CRUSHED GRAVEL , ' ~ CRUSHED ROCK LINER BEDDING INDOOR ARTIFICIAL TURF FIELD SECTION ~ ROOTZONE SAND ~ ">""'.:~":~\·::::,,-,:~:~~.~;".,:~:."::". "' ':~-~-~:c; .. ,c,~~ccc-,~,,"'' ":"~~";~"';"·~~~~"'~;"··"":::'":+,":.".""° .. ·"'~:~~.'~":.,:".~;,i,~ ::l~~::DBREAK (GRAVEL) ~ 3 ' ~~~ffg~~m~~~~~ ~~1~~~?~~~~~~~~:~1~E~N ~-t~' {/' -'~ -"'' }-, ,1-~~.,~' I;! '"?s •• '·c't\ ,~,'<,.. , o , o , o , • , , • , o .....__ SOIL CAP INDICATOR FABRIC -' 0 0 0 0 0 0 0 ' 0 0 0 ' 0 0 0 0 0 0 ~ CEMENT TREATED T ON SITE SOIL NATURAL TURF FIELD SECTION (WITH GEOGRID OR SIMILAR, AS SPECIFIED BY GEOTECHNICAL ENGINEER. THICKNESS VARIES) PEA GRAVEL .RETEC SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1-19589-510 FIELD CAP SECTION NOT TO SCALE o"m 10/5/06 DRWN: E.M.LSEA FIGURE~ file: H\ 195891 !9589XS(C5.dwg layout: SMP F!CUR[ 5 User: emarsha/1 Plotted: Del 05, 2006 -4:25pm Xrel's: .RETEC ~ T ~. T ~. ~ T LIGHT DUTY PAVEMENT SECTION HEAVY DUTY PAVEMENT SECTION PEDESTRIAN ACCESS PAVEMENT SECTION NOT TO SCALE SEAHAWKS HEADQUARTERS AND TRAINING FACILllY VULC1-19589-510 DATE· 10/5/06 DRWN: E.M.LSEA CLASS B ASPHALT CRUSHED SURFACE BASE COURSE SUBBASE COURSE INDICATOR FABRIC CLASS B ASPHALT CRUSHED SURFACE BASE COURSE SUBBASE COURSE INDICATOR FABRIC CLASS B ASPHALT CRUSHED SURFACE BASE COURSE SUBBASE COURSE INDICATOR FABRIC ASPHALT PAVEMENT CAP SECTION FIGURES File: H: \ 195891 J9589XS£C_5.dwg Layout: SMP FIGURE 6 User: emarshall Plotted· Oct 05, 2006 -4:25pm Xref's· l_ ....... r+.- '.:.:· \• ··,; ·::· :,/ .·) . • •C: .,' ••••••..• · , > · '·' . ' · · , ·, . ; · · ., ' , . : . • • · , .• ' ·. •.· · CONCRETE -~~;~SLAB l~cs,sarocAA~, -----I ~ _'-..._ EARTH CONCRETE SLAB SECTION INDICATOR FABRIC 1 " •·. ·. '·. ·. ..~ · .... ' ' . ' . . ' ---· ' '-..._ EARTH SIDEWALK SECTION INDICATOR FABRIC .RETEC SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1~185!J9.510 CONCRETE SLAB CAP SECTION NOT TO SCALE OATE: 10/5/06 I OR'tfN: E.M.LSEA I IFIGURE6 F/le: HI 19589\SYP\ !9589XS[C'_5.dwq Layout: SMP F!CURL 7 User: emorsho/J Plotted· Oct 05, 2006 -4:41pm Xre!'s. TREE PLANTER SECTION PAVEMENT TOf'S()jL LANDSCAPE SECTION CONCRETE CURB ASPHALT PAVEMENT OR CONCRETE SLAB OPEN APERTURE GEOGRID MATERIAL (INDICATOR FABRIC) f TMICKNJS VARIES ~ JO-MIL OEOMEMBIWIE N.QIL 30 MIL GEOMEMBRANE MAY BE REPLACED BY INDICATOR FABRIC IF IMPORT FILL AND TOPSOIL THICKNESS IS AT LEAST 36 INCHES. .RETEC NOT TO SCALE 20" MIN. 00 00000000 0000 00000 0000 0 0 o o <> o o o o o o • o o 'o o o • o o o o o • o o o o o o o • o o o o o o o o o o .-~-. o o o o o -CLEAN FILL t GRASSPAVE SECTION IMPORTED LAYER MAY BE REDUCED IF SOIL CAP LINER IS USED IN LIEU OF FABRIC SAND FILTER SECTION INOICATOR f,l,BRIC '"" ~ -,,e:: ~~%li,.~E~L5iJ.01h1PES '· LOCIITtD WITMIN THIS SOIL U.YER SOIL Co\P INDIC-'TOR FABRIC j T--"-""'""' """ Q • • • 0 " 20 • MIN O O a~ o o o o o o o o o o o o o o o o • o • -CL.D,N FU I ... ·;· ........ ~~~~~~· -~~~~1~~ .....•...... ~ '"'"''°' '~'" SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULCM9589-510 LANDSCAPE CAP SECTION DATE: 10/5/06 DRWN: E.M.LSEA FIGURE7 file: H· \ !9589'iSMP\ !9589XS[C5.dwg ioyoul: SMP FIGURE 8 U'ier: emorshol/ Plo!!ed· Oct 05, 2006 -4:4.?pm Xref's: 1 :::; ',-',_,) .'9'/~~11' ~.-0-..::.,.,-:~,..--,=.F,\;,.··,·~ .'l·>··~~fl;;, '~:, ,J{..X" ,1.:_~.f_r'.~~=.'_!-. 1~,-i{ ,·',.::~~'-"" ~ \-(,-~. -I_~.:?~-~r----\_.'.1-!_·, t~ 11"1\ ':_:.fl~ ~Ci--;-,"(_( 1'5li-:,. . -:;:J ~. ,"";,_}· -,,w ~-;,=: ..'. ;'--\ i .. " ,! ,"ft;.~ ';::~"{::.s ;f, -;._,_-~ I MPORTEO '!.--,a"f ',;;Y!/ -r-.. .J" I·-..'"' ~~''II' ' ' ' .. ~ I )',-_ ".I 1 ~,.,,, -r--.' ./"\' ' 'I.·,/ ,, I:,...··----/~ ·-~ '-(::/-'i'i.:. { ,.-=-,;t~-\/')>.,~-~·~:~, .. \."f<ftr',.;-<~'-> ), !': /\·~,--/, , -;!'i.~rt\{', ·-...,, 1 ,i\. i. <t)i~';~-~.c, ,._-FILL soi L 12" :t( ~;-· "5 ,--, •1 • -~ !;v ')I V'l'·0\ , .. -1 ~ ~ 1''r:"""-'. -+;-:,-11( I-;~ ~',',-1~ .,.,v.·i:.;:-., , ·"'....--lJ s -'.""\:-,':."'J ::_;11 :f. ,"/,·,,; ..... , '.. !:...1 ·-,),. -. ~---''\','; ,I /; • \~ '• 1-•, ,I ~ • ' 'I 1 -:_ • -, .\ ____:: ~' -t ~ill~ill ill ill,ill ill ill ill ill ill ill ill ill ill ill ill ill ill ITT ,Ill= .RETEC ~lli~lll~ll~rn~ffi~ffi~ll~lli~lli~lli~lli~lli~llil I I I I ! I I I 111 I I I I I 1'1111 I I I I I I I I I i I I I , 11 ik ~ EARTH NOT TO SCALE MEMBRANE CAP SECTION SEAHAWKS HEADQUARTERS AND TRAINING FACILITY VULC1·1958e.510 DATE: 10f5/06 ORWN: E.M.LSEA 30-MIL GEOMEMBRANE MEMBRANE CAP SECTION FIGURES Attachment A Letter from Ecology Note: Attachment A will be provided in the final version. Attachment B . Geotextile Note: Attachment B will be provided in the final version. Attachment C Geomembrane Note: Attachment C will be provided in the final version Attachment D Drawing Attachment E Restrictive Covenants This ATTACHMENT C RESTRICTIVE COVENANT NORTH BAXTER [Correct Recording Format To Be Added! DRAFf April 4, 2000 Washington corporation, its successors .and ~' am!3hii Stata:=::iif.::WashinglJUI __ ------------- Department of-4i4@jzji,..its succ~~ssigns ~ei:.!$.cology ,., tiittmdinbii#fu!E(her~emedial.Aetiim'') <iffi91ti'2H at ~perty that is 1) Pr~ve Purchaser Consent Decree, dated . These documents are on file at ---- resigjm! concentrations of certain hazardous substances which exceed the Model Toxics Control Act Method B Residential Cleanup Levels for soil established under WAC 173- 340-740. These cleanup levels are described in the Final Feasibility Study/Cleanup Action Plan for North J. H. Baxter Property, Renton, Washington, dated The undersigned, Port Quendall Company, is the fee owner of real property (hereafter "Property") in the County of King, State of Washington, that is subject to this I 5016J).t8 OJ Restrictive Covenant. attached. The Property 1s legally described as set forth in Eitlribit f, Port Quendall Company makes the following declaration restrictions, and uses to which declarations shall constitute covenants to run with the lano;::as:cpmvide<El5¥=law and sl'ialE=. _ foll<>Wmg-3BtplemeatatjQe--pf tbi?-Glwump Ac.tivAAmidfi'"<i:;\;lwi'ier shall not reduce, or rem6vi9t!Esoil caµ-re@ked by-,-be-£1eanup A-ef!&Hilan in a manner that may result in the JWW6lH-lr exposme-Ht-the elf5'!RIDil1ent of contaminated soil or create a new exposure path""!, I he..soitj:@:-requiredby the Cleanup Action Plan is described in the attached Exhihil )oi:\ cap maintenance is permitted without notice to Ecology so long as appl!tlmate health and safety protocols are followed. A Soil Management Plan will be prepared for Ecology approval that outlines specific protocols associated with future soil excavations, including health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options. In accord with the Soil Management Plan, limited excavation, utility placement or repair, minor site grading, or other pre-approved activities connected with site development and construction are permitted so long as appropriate health and safety protocols are followed and a soil cap that provides 2 protection from direct contact as required by the Cleanup Action Plan is provided following development. Remedial Action and continued protection of human health and tlj with\fiiiw, or allow others to withdraw, groundwater from the Property. Section 5. Following implementation of the Cleanup Action Plan, access shall be restricted to prevent swimming or direct contact with contaminated sediments at the south border of the Property. Section 6. Following implementation of the Cleanup Action Plan, residential use on the Property is permitted so long as a soil cap (as described in the Cleanup Action plan) is present that prevents direct contact with all soil that exceeds Method B Cleanup Levels. 3 $016)341.0l Section 7. The Owner of the property must give thirty (30) day adva~ritten notice to Ecology of the Owner's intent to convey a fee interest in a subs~io the Property. No conveyance of fee title in the Property shall be consililllnaled @bE=- Owner without adequate and complete provision for continucil§mBiilirnng .iiiif:: maintenance of the Remedial Action. Fee interests in.Jes~ sµ5stanliiil portioll::6£+----- the Property may be conveyed without notj_<:_e to ~y; -__ _ ------- Section li · the-Owner ~~le;ises to us=:amEictiviti=nsistent with righ~nter the Property at reasonable times for the purpose of evaluating the Remedial Action; to take samples, to inspect remedial actions conducted at the property, and to inspect records that are related to the Remedial Action. Ecology shall use reasonable efforts to minimize any interference and use reasonable efforts not to interfere with the operations of the Property occupancy. Section 11. The Owner of the Property reserves the right under WAC 173-340- 440 to record an instrument that provides that this Restrictive Covenant shall no longer limit use of the Property or be of any further force or effect. However, such an 4 S016Jl<II 01 instrument may be recorded only if Ecology, afler public notice and opportunity fo, comment, concurs. PORT QUENDALL COMPANY, a Washington corporation By: Its: ----=~--------- 5 Xl16J)'80J ST A TE OF WASHINGTON COUNTY OF ___ _ certify that S016D4103 IS ) ) ss. ) know ---- or have satisfactory (Signature ofNotary) (Legibly Print or Stamp N~me of Notary) Notary public in and for the State of Washington, residing at ______ _ My appointment expires _____ _ 6 ATTACHMENT C RESTRICTIVE COVENANT SOUTH BAXTER (Correct Recording Format To Be Added] DRAFT April 4, 2000 This Declaration of Restrictive Covenant is made pursJJan.§cr-~~Vi 70.105D.030(1 )(f) and (g) and WAC !73-340-440-byC:'l'orr::~Quendiill:C:C:ompany;3E== __ ------------·----· -------------Washington corporation, its successors and assr~ arid~ifiiic StateEWashingtO=:= ~riiedili§fuiroll=(herem~medial A~min"') oemrtreit at tl~roperty that is the s.i.ilijec_§f this Restriilive Cov®anL The ~~1mrconducted at the property is desenoedcin the folliiw.ing documents: I) Pros~ective Purchaser Consent Decree, dated rn resid_!!aFconcentrations of certain hazardous substances which exceed the Model Toxics Control Act Method B Residential Cleanup Levels for soil and groundwater established under WAC 173-340-740. These cleanup levels are described in the Final Feasibility Study for South J. H. Baxter Property, Renton, Washington, dated _____ _ The undersigned, Port Quendall Company, is the fee owner of real property (hereafter "Property") in the County of King, State of Washington, that is subject to this Restrictive Covenant. The Property is legally described as set forth in Exhibit A, attached. Port Quendall Company makes the following declaration as to limitations ---- restrictions, and uses to which future owners of any portion of or interest in the Proper:t'if11ereaficr '~OWi'ier-=f ------ Section 1. Without prior written consen8iEEcolo~ept a§lIDTI"ded belo.:w, ---------- following imRlementahon of the Cleiinu@ctiQrn'la~~~shall:rioEiller, modify, assogated with future soil excavations, including health and safety standards, soil stockpiling, analytical testing, and soil reuse or disposal options. In accord with the Soil Management Plan, limited excavation, utility placement or repair, minor site grading, or other pre-approved activities connected with site development and construction are permitted so long as appropriate health and safety protocols are followed and a structure or cap that provides protection from direct contact as required by the Cleanup Action Plan is provided following development. 2 Section 2. Any activity on the Property that may interfere with the inte~[¥ of th provided for in the Cleanup Action Plan is prohibited. and contemplates development of the Property as commercial) property. Section 3. Unless authorized ---------- --------- expom.;p_a.thway. IT]i(8;J~anu~n Plan p_eumts-amlcco]iremplates development and use 6£!hF.£roperty a.s:a:m1xed use:@idential, i'elai:F,=commercial) property. restf!l'ted to prevent swimming or direct contact with contaminated sediments at the Property. Mitigation actions required by the Cleanup Action Plan shall be maintained as set forth in the Baxter Mitigation Analysis Memorandum, which is an enforceable provision of the Cleanup Action Plan. Section 6. Following implementation of the Cleanup Action Plan, residential use on the Property is permitted so long as a building, or other structure (as described in the Cleanup Action plan) is present such that the residential use is located over structural 3 parking or other structures, placing the first occupied floor at least one leve~e ~ soil and prevents direct contact with all soil that exceeds Method B Clean.Jl.@vels. notice to Ecology of the Owner's intent to convey a fee interest in a ~s.tiiiifiafyort101t-i#----- the Property. No conveyance of fee title in a substantial,:portl'&Eof \ne=P-roperty shal~ consummated by the Owner without ad.<cg~1ate .ciinCF..cornplenEprovisimE!m' con tin . -----~- -~ ~-~ - monitoring, QQerat~and mai~~he RemediaE'A:ction;=mcludll!}-W mitigation gt'eperty may be use ~e Property that is inconsistent with the terms of this Restrictive Covenant. Ecology may approve any inconsistent use only after public notice and comment. Section l 0. The Owner shall allow authorized representatives of Ecology the right to enter the Property at reasonable times for the purpose of evaluating the Remedial Action; to take samples, to inspect remedial actions conducted at the property, and to inspect records that are related to the Remedial Action. Ecology shall use reasonable efforts to minimize any interference and use reasonable efforts not to interfere with the operations of the Property occupancy 4 Section 11. The Owner of the Property reserves the right under W A~-340 440 to record an instrument that provides that this Restrictive Covenan~ longe, instrument may be recorded only if Ecology, comment, concurs. PORT QUENDALL COMPANY, a Washington corporation ----------------------- DatecEUi1S= 5 STATE OF WASHINGTON COUNTY OF ___ _ certify that ) ) ss. ) know ---- or have satisfactory ~neli :=llili~ · 1s the person who appeared before meano=S.aJO' pen,.~ --· ·--- acknowledged that he/she was authorized to execute tjle,iilsfr1.ffiYent ancFacJfriowledgciEiE __ cc .. -------······----·---------------. ~~~--~-=·-·-·~ - as _________ of Port Quend~ Comp:any=to b~iliec:free am:l:;:y_oluntary=ac.t 6 (Signatun: or Noury) (Legibly Print or Slamp Name or Not.ary) Notary public in and for the State of Washington, residing at---------- My appointment expires _________ _ -----------· --------------------------------------·--··-- I E D I I I REFERENCE: I ... ---------,---, .. ------·-------------· ~ I "' " I I I I I + I I I ThermoRetec. Asso1ciated Earth Sciences, Inc. + + + 1'1'1'+ + + + + + + + + 1' I I I + • + + • I 'I.}, \ I * • • • +++1'+ + + + + + t +-++ .. ++ ... + + -f" + ••• * I (!) (§ w ••• @ ••• WH Q) II II II •• •• OF•@ II Iii A A ® .(§.·ai • • • EB • • •• F § • •Gl ®§®@ • BM ©•®• • • II (@) II Ill WH 111 8 "' F • • • II N 20 FEET -. ·-·------....... ---···-·--··-·----- / COMMON NAME SCIENTIFIC NAME PLANT SIZE QUANTITY '],'], -·------------,---------------..;_----------------~------ TREES LINE BUFFER ~ -~ SHRUBS 79 -=u --20 -~ --·-. -----,.--. ----.. 21 -- - EIMERGENTS '),,'), 40 PLANTING PLAN SOUTH BAXTER RE~1ED1ATION REI\ITON, WASHlt~GTON @ @ ® @ ~ © ® ® e ® (I) ® II • • • ~ t:·:·:·:·I ~ 888888881 kv vv vvj vvvvv Douglas-fir Douglas-fir western hemlock western redcedar Sitka spruce bigleaf maple bigleaf maple black cottonwood black cottonwood Oregon ash red alder Pacific willow cascara Pacific dogwood vine maple red osier dogwood hawthorn western crabapple Sitka willow hazelnut salmonberry Nootka rose Oregon grape sword fern snowberry twinberry salal lady fem slough sedge hardstem bulrush small-fruited bulrush water parsley tall mannagrass Pseudotsuga menziesii Pseudotsuga mentiesii Tsuga heterophylla Thuja plicata Picea sitchensis Acer macrophyllum Acer macrophyllum Populus trichoc11rpa Populus trichocarpa Fraxinus latifolia A/nus rubra Salix /asiandra Rhamnus purshiana Cornus nuttal/i Acer circinatum Cornus stolonifera Crataegus douglasii Pyrusfusca Salix sitchensis _ Cory/us cornuta ,_, , Rubus spectabilis Rosa nutkana Mahonia nervosa __ Polystichum munitum __ Symphoricarpos a/bus Lonicera involucrata Gaultheria shal/on Athyrium filix-femina Carex obnupta Scirpus acutus Scirpus microcarpus Oenanthe sarmentosa Glyceria elata .' •, 1-to 2-gallon 20 4' to 6' ball and burlap 15 17 20 9 16 10 26 25 52 25 62 5 4 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 4' to 6' ball and burlap 1-to 2-gallon 4' to 6' ball and burlap 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-to 2-gallon 1-_gallon __ 1-gallon 1-gallon 1-gallon 1-gallon 6-inch plug 6-inch plug 6-inch plug tuber or bareroot bareroot 43 96 10 11 117 51 189 48 95 _ -----• _:, _________ 'I 06 85 14 105 88 850 1350 475 800 350 NOTE: All willow and red osier dogwood shall have at leost 3 stems, Additionally, all Nootka rose shall have at least 4 stems. LOGS: A total of 5 logs will be placed within the created wetland, Each log will hove an average diameter of 12 inches at the small end and be at least 15 feet in length, Three logs should be partially buried as shown on the typical log installation detail with the other two logs being placed on the ground surface, All of these logs shall be conifers. A total of 15 logs will be placed along the shoreline of Baxter Cove or Lake Washington and/ or across the mouth of Baxter Cove. Each log will have an average diameter of 20 inches ot the large end and will be approximately 25 to 30 feet in length. All of these logs shall be conifers, SHEET L-1 DATE 7/01 PROJECT NO. KB99142A I i . 3" (COMPACTED DEPTH) SPECIFIED MULCH, KEEP 3"-6" AWAY FROM BASE OF TRUNK NOTE: SEE SPEC FOR MULCH REQUIREMENTS. ~ :,:..> <'> ;y a,; ~~ _, 12" MIN. 6" ~ 3" WATERING RING FINISH GRADE NATIVE BACKFILL TYPICAL CONTAINERIZED CONIFEROUS TREE NO SCALE 3" (COMPACTED DEPTH) SPECIFIED MULCH, KEEP 3"-6" AWAY FROM BASE OF TRUNK NOTE: SEE SPEC FOR MULCH REQUIREMENTS_ 3" WATERING RING -FINISH GRADE ~L...ae:::;;~ NATIVE BACKFILL ~ " 16' 0. ~ 13 0) 6" .-----t- MIN. 2X ROOT BALL TYPICAL CONTAINERIZED DECIDUOUS TREE NO SCALE ___. 12"r- MIN. 3" WATERING RING TYPICAL CONTAINERIZED SHRUB NO SCALE FINISH GRADE TOP OF ROOT MASS TO BE LEVEL WITH FINISH GRADE -COMPACT SOIL AROUND PLANT WITHOUT CRUSHING OR DAMAGING ROOTS -----MAKE PLANTING HOLE LARGE ENOUGH ONL YTO ACCOMMODATE ROOTS. DO NOT OVEREXCAVATE FOR PLANTING TYPICAL BAREROOT/EMERGENT PLUG PLANTING DETAIL NO SCALE --' .. - -~~---- PLANT 1' O.C. TYPICAL EMERGENT RHIZOME NO SCALE GRADEATWHICH TREE GREW IN NURSERY 3" (COMPACTED DEPTH) ---~ SPECIFIED MULCH, KEEP 6" AWAY FROM BASE OF TRUNK NOTE: SEE SPEC FOR MULCH REQUIREMENTS. REMOVE ALL BURLAP, TWINE ------- & WIRE FROM TOP 1/2 OF ROOTBALL AFTER TREE IS SET IN POSITION SCARIFY SIDES OF PLANTING PIT __ ___,, PROVIDE 2 (MIN.) SPARE LINKS TO ADJUST TENSION ; .. ~ ... ~;::;-· .. ·,.: ~ ,: .. - 3X DIAMETER OF ROOTBALL STA~:ING PLAN NOTE: STAKING REQUIRED FOR 5'-0" HT. ANO -IALLER TREES ONLY. ALTERNATE S1i\KING METHODS MAY BE ACCEPTABLE WITH THEAPPF:OVAL OF THE PROJECT BIOLOGIST. 3 STAKES MAY Bl: REQUIRED FOR TREES · --·· ----··-··-----------WITH-GREATEFtTl'IAM 3" CALIPER. ---··· #5 "CHAINLOCK" PLASTIC ,,----TREE TIES, ADJUST HEIGHT AS DIRECTED (SEE INSET PLAN) 2" DIAMETER FIR STAKES POSITION TIE WITH 1/2" CLEAR ON ALL SIDES OF TRUNK TYPICAL BALL AND BURLAP TREE PLANTING (CONIFEROUS AND DECIDUOUS) ----------- NO SCALE 15' MIN. FINISH GRADE TYPICAL LOG INSTALLATION.DETAIL NO SCALE l LOG------- / 5/16" GALVANIZED CHAIN {2,000#: MINIMUM STRENGTH); SECURE CHAIN TO ROCK WITH 112w X 8" GALVANIZED ANCHOR BOLT EPOXIED 6" DEEP INTO DRIUED HOLES IN ROCK; SCORE LOG AND WRAP CHAIN 2X AROUND LOG AND PULL TIGHT; SECURE CHAIN WITH 5/16" GALVAN1ZEDANCHORSHACKLE. LOG ANCHOR DETAIL NO SCALE NARROW TRENCH FOR LOGS; BACKFILL WITH LARGE ROCKS (2 MANTO 4 MAN)AS DIRECTED BY PROJECT BIOLOGIST AND BACKFll.1.. WITH TOPSOIL ~~ ---------- -·-.---- ',"-------TRENCH THROUGH LOWER SOILS AS DIRECTED BY PROJECT BIOLOGIST TO PLACE LOOS INTO OPEN WATER CONCEPTUAL LOG PLACEMENT CROSS SECTION (FOR LOGS BURIED AND/OR ANCHORED WITHIN SHORELINE) NO SCALE ANCHOR WITH 2-MAN TO 4-MAN ROCKS AND CABLE AS DIRECTED BY PROJECT BIOLOGIST AND ~~ BACKFJU. WlTH TOPSOJL NOTE: THIS JS A CONCEPTUAL REPRESENTATION ONLY. CONCEPTUAL LOG PLACEMENT CROSS SECTION (FOR LOGS PLACED ACROSS THE MOUTH OF BAXTER COVE) NO SCALE NOTE: THIS ISA CONCEPTUAL REPRESENTATION ONLY. cg----------------------------------------------------------------------------------------------------------------------------------------'---------------------"-------------------------------------------------------------------------------------------------------------~-----------------t ~ 0, ~ 0) C ., C " 0. L ! .n ~ ~ Associated Earth Sciences, Inc. PLANT INSTALLATION GUIDELINES J.H. BAXTER SOUTH PROPERTY REMEDIATION RENTON, WASHINGTON SHEET L-2 DATE 7/01 PROJ. NO. KB99142 8:-------------------------------------------·------------------------------------------------------------------------------------------------·------------------------- -------~~---s • ----•-----·---··---·-"'---•-•-•-• '-• --·-"••·~•a,,..-•------,·-~··~---·---y-·----~------------------•· -••-•-----··-· •·•-• -·-·--·------·-·----·--·-··----------------···------·---------. -·-----,-------------,------~- . . t ~ "fl TURTLE TRAPPING Prior to remediation activities, turtles currently existing in Baxter Cove will be live- trapped and rernoved to nearby areas in Lake Washington containing suitable habitat. Dispersal areas will be identified in conjunction with King County and Washington Department of Fish and Wildlife (WDFW) biologists. When remediation has been completed and Baxter Cove has been replanted, attempts will be rnade to capture turtles from the dispersion areas and return a srnall population (6-12 individuals) to Baxter Cove. TOPSOILS Imported topsoils should be a gravelly silt loam to a silt loam, rr1ixed with an organic amendment comprised of a well decomposed, humus-like material derived from the decomposition of ,grass clippings, leaves, branches, wood, or other organic materials. Soils shall have an organic content of at least 30o/o. The organic amendment shall be produced at a permitted solid waste composting facility. The topsoil and organic arnendment mixture shall be clean of debris and rocks larger than two (2) inches in diarneter. LOG INSTALLATION Following remediation, large, downed logs will be placed within the perimeter of the created wetland that will be planted under this mitigation plan. Additionally, logs will be partially buried and anchored along the shoreline of Lake Washington and at the mouth of Baxter Cove. Lastly, logs will also be floated across the mouth of Baxter Cove. Logs to be placed within the created wetland will have an average diameter of 12 inches at the small end and be at least 15 feet in length. Approximately one-half of the logs to be installed should be partially buried (see Sheet L-2 for typical installation) and the other half of the logs should be placed directly on the ground. The final locations for log placement will be field located by the project wetland biologist and/or engine,er. Logs to be placed alon1i the Lake Washington and/or Baxter Cove shoreline will be partially buried and/or anchored within the shoreline itself (see Sheet L-2 fortypical installation). These lo!gs will have an average diameter of 20 inches at the large end and will beapproximately25 to30feet in length. Logs to befloatedacross the mouth of Baxter Cove will be of similar dimensions (see Sheet L-2 for typical installation). The final locations for alt log placements will be field located by the project wetland biologist, fisheries biologist, and/or engineer. MULCH Cedar grove medium grade compost mix, or approved equal, uniform in color, free from weed seed, sawdust, and splinters. Mulch shall not contain resin, tannin, wood fiber, or compounds detrimental to plant growth. Source shall be from freshwater mill. SEEDING and shrubs of a size reduced from those specified will not be permitted unless approved by project wetland biologist. Plant delivery shall be as close to plant installation as possible to avoid extended storage of live rnaterials on-site. Plant materials shall be packaged with care for transit to the mitigation area. Branches shalt be tied back, and bark shall be protected with burlap bags to prevent damage frorn chafing by ropes and wires. Plants in storage shall be protected from weather and packed to provide protection against climate and breakage during transit. Do not drag plant material •Nithout proper root and branch protection. Lift containerized plants by container. Do not drop any plant materials or damage root system. PLANT MATERIAL SOURCE The following are acceptable sources for each particular type of plant material: Emergent Stock Propagated and grown within a local nursery (western Washington lowland Puget Sound region). Collected (or harvested) 'JVi!hin land owned or leased by a nursery, if such land is used for the purpose of plant propagation and/or storage. Collected (or salvaged) from sites that are going to be destroyed by legally permissible construction, and only when a permit has been approved and issued by the local jurisdiction forsuch construction. Obtained from sources 1,vilhin the lowland Puget Sound region. Trees and Shrubs Local nursery grown plants will be accepted. Plants are to be derived from stock acclimated to ·.vestem Washington environmental conditions, having been consistently cultivated and grown under similar conditions. PLANT QUALITY Trees and Shrubs General: Plants shall have all leaders and buds intact. Trees shall not have sunscalds, disfiguring knots, fresh cuts of limbs, damaged leader, or deformed trunk. Container Stock: Provide container stock grown in container long enough to provide a root system that reaches the edges of the container in which it has grown. Shrubs shall be.well rooted and shall have sufficient root rnass to hold together the soil, in which itis growing, when removed from the pot. In _addition to the planting of native plant species, a seed mixture cornprised of · Bare Root Stock: All bare root stock shall have heavy fibrous rootsystams. Unless creeping recffescue (Festuca-ruora/(55 percenfoy-we1gntJ~ oiueJoinffeeogras_s __ -·otfieiwisif apprc:ivea oy proJecfwellario oiologrsrand/or lanascape architect, a11·· ( Calamagrostis canadensis) (30 percent by weight), and redtop (Agrostis alba) ( 15 bare root plants must be dormant at the time of planting. percent by weight) shall be hydroseeded throughout the created/graded areas. This seed mixture should be a applied at a rate of 20 pounds per acre. As directed by project biologist, areas of wetland creation may also be hand seeded with species such as salmonberry following the planting of other plant materials. PLANT MATERIAL General All plant material shall be of accepted size standards as specified in American Standard Nursery Stock (latest edition). All plants shall be of normal habitat of growth, and shall be heallhy, vigorous, and free of disease, insect eggs, and larvae. Scientific nomenclature shall conform with Slandard Plant Names, latest edition. Names not present in this listing shall conform to accepted scientific non1enclature in the nursery trade. For trees and shrubs, no less than 10 percent of each variety or species shall be accurately labeled. For emergents, each container or bag shall be accurately labeled. Plant materials shall have durable, legible labels stating the correct scientific plant name. Size, quality, and quantity requirements shall meet the standards listed in the Specifications and Drawings. All plants shall be at least equal to size specified on the mitigation plant schedule. Oversize plants are acceptable, but without an increase in 1he contract ptice. Trees Emergent Stock General: Emergent stock shall support a section of rhizome or tuber of sufficient dimensions to support the growth of al least one plant within the first growing season. PLANTING General Only personnel experienced in the installation of native plant materials shall perform planting and all planting shall occur under the direct supervision of a qualified supervisor. Adjust plant locations as necessary to best meet post-grading conditions. Planting locations will be checked by the project biologist prior to and/or during planting. A biologist from the design team shall be on-site for the planting. All plants will be planted during the dormant season (i.e., November 15 through March 1) unless approved by the project biologist. Planting of woody plant materials shall not take place during freezing weather or when the ground is frozen or excessively wet. Planting of emergent plant materials shall not take place during freezing 'Neather or when the ground is frozen. Once accepted on-site, all plants shall be protected at all times from animal damage, vandalism, drought damage, frost damage, and wind damage. Plants that cannot be planted within one (1) day after arrival at mitigation site shall be "heeled-in" or otherwise stored temporarily in accordance with accepted horticultural practice in a manner that does not compromise the health of the plant material. Plants stored under temporary conditions shall be kept moist and protected frorn extrerne weather conditions. Plant stock shall rerrtain securely wrapped and protected; shall be stored in moist sawdust; and shall be kept cool, using cold storage if necessary. All plant pits shall be excavated with vertical sides. Weeds, if any, within the vicinity of the planting pit shall be scraped out and disposed of appropriately. The bottom of all excavated planting pits shall be scarified to a depth of 4 inches and the sides of the pit shall be roughened. The planting contractor shall form 3-to 4-inch high, hand compacted earth berrr1 around each plant for use as a watering basin. The radius of the \Vatering basin is to be equal to at least the height of the plant. After plant installation, place a minimum 3 inches of an organic mulch within the basin around each plant. All plants are to be watered within 24 hours after planting. Containerized Plants The rootball of all containerized plants is to be thoroughly soaked ptiorto planting. Excavate a planting hole twice as large as rootball. Remove plant from container with rootball completely intact. Insert rootball into planting hole without bending or damaging the roots, and place root collar at finished grade. If container stock appears to be rootbound, slash roots vertically with a sharp knife along the outside ofrootball in three (3)places minim urn before planting. Use moist, pulverized, native soil for backfilling, ensuring that good contact with rootball is made. Frozen or muddy mixtures shall not be used for b.1ckfilling. Midway through the backfill process, water thoroughly to settle soil. Complete backfill at finished grade and ensure the plant is at proper alignment. Water again to settle soil and add additional backfill as necessary if roots become exposed. Construct a circular, 3-to 4-inch high, hand compacted earth berm around each plant for use as a watering basin. Place 3 inches of organic mulch within watering basin. · Sareroot Emergent Plants . · Prune brokenroqtsasnecessarypriot"toplanting us1nga sflarp instrument. ___ _ Make a "V" -shaped planting hole in the soil of a sufficient size for root system and insert plant so that root collar is at finished grade. Roots of bareroot plants shall be spread and arranged in their natural position. Roots shall not be matted together as the pit is backfilled. Avoid "J-rooting". Rhizomes and Tubers Rhizomes and tubers shall be firm and free of rot. At least one shoot for each rhizome should be aligned at the surface, with the bottom of the rhizome covered by at least four (4) inches of soil planted 1' {1 foot) on center. The planting area must be very moist to wet. IRRIGATION Prior to plant installation, the planting contractor shall install a temporary irrigation system. The planting contractor shall design and construct a terr1porary systerr1, including heads, valves, backflow preventor, and controller. The irrigation system shall be maintained by the planting contractor for one growing season. Additionally, costs incurred for water during the irrigation period shall be borne by the planting contractor. Planted materials will be irrigated 1 year afterinstallation by planting contractor. All planted materials shall be watered during the dry season (June 15 to October 15) as necessary to keep the plants healthy, to prevent plant wilting, and to promote deep plant root structure (i.e. 1 inch water per week). The planting contractor shall submit a watering schedule for approval by project biologist before the irrigation systern installation is approved. All permits and inspections necessary for the irrigation system shall be obtained by the planting contractor. The planting contractor will be responsible for securing a source of inigation water. PERFORMANCE STANDARDS/GUARANTEE PLANTING CONTRACTOR Plants shall be guaranteed for one year against defects of rnaterials and workmanship. The Guarantee period begins after the date of the provisional accepta~ce of plantings. Final acceptance will be certified in writing. The planting contractor has the right during the entire warranty period to enter upon the property for inspection and curative treatment of any material needing such and which are still under warranty. The project owner shall be notified in advance of any corrective treatment measures so as to arrange for convenient access to the area. A 100 percent survivorship of newly installed plant material, after the first growing season, is required under this guarantee. Specified plants shall be replaced with plants or species and size as indicated in plant schedule, and according to planting details on plans unless otherwise directed in writing by the project wetland biologist. The presence of waterfowl and aquatic mammals within the project vicinity, and the potential for foraging damage to planted emergent species, may make the 100 percent survivorship guarantee difficult to achieve. Relief from this guarantee will be provided by the owner if forage damage cannot be reasonably controlled. The contractor will be expected to re-set settled plants to proper grade and position during the guarantee period. Restore raised soil water basin (if any) and adjacent materials. Remove dead material. The contractor should correct defective work as soon as possible after deficiencies become apparent and weather and season permit. Tree and shrub material that is greater than or equal to 25 percent dead or disfigured will be considered dead and must be replaced at no additional charge. A tree will be considered dead when the main leader has died back or when a minimum of 25 percent of the crown leader is dead. Any emergent rhizome, tuber, or plug that fails to support the growth of at least one plant during the guarantee period will be considered dead. Plants will be considered disfigured when excessive dead wood has been removed or when the symmetry or typical habit of growth has been impaired by the removal of the dead wood. The planting contractor shall replace trees and shrubs when plants are no longer in a satisfactory growing condition as deterrr1ined by project wetland biologist for the duration of ihe guarantee period. Replacements shall be made within seven (7) · --uaysofnotificat1onfrom-ptoject wetland biologist, unlll"SS otherwise apµroved by· the project wetland biologist. After each replacement period, if any, the planting contractor shall submit a marked planting plan showing the location of each item replaced at that time. Replacement plants shall be marked with colored survey tape, and shall be guaranteed for one full year following planting. MAINTENANCE The Owner will be responsible for the following maintenance to be perfonned during the 10-year monitoring period in addition to the planting contractor requirements: -All woody material must be weeded to dripline every spring during the monitoting period. -All invasive plants must be removed twice every year within the created wetland during the monitoring period. -All weed control work is to be performed by hand whenever possible, and with the lightest possible equipment where use of equipment is imperative. -Pioneer species (e.g., red alder) must also be controlled as necessary to avoid unwanted competition with plants installed in the mitigation area. -All debris and removed invasive plant material must be removed from the site during every weed control visit. -Irrigate using the ternporary irrigation system as necessary after Year 1 to establish new or replaced plantings. MITIGATION PERFORMANCE STANDARDS Please refer to the May ·J4, 2001 Engineering Design Report prepared by ThermoRetec Consulting Corporation for the mitigation perforrnance standards and monitoring schedule information for this project. CONTINGENCY Appropriate contingency plans will be developed as necessary during the 10-year monitoring period to correct problems identified during monitoring. If plant survivorship does not meet the established criteria, replanting will be conducted after the reason for failure has been determined (e.g., poor planting stock, moisture regime, herbivory, disease, shade/sun conditions, hydrologic conditions, vandalism, plant competition, etc.). _,, --... ----"-· ------·----. -·------,----' --·--------.. ---·-·--~-. __ . _____ ,. _____ ·-----·---------,---,----------· ----,. . g''------------------------------------------------'------------------------------------------------------------------------------------------------------------1.i----------------------------------------------------------------------------------------------------------------------------------~-----------------------~ ~ 0) gi 0) C: 'E "' a. ~ fi "' ..a ~ ~ Associated Earth Sc:ienc:es, Inc. SITE PREPARATION AND MAINTENANCE NOTES, MITIGATION GOALS AND PERFORMANCE STANDARDS J.H. BAXTER SOUTH PROPERTY SHEET L-3 DATE 7/01 PROJ. NO. KB99142 RENTON, WASHINGTON 8l-------------------------------------------------------,----------------------------------------------------------------------------~----------------------- I p N M L 1 K- J H G1 ,--CORRUGATED METAL 7 PANEL OR EQUIVALENT ~-PAINTED FIBER CEMENT BOARD OR EQUIVALENT SHINGLE PATT. ,,--PAINTED STEEL OUTRIGGERS OR REVEALS IN PANEL .---TRANSLUCENT DAYLIGHTING PANELS OR EQUIVALENT A7 A407 @ @ ® -,:----30'-o" ~-~i'----:50'-o" ---/---30'-o" --~---30'-o" -- Al3 A408 ® 0 ® 0 0 0 0 ----i'~---30' -o" ---,~--30' -o" --~---30' -o" --~·"; ---30' -o" ---"'·----30' -o" --~----30' -o" ----;,. ~--30· -o" ----,.;~L • ____ , -------- f------i----.../----,,~,---------rr-,,----,'/'---,,-f,,----'\------,,-,-r~-------,,-,,--r-----,i~r,------,,-,,----j----rr-n--------,,-,,-------1·,---"-------rr~~------"~,---------~,T----t--l I r=:--1= t=i=======-.. t=====•• --t=;~·==== ·:. 11 1111 11 WEST ELEVATION scale: 1/16" ~ 1'-0" I ! l ·-~C-Li---.... ----· . .......... ... ·,.=· =·· =====-=====····=· =··=·· =···=···=·· _ , ___ _ ·--===1=== [--·· ...• •... ... . . . .. -t I BDBDB :· ,JB .... ..... ...... 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CRAWFORD ARCHITECTS, LLC 1901 main street, suite 200 kansas city, mo 64108 tel: 816.421.2640 fax: 816.421.2650 Cl) ~ s ro ..c co Q.) Cf) ·-C ·-ro !.... I- _J _J <( co l-o 0 u.. consult:mts z 0 I- (!) z -I (J) ~ -z 0 1-z w 0::: " C 0 " " E n " ~ C 0 -~ 0 C key plan DEVELOPMENT Pt.ANNIN CITY OF f'IENTO/ l G SEP 2 2 2D06 fll:Cel\/EO 15 SEP 2006 seal. project no: drawn by: issue date- BUILDING ELEVATIONS drawing title: A301 sheet nu.: p ''-.,, N L K J G F E D B RE: L 100 (FIGURE 9.1) INFORMATION FOR LANDSCAPE & HARD SCAPE '~ ,,~ ~ M ''y ~'?'' '',, ~,''' ";.z, ·, --f-\-~' ~~'"'" "--}-'----s e•"' ( i i / EXISTING POV11ER·· POLE LOCATION SOUTH FENCE PROPERTY LINE PSE EASEMENT LINE (TBD) EXISTING POWER POLE LOCATION CURB-----~ NEW 1-STORY MAINTENANCE SHED • \ ' 0 ' ,, ! I I ; ! ! i l . \ A l ;; \ \\ " s.{\ \\ ·~ COVERED CAR WASH PA~ ! EXISTl~~G POVvER POLE LOCA,TION ----~r·_'" PSE ELECT. LIF-, STATION I I \ 2 "T I • 0 / MAI NT. PARKIN G--__!:_ .. ::::::._:::::Ji~--1 i ' ' . ' 4 ST ALLS I /,. SECURITY GATE "" "· " "'· '~ -------" LAKE T ND --- ~ F ____ __c___ __ _c ____ ---'1 • ,- GRASS E-----~<:;11PfAIT~+---i;2 SURFACE -~ I: F 80-YARD F:IELD NATU~AL GRASS PRACTICE F 1 6' 4~----0.-1 7 2 '-0------'.~.ll 1 7 2 '-0-----_; F • • 0 EXTENT Q[_AfillF.!QALJUE£. _____ 1 20' -----·------------------' I I r· '"'*''"•• . \ \ • -"'• • r··· •• i i j ' • ~ARTIFICIAL T'tJRF''__/ PRACTICE FIELD\ '''"",l h / _,.,.~··"·~-"'"'"' "''"'''"'-,,""'", ' ,,,L_\ , "-· I • SAND FILTER & WORKOUT AREA I --v. le---~"·"= ""·" ·"·,~ . ··"",.,~--1 '.:---=-= L_,.~L ________ __,\\,-.,~·-·'--420 '---f------------,lffi N 0 WAS:~ NGTON NOTE: OHW= 18.8' (NAV088) (NGVD29) OR 15.2' . ' 100 YEAR FLOORDPLAIN WA. O.H.W.M. AT LAKE 1~ LIMIT OF PUBLIC ACCESS -- "--~' SCREENING TRUCK ............... ASSEMBLY " p--1 r=. .. .,, "'" e••""" e• • '" "'""'' "'' ' • jf ./' \ • • ! • ! • ____ .. --eou ~ -------- @ --@ ® ' -EXISTING BUILDING STRUCTURE TO BE PUBLIC ACCESS 1 0' 4' ACCESS WALK -SECURITY FENCE -16' SERVICE ROAD '~.--------_../ \ i I -~-~~i---s:=======·==~kt.-""""'::..-... :-::=:::i -__ .... _____ _ 1 --- "--SECURITY & FENCE GATE '~'" "m''-,,, '"''"'"' ... ,. "'"'" '" '" "'""'' :J:i "',. r··· --I/ I , . • _,,;,.,-,-·""'' ""'" ,%m, """ '"" "'" """" """"'''\ • '""""""'" '" "" '""'"'-'"'""'"""'*"'" """ ""m••••"''"'"" / ,, ' p '/ / ' , . """""'" '""" / ," "'"". -~""" """ ------------------------------------------------------------------------------------------------~------------===------~--====="c--~·:_ __ """~::_ __ ::::0~-\---~:::0---------------------:cr',::", ____________________ :_':_ _______________ ;:::...,· '"''""'""·~·"· .... """"""'"'" .,· ' .. , -=·::::::.:=.:·::::::··· .. ) 4·· .. it i, ""-'~"' ------------------------------------------------ NOTE: STREAM CLASS LAKE WASHINGTON GYPSY SUB BASIN CLASS 1 DRAINAGE '"""'·"········· ..... , ·-·"'" CLASS 2 (RE: FIGURE 8.3) PARKING COUNT GENERAL SURFACE SECURE TEAM PARKING PARKING TOTAL . "" ""'"". """ """"" ""'" """""""'""" "' "" "" '". ,, . \ ~ ' ' \ 195 104 299 STALLS STALLS STALLS PROPOSED RAILWAY ------- CROSSING --------------------- o so· 1 oo· ~ -~ 19 ~ ~%4.Th.B'm §l 2'-\0,t\:R,~'%11 s.P'1t s,;1;h't~2sD%< p N M G C B A-J-----------------------------------------------------------------------------------------------------------------A- A1 SITE PLAN scale: 1" = 50'-0" © 2006 CRAWfORD ARCHITECTS. L.lC © 2006 CRAWFORD ARCHITECTS, ll.C .... ..-----·----.... _ // ........ / '\ -----, \ I / .. \_ _________ ~\ ' ' i r t : 6 Fl fi::11)%1 I? ©l Fil [91 ' . \ \ , ...... ,-7 ' / ' \ ···-~----/ \ , ' ,, ·-.. ... ........ ,.../ ··-·--------- CRAWFORD ARCHITECTS, LLC 1901 main street, suite 200 kansas city, mo 64108 tel: 816.421.2640 fax: 816.421.2650 (/) ~ s co ..c co Cl) (/) z 0 5 -' a. !1c I- ~ LU a. z :"i a. Cl'. LU l- at "' Cl'. Ir z :"i a. LU 1- U) ·-C ·-co !..... 1-- _J _J <( co l-o 0 u._ SEP 2 2 2DD6 RECEIVED KC045-05 CRAWFORD 15 NOV 2006 1 :50 SITE PLAN COtlSUltants z 0 1- (9 z -I (f) ~ -z 0 1-z w 0::: key plan project no drawn by: issue date drawing ti~e A001 sheet nu.: p N L J H F E D B 0 I ·, I © © ® © ® ® ® 0 ® Q ® 17 ® I I I, I I I I I I ! 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TRACKS -,-,-- ---------~1·--'--············ ... ... . ............... :-.. ---........ . © ' A ' : 1 i I 30'-o" ---)/~--30'-o" --~'i'--~ 30'-o" ---ii~--30'-o" --~L-- I I / 30'-o" ----,/~--30'-o" ---}/~--30'-o" ---)1~--f' 30'-o" ---)/~--30'-o" ---)/~--30'-o" --~l'- 1 I I ! c,i'--1 --30' -o" --~:i--- i ! 30' -o" ~~...,_-i'ecc~~,,,p~E~,._ __ ........................ . <D 0 ............... -....... . --R.R. TRACKS I ...... ...... -·········-·············· •·•·· TRANSLUCENT DAYUGHTING I 3 DEG. 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I -l I I ' ' ...............•.......... ...... . ..... • I ---1 I J -- I , I ' 1 ........ -..L PA)NTED STEEL OUTRIGCER -;---1 I I , I r--j-ff--...L, FRAMING SYSTEM PROF1LE P9R IPF SUBCONTRATOR I .i I Al ---- A705 ,-SEAHAWKS LOGO ' I I • •••• I ••• ••••••••••••••• ..... ..... ..... ••• • •••••••••••••• I GLASS NTRY -1-. ......................... , .. ..._ ..... ~ .. COVERED ODD I " lfaa-1'!1 PE GOLA --~ MAIN DOOR -,\"" 1-aaa ..... t·· .... ~~ ................. 1 ..... ~":. ;:· .. . ····· I ··················· ..... ..... . .... - 0 I 0 N O.H. COILING DOOR I I F I ,_ ........... ·--"'·--------+--i---'i----....l.i,,I....L..i-.......i....J....1...1,+L-i.........l.....i....-+--.i....-.;,_;-....;;;=.:. ....... -·.,.' ---... --i----+...._-...... -+-~~------+--+ ....... "".""""--t ..JL.......L....L. I I I I ~fNEERLj ~~f~NJ~g~~~ _...I~ wooD coJuMNS FOR covE ED p~;!:s A~~ :; =~ D i~= METAL CABLE LATTICE SYSTEM COURTY, RD __, FOR VEGETATION SECUR TY __, LANDSCAPE STRU TURE FOR IVY W LL __, -~---------------------150'-o" ----------------------;f--, (FOOTBALL FIELD) 204' -0" CLEAR GI 402 j I ............. ! ....... . I I ~-----so'-o" -----~ ~ I~ 'I' ~ --------SPANDREL ;;Ii(: FIBER CEMENT BOARD OR EQUIVALENT MASONRY CLADDING OR EQUIVALENT AT PIER FIBER CEMENT BOARD OR EQUIVALENT SHINGLE PATTERN LAKE WASHINGTON "--SCREENING ASSEMBLY ' <D I "" "' I ...... + ' 0 I 0 N I __ =LEleiVii'EL'-E3,._~4)11i'. '} 59·_5" '1' ' 0 I st ~ ' 0 I "" LEVEL 2 $· 45'-5" LEVEL 1 $ 27'-5" LEVEL 2 $ 45'-5" LEVEL 1 $ 27'-5" p N M z z {Do K:mm::s::m:m: Cf) w 0 C B -~---------------------------(INSIDE) ------------------------~~ C A-1----------------------------------------------------------·-------------------------------------------------A- A1 NORTH ELEVATION scale: 1/16" = 1 '-0" ' . 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I ,\ ,, F IL T ER I ,1 ,1 WII//IIIJ ~ '-,~-----' . --\ ~--.. \ \_ , --/ ---· ""1----------------------------------------------------------'------------------------------------+---t-------------------------------------,------------------J ~ '.1· '.J L-------------------------11------------+----=-------=-----1 G' -, SOURCE: S ITE DRAW I NGS F ROM MKA & CRAW FORD " CONCRETE SLAB CAP RUBBERIZED CONCR ETE MAT OVER LANDSCAPE CAP MEMBRAN E CAP GRASSCRETE/GRASSPAVE SA ND F I L TE R -- PUBL I C jACCESS PAV EMEN T 25 0 50 SEAHAWKS HEADQUARTERS AND PRACTICE FACILITY CAP LOCATIONS ETEC 1 "=50' VULC1-19589-510 DATE: 10/5/06 DRWN: E.M./SEA FIGURE 3 ,_ ' \