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A",c-,J O u VN,4 Preconstruction Meeting Minutes C iTq o r O EN-m t.1 Contract 6145 August 29, 2001 RECEIVED SEP 0 5 2001 Preconstruction Meeting Minutes CITY OF RENTON SR 405 — SR 167 UC Modification UTILITY SYSTEMS Contract 6145 Meeting began at 10:00 AM. Introductions of all attendees (list of attendees attached) Ingo Goller began the meeting by stating that this project has attracted a large amount of interest and that attention be taken to ensure issues regarding water quality and safety of the workers and traveling public be addressed and resolved. Ingo stated that all letters be sequentially numbered for reference. He asked who the contact person for Max J. Kuney would be for correspondence. Kevin Carroll will be the contact. Ingo stated that there are many utilities within the project limits that may come in conflict with construction. A list of utility companies with known facilities is listed in the special provisions. A preliminary contract schedule was previously submitted by Max J. Kuney for review. Bill McKee stated that he had reviewed the schedule and there are some errors in it. Kevin Carroll stated that he is correcting the errors based on phone conversations with Bill. Bill gave Kevin his written review comments for use. Job Site Posters were given to Max J. Kuney. Ingo stated that it is critical to submit material documentation to ensure prompt payments. He encouraged Max J. Kuney to work with Nancy Guinn to verify that the documentation is correct. Ingo stated that the estimate cutoff will be the 5"'of each month. The Material on Hand requests cutoff will be the 20'of each month. Ingo mentioned that Material on Hand payments can be made for individual materials with a value of at least $2,000.00 and all documentation is in place. Ingo asked who would review pay estimates. Kevin Carroll stated that he would review them. Ingo asked that all lump sum item breakdowns be submitted to this office. Preconstruction Meeting Minutes Contract 6145 August 29, 2001 Ingo stated that the Request to Sublet and Intent to Pay Prevailing Wage forms are required to be submitted before working on the project. The contractor representatives to be on site will be Duane Shepard and Tom Price. Ingo stated that this job has a total training requirement of 2000 hours. The DBE goal for this contract is 14% of the contract total Ingo asked if Max J. Kuney would like to hold weekly meetings. Duane Shepard stated that he would like meetings to be held on Wednesday mornings at the jobsite (time to be determined). Erosion Control Lead is yet to be determined. The TESC and Spill Plans have previously been submitted to WSDOT for review. A discussion ensued regarding the timing for the wetland mitigation work. Joanne Wright (WSDOT NWR Landscape Design) asked if Max J. Kuney had a firm date of when the work would begin. Allen Quinn (City of Renton) also wanted to know this information and asked if the mitigation work is part of this contract or a separate contract. It was stated by Bill McKee that the work is part of this contract. Kevin Carroll stated that he has not set an actual date. Karsten Olson asked if there was a better time to do this work Both the City of Renton and Joanne Wright stated that this fall is a good time. Joanne stated that now is the time for effective weed control. Ingo stated that WSDOT has taken care of the necessary permitting for the project,but if any other permits are required, the Contractor will be responsible to obtain them. Bill McKee stated that any traffic control plans that are to be used on city streets will require review by the City of Renton. Requests for contract plan or specification clarification will require five days for review and an advance notification of three days will be required for survey requests. Ingo asked if the Traffic Control Manager and Traffic Control Supervisor have been designated. Penny Nicksic (Max J. Kuney) will be the Traffic Control Manager for the project and there will be two Traffic Control Supervisors designated to the project (names to be determined). A letter will be submitted for record. An emergency contact list with a minimum of four contacts will need to be submitted by Max J. Kuney and WSDOT will send a list of their contacts to Max J. Kuney. Ingo stated that this contract requires a safety zone of 9 meters and that all personal vehicles in the work zone will need to have amber lights to designate them as construction vehicles. Any person who is not directly associated with the contract will need to contact Ingo's office to be escorted to the jobsite. Ingo made all aware that anyone who is not authorized will be asked to leave. Preconstruction Meeting Minutes Contract 6145 August 29, 2001 Ingo stated that any modifications to the Traffic Control Plans as shown in the plans will require submission for review and approval prior to implementation. Ingo stated that if Max J. Kuney will be using the traffic control as shown in the plans, a letter adopting our plans will need to be submitted. Current flagging cards will be required for the jobsite flaggers and traffic control laborers. Ingo stated that recently there have been a number of vehicle encroachments into work zones and that there was a shooting incident where a worker was hit with a pellet. It was stressed that the motoring public is less tolerant if they are slowed by lane closures and that all workers be alert and make sure all work activities are done in a safe manner. General Discussion : Joe Armstrong (City of Renton) stated that the city has a project to construct wheelchair ramps at the sidewalks at Rainier Ave and Grady Way. Bill McKee stated that this should not directly affect our construction, but we will take this into consideration for traffic control setups. Ingo stated that there will be a groundbreaking ceremony for this project on September 20, 2001. Invitations will be sent to Max J. Kuney. Bill McKee asked Max J. Kuney for a list of Contractor and all Subcontractor field superintendents. These individuals will be recognized at the ceremony. A website will be developed for this project so the public can follow the progress and get a better understanding of the project. Ingo proposed an offer to Max J. Kuney to review the project to determine a plan to accelerate work to complete the project in less than the 300 days. Karsten Olson will review the plan and provide a proposal to Ingo. Bill McKee stated that there are two issues which are known to be change orders at this time. A bid item will be added to the contract for"Rock Excavation Incl. Haul' and a specification will be added for silicone grease for the pin bearing bolts. Cathy Arnold asked when physical work on the project would begin. Kevin Carroll stated that he is anticipating the work to begin in approximately two weeks (September 10, 2001). He is waiting on approvals for the TES and Spill Prevention plans and materials to be used for erosion control. Preconstruction Meeting Minutes Contract 6145 August 29, 2001 Bill McKee gave Max J. Kuney plan clarifications for Wall 4 alignment and Class A signing for the wetland mitigation site. Cathy Arnold asked for a copy of any proposals for project acceleration when Ingo receives one. Alan Quinn requested that a copy of the schedule for the wetland mitigation work be sent to him. Meeting concluded at 10:45 AM. Contract 6145 Pre-construction Conference August 29, 2001 Name Organization Phone Minutes Copy T x Za 1 S� - -0 L n 1., z o ye 5 rr� W50C>T-- 1,1026eqlm S06~YVO- 4177 1_101� N - I rm lcz S C Lj&ut5 w 5 0 lJ5LOT Z53 - SI<�-a95S 0 e ,-n Pn Ci o-�1 ohs C¢z� �3�., ?3c�3 G .5 an Cf d �fLs' - 3t3- 715� 1 r J ,wa�� 03 —?Z3 Washington State Northwest Region Department of Transportation 15700 Dayton Avenue North P.O.Box 330310 Sid Morrison Seattle,WA 98133-9710 Secretary of Transportation (206)440-4000 March 26, 2001 RECEIVED Tom Gibbons LIAR 2 8 2001 National Marine Fisheries Service CITY"OF RENTON 510 Desmond Drive SE, Ste. 103 UTILITY SYSTEMS Lacey, WA 98503 Re: Addendum to SR 405, SR 167 Interchange Biological Assessment: Addressing Riparian Mitigation Dear Mr. Gibbons: As discussed in the SR 405: SR 167 Interchange Modification Biological Assessment, the Washington State Department of Transportation (WSDOT) is proposing to improve safety features and reduce traffic congestion for State Route (SR)405 southbound collector distributor traffic merging with traffic from SR 167, in the City of Renton, King County, Washington. The project will construct a flyover structure from the existing southbound I-405 off-ramp to the southbound SR 167 on-ramp, and will modify the existing southbound SR 405-to-northbound SR 167 ramp to accommodate future widening of SR 405 for direct transit access projects. This project will create an additional 3052 m2 (10013.1 ft2) of impervious surface. Stormwater from 7062 m2 (23169.3 ft2), or 231 percent of the new impervious surface area, will be treated and detained. A Dry Pond, biofiltration swales, and vegetative filter strip are the stormwater treatment BMPs selected for this project. Additionally, thirteen poplar and black cottonwood trees will be removed from the vicinity of Rolling Hills Creek in the northeast interchange quadrant to facilitate the flyover ramp. Fill material and road surfaces have raised the ground surface well above the surrounding topography, and has interrupted the natural functions of Rolling Hills Creek. There are no known comprehensive examinations for fish presence in Rolling Hills Creek, and no protected species are assumed present. Rolling Hills Creek enters the project site from the east and flows through a straight channel with banks cut at approximately a vertical slope. The stream passes under the interchange through a 1.2 m (48 in) concrete culvert approximately 460 m (-1500 ft) to the Panther Creek wetland, the P-9 drainage channel, and to Springbrook Creek. Springbrook Creek is known to support Puget Sound ESU chinook salmon. Within the project vicinity, Rolling Hills Creek is a DNR Type 3 water. The stream is highly channelized with no Large Woody Debris (LWD), rocks, or other obstructions to flow. The substrate is primarily gravel with minor components of larger cobbles. National Marine Fisheries Service (NMFS) Habitat Pathways within Rolling Hills Creek are At Risk, or Not Properly Functioning. The riparian zone in the project vicinity is limited, and vegetated with Himalayan blackberry, reed canarygrass, soft rush, black cottonwood and poplar trees, some shrubs, and grasses. Approximately 280 in (3000 ft2) of riparian vegetation, including the thirteen poplar and black cottonwood trees, will be eliminated to accommodate the flyover ramp. Following discussions with you on site, it is agreed that there is insufficient area to accommodate mitigative riparian planting for Rolling Hills Creek in the project vicinity or anywhere in the WSDOT right of way downgradient to Springbrook Creek. Accordingly, WSDOT opened negotiations with the City of Renton to explore a partnership in riparian mitigation efforts within the Springbrook Creek basin. The City of Renton has invited WSDOT to undertake riparian zone rehabilitation to improve the Springbrook Creek corridor in an area adjacent to the Metro Sewer Treatment Plant (Figure 1). Springbrook Riparian Zone Rehabilitation WSDOT has approached the City of Renton to partner in the rehabilitation of City property along west side of Springbrook Creek, next to the King County Metro Treatment Plant located north of Grady Way (Figure 1, 2). This agreement will be finalized with the City subsequent to NMFS concurrence with the SR 405: SR 167 Interchange Modification Biological Assessment. This proposal has been put together in cooperation with the City Planning/Building/Public Works Department, and implementation will require approval by the City Council. The City has stipulated that: 1. The proposal cannot interfere with current use of the site, which consists of a trail and the channel that was constructed for flood control and habitat benefits. This includes the ability to maintain the trail or the channel, if needed in the future. 2. WSDOT is responsible for the maintenance, monitoring and success of the mitigation project. 3. The City will only be responsible for notifying WSDOT of any land use changes to the site, not adjacent properties. In the event that the proposed site is not approved by the Renton City Council, an alternative site of comparable area along Springbrook Creek will be investigated and proposed. Upon approval by the City Council, the site will be surveyed and the GPS coordinates will be provided to NMFS. Project Goals The proposed rehabilitation site is lacking in endemic riparian vegetation, and invasive reed canarygrass and Himalayan blackberry leave the stream open to solar radiation and piscivorous birds. This project will incorporate features to create a natural riparian habitat. Habitat improvements will include the removal of existing invasive plants and the installation of endemic species. Proposed Restoration • Remove existing invasive plant species. • The space available to rehabilitation is limited to an approximately 9.0 m (30 ft) buffer between Springbrook Creek and the Metro Sewage Plant (Figure 2). • The total area to be rehabilitated will be approximately 560 m2 (6000 ft2). • Plantings will include a combination of shrubs, coniferous and deciduous trees in random clusters. The City of Renton has title to the riparian area to be restored and the adjacent stream reach. Final design of each of these proposed restorations will be subject to approval by the City of Renton. Conclusions This proposed habitat restoration project guarantees the restoration of 560m2 (6000 ft2) of Springbrook Creek riparian habitat as a 2:1 mitigation ratio for the removal of poplar and black cottonwood trees from the Rolling Hills Creek vicinity. The commitment by WSDOT to mitigate the riparian impacts associated with the interchange project is in perpetuity. The restoration project will be implemented as a project by WSDOT. In the event that an agreement can't be reached with the City of Renton, WSDOT will reinitiate consultation with NMFS. Conservation measures regarding maintenance and monitoring of the riparian planting area will also be implemented (Appendix A). This proposal fulfills our mitigation obligations under the Endangered Species Act for impacts arising from the proposed SR 167 flyover ramp construction. For questions or additional information on this project, please contact Brian Bigler at 206-440-4951. Sincerely, Gary Davis Assistant Environmental Program Manager/Biology cc: Kim Henry, WSDOT John Johnson, WSDOT Ron Straka, City of Renton I YY. \ Xw— Mitigation Site - we t �3�3 24 1, beta* ■_�_ sr Project Site \ ` ` + � �• ` �' -'�'- ��� ' � � 1 - tit � .. 46 -iE r� fi 2 '`..--'�—�- -*" ''�'S`�''`�,�` +1 + — •;•: — ANf r I i..ie D itpoQsdt Capptidu t�1e99 Drl.ormr\'a�mowh:�P7096 Sower Dtm�:USGS ��742 ft Stab:1:25W DoUk 13.0 D+ai—'ArG.%J - Figure 1. Springbrook Creek riparian zone mitigation. r, d l A c 0' 1100M 0' '100yd Figure 2. Proposed mitigation site along west side of Springbrook Creek next to the King County Metro Treatment Plant located north of Grady Way. The specific location will be determined by WSDOT Landscape Services. Appendix A. SR 167/SR 405 Interchange Modification Conservation Measures Planting Details The Washington State Department of Transportation (WSDOT) will perform riparian planting according to details outlined in the letter dated March 21, 2001 from Gary Davis, WSDOT,to Tom Gibbons,National Marine Fisheries Service (NMFS). Standards of Success Riparian plantings are expected to achieve certain post-planting survival levels. As a result, riparian planting will be accomplished during the dormant season. The initial riparian planting is anticipated to be completed by the end of the dormant season in 2002 (about March or early April at latest). Further, riparian plantings will be maintained two times per year in the following manner: First year after planting: 100%planted species are alive. Plant replacement has occurred if necessary. Weed species in planting areas are controlled. Second year: 80%planted species are alive. Open areas of more than six plants within planting areas will be replanted. Weed species are not dominating with desired plant species. Third and Fourth years: 70 to 80% aerial coverage is observed, including recruitment of native species. Weed species are not dominating with desired plant species. Fifth year: Aerial cover observed as mass of vegetation with diversity of plant species. Planted and recruited species dominate the site and out-compete weed species. If chemical hand spraying is used as a method of plant maintenance, it will be done when wind speed is no greater than 5 miles per hour using Rodeo and/or Roundup. As the riparian plantings are to be planted on City of Renton property, WSDOT will include in their proposal the following contract clauses with the city: • The intent of this project is to make the potential effects of the SR 167/SR 405 interchange modification project insignificant and discountable. As a result, the riparian planting project is aimed at achieving long term riparian function benefits to Endangered Species Act listed Puget Sound Chinook. • The City will immediately inform WSDOT in writing of any land use changes at the site that adversely impact the riparian plantings or riparian function at this site. If land use changes that degrade the function of the site occur, WSDOT will contact NMFS in writing regarding SR 167/SR 405 conservation measures. • If a formal agreement for riparian planting (per above) is not reached with the City of Renton by January 10, 2002, WSDOT will contact NMFS to arrange alternative planting proposals for the proposed action. Stream Monitoring for Riparian Vegetation Annual Report shall include: • Percentage live plants of each specie in planting areas. • Photo Log at consistent specified locations. • Observed weed control. • Actual location of riparian vegetation A copy of each annual report will be mailed to the NMFS Habitat Branch Chief at 510 Desmond Drive SE, Suite 103, Lacey, Washington and identified as "SR 167/SR 405 Interchange Modification Project, WSB 00-457. EXEMPTION FROM SHORELINE MANAGEMENT ACT SUBSTANTIAL DEVELOPMENT PERMIT REQUIREMENT EXEMPTION FILE NUMBER: LUA-01-072-SME APPLICANT: Washington State Department of Transportation 15700 Dayton Ave N. MS 138 PO Box 330310 Seattle, WA 98133 OWNER: City of Renton PROJECT NAME: 1-405/SR 167 Flyover Ramp Mitigation PROPOSAL: The applicant seeks a Shoreline Exemption to enhance the vegetation along a 6,000 lineal foot portion of Springbrook Creek near the Metro Wastewater Treatment Plant pursuant to the attached Memorandum of Agreement. The proposed rehabilitation site is lacking in endemic riparian vegetation and invasive Reed Canarygrass and Himalayan Blackberries leave the stream open to solar radiation and piscivorous birds. The project will incorporate features to create a natural riparian habitat. Habitat improvements will include the removal of existing invasive plants and the installation of endemic species. The Springbrook Creek bank enhancement is to mitigate for DOT'S removal of Poplar and Black Cottonwood trees from the Rolling Hills Creek vicinity in conjunction with the 1-405/SR 167 Flyover Ramp project. PROJECT LOCATION: West side of West side of Springbrook Creek between SW Grady Way and SW 7th Street. LEGAL DESCRIPTION: NA SEC-TWN-R: NE 1/4 24-23N-5E TAX ACCOUNT NO.: 2423049098 WATER BODY/WETLAND: Springbrook Creek CORPS PUBLIC NOTICE NUMBER: NA An exemption from a Shoreline Management Substantial Development Permit is hereby granted on the proposed project described on the attached form for the following reason(s): Normal maintenance or repair of existing structures or developments, including damage by accident, fire or elements. X Improvements to fish habitat or passage pursuant to RCW 90.58.147. Hazardous Substance Remediation Actions pursuant to WAC 173-27-040 (3). a:shlexemp Construction of the normal protective bulkhead common to single family residences. Emergency construction necessary to protect property from damage by the elements. Construction of a barn or similar agricultural structure on wetlands. Construction or modification of navigational aids such as channel markers and anchor buoys. Construction on wetlands by an owner, lessee, or contract purchaser of a single family residence for his own use or for the use of his family which does not exceed a height of thirty-five (35) feet above average grade level. Construction value does not exceed $2,500 and project does not materially interfere with the water or shorelines of the state. Construction of a dock, including a community dock, designed for pleasure craft only, for the private noncommercial use of the owner, lessee, or contract purchaser of single and multiple family residences. This exemption applies if either: (A) In salt waters, the fair market value of the dock does not exceed two thousand five hundred dollars; or (B) in fresh waters, the fair market value of the dock does not exceed ten thousand dollars, but if subsequent construction having fair market value exceeding two thousand five hundred dollars occurs within five years of completion of the prior construction, the subsequent construction shall be considered a substantial development for the purpose of this chapter. The proposed development is consistent or inconsistent with (check one): CONSISTENT INCONSISTENT X Policies of the Shoreline Management Act. The guidelines of the Department of Ecology where no Master Program has been finally approved or adapted by the Department. X The Master Program. f Neil Watts, Director Date Development Service Division a:shlexemp CAG-01-124 Memorandum of Understanding Impact Mitigation MEMORANDUM OF UNDERSTANDING between CITY OF RENTON and WASHINGTON STATE DEPARTMENT OF TRANSPORTATION, SHORELINE, WASHINGTON Impact Mitigation I. INTRODUCTION The purpose of this memorandum is to develop an understanding between the City of Renton (Renton) and the Washington State Department of Transportation (WSDOT) concerning the mitigation of impacts to the riparian zone of Rolling Hills Creek in the vicinity of the SR-405/SR-167 interchange. II. GOAL AND DEFINITIONS The goal of this memorandum is to assure the in-basin mitigation of vegetation removal from the Rolling Hills Creek riparian zone. WSDOT proposes to improve safety features and reduce traffic congestion for Interstate (I)-405 southbound collector distributor traffic merging with traffic from State Route (SR)-167. The project will construct a flyover structure from the existing southbound SR-405 off-ramp to the southbound SR-167 on- ramp and will modify the existing southbound SR-405-to-northbound SR-167 ramp. The proposed flyover structure will eliminate riparian habitat surrounding Rolling Hills Creek, which is Critical Habitat for Puget Sound Evolutionarily Significant Unit Chinook salmon (Oncorhynchus tshawytscha), a species listed as Threatened under the Endangered Species Act. The National Marine Fisheries Service (NMFS) has authority to ensure recovery of Puget Sound ESU chinook salmon. Rolling Hills Creek enters the flyover project site from the east and passes under the interchange through a 1.2 in (48 in) concrete culvert approximately 460 in (-1500 ft) to the Panther Creek wetland,the P-9 drainage channel, and to Springbrook Creek. Approximately 280 in (3000 ft2) of riparian vegetation will be eliminated to accommo- date the flyover ramp. Following on-site discussions with the National Marine Fisheries H:\DWISION.S\UTILITIE.S\DOCS\2001\2001-376.doc Memorandum of Understanding Impact Mitigation Page 2 Service, it is agreed that there is insufficient area to accommodate mitigative riparian planting for Rolling Hills Creek in the project vicinity or anywhere in the WSDOT right of way downgradient to Springbrook Creek. Accordingly, WSDOT opened discussions with Renton to explore an agreement for riparian mitigation efforts within the Springbrook Creek basin. The proposed mitigation site is located on City of Renton property along the west side of Springbrook Creek, next to the King County Metro Treatment Plant, north of Grady Way and west of Oaksdale Ave. (see attached map). A temporary Construction Easement to be granted by Renton is included in Exhibit A. III. CRITERIA AND PROCEDURES Under this Memorandum of Understanding, Renton will allow WSDOT to construct on Renton property approximately 770m2 (8288 ft2) of habitat enhancements and restoration along Springbrook Creek as mitigation for the impacts to Rolling Hills Creek by the proposed SR 405/167 interchange flyover structure. The plant installation for restoration will be completed no later than 2003. The plant establishment period for the project will extend for 3 years up to 2006, or as otherwise required by NMFS or other agency permit conditions. 1. WSDOT is responsible for the maintenance, monitoring, and success of the mitigation project as required by all local, state and federal permits. Renton will not be held accountable for ensuring the success of the WSDOT mitigation project. 2. Renton will be responsible to immediately inform WSDOT in writing of any land use changes at the site that adversely impact the riparian planting or riparian function at the site. 3. WSDOT's mitigation project cannot interfere with Renton's current use of the site, which consist of a trail and the channel that was constructed for flood control and habitat benefits. The current use includes Renton's ability to maintain the trail or the channel, if needed in the future. If in the future the WSDOT Mitigation interferes with Renton's current use of the site or ability to maintain said trail and flood control facilities, Renton may terminate this Memorandum of Understanding and require WSDOT to remove the mitigation project from Renton's property. 4. Access for on-going maintenance of WSDOT's mitigation project shall be coordinated with the City Parks Department. IV. LEGAL RELATIONS Each of the PARTIES to this AGREEMENT shall protect, defend, indemnify, and save harmless the other PARTY, its officers, officials, employees, and agents, while acting within the scope of their employment as such, from any and all costs, claims,judgment, and/or awards of damages, arising out of, or in any way resulting from, each of the PARTY's negligent acts or omissions. No PARTY will be required to indemnify, defend, or save harmless the other PARTY if the claim, suit, or action for injuries, death, Memorandum of Understanding Impact Mitigation Page 3 or damages is caused by the sole negligence of the PARTY. Where such claims, suits, or actions result from concurrent negligence of the PARTIES, the indemnity provisions provided herein shall be valid and enforceable only to the extent of the PARTY's own negligence. Each of the PARTIES agrees that its obligations under this subparagraph extend to any claim, demand, and/or cause of action brought by, or on behalf of, any of its employees or agents. For this purpose, each of the PARTIES, by mutual negotiation, hereby waives, with respect to each of the other PARTY only, any immunity that would otherwise be available against such claims under the Industrial Insurance provisions of Title 51 RCW. In the event that any of the PARTIES or combination of the PARTIES incurs any judgment, award, and/or cost arising therefrom, including attorneys' fees, to enforce the provisions of this Section, all such fees, expenses, and costs shall be recoverable from the responsible PARTY or combination of the PARTIES to the extent of that PARTY's/those PARTIES' culpability. This indemnification shall survive the termination of this AGREEMENT. This Memorandum of Understanding is subject to revision upon agreement of the following agencies: Washington State City of Renton Department of Transportation Signe Dated Si : Jesse Tanner, Mayor Dated SeufrrKing-Gomty LL Area e �/ 6r r Attes A, -- mxr*4,Petcrsen,City Cleric MR _ yet ISO Mitigation Site t- � [ MollMill a rX 24 46 • _ i y} ` Memorandum of Unde amnding Impact Mitaa Qr Page i . >�< �\ a �\ ± , , ,£o e . , , .m/ Figure 2 Proposed mitigation site along west side ofSpringbr ok Creek next to the King County Metro Treatment Plant lo c■ted north ofGrady Way. The specific lo cation will hedetermined by WSDOT Landscape Service w PLANNING/BUILDING/PUBLIC WORKS DEPARTMENT Y Renton City Hall 1055 South Grady Way, Renton, WA 98055 ♦ es ❑ UTILITY SYSTEMS DIVISION 425.430 7234 Fax: 425.430-7241 ❑ TRANSPORTATION SYSTEMS DIVISION 425.430-7321 Fax: 425.430.7376 To: j„� ' DATE: O JOB No. RE: IS J Pq6w tle . r rri 'f' P O WE ARE SENDING YOU ❑ ATTACHED ❑ Under Separate Cover via the following items: ❑ SHOP DRAWING ❑ PRINTS ❑ REPRODUCABLE PLANS ❑ SPECIFICATIONS ❑ ORIGINALS ❑ COPY OF LETTER ❑ COPIES DATE NUMBER DESCRIPTION / REMARKS ! z. MESSAGE: hti�c �r, Hr i�►s ✓✓r !.'use L-Ifur<rvt rs Uegry hp(rl & l Garl 41V N, , YpVt ice - rl 4f cairtey/ (14.5 These are transmitted as checked below: ❑ FOR SIGNATURE APPROVAL ❑ APPROVED AS SUBMITTED ❑ RESUBMIT COPIES FOR APPROVAL FOR YOUR USE ❑ APPROVED AS NOTED ❑ SUBMIT COPIES FOR DISTRIBUTION ❑ AS REQUESTED ❑ RETURNED FOR CORRECTIONS ❑ RETURN CORRECTED PRINTS ❑ FOR REVIEW AND COMMENT ❑ ❑ PRINTS RETURNED AFTER LOAN TO US Copies to: dell,From: /� V( f n" �f() IF ENCLOSURES ARE NOT AS NOTED, PLEASE NOTIFY US AT ONCE. PBPW5001 09/99 bh ."Wen Q-iynn Date age 1 From: "Davis, Gary" <davisg@WSDOT.WA.GOV> To: .'.rstraka@ci.renton.wa.us"' <rstraka@ci.renton.wa.us> Date: 3/21/01 3:33PM Subject: Date Ron: I have attached the riparian planting proposal that has been negotiated with NMFS. Please provide any comments that the City may have regarding this proposal. I appreciate the City of Renton's interest in partnering with WSDOT to enhance riparian functions as pertains to the recovery of the listed species Chinook salmon. This agreement will facilitate the implementation of the SR 405/167 interchange modification project. «NMFS Mitigation Letter.doc>> CC: "Bigler, Brian S." <BiglerB@WSDOT.WA.GOV>, "Johnson, John H." <JohnsJH@WSDOT.WA.GOV>, "Henry, Kim" <HenryK@WSDOT.WA.GOV> `All Qne Qne uynn- NMFS Mitigation Letter.doc I I March 21, 2001 Tom Gibbons National Marine Fisheries Service 510 Desmond Drive SE, Ste. 103 Lacey,WA 98503 Re: Addendum to SR 405, SR 167 Interchange Biological Assessment: Addressing Riparian Mitigation Dear Mr.Gibbons: As discussed in the SR 405: SR 167 Interchange Modification Biological Assessment,the Washington State Department of Transportation(WSDOT)is proposing to improve safety features and reduce traffic congestion for State Route(SR)405 southbound collector distributor traffic merging with traffic from SR 167, in the City of Renton,King County, Washington. The project will construct a flyover structure from the existing southbound I-405 off-ramp to the southbound SR 167 on-ramp, and will modify the existing southbound SR 405-to-northbound SR 167 ramp to accommodate future widening of SR 405 for direct transit access projects. This project will create an additional 3052 m2(10013.1 ft2)of impervious surface. Stormwater from 7062 m2(23169.3 ft2)9 or 231 percent of the new impervious surface area, will be treated and detained. A Dry Pond,biofiltration swales,and vegetative filter strip are the stormwater treatment BMPs selected for this project. Additionally,thirteen poplar and black cottonwood trees will be removed from the vicinity of Rolling Hills Creek in the northeast interchange quadrant to facilitate the flyover ramp. Fill material and road surfaces have raised the ground surface well above the surrounding topography,and has interrupted the natural functions of Rolling Hills Creek. There are no known comprehensive examinations for fish presence in Rolling Hills Creek, and no protected species are assumed present. Rolling Hills Creek enters the project site from the east and flows through a straight channel with banks cut at approximately a vertical slope. The stream passes under the interchange through a 1.2 in(48 in)concrete culvert approximately 460 in(-1500 ft)to the Panther Creek wetland,the P-9 drainage channel,and to Springbrook Creek. Springbrook Creek is known to support Puget Sound ESU chinook salmon. Within the project vicinity,Rolling Hills Creek is a DNR Type 3 water. The stream is highly channelized with no Large Woody Debris(LWD),rocks,or other obstructions to flow. The substrate is primarily gravel with minor components of larger cobbles. National Marine Fisheries Service(NMFS)Habitat Pathways within Rolling Hills Creek are At Risk,or Not E Allen Quynn - NMFS Mitigation Letter.doc P'age 2 Properly Functioning. The riparian zone in the project vicinity is limited,and vegetated with Himalayan blackberry,reed canarygrass,soft rush,black cottonwood and poplar trees, some shrubs,and grasses. Approximately 280 m2(3000 ft2)of riparian vegetation, including the thirteen poplar and black cottonwood trees,will be eliminated to accommodate the flyover ramp. Following discussions with you on site, it is agreed that there is insufficient area to accommodate mitigative riparian planting for Rolling Hills Creek in the project vicinity or anywhere in the WSDOT right of way downgradient to Springbrook Creek. Accordingly,WSDOT opened negotiations with the City of Renton to explore a partnership in riparian mitigation efforts within the Springbrook Creek basin. The City of Renton has invited WSDOT to undertake riparian zone rehabilitation to improve the Springbrook Creek corridor in an area adjacent to the Metro Sewer Treatment Plant(Figure 1). i Springbrook Riparian Zone Rehabilitation WSDOT has approached the City of Renton to partner in the rehabilitation of City property �\J,t1 adjacent to Springbrook Creek and the Metro Sewage Treatment Plant(Figure 1). This 001 agreement will be finalized with the City subsequent to NMFS concurrence with the SR 405: SR 167 Interchange Modification Biological Assessment. The proposal is looked upon favorably by t e City Department,however implementation will require final approval by the City Council. In the event that the Metro Sewer Treatment site is not approved,a subsequent site and comparable area along Springbrook Creek will be advanced to the Council. Upon approval by the Council,the site will be surveyed and the GPS coordinates will be provided to NMFS. f Springbrook Creek is located east of SR 167 and south of the City of Renton. The proposed e rehabilitation site is lacking in endemic riparian vegetation,and invasive reed canarygrass and Himalayan blackberry leave the stream open to solar radiation and piscivorous birds. Project Goals This project will incorporate features to create a natural riparian habitat. Habitat improvements will include the removal of existing invasive plants and the installation of endemic species. E Proposed Restoration Remove existing invasive plant species. The space available to rehabilitation is limited to an approximately 9.0 in(30 ft)buffer between Springbrook Creek and the Metro Sewage Plant. The total area to be rehabilitated will be approximately 560 m2(6000 ft2). Plantings will include a combination of shrubs,coniferous and deciduous trees in random clusters. The City of Renton has title to the riparian area to be restored and the adjacent stream reach. Final design of each of these proposed restorations will be subject to approval by the City of Renton. i Allen Qu nn NMFS Mitigation Letter.doc Page 3 Conclusions This proposed habitat restoration project guarantees the restoration of 560mz(6000 ftz)of Springbrook Creek riparian habitat as a 2:1 mitigation ratio for the removal of poplar and black cottonwood trees from the Rolling Hills Creek vicinity. The commitment b SDOT tor. mitigate the riparian impacts associated with the interchange project is i perpetui y. The he vot fee restoration project will be implemented as a project by WSDOT. In thee an agreement can't be reached with the City of Renton,WSDOT will reinitiate consultation with NMFS. The conservation measures outlined in Appendix A regarding maintenance and monitoring of the riparian planting area will be implemented as stated. This proposal fulfills our mitigation obligations under the Endangered Species Act for impacts arising from the proposed SR 167 flyover ramp construction. For questions or additional information on this project,please contact Brian Bigler at 206-440-4951. Sincerely, Gary Davis Assistant Environmental Program Manager/Biology cc: Kim Henry,WSDOT John Johnson, WSDOT Ron Straka,City of Renton i F I i -Allen Qu,ynn - NMFS Mitigation Letter.cloc Page 4 'Z -IN Allen Quynn - NM FS Mitigation Letter.doc Page 5 , _ 3 Coy `� a. „ e f _..- -r- `v.: � �•n : �}. r s nTeE: _� s Ir �sasr. ;lam j� � �; '� a�'��\ � 3 •_ i K/ y� Y�'�s' a is�h• _t � ,,mew ■ � :� ?8 I I � v .. � s ' ty �, c aa26 t■� I/,:i f� e` ' 25 3016 \� Tukwila + + will '-f -- � Jam■ � 7 � fiea D ■i tl:■ptd+®ufn Ikimm Yr®�l�ME nM6 sates m.=vscs ���Q n s.�:1:r ew vert use nr:wcsaa Figure 1. Springbrook Creek riparian zone mitigation. ( 7i'FlrLet 'rA, S kG�✓j C��yly I Allen Quynn - NMFS Mitigation Letter doc Page Appendix A. SR 167/SR 405 Interchange Modification Conservation Measures Planting Details The Washington State Department of Transportation(WSDOT)will perform riparian planting per the details outlined on page 2 of a letter dated March 21,2001 from Gary Davis, WSDOT to Tom Gibbons,National Marine Fisheries Service(NMFS). Standards of Success Riparian plantings are expected to achieve certain post-planting survival levels. As a result, riparian planting will be planted by WSDOT during the dormant season. The initial riparian planting is anticipated to be completed by the end of the dormant season in 2002(about March or early April at latest). Further,riparian plantings will be maintained two times per year in the following manner: First year after planting: 100%planted species are alive. Plant replacement has occurred if necessary. Weed species in planting areas are controlled. Second year: 80%planted species are alive. Open areas of more than six plants within planting areas will be replanted. Weed species are not dominating with desired plant species. Third and Fourth years: 70 to 80%aerial coverage is observed, including recruitment of native species. Weed species are not dominating with desired plant species. Fifth year: Aerial cover observed as mass of vegetation with diversity of plant species. Planted and recruited species dominate the site and out-compete weed species. If chemical hand spraying is used as a method of plant maintenance,it will be done when wind speed is no greater than 5 miles per hour using Rodeo and/or Roundup. en 'ynn = NMFS Mitigation Letter doc Page 7 As the riparian plantings are proposed to be planted on City of Renton property, WSDOT will include in their proposal the following contract clauses with the city: • The intent of this project is to make the potential effects of the SR 167/SR 405 interchange modification project insignificant and discountable. As a result,the riparian planting project is aimed at achieving long term riparian function benefits to Endangered Species Act listed Puget Sound Chinook. �✓(�- �F i..� �.N'>< y,o�'Fy i� writ{v� ? n • The City will immediately inform WSDOT in writing of any land use changes at the site that Tj iS e adversely impact the riparian plantings or riparian function at this site. If land use changes that degrade the function of the site occur,WSDOT will contact NMFS in o writing regarding SR 167/SR 405 conservation measures. soy �5 • If a formal agreement for riparian planting(per above)is not reached with the City of Renton by January 10,2002 then WSDOT will contact NMFS to arrange alternative planting proposals for the proposed action. Stream Monitoring for Riparian Vegetation Annual Report shall include: %live plants of each specie in planting areas. i k Photo Log at consistent specified locations. Observed weed control. Actual location of riparian vegetation A copy of each annual report will be mailed to the Washington State NMFS Habitat Branch Chief at 510 Desmond Drive SE, Suite 103,Lacey,Washington and identified as"SR 167/SR 405 Interchange Modification Project,WSB 00-457. Allen Quynn NMFS Mitigation Letter.doc Page 8 3 k 1 i AdShl MA m Washington State M e m o ran d u m Department of Transportation May 23, 2001 TO: Allen Quynn City of Renton RECEIV , Surface Water Utility Division c ` MAY 2 3 2001 CITY OF RENTON FROM: J. Johnson/Manny Quinteiro UTILITY SYSTEMS MS 143 SUBJECT: M. O. U. Comments Attached please find copies of the M.O.U. between the City of Renton and WSDOT mitigation site along Springbrook Creek for your review and comment. The final document will be submitted to the City of Renton for approval. If you have any question or need additional information, please call Manny Quinteiro at (206)440 4578. JJ:mq Attachment: Memorandum of Understanding 4 pages. cc: project files. DOT Form 700-008 EF Revised 5/99 Memorandum of Understanding Impact Mitigation MEMORANDUM OF UNDERSTANDING between THE CITY OF RENTON and WASHINGTON STATE DEPARTMENT OF TRANSPORTATION, SHORELINE, WASHINGTON Impact Mitigation I. INTRODUCTION The purpose of this memorandum is to develop an understanding between the City of Renton (Renton) and the Washington State Department of Transportation (WSDOT) concerning the mitigation of impacts to the riparian zone of Rolling Hills Creek in the vicinity of the SR 405/167 interchange. II. GOAL AND DEFINITIONS The goal of this memorandum is to assure the in-basin mitigation of vegetation removal from the Rolling Hills Creek riparian zone. WSDOT proposes to improve safety features and reduce traffic congestion for State Route (SR) 405 southbound collector distributor traffic merging with traffic from SR 167. The project will construct a flyover structure from the existing southbound I-405 off-ramp to the southbound SR 167 on-ramp and will modify the existing southbound SR 405-to-northbound SR 167 ramp. The proposed flyover structure will eliminate riparian habitat surrounding Rolling Hills Creek, which is Critical Habitat for Puget Sound Evolutionarily Significant Unit Chinook salmon (Oncorhynchus tsha"tscha), a species listed as Threatened under the Endangered Species Act. The National Marine Fisheries Service (NMFS) has authority to ensure recovery of Puget Sound ESU Chinook salmon. Rolling Hills Creek enters the flyover project site from the east and passes under the interchange through a 1.2 in (48 in) concrete culvert approximately 460 m (-1500 ft) to the Panther Creek wetland, the P-9 drainage channel, and to Springbrook Creek. Approximately 280 in (3000 ft2) of riparian vegetation will be eliminated to accommo- date the flyover ramp. Following on-site discussions with the National Marine Fisheries Memorandum of Understanding Impact Mitigation Page 2 Service, it is agreed that there is insufficient area to accommodate mitigative riparian planting for Rolling Hills Creek in the project vicinity or anywhere in the WSDOT right of way downgradient to Springbrook Creek. Accordingly, WSDOT opened discussions with Renton to explore a partnership in riparian mitigation efforts within the Springbrook Creek basin. Renton is currently planning to improve the Springbrook Creek riparian corridor in a joint effort with King County and the Army Corps of Engineers, and will accept WSDOT as an additional partner. Green-Duwamish Ecosystem Restoration Study Springbrook Creek is located east of SR 167 and south of Renton. The city is planning channel modifications within the reach between SW 341h and SW 401h Street, and between SW 16`h and SW 23rd Street. The proposed mitigation site is located on City of Renton property along west side of Springbrook Creek, next to the King County Metro Treatment Plant, north of Grady Way and west of Oaksdale Ave. (See attached map). III. CRITERIA AND PROCEDURES Renton and WSDOT hereby mutually agree to engage in a partnership to provide enhancement and restoration of approximately 740m2 (8000 ft2) of Springbrook Creek riparian habitat as mitigation for the impacts to Rolling Hills Creek by the proposed SR 405/167 interchange flyover structure. The plant installation for restoration will be completed no later than 2003. The plant establishment period for the project will extend for 3 years up to 2005. 1. WSDOT is responsible for the maintenance, and plant establishment success of the mitigation project through the plant establishment period. 2. The City will be responsible to immediately inform WSDOT in writing of any land use changes at the site, that adversely impact the riparian planting or riparian function at the site. This Memorandum of Understanding is subject to revision upon agreement of the following agencies: Washington State City of Renton Department of Transportation Surface Water Utilities Division Signed: Craig Stone Signed: Gregg Zimmerman South King County Area Administrator t � Project Narrative The Washington State Department of Transportation (WSDOT) proposes that the enhancement work along Springbrook Creek is exempt per "c. A project primarily designed to improve fish and wildlife habitat..." from page 2 of the Submittal Requirements for Shoreline Exemption. The current use of the site is as a 9.0 m (30 ft) buffer between Springbrook Creek and the Metro Sewage Plant. This existing stream bank has no structures or residential units. The proposed rehabilitation site is lacking in endemic riparian vegetation, and invasive reed canarygrass and Himalayan blackberry leave the stream open to solar radiation and piscivorous birds. This project will incorporate features to create a natural riparian habitat. Habitat improvements will include the removal of existing invasive plants and the installation of endemic species. The City of Renton has title to the riparian area to be restored and the adjacent stream reach. Final design of each of these proposed restorations will be subject to approval by the City of Renton. This proposed habitat restoration project guarantees the restoration of 560m2 (6000 ftZ) of Springbrook Creek riparian habitat as a 11 mitigation ratio for the removal of poplar and black cottonwood trees from the Rolling Hills Creek vicinity. The commitment by WSDOT to mitigate the riparian impacts associated with the interchange project is in perpetuity. The restoration project will be implemented as a project by WSDOT. Conservation measures regarding maintenance and monitoring of the riparian planting area will also be implemented. The cost is estimated at $40,953. If a formal agreement for this riparian planting is not reached with the City of Renton by January 10, 2002, WSDOT will contact the National Marine Fisheries Service to arrange alternative planting proposals. First year after planting: 100% planted species are alive. Plant replacement has occurred if necessary. Weed species in planting areas are controlled. Second year: 80% planted species are alive. Open areas of more than six plants within planting areas will be replanted. Weed species are not dominating with desired plant species. Third and Fourth years: 70 to 80% aerial coverage is observed, including recruitment of native species. Weed species are not dominating with desired plant species. Fifth year: Aerial cover observed as mass of vegetation with diversity of plant species. Planted and recruited species dominate the site and out-compete weed species. -------- kill s. Mitigation 001 INN 5 V- 7 age. Y T S : Ae S JbM JUL� Project Site AI oil .............. fit JW J[ slow 30. 7 Tukwila f Pf 24 A a. -;r ........... J-U2.- M ko KE D TopoQuab Capyd&(0 W"D,1 o Ymumith ME MM 5-Dee:USGS 742 ft St*:1:AM DvW&110 Da -WG%4 Springbrook Creek riparian zone mitigation. x> : s Y l Gl/ vs � z 0 3 ' L; �ry 3r�. s •,� > ;y IN "RIN �.0 0' 100M 0' 100yd Proposed mitigation site along west side of Springbrook Creek next to the King County Metro Treatment Plant located north of Grady Way. The specific location will be determined by WSDOT Landscape Services. 5 0 900 99 I 11 99 „V nLL T 4 f00 i69 C ♦ „ \ NJ 41- Q1 515 t O O 9 x � E 4Ds / SU 00 F 99 H f 167 lD 4'I P C) ,d OAKDALE STREAM BUFFER ROADSIDE PLANTING AREA PLANTING AREA _ VICINITY MAP a ' 405 SCu�EE I„FEET GRADY WAY 0 d _57REAMBR00K CREEK NOTE: EXISTING TRAIL ACCESS AT OAKDALE AND GRADY WAY TO BE COORDINATED WITH THE CITY OF RENTON. d ALTERNATE ACCESS CAN BE ARRANGED NEAR L ENTRANCE TO METRO SEWAGE TREATMENT PLANT: o COORDINATE BOLLARD REMOVAL WITH CITY OF RENTON. MITIGATION AREA N (D O O O N O O METRO SEWAGE TREATMENT PLANT a L O) T SITE ACCESS MAP RErGII Do.„ STATE FED. PROJ.NO. SR 405 PP 1 DESIGNED BY O.PETERS 10 WASH SR 167 I/C MODIFICATION ENTERED BY K.MCLEAN � Washington State CHECKED BY J.WRIGHT 99A059 �I/ Department of Transportation SHEET PROJ. ENGR. J.JOHNSON REGIONAL ADM. J.OKAMOTO CONTRACT NO. PLANTING PLAN MAPS IO70 F DATE DATE REVISION BY SHEETS SPRINCBROOK CREEK CATCH BASIN 20 m 80 m EXISTING TRAIL �----- -- --- - -- ---- - - - - ----- - - ------- -_yr--Sw�-Slir-- ---- - --5-_S --= ---- _ ----- �- -- - fir,- - - - E S 3 S 2 LEGEND PLANTING AREA QUANTITY TAB - THIS SHEET ONLY EXISTING FEATURES NOTES: QUANTITY 1. DO NOT DISTURB EXISTING SWALE. S1 S2 S3 SPACING SYMBOL ITEM TREES AND SHRUBS LOW MIX 2. CONIFEROUS EVERGREEN TREES FOR STREAM BUFFERS SHALL BE STAKED EVERGREEN HUCKLEBERRY 22 46 20 lm O.C. UNDERGROUND. SEE PLANTING DETAILS. METRO SEWAGE TREATMENT PLANT SALAL 104 213 95 .6m O.C. x- -x-. -x- -x- FENCE 3. LOW MIX AREAS SHALL HAVE COMPOST ACCESS TO EXISTING TRAIL FROM MEDIUM MIX - > DRAINAGE SWALE LAYER ONLY INSTALLED AFTER PLANTING. METRO SEWAGE TREATMENT TALL OREGON GRAPE 10 20 9 1.5m0.C. MEDIUM AND HIGH MIX AREAS SHALL HAVE PLANT BRIDGE PROPOSED FEATURE .5m RADIUS BARK RINGS INSTALLED RED FLOWERING CURRANT 4 8 4 2m O.C. AROUND EACH SHRUB. ENTIRE PLANTING AREA SHALL BE SEEDED WITH SPECIAL SNOWBERRY 8 16 8 1.8m0.C. ----------- LIMIT OF WORK AND LIMIT SEEDING MIX. TALL MIX OF SELECTIVE CLEARING AND RED-OSIER DOGWOOD 5 10 5 2m O.C. GRUBBING AND WEED CONTROL BLACK TWINBERRY 5 11 5 1.5mO.C. -Sw--Sw-- STRAW WATTLES p WAX MYRTLE 2 4 2 3m D.C. STATE OF STORM BEAKED HAZEL 1 2 1 4m O.C. PROTECDTRIONNINSERT WASHINGTON o 0 Iv/ OREGON ASH 2 REGISTERED 0 1 AS PLACED WESTERN RED CEDAR 1 2 1 AS PLACED LANDSCAPE ARCHITECT a DOUGLAS FIR 0 5 1 AS PLACED B L >, BARK OR WOOD CHIP MULCH (m3) 5 9 5 v� COMPOST (m3) SEE NOTE 3 6 9 4 SALLY A. ANDERSON CERTIFICATE NO. 372 SPECIAL SEEDING MIX (m2) 181 387 172 DATE: DO NOT SCALE THIS DRAWING REGION STATEFED.AID PROJ.NO. DESIGNED BY D.PETERS 10 WASH � SR 405 SIR 167 I/C MODIFICATION PP4 ENTERED BY K.McLEAN Washington State CHECKED BY J.WRIGHT JOB NUMBER PROJ. ENGR. J.JOHNSON ., Department of Transportation 50T REGIONAL ADM. J.olcaMoro coNrn.cT NO. OF STREAM BUFFER PLANT I NG/TESC PLAN 170 DATE DATE REVISION BY SHEETS S.F. _ ROUTING SLIP $U SF 80 F DA TO ego ADDRESS MAIL STOP �// G MAIL STOP PHONE FAX ❑ For Action ❑ Per Your Request ❑ Per Our Conversation ❑ For Approval ❑ Read and Return ❑ Read&Route to Files ❑ For Signature ❑ For Your Information ❑ For Your Comments RECEIVED MAR 2 1 2001 CITY OF RENTON UTILITY SYSTEMS 4 ti Washington State Northwest Region °��� °�.� erue North 3. Sox 330310 Department of Transportation Sid Morrison �eatt?e.'NA 93133-9710 _Col-1-'1'CC0 March 12, 2001 Tom Gibbons National Marine Fisheries Service 510 Desmond Drive SE. Ste. 103 Lacey, WA 98503 Re: Addendum to SR 405, SR 167 Interchange Modification Biological Assessment Dear Tom: As discussed in the SR 405: SR 167 Interchange Modification Biological Assessment, the Washington State Department of Transportation (WSDOT) is proposing to improve safety features and reduce traffic congestion for State Route (SR) 405 southbound collector distributor traffic merging with traffic from SR 167, in the City of Renton, King County, Washington. The project will construct a flyover structure from the existing southbound I-405 off-ramp to the southbound SR 167 on-ramp, and will modify the existing southbound SR 405-to-northbound SR 167 ramp to accommodate future widening of SR 405 for direct transit access projects. This project will create an additional 3052 m' (10013.1 fr) of impervious surface. Stormwater from 7062 m' (23169.3 ft-), or 231 percent of the new impervious surface area, will be treated and detained. A Dry Pond, biofiltration swales, and vegetative filter strip are the stormwater treatment BMPs selected for this project. Additionally, thirteen poplar and black cottonwood trees will be removed from the vicinity of Rolling Hills Creek in the northeast interchange quadrant to facilitate the flyover ramp. Fill material and road surfaces have raised the ground surface well above the surrounding topography, and has interrupted the natural functions of Rolling Hills Creek. There are no known comprehensive examinations for fish presence in Rolling Hills Creek, and no protected species are assumed present. Rolling Hills Creek enters the project site from the east and flows through a straight channel with banks cut at approximately a vertical slope. The stream passes under the interchange through a 1.2 m (48 in) concrete culvert approximately 460 m (-1500 ft)to the Panther Creek wetland, the P-9 drainage channel, and to Springbrook Creek. Springbrook Creek is known to support Puget Sound ESU chinook salmon. Within the project vicinity, Rolling Hills Creek is a WDNR Type 3 water. The stream is highly channelized with no Large Woody Debris (LWD), rocks, or other obstructions to flow. The substrate is primarily gravel with minor components of larger cobbles. National Marine Fisheries Service (NMFS) Habitat Pathways within Rolling Hills Creek are At Risk, or Not Properly Functioning. The riparian zone in the project vicinity is limited, and vegetated with Himalayan blackberry, reed canarygrass, soft rush, black cottonwood and poplar trees, some shrubs, and grasses. Approximately 280 m- (3000 ft') of riparian vegetation, including the thirteen poplar and black cottonwood trees, will be eliminated to accommodate the flyover ramp. Following discussions with you on site, it is agreed that there is insufficient area to accommodate mitigative riparian planting for Rolling Hills Creek in the project vicinity or anywhere in the WSDOT right of way downgradient to Springbrook Creek. Accordingly, WSDOT opened negotiations with the City of Renton to explore a partnership in riparian mitigation efforts within the Springbrook Creek basin. The City of Renton has invited WSDOT to undertake riparian zone rehabilitation to improve the Springbrook Creek corridor in an area adjacent to the Metro Sewer Treatment Plant (Figure 1). Springbrook Riparian Zone Rehabilitation WSDOT has reached a tentative agreement with the City of Renton to allow the rehabilitation of City property adjacent to Springbrook Creek in the vicinity of the Metro Treatment Plant (Figure 1). This agreement will be finalized through a joint Memorandum of Understanding subsequent to NMFS concurrence with the SR 405: SR 167 Interchange Modification Biological Assessment. Springbrook Creek is located east of SR 167 and south of the City of Renton. The proposed rehabilitation site is lacking in endemic riparian vegetation, and invasive reed canarygrass and Himalayan blackberry leave the stream open to solar radiation and piscivorous birds. Project Goals This project will incorporate features to create a natural riparian habitat. Habitat improvements will include the removal of existing invasive plants and the installation of endemic species. Proposed Restoration • Remove existing invasive plant species. • The space available to rehabilitation is limited to an approximately 9.0 m (30 ft) buffer between Springbrook Creek and the Metro Sewage Plant. • The total area to be rehabilitated will be approximately 560 m' (6000 ft'). • Plantings will include a combination of shrubs, coniferous and deciduous trees in random clusters. The City of Renton has title to the riparian area to be restored and the adjacent stream reach. Final design of each of these proposed restorations will be subject to a joint plan with the City of Renton. Conclusions This proposed habitat restoration project guarantees the restoration of 560m' (6000 ftz) of Springbrook Creek riparian habitat as a 2:1 mitigation ratio for the removal of poplar and black U cottonwood trees from the Rolling Hills Creek vicinity. The restoration will be completed during 2001, and no later than 2002. This proposal fulfills our mitigation obligations under the Endangered Species Act for impacts arising from the proposed SR 167 flyover ramp construction. For questions or additional information on this project, please contact Brian Bigler at 206-440-4951. Sincerely, Gary Davis Assistant Environmental Program Manager/ Biology cc: Kim Henry, WSDOT John Johnson, WSDOT Ron Straka, City of Renton .\ "I �� i• ••;".� '• •„ ` "fir } r s Mitigation Site R. G� numgn 4 oi L 3...1 � e .,A�..w'--t ! perq „l• .T ;. :'� �i a '� � ,t.�j +, Il,y..• l of ti, r •� _ r 1 :. � � •, r� 1, �� �, ,y 1..gg��y�, } _f , 41 14 Project Site Ell 46 �Ilthl,.tcil ,� /, �•� ��.� _ — .-� _ i r T ` •albot4 ILM 25 p,` _• _ �� !Tukwilarl iz:� •G - - t `� 14 OIL mt :I ID IT.Qedo C.P.�Vwt 4 l900 Drlmmr Ynmomk NE Uft Somre Dan:USES 7•Q ft Scak:1:Y,MO Drtal:13.0 Ihn�:15 rSSr Figure 1. Springbrook Creek riparian zone mitigation. February 13, 2001 Tom Gibbons National Marine Fisheries Service 510 Desmond Drive SE, Ste. 103 Lacey, WA 98503 Re: Addendum to SR 405, SR 167 Interchange Modification Biological Assessment Dear Tom: As discussed in the SR 405: SR 167 Interchange Modification Biological Assessment,the Washington State Department of Transportation(WSDOT) is proposing to improve safety features and reduce traffic congestion for State Route (SR)405 southbound collector distributor traffic merging with traffic from SR 167, in the City of Renton, King County, Washington. The project will construct a flyover structure from the existing southbound I-405 off-ramp to the southbound SR 167 on-ramp, and will modify the existing southbound SR 405-to-northbound SR 167 ramp to accommodate future widening of SR 405 for direct transit access projects. This project will create an additional 3052 m2 (10013.1 ft2) of impervious surface. Stormwater from 7062 m2 (23169.3 ft), or 231 percent of the new impervious surface area, will be treated and detained. A Dry Pond, biofiltration swales, and vegetative filter strip are the stormwater treatment BMPs selected for this project. Additionally,thirteen poplar and black cottonwood trees will be removed from the vicinity of Rolling Hills Creek in the northeast interchange quadrant to facilitate the flyover ramp. Fill material and road surfaces have raised the ground surface well above the surrounding topography, and has interrupted the natural functions of Rolling Hills Creek. There are no known comprehensive examinations for fish presence in Rolling Hills Creek, and no protected species are assumed present. Rolling Hills Creek enters the project site from the east and flows through a straight channel with banks cut at approximately a vertical slope. The stream passes under the interchange through a 1.2 in (48 in) concrete culvert approximately 460 in (-1500 ft)to the Panther Creek wetland,the P-9 drainage channel, and to Springbrook Creek. Springbrook Creek is known to support Puget Sound ESU Chinook salmon. Within the project vicinity, Rolling Hills Creek is a WDNR Type 3 water. The stream is highly channelized with no Large Woody Debris (LWD),rocks, or other obstructions to flow. The substrate is primarily gravel with minor components of larger cobbles. National Marine Fisheries Service(NMFS) Habitat Pathways within Rolling Hills Creek are At Risk, or Not Properly Functioning. The riparian zone in the project vicinity is limited, and vegetated with Tom Gibbons;NMFS February 13,2001 Page 2 Himalayan blackberry,reed canarygrass, soft rush, black cottonwood and poplar trees, some shrubs, and grasses. Approximately 280 m2 (3000 ft2) of riparian vegetation, including the thirteen poplar and black cottonwood trees, will be eliminated to accommodate the flyover ramp. Following discussions with you on site, it is agreed that there is insufficient area to accommodate mitigative riparian planting for Rolling Hills Creek in the project vicinity or anywhere in the WSDOT right of way downgradient to Springbrook Creek. Accordingly, WSDOT opened negotiations with the City of Renton to explore a partner i in riparian mitigation efforts within the Springbrook Creek basin. e City of Renton is currently planning to improve the Springbrook Creek riparian corri or in joint effort with King County and the Army Corps of Engineers, and will accept WSDOT as an additional partner. Green-Duwamish Ecosystem Restoration Study Y Springbrook Creek is located east of SR 167 and south of the City of Renton. The City of Renton is planning channel modifications within the reach between SW 34`h Street and SW 40`h Street, and between SW 16`h Street and SW 23rd Street(Figure 1). The site is lacking in riparian vegetation and invasive reed canarygrass and Himalayan blackberry leave the stream open to solar radiation. The lack of a canopy also provides access to piscivorous birds. There is essentially no instream habitat and most reaches would benefit from restoration. Project Goals The City of Renton and the Natural Resource Conservation Service (MRCS) are implementing a ✓ roject to increase the capacity of lower Springbrook Creek. This project will incorporate fish �i and wil ifVhabitat features into the City-NRCS project during and after construction. The goal is to cr ate al habitat for fish rearing and storm refuge. Habitat impr6 ements will include planti gs iriparian corridor and placement of large woody debris-in' the creek. Further, 14 certain reaches of the stream will benefit from two-stage channeling (expanding the creek U channel width by cutting two levels of channel embankment). Proposed Restoration • Place LWD and plantings in a two-stage re-channeling reach between SW 16`h Street and SW 23' St. with minimal disturbance of the low flow channel. • Place LWD and plantings in a single-stage re-channel on the west side of the reach between SW 3401 and SW 40`" Streets with no disturbance of the low flow channel. • A 30-ft buffer will be planted and LWD placed between SW 23rd Street and SW 27`h Street. • Placement of small woody debris in dendrites Tom Gibbons;.NMFS February 13,2001 Page 3 • Construction of backwater areas at 1/4 mile intervals to provide refuge habitat. Backwater habitat will be approximately 4 ft wide at the confluence with Springbrook Creek, and meander with the existing slope and ending at ground elevation. • Create riparian topographic complexity with cut material from backwater habitat construction. • Plantings will include a combination of shrubs, coniferous and deciduous trees in random clusters. ✓The City of Renton has obtained title to much of the stream reach to be restored. Final design of each these proposed restorations will be subject to a joint plan with the City of Renton and Army Corps of Engineers. Conclusions and Recommendations The Lower Springbrook Reach can be cost-effectively restored with the proposed habitat improvements. As part of the final design, WSDOT will conduct a final site survey, geotechnical investigation, and hydrologic/hydraulic and sediment transport analysis. This proposed joint habitat restoration project anticipates federal funding within 2001. WSDOT guarantees the restoration of 560m2 (6000 ft) of Springbrook Creek riparian habitat as a 2:1 mitigation ratio for the removal of poplar and black cottonwood trees from the Rolling Hills Creek vicinity. The restoration will be completed during 2002, and no later than 2003. If this goal is not met, WSDOT will increase the mitigation ratio according to an agreement to be reached with NMFS. This proposal fulfills our mitigation obligations under the Endangered Species Act for impacts arising from the proposed SR 167 flyover ramp construction. For questions or additional information on this project, please contact Brian Bigler at 206-440-4951. Sincerely, GARY DAVIS Assistant Environmental Program Manager/Biology Tom Gibbons;NMFS February 13,2001 Page 4 _ j111�1 �.k Y 5 9 a III c t v. • • • - , � k�•.��� �.� i 3llil � •III�� 0' '200M 0' '200Yd a .. 3 } Figure 1. Springbrook Creek Ecosystem Restoration Project vicinity. Renton, Washington. Tom Gibbons;NMFS February 13,2001 Page 5 r r � Yi IIri�3F p Ys q, �a 0' '200M y 0' '200yd � . a Figure 1. Springbrook Creek Ecosystem Restoration Project vicinity. Renton, Washington. Continued.... L len Qu nn - Re: Draft' ation letter Page 1 Y g z From: Allen Quynn To: S., Bigler, Brian Date: 2/14/01 8:30AM Subject: Re: Draft mitigation letter I've reviewed the letter and have a few comments. The"Project Goals" paragraph on the second page should be removed. The joint Springbrook Creek Widening and Habitat Improvement Project with NRCS is not really related to the Ecosystem Restoration Study which is the project WSDOT will be using for its mitigation. ERS is an entirely separate project that will add additional habitat improvements to those established under the City/NRCS Project. This paragraph also draws attention to the fact that we will be widening the channel which might raise some concern with NMFS. The best thing would be to leave the City/NRCS Project out of the letter all together. The only other concern is the issue with timing of the construction of these projects. As I've already said, the City is not going to commit to a specific time these projects will be constructed. Good luck. >>> "Bigler, Brian S." <BiglerB@WSDOT.WA.GOV> 02/13/01 07:35AM >>> Allen, Thank you for your assistance in this cooperative effort for Springbrook Creek habitat restoration. I've drafted a letter laying out the WSDOT mitigation guarantee for the National Marine Fisheries Service, and would much appreciate you reviewing my explanation for accuracy. I'll call you later this morning. «NMFS Addendum Letter.doc>> Allen Quynn Rolling Hills Mitigation ` _ Page 1 From: Allen Quynn To: Bigler, Brian Date: 2/5/01 3:59PM Subject: Rolling Hills Mitigation Dear Mr. Bigler: In response to your e-mail on 1/31/00, the City of Renton has several proposed projects in the Black River Basin which may provide mitigation opportunities for the loss of trees as result of the construction of the 1-405/SR-167 flyover. 1. Riparian Habitat Improvements - Project involves planting both sides of Springbrook Creek with native trees and shrubs to increase shade and cover for fish. The plantings would be concentrated along both banks between the average flow depth and the two year flow depth. Placement of in stream structures such as woody debris at select locations would also be included. 2. 34th St. culvert- Project consists of replacement of existing culverts at SW 34th St. which are acting as conveyance restrictions with a new box culvert. The project will include habitat improvements along the bank in the vicinity of the new culvert as well as in stream woody debris. 3. Ecosystem Restoration Study (Lower Springbrook Creek) - A collaborative effort with King County and the US Army Corps of Engineers to place large woody debris and native plantings along sections of Springbrook Creek between SW 16th St. and SW 34th St. The goal of which will be to increase the natural habitat for fish rearing and storm refuge. aX 4 aH 4. Wetland Mitigation Bank-The City is in the process of developing a wetland mifigation bank to be used as credits for public and private impacts to existing wetlands in the City. The bank will create wetlands from upland areas adjacent to Springbrook Creek and existing wetlands south of the Boeing Long Acres Site. The created wetland adjacent to Springbrook Creek will be hydraulically connected to the channel to provide fish rearing and storm refuge habitat. Please let me know if you require any further information. I can be reached at 425-430-7247. Sincerely, Allen Quynn Post-it®Fax Note 7671 Date 12, Ol pages To Q �r From I�Cv� Li gVI Co./Dept. w Co. C 1 Phone# Phone# Fax# _ [lilo_ `f US Fax# SITE NO. 7 Green-Duwamish G.I. Ecosystem Restoration Feasibility Study Project Description and Write-up Site Designation: Lower Springbrook Reach Location ■ The Springbrook Creek water supply watershed is located east of SR 167 and south of the City of Renton. The Creek flows north and west across SR 167 to the Black River Pump Station. Portions of Springbrook Creek are located within the City of Renton including the Lower Springbrook Site. This reach of Springbrook extends from SR 167 to upstream of the Black River Pump Station forebay. A portion of Upper Springbrook Creek is ineltided in the reach beeause of its similar habitat. The Git—A Renton is planning channel modifications within this reach between SW 30 Street and SW 40th Street and between SW 16th Street and SW 23Td Street. These modifications have been incorporated in this report. Refer to Springbrook Creek location map,Figure No. 2. Site Constraints/Problems Based on discussion in the field,the Corps identified appropriate locations for minimum disturbance channels. Such channeling was defined as one-stage and is to have minimal impacts on the surrounding habitat. Otherwise, two-stage channeling was designated where re-channeling was specified. In either case,the proposed channel has a higher cross sectional area than that of the existing channel to help prevent a decrease in the channel's hydraulic capacity. ■ Site constraints are described as follows in the City of Renton East Side Green River Watershed Project, Plan and Environmental Impact Statement, Volume I, September, 1997 (Renton ESGRWP) The site is lacking in riparian vegetation, and native canary grass and black berry shrubs leave the stream surface open to solar insulation. The existing canopy also provides access for fish-eating birds. There is essentially no instream habitat such as woody debris. Further, certain reaches of the stream would benefit from two-stage channeling. Project Goals ■ The goal at the Lower Springbrook reach is to create a natural habitat for rearing and storm refuge. Habitat improvements would include plantings in the riparian corridor and placement of large woody debris in the creek. Further, certain reaches of the stream would benefit from two-stage channeling. The City and the Natural Resource Conservation Service (NRCS) are implementing a project to increase the capacity of lower Springbrook Creek. The goal of this project will be to incorporate fish and wildlife habitat features into the City-NRCS project during and after construction. This will require continued coordination to ensure a good multi-purpose project. 22 Proposed Solutions ■ Alternative No. 1 -No Action: No modifications to the existing stream conditions. Habitat conditions would remain marginal. ■ Alternative No. 2 —Implement the following restoration activities: ■ Place LWD and plantings in a two-stage re-channeled reach between SW 16`h Street and SW 23ra Street with minimal disturbance of the low flow channel. Place LWD and plantings in a single-stage re-channel on the west side of the reach between SW 34`h Street and SW 40`h Street with no disturbance of the low flow channel ■ A 30-foot buffer will be planted and LWD placed between SW 23' Street and SW27th Street. ■ Placement of large woody debris would introduce stream shade and structure. Small woody debris should also be placed in dendrites. about 4 feet wide at the main channel and meander along the natural slope, narrowing gradually and ending at ground elevation. Dendrites should be created about every 1/4-mile along the main channel. ■ Hummocks can be formed with cut material from dendrite construction and re- channeling. Recommended Plan The no action alternative will not achieve the project goals and is not a viable option for this site. Alternative No. 2 is recommended to accomplish the project goals. The conceptual design for the recommended plan is depicted in the Lower Springbrook Reach Site Plan, See the attached Figure The two-stage channel configuration with riparian planting scheme can be found in the 2- Stage Channel Detail, Figure No. 13. Channel design dimensions were taken from the Renton ESGRWP. Plantings include a combination of shrubs, coniferous and deciduous trees to be planted in natural random clusters. Water fluctuation zone plants will further reduce water temperatures, increase dissolved oxygen levels, and bind the soil. Pacific willow and red alder, are to be staked in the water fluctuation zone along channel side slopes at a maximum ninety-degree angle. Quantity calculations for all 3 plant types in the water fluctuation zone (2 staking plants and slough sedge) were based upon a 3 row zone with one row of each type with plants 2-feet center to center and rows 1 to 2 feet apart and staggered. Each row, however, should be a random mix of the plant types. Refer to One Stage Channel Detail, Figure No. 12, for riparian plantings scheme along one-stage reaches. Approximately 1300 feet of the riparian planting work would be on City owned lands and between SW 271h Street and SW 301h Street. The remaining 3200 feet of riparian plantings would be on private property and requiring the permission of the property owner. Any instream habitat improvement would require the permission of the KC drainage district no 1, which owns a 40-foot width of ROW along the creek. 23 A Woody Debris Pool Detail, Figure No. 14, depicts a typical pool with rootwads keyed into the channel side slopes. Pools bottoms,where possible, should be lined with gravel. Excavating moderate pools for placement of wood will prevent it from decreasing the hydraulic capacity of the channel. At the outlet of each pool, an IS-to 24-inch cedar log should be placed along the channel bottom and buried in the banks. The log will prevent down cutting at the constriction. For construction quantity purposes, a woody debris pool with two pieces of debris was placed about every 50 feet. This is consistent with the placement of one piece of large woody debris every two stream widths for streams of about 12.5 feet wide. Dendrites serve as storm refuge and offer additional habitat. Construction of hummocks reduces the amount of excavated material to be hauled off-site and provides varied riparian topography. Refer to the Dendrite and Hummock Detail, Figure No. 15, for typical cross sections. Cost Items and Quantities Construction line items and quantities are shown in the MCACES portion of the attached engineering appendix. The table was developed as a standard to be used for all of the sites. As such, some of the line items are not applicable and are left blank. Quantities were calculated based on the information obtained HDR's site visit and from mapping. Given the extent of survey, geotechnical, hydrologic, and hydraulic information available at this time, a 40 percent contingency has been applied. Conclusions and Recommendations The Lower Springbrook Reach can be cost-effectively restored via the above proposed habitat improvements. As part of the final design,we recommend that a detailed site survey, geotechnical investigation, and hydrologic/hydraulic and sediment transport analyses be conducted. Also an analysis of local scour on LWD will be done. 24 NOTES: A. � 1 . ALL CHANNEL CONSTRUCTION TO BE 1 -STAGE l t j CHANNEL. SEE TYPICAL PLAN AND SECTION to- i DETAIL . FIG. NO. 12. t , 1 2. LOCATE LARGE WOODY DEBRIS EVERY 50' ,_ SEE DETAIL. FIG. NO. 14 . r I[ nk fill' 3. LOCATE DENDRITES EVERY 1� MILE +/—. �r�- l' i ALTERNATE SIDES OF CHANNEL AND EXTEND ' DENDRITE LENGTH TO TOP OF BANK. SEE FIG. 4. SEE 1 —STAGE CHANNEL DETAIL FOR RIPARIAN i PLANTING SCHEME• FIG. NO. 12. RIPARIAN COOR I DOR IS 140—FOOT WIDE EXCEPT WHERE IF '� ,r; "=;��'K ! NOTED. EXTEND IT FROM SW 16TH ST. TO 1( - ` � FOREBAY WHERE PLANTINGS ARE NEEDED. 5. EXTEND AN ASPHATL PATH FOR PUBLIC ACCESS ,I `� y i ALONG THE REACH BETWEEN SW 23RD AND = a j SW 16TH STREETS. � 1 ry LAJ cr 2�.-ui UJI N i : .. ` r-'- �; I \•� \ ` � \,' .. � /.� ) � r (.I� I:il;,,l!� � t� ,% I .�tn �a�... K•1 ri u t '!� W 1? ( .... ' --•tfZ ,- _,1'.� �i4n— _ _. -t1L�f� (!' 2 '\ Y '' i J �y!C' ) � f J ry l 1J r C rr SS a i 71I»I t.: I � x.. 1 f s 1 0 I'\y �h E 1 -+i 1 11 _ �,u 1�\ "`lilt of I 1; ILL- 4 ' Nil 1 •' , \ } ref } t'�/j - r•1 1 'i ' I 1 ��� n _ _- 1 r � I 1 i 7 tiw 1 dQ� -R t AR I AN. - (1 AGE C t NFL !G, �! DO r 7r` ! 1,f II l 1 I�l II `T 1 0 R-I-P-A AN-� [zT'WEEN _. g �p-�� ; ! v TH; lA SW�2RD TREE f �r ! 2? : , t RUCTION TO BE 2-STAGE :AL PLAN AND SECTION J A Y DEBRIS POOLS EVERY -7 7 IL . FIG. NO. 14 . EVERY 4 MILE +/ k P, AND EXTEND F CHANNEL IL -c-7- 0 TOP OF BANK. SEE FIG. xj S IN RIPARIAN CORRIDOR. .- EL DETAIL FOR RIPARIAN o N FIG. NO. 13. RIPARIAN tv. OOT WIDE EXCEPT WHERE FROM SW 16TH ST. TO NTINGS ARE NEEDED. y n, I PATH FOR PUBLIC ACCESS fn� CIO ,ETWEEN SW 23RD AND LLJ Ijq c, L NIP 01 Lj 1h If S-T-jWE- -C--H-A-NN�, 01.1, UP) LLJ A k �� j'� t)� f.t - \\`� :�YS����/i/ _.1"n•' � 3/� ��� S� ���( ....-:��_.—_ f ,� k i J,.D i�lj; 1 1-;j .�-�-`AE f I -I ti 1 J IN. �7 -f .0, I r; N f J ij. if Allen Quynn - SR 167/405 Interchange mitigation age 1 From: "Bigler, Brian S." <BiglerB@WSDOT.WA.GOV> To: "Allen Quynn (E-mail)" <aquynn@ci.renton.wa.us> Date: 1/31/01 11:01 AM Subject: SR 167/405 Interchange mitigation Allen, As I have explained, the Washington State Department of Transportation will remove several trees from the vicinity of the SR 167/405 interchange, to accommodate a flyover ramp that will connect the southbound 405 exit ramp to both north and southbound 167. The National Marine Fisheries Service has determined that removal of the poplar and cottonwood trees will result in a degradation of the riparian habitat of Rolling Hills Creek, which flows immediately adjacent to the trees. Mitigation for these trees is mandated, but is not practical at the interchange vicinity. As is standard in these instances, the removal of these trees can be mitigated by in-kind/in-basin improvements to the riparian habitat. A review of the Rolling Hills/Panther Creek Wetland/P-9/Springbrook Creek (down-gradient order of stream flow) drainage does not identify a location within the WSDOT right of way that could accommodate mitigation. WSDOT requests a partnership with the City of Renton to identify a project to improve the riparian habitat of this drainage that will fulfill our obligations under the Endangered Species Act. The SR 167/405 project will remove 13 poplar and black cottonwood trees that encompass approximately 280 m2 (3013 ft2) of property. Mitigation standards dictate that poplar or cottonwood trees be replaced by native conifers and shrubs in a similar sized area. WSDOT would appreciate consideration for any projects that the City of Renton has planned in the Panther Creek Wetla nd/P-9/S pri ng brook Creek riparian corridor that may be amenable to a cooperative agreement to accommodate our mitigation requirements. Cordially, Brian S. Bigler Fisheries Biologist Washington State Department of Transportation > *206-440-4951 > * BiglerB@WSDOT.WA.GOV CC: "Welty, Joanne" <WeltyJ@WSDOT.WA.GOV>, "Wright, Joanne" <Wrig htJ@WSDOT.WA.GOV>, "Davis, Gary" <davisg@WSDOT.WA.GOV> �Aljen Quynn atlmg address s � ' � Page 1 From: "Bigler, Brian S." <BiglerB@WSDOT.WA.GOV> To: "Allen Quynn (E-mail)" <aquynn@ci.renton.wa.us> Date: 2/2/01 10:22AM Subject: Mailing address My mailing address is: Brian S. Bigler WSDOT; MS 138 PO BOX 330310 Seattle, WA 98133-9710 Allen Quynn - Rolling Hills Mitigation Page 1 From: Allen Quynn To: Bigler, Brian Date: 2/5/01 3:59PM Subject: Rolling Hills Mitigation Dear Mr. Bigler: In response to your e-mail on 1/31/00, the City of Renton has several proposed projects in the Black River Basin which may provide mitigation opportunities for the loss of trees as result of the construction of the 1-405/SR-167 flyover. 1. Riparian Habitat Improvements- Project involves planting both sides of Springbrook Creek with native trees and shrubs to increase shade and cover for fish. The plantings would be concentrated along both banks between the average flow depth and the two year flow depth. Placement of in stream structures such as woody debris at select locations would also be included. 2. 34th St. culvert- Project consists of replacement of existing culverts at SW 34th St. which are acting as conveyance restrictions with a new box culvert. The project will include habitat improvements along the bank in the vicinity of the new culvert as well as in stream woody debris. 3. Ecosystem Restoration Study (Lower Springbrook Creek) - A collaborative effort with King County and the US Army Corps of Engineers to place large woody debris and native plantings along sections of Springbrook Creek between SW 16th St. and SW 34th St. The goal of which will be to increase the natural habitat for fish rearing and storm refuge. 4. Wetland Mitigation Bank-The City is in the process of developing a wetland mitigation bank to be used as credits for public and private impacts to existing wetlands in the City. The bank will create wetlands from upland areas adjacent to Springbrook Creek and existing wetlands south of the Boeing Long Acres Site. The created wetland adjacent to Springbrook Creek will be hydraulically connected to the channel to provide fish rearing and storm refuge habitat. 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