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M �--4�',�" ..�., ^�.:, ., .r. 11 77 ,.., ^+ ` r.r J? u Unit B Brush Pile . , r uIlli ,I., 1 I I Vertical Snag �� t e-,- + F U5 Army Corps Joint Public Notice of Engineers Seattle District +wProposal and Application for a Wetland Mitigation Bank US Army Corps of Engineers Washington Department of Ecology Regulatory Branch SEA Program Post Office Box 3755 3190 - 160" Ave. SE Public Notice Date: March 13, 2006 Seattle, Washington 98124-3755 Bellevue, WA 98008-5452 Expiration Date: April 12, 2006 Telephone (206) 764-6911 Telephone (425) 649-7181 Reference No.: 200600100 Attn: Sandra Manning, Project Manager Attn: Rebecca Ponzio, Permit Manager Name: Springbrook Mitigation Bank Interested parties are hereby notified that the U.S. Army Corps of Engineers (Corps), U.S. Environmental Protection Agency, and the Washington Department of Ecology (Ecology), are considering a proposal to construct and operate the Springbrook Wetland Mitigation Bank, in the City of Renton, King County, Washington, In addition, the Corps and Ecology hereby notify interested parties of an opportunity to comment, for permitting and water quality certification purposes, on the proposal to construct and operate the proposed 131-acre Springbrook Creek Mitigation Bank, An application has been received for a Department of the Army permit in accordance with Section 404 of the Clean Water Act for certain work described below and shown on the enclosed drawings. An application has also been filed with the Department of Ecology for a Water Quality Certification, pursuant to the requirement of Section 401 of the Clean Water Act, to certify that the project described below and shown in the enclosed drawings will comply with Sections 301, 302, 303, 306 and 307 of the Act, and complies with applicable provisions of State water pollution control laws. Pursuant to the requirements of Section 307(c) of the Federal Coastal Zone Management Act (16 U.S.C. 1451) Ecology will be reviewing the project to determine if the project is consistent with the Washington State Coastal Zone Management Program. APPLICANT- Washington State Dept. of Transportation 1-405 Project Office 600 1081" Avenue NE, Suite 405 Bellevue, Washington 98004 Attn: Allison Ray Telephone: (425) 456-8610, e-mail allison.ray@i40b.wsdot,wa.gov AGENT - Washington State Dept. of Transportation _..__ 600 1081" Avenue NE, Suite 405 Bellevue, Washington 98004 ATTN: Terry Drochak Telephone: (425) 456-8595, e-mail terry. drochak@i405.wsdot.wa,gov LOCATION - The proposed mitigation bank would be constructed at five locations (units) located in the Lower Green River Basin, within Water Resource Inventory Area 9 (WRIA 9), along Springbrook Creek in the southwest portion of the City of Renton, King County, Washington (see figure 1). The units are located in Sections 25, 30 and 36 of Township 23N, Ranges 4E and 5E, on the Willamette Meridian at the following latitudes and longitudes: Unit A - 47°27'28"N, 22°13'26"W; Unit B - 471,27'29"N, 22014'10"W; Unit C - 47027'19"N, 22014'24"W; Unit D - 47026'29"N, 22014'27"W; and Unit E - 47o26'49"N, 122o14'08"W. PROJECT DESCRIPTION - The Washington State Department of Transportation (WSDOT) and the City of Renton are working together to construct and operate a mitigation bank within five units by re-establishing, rehabilitating, and enhancing approximately 131 acres of wetland and riparian area located in Renton, King County, Washington. The Springbrook Mitigation Bank will connect Springbrook Creek to historic wetlands; increase wetland area, hydrologic functions, water quality functions, and habitat functions; and provide environmental education opportunities. The bank will be protected in perpetuity by a conservation easement. The attached drawings show the conceptual design for the proposed bank project (see figures 3-7). A more detailed description of this proposal is available in Springbrook Creek Wetland and Habitat Mitigation Bank Prospectus, dated February 21, 2006, This prospectus is available upon request at the above -listed Corps and Ecology offices. SERVICE AREA - The service area proposed for this mitigation bank would involve the following drainage basins within King County: Green River, Black River, Lake Washington, May Creek, Mill Creek, and Cedar River. Please refer to Figure 2 or the above -referenced prospectus for more detailed information on service area. PURPOSE - The purpose of Springbrook Bank is to provide high -quality, consolidated, off -site compensatory mitigation for unavoidable impacts to aquatic resources caused by WSDOT construction projects and City - approved projects that are authorized by the Corps, Ecology and other regulatory entities that occur within the service area of the bank. The use of bank credits as future compensatory mitigation would depend on case - by -case approval by the involved regulatory agencies after determining that the use of bank credits would be consistent with all applicable rules and policies of the agencies. ADDITIONAL INFORMATION - The bank sponsors will work with a multi -agency Banking Oversight Committee (BOC) to develop a mitigation banking instrument (MBi) and memorandum of agreement (MOA) in accordance with Federal Guidance for the Establishment; Use and Operation of Mitigation Banks and applicable state, local, and other federal requirements. The MBI will detail the legal and physical characteristics of the bank sites and describe how the bank would be established and operated. For additional information on mitigation banking in Washington State, please refer to the following website: http://www.ecy. wa.gov/programs/sea/wetmitig/index_html ENDANGERED SPECIES - The Endangered Species Act (ESA) of 1973, as amended, requires assessment of an action's potential impacts to listed and proposed species. The Bald eagle (Haliaeetus leucocephalus) threatened, Coastal -Puget Sound bull trout (Salvelinus confluentus) threatened, and the Puget Sound Chinook (Oncorhynchus tshawytscha) threatened, occur in the proposed project area. For Chinook salmon, critical habitat has been designated in this area. Consultation has been initiated with the US Fish and Wildlife Service and the National Marine Fisheries Service (Services). After receipt of comments from this public notice, and a decision from the Services, the U.S. Army Corps of Engineers will evaluate the potential impacts to these listed species and critical habitat. ESSENTIAL FISH HABITAT - The Magnuson -Stevens Fishery Conservation and Management Act (MSA), as amended by the Sustainable Fisheries Act of 1996, requires all Federal agencies to consult with the National Marine Fisheries Service (NMFS) on all actions, or proposed actions, permitted, funded, or undertaken by the agency, that may adversely affect Essential Fish Habitat (EFH). EFH for Pacific salmon occurs in the project area. If the Corps determines that the proposed action may adversely affect EFH for federally -managed fisheries in Washington waters, the Corps will initiate EFH consultation with the NMFS. The Corps' final determination relative to project impacts and the need for mitigation measures is subject to review by and coordination with the NMFS. CULTURAL RESOURCES - The District Engineer has reviewed the latest published version of the National Register of Historic Places, lists of properties determined eligible and other sources of information. The following is current knowledge of the presence or absence of historic properties and the effects of the undertaking upon these properties: There are no recorded historic properties within the permit areas and no sites listed, or eligible for listing, on the National Register of Historic Places are known to exist within the permit area. The District Engineer invites responses to this public notice from Native American Nations or tribal governments, Federal, State, and local agencies, historical and archeological societies, and other parties likely to have knowledge of or concerns with historic properties in the area. PUBLIC HEARING -Any person may request, in writing, within the comment period specified in this notice, that a public hearing be held to consider this application. Requests for public hearings shall state, with particularity, the reasons for holding a public hearing. EVALUATION — Development of the bank would involve the discharge of dredged and fill material into waters of the United States, which requires Department of the Army authorization under Section 404 and Department of Ecology Water Quality Certification under Section 401 of the Federal Clean Water Act. The Corps and Ecology are soliciting comments from interested parties, including the public; Federal, State, and local agencies and officials; Native American Nations or tribal governments; and other interested parties in order to identify project aspects that need to be addressed during the bank review and permitting processes and in the development of the Mitigation Bank Instrument. Public comments will assist in developing facts upon which to base a decision by MBOC member agencies as to whether or not to authorize the proposed mitigation bank. For accuracy and completeness of the record, all comments should be submitted in writing with sufficient detail to furnish a clear understanding of the reasons for that support or opposition. The Corps will evaluate this proposal pursuant to the requirements of Section 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act of 1899, and other applicable Regulatory Program requirements. Ecology will review this proposal for consistency with the Washington Coastal Zone Management Program, compliance with applicable State and Federal water quality standards pursuant to Section 401 of the Clean Water Act and consistency with the state's pilot rule for wetland mitigation bank certifications. The proposal may also require Shorelines Management Act Substantial Development authorization under review by the City of Renton, and Hydraulic Project Approval from the State of Washington. For the Corps to make this decision, comments are used to assess impacts on endangered species, historic properties, water quality, general environmental effects, and the other public interest factors listed above. Comments are used in the preparation of an Environmental Assessment and/or an Environmental Impact Statement pursuant to the National Environmental Policy Act. Comments are also used to determine the need for a public hearing and to determine the overall public interest of the activity. For Ecology to make a decision the work must be consistent with the approved Washington Coastal Zone Management Program, and comply with Section 401 of the Clean Water Act which requires compliance with the applicable State and Federal water quality standards. COMMENT AND REVIEW PERIOD — Conventional mail or e-mail comments on this public notice will be accepted and made part of the record and will be considered in determining whether it would be in the public interest to authorize this proposal. In order to be accepted, e-mail comments must originate from the author's e-mail account and must include on the subject line of the e-mail message the permit applicant's name and reference number as shown below. Both conventional mail or e-mail comments must include the permit applicant's name and reference number, as shown below, and the commenter's name, address, and phone number. All comments whether conventional mail or e-mail must reach this office, no later than the expiration date of this public notice to ensure consideration. Please include the following name and reference number: Washington State Dept. of Transportation, 200600100 Corps comments: All e-mail comments should be sent to Sandra.L.Manning@usace.army.mil. Conventional mail comments should be sent to U.S. Army Corps of Engineers, Regulatory Branch, Attn: Sandra Manning, Post Office Box 3755, Seattle, Washington, 98124-3755. Ecology Comments: Any person desiring to present views on the project pertaining to: (1) request for water quality certification under Section 401 of the Clean Water Act and/or 2) consistency with the Washington State Coastal Zone Management Program, or to provide comments on the bank's processing or operation, may do so by submitting written comments to the following address: Department of Ecology, Attn: Rebecca Ponzio, 3190 1601" Avenue Southeast, Bellevue, Washington, 98008-5452, or e-mail to rpon461 @ecy.wa.gov. Encl: Figures (8) § a""t Aate: i s '°`t$g 4, age i.q o s �dt II4 20 Hi 4 x 3 L .ob DRAINS TU UN T ga _ SPRINGBROOK PROPOSEDIRETAIN: REFERENCE #: 200600100 IN: and d wetlands APPLICANT: WSDOT NEARIAT: Renton COUNTY: King STATE: WA DATE: 02/15/06 lGRADING. HYDROLOGIC ALTERATION, AND WETLAND PLANTING INVASIVE REMOVAL AND ''� YETLAND PLANTING HYDROLOGIC ALTERATION AND CONIFER UNDERPLANTING I INVASIVE REMOVAL AND CONIFER UNDERPLANTING >-- EXISTING CONVEYANCE DITCH VERTICAL SNAG r. LOG BRUSH PILE ,.� DITCH PLUG a11n HORIZONTAL DATUM: PROJECT VERTICAL DATUM: NAVD 88 SPRINGBROOK PROPOSEDIRETAIN: REFERnENCE M: t160 [�I1fti� 100 0� IN: Streams and wetlands APPLICANT:NEARIAT: Renton COUNTY: King STATE: WA DATE: 02/15/06 UNIT D LEGEND NYQROIOGIC ALTERATIONS NVASIVE REMOVAL AND t ON IIFER UNDERPLANTING LXi;•.X�! GRADING AND WETLAND PLANTING RAILROAD TRACK EXISTING CONVEYANCE DITCH -- --- CITY LIMITS �• EXISTING TRAIL BRUSH PILE S T-•,,. )1 l [7/l10 0 100 2001 Feet HORIZONTAL DATUM: PROJECT VERTICAL DATUM: NAVD 88 STATE Of WASHINGTON DFPARTMEN'r OF FCOLOGY P.O. Box 411600 0 Olympia, Washington 98,504-7600 060) 407-6000 a TOD Only (Hearing Impaired) 0601 407.6006 STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Notice of Application for Water Quality Certification and for Certification of Consistency with the Washington Coastal Zone Management Program Date: March 13,2006 Notice is hereby given that a request has been filed with the Department of Ecology, pursuant to the requirements of Section 401 of the federal Clean Water Act of 1977 (PL 95-217), to certify that the project described in the U.S. Army Corps of Engineers Public Notice No. 200600100 will comply with the Sections 301, 302, 303, 306, and 307 of the Act, and with applicable provisions of State and Federal water pollution control laws. Notice is herby given that a request has been filed with the Department of Ecology, pursuant to the requirements of Section 307C of the Federal Coastal Zone Management Act of 1972 (16 U.S.C. 1451), to certify that the above referenced project will comply with the Washington State Coastal Zone Management Program and that the project will be conducted in a manner consistent with that program. Any person desiring to present views on the project pertaining to the project on either or both (1) compliance with water pollution control laws or (2) the project's compliance or consistency with the Washington State Coastal Zone Management Program may do so by providing written comments within 30 days of the above publication date to: Federal Pen -nit Coordinator Department of Ecology SEA Program Post Office Box 47600 Olympia, Washington 98504-7600 13 US Army Corps Joint Public Notice of Engineers Seattle District 6..� Proposal and Application for iiii-Nd . "Vowa a Wetland Mitigation Bank WASN1 lOv SIA1 O EP AAINE X' ;r ECOLOGY US Army Corps of Engineers Washington Department of Ecology Regulatory Branch SEA Program Post Office Box 3755 3190 - 160" Ave. SE Public Notice Date: March 13, 2006 Seattle, Washington 98124-3755 Bellevue, WA 98008-5452 Expiration Date: April 12, 2006 Telephone (206) 764-6911 Telephone (425) 649-7181 Reference No.: 200600100 Attn: Sandra Manning, Project Manager Attn: Rebedga Ponzio, Permit Manager Name: Springbrook Mitigation Bank Interested parties are hereby notified that the U.S. Army Corps of Engineers (Corps), U.S. Environmental Protection Agency, and the Washington Department of Ecology (Ecology), are considering a proposal to construct and operate the Springbrook Wetland Mitigation Bank, in the City of Renton, King County, Washington. In addition, the Corps and Ecology hereby notify interested parties of an opportunity to comment, for permitting and water quality certification purposes, on the proposal to construct and operate the proposed 131-acre Springbrook Creek Mitigation Bank. An application has been received for a Department of the Army permit in accordance with Section 404 of the Clean Water Act for certain work described below and shown on the enclosed drawings. An application has also been filed with the Department of Ecology for a Water Quality Certification, pursuant to the requirement of Section 401 of the Clean Water Act, to certify that the project described below and shown in the enclosed drawings will comply with Sections 301, 302, 303, 306 and 307 of the Act, and complies with applicable provisions of State water pollution control laws. Pursuant to the requirements of Section 3O7(c) of the Federal Coastal Zone Management Act (16 U.S.C. 1451) Ecology will be reviewing the project to determine if the project is consistent with the Washington State Coastal Zone Management Program. APPLICANT- Washington State Dept. of Transportation 1-405 Project Office 600 108th Avenue NE, Suite 405 Bellevue, Washington 98004 Attn: Allison Ray Telephone: (425) 456-8610, e-mail allison.ray@i405.wsdot.wa.gov AGENT - Washington State Dept. of Transportation 600 108`h Avenue NE, Suite 405 Bellevue, Washington 98004 ATTN: Terry Drochak Telephone: (425) 456-8595, e-mail terry.drochak@i4O5.wsdot.wa.gov LOCATION — The proposed mitigation bank would be constructed at five locations (units) located in the Lower Green River Basin, within Water Resource Inventory Area 9 (WRIA 9), along Springbrook Creek in the southwest portion of the City of Renton, King County, Washington (see figure 1). The units are located in Sections 25, 30 and 36 of Township 23N, Ranges 4E and 5E, on the Willamette Meridian at the following latitudes and longitudes: Unit A - 47o27'28"N, 22°13'26"W; Unit B - 47o27'29"N, 22o14110"W; Unit C 47027'19"N, 22014'24"W; Unit D - 47o26'29"N, 22o14'27"W; and Unit E - 47026'49"N, 122014'08"W. PROJECT DESCRIPTION — The Washington State Department of Transportation (WSDOT) and the City of Renton are working together to construct and operate a mitigation bank within five units by re-establishing, rehabilitating, and enhancing approximately 131 acres of wetland and riparian area located in Renton, King County, Washington. The Springbrook Mitigation Bank will connect Springbrook Creek to historic wetlands; increase wetland area, hydrologic functions, water quality functions, and habitat functions; and provide environmental education opportunities. The bank will be protected in perpetuity by a conservation easement. The attached drawings show the conceptual design for the proposed bank project (see figures 3-7). A more detailed description of this proposal is available in Springbrook Creek Wet/and and Habitat Mitigation Bank Prospectus, dated February 21, 2006. This prospectus is available upon request at the above -listed Corps and Ecology offices. SERVICE AREA — The service area proposed for this mitigation bank would involve the following drainage basins within King County: Green River, Black River, Lake Washington, May Creek, Mill Creek, and Cedar River. Please refer to Figure 2 or the above -referenced prospectus for more detailed information on service area. PURPOSE — The purpose of Springbrook Bank is to provide high -quality, consolidated, off -site compensatory mitigation for unavoidable impacts to aquatic resources caused by WSDOT construction projects and City - approved projects that are authorized by the Corps, Ecology and other regulatory entities that occur within the service area of the bank. The use of bank credits as future compensatory mitigation would depend on case - by -case approval by the involved regulatory agencies after determining that the use of bank credits would be consistent with all applicable rules and policies of the agencies. ADDITIONAL INFORMATION — The bank sponsors will work with a multi -agency Banking Oversight Committee (BOC) to develop a mitigation banking instrument (MBI) and memorandum of agreement (MOA) in accordance with Federal Guidance for the Establishment, Use and Operation of Mitigation Banks and applicable state, local, and other federal requirements. The MBI will detail the legal and physical characteristics of the bank sites and describe how the bank would be established and operated. For additional information on mitigation banking in Washington State, please refer to the following website: http://www.ecy.wa.gov/programs/sea/wetmitig/index.htmi ENDANGERED SPECIES - The Endangered Species Act (ESA) of 1973, as amended, requires assessment of an action's potential impacts to listed and proposed species. The Bald eagle (Haliaeetus leucocephalus) threatened, Coastal -Puget Sound bull trout (Salvelinus confluentus) threatened, and the Puget Sound Chinook (Oncorhynchus tshawytscha) threatened, occur in the proposed project area. For Chinook salmon, critical habitat has been designated in this area. Consultation has been initiated with the US Fish and Wildlife Service and the National Marine Fisheries Service (Services). After receipt of comments from this public notice, and a decision from the Services, the U.S. Army Corps of Engineers will evaluate the potential impacts to these listed species and critical habitat. ESSENTIAL FISH HABITAT - The Magnuson -Stevens Fishery Conservation and Management Act (MSA), as amended by the Sustainable Fisheries Act of 1996, requires all Federal agencies to consult with the National Marine Fisheries Service (NMFS) on all actions, or proposed actions, permitted, funded, or undertaken by the agency, that may adversely affect Essential Fish Habitat (EFH). EFH for Pacific salmon occurs in the project area. If the Corps determines that the proposed action may adversely affect EFH for federally -managed fisheries in Washington waters, the Corps will initiate EFH consultation with the NMFS. The Corps' final determination relative to project impacts and the need for mitigation measures is subject to review by and coordination with the NMFS. CULTURAL RESOURCES - The District Engineer has reviewed the latest published version of the National Register of Historic Places, lists of properties determined eligible and other sources of information. The following is current knowledge of the presence or absence of historic properties and the effects of the undertaking upon these properties: There are no recorded historic properties within the permit areas and no sites listed, or eligible for listing, on the National Register of Historic Places are known to exist within the permit area. The District Engineer invites responses to this public notice from Native American Nations or tribal governments, Federal, State, and local agencies, historical and archeological societies, and other parties likely to have knowledge of or concerns with historic properties in the area. PUBLIC HEARING -Any person may request, in writing, within the comment period specified in this notice, that a public hearing be held to consider this application. Requests for public hearings shall state, with particularity, the reasons for holding a public hearing. EVALUATION — Development of the bank would involve the discharge of dredged and fill material into waters of the United States, which requires Department of the Army authorization under Section 404 and Department of Ecology Water Quality Certification under Section 401 of the Federal Clean Water Act. The Corps and Ecology are soliciting comments from interested parties, including the public; Federal, State, and local agencies and officials; Native American Nations or tribal governments; and other interested parties in order to identify project aspects that need to be addressed during the bank review and permitting processes and in the deve!opment of the Mitigation Bank Instrument. Public comments will assist in developing facts upon which to base a decision by MBOC member agencies as to whether or not to authorize the proposed mitigation bank. For accuracy and completeness of the record, all comments should be submitted in writing with sufficient detail to furnish a clear understanding of the reasons for that support or opposition. The Corps will evaluate this proposal pursuant to the requirements of Section 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act of 1899, and other applicable Regulatory Program requirements. Ecology will review this proposal for consistency with the Washington Coastal Zone Management Program, compliance with applicable State and Federal water quality standards pursuant to Section 401 of the Clean Water Act and consistency with the state's pilot rule for wetland mitigation bank certifications. The proposal may also require Shorelines Management Act Substantial Development authorization under review by the City of Renton, and Hydraulic Project Approval from the State of Washington. For the Corps to make this decision, comments are used to assess impacts on endangered species, historic properties, water quality, general environmental effects, and the other public interest factors listed above. Comments are used in the preparation of an Environmental Assessment and/or an Environmental Impact Statement pursuant to the National Environmental Policy Act. Comments are also used to determine the need for a public hearing and to determine the overall public interest of the activity. For Ecology to make a decision the work must be consistent with the approved Washington Coastal Zone Management Program, and comply with Section 401 of the Clean Water Act which requires compliance with the applicable State and Federal water quality standards. COMMENT AND REVIEW PERIOD — Conventional mail or e-mail comments on this public notice will be accepted and made part of the record and will be considered in determining whether it would be in the public interest to authorize this proposal. In order to be accepted, e-mail comments must originate from the author's e-mail account and must include on the subject line of the e-mail message the permit applicant's name and reference number as shown below. Both conventional mail or e-mail comments must include the permit applicant's name and reference number, as shown below, and the commenter's name, address, and phone number. All comments whether conventional mail or e-mail must reach this office, no later than the expiration date of this public notice to ensure consideration. Please include the following name and reference number: Washington State Dept. of Transportation, 200600100 Corps comments: All e-mail comments should be sent to Sandra.L.Manning@usace.army.mil. Conventional mail comments should be sent to U.S. Army Corps of Engineers, Regulatory Branch, Attn: Sandra Manning, Post Office Box 3755, Seattle, Washington, 98124-3755. Ecology Comments: Any person desiring to present views on the project pertaining to: (1) request for water quality certification under Section 401 of the Clean Water Act and/or 2) consistency with the Washington State Coastal Zone Management Program, or to provide comments on the bank's processing or operation, may do so by submitting written comments to the following address: Department of Ecology, Attn: Rebecca Ponzio, 3190 160" Avenue Southeast, Bellevue, Washington, 98008-5452, or e-mail to rpon461 @ecy.wa.gov. Encl: Figures (8) G7�i7i�F�f,d:8£i R�� x PURPOSE: Wetland Mitigation V O Legend Unit +^- Springbrook Creek Other Wetland ® Mitigation Sites L ae •,, Wetlan s i AXE esdle'hase fl 4 av a y p � } ibn nakesdale: usne Y f ' SPRINGBROOK PROPOSED/RETAIN: N o soo �,000 W E REFERENCE*: s Feet IN:200600100 NEAR: Renton APPLICANT: WSDOT COUNTY: King STATE: WA DATE: 2/15/2006 HORIZONTAL DATUM: PROJECT VERTICAL DATUM: NAD 83 FIGURE 1. PROJECT VICINITY Cedar-Sammamis 4 900 _ s x t#^s N q f' t• {` ` E 515 m ( 167 y Green DUWamIS atershed (WRIA) �'�' It PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSED/RETAIN: PHOTO DATE: 2002 (King County) REFERENCE #: 200600100 NEAR: Renton Figure 2 COUNTY: King STATE: WA Service Area APPLICANT: WSDOT DATE:2/15/2006 Legend WRIA Boundary QService Area Q Springbrook Bank City of Renton River Freeway Arterial N 0 1 2 W E 8 Miles HORIZONTAL DATUM: PROJECTI VERTICAL DATUM: NAD 83 loop I «l Ftf41Y�t"° yy�A4�^LL'qsi��'�YT,Y9'�g6�',LYA`.5�y!Adg96�,��,�96M2p`'f,'T,y��p� '�''4"�_�"�(�Ok•��5 �1��pl[q{,. - ��9�Y�*�I®`�,`W��i' s";,� Aa �'��t �P ,y � T • x� i� yWE M,q�:��'. T i" 'N ®� ' �� . � `, `��a//�q, Af` ,R � MyO�cn ME- Yom nwo i ! ONE. Al! Al! : 5TA 4. i STATE OF WASHINGTON DEPARTMENT CAE ECOLOGY RO, Box 47600 ® Olympia, Washington 98504-7600 (360) 407-6000 ® TDD Only (flearing Impaired) (360) 407-6006 STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Notice of Application for Water Quality Certification and for Certification of Consistency with the Washington Coastal Zone Management Program Date: March 13, 2006 Notice is hereby given that a request has been filed with the Department of Ecology, pursuant to the requirements of Section 401 of the federal Clean Water Act of 1977 (PL 95-217), to certify that the project described in the U.S. Army Corps of Engineers Public Notice No. 200600100 will comply with the Sections 301, 302, 303, 306, and 307 of the Act, and with applicable provisions of State and Federal water pollution control laws. Notice is herby given that a request has been filed with the Department of Ecology, pursuant to the requirements of Section 307© of the Federal Coastal Zone Management Act of 1972 (16 U.S.C. 1451), to certify that the above referenced project will comply with the Washington State Coastal Zone Management Program and that the project will be conducted in a manner consistent with that program. Any person desiring to present views on the project pertaining to the project on either or both (1) compliance with water pollution control laws or (2) the project's compliance or consistency with the Washington State Coastal Zone Management Program may do so by providing written comments within 30 days of the above publication date to: Federal Permit Coordinator Department of Ecology SEA Program Post Office Box 47600 Olympia, Washington 98504-7600 13 sVti_ ; LSAs anon tgO1N38 3O A-00 soot 5 t 8VN 13a48 bZ L 8 6 3000dIZ WO21:j agiim 900Z £ L dVIN so£99£b000 OCT 00 $ d L z o 5IMO9 A3Nlld Z �Z'b1SOd1�y5 99026 VAA NO1N�RJ n AAA AGVb JJ S 550 t- ��,� N01N321 JO /kilo a31S3n03H 301AN3S Nun1321 SS3NIS(18l` ou=i0 SSLE-t,M6 VM `3111b'3S SSLE XOS 'O'd (0) %1-QO-SMN30 S2133NIJN3 30 S&I00 `101211S1a 311IV3S JlMW 3H130 1N31N1NVd3® AGENCY USE ONLY Agency Reference #: Date Received: Circulated by: (local govt. or agency) JOINT AQUATIC RESOURCES PERMIT APPLICATION FORM (JARPA) (for use in Washington State) PLEASE TYPE OR PRINT IN BLACK INK. TO FILL IN ELECTRONIC L `V, USE F 1 TO MOVE THROUGH THE FORM ❑ Application for a Fish Habitat Enhancement Project per requirements of RCW 77.55.290. You must submit a copy of this completed JARPA application form and the (Fish Habitat Enhancement JARPA Addition) to your local Government Planning Department and Washington Department of Fish & Wildlife Area Habitat Biologist on the same day. NOTE: LOCAL GOVERNMENTS — You must submit any comments on these projects to WDFW within 15 working days. Based on the instructions provided, I am sending copies of this application to the following: (check all that apply) ❑x Local Government for shoreline: ❑x Substantial Development ❑Conditional Use ❑Variance [-]Exemption ❑Revision ❑x Floodplain Management ❑x Critical Areas Ordinance ❑x Washington Department of Fish and Wildlife for HPA (Submit 3 copies to WDFW Region) ❑x Washington Department of Ecology for 401 Water Quality Certification (to Regional Office -Federal Permit Unit) ❑ Washington Department of Natural Resources for Aquatic Resources Use Authorization Notification ❑x Corps of Engineers for: ❑x Section 404 ❑ Section 10 permit ❑ Coast Guard for: ❑ General Bridge Act Permit ❑ Private Aids to Navigation (for non -bridge projects) ❑x For Department of Transportation projects only: This project will be designed to meet conditions of the most current Ecology/Department of Transportation Water Quality Implementing Agreement SECTION A - Use for all permits covered by this application. Be sure to ALSO complete Section C (Signature Block) for all permit applications. 1. APPLICANT Allison Ray, Washington State Department of Transportation (WSDOT), Interstate 405 (1-405) Congestion Relief and Bus Rapid Transit Projects—Springbrook Creek Wetland and Habitat Mitigation Bank Project. MAILING ADDRESS 1-405 Project Office, 600 108th Avenue NE, Suite 405, Bellevue, Washington, 98004 WORK PHONE E-MAIL ADDRESS HOME PHONE FAX # (425) 456-8500 allison.ray@i405.wsdot.wa.gov 1 (425) 456-8600 if an agent is acting for the applicant during the permit process, complete #2. Be sure agent signs Section C (Signature Block) for all permit applications 2. AUTHORIZED AGENT Terry Drochak, Permit Specialist MAILING ADDRESS 1-405 Project Office, 600 108th Avenue NE, Suite 405, Bellevue, Washington, 98004 WORK PHONE E-MAIL ADDRESS HOME PHONE FAX # (425) 456-8595 terry.drochak@i405.wsdot.wa.gov (425) 456-8600 3. Relationship of applicant to property: ❑ OWNER ❑ PURCHASER ❑ LESSEE Other 4. Name, address and phone number of property owner(s) if other than applicant: City of Renton, 1055 S. Grady Way, Renton, WA 98055, (425) 430-7321 5. Location (street address, including city, county and zip code, where proposed activity exists or will occur) The proposed Springbrook Creek Wetland and Habitat Mitigation Bank (Springbrook Bank) site consists of five land parcels (Units A through E), totaling 131.54 acres. The Springbrook Bank site is located south of SW 27th Street and west of Lind Avenue SW in the City of Renton. See Attachment A — JARPA Drawings, sheets V1 and T1. Specific locations are as follows: • Unit A is located immediately south of SW 27th Street, immediately north of developed commercial shipping/warehouse facilities, immediately west of Lind Avenue, and immediately east of and adjacent to Springbrook Creek. The undeveloped site covers 26.33 acres. • Unit B is located immediately south of SW 27th Street, immediately north of developed commercial shipping/warehouse facilities, immediately west of and adjacent to Springbrook Creek, and immediately east of Oakesdale Avenue SW. The undeveloped site covers 36.49 acres. • Unit C is located immediately south of undeveloped land, immediately north of a developed industrial shipping/railroad facility and undeveloped land, immediately west of Oakesdale Avenue SW, and immediately east of an active Burlington Northern Santa Fe (BNSF) Railroad right-of-way. The undeveloped site covers 47.90 acres. • Unit D is located immediately south of undeveloped land, immediately north of SW 43rd Street, immediately east of an active BNSF Railroad right-of-way, and immediately west of a developed commercial shipping/warehouse facility. The undeveloped site covers 5.60 acres. • Unit E is located immediately south of developed commercial shipping/warehouse facilities, immediately north and west and adjacent to Springbrook Creek, and immediately east of Oakesdale Avenue SW. The undeveloped site covers 15.22 acres. Local government with jurisdiction (city or county): City of Renton Waterbody you are working in: Tributary of: WRIA #: Springbrook Creek Green River 9 Shoreline designation: Is this waterbody on the 303(d) List'" YES �x NO ❑ If YES, what parameter(s)? Springbrook Creek: Urban Environment Sediment Bioassay, Chromium, Dissolved Oxygen, Fecal Associated Wetlands: Conservancy Environment Zoning designation: Coliform, Mercury, Temperature, Zinc, Copper, Cadmium "For 303d List, Units A, B, C, and E: Resource Conservation (RC) http://www.ecy.wa.gov/programs/wg/303d/index.htmi Unit D: Industrial Medium IM % Section Township Range Government Lot Section Unit A: 30 23N 5E DNR stream type if known: Unit B: 25 23N 4E Springbrook Creek: DNR Type F Unit C: 25 23N 4E Unit D: 36 23N 4E Unit E: 25 23N 4E Tax Parcel Number: Latitude and Longitude: Unit A: 125381-0090 Unit A: Lat. 47°27'28" Long.-122'13'26" Unit B: 252304-9004 (NE portion), 125381-0170, and 125381- Unit B: Lat. 47°27'29" Long.-122°14'10" 0230 Unit C: Lat. 47°27'19" Long.-122°14'24" Unit C: 252304-9004 (portion located west of Oakesdale Unit D: Lat. 47°26'29" Long.-122°14'27" Avenue SW) and 252304-9019 Unit E: Lat. 47°26'49" Long.-122°14'08" Unit D: 362304-9002 (northerly 600 feet) Unit E: 125381-0240 6. Describe the current use of the property, and structures existing on the property. Have you completed any portion of the proposed activity on this property? ❑ YES Ox NO For any portion of the proposed activity already completed on this property, indicate month and year of completion. The current use of the Springbrook Bank site is undeveloped land. No building structures currently exist on the site. Is the property agricultural land? ❑ YES 0 NO Are you a USDA program participant? ❑ YES �x NO 7a. Describe the proposed work that needs aquatic permits: Complete plans and specifications should be provided for all work waterward of the ordinary high water mark or line, including types of equipment to be used. If applying for a shoreline permit, describe all work within and beyond 200 feet of the ordinary high water mark. If you have provided attached materials to describe your project, you still must summarize the proposed work here. Attach a separate sheet if additional space is needed. The Springbrook Bank project proposes to increase wetland area; improve hydrologic functions, water quality functions, habitat functions, fish refuge/rearing habitat; and provide passive environmental education opportunities. The Springbrook Bank will re-establish 17.81 acres of wetland, rehabilitate 52.92 acres of wetland, enhance 33.61 acres of wetland, enhance 7.80 acres of upland, and enhance 6.88 acres of riparian upland adjacent to Springbrook Creek. The project alsc proposes to establish a 40-foot-wide protection setback (buffer) by enhancing 9.86 acres of perimeter area on portions of all units, except Unit D. In addition, the project proposes to construct an elevated boardwalk trail across Unit A, thereby connecting the King County regional Interurban Trail to the King County regional Green River Trail. The timing of work elements is described below and in question 8 of this JARPA. See Attachment B — Draft Mitigation Bank Instrument for a more detailed description of the overall site restoration strategy Unit A The work elements proposed on Unit A are wetland rehabilitation (20.30 acres), wetland re-establishment (0.05 acres), riparian upland enhancement (0.65 acres, protection setback (buffer) establishment (2.67 acres), and construction of an elevated boardwalk trail and adjacent vegetation enhancement within the trail zone (2.66 acres). A total of 12.4 acres of surface area is proposed to be disturbed (i.e., cleared, grubbed, or graded) on Unit A during construction. Site Preparation: Initially, high visibility fencing will be installed around the perimeter of the site and around the perimeter of all proposed work areas to prevent equipment intrusion into areas where no work is proposed. In addition, silt fencing will be installed alongside the entire length of Springbrook Creek and along the perimeter of all proposed clearing, grubbing, and grading areas to prevent turbid water from entering Springbrook Creek and adjacent areas where no work is proposed. A temporary construction entrance and tire wash area will be installed at the northwest corner of Unit A. The construction entrance will be constructed using geotextile fabric topped with 4- to 8-inch quarry spalls. The tire wash water will be discharged to a Baker tank and then either hauled off or discharged into a sanitary sewer. The exact method of removal will be determined by the contractor. Pa is ,,e,tP +o 0� -wJh) ,,1 In specific areas, existing reed canarygrass will be mowed immediately above the ground surface using small to medium sized grass -cutting equipment and removed from the site. Mowing will occur in June/July before seeds are formed on the plant stalks. During the dry periods of both August and September, the cut areas will be sprayed with glyphosate (Rodeo®) herbicide to control below ground roots and rhizomes. In other specifically prescribed areas, such as the earthen berm breach locations and the elevated boardwalk trail location, the surface vegetation will be cleared and grubbed to accommodate subsequent grading and boardwalk construction. For more information, see Attachment A — JARPA Drawings, sheet SP1; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Grading: During the dry weather season, the existing earthen berm along the eastern edge of Springbrook Creek will be breached in three locations in order to reconnect Springbrook Creek with its historic floodplain. The breaches, which will be excavated using hydraulic excavators (i.e., backhoe), will measure 20 feet wide and approximately 2 to 3 feet deep to match the ground elevation of the adjacent wetland surface. Maximum side slope of the breaches will be 3:1 (horizontal tc vertical). Disturbed soil areas near Springbrook Creek will be protected with coir or jute fabric to prevent erosion. All excavated material will be removed from the site and disposed at a WSDOT-approved upland site. The exact location of the disposal site will be determined by the contractor. Approximately three habitat structures (vertical snags, brush piles and/or large woody debris) per acre and two planting 4urfrn+esks per acre will be installed in reed canarygrass removal and treatment areas. Habitat structures andtkrufflff►eek-s will be installed using a combination of a hydraulic excavator and hand tools. An 8-foot-wide elevated boardwalk trail will also be constructed approximately 3 feet above the existing ground surface elevation. The trail will be built using a combination of both wood and recycled plastic lumber. The elevated boardwalk trail will be supported by precast concrete pin foundations. The trail will be constructed in place using small "bobcat" tractor and fence post driver. All trail construction work will be contained within the previously cleared and grubbed 18- foot-wide temporary trail construction corridor. For more information, see Attachment A — JARPA Drawings, sheet GR1; Attachment B — Draft Mitigation Bank Instrument chapter 2; and Attachment C - 60% Design Plans Planting: During the wet weather season, a density of 3,000 native trees and shrubs per acre will be installed within planting areas. Species to be planted within each planting area (e.g., wetland enhancement area, wetland rehabilitation area, riparian upland enhancement area, upland buffer habitat enhancement area, and elevated boardwalk trail zone enhancement area) have been selected for the hydrologic regime specific to that location. Any soils disturbed during planting will be covered with a minimum of 3 inches of woody mulch to minimize erosion and control weed growth. For more information, see Attachment A - JARPA Drawings, sheet P1; Attachment B - Draft Mitigation Bank Instrument, chapter 2; and Attachment C - 60% Design Plans. Unit B The work elements proposed on Unit B are wetland rehabilitation (31.43 acres), wetland re-establishment (0.12 acres), riparian upland enhancement (1.49 acres), and protection setback (buffer) establishment (3.45 acres). A total of 8.7 acres of surface area is proposed to be disturbed (i.e., cleared, grubbed, or graded) on Unit B during construction. Site Preparation: Initially, high visibility fencing will be installed around the perimeter of the site and around the perimeter of all proposed work areas to prevent equipment intrusion into areas where no work is proposed. In addition, silt fencing will be installed alongside the entire length of Springbrook Creek and along the perimeter of all proposed clearing, grubbing, and grading areas to prevent turbid water from entering Springbrook Creek and adjacent areas where no work is proposed. A temporary construction entrance and tire wash area will be installed at the northeast corner of Unit B. The construction entrance will be constructed using geotextile fabric topped with 4- to 8-inch quarry spalls. The tire wash water will be discharged to a Baker tank and then either hauled off or discharged into a sanitary sewer. The exact method of removal will be determined by the contractor. In specific areas, existing reed canarygrass will be mowed immediately above the ground surface using small to medium sized grass -cutting equipment and removed from the site. Mowing will occur in June/July before seeds are formed on the plant stalks. During the dry periods of both August and September, the cut areas will be sprayed with glyphosate (Rodeo®) herbicide to control below ground roots and rhizomes. In other specifically prescribed areas, such as the earthen berm breach locations, the surface vegetation will be cleared and grubbed to accommodate subsequent grading and boardwalk construction. For more information, see Attachment A - JARPA Drawings, sheet SP2; Attachment B - Draft Mitigation Bank Instrument, chapter 2; and Attachment C - 60% Design Plans. uU� 9 I-fVb� �/-r� L+�' �1 �[ /r�V'c Grading: During the dry weather season, the existing earthen berm along the western edge of Springbrook Creek will be � reached in four locations in order to reconnect Springbrook Creek with it's historic floodplain. The breaches, which will be lex�vated using hydraulic excavators (i.e., backhoe, etc.), will measure 20 feet wide and approximately 2 to 3 feet deep tc match the ground elevation of the adjacent wetland surface. Maximum side slope of the breaches will be 3:1 (horizontal t( vertical). Disturbed soil areas near Springbrook Creek will be protected with coir or jute fabric to prevent erosion. All excavated material will be removed from the site and disposed at a WSDOT-approved upland site. The exact location of the disposal site will be determined by the contractor. Approximately three habitat structures (vertical snags, brush piles, and/or large woody debris) per acre and tw@-ple" 4 per acre will be installed in reed canarygrass removal and treatment areas. Habitat structures and-bAwmwWk-9 will be installed using a combination of a hydraulic excavator and hand tools. i;�-,L. ,,,,,- h,,,,,; For more information, see Attachment A - JARPA Drawings, sheet GR2; Attachment B - Draft Mitigation Bank Instrument chapter 2; and Attachment C - 60% Design Plans. Planting: During the wet weather season, a density of 3,000 native trees and shrubs per acre will be installed within planting areas. Species to be planted within each planting area (e.g., wetland enhancement area, wetland rehabilitation area, riparian upland enhancement area, and upland buffer habitat enhancement area) have been selected for the hydrologic regime specific to that location. Any soils disturbed during planting will be covered with a minimum of 3 inches c woody mulch to minimize erosion and control weed growth. For more information, see Attachment A — JARPA Drawings, sheet P2; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Unit C The work elements proposed on Unit C are wetland rehabilitation (1.19 acres), wetland re-establishment (9.27 acres), forested wetland enhancement (23.32 acres), Type I wetland enhancement (4.69 acres), upland habitat enhancement (7.80 acres), and protection setback (buffer) establishment (1.63 acres). A total of 25.7 acres of surface area is proposed to be disturbed (i.e., cleared, grubbed, or graded) on Unit C during construction. Site Preparation. Initially, high visibility fencing will be installed around the perimeter of all proposed work areas to prevent equipment intrusion into areas where no work is proposed. In addition, silt fencing will be installed along the perimeter of all proposed clearing, grubbing, and grading areas to prevent turbid water from entering adjacent areas where no work is proposed. A temporary construction entrance and tire wash area will be installed at the east end of Unit C. The construction entrance will be constructed using geotextile fabric topped with 4- to-8 inch quarry spalls. The tire wash water will be discharged to a Baker tank and then either hauled off or discharged into a sanitary sewer. The exact method of removal will be determined by the contractor. In specific areas, existing reed canarygrass will be mowed immediately above the ground surface using small to medium sized grass -cutting equipment and removed from the site. Mowing will occur in June/July before seeds are formed on the plant stalks. During the dry periods of both August and September, the cut areas will be sprayed with glyphosate (Rodeo®) herbicide to control below ground roots and rhizomes. In other specifically prescribed areas, the surface vegetation will be cleared and grubbed to remove other invasive plant species (i.e., Himalayan blackberry) or to accommodate subsequent fill removal and grading. Large woody vegetation removed during clearing will be re -used as habitat structures elsewhere on the Springbrook Bank site. For more information, see Attachment A — JARPA Drawings, sheets SP3 and SP4; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Grading: During the dry weather season, approximately 100,000 cubic yards of fill will be excavated from areas that were formerly wetlands. Excavation depths range from a few inches to 7 feet depending on the location. Maximum side slope within the excavation area will be 4:1 (horizontal to vertical). Excavation and removal will be conducted using hydraulic excavators, heavy trucks, and other similar excavation equipment. All excavated material will be removed from the site and disposed at a WSDOT-approved upland site. The exact location of the disposal site will be determined by the contractor. Once the excavation is completed, the area will be rough graded to provide microtopographic variation. Recently excavated surface areas will receive a minimum of 3 inches of organic compost material. An adjustable -height weir will be installed at the outflow portion of the excavation area to impound surface hydrology to ensure wetland soil surface saturation and up to 2 inches of seasonal inundation at a surfacQ elevation of 16.2 feet. The adjustable -height weir will be constructed in place using reinforced cast -in -place concrete`'aluminum stop logs materials and a hydraulic excavator, a truck, and hand tools. SupPott- S4vvcbn v .. The existing conveyance ditch located on site will be plugged with clean fill material at regular spatial intervals so that it no longer conveys water flow (e.g., it will no longer drain the wetland). The height of the ditch plugs will match the surface elevations on either side of the existing ditch. Maximum side slope of the ditch plugs will be 3:1 (horizontal to vertical). Hydraulic excavators and similar equipment will be used to install the ditch plugs. Approximately three habitat structures (vertical snags, brush piles, and/or large woody debris) per acre and two planting hummocks per acre will be installed in reed canarygrass removal and treatment areas. Habitat structures and hummocks will be installed using a combination of a hydraulic excavator and hand tools. For more information, see Attachment A — JARPA Drawings, sheets GR3 and GR4; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Planting: During the wet weather season, a density of 3,000 native trees and shrubs per acre will be installed within most planting areas, with the exception being that planting density will be 90 trees per acre in the forested wetland under - planting enhancement area. Species to be planted within most planting areas (e.g., wetland re-establishment area, wetland rehabilitation area, Type I wetland enhancement area, upland and upland buffer habitat enhancement area, and forested wetland under -planting enhancement area) have been selected for the hydrologic regime specific to that location. Any soils disturbed during planting will be covered with a minimum of 3 inches of woody mulch to minimize erosion and control weed growth. For more information, see Attachment A — JARPA Drawings, sheets P3 and P4; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Unit D The work elements proposed on Unit D are forested wetland enhancement (2.97 acres) and Type 11 wetland enhancement (4.69 acres). A total of 0.9 acre of surface area is proposed to be disturbed (i.e., cleared, grubbed, or graded) on Unit D during construction. Site Preparation: Initially, high visibility fencing will be installed around the perimeter of all proposed work areas to prevent equipment intrusion into areas where no work is proposed. In addition, silt fencing will be installed along the perimeter of all proposed clearing, grubbing and grading areas to prevent turbid water from entering adjacent areas where no work is proposed. A temporary construction entrance and tire wash area will be installed at the southeast corner of Unit D. The construction entrance will be constructed using geotextile fabric topped with 4- to 8-inch quarry spalls. The tire wash water will be discharged to a Baker tank and then either hauled off or discharged into a sanitary sewer. The exact method of removal will be determined by the contractor. In a specific area, the surface vegetation will be cleared and grubbed to remove other invasive plant species (i.e., Himalayan blackberry) and to accommodate subsequent installation of a drainage conveyance pipe. Large woody vegetation removed during clearing will be re -used as habitat structures elsewhere on the Springbrook Bank site. For more information, see Attachment A — JARPA Drawings, sheet SP5; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Grading: All grading on Unit D will occur in the dry weather season. To enhance wetlands on site, a drainage conveyance pipe will be installed on Unit D. This conveyance pipe will convey approximately 45,000 cubic feet of additional surface hydrology per month to wetlands on the north end of Unit D from an existing stormwater treatment/detention facility located at the south end of Unit D. The existing stormwater treatment/detention pond currently discharges into the existing city stormwater conveyance system under SW 43rd Street, which eventually discharges directly into Springbrook Creek. The drainage conveyance pipe will originate at the existing stormwater treatment/detention pond control structure at the south end of Unit D and be installed under an existing gravel roadbed prior to entering the wetland at the north end of Unit D. The conveyance pipe will be buried several feet under the wetland surface until daylighting at the discharge location — approximately 200 feet inside the wetland boundary. A quarry spall flow dissipation pad will be installed at the downstream end of the conveyance pipe to prevent erosion. n, ,,_,. I „ i �.% w r P �* �r P e ? 1� i;� Excavation depths within the wetland for drainai-jic onveyance pipe installation may be up to several feet, depending on the location. Excavation, pipe installation, andremoval will be conducted using hydraulic excavators, trucks, and other similar excavation equipment. All a cavated materii will be removed from the site and disposed at a WSDOT-approved upland site. The exact location of the -disposal -sits will be determined by the contractor. Habitat brush piles will be installed in this area once the drainage conveyance pipe has been installed. The habitat brush piles will be installed using a hydraulic excavator and hand tools. For more information, see Attachment A — JARPA Drawings, sheet GR5; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. Planting: During the wet weather season, a density of 90 trees per acre will be installed within the forested wetland under - planting enhancement area. Species to be planted within this planting area have been selected for the hydrologic regime specific to that location. For more information, see Attachment A — JARPA Drawings, sheet P5; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans Unit E The work elements proposed on Unit E are wetland re-establishment (8.37 acres), riparian upland enhancement (4.74 acres), and protection setback (buffer) establishment (2.11 acres). A total of 13.5 acres of surface area is proposed to be disturbed (i.e., cleared, grubbed, or graded) on Unit E during construction. Site Preparation: Initially, high visibility fencing will be installed around the perimeter of the site and around the perimeter of all proposed work areas to prevent equipment intrusion into areas where no work is proposed. In addition, silt fencing will be installed alongside the entire length of Springbrook Creek and along the perimeter of all proposed clearing, grubbing, and grading areas to prevent turbid water from entering Springbrook Creek and adjacent areas where no work is proposed. A temporary construction entrance and tire wash area will be installed at the northwest corner of Unit E. The construction entrance will be constructed using geotextile fabric topped with 4- to 8-inch quarry spalls. The tire wash water will be discharged to a Baker tank and then either hauled off or discharged into a sanitary sewer. The exact method of removal will be determined by the contractor. In most of Unit E, the surface vegetation will be cleared and grubbed to accommodate subsequent fill removal and gradinc In a few selective areas, only invasive and non-native vegetation (i.e., Himalayan blackberry) will be cleared and grubbed to accommodate subsequent native vegetation plantings. Large woody vegetation removed during clearing will be re-usec as habitat structures elsewhere on the Springbrook Bank site. For more information, see Attachment A — JARPA Drawings, sheet SP6; Attachment B — Draft Mitigation Bank Instrument chapter 2; and Attachment C — 60% Design Plans. Grading. During the dry weather season, approximately 162,000 cubic yards of fill will be excavated from areas that were formerly wetlands. Excavation depths range from a few inches to approximately 12 feet depending on the location. Maximum side slope with the excavation area will be 3:1 (horizontal to vertical). Excavation and removal will be conducte using hydraulic excavators, heavy trucks, and other similar excavation equipment. All excavated material will be removed from the site and disposed at a WSDOT-approved upland site. The exact location of the disposal site will be determined by the contractor. Once the excavation is completed, the area will be rough graded to provide microtopographic variation. Recently excavated surface areas will receive a minimum of 3 inches of organic compost material. All disturbed soils will be covere with a minimum of 3 inches of woody mulch to deter reed canarygrass growth and promote native woody plant establishment. Disturbed soil areas near Springbrook Creek will be protected with coir or jute fabric to prevent erosion. As part of the site excavation, the earthen berm adjacent to Springbrook Creek will be breached in three locations on Unit E, allowing seasonal flood events from Springbrook Creek to penetrate much of Unit E. The breaches, which will be excavated using hydraulic excavators (i.e., backhoe) and large trucks, will range in measurement from 20 feet wide to nearly 100 feet wide and approximately 12 feet deep to aground elevation of approximately 8 feet. Maximum side slope( the breaches will be 3:1 (horizontal to vertical). Low flow channels will be graded into the interior portions of Unit E to alto, fish to migrate out of Unit E to Springbrook Creek once seasonal flood waters recede. Approximately three habitat structures (vertical snags, brush piles, and/or large woody debris) per acre will be installed in the wetland re-establishment area. Habitat structures will be installed using a combination of a hydraulic excavator and hand tools. For more information, see Attachment A — JARPA Drawings, sheet GR6; Attachment B — Draft Mitigation Bank Instrument chapter 2; and Attachment C — 60% Design Plans. Planting: During the wet weather season, a density of 3,000 native trees and shrubs per acre will be installed within most planting areas, with the exception being that planting density will be 90 trees per acre in the upland underplanting enhancement areas. Species to be planted within most planting areas (e.g., wetland re-establishment area, riparian upland enhancement area, and upland buffer habitat enhancement area) have been selected for the hydrologic regime specific to that location. Any soils disturbed during planting will be covered with a minimum of 3 inches of woody mulch to minimize erosion and control weed growth. For more information, see Attachment A — JARPA Drawings, sheet P6; Attachment B — Draft Mitigation Bank Instrument, chapter 2; and Attachment C — 60% Design Plans. PREPARATION OF DRAWINGS: See sample drawings and guidance for completing the drawings. ONE SET OF ORIGINAL OR GOOD QUALITY REPRODUCIBLE DRAWINGS MUST BE ATTACHED. NOTE: Applicants are encouraged to submit photographs of the project site, but these DO NOT substitute for drawings. THE CORPS OF ENGINEERS AND COAST GUARD REQUIRE DRAWINGS ON 8-112 X 11 INCH SHEETS. LARGER DRAWINGS MAYBE REQUIRED BY OTHER AGENCIES. 7b. Describe the purpose of the proposed work and why you want or need to perform it at the site. Please explain any specific needs that have influenced the design. The purpose of the Springbrook Bank is to provide compensatory mitigation credits for future unavoidable impacts to wetlands and similar resources caused by WSDOT highway construction projects and other projects permitted by the City of Renton within the service area of the bank. The proposed project focuses on improving wetland area and function and riparian functions near Springbrook Creek. Construction work includes extensive site grading on Units C and E; breaching the earthen berms adjacent to Springbrook Creek on Units A, B, and E; removing and controlling invasive reed canarygrass in Units A, B, and C; constructing an elevated boardwalk trail on Unit A; installing habitat structures; and planting native woody vegetation in all units. This work will enhance a broad range of ecological functions to improve wetland habitat, water quality, and hydrologic functions. 7c. Describe the potential impacts to characteristic uses of the water body. These uses may include fish and aquatic life, water quality, water supply, recreation and aesthetics. Identify proposed actions to avoid, minimize, and mitigate detrimental impacts and provide proper protection of fish and aquatic life. Identify which guidance documents you have used. Attach a separate sheet if additional space is needed. Potential impacts to Springbrook Creek and onsite wetlands, proposed avoidance and minimization measures, and proposed compensatory mitigation measures are summarized in the following paragraphs. The following attachments provide detailed information and analysis of impacts to Springbrook Creek and onsite wetlands and proposed actions to avoid, minimize, and mitigate detrimental impacts: • Attachment B — Mitigation Bank Instrument • Attachment D — Biological Assessment • Attachment E — Springbrook Fisheries Review White Paper Potential Impacts Fish and Aquatic Life: Temporary riparian area and wetland impacts will occur within Units A, B, and E when riparian and wetland areas are enhanced by mowing, clearing, and grubbing invasive vegetation; installing erosion control measures; and planting or underplanting with native vegetation. Although existing riparian conditions vary, the majority of these areas on site are currently moderately to severely degraded. Therefore, many of the functions that riparian vegetation provides are already altered and will not be substantially affected as compared to existing conditions. Noise impacts will be greatest during construction along Springbrook Creek; however, this area is already exposed to a high level of ambient noise (highways, airport, railroad, adjacent road arterial, and commercial/industrial land uses). Any noise impacts to fish will be minimized by limiting the timeframe associated with breaching of the berms next to Springbrook Creek to the Washington Department of Fish and Wildlife (WDFW) in -water work window, when the fewest number offish are expected to be present. The berms that presently separate Springbrook Creek from Units A, B, and E will be breached to reconnect Springbrook Creek to its historic floodplain. Unit E will be graded such that all water will directly drain out to Springbrook Creek as floodwaters recede. However, Units A and B Will have some surface areas that will retain water after floodwaters recede. It is possible that juvenile salmonids may become stranded in these lower elevation areas in Units A and B. However, the potential for fish stranding after construction should be less than under present conditions. Once constructed, the project will result in many positive impacts to fish and aquatic life. The Springbrook Bank will restore, rehabilitate, enhance, and permanently preserve wetland and riparian areas and upland buffers throughout the site. Habitat improvements include removal of invasive plant communities and replacement of those communities with diverse, native, multi -strata vegetation that will provide increases opportunity for food and shelter. Reconnecting Springbrook Creek to its historic floodplain will provide wider stream margins with slower velocity waters, which will provide off -channel refugia habitat for juvenile salmonids and other resident species. Placement of large woody debris and other special habitat features will provide cover for prey species and fish. Improved groundwater connectivity will increase groundwater recharge and improve water aualitv in Springbrook Creek by contributina cooler, cleaner water. Water Quality: All units will experience some elements of clearing, grubbing, grading and excavation activities, mowing of invasive species, and placing of erosion control measures. Any of these activities that temporarily disturb soil could result in erosion and sedimentation. Breaching of the berms will occur during summer low flows to further limit sediment from entering Springbrook Creek and so that no in -water work will be required in Springbrook Creek. Best management practices (BMPs), conservation measures, and performance standards will be implemented to minimize the impacts of sedimentation and turbidity. Turbidity levels will not exceed maximums specified in the Water Quality Standards for Surface Waters of the State of Washington (Chapter 173-201A Washington Administrati de [WAC]). To reduce or eliminate impacts from construction -related pollutant spills, a Spill Prevention, V Control, and Countermeasures (SPCC) Plan will be prepared for this project. The SPCC Plan will be developed and submitted by the contractor to the project engineer prior to commencing any construction. BMPs will be implemented during project construction to reduce or eliminate potential sources of hazardous material contamination. Though the berm breaches may extend slightly below the OHW mark of Springbrook Creek, construction equipment will not enter Springbrook Creek below the wetted perimeter and all berm breach excavation work will be done during summer low creek -flow periods. Additional BMPs, conservation measures, and performance standards will be implemented to avoid, minimize, and control potential discharges of surface contaminants, including turbidity, into Springbrook Creek and the onsite wetlands. Water Supply: Two types of changes to surface water supply will occur as a result of the project, both of which are beneficial to Springbrook Creek and the onsite wetlands. First, the existing earthen berms along the edge of Springbrook Creek will be breached at multiple locations on Units A, B, and E in order to reconnect Springbrook Creek with its historic floodplain. Second, to enhance wetland hydrology on Units D and C, a drainage conveyance pipe will be installed on Unit D. This will also benefit Unit C since Unit D currently drains northward to Unit C. This conveyance pipe will convey approximately 45,000 cubic feet of additional surface hydrology per month to wetlands on the north end of Unit D from an existing stormwater treatment/detention facility drainage outfall located at the south end of Unit D. The existing stormwater treatment/detention pond currently discharges into the existing city stormwater conveyance system under SW 43rd Street, which eventually discharges directly into Springbrook Creek. Recreation and Aesthetics: The site will be fully vegetated with native trees and shrubs and permanently protected from development and recreational uses, with the exception of the elevated boardwalk trail in Unit A. With the addition of an elevated boardwalk trail in Unit A, a passive recreational use along the boardwalk will be enjoyed by those that use the trail. The trail will be accessible for all pedestrian foot traffic (no bicycle traffic), including people with disabilities, and will connect to a larger, regional trail system — the King County regional Interurban Trail and the King County regional Green River Trail. The elevated boardwalk trail design will include measures, such as side rails, to prevent impacts from human intrusion into vegetated areas of Unit A. In addition, areas adjacent to the elevated boardwalk trail within the temporary boardwalk trail construction corridor will be replanted with native trees and shrubs. Avoidance and Minimization Measures To minimize impacts to fish, aquatic life, and water quality, the following BMPs will be employed: • To prevent fish stranding, low -flow connecting channels were incorporated into the design of Unit E. Also, berm breach elevations on Unit E are immediately below the OHW mark of Springbrook Creek. • To prevent fish stranding, earthen berm breach elevations on Units A and B match adjacent wetland elevations. • A 40-foot-wide protection setback area (buffer) will be established between the proposed habitat and incompatible land uses. • Prior to the start of construction, all sensitive areas and clearing limits will be marked with high visibility construction fencing, and erosion control devices will be placed to prevent runoff of sediment into wetlands and streams. The Contractor will confine construction projects to the minimum area necessary to complete the project as defined by the flagged clearing limits • Impacts on wetlands and streams will be minimized during construction through the use of approved temporary erosion and sediment control BMPs. • Impacts to streams will be minimized during work in, over, and adjacent to water through the use of approved BMPs. • Temporary material storage stockpiles will not be placed in the 100-year floodplain between October 1 and May 1. Material used within 72 hours of deposition will not be considered a temporary material storage stockpile. All temporary material storage stockpiles will be protected by a�w mPs to pr Jent sediments from leaving the stockpiles. (,(Ai.( 4, �If��("� • When practicable, all fueling and maintenance of equipment will occur more than 00 feet from the nearest wetland, ditches, and flowing or standing water (fueling large cranes, excavators, and drill rigs over 300 feet away may not be practicable). • Vegetation will only be grubbed from areas undergoing permanent alteration. • No temporary project light, including mobile units, will shine directly on any waters known to contain listed fish outside of the in -water work window time periods. • Within 300 feet of waters known to contain Endangered Species Act (ESA) -listed fish life, all temporary project lighting will be minimized between sunset and sunrise from November 1 to January 15, and from March 15 to May 15. • Construction equipment will not enter any water body without authorization from WDFW. Equipment shall be operated as far from the water's edge as possible. • The contractor will provide advance notification to WDFW and the Washington State Department of Ecology (Ecology) before commencing work in an environmentally sensitive area, in accordance with permit conditions. Living plant material and large woody debris will be incorporated in the bank protection designs where appropriate. Riparian vegetation will be replanted with species native to the region. • Disturbed areas will be replanted with native plant species. • All excess excavated material will be removed and placed in WSDOT-approved upland locations where it cannot enter waters of the state---Gr/ city of 12.r�., • WSDOT inspectors will monitor site construction to assure work is completed according to site plan sheets and permit conditions. • Site elevations. will be surveyed in Units A, B, C, and E during construction to assure excavated elevations are within 6 inches of the sit_ e �radingpan,— { W 5J)07 c�,a CiAj of 1� ^ • Project staff'will oversee construction to assure compliance with contract language, special provisions, and all existing WSDOT environmental procedures. • Woody habitat structures and plant material will be inspected, properly stored, and installed. • All washwater associated with construction will be contained to prevent runoff into adjacent wetlands and Springbrook Creek. • WSDOT will utilize a commitment tracking system to identify all commitments made during ESA consultation, State Environmental Policy Act (SEPA), design, and permitting. All project commitments will be clearly communicated in the Request for Proposals (RFP) to the contractor, who will in turn communicate commitments to project office staff and supporting design offices. Commitments will be tracked throughout the various stages of the project delivery. • The Contractor will be required to prepare and implement an Environmental Compliance Plan (ECP) and assign and Environmental Compliance Manager (ECM) to oversee implementation of the ECP. • WSDOT and the contractor will implement the Environmental Compliance Assurance Procedure for Construction Projects and Activities, which can be accessed at- http://www.ws(Jot.wa.gov/fasc/Enginee ingPublications/Manuals/4055.pdf • WSDOT will require the contractor to locate any off -site staging areas more than 300 feet from any wetlands, ditches, flowing or standing water, or other sensitive areas. The contractor will be responsible for the preparation of a SPCC Plan to be used for the duration of the project. The SPCC Plan will be submitted to the project engineer prior to the commencement of any construction activities. A copy of the SPCC Plan with any updates will be maintained at the work site by the contractor. - The S?CC Plan will identify construction planning elements and recognize potential spill sources at the site. The SPCC Plan will outline responsive actions in the event of a spill or release, and will identify notification and reporting procedures. The SPCC Plan will also outline contractor management elements, such as personnel responsibilities, project site security, site inspections, and training. - The SPCC Plan will outline what measures the contractor will take to prevent the release or spread of hazardous materials either found on site or encountered during construction but not identified in contract documents, or any hazardous materials that the contractor stores, uses, or generates on the construction site during construction activities. These items include, but are not limited to, gasoline, oils, and chemicals. Hazardous materials are defined in Revised Code of Washington (RCW) 70.105.010 under "hazardous substance." Compensatory Mitigation • The construction of the elevated boardwalk trail on Unit A, located within the 2.66-acre trail zone, will be mitigated by the minimized trail footprint and the wetland rehabilitation work that will occur within the 2.66-acre trail zone area, minus the 8-foot-wide by 1,365-foot-long (or approximately 0.25 acre) boardwalk trail footprint itself. In order for the wetland rehabilitation work to adequately mitigate for placement of the elevated boardwalk trail, the entire 2.66-acre trail zone will not generate any mitigation bank credits. • All other impacts are considered temporary construction impacts are essentially self -mitigated by the project. fe(r jrJt�1M yV�or M asl et� As W PI p u(II 6e AV p 7d. For in water construction work, will your project be in compliance with the State of Washington water quality standards for turbidity WAC 173.201A-110? x YES EJ NO (See USEFUL DEFINITIONS AND INSTRUCTIONS) 8. Will the project be constructed in stages? YES �x NO Proposed starting date: Summer or Fall 2006 Estimated duration of activity: Approximately 24 months Project work will begin during the summer or fall of 2006 and extend through 2008, taking approximately 24 months. Site preparation activities, such as installation of erosion control measures and initial reed canarygrass removal activities, will occur during seasonally dry periods in the summer and fall of 2006. Site clearing, grubbing, grading, habitat structure installation, elevated boardwalk trail construction, and Units A and B berm breaches will occur during seasonally dry weather periods in the late spring, summer, and early fall of 2007. Berm breaches on Unit E will occur during seasonally dry weather periods in the late spring or summer of 2008. Vegetation planting activities will occur during seasonally wet weather periods in the late fall and winter of 2006; early spring, late fall, and winter of 2007; and early spring of 2008. 9. Check if any temporary or permanent structures will be placed: N/A ❑ Waterward of the ordinary high water mark or line for fresh or tidal waters AND/OR ❑ Waterward of the mean higher high water for tidal waters? 10. Will fill material (rock, fill, bulkhead, or other material) be placed: No Waterward of the ordinary high water mark or line for fresh waters? If YES, VOLUME (cubic yards) / AREA (acres) Waterward of the mean higher high water for tidal waters? If YES, VOLUME (cubic yards) / AREA (acres) 11. Will material be placed in wetlands? ❑ YES Fx NO If YES: A. Impacted area in acres: B. Has a delineation been completed? If YES, please submit with application. Ox YES NO See Attachment F — Wetland Delineation Report C. Has a wetland report been prepared? If YES, please submit with application YES NO See Attachment B — Draft Mitigation Bank Instrument D. Type and composition of fill material (e.g., sand, etc.) E. Material source: F. List all soil series (type of soil) located at the project site, and indicate if they are on the county's list of hydric soils. Soils information can be obtained from the natural Resources Conservation Service (NRCS). Snohomish silt loam, Woodinville silt loam, Puyallup fine sandy loam, and Puget silty clay loam. The Puget, Snohomish, and Woodinville series are listed as hydric soils. G. WILL PROPOSED ACTIVITY CAUSE FLOODING OR DRAINING OF WETLANDS? ❑x YES ❑ NO The Springbrook Bank project proposes to supplement existing hydrology to Unit D (which will eventually drain to Unit C and then to Unit B) and proposes to breach earthen berms located on Units A and B in order to reconnect Springbrook Creek with its historic floodplain wetlands. No wetlands are proposed to be drained. If YES, IMPACTED AREA IS ACRES OF DRAINED WETLANDS. NOTE: If your project will impact greater than % of an acre of wetland, submit a mitigation plan to the Corps and Ecology for approval along with the JARPA form. NOTE: A 401 water quality certification will be required from Ecology in addition to an approved mitigation plan if your project impacts wetlands that are: a) greater than''/2 acre in size, or b) tidal wetlands or wetlands adjacent to tidal water. Please submit the JARPA form and mitigation plan to Ecology for an individual 401 certification if a) or b) applies. 12. Stormwater Compliance for Nationwide Permits Only: This project is (or will be) designed to meet ecology's most current stormwater manual, or an Ecology approved local stormwater manual. �x YES NO If YES — Which manual will your project be designed to meet? WSDOT March 2004 Highway Runoff Manual If NO — For clean water act Section 401 and 404 permits only — Please submit to Ecology for approval, along with this JARPA application, documentation that demonstrates the stormwater runoff from your project or activity will comply with the water quality standards, WAC 173.201(A) 13. Will excavation or dredging be required in water or wet Os? x❑ YES NO If YES: l� r �" y p)n ✓ .rr�c. a� A. Volume: Approximately 264,000 (cubic yards) /area 17.84 (acre) B. Composition of material to be removed: Old fill material: primarily glacial till, silt, and sand C. Disposal site for excavated material: WSDOT-approved upland disposal site to be determined by contractor D. Method of dredging: Hydraulic excavator 14. Has the State Environmental Policy Act (SEPA) been completed ❑ YES x0 NO A SEPA Environmental Checklist has been completed and a DNS is anticipated. SEPA Lead Agency: (,J 7— SEPA Decision: DNS, MDNS, EIS, Adoption, Exemption Decision Date (end of comment period) SUBMIT A COPY OF YOUR SEPA DECISION LETTER TO WDFW AS REQUIRED FOR A COMPLETE APPLICATION 15. List other Applications, approvals or certifications from other federal, state or local agencies for any structures, construction discharges or other activities described in the application (i.e. preliminary plat approval, health district approval, building permit, SEPA review, federal energy regulatory commission license (FERC), Forest practices application, etc.). Also, indicate whether work has been completed and indicate all existing work on drawings. NOTE: For use with Corps Nationwide Permits, identify whether your project has or will need an NPDES permit for discharging wastewater and/or stormwater. TYPE OF APPROVAL ISSUING AGENCY IDENTIFICATION DATE OF APPLICATION DATE APPROVED COMPLETED? NO. Section 402 NPDES Permit Ecology No CZMA Consistency Determination Ecology No ESA Concurrence Letter USFWS No ESA Concurrence Letter NMFS No EFH Concurrence Letter NMFS No Shoreline Substantial Development City of Renton No Section 106 Concurrence Letter SHPO No 16. Has any agency denied approval for the activity you're applying for or for any activity directly related to the activity described herein? ❑ YES NO If YES, explain: ECY 070-15 (Rev. 11/04) JARPA Contact the State of Washington Office of Regulatory Assistance for latest version or call 360/407-7037 or 800/917-0043 SECTIUN B - Use for Shoreline and Corps of En 17a. Total cost of project. This means the fair market value of the project, including materials, labor, machine rentals, etc. $7 million 17b. If a project or any portion of a project receives funding from a federal agency, that agency is responsible for ESA consultation. Please ndicate if you will receive federal funds and what federal agency is providing those funds. See instructions for information on ESA.* =EDERAL FUNDING ❑ YES �x NO If YES, please list the federal agency. 18. Local government with jurisdiction: City of Renton 19. For Corps, Coast Guard and DNR permits, provide names, addresses and telephone numbers of adjoining property owners, lessees, etc. Please note: Shoreline Management Compliance may require additional notice — consult your local government. Attachment G — List of Adiacent Property Owners for a map and full list of adjacent property owners. SECTION C - This section MUST be completed for anv permit covered by this application 0. Application is hereby made for a permit or permits to authorize the activities described herein. I certify that I am familiar with the information contained in this application, and that to the best of my knowledge and belief, such information is true, complete, and accurate. I further certify that I possess the authority to undertake the proposed activities. I hereby grant to the agencies to which this application is made, the right to enter the above -described location to inspect the proposed, in -progress or completed work. I agree to start work ONLY after all necessary permits have been received. DATE SIGNATURE OF APPLICANT DATE SIGNATURE OF AUTHORIZED AGENT I HEREBY DESIGNATE TO ACT AS MY AGENT IN MATTERS RELATED TO THIS APPLICATION FOR PERMIT(S). I UNDERSTAND THAT IF A FEDERAL PERMIT IS ISSUED, I MUST SIGN THE PERMIT. SIGNATURE OF APPLICANT DATE SIGNATURE OF LANDOWNER (EXCEPT PUBLIC ENTITY LANDOWNERS, E.G. DNR) THIS APPLICATION MUST BE SIGNED BY THE APPLICANT AND THE AGENT, IF AN AUTHORIZED AGENT IS DESIGNATED. 18 U.S.0 §1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States knowingly falsifies, conceals, or covers up by any trick, scheme, or device a material fact or makes any false, fictitious, or fraudulent statements or representations or makes or uses any false writing or document knowing same to contain any false, fictitious, or fraudulent statement or entry, shall be fined not more than $10,000 or imprisoned not more than 5 years or both. COMPLETED BY LOCAL OFFICIAL A. Nature of the existing shoreline. (Describe type of shoreline, such as marine, stream, lake, lagoon, marsh, bog, swamp, flood plain, floodway, delta; type of beach, such as accretion, erosion, high bank, low bank, or dike; material such as sand, gravel, mud, clay, rock, riprap; and extent and type of bulkheading, if any) B. In the event that any of the proposed buildings or structures will exceed a height of thirty-five feet above the average grade level, indicate the approximate location of and number of residential units, existing and potential, that will have an obstructed view: C. If the application involves a conditional use or variance, set forth in full that portion of the master program which provides that the proposed use may be a conditional use, or, in the case of a variance, from which the variance is being sought: These Agencies are Equal Opportunity and Affirmative Action employers. For special accommodation needs, please contact the appropriate agency in the instructions ECY 070-15 (Rev. 11/04) JARPA Contact the State of Washington Office of Regulatory Assistance for latest version or call 360/407-7037 or 800/917-00 JARPA Drawings ATTACHMENT B Draft Mitigation Bank Instrument ATTACHMENT C 60% Design Plans ATTACHMENT D Biological Assessment ATTACHMENT E Springbrook Fisheries Review White Paper ATTACHMENT F Wetland Delineation Report ATTACHMENT G List of Adjacent Property Owners INDEX SHEET NO. PLAN REFERENCE N0. T I T L E t II INDEX 2 - - VI --------- VICINITY MAN / Project Location -- - 3 Tt - --- ---- -- - - - VICINITY MAP /Existing -Conditions 4-9 SP 1 6 SITE PREP SHEETS (6) -- - - - i- ? 10-15 -- - - - -- GR 1 - 6 - -- - - --- --- -- - --------- -- - GRADING SHEETS 6) ------ - --- — --- - - -- --- - ---- _ - 16-21 - --- P 1 - 6 _--__._.•.__— PLANTING SHEETS (6) - - -- - ---- - -- -- --------- - ... ..... ------- -.-- 22-37 D 1 - 16 ---- .._.._..._... -- DETAIL SHEETS 116) --------.------- i----- -__-_______.-- - ___ ....... _- ) J e i PURPOSE: Wetland Mitigation SPRINGBROOK REFERENCE#: 000000000 APPLICANT: WSDOT Key Map and Vicinity Map PROPOSED/RETAIN: IN: Streams and Wetiands NEARIAT: Renton COUNTY: )Gng STATE: WA DATE: 10/25/05 HORIZONTAL DATUM-_ PROJECT VERTICAL DATUM: NAVD 88 SHEET i1 OF 37 �Ml 32MEMP-000- PROJECT LOCATION I E- B A 7 181 4- nn f.Flq;vj PROJECT LOCATION MA PURPOSE., Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: REFERENCE 9- 000000000 IN: Slmlams and Wetlands APPLICANT: WSDOT NEARIAT: Renton COUNTY: King STATE: WA HORMONTAL DATUM- PROJECT Key Map and Vicinity Map DATE: 10125l05 VERTICAL DATUM: MAVD 98 SHEET V1 OF 37 LONG:-122°14'10" LAT.- 47°27'29" _ I H SUBJECT SITE: - SPR I NGBROOK UNIT 8 LONG:-122614'24°€ - . _ LAT: 47 2719" It= - ------------ - - r:�. - :::::::::::: _... - u SUBJECT SITE: SPRINGBROOK UNIT C SUBJECT SITE: SPRINGBROOK UNIT D SUBJECT SITE: - SPRINGBROOK UNIT E LONG:-122°14'08" LAT: 47026'49" i-. LT � - LONG:-122°13'26" LAT: 47"27'28" >- Q w SUBJECT SITEt RINGBROOK UNIT A si 41 S T j S T -- -_ S E 3?D S LONG: -122° 14'27" LAT: 47 l s%T j i S T 26 29 CREEK L�@t1CI SpRINGBROOK + VICINITY MAP Existing rrTs z 5 Wetlands PURPOSE: WeUand Mitigation SPRINGEIROOK PROPOSED/RETAIN: > REFERENCE 8: 000000000 IN: Streams and Wetlands WSDOT NEARJATAPPLICANT: C COUNTY: COUNTY:: Renton lGng STATE: WA HORMONTAL DATUM: PROJECT Key Map and Vicinity Map DATE: 10/25/05 vExncAL DATUM: HAvo ea SHEET T1 OF 37 +• DitchLegend Wetlands I* Storm Inlet 1Manhole F0Low Flow Chan. HWM Line _lCatchBasin Line Cut Line Fill Line �! -� ' •QLow ImpactSik Fence High Vitsibift Fence B Selective Clearing and Grubbing Clearing and Grubbing : Reed Canary RemovalGrass Construction and Tire Wash ffiff- Mn" Iry .� y t6g,� 1 A M ,y t r. PURPOSE:1... -.. .•. . ( ,. REFERENCE #: .. 0 + + ALL WORK WILL BE WITHIN THE HIGH VISIBILITY FENCE R Legend fF ` �7Wetlands --� Ditch o Storm Inlet ® Storm Manhole -..-- OHWM Line ---- Low Flow Chan. --- CatchBasin Line �---� Cut Line -�--{•Fill Line Low Impact Sift Fence High Visibility Fence Property Line Selective Clearing and Grubbing Cfearfng and Grubbing Reed Canary Grass Removal Construction Entrance and Tire Wash KEY A � F F PURPOSE: Weiland Mitigation SPRINGBROOK PROPOSEDIRETAIN: " o 100 Zoe REFERENCE #: 000000000 IN: Streams and Wetlands F APPLICANT: WSDOT NEARIAT: Renton $ COUNTY: King STATE WA HOR{ZDNTAL DATUM: PROJECT VERTICAL DATUM: NAVD 88 Permit Drawings SITE B DATE: 10/25/05 --- SHEET SP2 OF 37 Legend `-7wadands Ditch 11 Storm Inlet 0 Storm Manhole OHWM Line Low Flow Chan. CatchBasin Line Cut Line Fill Line Low Impact Silt Fence High Misibility Fence Property Line Selective Clearing and Grubbing Clearing and Grubbing Reed Canary Grass Removal Construction Entrance and 'r1re Wash 0 ----------------- ININNNNNON.. lop P X! pp,%l 01 OF 6 E 7777777777f7�- PURPOSE: ViVetand Mitigation SPRINGBROOK PROPOSEDIRETAIN: 4 0 100 2W REFERENCE#: W 0 00000000 IN: Streams and Wetlands APPLICANT: WSDOT NEAR/AT: Renton COUNTY: King STATE: WA ;...L (DATUM: PROJECT Permit Drawings SITE C i VERTICAL DATUM: NAVD W SHEET SP3 OF 37 ALL WORK WILL BE WITHIN THE HIGH VISIBILITY FENCE 1 I � f U z I Y PURPOSE: Wetland Mitigation UNIT SPRINGBROOK REFERENCE #: 000000000 APPLICANT: WSOOT Permit Drawings SITE C F PROPOSEDIRETAIN: IN: Streams and Wetlands NEARIAT: Renton COUNTY: King STATE: WA DATE: 10/25/05 Legend -:;7 wetlands - pitch * Storm Inlet o Storm Manhole • OHWM Line Low Flaw Chan. a----- CatchBasin Line Cut Line —• w Fill Line Low Impact Silt Fence High Visibility Fence --- Property Line ® Selective Clearing and Grubbing ® Clearing and Grubbing ® Reed Canary Grass Removal Construction Entrance and Tire Wash Fill 10 as B N A o goo moI 9 HORIZONTAL DATUM: PROJECT VERTICAL DATUM: NAVD 88 SHEET SPA OF 37 NO ALL WORK WILL BE WITHIN THE HIGH VISIBILITY FENCE EXISTING WETLAN MITIGATION SITE BY OTHERS EXISTING STORM WATER POND PURPOSE: Wetland Mitrcjabon Lid — w� Wetlands pitch \ a Storm Inlet � Storm Manhole �- -a--- OHWM Line - - - - Low Flow Chan. SW 40TH STCatchBasin Line -a—� Cut tine -- u Fill Line Low Impact Silt Fence High Visibility Fence -- Property Line Selective Clearing and Grubbing Clearing and Grubbing F.= Reed Canary Grass Removal Construction Entrance and Tire Wash x L O� �O V� �a SW 43RD ST SPRINGBROOK PROPOSEDIRETAIN: REFERENCES: 000000000 IN: Streams and Wetlands APPLICANT: WSOOT NEARIAT. Renton COUNTY: King WA Permit Drawings SITE D DATE: 10/25/05 KEYMAP B 3 A o too Feat s HORtZONTAi- DATUM: PROJECT VERTICAL DATUM: NAVD 88 SHEET SP5 OF 37 ALL WDRK WILL BE WITHIN THE HIGH VISIBILITY FENCE UNIT E SW 40TH ST Legend `7 Wetlands Ditch Storm Inlet ra Storm Manhole -«-- OHWM Line - - - - • Low Flow Chan. a-- CatchBasin Line -� Cut Line -„u—•� Fill Line Low Impact Silt Fence High Visibility Fence Property Line Selective Clearing and Grubbing ® Clearing and Grubbing Reed Canary Grass Removal Construction Entrance and Tire Wash B "92 A PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEMETAIN: REFERENCE *: w Fact 000000000 IN: Streams and Wetlands tJ NEARIAT: Renton S APPLICANT: WSDOT COUNTY: King STATE: WA VERTICAL DATUM: NAVD s� Permit Drawings SITE E DATE: 10/25/05 SHEET SP6 OF 37 SEE SHEET DI FOR TYPICAL BREACH sccnow 'uw/rs ^ u o` W Z7TH ST _j . Legend VeUands -+ umm o Storm Inlet 0 Storm Manhole ---~~- 0HVVMUnn ----- Property Line Low Flow Chan. --�- Catch8aonUne Cut Line ~~-~~ Fill Line Pmmnmod Conm. `-_... -ST—ST Proposed Storm Line 8 REFERENCE#: 0 IN: Streams and Watiancls W+ APPLICANT: WSD07 COUNTY: King STATE. WA VERTICAL DATUM: MVO 88 Legend I Wetlands Lu I - j Ditch _...T .�..__.. _-_ . _ I hole Storm Inlet OHWM Line -.,.. w Property Line _ W _ ...-. Low Flow Chan. CatchBasin Line Cut Line Fill Line W Proposed Contour w - -- . _ ST —sT Proposed Storm �. j Line W - - w - - r� LU _ LU 0' -N I __T - - - - - - - - - - - - I i x '.rx. W. •. a .. w. <v _ , .� ,a ry M .� � .. u lei. + .' '�... E)UST1N _ 1 µ L MEJLITIAND« ' _ ►IITI6AFiON- SITE-BYS - j `OTj4ERS d., y ;;! 1Z1. . u s, KEYMAP • °-�-,- PURPOSE: Wedand Mitigation SPRINGBROOK PROPOSEDIRETAIN: 0 100 2w REFERENCE 0: "�E F,� 000000000 IN: Streams and Wetlands NEARIAT: Renton ' APPLICANT: WSDOT NORQONTAL DATUM: PROJECT COUNTY: King STATE: WA VERTICAL DATUM: NAVD 88 Permit Drawings SITE 8 DATE: 10/25/05 SHEET GR2 OF 37 i ► , Leaend j I ! r 7 Wetlands ) — Ditch 1 j C Storm Inlet i Storm Manhole O�M Line f U N I T C 1 -. —Property Line 4 Low Flow Chan. CatchBasin Cut In ". Fill Line Proposed Contour A)i u V ;: t sT—srProposed Storm Line ti £ u is $> m. �_ ... .F[ '� w Y. roL $'": � • I -. `.s �-.f�T'.r'a i"^'� ♦n .. e ! KEYMAP X 3 ! 1v3 B A E E 1 ' PURPOSE: Wetland Mitigation SPRINCBROOK PROPOSEDIRETAIN: 0 100 zoo REFERENCE:E " F'°� ' 000000000 IN. Streams and Wetlands 3 APPLICANT: WSDOT NEARIAT: Renton COUNTY: Ong STATE: WA e NORZOVTAL. DATUM- PROJECT i g Permit Drawings SITE C DATE: 10/25/05 VERTICAL DATUM: NAVD 88 SHEET GR3 OF 37 UNIT C w w w a SEE_ SHEET 64 M � y FAR DETAIL _ ujLN I uj _ ..ub_ . . PURPOSE: Wetland Mitigation SPRINGBROOK REFERENCE #: 000000000 APPLICANT: WSDOT Permit Drawings SITE C PROPOSEDIRETAIN: IN: Streams and Wetlands NEARIAT: Renton COUNTY: King STATE: WA DATE: 1025M Legend Wetlands y Ditch u Storm Inlet Storm Manhole g OHWM Line Property Line . —. Low Flow Chan. . _ CatchBasin Line Cut Line �^ --•� Fill Line --- Proposed Contour -ST—ST Proposed Storm Line KEY B tl A o Too zo w f. Feet HORIZONTAL DATUM: PROJECT VERTICAL DATUM: NAVD 88 SHEET GR4 OF 37 NOTE: WATER FLOWS NORTH TO UNIT ""C" VIA EXISTING DI' SEE SHEET 09 FOR DRAINAGE PROFILE EXISTING WETLAND---J MITIGATION SITE �j`�'.�1 BY OTHERS 0 a EXISTING STORM i WATER POND PURPOSE: Wetland Mitigation Legend ` _.7 Wetlands Ditch n Storm Inlet 0 Storm Manhole OHWM Line St — Property Line w 40TH ST Low Flow Chan. d CatchBasin Line Cut Line Fill Line Proposed Contou ST—ST Proposed Storm Line SEE SHEET 08 FOR DETAIL .a —SEE SHEET DT FOR DETAIL / SW 43RD ST SPRING$ROOK PROPOSEDIRETAIN: REFERENCE #: 000000000 IN: Streams and Wetlands APPLICANT: WSDOT NEARIAT. Renton COUNTY: King STATE: WA Permit Drawings SITE D DATE: 10/25/05 KEY 0 TFeet s HORIZONTAL DATUM_ PROJECT VERTICAL DATUM: NAVD BS SHEET GR5 OF37 SEE SHEET D12 FOR TYPICAL BREACH SECTIONS (UNIT E) SW 40TH ST Legend Wetlands —� Ditch Storm Inlet e Storm Manhole OHWM Line Property Line Low Flow Chan. a - a -- CatchBasin Line �^-- Cut Line u Fill Line Proposed Conta -ST—ST Proposed Storm Line X W 0 PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSED/RETAIN: Y__� REFERENCE#: '" E Feet I 000000000 IN: Streams and Wetlands NEARiAT: Renton g 3 APPLICANT: WSDOT COUNTY Kira} STATE WA VERTICAL HORRONTAL DATUM: PROJECT Permit Drawings SITE E DATE: 10/25/06 SHEET GR6 OF 37 —;7 wetlands Ditch Stream Storm Inlet Storm Manhol - ♦ `7r♦i♦A�rf! dii� Aimed r P O�t�.Ap fcsf�f+s t1A ... �� #1A,• •dr♦6♦A♦ .� r♦2l'! O �♦d•?•AA♦A ♦1' ►r! ♦♦r1•�pA�r♦� 9' Jwy i ♦! �A*.•�9•♦♦+iA� ♦♦dwr�♦♦4 �f `f� •1.A�B:r11:Crr�A>♦1ad iaf•dFP"Ad♦rrfO♦fIW�-K� �A�� 4 A• A,1�d'rfFill Cut Line ►�i�•.`Tj.��♦! �",,A♦,♦♦!♦ `P••♦- ♦A♦• fA4•^/rr•�rr1♦.A• 1!♦9♦i• �I �ai - i 6A.lf'♦A,, �Af♦♦A♦•-a r� 1�1♦•Af♦ ♦♦Ow♦_♦. f ♦AAA!•1♦�fo•♦•♦♦, SEMBRINURNS ♦r1"A♦rf♦wAAA♦f.4 AA! A♦ •♦! Vertical ,•r•♦♦,1`, y1•fv: �•f• r!$111ti fii� .A,► �•�+ .•l�di*.♦1.1,♦♦♦♦ �r♦�+a'- :rAr♦ �I . Ai♦A.♦� ♦-*. ♦ 1 �r�♦r♦Ar,♦!fi♦,Ar�As,�f� ►♦d•.! ♦ •a+ �� rr♦•• fA •♦'�1 A-r•r-�♦♦ •f! fRQ•i!difls!♦fe *+A�r♦f,� • p +,! ♦ AA♦�•♦♦A♦♦♦♦6A.... " +la: 3r♦rsA� a♦f♦ASr ♦A�Ar♦r1 ddrrr.•A idi !d01*♦ r. 7rrt♦�rlA a•♦�ilT♦i+♦AQ dl1A♦!Af! ♦!s•a ems, Awl�1 1*AUA See Anchor•Logs See 1rAArrA*d1�drAlAdd! vAA♦•rrrr '.♦♦� �> ep♦ A a A �► �1 ,�♦1"' f♦'r"1 ►♦ j ♦,•A rA1 d ♦+w.♦ #Hummock i'➢d1r ~ l4fd� Planting ♦ 1,r ,L�9,+ �rAd♦A 5,1,9 •re ��♦,♦ See D15 Brush Pile See D14 Wetland Tree/ Shrub #1 Wetland Tree/ Shrub #2 Wetland Shrub #3 Deciduous Forest Underplanting Upland Habitat Plantings ® Riparian Plantings Emergent Plantings � dl I `♦��i♦ ►�i PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: o ioo zoo REFERENCE #: p s re•t 3 000000000 IN: Streams and Wetlands APPLICANT: WSDOT NEARIAT: Renton HORIZONTAL DATUM: PROJECT B COUNTY: King STATE: WA VE"CAL DATUM: NAVD so Permit Drawings SITE B DATE: 10/25/05 — 1_--_- SHEET__ P2 OF 37 EXISTING WETLAND MITIGATION SITE BY OTHERS EXISTING STORM WATER POND PURPOSE: Wetland Mitigation 1, Legend f ' ;7 Wetlands —a Ditch =� .e— — Stream a Storm Inlet a Storm Manhole OHWM Line SW 40TH ST - - - - Low Flow Chan. CatchBasin Line --_—� Cut Line -�--_= Fill Line d Vertical Snags See D16 Anchor Logs See D 13 Hummock Planting See D15 Brush Pile See D14 Wetland Tree/ Shrub #1 Wetland Tree/ Shrub #2 Wetland Shrub #3 Deciduous Forest Underplanting Upland Habitat Plantings ® Riparian Plantings Emergent Plantings SPRINGBROOK PROPOSEDIRETAIN: D 100 REFERENCE 0' W+ Feet IN: Streams and Wetlands 000000000 APPLICANT: WSDOT NEARfAT: Renton e HORIZONTAL COUNTY: KingSTATE: WA AVD88PROJECT VERTICAL DATUM: NAVD 88 DATUM: Permit Drawings SITE D DATE: 10/25/05 SHEET P5 OF37 20D1 UNIT E SW 40TH ST Legend i �7 Wetlands —� Ditch F— = Stream c Storm Inlet ® Storm Manhole �• �- OHWM Line Low Flow Chan. CatchBasin Line -� Cut Line ••— •LL Fill Line o Vertical Snags See D16 Anchor Logs See D13 Hummock Planting See D15 Brush Pile See D14 Wetland Tree/ Shrub #1 Wetland Tree/ Shrub #2 ® Wetland Shrub #3 ® Deciduous Forest Underplanting Upland Habitat Plantings ® Riparian Plantings Emergent Plantings B 91 A PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETA1N: o 100 200 REFERENCE#: " � Feet 000000000 IN: streams and Webands V NEAR/AT: Renton s APPLICANT' WSDOT COUNTY Kin STATE WA HDR¢oNTA�oATUM_ PRwECT 9 VERTICAL DATUM: NAVD 88 Permit Drawings SITE E DATE: 10/25l05 SHEET P6 OF37 [THIS DETAIL CORRESPONDS SHEET Gilt FA Tt 2 F �rsca :C tJ T 1 c . ' i O f o PLAN r90 BREACH. UNITS A AND B. TYP. OHMM —_ s E SPRINGBROOK CREEK ELEV 12' Ex. GROUND--- 1 � / TYPICAL SECTION A -A BREACH, UNITS A AND B. TYP. a SCALE: N.T.S. t x EX. GROUND ELEV 12' 3 3 20 0' FINISH GRADE V (BREACH BOTTOM) TYPICAL SECTION B-B BREACH, UNITS A AND S. TYP. L SCALE, N.T.S. z PURPOSE: Weftld Mitigation SPRINGBROOK PROPOSEDIRETAIN, REFERENCE#: 3 000000000 IN: Streams and Wetlands APPLICANT: WSDOT NEAR/AT: Renton COUNTY: KingSTATE: WA HORIZONTAL PROTECT NAVD BB DATUMDATUM:: VERTICAL DATtiM: g n DETAIL 1 DATE: 10/25/05 SHEET D1 OF 37 THIS DETAIL CORRESPONDS TO SHEET GR1. v_ 100 YR FLOOD (FEMA) EL. 20.6 8"-0" CLEAR Y 100 YR FLOOD* $ EL. 17.7 - RECYCLED WOOD OR PLASTIC DECKING c J EL. VARIES s 7 � v 10 YR FLOOD* EL. 15.7 g r o 2 YR FLOOD* 9 c EL. 14.5 g �21 � [ 3. _ 0- s MIN. - SHALLOW CLR. FOOTINGS j NY EL. VARIES i� SPRINGBROOK CREEK DATU N,A..V.D M68 TRAIL CROSS SECTION 3 SOURCE: z ► CITY OF RENTON'S HYDRAULIC ANALYSIS FOR FLOODPLAIN MAPPING STUDY OF SPRINGBROOK CREEK, 2004. U G z Y 1 PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: a R£F£RENCE #: 000000000 IN: Streams and Wetlands APPLICANT: WSDOT NEARIAT: Renton COUNTY: IGng STATE: WA HORIZONTAL DATUM: PROJECT DETAIL 2 DATE: 10/25/05 VERTICAL DATUM_ NAVD 88 SHEET D2 OF 37 THIO!DETAIL#CORRESPONDS I TO,SHEET *3. y C i qT :3 b 30 jz a EXISTING GROUND 20 h t � 1 t s t PROPOSED GRADE 10 8 30 20 10 30 PROPOSED GRADE 20 EXISTING GROUND X 10 SECTION A -A SECTION B-B CHANNEL, UNIT C CHANNEL, UNIT C SCALEt N.T.S. SCALEt N.T.S. PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSED/RETAIN- 30 20 to REFERENCE #: OO(t000000 0 IN. Streams and Wetlands APPLICANT: WSDOT NEAR/AT: Renton COUNTY: King STATE WA HORIZONTAL DATUM: PROJECT DETAIL 1 DATE: 10/25/05 VERTICAL oA ea 37 SHEET D3 OF 3 N A v r 3 v. . • v 9 oz Z U o W O p ,O W LL �O r W C W !+ co O t!1 J z n � It�/1d0 LL a oZ� I I PURPOSE: Wetland Mitigation o W 0n i a0 U � / F-• 2 N, In= I X IL I r i tD N r- TT O+ L� �L z 'Q SPRINGBROOK PROPOSEDIRETAIN: REFERENCE #: 000000000 IN: Streams and Wetlands APPLICANT: WSOOT NEARIAT: Renton COUNTY: IOng STATE: WA DETAIL 4 DATE: 10/25/05 t/� • O O W J W W O) 2 -^ M z O i- U U3 Lid HOWONTAL DATUM: PROJECT VERTICAL DATUM: NAVD 88 SHEET D4 OF 37 §2 !$- §B} n§o k4b %(k O»s gw 2s, - »n 61a � $» , � i + ` R G e 7 o �»i �� 2 k , \ ° w ƒ ... 2 /\ jk �~ 0 7 i _§ ! ! ��\ . a■�» ¥2o«| a zoo! | |e«£&� %§ / &(L2 | 2 C)e �WC5� /w i A ¢§z�� w /§0�o - 0 m �« $ \LAJ / �§ �N,S» §� dgt\aka }§ i §2 gf b i ) a| c§ 22 cc §§ §§ � k' Apt % a� JA 22 g»sg<�s-»nxl,a 2 w es@oow ;� 2G ! u§ * a k (0- §�� ~ / §§kwl iC>� ) \ate «§� k |2� % J22 � TO SHEET GR4 30 20 to SECTION B-B GR4 SCALEt HORIZONTAL 1"-50' VERTICAL 1"=5' 30 20 10 PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSED/RETAIN: REFERENCE #• 000000000 IN: stnaams and wedands APPLICANT: WSDOT NEAR/AT: Renton HORRDWTAL DATUM: PROJECT COUNTY: King STATE: WA VERTICAL DATUM: NAVD 88 DETAIL 6 DATE: 10125✓OS SHEET 06 OF 37 THIS DETAIL CORRESPONDS TO SHEET ORS Ex. 12*' CPEP� — - >1I — t FROM DRAINAGE POND EXISTING GROUND EL> 26.2' o 12" DIP W O _ °I ( >I nI 1 � I ^ I 1 I 1 I I 1 1 I T" I 1 t I I t I f 1 I 1 i_ 6'-0" PL AN \�j� >M 3 NOW -SHRINK GROUT i �� ------ v 44' FROM DRAINAGE ( I T 0` POND —ate >4------ — 1 4" — �ex. 12" cPEP !� 1 —► 1 — — J f0 EXISTING STORM SYSTEM EL. 26.2' NON -SHRINK ��GROUIT TI TO EXISTING — STORM SYSTEM `\\/ c `L I DE \j\` ` GATES i EL. 20.6' SECTION DETAIL GR5 STORMVATER DIVERSION STRUCTURE SCALEt 1" 2' PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: REFERENCE * 000000000 IN. Streams and wetlands APPLICANT: WSDOT NEARIAT: Renton HORIZONTAL DATUM: PROJECT COUNTY: King STATE: WA VERTICAL DATUM: NAVD es DETAIL 7 DATE: 10/25/05 SHEET D7 OF 37 TO SHEET IL CORi *POND tt i • i l � .j -,� r t' ly Y = ` ST S4T ST ST ----5 cuT -7 try \.. �y n yr PIPE OUTLET. 'UNIT 0, 1 1`rY 7 ✓ ......7 ..� 0 20 40 N VARIES W 1� 4 4• _ O.. TYPICAL DITCH SECTION EXISTING FLARED END FOR \CROUND 12" PIPE 0.50% Z7 E L . 19.3T E 10' - 0"` 110" tAPPROX.I DETAIL GR5 PIPE OUTLET, UNIT O i SCALEt N.T.S. PURPOSE: Weiland Mitigation SPRINGBROOK PROPOSEDIRETAIN: 000000000 IN: streams and wetlal)ds APPLICANT: WSDOT NEAR/AT: Renton COUNTY: KingSTATE: WA roR1T VERTICAL DATUM: PROJECT VERTICAL DATUM: l44W 88 DETAIL 8 DATE: 10/25/05 SHEET D8 OF 37 0 0 §2R !§ M%k �)ui §§§ , �# §; 0vl13m £ o3S kka ! , � , | ) ' d § f � f i ( c# m§ £ | ■��a CL V)�\(� § / kzoo . o -- f J � | }/ m ca \/ k cr iiO} _ %\ § oOf 3 v/ �2o ■0 § LU § 2:OCL qk $ , 0.0 s �\ ■ Ch § � cc cc ! o � D3S E§ ) 0 2 k (§■ z k . q § ° M § pi _ � �k2 ) THIS DETAIL CORRESPONDS TO SHEET GR6 _I2 _ DETAIL GR6 LOW FLOW CHANNEL, UNIT E SCALEt N.T.S. GROUND INISH GRADE KMETLANDI PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: REFERENCE #: 000000000 IN. Streams and We?lards APPLICANT: NEARIAT! Rerton i WSDOT COUNTY: King STATE: WA HOERTIC LDATAL M: PROJECT DETAIL 11 DATE: 10125,105 VERTICALDATUM: NAVD 88 SHEET D11 OF 37 B a PLAN � �FtW BREACH - UNIT E, TYP. 6 OHMM EX. GROUND — -- _ — — /j ----------_.__ L__,_.—,.------- — EtEV 8' L _ FINISH GRADE (BREACH BOTTOM) e TYPICAL SECTION A —A GR6 _ BREACH - UNIT E, TYP. SCALEt N.T.S. a 3 Ln w } N EX. GROUND g — o � — _ — ELEV 8' 3 I L,.— I�J IFINISH VARIES GRADE r (BREACH BOTTOM) 3 v TYPICAL SECTION B—B GR6 3 BREACH - UNIT E, TYP. SCALEt N.T.S. z PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDiRETAIN: REFERENCE# 000000000 IN: Streams and Wetlands 4 APPLICANT: WSDOT NEARIAT: Renton COUNTY: fling STATE: WA HORIZONTAL DATUM: PROJECT DETAIL 12 DATE: 10/25/05 VERTICAL DATUM: NAVD BB SHEET D12 OF 37 THIS DETAIL CORRESPONDS TO P SHEETS LEGEND PLAN VIEW DETAIL ANCHORED LOG WITH ROOT WAD CABLE WRAPPING SCALE: N.T.S. PURPOSE: Wetland Mitigation SPRINGBROOK REFERENCE 9: 000000000 APPLICANT: WSDOT DETAIL 13 EARTH ANCHOR AND CABLE (TYP.) 10"-12" DIAM. MIN. 15' MIN_ LONG TRUNK WITH 5' OIAM< ROOT WAD PROPOSED/RETAIN- IN: Streams and Wetlands NEAR/AT: Renton COUNTY: KingSTATE: WA HORIZONTAL PROJECT VERTICAL DATUM: NAVD BB DATE: 10/25/05 SHEET DI OF 37 THIS DETAIL CORRESPONDS TO P SHEETS LEGEND APPROX. (4) 2-MAN ROCKS PLACED ABOVE & BELOW LOGS PLAN SECTION DETAIL BRUSH PILE SCALEt N.T.S. NOTE: BRUSH PILES TO BE CONSTRUCTED UTILIZING TREES CLEARED FROM SITE MIN. SASE DIAMETER OF 6 IN. MIN LENGTH OF 5 FT. WE PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: REFERENCE#: 000000000 IN: Streams and Wetlands APPLICANT: WSDOT NEARIAT. Renton HORMONTAL DAnNt PROJECT COUNTY: IGng STATE: WA VERTICAL DATUM: NAVD 88 DETAIL 14 DATE: 10/25/05 SHEET D14 OF 37 THIS DETAIL CORRESPONDS TO P SHEETS LEGEND 12"0 COIR OR CO FIBER LOG DOUBLE LAYER HEAVY CARDBOARD PLANT HUMMOCK WITH SPECIFIED PALETTE - PEAT BASED SOIL MIX WITH HYDRO -POLYMER PELLETS --•• DOUBLE LAYER HEAVY CARDBOARD —\ I t " STAKE WITH RED OSIER7� m rr t �TF•ij�/ DOGWOOD C VO.C. 4( ELEVATION DETAIL HUMMOCK PLANTING SCALE: N.T.S. kil PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN, REFERENCE #: IN: Streams and Wettands 000000000 NEARIAT: Renton APPLICANT: WSDOT King HORPDNTAI DATUM: PROJECT COUNTY: ng STATE: WA VERTICAL DATUM: NAVD a8 DETAIL 16 DATE: 10125/05 SHEET D15 OF 37 THIS DETAIL CORRESPONDS TO P SHEETS LEGEND DETAIL VERTICAL SNAG DETAIL SCALES N.T.S. NOTE: SNAGS OR BRUSH PILES SHOULD BE SALVAGED FROM SITE AS PRACTICABLE PURPOSE: Wetland Mitigation SPRINGBROOK PROPOSEDIRETAIN: REFERENCE #: 000000000 IN: NEARIATStreams and Wetlands: Renton APPLICANT: WSDOT HORIZONTAL owTurrt PROJECT COUNTY: King STATE: WA VERTICAL DATUM: 4AVD 88 DETAIL 16 DATE: 10125M SHEET D16 OF 37 US Army Corps Joint Public Notice of Engineers Seattle District Proposal and ,Application for a Wetland Mitigation Bank > C0I.0G US Army Corps of Engineers Washington Department of Ecology Regulatory Branch SEA Program Post Office Box 3755 3190- 160' Ave. SE Public Notice Date: March 13, 2006 Seattle, Washington 98124-3755 Bellevue, WA 98008-5452 Expiration Date: April 12, 2006 Telephone (206) 764-6911 Telephone (425) 649-7181 Reference No.: 200600100 Attn: Sandra Manning, Project Manager Attn: Rebecca Ponzio, Permit Manager Name: Springbrook Mitigation Bank Interested parties are hereby notified that the U.S. Army Corps of Engineers (Corps), U.S. Environmental Protection Agency, and the Washington Department of Ecology (Ecology), are considering a proposal to construct and operate the Springbrook Wetland Mitigation Bank, in the City of Renton, King County, Washington. In addition, the Corps and Ecology hereby notify interested parties of an opportunity to comment, for permitting and water quality certification purposes, on the proposal to construct and operate the proposed 131-acre Springbrook Creek Mitigation Bank. An application has been received for a Department of the Army permit in accordance with Section 404 of the Clean Water Act for certain work described below and shown on the enclosed drawings. An application has also been filed with the Department of Ecology for a Water Quality Certification, pursuant to the requirement of Section 401 of the Clean Water Act, to certify that the project described below and shown in the enclosed drawings will comply with Sections 301, 302, 303, 306 and 307 of the Act, and complies with applicable provisions of State water pollution control laws. Pursuant to the requirements of Section 307(c) of the Federal Coastal Zone Management Act (16 U.S.C. 1451) Ecology will be reviewing the project to determine if the project is consistent with the Washington State Coastal Zone Management Program. APPLICANT- Washington State Dept. of Transportation 1-405 Project office 600 108" Avenue NE, Suite 405 Bellevue, Washington 98004 Attn: Allison Ray Telephone: (425) 456-8610, e-mail allison.ray@i405.wsdot.wa.gov AGENT - Washington State Dept. of Transportation 600 1081" Avenue NE, Suite 405 Bellevue, Washington 98004 ATTN: Terry Drochak Telephone: (425) 456-8595, e-mail terry.drochak@i405.wsdot.wa.gov LOCATION — The proposed mitigation bank would be constructed at five locations (units) located in the Lower Green River Basin, within Water Resource Inventory Area 9 (WRIA 9), along Springbrook Creek in the southwest portion of the City of Renton, King County, Washington (see figure 1). The units are located in Sections 25, 30 and 36 of Township 23N, Ranges 4E and 5E, on the Willamette Meridian at the following latitudes and longitudes: Unit A - 47027'28"N, 22o13'26"W; Unit B - 47027'29"N, 22014'10"W; Unit C - 47a27'19"N, 22a14'24"W; Unit D - 47026'29"N, 22°14'27"W; and Unit E - 47o26'49"N, 122014'08"W. PROJECT DESCRIPTION - The Washington State Department of Transportation (WSDOT) and the City of Renton are working together to construct and operate a mitigation bank within five units by re-establishing, rehabilitating, and enhancing approximately 131 acres of wetland and riparian area located in Renton, King County, Washington, The Springbrook Mitigation Bank will connect Springbrook Creek to historic wetlands; increase wetland area, hydrologic functions, water quality functions, and habitat functions; and provide environmental education opportunities. The bank will be protected in perpetuity by a conservation easement. The attached drawings show the conceptual design for the proposed bank project (see figures 3-7). A more detailed description of this proposal is available in Springbrook Creek Wetland and Habitat Mitigation Bank Prospectus, dated February 21, 2006. This prospectus is available upon request at the above -listed Corps and Ecology offices. SERVICE AREA - The service area proposed for this mitigation bank would involve the following drainage basins within King County: Green River, Black River, Lake Washington, May Creek, Mill Creek, and Cedar River. Please refer to Figure 2 or the above -referenced prospectus for more detailed information on service area. PURPOSE - The purpose of Springbrook Bank is to provide high -quality, consolidated, off -site compensatory mitigation for unavoidable impacts to aquatic resources caused by WSDOT construction projects and City - approved projects that are authorized by the Corps, Ecology and other regulatory entities that occur within the service area of the bank. The use of bank credits as future compensatory mitigation would depend on case - by -case approval by the involved regulatory agencies after determining that the use of bank credits would be consistent with all applicable rules and policies of the agencies. ADDITIONAL INFORMATION - The bank sponsors will work with a multi -agency Banking Oversight Committee (BOC) to develop a mitigation banking instrument (MBI) and memorandum of agreement (MOA) in accordance with Federal Guidance for the Establishment, Use and Operation of Mitigation Banks and applicable state, local, and other federal requirements. The MBI will detail the legal and physical characteristics of the bank sites and describe how the bank would be established and operated. For additional information on mitigation banking in Washington State, please refer to the following website: http://www.ecy.wa.gov/programslsealwetm tig/index.html ENDANGERED SPECIES - The Endangered Species Act (ESA) of 1973, as amended, requires assessment of an action's potential impacts to listed and proposed species. The Bald eagle (Haliaeetus leueoeephalus) threatened, Coastal -Puget Sound bull trout (Salvelinus confluentus) threatened, and the Puget Sound Chinook (Oncorhynchus tshawytscha) threatened, occur in the proposed project area. For Chinook salmon, critical habitat has been designated in this area. Consultation has been initiated with the US Fish and Wildlife Service and the National Marine Fisheries Service (Services). After receipt of comments from this public notice, and a decision from the Services, the U.S. Army Corps of Engineers will evaluate the potential impacts to these Fisted species and critical habitat. ESSENTIAL FISH HABITAT - The Magnuson -Stevens Fishery Conservation and Management Act (MSA), as amended by the Sustainable Fisheries Act of 1996, requires all Federal agencies to consult with the National Marine Fisheries Service (NMFS) on all actions, or proposed actions, permitted, funded, or undertaken by the agency, that may adversely affect Essential Fish Habitat (EFH). EFH for Pacific salmon occurs in the project area. If the Corps determines that the proposed action may adversely affect EFH for federally -managed fisheries in Washington waters, the Corps will initiate EFH consultation with the NMFS. The Corps' final determination relative to project impacts and the need for mitigation measures is subject to review by and coordination with the NMFS. CULTURAL RESOURCES - The District Engineer has reviewed the latest published version of the National Register of Historic Places, lists of properties determined eligible and other sources of information. The following is current knowledge of the presence or absence of historic properties and the effects of the undertaking upon these properties: There are no recorded historic properties within the permit areas and no sites listed, or eligible for listing, on the National Register of Historic Places are known to exist within the permit area. The District Engineer invites responses to this public notice from Native American Nations or tribal governments, Federal, State, and local agencies, historical and archeological societies, and other parties likely to have knowledge of or concerns with historic properties in the area. PUBLIC HEARING -Any person may request, in writing, within the comment period specified in this notice, that a public hearing be held to consider this application. Requests for public hearings shall state, with particularity, the reasons for holding a public hearing, EVALUATION — Development of the bank would involve the discharge of dredged and fill material into waters of the United States, which requires Department of the Army authorization under Section 404 and Department of Ecology Water Quality Certification under Section 401 of the Federal Clean Water Act. The Corps and Ecology are soliciting comments from interested parties, including the public; Federal, State, and local agencies and officials; Native American Nations or tribal governments; and other interested parties in order to identify project aspects that need to be addressed during the bank review and permitting processes and in the development of the Mitigation Bank Instrument. Public comments will assist in developing facts upon which to base a decision by MBOC member agencies as to whether or not to authorize the proposed mitigation bank. For accuracy and completeness of the record, all comments should be submitted in writing with sufficient detail to furnish a clear understanding of the reasons for that support or opposition. The Corps will evaluate this proposal pursuant to the requirements of Section 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act of 1899, and other applicable Regulatory Program requirements. Ecology will review this proposal for consistency with the Washington Coastal Zone Management Program, compliance with applicable State and Federal water quality standards pursuant to Section 401 of the Clean Water Act and consistency with the state's pilot rule for wetland mitigation bank certifications. The proposal may also require Shorelines Management Act Substantial Development authorization under review by the City of Renton, and Hydraulic Project Approval from the State of Washington. For the Corps to make this decision, comments are used to assess impacts on endangered species, historic properties, water quality, general environmental effects, and the other public interest factors listed above. Comments are used in the preparation of an Environmental Assessment and/or an Environmental Impact Statement pursuant to the National Environmental Policy Act. Comments are also used to determine the need for a public hearing and to determine the overall public interest of the activity. For Ecology to make a decision the work must be consistent with the approved Washington Coastal Zone Management Program, and comply with Section 401 of the Clean Water Act which requires compliance with the applicable State and Federal water quality standards. COMMENT AND REVIEW PERIOD — Conventional mail or e-mail comments on this public notice will be accepted and made part of the record and will be considered in determining whether it would be in the public interest to authorize this proposal. In order to be accepted, a -mail comments must originate from the author's e-mail account and must include on the subject line of the e-mail message the permit applicant's name and reference number as shown below. Both conventional mail or e-mail comments must include the permit applicant's name and reference number, as shown below, and the commenter's name, address, and phone number. All comments whether conventional mail or e-mail must reach this office, no later than the expiration date of this public notice to ensure consideration. Please include the following name and reference number: Washington State Dept. of Transportation, 200600100 Corps comments: All email comments should be sent to Sandra.L.Manning@usace.army.mil, Conventional mail comments should be sent to U.S. Army Corps of Engineers, Regulatory Branch, Attn: Sandra Manning, Post Office Box 3755, Seattle, Washington, 98124-3755. Ecology Comments: Any person desiring to present views on the project pertaining to: (1) request for water quality certification under Section 401 of the Clean Water Act and/or 2) consistency with the Washington State Coastal Zone Management Program, or to provide comments on the bank's processing or operation, may do so by submitting written comments to the following address: Department of Ecology, Attn: Rebecca Ponzio, 3190 160" Avenue Southeast, Bellevue, Washington, 98008-5452, or e-mail to rpon461 @ecy.wa,gov. Encl: Figures (8) I a IP \\ in I-; : _ : , ! . z #• i� � ?! � \ 44, j ~��\\\ . �. S<: At MRSIMMEWIVI. � MPLE p sa P,. f .e3.11 lid �..: a� Z "Y i"OMIT r } I f I i') LL F'^ W W CO) W Z J Z u PURPOSE: Wedand MItIgation SPRINGBROOK PROPOSEDIRETAIN: Figure 6 — Unit C REFERENCE#: 200600100 IN: Streams and wauands NEARIAMitigation Treatments APPLICANT: WSDOT COUNTY: Renton COUNTY: King STATE: WA DATE: 02/15/06 UNIT C LEGEND GRADING. HYDROLOGIC ......�....._...., ALTERATION. AND WETLAND PLANTING INVASIVE REMOVAL AND WETLAND PLANTING f OGIC ALTERATIONAND CONIFER UNDERPLANTING INVASIVE REMOVAL AND CONIFER UNQERPLANTING >— EXISTING CONVEYANCE DITCH VERTICAL SNAG LOG ly BRUSH PILE -- DITCH PLUG °rile HORIZONTAL DATUM: PROJECT VERTICAL WWI NAVDaa CIP FILE OUTLINE 1000 CORRESPONDENCE 001 General Correspondence �' L, 00Consultant Correspondence 10 _City Correspondence 4/ Other Agencies Correspondence 1005 Contractor Correspondence 1006 Grants/Loans - Correspondence 1100 DESIGN/PLANNING �10� Design Consultant Selection 1 3 Contracts Reports/Studies/Calculations -_� 1105 Consultant Payments 200 ` AGREEMENTS 1 0 SEPA (:j_ PERMITS/PLAN REVIEW -� A509-,) EASEMENTS/DEEDS 1600 CONSTRUCTION 1601 Construction Bid Information 1602 Construction Contract Insurance & Legal Review 1603 Construction Contract Document 1604 Construction Submittals Materials Shop Drawings Schedules Traffic Control Plan 1605 Construction Pay Estimates Prevailing Wages 1606 Construction Change Orders 1607 Construction Inspection/Progress Reports Photos, Site Condition Reports 1609 Construction Management Services (Consultant) Contract Invoices 1610 Operations & Maintenance General Information Manual As-Built/Survey Notes 1700 LITIGATION 1800 LID 1801 LID Public Notification 1802 LID Public Meetings 1803 LID Final Assessment Roll 1804 LID Miscellaneous 1900 SAD 1901 SAD Public Notification 1902 SAD Public Meetings 1903 SAD Final Assessment Roll 1904 SAD Miscellaneous H/DIV/UTIL/FILEOTLA.DOC\If r, 2 EfC'4 h4�n Z- FvV, j dui ,'s) s / Z-e Lw-r _ Z > (, - I j /1 Q IS 1 `'IL11 EKI'd 1,� / l IC ` S G,1p-- 'a- 3 / ? U Congestion Relief & Bus Rapid Transit Projects September 1, 2005 Subject: Springbrook Wetland and Habitat Mitigation Bank: Springbrook Creek Wetland Restoration Memorandum Executive Summary The Washington State Department of Transportation (WSDOT) and the City of Renton are working together to establish the Springbrook Wetland and Habitat Mitigation Bank (the Bank). The Bank is comprised of five wetlands units: A, B, C, D, and E. This memorandum addresses the hydrologic rehabilitation of Units A and B and the re-establishment of wetland hydrology at Unit E. Rehabilitation of Units A and B will be achieved by providing hydrologic connections with Springbrook Creek. Re-establishment of Unit E wetlands will depend on providing sufficient water to the site to establish vegetation typically found`in saturated soil conditions. Unit E will depend primarily on flows entering the site from Springbroo c Creek for its source of water. Unit C is addressed in a separate memorandum because it does not depend on Springbrook Creek as a source of hydrology. Instead, the hydrology of Unit C` is characterized by using a water balance that includes stormwater runon volumes, piezor60 ric data, infiltration, and evapotranspiration calculations (1-405 Corridor Program, 2005). Springbrook Creek hydrology was investigated using the Hydrologic Simulation Program — FORTRAN (HSPF) program. A continuous hourly precipitation record from Seattle -Tacoma International Airport for water years 1949 to 2001 was used to generate 53 years of continuous flow in Springbrook Creek. The mod wasgcalibrated to streamflow data from water years 1995 and 1996. Analysis of the model wused'to'determine the inundation and duration at Units A, B, and E. a y:, The rehabilitation of Units A and B will depend on creating breaches to provide more efficient connection of flows with Springbrook Creek through the existing levee. Analysis of Units A and B demonstrates that modifying the existing levee with breaches will provide hydrologic connections between the existing wetlands and Springbrook Creek, augment the wetland hydrology in Units A and B, increase stream interaction with the floodplain, and potentially reduce the elevation and duration of Springbrook Creek peak flows. The breach elevations were set at the elevations of the existing delineated wetlands. It is anticipated that the 12-foot elevation of the breach will provide 77 hours (3.2 days) of inundation annually, and 23 hours (1 day) of inundation during the mesic growing season defined from March 1 through October 31. It is anticipated that the depth of flows on the site will range from 0 to 2 feet as a result of inundation from Springbrook Creek. The success of the re-establishment of Unit E depends on inundation by Springbrook Creek, duration of the flows, and on the saturation of soils. Breaches have been created to facilitate Springbrook Creek flows into and out of the site without causing erosion to the site, flooding to surrounding properties, or stranding of fish species. It is anticipated that the depth of flows at 20050901 Springbrook Wetland Restoration Memo.doc Congestion Relief & Bus Rapid Transit Projects Unit E will range from 0 to 7 feet. The deepest inundation will occur at the connection with Springbrook Creek. It is anticipated that Unit E will be inundated to 7 feet by Springbrook Creek flows for approximately 1 hour during the growing season. It is estimated that Elevation 10 will be inundated with water approximately 2 feet deep for 15 days during the growing season. Analysis of Unit E provides the hours of inundation for specific time periods, their associated elevations, and the percentage of period inundated for the current and future flows upstream of SW 34th Street. Proposed elevations of Unit E are based upon inundation and saturation during the growing season. The analysis indicates that areas up to 10.0 feet in elevation are seasonally inundated or saturated, and areas between 10.0 and 11.5 feet in elevation are irregularly inundated or saturated. Areas higher than 11.5 feet in elevation are intermittently or never inundated and therefore would likely be considered uplands. Four individual simulated events were selected to represent typical storms that can be expected during the early growing season (March through May) and during the remaining portion of the growing season (June through October). Inspection of the storm events shows that areas up to 9.5 feet in elevation (0 to 1.5 feet deep) are inundated or>saturated `for approximately 4 to 6.5 days. Areas up to 10.5 feet in elevation (0 to 2.5 feet) are inundated or saturated for approximately 1 to 2.5 days. Areas up to Elevation 11.5 (0 to<3.5 feet deep) are inundated or saturated for approximately 0.5 to 1.5 days. Flows will typically take 2.5 to 4.5 days to recede. 20050901 Springbrook Wetland Restoration Memo.doc Congestion Relief & Bus Rapid Transit Projects Introduction/Purpose The Washington State Department of Transportation (WSDOT) and the City of Renton are working together to establish the Springbrook Wetland and Habitat Mitigation Bank (the Bank). The Bank is comprised of five wetlands units: A, B, C, D, and E. This memorandum addresses the rehabilitation of Units A and B and re-establishment of wetlands at Unit E. Rehabilitation of Units A and B will be achieved by providing hydrologic connections with Springbrook Creek. Re-establishment of Unit E will depend on providing sufficient water to the site to establish vegetation typically found in saturated soil conditions. Unit E will depend primarily on flows entering the site from Springbrook Creek for its source of water. Unit C is addressed in a separate memorandum because it does not depend on Springbrook Creek as a source of hydrology. Instead, the hydrology of Unit C is characterized by using a water balance that includes stormwater runon volumes, piezometric data, infiltration, and evapotranspiration calculations (1-405 Corridor Program, 2005). u-� This memorandum describes the hydrologic modeling and analyses conducted to evaluate Springbrook Creek flows and support wetland hydrology in Units A, B, and E. This memorandum includes three parts: • Part I identifies the criteria and methodology which need to be met in order to receive mitigation credit. • Part II provides analysis and discussion of hydrology as it, pertains to supporting the rehabilitation of Units A and B and the re-establishment of Unit E. • Part III provides a summary and conclusion. I. Criteria and Project Methodology To receive mitigation credit, wetland functions in Units A, B, and E must be improved and project performance standards mustbe met. This will be achieved by rehabilitating the existing wetlands in Units A'and B and re-establishing wetlands in Unit E. Units A and B Wetland hydrology currently exists in Units A and B, but the wetlands are hydrologically disconnected from Springbrook Creek. Wetland rehabilitation is the dominant mitigation treatment within Units A and B and will be achieved by providing hydrologic connections between the existing wetlands and Springbrook Creek. It is anticipated that these connections will augment wetland hydrology in Units A and B, increase stream interaction with the floodplain, and potentially reduce the elevation and duration of peak flows in Springbrook Creek. Unit E Wetland hydrology currently does not exist at Unit E. Mitigation treatments for Unit E include wetland re-establishment, riparian enhancement, upland habitat enhancement, and buffer creation. To re-establish wetlands in Unit E, the definition of wetland hydrology must be met, assuming that the soil and vegetation parameters are achieved. The Washington State 20050901 Springbrook Wetland Restoration Memo.doc Congestion Relief & Bus Rapid Transit Projects Department of Ecology's 1997 Washington State Wetlands Identification and Delineation Manual and the Corps of Engineers' 1987 Wetland Delineation Manual defines wetlands as: Those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. To be considered a wetland, the following hydrologic criterion must be met: Areas which are seasonally inundated and/or saturated to the surface for a consecutive number of days greater than 12.5 percent of the growing season are wetlands provided the soil and vegetation parameters are met. Areas inundated or saturated between 5 percent and 12.5 percent of the growing season in most years may be wetlands. Areas inundated or saturated to the surface for less than 5 percent of the growing season are non -wetlands. Because individuals from different disciplines will review this document, terms in the definition above are clarified below: Inundation — A condition in which water from any source temporarily or permanently covers a land surface. Saturation — A condition in which all easily drained voids (pores between soil particles) in the root zone are temporarily or permanently filled with water to the soil surface at pressures greater than atmospheric. ON Growing Season - The growing seaseits the portion of the year when soil temperatures at 19.7 inches below the soil surface are higher than biologic zero (51 C). For western Washington the mesic growing season is often considered to be approximately March 1 to October 31 (245 days). Duration — The length of time during which water stands at or above the soil surface (inundation), or during which time the soil is saturated. Frequency — The periodicity of coverage of an area by surface water or soil saturation. To determine the extent of the inundation and the duration of Springbrook Creek flows, the Hydrologic Simulation Program — FORTRAN (HSPF) program was used. HSPF is a continuous time series hydrologic program that can be used to investigate a wide range of hydrologic conditions such as low flow conditions, flow durations, and length of inundation. HSPF is used extensively in western Washington by King County Water and Land Resources, the United States Geological Society (USGS), and engineering consultants to assess effects of changes in a drainage basin over time. 20050901 Springbrook Wetland Restoration Memo.doc Congestion Relief S Bus Rapid Transit Projects The Springbrook Creek model was used to support the City of Renton's floodplain re -mapping study, a part of the recent Federal Emergency Management Agency (FEMA) floodplain mapping revision (Hartley and Stewart, 2004). A continuous hourly precipitation record from Seattle - Tacoma International Airport (NWS gage 7473 at Sea-Tac) for water years 1949 to 2001 was used to generate 53 years of continuous flow in Springbrook Creek. The model was calibrated to streamflow data from water years 1995 and 1996 using land use, channel, and basin storage conditions (Hartley and Stuart, 2004). Storms were typically large and numerous during the calibration period, making this a very good period for calibrating (Hartley and Stuart, 2004). For the Springbrook Wetland and Habitat Mitigation Bank project, the model was updated with recently surveyed stream cross sections. The updated model was used to evaluate current and future flow conditions in Springbrook Creek. The current flow conditions were based on: (a) the 1999 land use designations determined from aerial photography of the drainage basin, and (b) the anticipated near -term conveyance improvements, including replacing the culvert at SW 34th Street and connecting the proposed Unit E wetland to Springbrook Creek. The future flow condition consists of current condition near term conveyance improvements, removing the bridge north of SW 27th Street, and replacing the culvert at the intersection of SW 41 st Street and Oakesdale Avenue SW. The future land use scenario represents the maximum development allowed under the City of Renton zoning ordinances in place at the time of the 2001floodplain mapping study. Unit E improvements were included in all model runs. The two modeled scenarios provide anticipated conditions at the sites when the project is completed and the anticipated buildout conditions for channel improvements: along Springbrook Creek. Note that analysis of current and future conditions does not provide an evaluation of the impacts or benefits of the proposed project. II. Analysis anSC s�sion The extent of the Inundation111" :the duration of Springbrook Creek flows were evaluated at three locations forte current a future conditions. The three locations (Figure 1) are: 1. Upstream of SW 27th Street (adjacent to Units A and B) 2. Upstream of SW 34th Street (located just north and downstream of Unit E) 3. Downstream of Oakesdale Avenue SW (located just south and upstream of Unit E) The analysis for each location included counting the number of times (events) that the water surface exceeded a certain elevation (inundation), and for how long it remained at that elevation (duration). For example, the analysis could tell the investigator that Elevation 11 was exceeded 36 times for 134 hours during the growing season at Location 1. This type of analysis is often referred to as an event -stage (elevation) -duration analysis and can be achieved only by using a continuous time series program. The analysis cannot predict how long an area will be continuously inundated or saturated. To address the continuous inundation question, a second analysis is necessary and is discussed in the second part of this section. 20050901 Springbrook Wetland Restoration Menno.doc 5 Congestion Relief & Bus Rapid Transit Projects 11.1 Event - Stage - Duration Analysis Units A and B Event — stage — duration analyses for Units A and B are based on the 53-year continuous record of Springbrook Creek flows upstream of SW 27th Street. Table 1 provides current condition information about the hours and days of inundation in half -foot increments up to Elevation 12, and in 1-foot increments from Elevations 13 to 16, for four time periods. The table also lists the corresponding plant zones proposed for each elevation range. Plants will not be installed at a given elevation if the plant community is not identified in the plant zone column. For Units A and B, no plantings are anticipated below Elevation 12 along Springbrook Creek. The proposed plantings for Units A and B are shown in the attached drawings WM1, WM2, WM3, and WM4. Table 2 provides the future conditions hours and days of inundation by elevation for specific seasons and proposed plant communities. Tables 3 and 4 present the expected hours of inundation, expressed as a percent of the time periods upstream of SW 27th Street under current and future conditions, respectively. The time periods listed in Tables 1 through 8 are: (a) annual, (b) the growing season (March — October), (c) the early growing season (March — May), and'(d) from June through August. Subdividing the information into different time periods helps illustrate changes in Springbrook Creek hydrology overtime. Tables 1 through 4 show that the hours and days of inundation are reduced as the elevation increases. The hours of inundation are also reduced as the time period is reduced from the annual period to a smaller JuMure August time period. It is also noted that the change between the current condition and the. condition is insignificant. This is most easily observed when comparing the current (Table utiare (Table 4) percent inundation. Except for elevation range 7.0 to 7.5, which represents a Springbrook Creek bed, the change in percent inundation between the two conditions is ,1 pe, nt or less. The proposed levee breaches at Units A and B are set at the 12-foot elevation to provide the necessary hydrologic connections with Springbrook Creek. This proposed elevation is based on the elevations of existing delineated wetlands located behind the levee. It is anticipated that these connections will augment wetland hydrology in Units A and B, increase stream interaction with the floodplain, and reduce the elevation and duration of Springbrook Creek's peak flows. Per Table 1, it is anticipated that areas at Elevation 12 will be inundated for 77 hours (3.2 days) annually, for approximately 14 hours during the growing season, and for 8 hours during the early growing season (March through May). The depth of flows at Elevation 12 will range from 0 to 5 feet. From Table 2, areas at Elevation 12 will be inundated approximately 114 hours (4.8 days) during the year, and 23 hours (1 day) during the growing season. 20050901 Springbrook Wetland Restoration Memo.doc Congestion Relief S Bus Rapid Transit Projects Table 1 - Predicted Hours (Days) Inundation of Wetland Mitigation Sites (Units A and B) under Current Conditions - Upstream of SW 27th Street P � � OR ftle r s� lev 71964 4,274 2,193 1,853 - 7.5 331.8 178.1 91.4 77.2 2,485 908 541 114 - 8 103.5 37.8 22.5 4.8 11454 488 265 53 - 8.5 60.6 20.3 11.0 2.2 976 322 163 32 - 9 40.7 13.4 6.8 1.3 674 216 101 20 - 9.5 28.1 9.0 4.2 0.8 473 149 66 13 - 10 19.7 62 2.8 0.5 323 101 41 8 - 10.5 (13.5) 4.2 1.7 0.3 212 65 23 5 - 11 8.8 2.7 1.0 0.2 137 41 14 3 - 11.5 5.7 1.7 0.6 0.1 77 14 8 2 Wetland Shrub #2 12 3.2 0.6 0.3 0.1 21 4 3 0 Wetland Shrub #2 13 0.9 0.2 0.1 0.0 3 1 0 0 Wetland Shrub #2 14 0.1 0.0 0.0 0.0 0 0 0 0 Riparian 15 0.0 0.0 0.0 0.0 0 0 0 0 Riparian 16 0.0 0.0 0.0 0.0 0 0 0 0 Riparian 20 0.0 0.0 0.0 0.0 1 year is approximately 8,760 hours (365 days). Growing season is approximately 5,580 hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 days). 20050901 Springbrook Wetland Restoration Memo.doc Congestion Relief & Bus Rapid Transit Projects Table 2 - Predicted Hours (Days) Inundation of Wetland Mitigation Sites (Units A and B) under Future Conditions - Upstream of SW 27th Street wv "ours (days) Inundated May llr'9eason' ` oMarch'- (Early June - arch growing August season) 7,085 4,274 2,163 1,309 7 5 295.2 178.1 90.1 54.5 2,467 908 529 121 8 102.8 37.8 22.0 5.0 1,511 488 277 60 - 8.5 63.0 20.3 11.5 2.5 1,067 322 180 40 9 44.5 13.4 7.5 1.7 766 " 216 118 26 - 9.5 31.9 9.0 4.9 1.1 559 149' 81 18 - 10 23.3 6.2 3.4 0.8 401 101 54 13 - 10.5 167 4.2 2.3 0.5 276 65 ''' 33 8 11 11.5 2.7 1.4 0.3 188 41 20 5 - 11.5 7.8' 1.7 0.8 0.2 114 23 11 3 Wetland Shrub #2 12 4.8)`` (1.0) (0.5) (0.1) Wetland Shrub #2 13 35 (1.5) 7 (0.3) 4 (0.2) 1 (0.0) 7 2 1 0 Wetland Shrub #2 14 (0.3) (0.1) (0.0) (0.0) 1 0 0 0 Riparian 15 (0.0) (0.0) (0.0) (0.0) Riparian '; 16 0 (0.0) 0 0.0) 0 (0.0) 0 (0.0) 0 0 0 0 Riparian 20 (0.0) (0.0) (0.0) (0.0) 1 year is approximately 8,760 hours (Jbb clays). crowing season is approxirudwiy o,00u hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 days). 20050901 Springbrook Wetland Restoration Memo.doc 8 Congestion Relief & Bus Rapid Transit Projects Table 3 — Predicted Percent Inundation of Wetland Mitigation Sites (Units A and B) under Current Conditions — Upstream of SW 27th Street er , nt IrlEdaf NMI one Pa , �/H /yif' /� / � / 9 kA� if l 3��/��i��{ W 64%/ Q �% �3k / T .✓' .l ! �i3 f June - ��% A°grow ' August 11,E, oing rch-Oct ber) y� o se asn) A.. - 7.5 91 % 73% 99% 84% - 8 28% 15% 25% 5% - 8.5 17% 8% 12% 2% - 9 11% 5% 7% 1% - 9.5 8% 4% 5% 1 % - 10 5% 3% 3% 1% - 10.5 4% 2% 2% 0% - 11 2% 1% . 1% 0% - 11.5 2% 1% 1% 0% Wetland Shrub #2 12 1 % 0%"" 0% 0% Wetland Shrub #2 13 0% 0% 0% 0% Wetland Shrub #2 14 0% 0% 0% 0% Riparian 15 0% 0% 0% 0% Riparian 16 0% 0% 0% 0% Riparian 20 0% 0% 0% 0% 1 year is approximately 8,760 hours (365 days). Growing season is approximately 5,580 hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 days). 20050901 Springbrook Wetland Restoration Menno.doc Congestion Relief & Bus Rapid Transit Projects Table 4- Predicted Percent Inundation of Wetland Mitigation Sites (Units A and B) under Future Conditions — Upstream of SW 27th Street Percent Inundation y Growing March -May r, $ nual Season (Early'. (March- growing y October) season) 81 % 73% 98% 59% - 7.5 - 8 28% 15% 24% 5% - 8.5 17% 8% 13% 3% - 9 12% 5% 8% 2% - 9.5 9% 4% 5% 1% - 10 6% 3% 4% 1% - 10.5 5% 2% 2% 1% - 11 3% 1% 1% 0% - 11.5 2% 1% 1% 0% Wetland Shrub #2 12 1% 0% 0% 0% Wetland Shrub #2 13 0% 0% 0% 0% Wetland Shrub #2 14 0%° 0% 0% 0% Riparian �� 15 0% " 0% 0% 0% Riparian 16 "A :- 0% 0% 0% 0% Riparian .. 0%" 0% 0% 0% 1 year is approximately 8Z 760 h8' 'rs (365 days). Growing season is approximately 5,580 hours (232.5 days). March, April, dhd May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 d IN4 20050901 Springbrook Wetland Restoration Memo.doc 10 Congestion Relief & Bus Rapid Transit Projects Unit E Event — stage — duration analyses for Unit E are based on the 53-year continuous record of Springbrook Creek flows upstream of SW 34th Street. Similar to Tables 1 and 2, the information in Table 5 and 6 provides the current and future condition hours and days of inundation in half -foot increments up to Elevation 12, and in 1-foot increments from Elevations 13 to 16, for four time periods respectively. The time periods are identical to those provided for Units A and B. The table also provides the corresponding plant zones proposed for each elevation. The proposed plantings for Unit E are shown in the attached drawings WM11 and WM12. Similar to the analysis for Units A and B, there is little change in the hours of inundation between the current and future conditions. The most significant change between the two conditions occurs in area less than 8.5 feet in elevation, which occur at the connection with Springbrook Creek. Changes for higher elevations are on the order of 1 percent of the period or less. The event -stage -duration analyses of Springbrook Creek for current and future conditions at Unit E indicate that: • Areas below 8 feet in elevation will be permanently inundated. The areas at this elevation are associated with the Springbrook Creek stream channel at Unit E. • Areas between 8 and 8.5 feet in elevation will be inundated approximately 26 to 29 percent (approximately 71 to 165 days) of the growing season and almost half of the early growing season. The depth of water at the site will range from 0 to 0.5 feet. • Areas from 8.5 to 9 feet in elevation will be inundated 14 percent of the growing season (approximately 33 days) and approximately one -fifth of the early growing season. The depth of water will range from 0 to 1 foot. • Areas from 9 to 105 feet in elevation will be inundated 4% of the growing season (approximately 8.5 to 10 days). Depth of water will range from 0 to 2.5 feet. • Elevations above 610.5 feet in elevation will be inundated less than 4 percent (8.5 to 10 days) of the growing season and about a tenth of the early growing season. Depth of water will range from 0 to 7 feet at its deepest point. This point occurs for approximately 1 hour during the growing season. 20050901 Springbrook Wetland Restoration Memo.doc 11 Congestion Relief & Bus Rapid Transit Projects Table 5 - Predicted Hours (Days) Inundation of Wetland Mitigation Sites (Unit E) under Current Conditions - Upstream of SW 34th Street y� Hours (days) inundated yk ' Vation t Growing March - May NAVi'88) Annual, Season (Early (March- growing June - August :October) season) 8,764 5,866 2,208 2,208 - 8 365.2 244.4 92.0 92.0 3,908 1,711 1,034 258 Wetland Shrub #2 8.5 162.8 71.3 43.1 10.8 Wetland Shrub #2 9 2,250 798 474 100 93.8 33.3 19.8 4.2 1,604 516 300 62 Wetland Shrub #1 9.5 66.8 21.5 12.5 2.6 Wetland Shrub #1 10 1,105 326 189 37 46.0 13.6 7.9 1.5 759 206 117 24 Wetland Shrub #1 10.5 31.6 8.6 4.9 1.0 508 128 72 15 Wetland Shrub #1 11 21.2 '' 5.3 3.0 0.6 Wetland Shrub #1 11.5 337 14.0 77 3.2 43 1.8 9 0.4 Wetland Shrub #1 12 214 8.9 44 1.8 23 1.0 5 0.2 Upland (Forest or 13 66 12 7 1 Riparian) (2.8) (0.5) (0.3) (0.0) Upland (Forest or 14 14 3 2 0 Riparian) (0.6) (0.1) (0.1) (0.0) Upland (Forest or 15 2 0 0 0 Riparian) (0.1) (0.0) (0.0) (0.0) Upland (Forest or 16 0 0 0 0 Riparian) (0.0) (0.0) (0.0) (0.0) Upland (Forest or 20 0 0 0 0 Riparian) (0.0) (0.0) (0.0) (0.0) 1 year is approximately 8,760 hours (365 days). Growing season is approximately 5,580 hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 days). 20050901 Springbrook Wetland Restoration Memo.doc 12 Congestion Relief & Bus Rapid Transit Projects Table 6 - Predicted Hours (Days) Inundation of Wetland Mitigation Sites (Unit E) under Future Conditions - Upstream of SW 34th Street . �N Hours (days) Inundated , May s Orly June - August un� 5li' d, 9 „s9 `S�,:S,if %/.'' a./ � .Ml season) �55i •i✓y�k..„-, _ 8 8,763 5,866 2,208 2,208 365.1 244.4 92.0 92.0 Wetland Shrub #2 8.5 3,619 155 900 242 150.8 164.E 37.5 10.1 Wetland Shrub #2 g 2,241 807 466 106 93.4 33.6 19.4 4.4 Wetland Shrub #1 9.5 1,645 547'" 310 69 68.5 22.8 12.9 2.9 Wetland Shrub #1 10 1,178 364 203 45 49.1 15.2 8.5 '' 1.9 Wetland Shrub #1 10.5 845 244 ,',', ;- 133 30 35.2 10:2' 5.5 1.3 Wetland Shrub #1 11 592 160 86 20 24.7 '; 6.7 3.6 0.8 Wetland Shrub #1 11.5 413 (17.2) 105 4.4 55 2.3 13 0.5 Upland (Forest or 12 274 64 33 8 Riparian) 11.4 2.7 1.4 0.3 Upland (Forest or 13 96 20 9 2 Riparian) (4.0) (0.8) (0.4) (0.1) Upland (Forest or 14 24 5 3 0 Riparian) 1.0) (0.2) (0.1) (0.0) Upland (Forest or 15 4 1 0 0 Riparian) (0.2) (0.0) (0.0) (0.0) Upland (Forest or 16 0 0 0 0 Riparian) (0.0) (0.0) (0.0) (0.0) Upland (Forest or 20 0 0 0 0 Riparian) (0.0) (0.0) (0.0) (0.0) 1 year is approximately 8,760 hours (365 days). Growing season is approximately 5,580 hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 days). 20050901 Springbrook Wetland Restoration Memo.doc 13 Congestion Relief & Bus Rapid Transit Projects Table 7 — Predicted Percent Inundation of Wetland Mitigation Sites (Unit E) under Current Conditions — Upstream of SW 34th Street m Growing Season gg) A»n'ual - 8 100% 100% 100% 100% Wetland Shrub #2 8.5 45% 29% 47% 12% Wetland Shrub #2 9 26% 14% 21% 5% Wetland Shrub #1 9.5 18% 9% 14% 3% Wetland Shrub #1 10 13% 6%. 9% 2% Wetland Shrub #1 10.5 9% 4% 5% 1% Wetland Shrub#1 11 6% 2% 3%,.. 1% Wetland Shrub #1 11.5 4% 1% 2% 0% Upland (Forest or 12 2% 1% 1% 0% Riparian) Upland (Forest or o 1 /oT 0% 0% 0% Riparian)13 Upland (Forest or 14 0%` 0% 0% 0% Riparian) Upland (Forest or 15 0% 0% 0% 0% Riparian) Upland (Forest or 16 0%' 0% 0% 0% Riparian) Upland (Forest or 20 0% 0% 0% 0% Riparian) 1 year is approximately 8,760 hours (365 days)., Growing season is approximately 5,580 hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours (92 days). 20050901 Springbrook Wetland Restoration Memo.doc 14 Congestion Relief & Bus Rapid Transit Projects Table 8 — Predicted Percent Inundation of Wetland Mitigation Sites (Unit E) under Future Conditions — Upstream of SW 34th Street y re Percent Inundation AN, VOYR Growing h Marc Plant Zone ' a�E . ... Season dual (Early growinIs g (March season ; October) - 8 100% 100% 100% 100% Wetland Shrub #2 8.5 41 % 26% 41 % 11 % Wetland Shrub #2 9 26% 14% 21 % 5% Wetland Shrub #1 9.5 19% 9% 14% 3% Wetland Shrub #1 10 13% 6% 9% 2% Wetland Shrub #1 10.5 10% 4% 6% 1 % Wetland Shrub #1 11 7% 3% 4% 1 % Wetland Shrub #1 11.5 5% 2% 2% 1 % Upland (Forest or 12 3% 1 % 1 % 0% Riparian) Upland (Forest or 13 1 % 0% 0% 0% Riparian) Upland (Forest or 14 0% 0% 0% 0% Riparian) Upland (Forest or 15 0% 0% 0% 0% Riparian) Upland (Forest or 16 0% 0% 0% 0% Riparian) Upland (Forest or 20 0% 0% 0% 0% Riparian) 1 year is approximately 8,760 hours (365 days). Growing season is approximately 5,580 hours (232.5 days). March, April, and May represent 2,208 hours (92 days). June, July, and August represent 2,208 hours,(92 days)."' 20050901 Springbrook Wetland Restoration Memo.doc 15 Congestion Relief & Bus Rapid Transit Projects Saturation The event -stage -duration analysis described above is capable of predicting water surface elevations associated with Springbrook Creek hydrology. The analysis is not able to account for temporary or permanent saturation of the soils at Unit E. Soil saturation is based on capillary rise, which is a measure of the soil's ability to draw water above the water surface elevation. The amount of rise depends on the soil properties and the space (pores) between the individual particles of soil. Contiguous, small pores fill to a higher elevation above the water table than larger pores. Soils richer in organic matter draw water to a higher elevation than sandy, gravelly soils. Sandy soils with effective pore diameters of 0.01 centimeters (cm) can draw water 6 inches above the water table. A loam with effective pore space half that size (0.005 cm) draws water 12 inches above the water table. Some organic soils draw water 18 inches or more above the water table. Soil saturation information can typically be obtained from soil surveys or other similar sources. In this case, much of the material at the site is fill from previous construction activities. Recent geotechnical investigations at the site suggest that much of the material at the proposed grading elevations is expected to be silts with peat, silts to sandy silt, and brown peat with organic silts. The fill material at the site is generally characterized as silty sand and sand. It is assumed from this analysis that the materials found over the majority of the site after construction will be mostly silts capable of drawing water up 12 inches or more. Silty sand and sand fill materials on the side slopes of the wetland will be amended with organic material to establish the necessary planting and will be capable of drawing water 12 inches above the water table. This assumption is consistent with the Washington State Wetland Identification and Delineation Manual (Ecology, 1997), which states that for soil saturation to affect vegetation it must occur within the major rooting zone of the prevalent vegetation (usually within 12 inches of the surface). Hydrologic Zones With the eve nt-stage-duraflrn analysis and the saturation component established, the expected hydrologic zones can be identified. Table 9 shows the expected hydrologic zones adapted in the Corps of Engineers Wetland Delineation Manual (1987) from Clark and Benforado (1981). The information presented in Table 9 was based on the percent inundation information and adding 12 inches to the elevation to account for the influence of saturation. The following example is provided for clarity: From Table 9, the elevation corresponding to 6 percent inundation during the growing season is 10 feet. Adding 12 inches to the elevation provides saturated soils to Elevation 11 for approximately 6 percent of the growing season. The following table was constructed following this procedure. 20050901 Springbrook Wetland Restoration Memo.doc 16 Congestion Relief & Bus Rapid Transit Projects It 11 Table 9 — Unit E Hydrologic Zones Permanently inundated 100% Below 8.0 feet Semi -permanently to >75 % - <100% nearly permanently inundated or saturated III Regularly inundated or >25% - 75% saturated IV Seasonally inundated or >12.5% - 25% saturated V Irregularly inundated or 5% -12.5% saturated VI Intermittently or never <5% inundated or saturated * Zones adapted from Clark and Benforado (191 ** Refers to duration of inundation and/or soil sal *** Soil saturation assumes 12 inches of,capillary shown in Table 5, 6, 7 and 8. t This defines an aquatic habitat zone Areas up to 9.5 Areas between 9.5 and 10.0 Areas between 10.0 and 11.5 Areas above 11.5.. Wetland Shrub #2 Wetland Shrub #1 Wetland Shrub #1 Upland (Forest or Riparian) during the growing season. Jed to the inundation elevations Based on the hydrologic zones for Unit E (Table 9) and plant zones listed in Tables 5 though 8, wetland hydrology can be provided up to Elevation 11.5 feet. The lower elevations of Wetland Shrub Community #2 will be regularly inundated to seasonally inundated. Wetland Shrub Community #1 will be regularlytinundated to irregularly inundated. Upper elevations of the wetland shrub community are sown to be intermittently inundated, while the lower elevations of uplands are inundated less than intermittently or never inundated. 11.2 Continuous Duration Analysis A second analysis was performed to address how long will Unit E will be continuously saturated. A continuous duration analysis is not required for Units A and B since wetland hydrology already exists on site. The analysis examined four individual storm events at Unit E to determine the duration of typical Springbrook Creek flows at specific elevations. The storms represent conditions that can be expected during the early growing season (March through May and during the remaining portion of the growing season (June through October). Selection of these events was based on identifying the 2-year return period and the annual return period (1.01 percent exceedance). Figures 2 through 5 provide information about the continuous inundation that can be expected for an individual storm. 20050901 Springbrook Wetland Restoration Memo.doc 17 Congestion Relief & Bus Rapid Transit Projects Table 10 — Peak Flows for Selected Typical Storm Events cfs = cubic feet per second Upstream SW 34th Street and Oakesdale Avenue SW, March — May • March 11, 1996 with a peak simulated flood flow of 146 cfs, representing a moderate, more frequent event that is expected to be equaled or exceeded once a'year on average. • May 10, 2000 with a peak simulated flood flow of 274 cfsrepresenting a 2-year return period expected to be equaled or exceeded once eveZ years on average. Upstream SW 34th Street and Oakesdale Avenue SW, June — October • June 11, 2001 with a peak simulated flood flow of 231 cfs, representing a moderate, more frequent event that is expected to be equaled or exceeded once a year on average. • August 22, 2001 with a peak simulated flood flow of 380 cfs, representing a 2-year return period expected to be equaled or exceeded once every 2 years on average. Figures 2 through 5 show that frequent events will inundate areas up to an elevation of 8.5 feet (corresponding to a saturated elevation of 9.5 feet) for durations that range from 93 hours (3.9 days) to 157 hours (6.5 days). Surface flows will typically take 2 to 3 days to recede. The cumulative time corresponding to the inundation of the site to the recession of water from the site is expected to last from 5.9 days to 9.5 days. It is anticipated that in areas up to 9 feet in elevation (corresponding to a saturated elevation of 10.0 feet), frequent events will last from 23 hours (0.9 days) to 65 hours (2.7 days). Flows will typically take 2.5 to 3.5 days recede. The cumulative time would range from 3.4 days to 6.2 days. Areas up to Elevation 10.5 (corresponding to a saturated elevation of 11.5 feet) could typically be inundated from 10 hours (0.4 days) to 36 hours (1.5 days) in duration. Flows would typically take 3.5 to 4.5 days to recede. The cumulative time corresponding to the inundation of the site to the recession of water from the site is expected to last from 3.9 days to 6.0 days. While none of these storms last for 12.5 percent of the growing season (roughly 30 days), it is expected that the wetland areas would be frequently inundated or saturated to provide sufficient water to establish wetland hydrology between 5 percent and 12.5 percent of the growing season 20050901 Springbrook Wetland Restoration Memo.doc 18 Congestion Relief S Bus Rapid Transit Projects It should be noted that the slow recession of water from Unit E should allow any fish seeking refuge during higher flows ample time to respond and remain in deep water, provided that the sites are graded to drain toward Springbrook Creek, and avoid any isolated water that is not hydrologically connected to Springbrook Creek. III. Summary and Conclusion To receive mitigation credit, Units A and B were designed to provide a more effective hydrologic connection to Springbrook Creek by providing a number of breaches through the levee. The design and success of Unit E depends on inundation and saturation by Springbrook Creek flows. Success is defined as the ability to provide the inundation and duration sufficient to establish vegetation typically adapted for life in saturated soil conditions. To address inundation and duration during the growing season and other seasonal periods, an HSPF program was used to model Springbrook Creek current and future hydrology conditions at locations adjacent to Units A, B, and E. Continuous inundation is addressed by the inspection of typical storm events and the duration of inundation at specific elevations. Analysis of Units A and B demonstrates that modifying the existing levee with breaches will provide hydrologic connections between the existing wetlands and Springbrook Creek, augment the wetland hydrology in Units A and B, increase stream interaction with the floodplain, and potentially reduce the elevation and duration of Springbrook Creek peak flows. Analysis of Unit E provides the hours of inundation for specific time periods, their associated elevations, and the percentage of period inundated for the current and future flows upstream of SW 34th Street. Proposed elevations of Unit E are based upon inundation and saturation during the growing season. The analysis indicates that areas up to 10.0 feet in elevation are seasonally inundated or saturated, and areas between 10.0 and 11.5 feet in elevation are irregularly inundated or saturated. Areas higher than 11.5 feet in elevation are intermittently or never inundated and there fiora would likely be considered uplands. Four individual simulated events were selected to represent typical storms that can be expected during the early growing season (March through May) and during the remaining portion of the growing season (June through October). Inspection of the storm events shows that areas up to 9.5 feet in elevation (0 to 1,.5 feet deep) are inundated or saturated for approximately 4 to 6.5 days. Areas up to 10.5 feet in elevation (0 to 2.5 feet) are inundated or saturated for approximately 1 to 2.5 days. Areas up to Elevation 11.5 (0 to 3.5 feet deep) are inundated or saturated for approximately 0.5 to 1.5 days. Flows will typically take 2.5 to 4.5 days to recede. 20050901 Springbrook Wetland Restoration Memo.doc 19 Congestion Relief & Bus Rapid Transit Projects References Clark, J. R., and Benforado, J., eds. 1981. Wetlands of Bottomland Hardwood Forests, Proceedings of a Workshop on Bottomland Hardwood Forest Wetlands of the Southeastern United States. Elsevier Scientific Publishing Company, New York. Environmental Laboratory. (1987). Corps of Engineers Wetlands Delineation Manual, Technical Report Y-87-1, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS. Hartley, David and Derek Stuart, 2004, Hydrologic Analysis for Floodplain Mapping Study of Springbrook Creek, King County, Washington. northwest hydraulic consultants. Memorandum. Tukwila, Washington. 1-405 Corridor Program. 2005. Springbrook Wetland and Habitat Mitigation Bank: Unit C Water Balance Memorandum. WSDOT 1-405 Corridor Program, Bellevue, WA. Washington State Department of Ecology, 1997. Washington State Wetlands Identification and Delineation Manual. Publication #96-94. 20050901 Springbrook Wetland Restoration Memo.doc 20 kingcountyjournal.com - Wetland mitigation bank progressing, but slowly: Agreement key to wo... Page 1 of 2 KING I COUNT CL 11 MARKED 0 u r n a 1,krollcountyioumallacom .#ado Archive I Mytowfn I Ctassifieds I Home Dellvery I Advertising I Contact Us Home News Wetland mitigation bank progressing, Business but slowly: Agreement key to work on Prep ports I-405, SR 167 Opinion Obituaries 2006-05-22 Paid by Dean A. Radford Obituaries Journal Reporter Milestones Living Federal approval of a wetland mitigation bank that's critical to the Interstate 405 King County. Entertain. widening project is taking longer than expected, in part because of a new federal Newspapers Women's requirement that someone maintain the wetlands forever. hwic Not Journal That task could fall to the city of Renton, which owns the 131 acres for the bank Site Map in south Renton just west of State Route 167 and north of Ikea. Search Archive The Springbrook Creek Wetland and Habitat Mitigation is the first public wetland bank in Western Washington. Its beauty is that it will preserve large tracts of World News wetlands that have value as habitat and flood storage. MoneyWire And the bank allows the state Department of Transportation to have working wetlands in place to replace those it damages or destroys for its I-405 projects. Myto n Classifieds Agreements between the city and the transportation department say the state will Special maintain the wetland bank during ' 'the early years." After that, future KIN maintenance falls on the city, according to Stacy Trussler, the I-405 project Features manager for the state. Traffic The U.S. Army Corps of Engineers, the federal agency reviewing the project, Weather wants assurances someone will have money on hand to maintain the wetlands. It's solution is an endowment fund to pay for maintenance in perpetuity. Lotto Crossword The amount of the fund is still under discussion by the corps, the state and the Dilbert city of Renton. Horoscope Movies However, the corps has required that a Woodinville man establish a $150,000 Komo TV endowment fund, accumulated over several years, for his private 225-acre TV Listings mitigation bank in south Snohomish County. Home The money would come from $1,250 charged for each of the bank ' 'credits." The owner, Victor Woodward, earlier estimated that each credit would cost about Delivery $160,000. Advertising Jobs with Us Talks are continuing on the Renton endowment fund and some legal issues related Print with Us to the final agreement. All the agreements needed to start work on the wetland About Us bank are expected to be signed in June or July. Contact Us Initially, Renton officials thought the agreement would go to the City Council for approval in March. http://www.kingcountyjoumal.com/sited/story/html/258204 5/22/2006 kingcountyjournal.com - Wetland mitigation bank progressing, but slowly: Agreement key to wo Page 2 of 2 ' ' We thought we had a pretty good agreement," said Ron Straka, supervisor of the city of Renton's Surface Water Utility. The city has worked on the mitigation bank for about two years. However, the corps' requirements are evolving because the concept of these large mitigation banks is new, according to corps spokeswoman, Patricia Graesser. It's important, that the corps have consistent requirements for the banks, both private and public, she said. The state transportation department will spend $10 million to construct and enhance the wetlands. The state and city will split the bank's 45 credits with the city of Renton, which could use them for its own local road projects. A credit roughly corresponds to an acre of wetland, but it varies depending on the quality of the wetland that's to be replaced. Trussler, with the transportation department, expects the I-405 expansion project will go to bid late this summer or in the fall. ' ' We are on or ahead of schedule," she said. The project through Renton entails widening Interstate 405 and part of State Route 167 near its intersection with I-405. The state is planning to spend about $236 million on this projects and on large projects on Interstate 5 and State Route 169 between Renton and Maple Valley. Dean Radford can be reached at 253-872-6719 or dean.radford@ kingcountyjournal.com Eastside: King County Journal 11400 S.E. 8th St. Suite 450 Bellevue, WA 98004 Phone: (425) 455-2222 Fax: (425) 453-4193 South County: King County Journal 600 Washington Ave. South Kent, WA 98032 Phone: 253-872-6600 Fax: 253-854-1006 All materials Copyright @ 2006 Horvitz Newspapers, Inc. Any questions? See our contact age. http://www.kingcountyjoumal.com/sited/story/html/258204 5/22/2006