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HomeMy WebLinkAboutMiscCity of Renton LAND USE PERMIT MASTER APPLICATION PROPERTY OWNERS) NAME: Port Quendall Company ADDRESS: 505 Fifth Avenue South, Suite 900 CITY: Seattle, WA ZIP: 98104 TELEPHONE NUMBER; (206) 342-2000 APPLICANT (if other than owner) NAME: (see above) COMPANY (if applicable): ADDRESS: CITY: ZIP: TELEPHONE NUMBER CONTACT PERSON NAME: Ray Collliver COMPANY (if applicable): ADDRESS: 505 Fifth Avenue South CITY: Seattle, WA ZIP: 98104 TELEPHONE NUMBER AND E-MAIL ADDRESS: (208) 342-2000, rayc@vulean.com PROJECT INFORMATION PROJECT OR DEVELOPMENT NAME: Baxter Development Project — Phase I PROJECT/ADDRESS(S)/LOCATION AND ZIP CODE: 5015 Lake Washington Boulevard N. Renton, WA 98055 KING COUNTY ASSESSOR'S ACCOUNT NUMBER(S): 2924059001 2924059015 EXISTING LAND USE(S): Vacant PROPOSED LAND USE(S): Commercial/Offioo/Residential EXISTING COMPREHENSIVE PLAN MAP DESIGNATION: Commerclal/Offioe/Res identia I PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION (if applicable): Commercial/Office/Residential EXISTING ZONING: Commercial/Office/Residential PROPOSED ZONING (if applicable): Commercial/Office SITE AREA (in square feet): 857,477 s.f. SQUARE FOOTAGE OF PUBLIC ROADWAYS TO BE DEDICATED: n/a SQUARE FOOTAGE OF PRIVATE ACCESS EASEMENTS: none PROPOSED RESIDENTIAL DENSITY IN UNITS PER NET ACRE (if applicable): n/a NUMBER OF PROPOSED LOTS (if applicable): 1 Q:web/pw/devserv/forms/planning/masterapp.dac 1 06/06/06 PROJECT INFORMATION (continued) NUMBER OF E 44ISTING DWELLING UNITS (if applicable): SQUARE FOOTAGE OF PROPOSED RESIDENTIAL BUILDINGS (if applicable): tjA SQUARE FOOTAGE OF EXISTING RESIDENTIAL BUILDINGS TO REMAIN (if applicable); g. SQUARE FOOTAGE OF PROPOSED NON-RESIDENTIAL BUILDINGS (if applicable): Zoo, too C'.P, SQUARE FOOTAGE OF EXISTING NON-RESIDENTIAL BUILDINGS TO REMAIN (if applicable): hk NET FLOOR AREA OF NON-RESIDENTIAL BUILDINGS (if applicable): NUMBER OF EMPLOYEES TO BE EMPLOYED BY THE NEW PROJECT (if applicable): T Av4yA" PROJECT VALUE_ IS THE SITE LOCATED IN ANY TYPE OF ENVIRONMENTALLY CRITICAL AREA, PLEASE INCLUDE SQUARE FOOTAGE (if applicable): ❑ AQUIFER PROTECTION AREA ONE * AQUIFER. PROTECTION AREA TWO O FLOOD HAZARD AREA sq. ft, ❑ GEOLOGIC HAZARD sq. ft. ❑ HABITAT CONSERVATION sq. ft. SHORELINE STREAMS AND LAKES sq. ft. WETLANDS i'saso sq. ft. LEGAL DESCRIPTION OF PROPERTY (Attach legal description on separate sheet with the following information included) SITUATE IN THE 5*-+'10vcSf" QUARTER OF SECTION?°), TOWNSHIP2414, RANGE___ f� IN THE CITY OF RENTON, KING COUNTY, WASHINGTON. TYPE OF APPLICATION & FEES List all land use applications being applied f&: 1. 3. 2, 4. Staff will calculate applicable fees and. postage: $ AFFIDAVIT OF OWNERSHIP I, (Print NameJs) declare that I am (please check one) _ the current owner of the property involved in this application or_ the authoriz representative to act for a corporation (please attach proof of authorization) and that the foregoing statements and answers herein contained and the information herewith are in all respects true and correct to the best of my knowledge and belief. I certify that I know or have satisfactory evidence that A�- %� signed this instrument and. acknowledged it to be his their free and voluntary act ioi the uses and purposes mentioned In the instnanent. (Signature of Owner/Representative) (Signature of Owner/Representative) \\\\\\l11t11I E. o Notary Public in and for the State of Washington co A Notary (Print) My appointment expires: \I `4_[.- D<) k G Q:wcWpw/devserv/forms/planningtma_sterapp.dcc 2 07/29/05 PORT QUENDALL COMPANY CONSENT OF DIRECTORS The undersigned, being all the directors of PORT QUENDALL COMPANY, a Washington corporation, hereby consent to and adopt the following corporate resolution: RESOLVED, that: The following is hereby appointed as an additional officer of this corporation to serve until the appointment of her successor: Vice President Ada M. Healey DATED this day of March, 2002. DIRECTORS: Paul G. Allen r► • 50297093.03-5 DEVELOPMENT SERVICES DIVISION WAIVER OF SUBMITTAL REQUIREMENTS FOR LAND USE APPLICATIONS f,✓ This requirement may be waived by: 1. Property Services Section 2. Public Works Plan Review Section 3- Building Section Q. Development Planning Section PROJECT NAME:���Y� DATE:,r ZD� 0:1WEBIPWIDEVSERV\5orms\Planninglwaiver.xls 11/04/2005 PX LJr T r. tic) ve DEVELOPMENT SERVICES DIVISION WAIVER OF SUBMITTAL REQUIREMENTS FOR LAND USE APPLICATIONS LAND Us PERMIT SUBMITTAL WAWED IVIC7D�1=lEQ. COM MENTS.- N. :. Parking, Lot Coverage & Landscaping Analysis 4 LV P ri Reductions (P. a Plat Name Reservation 4 Pbtge , Preapplication Meeting Summary 4 PuhiicVi/o►CcsApprovai I etfer2 Rehabilitation Plan 4 Screening. #tars 4 Plan 2AND4 ✓ Stream orfarc�tudY, S�anard„ Stream or Lake Study, Supplemental Strr?afrr or tice Mitiation Play Street Profiles 2 TitieEeport orlaterfiate 4X. Topography Map a " Tree Cutting/Land Clearing Plan 4 j l]rba i Centet� igrs c rreflay 17istfict Report a :,; � ' ' _ Utilities Plan, Generalized 2 ✓ Mt�ar-ds M � atrAn Flan, Fi��4 Wetlands Mitigation Plan, Preliminary 4 ✓ Wetlands Re ............ Wireless: Applicant Agreement Statement 2 AND s Inventory of Existing Sites 2AN03 Lease Agreement, Draft 2AND 3 Map of Existing Site Conditions 2ANC) 3 Map of View Area 2AND 3 Photosimulations 2AND 3 This requirement may be waived by: ' 1. Property Services Section PROJECT NAME: ��✓ �1t' Pro 2. Public Works Plan Review Section 1 3. Building Section DATE: M1Giy c 4. Development Planning Section f Q:NE81PMDEVSERV1FormslPlanninglwaiverxls � n) --= 11/04/2005 '7�a4' 3 `c5S9 M, CA ! CA C4 N V z M N C4 • U T24N R5E W 1/2 _ o®4ZONING - - - "�°a b �+�+� JUAWG o `�'„""l`uMal29 T24N R5E W 1/2 -%29 ZONING MAP BOOK FW71 Resource Conservation R-1 Residential 1 du/ac e-q Residential 4 du/ac R-U Residential B du/ac RNH Residential Manufactured Names R-70 Residential 10 du/Be a-Sd Residential 14 du/a- RM-r Residential Multl-Family Rh-7 Residential Multi -Family Traditional [wm--UJ Residential Multi -Family Urban Center* Cv Center Village UC-NI Urban Center - North 1 UC-N2 Urban Center - North 2 Co Center Downtown' U1R Commercial/Office/Residential CA Commercial Arterial* CO Commerclal Office* w Industrial - Heavy IM lndustrial - Medium It Industrial - Idgbt (P> Publicly owned �..--- Renton City Limits »- -- Adjacent City Limits i Hoak Pares Boundary CN Commercial Neighborhood FPAGE# PAGE * May include Overlap Diatrlete, See Appendix INQEX maps- For additional regulations in Overlay tricts, please see RMC 4-3, Printed by Print & Mail Svcs. CRy of Renton ,V) bl Asx A _ta 'k rc. Ncs svfhti alrlix FUSED Qm w wo 4.'VRETEc !Zp RE1AS Uv ? _ S.u. 6A M&IEG rvQ q* S.M. L T _ Ta_C. — - FORMER WOOD TREATMENT SITE CLEANUP- J.H. BAXTER SOUTH PROPERTY sse� �c/as/o•. us. 7i +at0+ 1/kA.AN,l W2.52D u+nufj CNT OATS 1 1o/CA/04 ETstAhntti� M0. 4 �C¢TRAC ECa S KIM A B r i r r r r I 6rrr � r � r / r r r r r r r . LEGf+a6 fQftE$t STRUCN9K/FEATUbKS FVNL 6p" COW" [f!SFriG CROV10 SLWACC Cb41" CLEvnP+OM [FE(1, q") EYFSTrft, WOVIORACo WELLS FRp£Ct BOUNDARY 81N6ED FWAL GWCA COKTbcIR E XPl7E5 12 FINAL GRADING PLAN North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA PROJECT NARRATIVE Situated on the eastern shore of Lake Washington, the Baxter site is a stunning setting. The site is highly visible from the Lake and adjacent Interstate 405. This site offers a wide variety of opportunities to enhance the Seahawks brand due to its address. With its location on Lake Washington and its beautiful views, the site is a perfect place to create a signature development for the City of Renton and the Seattle Seahawks. Location The Port Quendall Company currently owns the North and South Baxter Sites. The Baxter Property, known as the J. H. Baxter Property/Renton, 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 Baxter Property occupies approximately 19 acres, three miles south of the junction of Interstate Highways 405 and 90. The 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. Directly to the south is the Quendall Terminals property. Interstate 405 is approximately 500 feet to the east. Access Interstate 405 provides regional access to the site. Vehicular access is also provided by 440 Street from the south, Lincoln Avenue from the east, Ripley Lane from the north and Lake Washington Avenue SE from the northeast via 44th Street interchange. The interchange at Interstate 405 is scheduled for future improvements by WDOT. These improvements will enhance access to the site but is not required for the facility to operate. An existing Burlington Northern Santa Fe 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 4 or less. Direct access to the site is provided via two at grade crossings. Utilities Utility service including water, sanitary, storm sewer, electricity, gas, cable and fiber is provided to the site. The site also has an existing dock on the lake. It is in need of repair. However, the existing structure (and permit) is in place. The site qualifies for Planned Urban Development (PUD) status. An Environmental Impact Statement (EIS) is not required. It is not anticipated that the shoreline will be altered. Thus, preliminary assumptions do not include regulatory involvement by the Army Corps of Engineers. Final determinations of applicable codes and jurisdictional control will be determined as detailed design proceeds. Project Narrative 24 May 2006 Page 1 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA Project Components The project consists of two primary phases including: 1. Final Cleanup a. Final Capping @ exterior fields and site areas b. Final Capping @ surface parking lots c. Final Capping @ building slabs at ground level 2. Construction of Building and exterior fields above Capping A Partial Certificate of Completion for the Capital Portion of the Cleanup at the JH Baxter South Parcel has been issued. Remaining cleanup (capping and institutional controls) will be performed under Consent Decrees between the Department of Ecology and Port Quendall Company as part of initial work on the properties. As a result, certain state and local permits are preempted pursuant to the Model Toxics Control Act, although substantive requirements of those statutes and regulations will be satisfied by the cleanup approval. Remaining cleanup (capping and institutional controls) will be performed under Consent Decrees between the Department of Ecology and Port Quendall Company as part of initial work on the properties. As a result, certain state and local permits are procedurally preempted pursuant to the Model Toxics Control Act, although substantive requirements of those statutes and regulations will be satisfied by the cleanup approval. Proposed Uses Proposed uses include administrative offices for professional football franchise and accessory training and practice facilities. Potential tenant space may include medical clinic and/or incidental retail uses. Size of the Overall Site Approximately ±19.0 acres Facility Features • A permanent indoor practice field structure • Four (4) outdoor practice fields • Approximately 200,000 gross square feet of enclosed space will be constructed including the indoor practice field • Approximately 50,000 gross square feet of training facilities will be provided. * Approximately 15,000 gross square feet of player meeting space will be provided. • Approximately 48,000 gross square feet of administrative offices will be provided. Project Narrative 24 May 2006 Page 2 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA Training Camp The new facility will accommodate annual training camp on site. Training camp will be open to the public during most days. Training camp typically begins the last week in July and ends on the third week of August. Parking for a training camp will be accommodated off -site. On Site Parking ±300 Cars (final count to be verified) Setbacks A fifty foot minimum setback from Lake Washington for structures will be provided consistent with Renton Development regulations and the Renton Shoreline Master Program. It is proposed that setback averaging be utilized since setbacks vary and range from 50 feet to over 90 feet from the shoreline. The following brief facts are provided for reference: Proposed Goals The design of the facility will be developed with the following goals in mind- 1 , To create a "state of the art facility" that accommodates the continued growth and evolution of the Seahawks family and the NFL. 2. To create flexibility and ability to share spaces (dual uses) where possible. 3. To learn from other facilities in the NFL and "raise the bar" in order to keep pace, and to surpass other teams where appropriate. 4. To create a facility that is attractive and competitive to free agents and existing players as they enter free agency. Specifically, the Seahawks require competitive facilities as they recruit and retain personnel. 5. To improve interaction among staff - create a sense of community_ 6. To reinforce and enhance the Seahawks brand. 7. To create revenue sources where possible. 8. Create a facility with SOUL, where players and staff want to be .... something that the community and fans are proud of. 9. Create an environment that promotes excellence - both on and off the field Site Areas Four outdoor practice fields are proposed. Three of the fields are full, 100-yard (natural grass) fields. One of the outdoor fields will be an artificial surface and will be approximately 140 yards long. The final surfaces for these fields are yet to be determined. One indoor -practice facility included with a synthetic surface that will be determined at a later date. The surface should be comparable to the surface at Qwest Field or better. The indoor practice facility shall be a full 100- yard field with 25 to 30 feet of runoff minimum at sidelines. A freestanding field maintenance, grounds keeping, storage and equipment facility shall be provided on -site. Project Narrative 24 May 2006 Page 3 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA Architectural Design Detailed design has just commenced. The design developed to date features the use of traditional architectural devices to reduce the apparent scale and mass of the project are being explored including: arcades, horizontal expression lines, special roof treatments plus fenestration and glazing systems. At the lakefront, the office components are placed in front of high mass elements associated with indoor practice facility to further reduce the apparent mass of the facility. This approach occurs at the south fagade as well. To the west, the building is entered at the second level, thus reducing the massing of the fagade facing Interstate 405 further_ To the north, landscaping will be incorporated at the building perimeter as well as the property line to buffer the facility from the adjacent residential uses located to the north. Views from the lake will be altered. The site is currently vacant. Views to the lake from adjacent uses located to the north and south will not be adversely affected. Views to the lake from structures located to the east, across Interstate 405 may be altered above existing tree lines. Approximately 30 to 40 feet of view above existing trees could be obstructed by the highest building masses. The design of the facility has maintained view corridors to Lake Washington from adjacent properties. As detailed design proceeds, these view corridors will be developed further. Civil Systems Civil systems include temporary erosion and sediment control, site preparation, grading, on -site vehicular paving, exterior storm drainage, exterior water and fire protection services, and exterior sanitary sewer services. Design References The following references shall be used for the design of the civil systems: ■ City of Renton Standard Plans and Specifications • King County, Washington, Surface Water Design Manual, 2005 Version ■ Department of Ecology Consent Decrees and Partial Certificate of Completion for the Baxter Site(s) Temporary Erosion and Sediment Control Temporary Erosion and Sediment Control (TESC) measures will include Best Management Practices for construction activities, Storm water surface runoff during construction will be controlled by interceptor berms or swales and sediment traps and/or ponds. No construction site storm water runoff shall drain as untreated surface runoff to Lake Washington. Site Preparation Site preparation will include clearing the site and removing unsuitable materials from the site. The site is currently undeveloped so site demolition will be limited to work at the driveway connections at Ripley Lane and the BNSF railroad. Project Narrative 24 May 2006 Page 4 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA Paving On grade paving may include several surface covers. The driveways and loading dock may include a thicker asphalt pavement section than car parking areas, The fire lane may include artificial turf over pervious pavement and/or Grasspave2TM Storm Drainage Storm drainage for the site will be in conformance with City of Renton standards. There will likely be three basic storm drainage systems proposed for the project: ■ Storm water runoff from the fields will be collected through a subdrainage system ■ Storm water runoff from the roof areas will be collected with roof drains and storm drains ■ Storm water runoff from the vehicular impervious surfaces will be collected and treated with natural (Bio-Retention and/or Ecology Embankment) and/or conventional (wet vault(s) and/or Storm filterTm) drainage facilities. Detailed design is not complete. The preliminary design is that storm water runoff from each area will be dispersed as non -concentrated sheet flow as in the existing condition. The only portion of site storm water runoff that may drain to Lake Washington via a storm drain would be the water quality storm event runoff from the loading dock. Because of grade constraints, the storm water runoff from the loading dock may be routed through a water quality treatment facility, a flow sputter to bypass storm water runoff from larger storm events, and then through the existing outfall to Lake Washington. Water and Fire Protection Supply Service lines for domestic water supply and fire protection will be installed from points of connection at the 12-inch waterline west of and adjacent to the BNSF railroad. The water line may loop around the practice facility building. One or more fire hydrants may be located on site. Sanitary Sewer Sanitary sewer laterals will be installed from the points of connection at the public sewer line west of and adjacent to the BNSF railroad. Connections points will be located at manholes because portions of the existing public sewer line may be pressurized from City of Renton (public) lift stations. Two sanitary sewer laterals are anticipated for the project. Offsite Street Improvements A new driveway connection across the BNSF railroad will be constructed at the midpoint of the site. The existing driveway connection at the northeasterly corner of the site may also be modified. In addition, portions of Ripley Lane will be improved. Public Access to Shoreline Public access to the shoreline will be provided as indicated by the Conceptual Site Plan. Access is proposed along the south property line with connections to wetlands. It will be provided consistent with the guidelines outlined in the South Baxter Consent Decree and associated conceptual Project Narrative 24 May 2006 Page 5 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA diagrams. Due to the security requirements associated with the daily operation of the Seahawks Headquarters, public access must be controlled. Construction Construction is scheduled to begin in June 2006. It will occur in three phases including_ a. Final Remediation and Cap on Overall Site* May/June 2006 until November 2006 b. Final Remediation and Cap under building footprint* October 2006 until March 2006 c. Building Construction above the Cap November 2006 until June 2008 "Pursuant to Department of Ecology Approval as lead agency (Items b and c). The project is required to open in June of 2008. Construction of the "final cap" for the majority of the site will consist of earthmoving existing soils and potentially imported fill in accordance with Department of Ecology and City of Renton requirements. If imported fill is required, it will be stockpiled on site on a temporary basis. Construction of the "final cap" at surface parking and the building (ground level slab) will commence after rough grading in accordance with Department of Ecology and City of Renton requirements. During earthmoving and grading, best construction management practices will be in -place to prevent erosion and sedimentation impacts to surface water. Dust may be generated during construction activities. Dust will be suppressed by spraying water, as necessary. Stockpiles will be covered to the extent practicable to further minimize dust during construction. No fill or dredge is anticipated to be placed in or removed from surface water or wetlands. During construction, there will be noise from construction equipment that will have minimal impact to adjacent uses. Impact -type noises will be limited and will occur during restricted hours to minimize any potential adverse impacts to adjacent uses. These noises will occur during daylight hours and will vary seasonally. Once the building is enclosed, these noises will be contained within the enclosed building. Construction is anticipated to take approximately 18 months with approximately 6 months of exterior noise possible. Project Narrative 24 May 2006 Page 6 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA DEVELOPMENT SERVICES DIVISION ENVIRONMENTAL CHECKLIST City of Renton Development Services Division 1055 South Grady Way, Renton, WA 98055 Phone: 425-430-7200 Fax: 425-430-7231 A. BACKGROUND 1. Name of proposed project, if applicable: North and South Baxter Site Development Plan 2. Name of applicant: Football Northwest LLC 3. Address and phone number of applicant and contact person: Mr. Ray Colliver Senior Director 505 Fifth Avenue South Suite 900 Seattle, WA 98104 206 342 2000 telephone 206 342 3000 facsimile rayc(&vulcan.com email 4. Date checklist prepared: 24 May 2006 4. Agency requesting checklist: City of Renton, Washington 6. Proposed timing or schedule (including phasing, if applicable): a. Design and Documentation March 2006 to February 2007 b. Final Remediation and Cap on Overall Site* May/June 2006 until November 2006 c. Final Remediation and Cap under building footprint* October 2006 until March 2006 d_ Building Construction November 2006 until June 2008 e. Opening June 2008 *Pursuant to Department of Ecology Approval as lead agency (Items b and c). Environmental Checklist 24 May 2006 Page 1 North and South Banter Site Development Plan New Seattle Seahawks Headquarters Renton, WA 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No plans for future additions, expansion or further activity are anticipated with the proposal. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. The following information has or will be prepared: a. Future Studies 1. Updated Wetland Delineation (underway) 2. Geotechnical Report (underway) I Water Quality/Storm water Analyses (underway) 4. Transportation Analyses/Traffic Report (underway) b. Past Studies In the past, several investigations of potential contamination at the Baxter Property have been performed, generating a large volume of chemical data and visual observations of soil quality. Comprehensive summaries of project area historical information, regulatory records and environmental data were provided in the Draft Remedial Investigation Report (Woodward Clyde, 1990). Those data were incorporated with data collected by ThermoRetec during the previous due diligence process and during 1998 and 2000 to develop an interpretation of site conditions currently present. These data were presented in the South Property Feasibility Study ([FS]; ThermoRetec, 2000) and the North Property Feasibility Study and Cleanup Action Plan ([FSICAP]; ThermoRetec, 2000). SEPA was completed in 2000 for the site representing compliance with the State Environmental Policy Act ("SEPA") environmental review requirements for the proposed remedial actions to be performed as stated in the Consent Decree. Ecology has been established as the agency lead pursuant to SEPA for all cleanup actions under the consent decree. Remedial actions occurred in 2002 and 2004 at the South Baxter property. Baxter Cove Wetland Monitoring Reports have been prepared in 2005 and 2006. 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 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. 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. The proposed development was never pursued. Environmental Checklist 24 May 2006 Page 2 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. Remediation and mitigation has been substantially completed on the South Baxter property as documented in the Completion Report (2005) and approved by the Department of Ecology by the April 10, 2006 Partial Certificate of Completion. Capping of residual soil impacts to prevent direct contact to humans, institutional controls to insure cap integrity and future groundwater monitoring remain to be completed pursuant to the Consent Decrees and Cleanup Action Plans which were previously subject to a SEPA review and a Mitigated Determination of Significance issued by the Department of Ecology in 2000_ 10. List any governmental approvals or permits that will be needed for your proposal, if known. a. City of Renton Master Plan approval b. City of Renton Shoreline Substantial Development Permit c. City of Renton Critical Areas Review d. City of Renton SEPA Review Remaining cleanup (capping and institutional controls) will be performed under Consent Decrees between the Department of Ecology and Port Quendall Company as part of initial work on the properties_ As a result, certain state and local permits are preempted pursuant to the Model Toxics Control Act, although substantive requirements of those statutes and regulations will be satisfied by the cleanup approval. 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. Proposed Uses Proposed uses include administrative offices for professional football franchise and accessory training and practice facilities. Potential tenant space may include medical clinic and/or incidental retail uses. Size of the Site Approximately ±19.0 acres Facility Features • A permanent indoor practice field structure • Four (4) outdoor practice fields • Approximately 200,000 gross square feet of enclosed space will be constructed including the indoor practice field • Approximately 50,000 gross square feet of training facilities will be provided. • Approximately 15,000 gross square feet of player meeting space will be provided. • Approximately 48,000 gross square feet of administrative offices will be provided. Environmental Checklist 24 May 2006 Page 3 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA Training Camp The new facility will accommodate annual training camp on site. Parking for training camp vehicles will be accommodated off -site. On Site Parking +300 Cars (final count to be verified) Setbacks & Wetlands A fifty foot setback from Lake Washington for structures will be provided consistent with Renton Development regulations and the Renton Shoreline Master Program, Existing wetlands that are constructed on South Baxter with 50 foot buffer pursuant to Consent Decree, CAP and mitigation analysis in 2000 will be maintained. It is proposed that setback averaging be utilized since setbacks vary and range from 50 feet to over 90 feet from the shoreline. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. Location As indicated by the attached site plans, the Baxter properties are located at 5015 Lake Washington Boulevard North, in the northeastern portion of Renton, Washington. They are located in the Southwest'/4 of Section 29, Township 24 North, Range 5 East, King County. The Baxter site occupies approximately 20 acres adjacent to Lake Washington, three miles south of the junction of Interstate Highways 405 and 90, and has approximately 1,800 feet of shoreline. The legal descriptions of the North and South properties are provided below. Access Interstate 405 provides regional access to the site. Other vehicular access is also provided by Lincoln Avenue from the east, Ripley Avenue from the north and Lake Washington Avenue SE from the northeast via 44th Street interchange. Legal Description BAXTER SOUTH PROPERTY That portion of the "South Parcel," as shown on Survey recorded under King County Recording No. 20000209900005, Records of King County, Washington, lying Southerly of the following described line: Beginning at the most Northerly corner of said "North Parcel"; Thence S 45 26'31" W along the Northwesterly line thereof a distance of 912.56 Environmental Checklist 24 May 2006 Page 4 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA feet to the True Point of Beginning of the herein described line; Thence S 58 13'14" E a distance of 918.82 feet to a point on the Southeasterly line of said "North Parcel," distant thereon 267.64 feet Northerly of the angle point in said Southeasterly line and the terminus of the said line. BAXTER NORTH PROPERTY That portion of the "North Parcel", as shown on Survey recorded under King County Recording No. 20000209900005, Records of King County, Washington, lying Northerly of the following described line: Beginning at the most Northerly corner of said "North Parcel"; Thence S 45 2631" W along the Northwesterly line thereof a distance of 912.56 feet to the True Point of Beginning of the herein described line; Thence S 58 13'14" E a distance of 918.82 feet to a point on the Southeasterly line of said "North Parcel", distant thereon 267.64 feet Northerly of the angle point in said Southeasterly line and the terminus of the said line. Location and Vicinity Map Please refer to the attached location and vicinity map in Section 1 for additional detail. Topographic Map Please refer to the attached topographic map in Section 1 and Section 5 for additional detail regarding existing conditions. Please be advised that final topography surveys are being conducted. The attached information is subject to verification based on final surveys_ Please note that current plans indicate stockpiles of wood chips that have been removed. B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one); flat, rolling, hilly, steep slopes, mountainous, or other. The site is located on the shore of Lake Washington and is generally flat. b. What is the steepest slope on the site (approximate percent slope?) The slope of the site is generally 1 % to 2% with a maximum slope of approximately 5%. Please note that stockpiles of wood chips indicated on some topography maps have been removed, c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. The Baxter Property (both North and South) is located on the eastern shore of Lake Washington on the former delta of May Creek, which is an under fit stream remaining within the glacial Kennydale Channel. The subsurface geology of the site is a combination of fluvial deltaic, lacustrine near shore and constructed fill deposits Environmental Checklist 24 May 2006 Page 5 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA overlying Pleistocene glacial sediments and Eocene volcanic and sedimentary bedrock. The shallow geology at the project area has been heavily influenced by recent human activity, beginning with construction of the Lake Washington Ship Canal in 1916. This lowered the level of Lake Washington approximately 8 feet, and exposed a significant area of the May and Gypsy Creek deltas which had formerly been submerged. Subsequent filling of low-lying areas was performed in 1955 to extend the shoreline and raise the grade for construction of industrial facilities at the Baxter North and South Properties. The source of the fill material is not well documented. The combination of naturally complex deltaic deposits with numerous dredging and backfilling episodes has resulted in a highly heterogeneous subsurface mixture of clay, silt, sand, gravel and cobbles, as well as discarded debris and abandoned subsurface structures from former site activities. An interpretation of the project area subsurface geology has been made using soil boring and monitoring well geologic logs and test pit sidewall descriptions which have been generated by environmental and geotechnical investigations in the area. Due to the complexity and heterogeneity of the subsurface geology, correlation of distinct stratigraphic units across the project area has not been attempted. Rather, the subsurface geology has been segregated into three zones: the upper fill zone, the intermediate silty peat zone, and the lower sand zone. These three zones encompass the subsurface interval which may have been impacted by past site activities or which could influence groundwater movement through an impacted area. Representative cross sections of the Baxter Property subsurface geology are presented in the Feasibility Study for the South Property (ThermoRetec, 2000) and the Feasibility Study and Cleanup Action Plan for the North Property (ThermoRetec, 2000). The upper fill zone ranges in thickness across the project area up to 15 feet. The fill zone includes dredged material consisting primarily of silty to medium -grained sand, as well as imported material including clay, silt, sand, gravel, construction rubble, wood and other debris. The dredged fill appears very similar to May Creek deltaic deposits and it is difficult to differentiate without the presence of discarded debris or other obvious indicators. In most of the site, the fill zone corresponds to the unsaturated zone, although some sections of fill material are located below the shallow water table. The intermediate silty peat zone is comprised of soft to stiff dark brown to gray silty peat, organic woody silt and silty fine-grained sand with interbedded gray and brown clay, silt, sand and occasional ash lenses. This silty peat zone is most prominent in the southern and central areas of the area encompassing both Properties. The silty peat zone was encountered in soil borings with thicknesses between 3 and 30 feet, and was noted at depths up to 15 feet below ground surface (bgs). This layer shows a high degree of heterogeneity both vertically and horizontally and is saturated over most of its depth. Water levels in wells that intercept the upper fill and silty peat zones are shallow and relatively stable, with depths to water generally less than 10 feet and seasonal variations of less than 3 feet. The shallow groundwater contour Environmental Checklist 24 May 2006 Page 6 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA map for the project area is shown in the FS and CAP for the South Property and the FS/CAP for the North Property. The lower sand zone consists of gray dense to medium dense, fine- to coarse - grained sand and gravel with cobbles and interbedded gray and brown silty fine- grained sand and silty lenses. Geologic material underlying the lower sand zone includes soft gray clay to the south and bedrock to the north. Two geotechnical borings advanced by Shannon & Wilson encountered flowing artesian conditions in sand below the gravelly silt approximately 2,000 feet south of the Baxter South Property. Based on these deep borings, it is inferred that these borings encountered the regional Vashon Drift deposits and that the lower sand zone is a Holocene alluvial fan deposit. This is consistent with the bathymetry of Lake Washington adjacent to the project area, which indicates an alluvial fan extending across the lake to Mercer Island. Based on the bathymetry, this alluvial fan extends to a depth of at least SO feet below mean sea level (MSL)_ Due to the depths of these materials, they are not involved in the various remediation alternatives for the project area. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. Seven boreholes were advanced within the May Creek Delta to depths between 120 and 150 feet bgs to evaluate subsurface geologic conditions during the previous due diligence process (Shannon & Wilson, 1997). Liquefaction and settlement were identified as potential concerns. The upper 50 to 60 feet of soil within the May Creek delta are loose and potentially susceptible to liquefaction during a strong earthquake. In addition, consolidation of near -surface peats and clays from placement of the environmental cap fill upon this material may result in minor surface settlement. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Filling and grading will proceed pursuant to the Consent Decrees and Cleanup Action Plans, and subject to review and approval by the Department of Ecology. Some cleanup work and associated grading have been performed and documented in the Completion Report (2005) and approved by the Department of Ecology by the April 10, 2006 Partial Certificate of Completion. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Final capping of site will be conducted to complete remediation and cleanup activities in accordance with the Consent Decree. As a result erosion could occur but is not likely due to the shallow grade of the site. g. About what percent of the site will be covered with impervious surfaces after Environmental Checklist 24 May 2006 Page 7 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA project construction (for example, asphalt or buildings)? Approximately 40% of the site will be covered by impervious materials including buildings, plazas, surface parking and driveways. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Erosion will be controlled by maintaining a shallow grade to the site. Storm water will be managed consistent with best management practices to prevent any adverse effects from erosion. 2. Al R a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. Dust may be generated during construction activities. On -site construction equipment and hauling vehicles will generate automobile emissions. b. Are there any off -site sources of emission or odor that may affect your proposal? If so, generally describe. No, there are no off -site sources of emission or odor that will affect the new facility. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Dust will be suppressed by spraying water, as necessary, during construction. Stockpiles will be covered to the extent practicable to further minimize dust during construction 3. WATER a. Surface Water: 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. The project area includes approximately 1,500 feet of Lake Washington shoreline, The current shoreline characteristics range from gently sloping vegetated shorelines to vertical exposed dirt banks, with a minor portion of bulkhead. As part of cleanup activities, a 0.46-acre wetland and a 50-foot vegetated buffer was restored along the South Baxter shoreline. In addition, the Gypsy Sub basin drainage is located on the North Property; this system conveys storm water from 1-405 and the interchange to Lake Washington. A minor portion of this drainage is exposed while most is piped. Environmental Checklist 24 May 2006 Page 8 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA The Ordinary High Water (OHW) is approximately 18.8 feet (NAVD88) or 15.2 feet (NGVD29). This elevation is based on high water at the locks and is being confirmed. The actual determination of OHW is based on vegetation so it may be a little higher ultimately due to waves and the elevation of OHW may vary along the shoreline. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. Yes. The following work efforts are anticipated: a. Soil cover placement will occur within 200 feet of the shoreline on the North and South Properties consistent with the Department of Ecology Consent Decree requirements. b. Construction of Practice Facility c. Construction of natural grass Practice Fields d. Shoreline improvements within 50 foot setback per statute including mandatory sustainable habitat e. Construction of retaining walls and driveways. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. No fill or dredge is anticipated to be placed in or removed from surface water or wetlands. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. Not required. 5) Does the proposal lie within a 100-year flood plain? If so, note location on the site plan. No 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. There will be no discharge of waste material into surface waters. b. Ground Water: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quantities if known. No 2) Describe waste material that will be discharged into the ground from Environmental Checklist 24 May 2006 Page 9 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals ... ; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. There will be no discharge of waste material into the ground from septic tanks or other sources. c. Water Runoff (including storm water): 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters, If so, describe? Storm water is the only source of runoff at the site. Stormwater will be collected and managed in accordance with applicable regulations and best management practices. Some storm water will infiltrate or evaporate but most will drain to Lake Washington after proper collection and treatment. 2) Could waste material enter ground or surface waters? If so, generally describe. Ion d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: Storm water runoff from impervious surfaces subject to vehicular use will be treated prior to release. Best construction management practices will be in -place to prevent erosion and sedimentation impacts to surface water. Previous cleanup has improved ground water quality at the site. Final storm water controls will be designed to applicable Ecology and/or City of Renton storm water management requirements. 4. PLANTS. a. Check or circle types of vegetation found on the site: 1) X deciduous tree: alder, maple, aspen, other a. Including: Red alder saplings, sapling and seedling sized black cottonwood, red -osier dogwood, sitka willow, Pacific Madrone, Pacific willow 2) evergreen tree: fir, cedar, pine other a. Including in restored wetland and buffer area: Douglas fir, Sitka spruce, western red cedar 3} X shrubs a. Himalayan blackberry, Scotch broom, willow b. Restored wetland and buffer area: willows, snowberry, nootka rose, black twinberry, salmon berry, vine maple 4} X grass a. Non-native grasses and soft rush , bentgrass, red fescue, rye grass, white Environmental Checklist 24 May 2006 Page 10 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA clover 5) pasture 6) crop or grain 7) X wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other: soft rus, yellowflan iris, reed canary crass, small fruited bulrush. slouch sedge 8) water plants: water lily, eel grass, milfoil, other 9) other types of vegetation b. What kind and amount of vegetation will be removed or altered? A great deal of pre-existing vegetation was removed during cleanup activities as prescribed in the 2000 SEPA. The North and South Properties are largely devoid of vegetation -- approximately 10% of the property contains trees/brush. Almost all vegetation on the South Property will be removed to facilitate final cleanup and capping activities; however, no native vegetation in the restored wetland will be removed. Only grasses, sapling red alder and cottonwood on the North Property will be removed prior to placement of the soil cover. c. List threatened or endangered species known to be on or near the site. To the best of our knowledge, there are no threatened or endangered plant species known to be on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Previous mitigation for wetland removal included creation of 0.46-acres of enhanced, forested wetland. Previous planting in this wetland and the any new planting in the associated 50-foot buffer will be maintained with native vegetation as described in the Mitigation Analysis Memorandum. 5. ANIMALS a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: 1) Birds: hawk, heron, eagle, songbirds, other a. Red -winged blackbird, snipe, mallards, Canada geese, osprey 2) Mammals: lS,gr, bear, elk, bearer other 3) Fish: bass, salmon, trout, herring, shellfish, other a_ Lake Washington contains Chinook, Coho, and sockeye salmon, steelhead, cutthroat trout, bull trout, kokanee salmon, speckled dace, three -spine stickleback, northern squawfish, yellow perch, black crappie, largemouth bass, smallmouth bass, mountain whitefish, large scale sucker, longfin smelt, prickly sculpin — See Mitigation Analysis Memorandum (AES, 2000). b. Crayfish, freshwater shrimp, freshwater clams — See Mitigation Analysis Memorandum (AES, 2000). c. ALSO: Turtles (painted and slider) b. List any threatened or endangered species known to be on or near the site. Environmental Checklist 24 May 2006 Page 11 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA Chinook salmon, bull trout, bald eagle c. Is the site part of a migration route? If so, explain Adult Chinook Salmon in Lake Washington migrate past the site on their way to the Cedar River each summer. Juvenile Chinook pass the site on their way back to Puget Sound, and may spend some time rearing in the site vicinity. Sockeye juveniles rear in Lake Washington and may utilize the shoreline and offshore habitat along the project for rearing. d. Proposed measures to preserve or enhance wildlife, if any: None 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Electricity will likely be used for heating and cooling, Natural gas will be used for cooking and potentially heating. During final capping and construction, the only energy to be used is diesel to operate construction equipment. No manufacturing will be conducted on site. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No. The project will not affect potential use of solar energy by adjacent properties. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: Final building systems and energy conservation features will be determined during detailed design. At this time, the following systems are being evaluated: 1. Gray -water collection systems for irrigation 2_ Passive Solar Systems 3. Proper solar orientation to capitalize on views and to minimize undesirable solar gain. 4. Double exterior wall systems to create chimney -effect ventilation @ exterior wall. 5. Maximization of natural ventilation and sunlight in spaces that do not need blackout capabilities. 6. Raised floor systems throughout the facility for use ]IT and plenum 7. Passive/active techniques for heating and cooling such as "chilled beams" 8. Thermal heat pump systems utilizing shallow and/or deep heat sink and wells. Environmental Checklist 24 May 2006 Page 12 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste that could occur as a result of this proposal? If so, describe. The South Baxter remediation has restored a contaminated, abandoned industrial/manufacturing site to allow project redevelopment. Adherence to institutional controls will minimize the potential for releases during development construction and thereafter_ Where warranted, a site -specific health and safety plan will be prepared and used to limit worker exposure to hazards on site. 1) Describe special emergency services that might be required. The site -specific health and safety plan will include emergency contacts and procedures. 2) Proposed measures to reduce or control environmental health hazards, if any: Adherence to institutional controls will minimize the potential for releases during development construction and thereafter. Where warranted, a site -specific health and safety plan will be prepared and used to limit worker exposure to hazards on site. b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? There are no noises in the area that occur on a regular basis that will adversely impact the project. Interstate 405 is located near the site, although traffic noise is not expected to adversely affect the project. There is periodic railroad traffic on the adjacent rail line. 2) What types and levels of noise would be created by or associated with the project on a short-term or a long-term basis (for example: traffic, construction, operation, other)? During construction, there will be noise from construction equipment that will have minimal impact to adjacent uses. Impact -type noises will be limited and will occur during restricted hours to minimize any potential adverse impacts to adjacent uses. Indicate what hours noise would come from the site. These noises will occur during daylight hours and will vary seasonally. Once the building is enclosed, these noises will be contained within the enclosed building. Construction is anticipated to take approximately 18 months with approximately 6 months of exterior noise. Environmental Checklist 24 May 2006 Page 13 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA 3) Proposed measures to reduce or control noise impacts, if any: Any adverse noise impacts will be minimal and will likely be lower in frequency to the adjacent Interstate 405 and adjacent railroad. Exterior construction will be limited to daylight hours as permitted by the City of Renton. Contact with adjacent neighbors who may be adversely impacted will be made and information provided when loud noises, if any, will occur. The applicant is evaluating a request for restrictions on horn operation by the railroad at adjacent crossings. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? Current Use of the North Baxter Site: Vacant Current Use of the South Baxter Site: Vacant At the Baxter Property, wood treating operations ceased in 1981. Adjacent properties include: - Quendall Terminals, a former refining facility that is currently used for log sorting and storage, is located to the south; - Barbee Mills, a former lumber mill, is located south of Quendall Terminals; - Pan Abode, a cedar homes manufacturing facility, is located to the southeast; - Lake Washington Boulevard and 1-405 are located to the east; - Lake Washington is located to the west; - Condominiums and residences are located to the north. b. Has the site been used for agriculture? If so, describe. No, the site has not been used for agriculture in the recent past. c. Describe any structures on the site. Asphalt pad, a small one-story office building, and a small dock are located on the North Property. d. Will any structures be demolished? If so, what? The small one-story office building will be demolished. e. What is the current zoning classification of the site? Commercial/Office/Residential (COR-2) f. What is the current comprehensive plan designation of the site? Commercial/Office/Residential Environmental Checklist 24 May 2006 Page 14 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA g. If applicable, what is the current shoreline master program designation of the site? Urban h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. W i. Approximately how many people would reside or work in the completed project? Approximately 250 to 300 staff will work at the completed facility j. Approximately how many people would the completed project displace? None k. Proposed measures to avoid or reduce displacement impacts, if any: Not Applicable I. Proposed measures to ensure that the proposal is compatible with existing and projected land uses and plans, if any: Adjacent Use to the North: Landscape buffers and potential fencing will be provided to buffer the project from adjacent residential uses Adjacent Use to the South: Landscape buffers and fencing will be provided to provide necessary visual separation between the project and adjacent logging operation and storage and remediation activity. 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. No housing will be provided. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. No housing will be eliminated. c. Proposed measures to reduce or control housing impacts, if any: Not Applicable_ Environmental Checklist 24 May 2006 Page 15 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA 10. AESTHETICS a. What is the tallest height of any proposed structures), not including antennas; what is the principal exterior building material(s) proposed. The bulk of the building is approximately 50 feet in height. The indoor practice facility is approximately 120 feet from its lowest elevation. b. What views in the immediate vicinity would be altered or obstructed? Views from the lake will be altered. The site is currently vacant. Views to the lake from adjacent uses located to the north and south will not be adversely affected. Views to the lake from structures located to the east, across Interstate 405 may be altered above existing tree lines. Approximately 30 to 40 feet of view above existing trees could be obstructed by the highest building masses. The design of the facility has maintained view corridors to Lake Washington from adjacent properties. The bulk of the building on site has been sited furthest from the shoreline to mitigate visual impacts to the condos located to the north_ The majority of the site has no structures above grade, thus preserving views to the lake. As detailed design proceeds, these view corridors will be developed further. c. Proposed measures to reduce or control aesthetic impacts, if any: Traditional architectural devices to reduce the apparent scale and mass of the project are being explored including: 1. arcades 2_ horizontal expression lines at changes of materials and fenestration 3. roof treatments 4. fenestration and glazing systems 5. Setbacks of building mass from the shoreline 6. Maintaining view corridors to Lake Washington. At the lakefront, the office components are placed in front of high mass elements associated with indoor practice facility in order to minimize view impacts from neighboring properties. This approach occurs at the south facade as well. To the west, the building is entered at the second level, thus reducing the apparent massing of the fagade facing Interstate 405. To the north, landscaping will be incorporated at the building perimeter as well as the property line to buffer the facility from the adjacent residential uses located to the north. The majority of the site will have little or no structure above grade, which will effectively preserve a view corridor to Lake Washington over the majority of the site. 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce? What time of day would it mainly occur? No permanent field lighting will be provided. Thus, no glare or light is anticipated that will adversely impact adjacent land uses, or land uses located in other municipality with views of the properties from upland locations or across portions of Lake Washington. Environmental Checklist 24 May 2006 Page 16 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA b. Could light or glare from the finished project be a safety hazard or interfere with views? No. It is not anticipated that any light or glare will pose a safety hazard. c. What existing off -site sources of light or glare may affect your proposal? There are no off -site sources of light or glare that we are currently aware of that will impact the project. d. Proposed measures to reduce or control light and glare impacts, if any: Not Applicable 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? Due to the nature of operations and the personnel, provisions to secure the site and to maximize privacy will be made. Public access to the shoreline will be considered at the southwest corner of the site in a manner consistent with security and privacy needs_ b. Would the proposed project displace any existing recreational uses? If so, describe. None c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: Not Applicable 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on, or proposed for, national state, or local preservation registers known to be on or next to the site? If so, generally describe. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. A Cultural Resource Assessment (Larson, 1997) was performed for the Baxter Properties and properties south of Baxter in 1997. This assessment did not identify any cultural resources eligible for listing on the National Register of Historic Places were identified in the area. Literature review suggested that a Duwamish site may have been present at the historic mouth of May Creek, assumed to have been located on a nearby property south of the Baxter Properties. Environmental Checklist 24 May 2006 Page 17 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA c. Proposed measures to reduce or control impacts, if any: Monitoring for archeological materials will be included in development activities involving excavation in portions of the site designated "High Probability Areas" in the Cultural Resource Assessment (Larson, 1997). Monitoring could include having a professional archeologist on site to monitor any subsurface excavation to insure that no intact archeological materials or features are adversely affected by such activities. 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. Interstate 405 provides regional access to the site. The site is served by Lake Washington Boulevard, the primary access to which is via exit 7 (NE 44t" Street) from 1-405. Other vehicular access is also provided by Lincoln Avenue from the east, Ripley Avenue from the north and Lake Washington Avenue SE from the northeast via 44t" Street interchange. Two existing on grade crossings provide access to the site as shown on the attached site plans. Preliminary discussions between the Seahawks and the BNSF Railroad have commenced regarding a third (new) crossing, located halfway between existing crossings. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? The site is not served by public transit. The nearest transit stops are located at Park Ave N/N 33`1 and 116t"176t" c. How many parking spaces would the completed project have? How many would the project eliminate? New Parking: Approximately ±300 cars Displaced Parking: No parking will be displaced or eliminated d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private? Improvements will likely be required at the following areas: 1. Ripley Avenue 2. Existing at grade crossings @ BNSF Railroad right of way 3. Potential new at grade crossing @ BNSF Railroad right of way as indicated above e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. The Seahawks will continue to use air transportation at their current levels. Environmental Checklist 24 May 2006 Page 18 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. The proposed project consists of a single tenant office with spaces for approximately 150 to 175 staff with facilities to accommodate another 65 to 85 players at one time. Additionally, an approximate 12,000 g.s.f. medical office clinic may be provided in the building and is assumed here as a conservative traffic impact assumption. Given the nature of the uses, on a "typical" weekday it is anticipated that the project will generate approximately 1,160 daily trip ends with a total of 136 occurring in the weekday AM peak hour and 145 during the weekday PM peak hour. A more comprehensive study detailing the trip generation assumptions will be provided under separate cover. g. Proposed measures to reduce or control transportation impacts, if any: A detailed traffic impact analysis will be provided under separate cover. 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. Tel b. Proposed measures to reduce or control direct impacts on public services, if any. Not applicable 16. UTILITIES a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. The following utilities will be required. The existence of these utilities will be verified before detailed site design begins: 1. Fiber 2. DSL or T1 Telecommunication Lines Existing power lines easements @ the center of the site will be relocated. Existing storm sewer @ "broken -line" will be relocated as well. Environmental Checklist 24 May 2006 Page 19 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA C. SIGNATURE I, the undersigned, state that to the best of my knowledge the above information is true and complete. It is understood that the lead agency may withdraw any declaration of non -significance that it might issue in reliance upon this checklist should there be any willful misrepresentation or willful lack of full disc re on my part. Proponent: Name Printed: Ray Colliver Date: 6�2 e-1 , (D W Environmental Checklist 24 May 2006 Page 20 The Baxter Site Development Plan New Seattle Seahawks Practice Facility Renton, WA D. SUPPLEMENTAL SHEETS FOR NONPROJECT ACTIONS (These sheets should only be used for actions involving decisions on policies, plans and programs. You do not need to fill out these sheets for project actions.) Because these questions are very general, it may be helpful to read them in conjunction with the list of the elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not implemented. Respond briefly and in general terms. 1. How would the proposal be likely to increase discharge to water; emissions to air; production, storage, or release of toxic or hazardous substances; or production of noise? Proposed measures to avoid or reduce such increases are: 2. How would the proposal be likely to affect plants, animals, fish, or marine life? Proposed measures to protect or conserve plants, animals, fish, or marine life are: 3. How would the proposal be likely to deplete energy or natural resources? Proposed measures to protect or conserve energy and natural resources are: 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites, wetlands, flood plains, or prime farmlands? Proposed measures to protect such resources or to avoid or reduce impacts are: 5. How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses incompatible with existing plans? Proposed measures to avoid or reduce shoreline and land use impacts are: 6. How would the proposal be likely to increase demands on transportation or public services and utilities? Proposed measures to reduce or respond to such demand(s) are: Environmental Checklist 24 May 2006 Page 21 The Baxter Site Development Plan New Seattle Seahawks Practice Facility Renton, WA 7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or requirements for the protection of the environment. SIGNATURE 1, the undersigned, state that to the best of my knowledge the above information is true and complete. It is understood that the lead agency may withdraw any declaration of non -significance that it might issue in reliance upon this checklist should there be M illful misrepresentation or willful lack of full disclosure on my part. Proponent: A/ V'vvv v -- Name Printed:• �•�`'`'t' ��� Date: �/ . Environmental Checklist 24 May 2006 Page 22 April 10, 2006 Mr. Oint Chase Port Cal Udall Company C/o VLJlcan 113C. 505 5th Ave. S., StlJte 900 Seattle, WA 98104 Dear Mr. Chase: Re: Partial Certificate of the Completion for the Capital Portion of the Cleanup at the.l.l1. Baxter South .Parcel, Renton, WA k cology certifies that the capital portion of the cleanup required under the Consent Decree: and Clcan.up Action flan (CAP) dated April 4; 2000, has been completed at .1.14. Baxter South Parcel, Renton, WA, in accordance with applicable environmental laws, The capital l: ;rtion o l-the cleanup consists of the following cleanup activities: + Removal and off -site disposal of impacted sediment abovc the cleanup level of 100 nag/kg total PAH from Baxter Cove;_ Re-creation of wethmds adjacent to Lake Washington and bUfler restoration and enhancement; impact avoidance to species listed as threatened cinder the Endangered Species Act through hydraulic isolation of the protect work and the timing of in -water work, + Densc non -aqueous phase liquid (DN1,AI1L) t•emoval from sokmr e monitorin'.; well BAX-14-, + l xcavation of light non-agc►cous licluicl (LNAPL) impacted sail in the tank farm area based on an action level o(' 1,000 mg/kg total PAH and off -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 E-as' March 28, 2006 Page 2 • Ili -situ soil stabilization of inipacted soil near the Butt Tani: and Baxter Lagoon area based on an action level of' 1,000 mg/kg total PAI-1. to remove the long-term sourcc of groundwater impacts. The: above remedial actions Nvore defined as the capital portion oFthe remedial action in the CAP, which includes soLircc rcrnediation (DNAPL removal, sail excavation and disposal or treatment, in -situ stabilization) and v%,ctland mitigation. Eeolo ,y received and reviewed three quarterly growndwatcr monitoring reports by IZ TFC, dated November 10, 2005, December 22, 2005 and March 31. 2006. The groundwater data collected to date have rnct the Model Toxics Control Act (WFCA) cleanup levels. Port Quendall Company (PQQ will continue the groundwater monitoring according; to the schedule specified in the CAP. Fcology also received and reviewed the "Baxter Cove Wetland Monitoring Report, Year 1, Year 2 and Year 3" by RE'l EC, dated October 14, 2003, November 3, 2004, and I3eeeinber 22, 2(}{}5_ Fec>logy recognize , that PQC' is rneetiilb the requirements of Corps of Engineers dNetland Permit Number 2000-2-0051 2, and PQC. will continue the we -eland monitoring program according to the. schedule specified in the CAP. However, the following remedial actions have not bccn completed: Capping of residual soil impacts (o prevent direct contact by humans and institutional controls to enseire cap integrity into the future on both South and North Parcel: + Iniplernentation of institutional controls to prevent future groundwater extraction and provide for [lie continued integrity of the cap neology understands that the capping of residual soil impacts may be (Jepei)dent oji the site redevelopment schedule since landscaping, parking lots, and building; foundations wsed are all projected to comprise portions of the cap. If you have any questions, .please call ine at (425) 649-7187, Sincerely 5Ltnny Lin Vecker, P.T. Toxics Cleanup Program .......... . ................................ . . .. .. .. ......... .. ..... .. . .. .......... ------------ — ----- ... ............... qp LO Ix"n" ......... JIJ/ . ..................... so t. 's E. . . . . . . .. . . . . j 1A T� 0 1901 mam sirxeg, suifa kin 3 Criy: M0 V14108 lax: ... ' 5 ve X JA �s i : �.. gg TLLyy;; e�rrrr }}ff hl L'.E�i iV 1. IC .,.... SftV Vrol. .F CA Eeginaors f » CONCEPTUAL x_ PRELIMINARY GRADING PLAN Baxter Development ProJ Ct - Phase 1 ci 01 0 z LLJ DZ 0 CL Luzo C) JAL 0 Z Is Z) 0 !F IV, ttyytv r N�l W, Ll--m (1) W cu .0 CL 0 L. CL -1-+ c (1) E n 0 4-0 x cu m F*4 PRELIMINARY STORMWATER TECHNICAL INFORMATION North and South Baxter Site Development Renton, Washington 25, 2006 i MAGNUSSON KLEMENCIC ASSOCIATES PRELIMINARY STORMWATER TECHNICAL INFORMATION North and South Baxter Site Development Renton, Washington May 25, 2006 MAGNUSSON LEMENCIC ASSOCIATES 1301 FiNhAvenoe, Soile 320C Seattle, Wwhinglon 98101-2699 T: 206 292 1200 F: 206 292 1201 MAGNlJSSUN � KLEMEN[UCASSOCIATES � Section _ Project Overview .......... .............................. ... ... l Section U. Preliminary Conditions Summary ... ........ l Section Ill. Off -site Analysis .. ... ................. .....'................................... 4 Section !K Retention/Detention Analysis and Design .. ... ... ... ... ... ... 4 Section V. Conveyance System Aoo|yn|s and Design .... ... ... ................. 4 Section VI, Spodu| Reports and Studies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 SoctinnYU. Basin and Community Plan Areas 4 Section V|U. Other Permits .. .. .... ... ... ................................. 5 Section |X. Temporary Erosion and Sedimentation [untm| Analysis and Design 5 Section X. Bond QoonhNns Workzhout, Retention/Detention Facility Summary Sheet And 0ec|orohvn of Covenant.. ................................................... 6 Soct)nnX|. Maintenance and Operations Manual .. ... ... .... ... ... .... ... . 6 Preliminary Stormvvoter Technical Information Table of Contents PRELIMINARY STORMWATER TECHNICAL INFORMATION i MAGNUSSON KLEMENCIC ASSOCIATES MAGNUSSON KLEMENCIC ASSOCIATES INTRODUCTION This report documents the stormwater and drainage design approach and proposal for the North and South Baxter Site Development project. The report has been prepared concurrently with the Shoreline Substantial Development Permit Submittal using the guidelines for the Stormwater Technical Information Report (TIR) from the 1990 King County Surface Water Design Manual. Figure i 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 2). The east side of the site abuts the Burlington Northern and Santa Fe Railroad Right -of -Way. The site is located in the Gypsy Creek drainage basin. The proposed project includes construction of a new sports practice facility on a vacated industrial site. EXISTING DRAINAGE The existing site is currently vacant. 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 off -site stormwater from the east side of the site to Lake Washington. An isolated created wetland may exist at the southwestern corner of the site. It appears that the potential wetland receives stormwater runoff as surface flows from a portion of the southern part of the site. PROPOSED DRAINAGE There will be three basic storm drainage systems proposed for the project: ■ Stormwater runoff from the fields will be collected through a subdrainage system ■ Stormwater runoff from the roof areas will be collected with roof drains ■ Stormwater runoff from the vehicular impervious surfaces will be collected and treated with natural and/or conventional drainage facilities. Stormwater runoff from each area will be dispersed as non -concentrated sheet flow that will drain toward Lake Washington as in the existing condition. The only portion of site stormwater runoff that may drain to Lake Washington via a storm drain would be the water quality storm event runoff from the loading dock. Because of grade constraints, the stormwater runoff from the loading dock may be routed through a water quality treatment facility, a flow splitter to bypass stormwater runoff from larger storm events, and then through the existing outfall to Lake Washington. SITE CONDITIONS The project 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. Preliminary Stormwater Technical information a - North and South Baxter Site Development, Renton, Washington MAGNUSSON KLEMENCIC ASSOCIATES Figure 3 shows the soils map for the area that was prepared by the Soil Conservation Service in the 1 970s. For the purposes of the drainage analysis, all of the soils were treated as belonging to Hydrologic Soil Group D, high runoff soils. CORE REQUIREMENTS A pre -application meeting was attended by the Owners, Design Team, and City staff on May 3, 2006, and conditions for the project were identified. The drainage conditions established for the project consist of applying the 1990 King County Surface Water Design Manual criteria for drainage design and stormwater management. Core Requirement 1: Discharge at the Natural Location The drainage from the improved areas will continue to drain to Lake Washington as sheet flows. The outfall location for this system will not be changed. Core Requirement 2: Off -Site Analysis An off -site analysis is not requ+red for this project because the site is adjacent to Lake Washington and improvements on site will not impact upstream drainage conditions. Therefore, an off -site analysis is not included in this report. Core Requirement 3: Runoff Control Runoff control facilities for biofiltration have been designed for the project, and are documented in this report. Peak rate 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-year design storm. Core Requirement 5: Temporary Erosion and Sedimentation Control (TESC) A TESC plan will be prepared for the project during the construction document phase, and will be added to this report as an addendum. Core Requirement b: Maintenance and Operation Maintenance and operation requirements will be identified for the project during the construction document phase, and will be added to this report as an addendum. SPECIAL REQUIREMENTS Special Requirement 1: Critical Drainage Areas Does not apply. Preliminary Stormwater Technical Information North and South Baxter Site Development, Renton, Washington MAGNUSSON KLEM1 NC1C ASS QCIATE5 Special Requirement 2: Compliance with on Existing Master Drainage Plan Does not apply. Special Requirement 3: Conditions requiring a Master Drainage Plan Project is below the thresholds. Special Requirement 4: Adopted Basin or Community Plans Does not apply. Special Requirement 5: Special Water Quality Controls Specia# water quality controls have been included in the design of the site. Natural and/or conventional water quality treatment facilities will be constructed and/or installed to treat stormwater runoff from the vehicular impervious surfaces). Special Requirement 6: Coalescing Plate Oil/Water Separators Project is below the thresholds_ Special Requirement 7: Closed Depressions Does not apply. Special Requirement B: Use of Lakes, Wetlands, or Closed Depressions for Peak Rate Runoff Control The project does not propose to use existing features for peak rate runoff control. Special Requirement 4: Delineation of 100 Year Floodplain The 100-year floodplain is the edge of Lake Washington, at the westerly edge of the site. Special Requirement 10: Flood Protection Facilities for Type 1 and 2 Streams Does not apply. Special Requirement 11: Geotechnical Analysis and Report Does not apply. Special Requirement 12: Soils Analysis and Report A Geotechnical report is being prepared for the project. Based on geotechnical report data for the site, the existing site soils would have characteristics compatible with Hydrologic Soil Group D. Preliminary Stormwater Technical Information North and South Baxter Site Development, Renton, Washington MAGNUSSON KLEMENCIC ASSOCIATES SECTION IIL_.SOEF-_SITE ANALYSIS._.__ An off -site analysis is not required for this project because the site is adjacent to Lake Washington and improvements on site will not impact upstream drainage conditions. Although the existing 24-inch storm drain crossing the site will be relocated, the conveyance capacity will be maintained so that upstream drainage conditions are not negatively impacted by the project. Therefore, an off -site analysis is not included in this report. • ► ► • ► 1I&MIZI I• Peak rate 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 King County Surface Water Design Manual requires biofiltration of runoff when over 5,000 square feet of new impervious area subject to vehicular use results from a project. Runoff control facilities for biofiltration have been designed for the project. The facilities include natural (bio-retention and ecology embankment) and/or conventional (wetvault or StormfilterT^4) systems. In accordance with King County Special Requirement 5, Special Water Quality Controls are required for projects that result in more than I acre of new impervious area. Because approximately 3.7 acres of new vehicular impervious surface will be created for the project, Special Water Quality Controls will be required. The runoff control facilities identified for the project meet the requirements for enhanced treatment and will meet the objectives of the special water quality controls requirement. The design treatment volume(s) are based on a design storm where the precipitation is 0.67 inches, which is one-third of the 2-year, 24-hour rainfall. Conveyance improvements were designed for the new parking lot and plaza area. The Rational Method was used to compute the peak intensity 25-year runoff rates, which were used to size the proposed storm drain pipes. -S=LQN VI: SPECIAL REP4RTS_AND...S..T_U.DI_ES None, None. Preliminary Stormwater Technical information North and South Baxter Site Development, Renton, Washington MAGNUSSON KLLMENCIC A550CIATES None. SECTION IX: TEMPORARY EROSION AND SEDIMENTATION CONTROL ANALYSIS AND DE:SI.GN___ A TESC Plan will be prepared for the project, and included in the report as an addendum. The plan will meet the minimum TESC requirements as discussed below. TESC REQUIREMENTS TES( Requirement 1: Clearing Limits Clearing limits wid be shown on the plans. TESC Requirement 2: Cover Measures Cover measures will be addressed in the TESC Pion Notes. TESC Requirement 3: Perimeter Protection A sediment retention barrier will be shown on the plans. TESC Requirement 4. Traffic Area Stabilization The stabilized construction entrance will be shown on the plans. The TESC Plan Notes will indicate state water quality standards are applicable to construction site runoff. TESC Requirement 5: Sediment Retention A sediment retention system will be shown on the plans. TES[ Requirement b: Surface Water Control Interceptor swales will be shown on the plans. TESC Requirement 7: Dust Control Air quality will be addressed in the TESC Plan Notes. TESC Requirement 8: Wet Season Construction Wet season construction will be addressed in the TESC Plan Notes. Preliminary Stormwater Technical Information North and South Baxter Site Development, Renton, Washington MAGNUSSON KLEMENCIC A5500ASES TESC Requirement 9: Construction within Sensitive Areas and Buffers Construction within sensitive areas and buffers will be shown on the plans and addressed in the TESC Plan Notes, TESC Requirement 10: Maintenance Maintenance will be addressed in the TESC Plan Notes. TESC Requirement 11: Final Stabilization Final stabilization will be in accordance with the landscape plans for the project. SECTION X: BOND QUANTITIES WORKSHEET, RETENTION/DETENTION FACILITY SUMMARY SHEET AND D-CI_ARATIOW_OF None. OPERATIONS The project provides natural and/or conventional stormwater treatment facilities to treat runoff from the new vehicular impervious surfaces. The stormwater 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 part of the Owner aside from maintaining the facilities. MAINTENANCE The stormwater treatment facilities will require periodic inspection and cleaning to 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 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. REFERENCES Surface Water Design Manual, King County Surface Water Management. 1990. Pre -Application Meeting with City of Renton Staff. May 3, 2006. Preliminary Stormwater Technical Information North and South Baxter Site Development, Renton, Washington APPENDIX A FIGURES i MAGNUSSON KLEMENCIC ASSOCIATES King County Sullding and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET ProjectOwner �oo�u. �Jp'l`6tNSfi Address `��+t~ul: Sc gu+fl✓ oa cv4 Phone Project Engineer 2960J A. 4'-n14A 6$ Company 44A4,0us5uoJ (Ct,+E1K1W c.+c AS%oc Address Phone �'- W - /zoo 0 Subdivision 0 Short SubdiVislon 0 Grading 0 Commercial EFJ-61her $dRL 5v9$ r" r�At ;Prr P44M c Community C !TY 6 f ,-j*e4 4roi4 Drainage Basin &yPSy M6JS K 0 River Stream Critical Stream Reach Depressions/Swales L� Lake AVJ*<_4.oj t^ TA C A-V- 4- WA".SA, Cl Steep Slopes Lakeside/Erosion Hazard Page 1 of 2 Project Name "J°X-r# d.e'0JW4 $A-)erf e n Location Township Range Section Project Size ( AC Upstream Drainage Basin Sized AC _ C] DOF/G HPA 0 CDE 404 DOE Dam Safety 0 FEMA Floodplain 0 COE wetlands 0 Floodplain Wetlands T 0 Seeps/Springs High Groundwater Table 0 Groundwater Recharge Other [Shoreline Management 0 Rockery [] Structural Vaults C7 Other 0 HPA Soil Type Slopes Erosion Potential Erosive Velocities r Sli,1e.t. f,�XtS4' ^, 4-Sr *AIX L.ecw 'M Ly�v��.t'1rf�, 0 Additional Sheets Attatclied f�IQ,r1AMA99 Page 2 of 2 0 a a 0 a 0 King County Building and Land Development Division TECHNICAL INFORMATION REPORT.(TIR) WORKSHEET REFERENCE Ch. 4 - Downstream Analysis Additional Sheets Attatched MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION 21' Sedimentation Facilities L� I Stabilized Construction Entrance EZ� Perimeter Runoff Control Y Clearing and Grading Restrictions EZ' Cover Practices D? Construction Sequence 0 Other EZf Grass Lined Channel d Pipe System (] Open Channel 1] Dry Pond 0 Wet Pond LIMITATIOWSITE CONSTRAINT E:1 Tank CYI� Vault 0 Energy Dissapator 0 Wetland E] Stream Brief Description of System Operation 1 4-TV94 t- A,rt, (;flroy tTron? f ( w---rvAv Lrj Facility Related Site Limitations Reference Facility E::] Cast in Place Vault E-1 Retaining Wall 0 Rockery > 4- High EJ Structural on Steep Slope Limitation E::] Other MINIMUM ESC REQUIREMENTS FOLLOWING CONSTRUCTION [Z- Stabilize Exposed Surface [^ Remove and Restore Temporary ESC Facilities Clean and Remove All Silt and Debris Ensure Operation of Permanent Facilities (] Flag Limits of NGPES 0 Other E::] Infiltration 0 Depression Flow Dispersal O Waiver Cl Regional Detention thod of Analysis 51;v Compensafion/Mltigation of Eliminated.Site Storage ' 810 — Yet-,T6.wno-ru "r4s. 8COt.04, y 0-^11kN t or a civil engineer under my supervision have visited the site. Actual site conditions as observed were incorporated Into this workshest and the atiatchments. To the best of my knowledge the information provided here is accurate. = Additional Sheets Attatched 0 Drainage Easement Access Easement [] Native Growth Protection Easement Tract �] Other fay F/41v" 1 1/90 626 �i L 596 If `4 -......i�.a........,,m.,m..-.-.......m.............. i .,..,..,..,..__ ._, ..r..._........... .,..,.....,., 1 f 29 1 w ram, s e N 4�tt *NI $WN PAW COLD" F POINF Ito _, sk � B LAKE 1 Y � la � 8 !n Y F�S a c {-' d4 r jig092 =sf@ ms i. t?�usM"° 'A526ii ® Y006 CNA'NFCFM AKCHITECT'�. LLC t"V-AM L-U L-]12I CRAWFORD ARCHITECTS, LLC 1901 main streat, suite 200 Kansas city, mo 64108 tel: 816.421.2840 fax: 816.421.2850 PROJECT KC-045-05 WETLAND E O ca or O GYPSY SUSBASiN DRAINAGE WETLAND ID NORTH J.H. BAXTER LEGEND M/W Area of remediation impact along the shoreline —F Less than 50% wood waste (no action, capping, partial capping, partial dredge, or complete dredge; to be determined) Dredge to 6' and replaced with clean material -- to original grade Dredge to 3' and replaced with clean material to original grade l 3' cap with clean material or cap with redevelopment /� Excavated to required depth to remove =Z/2 contaminants orsludge; in situ stabilized to 18' below ground surface or replaced with clean material to capped grade (See Note 2) Blackberry Shrubs -fti'L' .w>c �I-.'- Trees NOTE: 1. ALL HABITAT, WETLAND, AND PROJECT FEATURE LOCATIONS AND QUANTITIES ARE APPROXIMATE. 2. SEE FINAL CLEANUP ACTION PLAN FOR ACCURATE CLEANUP DETAILS. QUENDALL j TERMINALS Elm ' { , NORTH 0 100 200 3DO 4X 14 17& APPROXIMATE SCALE iN FEET 4SMASSOCIATED REMEDIATION ACTIVITY AND WETLANDS AND SHORELINE VEGETATION FIGURE 1 EARTH SOUTH J,H, BAXTER PARCEL DATE 4/5/00 SCIElyces, INC REMEDIATION FOOTPRINT RENTON, WASHINGTON PROJ. NO. KB991426 WETLAND DETERMINATION REPORT` ON THE JAG DEVELOPMENT PROPERTY Renton, Washin-ton cp Prepared for: Mr. Jinn Spitze CNA ARCHITECTURE GROUP 777 - 108'}' Avenue S.E., Suite 400 Bellevue, Washington 98004-5118 CAAX0015 Prepared by: DAVID EVANS AND ASSOCIATES, INC. 415 118th Avenue S.E. Bellevue, Washington 98004-6477 Devised May 1997 EXECUTIVE SUMMARY David Evans and Associates, Inc. (DEA) conducted a wetland recorinaissatice of the JAG Devel- opment Property in the City of l"enton, King County, Washington on October 25, 1996 (DEA, 1996), Because evidence of jurisdictional wetland conditions was found, a wetland delineation was performed in February 1997 and is documented in this report. The subject property is located at 44th Street on Lake Washington in the City of Renton, King County, Washington (Section 29, Township 24N, Range 5E W.M.). ` lie property is approximately 65 acres consisting of five parcels: the Barbee Mill parcel (about 20 acres) on the south; the fort Quendall parcel (about 20 acres) in the middle; tic Baxter Mill parcel (about 17 acres) on the north, the "Para -abode" parcel (about 6.3 acres) located east of the main site and east of Lake Washington Boulevard, and a two -acre eastern parcel between 1-405 and the southbound off -ramp. At the time of this investigation, the Barbee Mill site was fully occupied by active sawmill operations and most of Port Quendall parcel was used as a log storage yard. "I-hc Pan -abode property was occupied by industrial uses. The Baxter Mill parcel was unused except for storage of several large piles of bark mulch. Eight jurisdictional wetlands wvere identified on the subject property using 1987 Corps of Engineers methodology as required by the City of Renton. Each wetland has been mapped and are sumrilari-r_ed in the table below. All on -site wetlands are in previously disturbed areas and have formed in old fill rrlaterials or in excavated areas. Alt would be classified as Category 3 wetlands by the City of Renton because they meet the criteria of hydrologic alteration and soils alteration (Renton, 1992). Wetland Surninary Table Wetland On-sitcA.rea in CiEy.of Ret46n Rcgtii cd Briffer -; (Parcel location) Acres (square feet) - USFWst CISSSificatlon . ' -CafCo01 A (Quendall) 0.195 palustrine forested 3 25 (s,527) B (Quendall) 0.374 palustrinc forested 3 25 (16,284) C (Quendall) 0.171 palustrine scrub -shrub/ 3 25 (7,444) emergentfopen water I) (Baxter) 0.080 palustrine 3 25 (3,483) scrub -shrub E (Baxter) 0,230 palustrine scrub-shnib/ 3 25 (10'.027) emergent/open water F (Easi) 0.150 palustrine forested 3 25 (6,528) G (Fast) i 0.015 palustrine emergent 3 25 (661) li (13arbec) 0.141 l palustrine emergent 3 25 (6,151) Total arcs: _ I -M (59,105) — — 1, United States Fish and Wildlife Servicc (Cowardin et at., 1979). h:lduc�area 4ejatrest wpd0cs1caaz1caax0015lcoc0005.doc Welland Determination Report 3AG Dcveiopment Property m Table of Contents EXE,CUJIVESUMMARY .... .................................................................................................... ^i l. INTRODUCTION L.....--'............................ ............ ............................................. .............. 3 Z' METHODS- ..... .................. ^...................................... -............................................. -'........... 2 Z'] Purpose ............................................................................................................................. Z 2.3 Preliminary Research ........................................................................ ^............................ % 2.3 Site Ioveut�ut�nz.^--'_-----^.��~'----�_---_-..---.------~-...~.--'----------'5 2.4 T9et|uud Function 3. RESULTS .................................... ..................... ...................................................................... 6 3.1 Site History ......................................................................................................... ............ 6 3.2 Vegetation ............................................................................................... ....................... 7 3-3 Soils __--._---..^^---'--._-''-~-------,..-.'..'-----'---'-'--'-'~-~.-.-...7 3.4 11vdro[ogy........... .................................................................................. ......................... 0 3-4.1 {}w:nuU Site Hydrology........................................................................... ............. 8 3.4.2 Strcanu................................................................. ..................... ....................... _.� 3.-5 Wetland Dctrrxuinntioo............................... .................................. .-----'-----'-'9 �'6 YVatixmjPuockoou-'-._--,.._--___.--'-------._.....'.'_—._-------l0 4. l<EGUl.ATY}RYIN{Pl.ICATlf]NS...................................................................................... Il 4.1 Wetlands ........................................................ .......... ..................................................... 1l -4.2 Streams ...................................................... ...................... '............................................. l2 5. DE-'FERENCE'S.............. ....................................................... -'.................... ......... ............... l3 Wduouoel,mimuirmneporl APPENDICES Appendix A. Corps Certification Documents Appendix B. Plant Indicator Status Categories Appendix C. Sample Plot Data Sheets Appendix D. List of Plant Species Appendix E. Wetland Function Assessment Rating Forms LIST OF FIGURES Figure1: Vicinity Map.. ............................................... .................. --- ---- Figure 2: Existing Wetlands................................................................ ..------------ ..---.4 LIST OF TABLES Table I: Wetland Suirimaty............................................................................. ...........9 Table 2: Functional Assessment Summary...................................................................................9 h: Voc-area'vwresl wydocs l-Oaxlcaax0015lroc0005. doc Wcttand Determination Report JAG Dcvelopmmt Property tit PREFACE This report has been prepared for the use of CNA Architecture Group and (lie project consultants and proponents. In preparing this report David Evans and Associates, Inc. (DEA) has used the site information and proposed development plans as referenced herein. Findings reported herein are based on information gathered in the held at the time of investigation, DFA's understanding of the Corps of Engineers Wetland Delineation Manual (1987), and DEA's understanding of federal, state and local regulations governing wetland and stream areas. Prior to preliminary and final design or any construction, all appropriate regulatory agcncies should be contacted to verify the findings of this report, and to obtain appropriate approvals and permits. The Nvetland boundaries, wetland and stream classifications and recommended buffers are DEA's best professional opinion based on the circumstances and site conditions at the tirne of our study. The final wetland boundary determination, classification of wetlands and streams, and the required buffers and setbacks are made by the appropriate federal, state and local jurisdiction. Two of the three wetland delineators for this project are certified by the Corks of Engineers for wetland delineation. Certification documentation is included in Appendix A. la: ldoc-area lnetresl wpdacslcaaz lcaaxOO i 5lrpl0005. doc Wetland Determination Deport JAG Development Property lE . INTRODUCTION David Evans and Associates, Inc. (DEA) conducted a wetland reconnaissance of the JAG Development Property in the City of Renton, King County, Washington, on October 25, 1996 (DEA, 1996). Because evidence of jurisdictional wetland conditions was found, a wetland delineation was performed in February 1997 and is documented in this report. The subject property is located at 44th Street on Lake Washington in the City of Renton, King County, Washington (Section 29, Township 24N, Range 5E WA4_) (Figttre 1). The property is approximately 65 acres consisting of five parcels: the Barbee Mill parcel (about 20 acres) on the south; the Port Qucndall parcel (about 20 acres) in the middle; the Baxter Mill parcel (about 17 acres) on the north; the Pan -abode parcel (about 6.3 acres) located east of the main site and Lake Washington Boulevard, and a two -acre eastern parcel between I-405 and the southbound off - ramp (Figure 2). At the tinic of this investigation, the Barbee Mill site was fully occupied by active sawmill operations and most of Port Qucndall parcel was used as a log storage yard. The Baxter Mill parcel was unused except for storage of several large piles of bark mulch_ 2. METRODS 2.1 PURPOSE The purposes of this study were: 1) to identify, delineate, and describe any wetlands on the subject property and 2) to evaluate the wetland functions of any wetland present. Performance of these tasks involved three interrelated steps: preliminary research, site investigation, and wetlands deter-mination. 2.2 PREL'IMIitiARY RESEARCH Published information about local environmental conditions was reviewed for evidence of wetlands on the subject land parcel. The main information sources reviewed included: Soil Survey of King County Area, USDA Soil Conservation Service (SCS), 1973; • National Wetland Inventory (NWI), Renton Quadrangle, 1:24,000, USDI Fish and wildlife service, 1988; • Renton Quadrangle (1:24,000), United States Geological Sutvey (USGS), 1950; • Hitchcock, C.L,. and A. Cronquist. 1973. flora of the Pacific Northwest. Seattle, washingtoil: Reed, Jr., P_B. 1988. National List of Plant Species that Occur in Wetlands: 1988 Northwest (Region 9). Biological Report 88 (26.9). U.S. Nish and Wildlife Service, Inland Freshwater Ecology Section. St. Petersburg, Florida. [Pp.861; • Aerial photographs, Walker and Associates, Inc. 1936, 1946, 1956, 1974, 1985, 1990, 1995; i�: Idac-arccrY�rurresY r. pdoesYcaaxicaaz00! SYrpi(JOOS.doe wetland Determination Report JAG Developmcnt Property 2 SOURCE.• THOMAS BROTI-0:RS, 1995 JAG. DEVELOPMENT SITE "AVID -ANS AND Figure 1: Vicinity Map LAKE tiWASHINGTCN t _KTLAND -A- 6.527 SO. FT. (095 ACA -FIARaEt NMI- N WsnAM) 'H- WETLAND �c- 7'4 44 So FT, 6.1f )I SO, Fi. 0,141 AC I fl 171 AC'± X WEND e" 160374 AC.2TI8-A4 SO.. T. wETLANO 'E t06027 SO FT. .230 AC.± pl— -TLAND -0- 3,483 SO. FL 0.080 AC.-.t Olt, -'�QYPSY CREEK DRAiNA0E 6,526 no R. 0.750 AC. -wETLAbC) - 0 so. Fl. 300 600 60 61 Di 5 AC. \� SCALE: 1'm300' JAG DEVELOPMENT PROJECT Figure 2- Wseng Wedands EIS Framework Plan, JAG Development Planned Action, City of Renton, Huckell/ Weinman Associates, Inc. 1996; David Evans and Associates, Inc- 1994. Wetland and Habitat Reconnaissance on the Baxtcr Mill Property, Renton, Washington; Terra Associates, Inc. Wetland Delineation Report for The Baxter Mill Property, 1993; and King County 1990. King County Sensitive Areas Map Folio. �.; SITE INVJ'.S`fIGATION February 19, 207 21, and 27, 1997, DEA biologists conducted a field investigation for the l'Sence and extent of jurisdictional wetlands on the subject property. Tlie vcgetation, soils, and --t'irology of the site were examined according; to the 1987 Corps of Engineers Wetland ),,lineation Manual and subsequent Corps guidance. Twelve 0.01 acre sampling plots were "tablished in areas of hornogenous vegetation.. Plant species on the site were identified Olitchcock and Cronquist, 1973) and vegetation was considered hydrophytic (adapted to wet conditions) whcn over 50% of the dominant plant species had an indicator status of facultative, :�ukative wetland, or obilonte wetland (Appendix B). In accordance with the methodology, soil m <.in7ples were takers at all sapling plots as well as other points on the site, and were examined ,,,r the following indicators of hydric conditions: thick organic layers, glcying, low soil chroma trnatrix chrorna 1) or mottling (matrix chroma I or 2)- Hydrology of the site was evaluated .hrough observation of surface water, soil saturation, groundwater level, and evidence of drainage patterns. Areas in active industrial use such as the Quendall parcel log storage yards }nd the Barbee Mill operation were not examined because hydrophytic vegetation would not 1"'Wif had an opportunity to develop under this level of disturbance. Wetlaalds «ere defined as areas where vegetation, soils, and hydrology reflected 1�ydric conditions. the boundaries of the wetlands on the site were marked with orange flagging, ar-id «were surveyed and nxappcd by Bush, Roed, and Hitchings, Inc. The area of each wetland was <<tilculated during survey plotting. Alt wetland boundaries are subject to verification by agencies having jurisdiction. 2.4 NVETLAND FUNtCTION ASSESSMENT Wctlar'ds ai-c known to perfbrm significant functions in the ecosystem, some of which are of irn- mediate value to hunt<an society. Although these functions axe complex, interrelated, and difficult to quari fy, severai alternative methods have been developed to assess wetland functions for spe- cific wetlands. A semi -quantitative method was used for this project (Cooke, 1996). Eight cate- - ies of wetland functions are defined in this method: flood/storm water control, Ease flow and oroond water support, erosion/shoreline protection, water quality improvement, natural biological support, overall habitat functions, specific habitat functions, and cultura€Isocioeconornic functions. The rneth« dology includes a form that is used for rating wetland functions. For each wetland, a given number c)f points for each function based on physical characteristics such as size, nearby land h: �dooareaU�armslis�dUcslcaarlcaas0015trnt0005.dPc wcdand Detcrmivation Report JAG Dcvdopineftt Property 5 uses, vegetation types and densities, and drainage patterns can be assigned and recorded on the form. The methodology states that it is not intended to he used to assign an absolute value (i.e., high, nic:dium, low) to a function present in a wetland or to an individual wetland. Rather, it is designed to "determine the presence and relative importance of functions within the wetland" or to "rank individual wetlands by function against other wetlands in the sanie draina.ge system" (Cooke, 1996). 3. RESULTS The 1vWI Renton Quadrangle indicates palustrine scrub -shrub and palustrine emergent wetlands along the Lake Washington shoreline in the central part of the property. In addition, May Creek is shown as a riverine unconsolidated bottom habitat type (USDI, 1988). The King County Sensitive Areas Map Folio indicates no wetlands on the property, but shows the on -site reach of May Creek as a Class I stream (Icing County, 1994)_ A 1993 investigation of the Baxter parcel found one wetland located along the eastern on -site railroad grade (Terra Associates, 1993). The 1994 DEA site reconnaissance identified several areas of potential wetland, each of which was examined and documented during the current study. Wetland data plots documented fbr the current investigation are included in Appendix C and located in figure 2. A list of plant species observed on the site is presented in Appendix D. 3.1. SITE HISTORY The southern parcel of the property has been occupied by the Barbee Mill since before 1946. According to aerial photographs, it has been relatively unchanged since. 1956_ May Creek was relocated between 1936 and 1946, and it presently extends along the southeastern side of the property (Figure 2). Its general channel morphology has been unchanged since at least 1974. The central fort Quendall parcel is an active log yard inuuediately north of the Barbee Mill opera- tion (Figure 2). Almost the entire parcel presently experiences continued disturbance from these activities. The site was used as a creosote refinery from 1917 tluouQh 1969. Thereafter the site was used primarily as a storage area for operations occurring on the Baxter parcel. A lagoon area, pres- ently divided into adjoining North and south l goons, appears to have been created between 1969 anci 1974 (figure 2). The shoreline in this area has been relatively undisturbed since 1995. The northernMost Baxter Mill pat-cel was developed in 1955 as wood treating plant and storage yard, «loch was in operation until 1981. Aerial photographs confirm that by 1985 the site had been aban- doned. At the time of the investigation, the site was used only for storage of large piles of bark mulch. The Pan -abode property was developed for industrial use between 1956 and 1968 according to available aerial photographs. At the (line of this investigation, the entire parcel was occupied by the Pan -abode prefabricated house -building operation. The eastern two -acre parcel was modified during the construction of 1-405. Ditches and/or stream channels are clearly evident in the 1956 and in 1968 aerial photographs. The channels h:1�IocrcalnINresliwpdacslcaarlcea.c0013 Mrpt 00p3. doc Welland Determination Report JAG Development Property 6 were rerouted to accommodate the southbound off -ramp- These channels now border the parcel on the east and the north. 3.2 VEGETATION The Barbee Mill parcel and much of the fort Quendal€ parcel are continually disturbed by active mill operations and storage and transport of logs, arid include few areas of natural vegetation. Most of the vegetated on -site area of the Barbee Mill consisted of mown lavnhs along May Creek and alone the railroad right-of-way at the eastern parcel boundary (Data Plots 10 and 11). The inactive portions of the Port Quendall parcel, as well as the entire Baxter parcel, contained significant areas of sparse vegetation. The Baxter parcel was almost devoid of vegetation in 1985 according to aerial photographs from that year. By 1996, vegetated areas were concentrated in the vicinity of tic former tank farm, the Lake Washington shoreline, and eastern margin along the railroad grade. These areas were dominated by sapling- and seedling -size black cottonwood (Popidus balsaniifera), red alder (Alnus rubra), and willow (Salix spp.), as well as soft rush and reed canarygrass (Phalaris arundinacea) (Data Plots 3, 12 and 13). The shoreline areas included more hydrophytic plant species including hardback (.Spiraea douglasii), common cattail (Typha latifolia), and yellow flag iris (Iris pscudacorus) (Data Plots 1 and 2). Limited areas on the eastern and western margins of the property included more mature trees (Data Plots 1, 7, and 8)_ Himalayan blackberry formed patches throughout less recently disturbed portions of the site. Small depressions supported emergent species, including soft rush (Juncos effusus), reed canarygrass, sickle -leaved rush (Juncus folcaru.$), and bentgrass (Agrostis sp.). The small eastern parcel was occupied by forest and scrub -shrub vegetation, dominated by black cottonwood and %V llo%v trees and thick shrub -layer growth of Himalayan blackberry (Rufus discolor) and Japanese knotweed (Po4x onum cuspidatum) (Data Plots 4 and 5). The eastern parcel also inciudcd a small patch of' crb-layer reed canatygrass (Data Plot 6). Most of the Park -abode parcel was paved. Vegetation had begun to re -colonize the southern end of the property, and was dominated by Himalayan blackberry, black cottonwood seedlings, and reed canarygrass. 3.3 S01LS Most of the Pori Qu.rendall and Baxte= parcels are mapped by the King County Area Soil Survey (197a) as Bellingham silt loam, a poorly drained soil that is listed as hydric. The northern portion of the Baxter parcel is listed as Seattle muck, a very poorly drained organic soil that is listed as hydric. Most of the Barbee i1vlill parcel is mapped as Nooksack silt loam, a well -drained soil that is not listed as hydric. Much of the property had beech inundated by Lake Washington prior to the artificial lowering of the Lake by about 8 feet in 1916. All of these native soils, however, have been severely disturbed by past industrial operations and largely buried under three to 13 feet of old fill material (CH2M Hill, 1978). Aerial photos show that the entire subject property etas gradually cleared, graded, and filled between about 1936 and 1974_ h, ldoc-arealnalreslsvpdocs1caaxtcaas0015lrpr0005.doc wetland Dr-Lf lima'im Rcpors JAG Dcvclopment Property 7 During the present investigation, soils approximating the SCS descriptions were found in only a few shoreline areas on the Port Quendall parcel (Data Plots 1 and 2). These areas may have been beyond the edge of the most recent fill deposits. The remainder of the subject property was underlain to a depth of at least 18 inches by old fill materials includtna: compacted gravel (Data Plots 3, 7, 8. t2, 14, and 15), decayed concrete and asphalt (Data Plot 1 3), and loamy sand that is probably from May Creek dredge spoils (Data Plots 4, 7, 8110, and I I)_ SEIt loans and silty clay loan were found only in the east parcel (Data Plots 5 and 6). 3.4 HYDROLOGY 3.4_I Overall Site Hydrology Surface and shallow subsurface hydrology on the subject propery involves several different processes, including I) ponding over impervious surfaces and compacted fill, 2) interaction with the Lake Washington water level, 3) groundwater flowing onto the property froth the east, and 4) past excavation of ponds and ditches. Water was observed inundating much of the Port: Quendall and Baxter Mill parcels after storm even;s in 1996/1997_ In extensive areas of compacted fill, water appeared to pond above these materials rather than saturating there (Data Plots 3 and 13) or to saturate them from above to a depth of only a fc\v inches (Data Mot 12). These conditions also prevailed in the unpaved portions of the Pan -abode parcel. Several shoreline areas were saturated to the surface because of their relation to the Lake Washing- ton water level (Data Plots I and 2). Significant groundwater flows onto the subject property from the east in several locations, typically in the vicinity of the adjoining eastern railroad grades (Data Plots 7, 8, and 11). Hydrology in the eastern parcel also appears to be related to this groundwater sE�epagc (Daa Plots 4 and 6). Lastly, several on -site areas that had been artificially excavated in the past were ponded several feet deep_ Se,, oral of these had been excavatcd as ponds or lagoons during previous industrial operations, and others appeared to have been excavated more recently in order to drain the active log storage yards. The Gypsy Creek Sub -basin Drainage is a short stretch of open channel conveying stormwater flows westwwd. It is fed by a culvert that enters the subject property under a railroad grade, and discharges into a pipe that extends under the Baxter site to discharge into Lane Washington. The Barbee Ditch is an excavated drainage ditch that discharges to May Creek on the Bancce Mill Parcel. 3.4.2 Stream May Creel: flows through the Barbee Mill parcel to its mouth at Lake Washington. The on -site portion «tas realigned into its present channel between 1936 and 1946, and is now designated as a Class 1 stream by King County. The Washington State Catalog of Streams and Salmon Utilization lists this stream as South Lake Washington Drainage 40282 in Water Resource Inventory Area 408_ May Creek is known to supportstocks of coho, ehiriook, and sockeye salmon as well as resident fish species (Williams et at., 1975). h:ldoc areairralrestwpdocslcaaxtcaoxOOI Wetlind Determination Report JAC) Developmcnt Property $ 3.5 WETLAND DETERMINAI-ION Eight 'urisdictional wetlands were identified on the subject property. They wxcrc delineated bel.%VC-INI February 19 and Fcbruary 27, 1997, and were verified by the C(lrps (Wring an April 8, 1997 on -site inspection. Welland locations arc shown in Figure 2 wid characterized in Tables I and 2- Al[ on -site wetlands are in previously disturbed areas and have formed over old fil[ a e ry 3 wetlands by the I materials or in excavated areas. All would be classified s Cat go City of Renton because OICY nlCet the Cr'LtQn'a of hydrolouicalterat-lorl and soils alteration (Renton, [ 992). "fable 1: Wictland Summary Wetland (parre[ location) On -site Area in Acres (square feet) UMN'S'Ciassification City of Renton Category. Required Buffcs .(widthin'.feit) A (Q Lif it da 11) 0.195 palustrine f6TCStCd 3 25 (8,527) B (Qdendall) ............... . ............................ (),374 ........... ....................................... ..... .... palustrine forested ......... ....... ...... 3 .......... __ ....................... 25 (16,284) .............. ......... ............................................ ........... ­i....................................... C ( Uenda[]) ­­1 ....... . 0,171 ..... ­1 ..................... ................. palustrine scrub-shrubl ......... ............. ........ 11.11 3 25 . (7,444) .......... ciner�geDt/opcn water ...... .... . ...... .... .. ........... .......... . .... ............. I—- D (P3qx(C(-) ...... ­­­­ 0.030 - ....... ........ .................. palustrine --- ...................... .. ..... 3 ­­ .......... ........... (3,483) scrub-slirub x t er) 0.230 palustrine scrub s I i r i 1 .. 3 ............. ------ ........ 25 I (f 0,027) ------ enieugent/open water I ................ I .............. ................... ............. ......... F (East) ............. ­­­ - .. 0.150 ........ ­1 palustrine forested .. ........... ......................... ............................................ 25 . (6,528) 1- ............ - .................. ............... - ............. ... ' I.". ............................ .......... G (East) .......... 0.015 ...... ...... palustrine enter- ent ....... 3 .... -.--.....I.................,......-- 25 (661) ­'.­ ............ ------- I—— ....... I ............. ............ ................ H (Bnrblee) ................... 0,141 palustrine eme,-Went ........... .. 3 ............................ 25 (6,151) To m I n rex l.ib (59", 0 5 I United Statef, Fish and Wildlife Service (Cowardin c, al., 1979). Table 2- Functional Assessment Suniniary Weiland Ittax.i A B C 1) E It G ri I"lood,Istorna xvatcr control 15 7 9 9 5 1 1 9 6 .......... - ­.. . ............ I .......... ......... ... - ... ­­­ ............. Ease nov; and ground water support ........ 15 6 ......... 6 . 1.1-I.I.-.- 9 ...- .. ..... 9 I-- .......... ? .... .... .. 7 .......-- 7 ...... .... .... ......... ­"..'.'­'­ ............. - ----- ­.­ .............. Erosion/shoreline protection ........ 9 ....... 1- .... 1. 5 ­­ ................. 5 ....... NA ­­­­... . NA .......... I . ... 6 .......... . NA ........... . NA ........ NA ........ I . .. . ........... I.- ...... ­­­ ........... .......... ..... ....... I ......... \Vaier quality improvement ............. I ....... NIA .. 11-1 ........ NIA ... N/A ........... N/A .... I N/A . ............. I NIA .. ...... ...... N,A .... ........... ­_­ .... ­­­ N/A ....... . N!A ....... ___ .......... ......... ­­ ... ­'­­­ ....... I ....... ­­ ....... ­­ ... ... ..... ... Natural biological Z' ical support ............ ...... ­­­­ ....... 36 . ............... 19 ........... . ...... ­­...- 23 .... ......... .. 1 18 ........ ­­' . ............. .. 15 .... ­­­.- ....... ... 72 .11- — 15 .......1 . - 13 16 ........... ........................... Overall habitat function 9 3 4 3 3 4 3 . 3 ........ .............. ........................ Specific- habitat functions ............. .. 11 ... 15 ... . ......... 6 ............... 7 8 .............. 6 ....................... 6 .......... ......... - 6 .......... ..... 5 .. 5 ........... _­­­ ........ ......... . ........................ I .......... Cultural/socioi�cononisc [unction ............... ..... 21 .. __ ....... 6 ................ 6 ............... 7 ....... 17 7 7 7 7 Overall Function Points 12l 52 58 54 49 ±Etftal 57 41 44 45 I Maxinium possible score for this function. jj, 5 V1110005.doc \VL113tid D,.nermiwaior. Report JAG ]4velopnienr Property 9 Wetlands A and B are located along the lakeshore. Although they have been altered in the past, as evidenced by the immature forested vegetation, they appear to occupy gaps between the Lake Washington shore and the grain on -site fill deposits that cover the rest of the property. Wetland A (Data Plot 1) is entirely forested by iinma€ure red alder with an understory of Himalayan blackberry. Hydrophytic species including yellow -flag iris, reed canarygrass, and creeping buttercup occupy the hcrb laver_ Wetland f: (Data Plot 2) includes areas of red alder forest as well as scrub -shrub areas dom na€ed by laardhack and Pacific Nv'llow. Wetland C is a remnant of an old industrial lagoon on the Quendall Parcel. It is primarily open water, but it also supports emergent vegetation dominated by common cattail and young black cottonwood saplings overlianging the water. Wetland D is centered on an old industrial settling pond and Wetland E encompasses "Baxter Cove" (Figure 2). Both include artificial excavations, but were determined to be wetlands because vigorous communities of hydrophytic vegetation have developed. Both wetlands contain dense growth of coriarnon cattail- Wetland D also includes a shrub layer of Pacific Willow and red -osier dogwood (Corpus stolonifera). Wetland E contains an open -water component and a shrub layer of Himalayan blackberry, red -osier dogwood, and red alder saplings - Wetlands F and G are located in the small eastern parcel of the property. Wetland F (Data Plot 4) is forested by red alder, black cottonwood, and Pacific willow, with a dense understory of Japanese knotweed (Polygonzan cuspidatum) and i-limalayan blackberry. Wetland G (Data Plot 6) is largely a monotypic patch of reed canarygrass, with shrub coverage of red -osier dogwood and Himalayan blackberry around the margins. Wetland 14 is located near the Barbee Mill entrance and is represented by Plot 11. Although a sntall group of red alder trees overhangs part of the wetland, it is essentially an emergent wetland that is maintained as a mown lawn- Dominant species include bentgrass (Agroslis srOl(Miferca), red fescue (Fesluca rubru), and reed canarygrass. 3,6 '"'E.TLAND FUNCTIONS The on -site vvetlarrds �,erc evaluated for eight functions: flood/storm water control, base flow and as'ouaad water support, erosionlshorelinc protection, water quality improvement, natural biological support, ovcrall habitai functions; specific habitat functions, and cultural/socioeconomic functions. F=urictional assessment for cacti wctland is summarized in Table 2. The scores indicated are relative to i maxin7ura3 potential number of "points" ender this method. Tlicy can be compared with the numbers in -max." column to determine functions that have very low point scores and may thus be potentially lacking. For functions that are present. point scores can be compared to nuak on -site wetland functions. Evaluation fornns for each wetland identify the characteristics that influence the assessment, and are included in Appendix E. Pot most functions, on -site wetlands varied only slightly. This is expected, because all on -site wetlands have been altered and disturbed by industrial activities, and have developed over artificial fill deposits_ Wetland 1 is of relatively high value for flood/storm water control because it lies in a closed depression .vith a constrained outlet- However, this function is lacking in Wetland E h: Woe -area lrialreAivpdocz tcam1 coas00151rpl0005.doc wetland Determination Report JAG Dc,/ciopincnL Property 10 because it is open to the fake Washington shoreline, Wetlands C and E are the highest value on - site vxlhuzds for "base flow and ground water support", because they are permanently flooded depressions. I Iowevcr, there is relatively low potential for this function on the property because of its location at the lower end of its drainage basin_ Wetlands A, B, and E are the only on -site wetlands with potential value for "erosionlshorelinc protection" due to their locations on the shoreline of fake Washington. Based on available information, there is little potential for "water quality improvement" functions in any on -site wetland due to soil contamination froth past rises of the site. Wetlands B and E are the highest value on -site wetlands for "natural biological support." Both of these wetlands have low proportions of invasive plant species. In addition, Wettand B has relatively high levels of "vegetation structure" and potential "organic accumulation," and Wetland E includes three classes of wetland including open water. All on -site wetlands are lacking in "overall habitat function" because they aze small, with low habitat diversity and narrow to non- existent buffers that leave them open to disturbance_ Wetland C is the highest value on -site wet- land for "specific habitat functions." It includes moderate levels of potential invertebrate and amphibian habitat due to its shallow inundated emergent area, and observation of nesting Canada geese was evidence of bird habitat value. All on -site wetlands have low potential value for cul- tural and socioeconomic uses according to this assessment niethod, because they are privately owned with access limited by pollutant hazards and ongoing industrial activity, lack commercial resources such as fish populations, are not notable for aesthetic appearance, and lack recreational and educational opportunities. Overall, all wetlands are of relatively low quality. None attain even half of the maximum points available. 4. REGULATORY IMPLICATIONS 4.1 V,"F:'I'L,,kN1)S Several federal, state and local regulations apply to development proposals in and near wetlands. Agencies having jurisdiction over development activities that affect wetlands may include, but may not be limited to, the City of Renton, the Washington State Department of Ecology (WDOE), Washingmn State Department of Dish and Wildlife (WD1= W), and the U.S. Army Corps of Engi deers (Cot-ps). The City of Renton has guidelines for development in and near wetlands and for mitigation for permitted L-ctlarid impacts resulting from development. The WDOE has review and approval authority for many Federal, State:, and local permits. In addition, the WDFW administers the State Mvdraulic. Code, which is intended to protect fish life and its supporting habitat. The Corps regulates the discharge of fill material into jurisdictional wetlands_ This determination report conducted by DEA is subject to verification and approval by these agencies. Detailed site design prior to verification by agencies is not advised. PUrsttant to the, Clean Water Act, and through the Section 404 permitting process, the Corps has been given the responsibility and authority to regulate the discharge of dredged and fill materials into waters of the United States including wetlands. Currently, Nationwide Permit 26 under Sec lion 404 allows filling less than 0.33 acres of wetlands that are not within 100 feet of a stream having a channel over two feet wide. When filling such wetlands, the Corps must be notified within Ir: ldocarealrrptreslwpdocsieanxicaaxll0! Slrpt0045.dac «'ctland Dctermirr<ttion ltcI)ort JAG Oe ve.loPrncni Prober(} t 1 30 days after construction. Under Washington State regional conditions, fills between 0.33 acres and 2.0 acres, located over 100 feet from any stream channel over two feet wide, Enay be filled subject to a `pre -construction notification" involving submission of a site plan and wetland ;nitiga- tiora plan. Any wetland fills totaling more than two acres, or any filling of wetlands within 100 feet of a streain channel over two feet wide, requires an individual permit_ The individual permit proc- ess requires a full project alternatives analysis, and the project is typically modified to reduce im- pact_ For all wetland filling totaling one acre or more, a separate water quality certification is required by the WDOE✓ The State Environmental Protection Act (SEPA) is implemented by local agencies and provides a process to analyze the environmental impacts of development. During SEPA environmental re- view, various agencies have the opportunity to review and comnient on proposal. The City of Ren- ton will act as the lead SEPA agency for this project. City of Renton regulations define development parameters in and around wetlands, streams, steep slopes, shorelines, and other sensitive areas_ The City reviews all development proposals and im- plements the appropriate restrictions outlined in the regulations. The on -site wetlands fall within the City classifications and require buffers as shown in Table 2. Renton regulations allow for fill- ing of some wvetlands, but requires mitigation in the form of wetland creation or enhancement. 4.2 STREAMS May Creek is a Class 1 stream requiring a 100-foot buffer (50 feet along each hank) in the City of Renton. lviay Creek is also considered a "shoreline of the state" and falls within the Washington Shorelines Management Act. It: Idoc-arcs 4narresl tiq)docs 4caax4caazfl0l Welland Determination Repoa 5AG Development Properly 12 S- REFERENCES Adurnus, Paul R., E.J. Clarian Jr., D.R. Smith, R.C. Young, and ARA Inc,, 1957. Washington, D.C., U.S. Army Corps of Engineers Environmental Laboratory. CH2�1 Bill, 1978, Prelirninary Geotechnical Investigation, Port Uriendall Development, Renton, l,1Jashington. Project S 12212.110. Memorandum to Mr_ Jeff Layton dated December 20, 1978. Cowardin, L.M., V. Carter, I;-C. Golet, and L.T. LaRoe, 1979. Classification. of Wetlands and Deepwatcr Habitats of the United States. Office of Biological Services, Fish and Wildlife Service, U-S. Dept. of the Interior, FWS/013S-79131. David Evans and Associates (DEA), 1995. Wetland Reconnaissance on the JAG Development Property. Project CAAXOOIS. Men-iorandurn to Mr. Jim Spitze dated November 4, 1996_ Bellevue, Wa_shington- 1 nvirorunental Laboratory, 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1, U.S. Arrny Engineer Waterways Experiment Station, Vicksburg, MissisSlppi. I litchcock, C.L., and A. Cronquist, 1973. Dora of the Pacific Northwest. University of Washington Press, Seattle, Washington. King County, 1990, King County Sensitive Areas Map Folio Reed, P,B- Jr., 1988. National List of Plant Species That Occur iD Wetlands: 1988 Northwest (Region 9). Biological report 88 (26.9), U.S. Fish and Wildlife Service, Inland Freshwater L-cology Section, St. Petersburg, Florida. pp. 86. Reppert, Richard 'I'_, Wayne Siglco, Eugene Stakhty, Larry Messman, and Caldwell Myers, 1979. Wetland Values - Concepts and .'Methods fnr Wetlands Evaluation. Fort Beivoir, Virginia: U,S_ Army Corps of Engineers Water Resources lnstitute. Terra Associates, 1993. T,I etland Delineation .Report for The Baxter Mill Property. Seattle, Washin"ton. ThoI]las Brothers, 1995. The Thomas Guide - Kink. Picrcc, and Snohomish Counties Street Guidc and Directory. U.S-D.A. Soil Conservation Service, 1973. Soil Survey King County Area, Washington, D,C., U-S. Government Printing Office, U.S.D.I. Fish and Wildlife Service, 1987. National Wetlands Inventory Denton Quadrangle. U.S_G.S, 1950. Denton Quadrangle Mal). kIdoc-orealtzalr,7stxpdoestieaax)coaxOOI51rpt0005.doe Wetland Determination IZcport JAG Development Property 13 Williams, RW, R.M. Laramic, and JT Ames 1975. A Catalog of ITrashinglon Streams and Salmon Utilization - Volunie 1, Puget Sound. Washington Department of Fisheries, h: ldoe-areaUratresl xdoesSeaasleaax0@J 5 Wetland Dctcrinination Rcport JAG Dcvcloprncnt Ptopcny 14 4EMASSOCIATED EARTH SCIENCES, INC WETLAND E GYPSY SUBBASIN D 4 �0 Qa WETLAND - D GE NORTH J.H. BAXTER r Q UENDALL TERMINALS " REMEDIATION ACTIVITY AND WETLANDS AND SHORELINE VEGETATION SOUTH J.H. BAXTER PARCEL REMEDIATION FOOTPRINT RENTUN, WASHINGTON LEGEND v'A~ Area of remediation impact along the shoreline _1 Less than 50% wood waste (no action, capping, partial capping, partial dredge, or complete dredge; to be determined) - 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 with redevelopment Excavated to required depth to remove contaminants or sludge; in situ stabilized to 18' below ground surface or replaced with clean material to capped grade (See Note 2) .�.- Blackberry Shrubs Trees NOTE: 1. ALL HABITAT, VVETLAND, AND PROJECT FEATURE LOCATIONS AND QUANTITIES ARE APPROXIMATE. 2. SEE FINAL CLEANUP ACTION PLAN FOR ACCURATE CLEANUP DETAILS. '44� NORTH 0 Vc 200 U 400 APPROXIMATE SCALE IN FEET FIGURE 1 DATE 4/5100 PROJ. NO KB99142B MITIGATION ANALYSIS MEMORANDUM OV NDALL AND BAXTER PROPERTIES CORPORATE OFFICE 91 1 Fifth Avenue, Suite 100 Kirkland, Washington 98033 14251 827-7701 FAX (425) 827.3424 MNBRDGE ISLAND OFFICE 179 Modrone Lane North Boinkridge Isfond, WA 981 t0 ;2M6 780-9370 FAX {2061 780-9A38 RENTON, WASHINGTON PREPARED FOR Vulcan Northwest City of Renton PROJECT NO. KB99142A February 17, 2000 ASSOCIATE© EARTH SCIENCES, INC 40 Associated Earth Sciences., Inc. A m Addendum to the QuendalI and Baxter Properties Mitigation Analysis Memorandu.ii Dated February 17, 2000 J.H. BAXTER-PROPERTY NUTIGATION ANALYSIS MEMORANDUM' Renton, Washington Prepared for Vulcan Northwest Project No, KB99142B March 31, 2000 Geotechnical Engineering Water Resources J` STi "1W Solid and Hazardous Waste Ecological/Biological Sciences GeologicAsse5sments- 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 110 110' 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 March 31, 2000 Project No. KB99142B An Addendum to the Quendall and Barter Properties J'.H. Baxter Property Mitigation Mitigation Analysis Memorandum Analysis Memorandum Dated February 17, 2000 TABLE OF CONTENTS Pace 1.0 INTRODUCTION ......... . ................ ............................................................ I 2.0 REMEDIATION IMPACTS TO THE BAXTER NORTH 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- .. 1. 1 1 1 1. 1. 1 1 1 ...... I ... I .......................................... ­1111,115 LIST OF FIGLTRES Figure 1. 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 March 31, 2000 ASSOCIATED EARTH SCIENCES. INC. ACK11d - KB9914284 - LD-D: u 413-00 - W2K Page i An Addendum to the Quendall and Baxter Properties J.H. Baxter Property Mitigation Mitigation Analysis Memorandum Artatysa Memorandum Dated February 17, 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 the Quendall Terminals and Baxter South Parcel properties, without specifically separating the 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 that 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 Quendall and Baxter Properties (AESI 2000). ' Associated Earth Sciences, Inc. (AESI), 2000, Miti ation Analysis Memorandum uendall and Baxter Pr`penies. Prepared For Vulcan Northwest and the City of Renton, dated February 17, 2000. March 31, 2000 ASSOCIATED EARTH SCIENCE'S, INC. A Wid - K84914284 - 1D-D: i&U-00 • W1,t Page 1 An Addendum to the Quendall and Baxter Properties .I.H. Baxter Property Mitigation Mitigation Analysis Memorandum Analvsis Memorandum Dated FebTgm 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. Consequently, 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 1. 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, AESI 2000). 3.2 Dredge Offshore Polycyclic Aromatic Hydrocarbons (PAH) Wetland E (Baxter Cove) will be dredged to remove polycychc 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 habitat will be eliminated. 3.3 In -Water 50 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: (1) 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. March 31, 2000 ASSOCIATED EARTH SCIENCES, INC. ACKAd . K999t4i$4 • LD.D: ud13•00 - w1A Page 2 An Addendum to the Quendall and Baxter Properties J.H. Baxter Property Mitigation Mitigation Analysis Memorandum Analysis Memorandum Dated February I7, 2000 3.4 Upland Soil Rernediation 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 1). 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 laws 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 laws 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 1:1.5 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. March 31, 2000 RSSOCrA7TD EARTH SCIENCES, INC. AMid - xa99142H4 . LD.D: UdU-0n - wzx Page 3 An Addendum to the Quendall and Baxter Properties J. H. Baxter Properry Mitigation Mitigation Analysis Memorandum Analysis Memorandum Dated February 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 at 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 .Tune 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. March 31, 2000 Ass0C1A7'ED EARTH SCIENCES, INC. ACKAd - KB44142B4 • t.D-D:1012.00 • WZK Page 4 An Addendum to the Quendall and Baxrer Properties J.H. Baxter Property Mitigation Mitigation Analysis Memorandum Analysis Memorandum Dated February 17, 2000 4.4 Water Quality 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 rernediation activities could occur without proper temporary erosion and sediment control (TESC) measures. A synopsis of likely TESL 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 AESI 2000). 4.6 Monitoring and Contingency Post -construction performance standards, a 10-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 AESI 2000). 4.7 Mitigation Assurance The Consent Decree for the Baxter South Parcel would provide assurance that the mitigation proposed in 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. March 31, 20W ASSOCIATED EARTH SCIENCES. INC. A Mid- xe99+429e . tD•a: UdV-06 . wzx Page 5 � ti it 1 a 100 20a TING F rl LINE ; BAR REVISED LOT #15 5 r ' { r , -IDPOPO�EDI 1 iJE W PARCEL LINE '. BAXTER SOUTH PARCE0, 1 °C /1/ 1: { if *' fo ti 50' AVERAGE BUFFER ' c� oo 4 t 1 i o r= Qa °^ 00 0.46A 1� o ° APPROO-vIATE AREA OF � o o M9TiGATIOV WETLAND �Q � •I � Fj'rr m rn BAXTER SOUTH PARCEL MITIGATION FIQURt e EARTHIATEQ SOUTH BAXTER PARCEL � AMSCIENCES. Ir,c RENTON, WASHINGTON v LAND USE & SHORELINE PERMIT APPLICATION The Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA ORIGINAL Prepared by Crawford Architects and The RETEC Group for Football Northwest LLC 24 May 2006 The Baxter Site Development Plan New Seattle Seahawks Practice Facility Renton, WA TABLE OF CONTENTS Section 1 Master Application • Application Form • Affidavit of Ownership • Port Quendall Company — Consent of Directors • Waiver of Submittal Requirements File • Vicinity Map - Zoning Plan • Site Plan Illustrating Existing Conditions and Topography Section 2 Project Narrative • Location Page 1 • Access Page 1 • Utilities Page 2 • Project Components Page 2 • Proposed Uses Page 2 • Facility Features and Description Page 3 • Civil and Site Description Page 4 • Public Access to Shoreline Page 6 • Construction Page 6 Section 3 Environmental Checklist Section 4 Partial Certificate of the Completion for the Capital Portion of the Cleanup at the JH Baxter South Parcel Section 5 Site Plan • Conceptual Site Plan (Preliminary) • Conceptual Grading Plan (Preliminary) • Conceptual Utility Plan (Preliminary) Section 6 Preliminary Storm Water Technical Information Section 7 Wetland Mitigation Plan and Map • Site Plan • Wetland Determination Report — May 1997 • JH Baxter Property Mitigation Analysis Memorandum — 31 May 2000 Table of Contents 24 May 2006 LAND USE, SHORELINE & MASTER PLAN PERMIT APPLICATION North & South Baxter Site Development Plan New Seattle Seahawks Headquarters & Training Facility Renton, WA ADDENDUM 1 Prepared by Crawford Architects & the RETEC Group for Football Northwest LLC 24 May 2006 Revised 6 September 2006 Addendum 1 27 September 2006 27 September 2006 MEMORANDUM TO: Ms. Elizabeth Kggins City of Renton FROM: David Murphy Project: Seahawks Practice Facility Subject: Addendum 1 — Land Use, Shoreline & Master Plan Permit Application Copies to: Ray Colliver, Elaine Wine, Filer The following addendum to the Land Use, Shoreline & Master Plan Permit Application for the North and South Baxter Site Development Plan — New Seattle Seahawks Headquarters and Training Facility is provided for your review. Addendum 1 dated 27 September 2006 — Visual Assessment (Section 11) Please contact Elaine Wine at Vulcan or myself if you have any questions and additional requirements. End of Memorandum Page 1 MEMORANDUM 27 September 2006 Crawford Architects 1901 Main Street — Suite 200 Kansas City, MO 64108 816 421 2640 telephone 816 421 2650 facsimile North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA VISUALIZATION ASSESSMENT 1.00 INTRODUCTION A. Process Over seventy (70) views have been photographed and evaluated. Of these, eleven (11) potential view corridors to the lake and shoreline at the Baxter Site have been evaluated in further detail including: 1. Nine (9) views from residential units from the Misty Cove site_ 2. Two (2) views from land areas east of Interstate 405. a. View from SE 76th Street b. View from the "Kiewit Building" (non-residential) Of these views, three views have been deemed to be "worst -case" when overlaid with proposed development and represent a range of views of the lake and shoreline_ They are summarized in this draft report and include: 1. View from SE 76" Street 2. Unit 312 Misty Cove 3. Unit 302 Misty Cove The views from lower units of the Misty Cove Condominiums are currently impaired by existing structures, vegetation and fencing_ Views from residences to the south and north of SE76th Street are also affected by existing mature trees and vegetation. Figures 1 and 2 illustrate the location of these views in plan and elevation. Figures 3 through 8 illustrate proposed development with comparisons to existing conditions from the same station point/ camera location. In all proposed views, vegetation is simulated at anticipated full maturity and height. Representations of building heights represent required height for the proposed indoor practice facility. Architectural representations of fenestration, materials and color palettes are preliminary and subject to change as the design proceeds in greater detail. 2.00 FINDINGS In all of the view analyses, views to the site will be impacted since a new facility is being constructed on a vacant lot. In general, existing views of the lake and shoreline area are not impacted from occupied structures and/or properties surveyed to date. Specific findings for designated "worst -case" views follow. A. View 1 - from SE 761h Street looking west toward the Project Site (Figures 3 and 4): Existing view of the lake and shoreline is not adversely impacted B. View 2 — Unit 312 Misty Cove (Figures 5 and 6): Existing view of the lake and shoreline is not adversely impacted C. View 3 - Unit 302 Misty Cove (Figures 7 and 8): Existing view of the lake and shoreline is not adversely impacted. Visualization Assessment 24 May 2006 Revised 6 September 2006 Page 1 North and South Baxter Site Development Plan New Seattle Seahawks Headquarters Renton, WA 3.O0 ON GOING ANALYSIS Analysis will be on going as the design proceeds. Visualization Assessment 24 May 2006 Revised 6 September 2006 Page 2 IA FIGURE I G 1 '-7 fl FIGURE 2 Al 4 T s 'Y 15 U AL I Z A T I ON 4 S ` F 5 ; FJ F N T VAl 00 1 m 1 !. F. f M NOIE)NIHSVM'NOlN3d 01-1 1S3MH-WON IIVBIOO� Al!l!oej Bululej-L vp sja:penbPBGH slmeqeOS C) I 1> co LU LL