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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
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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
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Prepared by: .. ( .,·, . ., ,, ,>
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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
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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
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VULC1~19589-510
UTILITY LOCATION MAP
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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
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BAXTER
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• ...
.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
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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
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!ACCESS
PAVEMENT
6
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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
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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
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~----, STORMWATER CONTROL FACILITIES SHOWN ON THIS DRAWING ARE
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om 10/4/06 loRWN, E M./SEA I l FIGURE 4-3 I
--------------
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WELLS TO BE DECOMISSIONED
DATE: 10/5/06 ORl',t,J: [.M./SEA FIGURE 4.5
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PRACTICE FACILITY
VULC1-195B9-510
DATE 1 O/~L06 DRWN: E.M.{SEA
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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
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PRACTICE FACILITY
VULC1-19589-510
UTILITY TRENCH CONSTRUCTION DETAILS
t DATE: 10/5/06 DRWN: E.M./SEA ----FIGURE 4-9
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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
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SITE DRAWINGS FROM MKA & CRAWFORD
!lG·RETEC 30 0 ~-.
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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
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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
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VULC1-19589-510 ! L1:-:7:~:...:R.::E:T.:..:E::(:._ ________________________
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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
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IN THE SUPER10R COURT OF THE STATE OF WASHINGTON
IN AND FOR KING COUNTY
8 STATEOFWASHINGTONDEPARTMENTOF
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ECOLOGY,
v.
Plaintiff,
PORT QUENDALL COMP ANY, a Washington
12 corporation,
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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
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26
PROSPECTIVE PURCHASER
CONSENT DECREE
North Baxter
11 ATTORNEY GENERAL OF WASHINGTON
Ecology Division
P0Sox40ll7
Olympia, WA 98504..0117
FAX (360) 438-7743
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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.
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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
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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
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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
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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).
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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
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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
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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
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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
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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
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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
··········~-------
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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
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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.
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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
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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
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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.
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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
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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.
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PORT QUENDALL COMPANY, a
Washington corporation
PROSPECTIVE PURCHASER
CONSENT DECREE
North Baxter
:dt.,-. I
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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
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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
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IN THE SUPERJOR COURT OF THE STATE OF WASHINGTON
IN AND FOR KING COUNTY
8 STATE OF WASHINGTON DEPARTMENT OF
ECOLOGY,
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v.
Plaintiff,
PORT QUENDALL COMPANY, a Washington
12 corporation,
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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
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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)
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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
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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.
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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
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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
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13
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15
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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
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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
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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
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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)
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• 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)
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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.
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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).
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Stonnwater Pollution Prevention Plan
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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:
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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.
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• 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.
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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
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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
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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
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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.
VULCJ-19589-510. 7-1
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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
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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~~)_-=
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1----'~'----+-~'-'~oo~ ___ ---;o,.oo=s -+--'"'--""''"'oo"--+-":c·_:_"c-94:-_---1_0.,_.,.oooo"""-l---'o".oooo="--+-' --"-"-c:"'"'''"''--l--'o'".oo""'-'49 o.oooJ o.o o.o 1----'~'---+-~'~-""~1_ -I--'o'".oo~s---l--"o~-"-'-'CHJ"'-----l-~o'-'.r"3'-93'---+----"""-oooo=,_-+-_o".. . .,.oooo""''--+-~""-""1~2,_1_1--;'c:-OOC'-'5'-J_f--~o"-000""'=4.__-t-_"o"o'---+-----"o"_o,_ _
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1
0.1811 0.0000 0.0000 0.0610 -~ o.oon 0.0005 0.1 (fo __ _
~--~~ ·-·~ _ -J'S-~00~--+
1
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------2~ .. ---3~66~7~--1-----"0,_,00-"6"-----+!----'0~-0,_.l-'l'-9_-I-I _ _:O:-c-~21~0c-9_+-_0c,-,c0000'°"'--1--"0~-0000::c:c"-----''--0".:-CCo'i~j~j::::::;:::jot.oo:fJs"-3,_ ____ t-f---~"of.0006jf~:::j;:-::::::io~-~!:::::::::1---on-
---;"-:---+--'-'-"'"'33'----1-----'o". oo~, --l--""-""-''-'1~,----t-----""--:'-;"~''--+----"""-0000=,_+-_o'". oooo="'--+---'"""-::'-'c7 'c:----1-----"""'-oo"•:c•c_-t--"'"·"'ooo"'-',-l------'o;,· 1 __ . -+---"~' ---< 25 4000 0.007 0.0139 0.2388 0.0000 0.0000 0.0975 0,0102 0.0007 0.1 O.l
----"'"-:---+' --'-4-',16".7'----1-----'o".00~7--t-_o"_o,_,'-"39 --+----:c".;",:,'~'~--1-----'0.c:OOOO~._+---:O"'.OOOO~".--+-':O--:.locOS,_O,_-t-----""-"""'o",-+-~"c:-OOO='--'-f-----'o.1 o. 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--~~,,'----'--{
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---_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
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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
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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
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0
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0
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0
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6
15
7
8
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_ _ ___ 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. 'oo·"'n -" 0.0143 1.2ss1 o.0338 _,_,~·~oo~,~'-+-~1~.0"'3~'~'-'-~o~.oc140-'-'---1-o~.00=2~•--+-._o~.J'----f----_o~.~J _-_--_
69 I I 333 0.007:2 0.0143 1.2696~--1'-o~.O~J-'-62~ 0.0024 1.0538 0.0140 0.0025 0.3 0.3
--:---.:'c-"--t--c-1 c'1.s,;oo~-+--.:"cc·oo~n:--+-oic.-:Co~1•c:i-+---+1.oi2,:c'i•,~+----:"~·""J8:;;7~_--+-_,_o~.oo='=•._+-~1.~o•='~'-+-~o .... 0~1~40~+~"·"'00~2=6'---+--0=.~J_-+_~o~.J_-<
11 11.667 o.oon 0.0143 1.2983 0.0412 ,_~0~00~2=s.__,_~1.co,~1~,-+--'o~.0=1~40~_,_~o~.0~02~6'----+--~o.~,_--1_._o~.J_-<
72 11.833 0.007:2 0.0143 1.3126 0.0438 0.0026 1.0959 0.0141 0.0027 0.3 0.3
f--~,~,--+1-~1,~.ooo~-+--io~.o~o~,,:--+-o"."0~14c:J-+---:-1.~~~~,~,'::.=-=,-1=_--'~oj.oj46t,-:_--10-__:~00~~00=2~1_,_~1~.1~100~---1-o=.~0~1,~1--+-~o~.0~0~2~s_,___,_o~.3 __ , __ o~.J, __ _
74 11.167 : 0.0072 0.0143 1.3413 0.0491 0.0027 l.1240 0.0141 0.0028 0.3 0.3 ·7~--11 1\1 I OOOT'_.. ·oo-143--1'-"3'55-'o''--+'-o~.0~5,19._-+---'0~00~2~8-+-~l.~13~8cl_,_~0~.0~1~4~1--"~"'o.~oo'2=9'-+--0~.~3--+--~-0.J ---
----76 ··----=--__ I 2io0 -~--,o_:~,,U1c;,·_-_,i ._-_o,· :o~-1 ... ·4~)-+-~'~''~'~'-+--''~05~'~'-+--o~.00=2,9_+-~1_1~5~22 _ _..__~o.~0~14~1_4-~0~.0~0~J~0-+-~0~.3 __ · -+----~'~.,_-_---I
__ T!___ --_, _ 1_2.662_----+-_,0~0,0_7,c2--+-i~O~.o,1~4~]-+-~u,,,'~'-+~"c"'~'-'-+--O~.OO='~·-l-'l~.lc6~6]~_,__o~.~"~14~1--+-~oo~·."oo='"·',]'05 ---·-· ~oo~'i--f-~"~·J~--+
78 12833 i 00057 ' 0.0113 1.3956 0.0601 0.0024 1.1774 0.0111 0.3
-·-;fr,---13 ooo 0.0051 o.ui 13 1.4069 o.0625 0.0024 1.1886_.,_.,oc-.o,.1_,_1._1 -l-.,_o.,.,oo.,_2",._+-_o.,_.c.J _ __._-"0"'3-,---i
>-~8c0---+-~l'J.716~7-+-~0~.0t~l~577 -f-707.0-1 ~13-+-~l-.4clR'3--+--'0~.06~50--+--0.c00~2~5-+-~I .-I 99i 0.0112 0.0025 0 3 OJ
l-----""--;.--'.C.""-f--"-~-t--"-=-+--"'"""'--+----''"'="'--+-"-;;c:.:c;._-+--'-""~-+----"='-"--+-"-""''"'---+--"-''---'----+c;...-.. -81 13.333 0.0057 0.0113 1.4296 0.0675 0.0025 l.2109 0.0112 0.0026 0.3 i 0.3
82 I ].500 0.0057 0.0113 1.4410 0.0700 0.0025_-_-+~12:C:2~2':-0-J--"0"'.0 .. l_..12,_+_0.,_ . .,_00,c2,o6c_+----'0::C.C:.J _--+' _ _cD·;:l_---j
83 11667 0.0057 0.0113 1.4523 0.0726 0.0026 l.2332 0.0ll2 0.0027 0.3 0.3
84 13.833 0.0057 0.0113 1.4636 0.0752 0.0026 1.2443 0.0112 0.0027 0.3 0.3
85 14.000 0.0057 0.0113 l.4750 0.0778 0.0027 1.2555 0.0112 0.0027 0.3 0.3
86 14.167 0.0057 0.0113 1.4863 0.0805 0.0027 1.2667 0.0112 0.0028 0.3 0.3
87 14.333 0.0057 O.Oll3 1.4977 0.0833 0.0027 1.2779 0.0112 0.0028 0.3 0.3
88 14.500 0.0057 0.01 lJ 1.5090 0.0861 0.0028 1.2890 O.Ol12 0.0029 0.3 0.3
89 14.667 0.0057 0.0113 J.5204 0.0889 0.0028 1.3002 0.0112 0.0029 O_J OJ
---~i---~17,.~,.~n~+,.-_--_q/!l}~-·-o .. otoo·--· 1---',~.,~J;o.;-,-+-',~.o",:",~,-+--'=o".00=2,:--+...c.,'=i"'100:c.:--+-'o".oo""'•"s-+-"'o".00~20'---+-"o."'i---+-----::o-:1"-.~
_J_5.ooo _L _o,,o:C:oci,--'-:c" .,_0 .. 1 oo:C.:--'--'-':;''°"'<''-+----::oc:o.-,i~,._+----::-o.700"'2°',-+-_1". ,,.1':c'"''-t--"'"009~8'---+-":c·c:coo:cc'c:''-+-'-'"'··,:.' ---1------::-0'=1 ___ _
--~---. 15.167 0.005 0.0100 J.5502 0.0965 0.0026 l.3296 0.0098 0.0026 0.3 0 3
91
9J---~--.:---·--:1"·,°'.J"'Jl::--+---:"'o·o"'o:cs-~.,o:c.0"1~00::--+'-1"'.s"60~~2_+-_o::c.oc,,~'.:.1-+---:""00=2•~+~1~.,"1•:.c"'-+--":c·009~;;'-+-.;o-:.oo"-"27::--+-~"~j--_·-_--_,_ -~''-J _ _,
94 ; t 5.500 0.005 0.0100 1.5101 o. 1011 o 0026 U49:! o.0098 0.0021 o.J OJ
95 15.667 o.005 0.0100 1.s801 0.1043 0.0021 1.3.591 o.0098 o.oo'-"'-+-~o=J--t_~o=·'----'
96 15.833 0.005 0.0100 1.5900 o.w10 0.0021 1.3689 o.oo9s o.0028 o.J o.J
-----:'cc'--t-.,.107.7000~-+-o:c.;::oo:ccs._+--:-o."o'-100:c.:--t-~1...,.6000~:---+---:""·1cco"'97~+-"o.,::oo;::2c:'-+---"1.:CC,,"s"',_+-.;o-:.009_.8:--+----::-o.,::oo:c:2c:s:--+-o:c.c-'--+---:-o.'cJ-,--1
98 16.167 0.005 0.0IOO I.6099 0.1125 0.0027 1.3885 0.0098 0.0028 0.3 0.3
99 16.333 0.005 0.0100 1.6199 0.1152 0.0028 1.3983 0.0098 0.0028 0.3 0.3
100 16.500 0.005 0.0100 1.6298 0.1180 0.0028 1.4081 · 0.0098 0.0029 0.3 0.3
f----:CIOc:l~-t--c-160--.66~7-+-~0".00'"'5_+-~0~.0=l-'-OO~_,_._l~.6=3=9~8--+--0= ... 12=0=8 _ _,__~0"'00=28~_,_~l ... 4~18=0._+-_oc..'-oo='~'-+-~o"'.00=29'---+-~0=.3----l-'-0"'.3.__-f
!02 16.8]3 0.004 0.0080 1.6477 0.1231 0.0023 1.4258 0.0079 0.0023 0.3 0.3
101 : 1?.000 I 0.004 0.0080 1.6551 0.1254 0.0023 1.4331 0.0019 0.0024 03 0.3
-104·---:-17. 167 : 0.004 0.00~8~0._+---'l "'.6~63,c~ _ ___Q. _1_27_7_ --'0".00=2=]-+-,IC4~4~15.__,__o'-.~oo~,~·--+--'0"'00=2~4-+-._o_;c.3_--f~-O~.J~-~
-·.-·10_~··=> ~ 11 .. ,U_ u.oo_i-T o."0080 t.6716 0.1301 0.0023 1.4494 0.0019 0.0024 o.3 o.:.
_I 0_6 __ . _ ______!2_~~--'" coo,,_-+· ~"~oo~'="'--+-~'~·'c7c96c_-+'-'C'"''~"--+-~"~·00=2=3-+-~l.-4S~7c3_+-~0~00='·~-+---'0.~0=02c4._+-_o~.~J---! -~_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.
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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
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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.
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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
\
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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:
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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:
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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
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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.
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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
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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
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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;
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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.
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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.
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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
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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
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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
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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.
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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
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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.
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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
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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)
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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)
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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 _
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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.
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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
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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
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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
--------------
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010
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¢.
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ov/
"'o'</'Y _,{I}
7
GYPSY SUBBASIN DRI.INAGE
(UNAFFECTED BY REME:IJIATION)
/
/l / -·!/.-./ < ----i;:_, R • . •
,.
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&./ ' I
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// \._ ///
/ ,·. /: . . ~ . -/ '· ·. / )-/; / ;, ~ II.
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, I I -
/ --\. WETLAl\'O ~I/ _· .// f/ WE ___ -TLAND \) D ~(<)---_./_-/ / . -E :"-/ ---
./ Ii ~ ~/ .-__ . •., Q;)'. .·
---JWETLAN~, ··, ":J,/ __ .---
1 B "-. /,/.c· -
.---. / • I
<;.• '-......_.._,,,, ,/ .. " ....
'1 FlWET~ND
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A
I
.;::;(<) I .
a-. -
---~-. ... ' I-. Je..
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--,-_} ,--_-_,_----. ---~
/ ,;/!;,/<~;( •·
·/--:/-.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.
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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.
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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).
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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
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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.
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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
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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.
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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
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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.
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f. • 2
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WETLANDS AND SHORELINE STRUCTURE
QUENDALL AND BAXTER PROPERTIES
REMEDIATION FOOTPRINT
RENTON, WASHINGTON
---:si,w-.i
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Nm i ALL HACITAr WE r LAND. AND PflOJECT Ft::AILJRL
LOC:i' 1 IONS AND QIJANTITl~S ARE APPROXIMATE
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0 100 _ :lXJ 2(0 4'..0
APPROXl~.V,TE SCP.LE IN fEET
FIGURE 2-5
DATE 9!24198
PROJ. NO. K899142A
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NO'I '' ALL HABllAI. WETLAND. AND PROJECT FEATURE
LOU1l IONS AND QUANTITIES ARE APPl<OXIMATE
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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
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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
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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).
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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
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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).
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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
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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.
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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/
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0:: I
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o: I I!:!.
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I
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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
/
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--/ '/~5'':'-'' --=--c//
-
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/----/ / -,cf~"'=-c=-~ -:
1
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/ -i / ~::---~l~~~7,/'
:t . . -----~¥.·j / /
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§ ==-·--·--~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•
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0:: i
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a:, '
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~i
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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
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r-------------'"''" .. . , oNR 9'"NERSH1P \
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~-,:R~~,t~:" E.)FFEf, ,,•1-r•~co,. ,"·l::ri .... -...,_ ~
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ouENDALL
~ -~ -
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SHCRELINE 8Uf"r r;;;
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CONCEPTUAL SHORELINE AND WETLAND MITIGATION PLAN
QUENDALL AND BAXTER PROPERTIES
REMEDIATION FOOTPRINT
~ <.!\ 0,•.s ~(-·· \}
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6 '? .. -,~ 'Yq.
6?,'>'o~
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\ ' ·-\;-------------.;
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\
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(/()
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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
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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.
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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,
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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.
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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.
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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.
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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.
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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.
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• 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
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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
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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
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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.
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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.
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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.
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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.
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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
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REMEDIATION ACTIVITY ANO W!TLANDS ANO SHORELINE VEGETATION
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Memorandum
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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
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BAXTER SOUTH PARCEL MITIGATION
SOUTH BAXTER PARCEL
RENTON, WASHINGTON
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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
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200 400
SCALE IN FEET
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NORTH
PROPERTY
J.H. BAXTER
JAGC0-02438-895
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PROPERTY LOCATION
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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
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JAGC:0.02438-850
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SCALE IN FEET
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EXTENT OF SOUTH BAXTER
ENVIRONMENTAL CAP
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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.
//
'
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DATE: 5/10/01
' "' ' "' '
::.I I
J,H. BAXTER
JAGC0-0243Ull5
DRWN: A.S./SEA
LEGEND • COMPLIANCE MONITORING
WELL
BAXTER COVE
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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
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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
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STORMWATER TECHNICAL INFORMATION
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KLEMENCIC
ASSOCIATES
SECTION I· PROIECT OVERVIEW
INTRODUCTION
MAGNUSSON
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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
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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
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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
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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
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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
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• 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
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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
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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
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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
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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
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KLEMENCIC
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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•
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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
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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
-·
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•
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Scenario: Proposed
Profile: Profile -1
'SCenatio: Pn:iposed
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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.---·-
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Profile
Scenario: Proposed Future
Profile: Profile • 1
Scenario! P,oposed Fl.llURII
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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.
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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
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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
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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.
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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)
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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
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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.
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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)
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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.
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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."
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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
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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
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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
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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).
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• 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.
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(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
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(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.
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Seattle Seahawks Corporate Headquarters and Training Facility
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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.
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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.
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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.
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Seattle Seahawks Corporate Headquarters and Training Facility
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APPENDIX A
PESTICIDE ASSESSMENTS
September 20, 2006 A.C. KINDIG & CO.
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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.
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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.
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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.
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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.
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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.
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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
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CEDAROCK CONSULTANTS, INC. and A.C. KINDIG & CO.
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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.
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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.
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Seahawks Corporate Headquarters and Training Facility
Renton, Washinwon
'L {,~~-;1
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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).
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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
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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.
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----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.
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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
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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.
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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.
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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.
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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.
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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
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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
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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.
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• 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.
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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).
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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).
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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
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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.
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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
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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.
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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.
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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
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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).
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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.
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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.
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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
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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.
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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.
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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.
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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).
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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.
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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.
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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.
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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.
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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.
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• Sheet I
• Sheet LIOO
• Sheet Sheets CE201-202
• Sheets CE22 l-224
• SheetCE245
• Sheets CE301-302
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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)
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APPENDIX2
RESUMES FOR KEY PLANTING PLAN DESIGN AND
AQUATIC/WILDLIFE FUNCTION ANALYSIS CONSULTANTS
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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.
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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.
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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
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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 --------------
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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
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SEAHAWKS HEADQUARTERS AND
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o"m 10/5/06 DRWN: E.M.LSEA FIGURE~
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VULC1~185!J9.510
CONCRETE SLAB CAP SECTION
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DATE: 10/5/06 DRWN: E.M.LSEA FIGURE7
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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 _________ _
-----------· --------------------------------------·--··--
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PLANTING PLAN
SOUTH BAXTER RE~1ED1ATION
REI\ITON, WASHlt~GTON
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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.
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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-·----~------------------•· -••-•-----··-· •·•-• -·-·--·------·-·----·--·-··----------------···------·---------. -·-----,-------------,------~-
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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.).
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MITIGATION GOALS AND PERFORMANCE STANDARDS
J.H. BAXTER SOUTH PROPERTY
SHEET L-3
DATE 7/01
PROJ. NO. KB99142 RENTON, WASHINGTON 8l-------------------------------------------------------,----------------------------------------------------------------------------~-----------------------
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CITY OF f'IENTO/ l G
SEP 2 2 2D06
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15 SEP 2006
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BUILDING
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CRAWFORD ARCHITECTS, LLC
1901 main street, suite 200
kansas city, mo 64108
tel: 816.421.2640
fax: 816.421.2650
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NATURAL TURF FIELD CAP
ARTIFICIAL TURF FIE LD
STRUCTURAL CONCRETE
SLAB CAP
CAP
ASPHAL T PAVEMENT CAP
50 FEET SETBACK
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SEAHAWKS HEADQUARTERS AND
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ETEC 1 "=50'
VULC1-19589-510
DATE: 10/5/06 DRWN: E.M./SEA FIGURE 3
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