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17-105489-Critical Area Mitigation Plans-12-21-2023-V4Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonCRITICAL AREAS OVERVIEWVICINITY MAP (NTS) SOURCE: ESRI WORLD TOPOGRAPHIC MAP AND HILLSHADE ACCESSED 01-04-2023 Project Site REVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.0 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023019038057095 Feet SCALE: 1" = 190' CONTACTS APPLICANT/OWNER NAME: ADDRESS: PHONE: CONTACT: EMAIL: ARCHITECT NAME: ADDRESS: PHONE: CONTACT: EMAIL: SURVEYOR/ENGINEER NAME: ADDRESS: PHONE: CONTACT: EMAIL: ENVIRONMENTAL CONSULTANT NAME: ADDRESS: PHONE: CONTACT: EMAIL: FEDERAL WAY CAMPUS, LLC 4020 KINROSS LAKES PARKWAY, SUITE 200 RICHFIELD, OH 44286 (330) 659 - 4060 COBY HOLLEY CHOLLEY@IRGRA.COM NELSON 1200 FIFTH AVENUE, SUITE 1300 SEATTLE, WA 98101 (206) 408 - 8500 KATHY CRAFT KCRAFT@NELSONWW.COM ESM CONSULTING ENGINEERS 33400 8TH AVENUE SOUTH, SUITE 205 FEDERAL WAY, WA 98003 (253) 838 - 6113 ERIC LABRIE, AICP ERIC.LABRIE@ESMCIVIL.COM WET.LAND 8201 164TH AVE NE, SUITE 200 REDMOND, WA 98052 (206) 309 - 8100 JENNIFER MARRIOTT, PWS JEN@WET.LAND SHEET INDEX SHEET NUMBER AND SHEET TITLE W1.0 W1.1 W1.2 W1.3 W1.4 W1.5 W1.6 W1.7 W1.8 W1.9 W1.10 W1.11 W2.0 W2.1 W3.0 W3.1 W4.0 CRITICAL AREAS OVERVIEW PLAN PROJECT SITE OVERVIEW EXISTING CONDITIONS PLAN EXISTING CONDITIONS PLAN PROPOSED IMPACTS & MITIGATION OVERVIEW PLAN PROPOSED IMPACTS & MITIGATION OVERVIEW PLAN PROPOSED IMPACTS & MITIGATION PROPOSED IMPACTS & MITIGATION PROPOSED IMPACTS & MITIGATION ENLARGEMENT PROPOSED IMPACTS & MITIGATION ENLARGEMENT PROPOSED IMPACTS & MITIGATION ENLARGEMENT PROPOSED IMPACTS & MITIGATION SUMMARY TABLE FENCING PLAN & DETAILS GRADING SPECIFICATIONS PLANT SCHEDULE AND DETAILS PLANTING SPECIFICATIONS PERFORMANCE MONITORING PLAN NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. ,,,,,,,,,,,,,WL-EI WL-EJ WL-EK WL-EM WL-EL WL-FE WL-GB NORTH WL-DE WL-DK WL-DG WL-DF WL-DH WL-DI WL-AV WL-BS NORTH WL-FD WL-FF WL-FB WL-CG WL-BA WL-BD NORTH WL-BK WL-BF WL-BEWL-BL WL-BN WL-BJ WL-CN WL-AG WL-BR WL-BS SOUTH WL-AH WL-AF WL-AE STREAM AC STREAM GC WL-GB SOUTH WL-AI WL-KH WL-KMWL-KL WL-KIWL-KJ WL-KK WL-AJ WL-KF WL-AO WL-KN WL-AL WL-KD WL-KC WL-KB WL-AR WL-AS WL-AM WL-KA WL-KT WL-KU WL-KV WL-KW WL-IA WL-FC WL-CB WL-CD WL-BA 2 WL-PK WL-BB NORTH LAKEExisting Stormwater Pond Surveyed OHWMWEYERHAEUSER WAY SS 336TH STREETINTERSTATE 5LEGEND Project Site 2 ft Contours Parcel Boundaries Shoreline Management Zone (200') Wetlands Standard Wetland Buffer Stream OHWM ,,,Stream Centerline Standard Stream Buffer ,,,Ditch Centerline North Lake Ordinary High Water Mark North Lake (25' Buffer not shown) Managed Forest Buffer CRITICAL AREAS OVERVIEW PLAN PARCEL 1621049056 PARCEL 1621049036 PARCEL 1621049013 PARCEL 1621049030 PARCEL 2285000010 PARCEL 1521049178 PARCEL 7978200515 PARCEL 2121049002 PARCEL 2154650170 PARCEL 2154650080 PARCEL 2154650110 PARCEL 2154650160 PARCEL 7978200480 ,,,,,,,,,,,,,,,,,,,,Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROJET SITE OVERVIEWREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.1 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 0 300 600 900150 Feet SCALE: 1" = 300' LEGEND Previous Project Site (Before BLA) Easements Stream OHWM ,,,Stream Centerline ,,,Ditch Centerline North Lake Ordinary High Water Mark Wetlands Stormwater Pond North Lake (25' Buffer not shown) PROJECT SITE OVERVIEW LEGEND Project Site Study Area (225') Easements Stream OHWM ,,,Stream Centerline ,,,Ditch Centerline North Lake Ordinary High Water Mark Wetlands Stormwater Pond North Lake (25' Buffer not shown) Wetlands No Longer in Project Site or Study Area NORTH LAKE WEYERHAEUSER WAY SS 336TH STREETINTERSTATE 5NORTH LAKEINTERSTATE 5WEYERHAEUSER WAY SS 336TH STREET Previous Project Site This previous project site reflected old property boundaries prior to approval of Boundary Line Adjustments (BLA) through the City of Federal Way. Wetlands previously identified within the "Previous Project Site" are marked with an "X" on the table to the right. Current Project Site This current project site reflects current parcel boundaries following BLA approvals. Wetlands identified within the "Current Project Site" and " Current Study Area (225')" are marked with an "X" on the table to the right. CRITICAL AREAS COMPARISON TABLE 2017 (USACE)2018 (City) 2019 (Resub to City) April 2020 (Resub to City) May 2020 (Resub to USACE) 2021 (Resub to City) Current Project Site (Feb 2023) Current Study Area (225') AE X X X X X X X AF X X X X X X X AG X X X X X X X AH X X X X X X X AI X X X X X X AJ X X X X X X AL X X X X X X AM X X X X X X AO X X X X X X AR X X X X X X AS X X X X X X AV X X X X X X X BA X X X X X BA 2 X X X X X X BB X X X X X BD (N)X X X X X X BE X X X X BF X X X X BJ X (now PG)X X X BK X X X X BL X X X X BN X BR X X X X X X X BS (N)X X X X X X X BS (S)X X X X X X X CB X X X X CG X X X X X X X CN X DE X X X X X X X DF X X X X X X X DG X X X X X X X DH X X X X X X X DI X X X X X X X DK X X X X X X X EI X X X X X X X EJ X X X X X X X EK X X X X X X X EL X X X X X X X EM X X X X X X X FB X X X X X X X X FC X X X X FD X X X X X X X FE X X X X X X X FF X X X X X X X GB (N)X X X X X X X GB (S)X IA X X X X X X KA X X X X X X KB X X X X X X KC X X X X X X KD X X X X X X KF X X X X X X KH X KI X KJ X X KL X X KK X KM X KN X X X X X X KT X X X X X X KU X X X X X X KV X X X X X X KW X X X X X X PK X X X X X X STREAM AC X X X X X X STREAM GC X X X LOCATION Wetland Referenced in the Report Referenced in Report but as outside of Project Area OR referenced in Appendix NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. ,,,,,,999999 99999 9999999 99999999 99 99 99 9999 99 999 999 9 999 9999 99 9 999 99 9999 999999 99996'10'11'13' 16' 22'25'3 8 ' 40' 40' 40' 47' 50' 60' 60' 60' 60' 60'60'60' 60'60'60'60' 60'60'60' 6 0 ' 8 0 ' 80' 80'80'100'105'105'150' 165'Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonEXISTING CONDITIONS PLANREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.2 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 0 100 200 30050 Feet SCALE: 1" = 100' LEGEND Project Site 2 ft Contours Utility Easements Shoreline Management Zone (200') Wetlands Standard Wetland Buffer Stream OHWM ,,,Stream Centerline Standard Stream Buffer ,,,Ditch Centerline North Lake Ordinary High Water Mark North Lake Managed Forest Buffer EXISTING CONDITIONS PLAN MATCHLINE TO W1.3 WL-EI 175 SF Flags 1-4 40' Standard NA Reduced WL-EJ 231 SF Flags 1-5 60' Standard NA Reduced WL-EK 179 SF Flags 1-5 60' Standard NA Reduced WL-EM 306 SF Flags 1-5 60' Standard NA Reduced WL-EL 372 SF Flags 1-3, 97-100 60' Standard NA Reduced WL-FE 324 SF Flags 1-6 105' Standard NA Reduced WL-GB NORTH 3,377 SF Flags 1-12 60' Standard 45' Reduced WL-DE 21,554 SF Flags 1-81 60' Standard 45' Reduced WL-DK 6,332 SF Flags 1-40 60' Standard 45' Reduced WL-DG 1,103 SF Flags 1-8 60' Standard 45' Reduced WL-DF 81 SF Flags 1-5 60' Standard 45' Reduced WL-DH 271 SF Flags 1-5 60' Standard 45' Reduced WL-DI 227 SF Flags 1-4 60' Standard 45' Reduced WL-AV 12,150 SF Flags 1-77 60' Standard 45' Reduced WL-BS NORTH 2,683 SF Flags 1-9 60' Standard NA Reduced WL-FD 686 SF Flags 1-6 40' Standard NA Reduced WL-FF 978 SF Flags 1-5 40' Standard NA Reduced WL-FB 7,353 SF Flags 1-14 60' Standard 45' Reduced WL-CB 105' Standard NORTH LAKE Existing trails WEYERHAEUSER WAY SINTERSTATE 5Existing parking lotsExisting parking lotsExisting parking lots INSET MAP SCALE: 1" = 1,000' W1.2 W1.3 NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. ,,,,,,,,,,,,,,,99 99 99 999999 9999 9999 9 9999 999999999999 9 9 99 99999 99999 99 9 9999940' 40' 22' 40' 36' 40' 40' 40' 40' 45' 50'52'60' 60 '60'60'80'80'100' 105' 1 3 8 ' 15 0 ' 150'Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonEXISTING CONDITIONS PLANREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.3 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 0 100 200 30050 Feet SCALE: 1" = 100' LEGEND Project Site 2 ft Contours Utility Easements Shoreline Management Zone (200') Wetlands Standard Wetland Buffer Stream OHWM ,,,Stream Centerline Standard Stream Buffer ,,,Ditch Centerline North Lake Ordinary High Water Mark North Lake Managed Forest Buffer EXISTING CONDITIONS PLAN MATCHLINE TO W1.2 WL-AG 7,291 SF Flags 1-41 60' Standard 45' Reduced WL-BR 2,211 SF Flags 1-15 105' Standard 78.75' Reduced WL-AH 711 SF Flags 1-10 60' Standard 45' Reduced WL-AF 473 SF Flags 1-6 60' Standard 45' Reduced WL-AE 239 SF Flags 1-6 60' Standard 45' Reduced STREAM AC 100' Standard NA Reduced WL-BL 80' Standard WL-CN 80' Standard NORTH LAKE Existing Stormwater Pond Surveyed OHWMWEYERHAEUSER WAY SS 336TH STREET Existing trails Existing parking lotsExisting parking lotsExisting parking lots Standard Buffer (feet)25% Reduced Buffer (feet) 1 AE 60 45 2 AF 60 45 3 AG 60 45 4 AH 60 45 5 AV 60 45 6 BR 105 78.75 7 BS (N)60 NA 8 DE 60 45 9 DF 60 45 10 DG 60 45 11 DH 60 45 12 DI 60 45 13 DK 60 45 14 EI 40 NA 15 EJ 60 NA 16 EK 60 NA 17 EL 60 NA 18 EM 60 NA 19 FB 60 45 20 FD 40 NA 21 FE 105 NA 22 FF 40 NA 23 GB (N)60 45 24 STREAM AC 100 75 FWRC Chapter 19.145#Critical Area CRITICAL AREAS SUMMARY TABLE INSET MAP SCALE: 1" = 1,000' W1.2 W1.3 NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. ,,,,,, 99 999999 9999 9 99999 99 9 99999 999999 9999992'6'10'13' 16' 31 '47'47'50'50'52'60'60'60'60'60'60' 60'105'Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION OVERVIEW PLANREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.4 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 0 100 200 30050 Feet SCALE: 1" = 100' LEGEND Project Site Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Ditch Centerline ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts Clear and Grade Limits PROPOSED IMPACTS & MITIGATION OVERVIEW PLAN IMPACTS LEGEND Direct Wetland Impacts Inadequately Buffered Wetlands (Standard Setback) Buffer Reductions MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration MATCHLINE TO W1.5 WL-EI WL-EJ WL-EK WL-EM WL-EL WL-FE WL-GB NORTH WL-DE WL-DK WL-DG WL-DF WL-DH WL-DI WL-AV WL-BS NORTH WL-FD WL-FF WL-FB WL-CB NORTH LAKE Vault 1B Detention WEYERHAEUSER WAY S With ROW Improvements BUILDING 1INTERSTATE 5INSET MAP SCALE: 1" = 1,000',,,,W1.4 W1.5 Vault 1A Detention EXISTING BUILDING Detention Pond #2 Detention Pond #3 Per FWRC 19.145.160 a 5-foot building setback is required from the edges of critical area buffers. This building setback line is not shown on these plan sheets due to the scale, but at no point are buildings or structures proposed within the 5-foot building setback. NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. ,,,,,,,,,,,,,,99999 99999 99 99 9999 9999 999914' 53'54'60'60'65'80'80'90'100' 150 'Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION OVERVIEW PLANREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.5 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 0 100 200 30050 Feet SCALE: 1" = 100' MATCHLINE TO W1.4 WL-BL WL-CN WL-AG WL-BR WL-AH WL-AF WL-AE STREAM AC NORTH LAKEWEYERHAEUSER WAY S With ROW Improvements BUILDING 2 See Sheet W1.9 for Stream Restoration INSET MAP SCALE: 1" = 1,000',,,,W1.4 W1.5 Detention Pond #3 Detention Pond #4 Detention Pond #5 BUILDING 3 Surveyed OHWM S 336TH STREET WETLAND IMPACT SUMMARY TABLE LEGEND Project Site Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Ditch Centerline ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts Clear and Grade Limits PROPOSED IMPACTS & MITIGATION OVERVIEW PLAN IMPACTS LEGEND Direct Wetland Impacts Inadequately Buffered Wetlands (Standard Setback) Buffer Reductions MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration Pond #2 Outfall Pond #3 Outfall Pond #4 Outfall Pond #5 Outfall Per FWRC 19.145.160 a 5-foot building setback is required from the edges of critical area buffers. This building setback line is not shown on these plan sheets due to the scale, but at no point are buildings or structures proposed within the 5-foot building setback. NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. Direct (square feet)acres Indirect (square feet)acres (square feet)(acre) AE III 231 0.005 8 0.0002 239 0.0055 AF III 473 0.011 473 0.011 AG III 2,061 0.047 922 0.021 2,983 0.068 AH III 95 0.002 616 0.014 711 0.016 AV III 586 0.013 586 0.013 BS (N)III 2,683 0.062 2,683 0.062 DE III 115 0.003 4,712 0.108 4,827 0.11 EI IV 175 0.004 175 0.0040 EJ III 231 0.005 231 0.0053 EK III 179 0.004 179 0.0041 EL III 372 0.009 372 0.0085 EM III 306 0.007 306 0.0070 FD IV 686 0.016 686 0.016 FE III 324 0.007 324 0.0074 FF IV 978 0.022 978 0.022 (square feet)8,436 0.194 7,317 0.168 (acre)0.194 0.168 TOTAL See W1.11 for full proposed impacts and summary table. Critical Area 2014 ECY Rating Category Wetland Impact TOTAL 99 9931 '60'999999 9999 9 99999 99 99 9999 9999996'10'13' 16'47'47'50'50'52'60'60'60'60'60' 60',,,,,,,,,,,,,,,,,,99999 99999 9953'54'60'60'90'100'Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATIONREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.6 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 VIEWPORT A Scale: 1" = 40" VIEWPORTS B (LEFT) Scale: 1" = 50"; VIEWPORTS C (BELOW) Scale: 1" = 70" LEGEND Project Site Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Ditch Centerline ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts Clear and Grade Limits PROPOSED IMPACTS & MITIGATION IMPACTS LEGEND Direct Wetland Impacts Inadequately Buffered Wetlands (Standard Setback) Buffer Reductions MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration INSET MAP SCALE: 1" = 400' VIEWPORT A VIEWPORT B VIEWPORT C VIEWPORT D VIEWPORT E VIEWPORT F NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. 9 99 992'105'99 9999 65'80'150 '99 9914'80'Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATIONREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.7 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 INSET MAP SCALE: 1" = 400' VIEWPORT A VIEWPORT B VIEWPORT C VIEWPORT D VIEWPORT E VIEWPORT F VIEWPORT D Scale: 1" = 50" VIEWPORT F Scale: 1" = 40" LEGEND Project Site Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Ditch Centerline ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts Clear and Grade Limits PROPOSED IMPACTS & MITIGATION IMPACTS LEGEND Direct Wetland Impacts Inadequately Buffered Wetlands (Standard Setback) Buffer Reductions MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration VIEWPORT E Scale: 1" = 40" NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION ENLARGEMENTREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.8 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 VIEWPORT 1 - WETLAND FB Scale: 1" = 50" Wetland FB Buffer Reduction: 783 sf Buffer Replacement: 795 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +12 sf 99 9931 '60'Buffer Replacement Buffer Reduction VIEWPORT 2 - WETLAND GB - NORTH Scale: 1" = 50" Wetland GB - NORTH Buffer Reduction: 2,260 sf Buffer Replacement: 2,277 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +17 sf Buffer Restoration (Trail): 1,945 sf 999999 9950'50'52'60'Buffer Replacement Buffer Reduction VIEWPORT 3 - WETLAND DK Scale: 1" = 50" Wetland DK Buffer Reduction: 294 sf Buffer Replacement: 304 sf Upland Restoration (in Kind): 154 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +10 sf Buffer Restoration (Trail): 2,587 sf 9 99947'60' Buffer Replacement Buffer Reduction Upland Restoration 999960'60'VIEWPORT 4 - WETLAND DE Scale: 1" = 50" Wetland DE Direct Wetland Impact: 115 sf Indirect Wetland Impact: 4,712 sf Upland Restoration (in Kind): 271 sf Buffer Restoration (Trail): 5,903 sf Upland Restoration LEGEND Project Site Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts Clear and Grade Limits PROPOSED IMPACTS & MITIGATION ENLARGEMENT IMPACTS LEGEND Direct Wetland Impacts Inadequately Buffered Wetlands (Standard Setback) Buffer Reductions MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. INSET MAP SCALE: 1" = 400' VIEWPORT 1 VIEWPORT 2 VIEWPORT 3 VIEWPORT 4 VIEWPORT 5 VIEWPORTS 6 & 7 VIEWPORTS 8, 9 & 10 VIEWPORT 11 VIEWPORT 12 VIEWPORT 13 Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION ENLARGEMENTREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.9 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 VIEWPORT 5 - WETLAND AV Scale: 1" = 60" Wetland AV Indirect Wetland Impact: 586 sf Buffer Reduction: 435 sf Buffer Replacement: 441 sf Upland Restoration (in Kind): 380 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +6 sf Buffer Restoration (Trail): 1,406 sf99 99 99 99996'10'13' 16' 60' Buffer Replacement Buffer ReplacementBuffer Replacement Existing trail to be used as access road (to be resurfaced) Buffer Reduction Wetland buffer impacts were previously calculated for Wetland DK. Upland Restoration VIEWPORT 6 - WETLAND BR Scale: 1" = 60" Wetland BR Buffer Reduction: 284 sf Buffer Replacement: 297 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +13 sf Buffer Restoration (Trail): 438 sf99,,,,,,90'Buffer Replacement Buffer Reduction VIEWPORT 7 - WETLAND AG Scale: 1" = 60" Wetland AG Direct Wetland Impacts: 2,061 sf Indirect Wetland Impacts: 922 sf Buffer Reduction: 982 sf Buffer Replacement: 986 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +4 sf Buffer Restoration (Trail): 1,034 sf9999,,,,,,,60'60'Buffer Replacement Buffer Reduction Buffer Reduction Wetland buffer impacts were previously calculated for Wetland BR.9999 ,,,,,,,,,,,,,,,,54'100' VIEWPORT 9 - STREAM AC Scale: 1" = 70" Stream AC Buffer Reduction: 6,463 sf Buffer Enhancement (Culvert Removal): 6,610 sf Culvert Removal Downstream: see Viewport 10 below Ratio (Enhancement:Reduction): 1.0:1.0 No net gain of stream buffer area, but increased biodiversity and functionality. Buffer Enhancement (Stormwater Outfall): 9,167 sf Buffer Restoration (Trail): 1,493 sf Buffer Enhancement (Culvert Removal) Buffer Reduction Buffer Enhancement (Stormwater Outfall),,,,,,99 412.5 ft 415 ft 415.5 ft 413.5 ft414 ft 41 4 f t 413 ft413.5 ft416 ft414.5 ft414.5 ft414 ft4 1 3 f t416.5 ft412 ft 413.5 ft 411.5 ft 415.5 ft 410 ft410.5 ft414 ft 411 ft 413 ft411.5 f t 412 ft412.5 ft414 ft412.5 ft413 ft413 ft 413 ft 41 3 . 5 f t 412.5 ft VIEWPORT 10 - STREAM AC CULVERT REMOVAL Scale: 1" = 20" Stream AC Culvert Removal Culvert to be Removed: 26' Stream Channel Restoration: 98 sf Cross Section (Right) A A1 STREAM AC CROSS SECTION - CULVERT REMOVAL LEGEND Project Site Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts Clear and Grade Limits PROPOSED IMPACTS & MITIGATION ENLARGEMENT IMPACTS LEGEND Direct Wetland Impacts Inadequately Buffered Wetlands (Standard Setback) Buffer Reductions MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration INSET MAP SCALE: 1" = 400' VIEWPORT 1 VIEWPORT 2 VIEWPORT 3 VIEWPORT 4 VIEWPORT 5 VIEWPORTS 6 & 7 VIEWPORTS 8, 9 & 10 VIEWPORT 11 VIEWPORT 12 VIEWPORT 13 NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. VIEWPORT 8 - WETLAND AE, AF, and AH Scale: 1" = 60" Wetland AE Direct Wetland Impacts: 231 sf Indirect Wetland Impacts: 8 sf Wetland AF Indirect Wetland Impacts: 473 sf Wetland AH Direct Wetland Impacts: 95 sf Indirect Wetland Impacts: 616 sf,,,,,,, Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION ENLARGEMENTREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.10 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 VIEWPORT 11 - WETLAND CB Scale: 1" = 80" Wetland CB Buffer Reduction: 4,280 sf Buffer Replacement: 4,303 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +23 sf 99 99 992' 31 '105'Buffer Replacement Buffer Reduction Wetland CB continues to the east VIEWPORT 12 - WETLAND BL Scale: 1" = 40" Wetland BL Buffer Reduction: 960 sf Buffer Replacement: 986 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +26 sf 99 9999 65'80'150 ' Buffer Replacement Buffer Reduction Wetland BD-North standard buffer does not cross proposed ROW improvements 99 9914'80' VIEWPORT 13 - WETLAND CN Scale: 1" = 50" Wetland CN Buffer Reduction: 4,170 sf Buffer Replacement: 4,178 sf Ratio: 1.0:1.0 Wetland Buffer Net Gain: +8 sf Buffer Replacement Buffer Reduction LEGEND Project Site Shoreline Management Zone (200') Wetlands (Post Construction) Post Construction Critical Areas Buffer ,,,Stream Centerline Stream OHWM Standard Stream Buffer Managed Forest Buffer Culverts PROPOSED IMPACTS & MITIGATION ENLARGEMENT IMPACTS LEGEND Direct Wetland Impacts Buffer Reductions Inadequately Buffered Wetlands (Standard Setback) MITIGATION LEGEND Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. INSET MAP SCALE: 1" = 400' VIEWPORT 1 VIEWPORT 2 VIEWPORT 3 VIEWPORT 4 VIEWPORT 5 VIEWPORTS 6 & 7 VIEWPORTS 8, 9 & 10 VIEWPORT 11 VIEWPORT 12 VIEWPORT 13 Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION SUMMARY TABLEREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.11 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 PROPOSED IMPACTS & MITIGATION SUMMARY TABLE NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. Direct Impact (square feet) Indirect Impact (square feet) Minimum Buffer Width (feet) Buffer Reduction (square feet) Buffer Replacement (square feet) Buffer Re- Establishment (square feet) Buffer Enhancement (square feet) Upland Restoration (square feet) Ratio (Replacement:Reduction ) Buffer Net Gain (square feet) Buffer Restoration (Trail) (square feet)² Stream Channel Restoration (square feet) 1 AE 60 45 Fill 231 8 2 AF 60 45 Indirect Impact 473 3 AG 60 45 Partial Fill 2,061 922 0¹982 986 1.0:1.0 4 1,034 4 AH 60 45 Partial Fill 95 616 5 AV 60 45 Indirect Impact 586 6 435 441 4,754 380 1.0:1.0 6 1,406 6 BL 80 60 No Impact 65 960 986 1.0:1.0 26 7 BR 105 78.75 No Impact 90 284 297 1.0:1.0 13 438 8 BS (N)60 NA Fill 2,683 9 CB 105 78.75 No Impact 2 4,280 4,303 1.0:1.0 23 10 CN 80 60 No Impact 14 4,170 4,178 1.0:1.0 8 11 DE 60 45 Partial Fill 115 4,712 0¹271 5,903 12 DF 60 45 No Impact 60 13 DG 60 45 No Impact 60 14 DH 60 45 No Impact 60 15 DI 60 45 No Impact 47 16 DK 60 45 No Impact 47 294 304 154 1.0:1.0 10 2,587 17 EI 40 NA Fill 175 18 EJ 60 NA Fill 231 19 EK 60 NA Fill 179 20 EL 60 NA Fill 372 21 EM 60 NA Fill 306 22 FB 60 45 No Impact 31 783 795 1.0:1.0 12 23 FD 40 NA Fill 686 FE 105 NA Fill 324 FF 40 NA Fill 978 25 GB (N)60 45 Indirect Impact 50 2,260 2,277 1.0:1.0 17 1,945 Culvert Removal 6,463 6,610 1.0:1.0 None; only enhancement provided 1,493 98 Stormwater Outfall 9,167 8,436 7,317 20,911 14,567 4,754 15,777 805 119 NA³98TOTAL 1 - Area within minimum critical area buffer has been mitigated through the ILF program 2 - Buffer restoration from trail restoration has not been used to mitigate for wetland buffer impacts. 3 - Sum not appropriate; some buffer restoration takes place within multiple wetland buffers Post-Development Wetland Impacts Post-Development Critical Areas and Buffers 26 STREAM AC 100 75 54 #Impact StatusCritical Area Standard Buffer (feet) FWRC 19.145 25% Reduced Buffer (feet) FWRC 19.145 24 Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPROPOSED IMPACTS & MITIGATION SUMMARY TABLEREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W1.11 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 PROPOSED IMPACTS & MITIGATION SUMMARY TABLE NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. Direct Impact (square feet) Indirect Impact (square feet) Minimum Buffer Width (feet) Buffer Reduction (square feet) Buffer Replacement (square feet) Buffer Enhancement (square feet) Upland Restoration (square feet) Ratio (Replacement:Reduction) Buffer Net Gain (square feet) Buffer Restoration (Trail) (square feet)² Stream Channel Restoration (square feet) 1 AE 60 45 Fill 231 8 2 AF 60 45 Indirect Impact 473 3 AG 60 45 Partial Fill 2,061 922 0¹982 986 1.0:1.0 4 1,034 4 AH 60 45 Partial Fill 95 616 5 AV 60 45 Indirect Impact 586 6 435 441 380 1.0:1.0 6 1,406 6 BL 80 60 No Impact 65 960 986 1.0:1.0 26 7 BR 105 78.75 No Impact 90 284 297 1.0:1.0 13 438 8 BS (N)60 NA Fill 2,683 9 CB 105 78.75 No Impact 2 4,280 4,303 1.0:1.0 23 10 CN 80 60 No Impact 14 4,170 4,178 1.0:1.0 8 11 DE 60 45 Partial Fill 115 4,712 0¹271 5,903 12 DF 60 45 No Impact 60 13 DG 60 45 No Impact 60 14 DH 60 45 No Impact 60 15 DI 60 45 No Impact 47 16 DK 60 45 No Impact 47 294 304 154 1.0:1.0 10 2,587 17 EI 40 NA Fill 175 18 EJ 60 NA Fill 231 19 EK 60 NA Fill 179 20 EL 60 NA Fill 372 21 EM 60 NA Fill 306 22 FB 60 45 No Impact 31 783 795 1.0:1.0 12 23 FD 40 NA Fill 686 FE 105 NA Fill 324 FF 40 NA Fill 978 25 GB (N)60 45 Indirect Impact 50 2,260 2,277 1.0:1.0 17 1,945 Culvert Removal 6463*6,610 1.0:1.0 None; only enhancement provided 1,493 98 Stormwater Outfall 9,167 8,436 7,317 14,448 14,567 15,777 805 119 NA ³98 25% Reduced Buffer (feet) FWRC 19.145 Impact Status Post-Development Wetland Impacts * - Stream buffer reduction excluded from total TOTAL 1 - Area within minimum critical area buffer has been mitigated through the ILF program 2 - Buffer restoration from trail restoration has not been used to mitigate for wetland buffer impacts. 3 - Sum not appropriate; some buffer restoration takes place within multiple wetland buffers Post-Development Critical Areas and Buffers 24 26 STREAM AC 100 75 54 #Critical Area Standard Buffer (feet) FWRC 19.145 Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonFENCING PLAN & DETAILSREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W2.0 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/20230200400600100 Feet LEGEND Project Site Wetlands (Post Construction) Inadequately Buffered Wetlands (Standard Setback) Direct Wetland Impacts Critical Area Sign (See Detail) 2-Rail Fence (See Detail) FENCING PLAN NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonGRADING SPECIFICATIONSREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W2.1 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 GRADING SPECIFICATIONS NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. 1. GENERAL 1.1. Sequencing 1.1.1. General Construction 1.1.1.1. Contractor shall give the project biologist or ecologist a minimum of ten (10) days notice prior to beginning of construction. 1.1.1.2. No construction work shall commence until there is a meeting between the client, the project biologist or ecologist, general, clearing, and/or earthwork contractors, and the landscape contractor. The approved plans and specifications shall be reviewed to ensure that all parties involved understand the intent and the specific details related to the construction documents, specifications, and site constraints. 1.1.1.3. Locations of existing utilities have been established by field survey or obtained from available records and should be considered approximate only and not necessarily complete. It is the sole responsibility of the contractor to: (1) independently verify the accuracy of utility locations and (2) discover and avoid any utilities within the mitigation plan area(s) that are not shown, but which may be affected by implementation of the plan. Such area(s) are to be clearly marked in the field. The project biologist or ecologist shall review any conflicts with the approved grading plan prior to start of construction. 1.1.1.4. A copy of the approved plans must be on-site whenever construction is in progress, and shall remain on-site until project completion. 1.1.1.5. Construction must be performed in accordance with all agency standards, rules, codes, permit conditions, and/or other applicable ordinances and policies. 1.1.1.6. Work below the ordinary high water line shall occur within the authorized window of the Hydraulic Project Approval (HPA) and other permits. 1.1.1.7. The project owner/applicant is responsible for obtaining any other related or required permits prior to the start of construction. 1.1.1.8. A qualified wetland consultant shall be on-site, as necessary, to monitor construction and approve minor revisions to the plan, to be included in as-built drawings. 1.1.1.9. Topographic elevations represented on mitigation plans are based upon topographic maps supplied by the surveyor. Final elevations may vary depending on site-specific conditions. It is the responsibility of the contractor to verify pre-construction topographic elevations for accuracy prior to grading. Contractor shall notify the project biologist or ecologist immediately if any modifications to the plans may be necessary due to inaccuracies of the original survey. 1.1.1.10. During construction, the contractor must use materials and construction methods that prevent toxic substances and other pollutants from entering mitigation areas or other natural waters of the state. 1.1.1.11. Preventative measures shall be used to protect existing storm drainage systems, existing utilities, and roads. 1.1.1.12. The contractor shall provide sediment and erosion controls around the project area prior to soil disturbance from construction activity. 1.1.2. Mitigation Construction: The following provides the general sequence of activities anticipated to be necessary to complete this mitigation project. Some of these activities may be conducted concurrently as the project progresses. 1.1.2.1. Conduct a site meeting between the contractor, the project biologist or ecologist, and the owner’s representative to review the project plans, work areas, staging/stockpile areas, material disposal areas, and existing vegetation to be retained. 1.1.2.2. Survey clearing/grading limits. 1.1.2.3. Project biologist and/or ecologist shall review clearing limits and shall flag trees and other existing vegetation to remain within the work area. The project biologist or ecologist shall also flag any woody material to be saved and stockpiled for later use as habitat features (stumps, down logs). 1.1.2.4. Install silt fence and any other erosion and sedimentation control BMPs necessary for work in the project areas. 1.1.2.5. Working within the approved HPA in-water work window, install temporary stream bypass and sandbag dams. 1.1.2.5.1. Culvert removal will only be done in the summer months. 1.1.2.5.2. Install fish exclusion devices in Stream AC at either end of the in-stream work area, if needed, pending presence of water (which may run dry in the summer months). 1.1.2.5.3. Install dam at upstream end of culvert work area. 1.1.2.5.4. Install dam at downstream end of culvert work area. 1.1.2.5.5. Divert stream flows around the culvert work area. 1.1.2.5.6. Use seine nets to capture and remove fish from the Project Area, if water is present. 1.1.2.5.7. Dewater culvert work area. 1.1.2.5.8. Remove culvert. 1.1.2.5.9. Regrade new stream channel to match up and downstream elevations and cross section/profile. 1.1.2.5.10. Install coir fabric in new stream channel to cover disturbed soils. 1.1.2.5.11. Place stream aggregate in new channel per WDFW guidance and specifications. 1.1.2.5.12. Plant per the planting typicals/plans. 1.1.2.5.13. Slowly reintroduce water into the new stream channel until water level within the new channel is roughly equal to the water levels immediately downstream of the Project Area. If no water in stream, then skip to next step. 1.1.2.5.14. Remove the lower dam. 1.1.2.5.15. Remove the upper dam. 1.1.2.5.16. Remove the stream diversion system. 1.1.2.5.17. Remove fish exclusion devices. 1.1.2.6. Install tree protection fencing around existing trees and vegetation to remain (see civil plans). 1.1.2.7. Clear and grub grading areas. 1.1.2.8. Grub out all invasive species from buffer enhancement areas shown in plans. 1.1.2.9. Survey earthwork areas and set grade stakes as required. 1.1.2.10. Complete excavation of mitigation areas to subgrade per grading plan. 1.1.2.11. Install streambed aggregate. 1.1.2.12. Decompact subgrade as necessary and place topsoil. 1.1.2.13. Place woody debris (long & short down logs, rootwads, stumps). 1.1.2.14. Mulch all cleared/graded buffer areas. 1.1.2.15. Complete site cleanup and install plant material as indicated on the mitigation plan. 1.1.2.16. Install temporary irrigation. 1.1.2.17. Install critical area fence & signs. 1.2. Project Conditions 1.2.1. Protection and Maintenance of Off-Site Areas: Contractor shall ensure that construction related activities do not damage off-site features or adjacent vegetation. The project biologist or ecologist shall be notified immediately if accidental damage occurs. Contractor shall ensure that adjacent roads are maintained and kept clear of soil and/or other debris at all times during construction. Contractor shall comply with the governing jurisdiction’s codes regarding street maintenance/cleaning during construction. 1.2.2. Plan Changes and Modifications: Any changes or modifications to the mitigation plans or specifications must receive prior approval from the owner’s representative, the project biologist or ecologist, and applicable agencies. 1.3. Warranty 1.3.1. Warranty Terms and Conditions: A contractor-provided warranty shall extend for a period of one year from the date of physical completion. Physical completion for the work of this section is the date when all grading, planting, irrigation, and related phases of such work have been completed and are accepted by the owner’s representative, the project biologist or ecologist, and applicable agencies. Contractor’s warranty shall include grading corrections. 2. PRODUCTS AND MATERIALS 2.1. Habitat Features 2.1.1. Down Logs: Down logs shall be cedar or fir species, have a 12 foot minimum length, with or without roots, and a minimum diameter of 15 inches. Bark shall be kept intact. Ends that have been cut shall be distressed and not blunt. 2.2. In-Stream Structures 2.2.1. Fix Mix/Streambed Aggregate: Fix mix shall be streambed “streambed sediment” per WSS 903.11 (1). Project biologist or ecologist shall approve rock mix placement. Aggregates available from the following suppliers: Cadman (425) 867 – 1234 or Washington Rock Quarries, Inc. (253) 252 - 5612 2.3. Temporary Bypass and Sandbag Dam 2.3.1. Temporary Bypass: The temporary bypass shall be a flexible pipe composed of PVC or ADS N 12. The pipe shall be of sufficient size to pass all flows and debris, this shall be determined by the contractor. Temporary bypass shall be in place until all work in the mitigation areas, including irrigation, planting, and mulching are complete. 2.4. Topsoil 2.4.1. Topsoil: topsoil that has been stockpiled on-site for reuse in project area(s) or imported from off-site sources shall be fertile, friable, sandy loam surface soil, free of subsoil, clay lumps, brush, weeds, roots, stumps, stones larger than one (1) inch in any dimension, litter, or any other extraneous or toxic matter harmful to plant growth. 2.4.2. Organic Content: Imported topsoil shall consist of organic materials amended as necessary to produce a bulk organic content of at least 10 percent and not greater than 20 percent, as determined by AASHTO-T-194. 2.5. Mulch 2.5.1. Bark or woodchip mulch shall be derived from Douglas fir, pine, or hemlock species. The mulch shall not contain resin, tannin, or other compounds in quantities that would be detrimental to animal, plant life, or water quality. Sawdust shall not be used as mulch. 2.5.2. Mulch size shall be medium-coarse ground with an approximately 3-inch minus particle size. Fine particles shall be minimized so that not more than 30% by loose volume, will pass through a US No. 4 sieve. 3. EXECUTION 3.1. Survey/Stake/Flag Limits of Clearing 3.1.1. Prior to any construction, a licensed surveyor shall survey, stake, and flag clearing limits. Clearing limits are depicted on the mitigation plans. The project biologist or ecologist shall review and approve flagging of clearing limits prior to any vegetation removal. It is the responsibility of the contractor to verify actual locations of vegetation to be saved and request that the project biologist or ecologist modify the grading plan as necessary to avoid all significant native vegetation. 3.2. Flag and Protect Existing Vegetation to Remain 3.2.1. Contractor shall be responsible for avoiding disturbance to existing vegetation located outside the clearing limits. No removal of any vegetation shall occur without prior approval by the project biologist or ecologist. 3.2.2. The project biologist or ecologist shall flag existing vegetation to remain located within the project area(s). Prior to grading, contractor shall install orange barrier fencing two (2) feet beyond the dripline of flagged existing vegetation. Flagged vegetation shall not be disturbed, unless approved in writing by the project biologist or ecologist. Fencing shall remain in place until the completion of earthwork. 3.2.3. Contractor shall exercise care to prevent injury to the trunk, roots, and branches of trees and shrubs to remain. Any woody plant to remain that is damaged during construction shall be treated immediately after damage occurs, and the project biologist or ecologist shall be notified of incident. Damage treatment shall include evenly cutting broken branches, broken roots, and damaged tree bark. Injured plants shall be thoroughly watered and additional measures shall be taken, as appropriate, to aid in plant survival. 3.3. Flag Vegetation & Woody Material for Future Use as Habitat Features 3.3.1. The project biologist or ecologist shall flag existing vegetation and woody material (rootwads, stumps, down logs, and boulders), if available, to be relocated b the contractor from within the development footprint for used as habitat features in the mitigation area(s). Whenever possible, habitat features shall be moved directly to permanent locations. If necessary, habitat features shall be placed in stockpile areas as near to permanent locations as possible. The project biologist or ecologist shall designate stockpile areas. 3.3.2. Contractor shall exercise care when moving habitat features to avoid breaking branches, scuffing bark, or breaking roots. It is the responsibility of the contractor to break pieces into usable sizes. 3.3.3. If habitat features are not available from any portion of the development footprint, then features shall be provided by the contractor. 3.4. Place Erosion Control Measures: 3.4.1. Contractor shall install silt fencing downslope of the clearing limits depicted on the mitigation grading plans prior to any construction activity. Contractor shall maintain erosion control facilities until completion of construction. The project biologist or ecologist shall verify and approve locations of erosion control measures prior to site grading. 3.4.2. Site areas exposed during grading and construction must be covered with straw (maximum depth 3 inches), erosion control netting, plastic sheeting, or permanent erosion control within 48 hours of disturbance, or as required for National Pollutant Discharge Elimination System (NPDES) or local jurisdiction compliance. 3.4.3. Contractor shall maintain erosion control measures for the duration of the project. These measures shall remain in place until authorization is given by the project biologist or ecologist for removal or location adjustment. It is the responsibility of the contractor to remove all erosion control measures adjacent to sensitive areas when authorized by the project biologist or ecologist. 3.4.4. As construction progresses and seasonal conditions dictate, erosion control facilities shall be maintained and/or altered as required be the project biologist or ecologist to ensure continued erosion/sedimentation control. 3.4.5. Where possible, natural ground cover vegetation shall be maintained for silt control. 3.5. Install Temporary Bypass and Sandbag Dam: Shall be performed only during the HPA window (contractor shall verify with permitting agency) 3.5.1. Prior to any earthwork activity for the new stream channel, a temporary stream bypass shall be constructed to connect between the sandbag dam locations shown on the plan. Contractor may construct the bypass anywhere between the two locations where the bypass will be minimally disturbed. Project biologist or ecologist shall verify points of bypass locations prior to installation. For all areas, contractor shall take care to maximize erosion control measures to prevent sediment from entering the stream channel. 3.6. Clear and Grub Site 3.6.1. Contractor shall clear and grub areas within the clearing limits shown on the mitigation plans, with the exception of flagged existing vegetation to remain. In areas of existing vegetation, contractor shall remove blackberry and other invasive species by hand, with minimal disturbance to the existing vegetation. All roots shall be removed to the maximum extent practicable. Cleared and grubbed vegetation shall be exported from the site. Invasive/exotic plant species to be removed and treated in the mitigation area(s) include, but are not limited to: Scot’s broom, English ivy, Himalayan and evergreen blackberry, reed canarygrass, purple loosestrife, hedge bindweed (morning glory), Japanese knotweed, thistle, and creeping nightshade. For reed canarygrass, roots shall be removed down to a minimum depth of 12 inches. 3.6.2. The project biologist or ecologist shall designate any additional plan species to be removed prior to construction. 3.7. Survey/Stake/Flag Proposed Grades: A licensed surveyor shall survey, stake, and flag proposed grades within the mitigation area(s). Grades shall be staked and flagged at 25’ intervals and at all high and low points. The project biologist or ecologist shall approve grade staking prior to excavation and shall monitor during construction. 3.8. Stockpile Topsoil 3.8.1. Contractor shall salvage and stockpile topsoil at appropriate locations adjacent to mitigation areas. 3.8.2. If topsoil contains debris, or is determined unsuitable by the project biologist or ecologist, contractor shall dispose of material off-site and import suitable material. 3.9. Excavate Mitigation Areas 3.9.1. Contractor shall excavate graded areas per grading plan without removing grade stakes. The project biologist or ecologist to make minor field adjustments to grading plan, as necessary, to ensure proper function of the mitigation area(s). 3.9.2. In the mitigation area(s), over-excavate nine (9) inches below finished grades shown on plans to allow for placement of nine (9) inches of stockpiled or imported topsoil. Excavated soils shall be used on-site, if possible, otherwise they shall be exported off-site. 3.9.3. Fill soils proposed for use within the mitigation area(s) shall be submitted to the geotechnical engineer for analysis and approval prior to use, and shall meet all applicable specifications for fill soils per the project geotechnical engineer. In areas of fill placement, contractor shall compact soil in lifts according to geotechnical engineer specifications. Geotechnical engineer shall approve all areas of fill placement to ensure adequacy of compaction. Contractor shall be notified by the general contractor as to who the geotechnical engineer will be. 3.9.4. Upon completion of excavation, the project biologist or ecologist shall review and approve subgrade in relation to original grade stakes. If grade stakes are removed prior to approve by the project biologist or ecologist, as as-built survey will be required. The as-built survey, by a licensed surveyor, will include one-foot contour intervals with spot elevations of high and low points, and pond surface elevations. 3.9.5. After subgrade approval, the contractor shall remove grade stakes and proceed with topsoil and habitat feature placement. 3.10. Place Fish Mix in Primary Channel: 3.10.1. Contractor shall place rock mix in channel including within box culvert, per stream profiles on mitigation plans. Project biologist or ecologist shall approve rock mix placement. 3.11. Place Topsoil: See Planting Specifications 3.11.1. In all graded project areas, nine (9) inches of stockpiled or imported topsoil shall be placed over subgrade. NOTE: Prior to placing topsoil, subgrade shall be decompacted or scarified to a minimum depth of six (6) inches if subsoil is excessively compacted and unsuitable for plant growth. 3.12. Place Habitat Features: Place habitat features upon completion of topsoil placement, as depicted on the mitigation plans and details. The project biologist or ecologist shall approve locations prior to placement. 3.12.1. Down logs: To cut/break down logs, first score the log at the desired length by mechanical means, then snap the log at the scored location to create a natural look to the break. Twist broken ends to disguise saw cuts. Habitat features that have been cut shall have no blunt ends. 3.13. Mulch Graded Buffers: The project biologist or ecologist shall be provided a mulch sample prior to delivery to site. No buffer areas shall be seeded unless specified in the mitigation plan. 3.13.1. Contactor shall spread mulch over all graded buffer areas to achieve a uniform depth of three (3) inches. NOTE: 3-inch depth is the minimum after settling. If mulch is installed by blower truck it shall be installed at a 4-inch depth to ensure a minimum 3-inch depth after settling. 3.14. Grading Inspections: Prior to plant installation the project biologist or ecologist shall approve all grading work, and all structure and habitat feature placement. If items are to be corrected, a punch list shall be prepared by the project biologist or ecologist and submitted to the contractor for completion. After punch list items have been completed, the project biologist or ecologist shall review the project for final internal acceptance of grading plan implementation, and planting may then proceed. 3.15. Soils Stabilization: If there is a delay in construction for any reason, contractor shall be responsible for maintenance of erosion control measures, drainage, and temporary irrigation during construction delay period, unless otherwise stated in writing. 3.16. Washington State Department of Fish and Wildlife (WDFW) Approval of New Stream Corridor: 3.16.1. The area habitat biologist shall be contacted within seven (7) days of the completion of the new channel to arrange for compliance inspection. Upon review and approval, project biologist or ecologist will notify the (City) of said approval from WDFW. 3.16.2. Stream diversion shall be removed only after inspection and approval of new channel by the area habitat biologist per the HPA requirements. Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPLANT SCHEDULE & DETAILSREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W3.0 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 LEGEND Project Site Post Construction Critical Areas Buffer Wetlands (Post Construction) Inadequately Buffered Wetlands (Standard Setback) Direct Wetland Impacts Stream OHWM ,,,Stream Centerline Buffer Replacements Buffer Restoration Upland Restoration Stream Buffer Enhancement Stream Channel Restoration FENCING PLAN INSET MAP SCALE: 1" = 400',,,,,VIEWPORT 1 VIEWPORT 2 VIEWPORT 1 - PLANTING AREA (NORTH) Scale: 1" = 100" Trail #1 (7,260 sf) Trail #2 (1,249 sf) Upland #1 (271 sf) Upland #2 (154 sf) Upland #3 (128 Upland #4 (252 sf)Trail #3 (157 sf),,,,,,,,,,,VIEWPORT 2 - PLANTING AREA (SOUTH) Scale: 1" = 100" Trail #4 (600 sf) Trail #5 (893 sf) Enhancement #1 (6,610 sf) Enhancement #2 (9,167 sf) PLANT SCHEDULE NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. Trail #1 Trail #2 Trail #3 Trail #4 Trail #5 Acer macrophyllum Bigleaf maple FACU 15 6 1 2 2 10'OC 2 - 3'2 gal, full & bushy Pseudotsuga menziesii Douglas fir FACU 30 6 1 2 4 10'OC 2 - 3'2 gal, full & bushy Tsuga heterophylla Western hemlock FACU 30 2 4 10'OC 2 - 3'2 gal, full & bushy Corylus cornuta Beaked hazelnut FACU 18 3 2 2 9'OC 1 gal Full & bushy Holodiscus discolor Oceanspray FACU 18 3 1 2 2 9'OC 1 gal Full & bushy Sambucus racemosa Red elderberry FACU 8 1 1 1 9'OC 1 gal Full & bushy Symphoricarpos albus Common snowberry FACU 62 10 1 6 5 6'OC 1 gal Multi-cane (3 min) Rubus parviflorus Thimbleberry FACU 40 7 1 3 3 6'OC 1 gal Multi-cane (3 min) 221 36 5 20 23 NOTES TREES SMALL TREES/LARGE SHRUBS SHRUBS TOTAL SCIENTIFIC NAME COMMON NAME WIS QUANTITY SPACING SIZE (MIN) Upland #1 Upland #2 Upland #3 Upland #4 Enhancement #1 Enhancement #2 Acer macrophyllum Bigleaf maple FACU 1 1 15 10'OC 2 - 3'2 gal, full & bushy Pseudotsuga menziesii Douglas fir FACU 1 1 1 1 25 46 10'OC 2 - 3'2 gal, full & bushy Tsuga heterophylla Western hemlock FACU 1 1 1 30 46 10'OC 2 - 3'2 gal, full & bushy Corylus cornuta Beaked hazelnut FACU 1 1 1 1 16 22 9'OC 1 gal Full & bushy Holodiscus discolor Oceanspray FACU 1 1 16 22 9'OC 1 gal Full & bushy Sambucus racemosa Red elderberry FACU 8 11 9'OC 1 gal Full & bushy Symphoricarpos albus Common snowberry FACU 2 1 1 2 55 80 6'OC 1 gal Multi-cane (3 min) Rubus parviflorus Thimbleberry FACU 2 1 1 2 40 50 6'OC 1 gal Multi-cane (3 min) 9 5 4 9 205 277TOTAL SCIENTIFIC NAME COMMON NAME WIS SIZE (MIN) SHRUBS NOTESSPACINGQUANTITY TREES SMALL TREES/LARGE SHRUBS MITIGATION SEQUENCING OVERVIEW 1. Install erosion and sediment control BMPs. Stream AC culvert removal will require work area isolation actions if any water is present within the stream channel. 2. Clear and grub as required by Mitigation plan, remove gravel substrate from trail area and any invasive species present; 3. Decompact soils, scarify and amend with topsoil or compost; 4. Add soil amendments, as determined necessary; 5. Install large wood as noted on Mitigation Plan; 6. Installing 3 inches of bark mulch in all bare soil areas; and 7. Planting a variety of native deciduous and evergreen tree and shrub species. Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPLANT SPECIFICATIONSREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W3.1 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 PLANT SPECIFICATIONS NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019. 1. GENERAL 1.1. Sequencing 1.1.1. General Construction 1.1.1.1. Contractor shall give the project biologist or ecologist a minimum of ten (10) days notice prior to beginning of construction. 1.1.1.2. No construction work shall commence until there is a meeting between the client, the project biologist or ecologist, general, clearing, and/or earthwork contractors, and the landscape contractor. The approved plans and specifications shall be reviewed to ensure that all parties involved understand the intent and the specific details related to the construction documents, specifications, and site constraints. 1.1.1.3. Locations of existing utilities have been established by field survey or obtained from available records and should be considered approximate only and not necessarily complete. It is the sole responsibility of the contractor to: (1) independently verify the accuracy of utility locations and (2) discover and avoid any utilities within the mitigation plan area(s) that are not shown, but which may be affected by implementation of the plan. Such area(s) are to be clearly marked in the field. The project biologist or ecologist shall review any conflicts with the approved grading plan prior to start of construction. 1.1.1.4. A copy of the approved plans must be on-site whenever construction is in progress, and shall remain on-site until project completion. 1.1.1.5. Construction must be performed in accordance with all agency standards, rules, codes, permit conditions, and/or other applicable ordinances and policies. 1.1.1.6. The project owner/applicant is responsible for obtaining any other related or required permits prior to the start of construction. 1.1.1.7. A qualified wetland consultant shall be on-site, as necessary, to monitor construction and approve minor revisions to the plan, to be included in as-built drawings. 1.1.1.8. During construction, the contractor must use materials and construction methods that prevent toxic substances and other pollutants from entering mitigation areas or other natural waters of the state. 1.1.1.9. Preventative measures shall be used to protect existing storm drainage systems, existing utilities, and roads. 1.1.1.10. The contractor shall provide sediment and erosion controls around the project area prior to soil disturbance from construction activity. 1.1.2. Mitigation Construction: The following provides the general sequence of activities anticipated to be necessary to complete this mitigation project. Some of these activities may be conducted concurrently as the project progresses. 1.1.2.1. Conduct a site meeting between the contractor, the project biologist or ecologist, and the owner’s representative to review the project plans, work areas, staging/stockpile areas, material disposal areas, and existing vegetation to be retained. 1.1.2.2. Plant trees and shrubs as indicated on mitigation plans. 1.1.2.3. Mulch plants installed in non-graded buffer areas. 1.1.2.4. Install temporary irrigation system and program for 0.5-inches of water every 3 days. 1.1.2.5. Install fencing and critical area protection signs. 1.2. Submittals 1.2.1. Product Data: Furnish the following with each plant material delivery: 1.2.1.1. Invoices indicating sizes and variety of plant material. 1.2.1.2. Certificates of inspection required by state and federal agencies. 1.2.2. Quality Control Submittals. Prior to delivery of materials, certificates of compliance attesting that materials meet the specified requirements shall be furnished for the following: plants, topsoil, fertilizer, and organic mulch. Certified copes of the material certificates shall include the following: 1.2.2.1. Plant materials: botanical name, common name, size, quantity by species, and location where grown. 1.2.2.2. Imported topsoil: particle size, pH, organic matter content, textural class, soluble salts, chemical and mechanical analyses. 1.2.2.3. Fertilizer: chemical analysis and percent composition. 1.2.2.4. Imported mulch: composition and source. 1.3. References 1.3.1. Size and Grading Standards: Shall conform to the current edition of the American Standard for Nursery Stock, published by the American Nursery and Landscape Association. 1.4. Quality Assurance 1.4.1. Worker’s Qualifications: The persons performing the planting and their supervisor(s) shall be personally experiences with planting and caring for plant material, and shall have been regularly employed by a company engaged in planting and caring for plant material for a minimum of 2 years. 1.4.2. Plant Material: All plant materials shall be locally grown for regionally acclimatized to the Pacific Northwest. 1.5. Delivery, Inspection, Storage and Handling 1.5.1. Delivery: A delivery schedule shall be provided at least 10 calendar days prior to the first day of delivery. Plant materials shall be delivered to the job site not more than 7 working days prior to their respective planting dates. 1.5.2. Protection during Delivery: Plant material shall be protected during delivery to prevent desiccation and damage to the branches, trunk, root system, or earth ball. Branches shall be protected by tying-in. Exposed branches shall be covered during transport. 1.5.3. Fertilizer: Fertilizer shall be delivered in manufacturer’s standard sized bags showing weight, analysis, and manufacturer’s name. Store under a waterproof cover or in a dry place as designed by the owner’s representative. 1.5.4. Inspection: All plant materials shall be inspected upon arrival at the job site by the owner’s representative for conformity to type and quantity with regard to their respective specifications. 1.5.5. Mulch: A mulch sample shall be inspected by the project biologist or ecologist prior to the mulch being delivered to the site. 1.5.6. Storage: 1.5.6.1. Plant material not installed on the day of arrival at the site shall be stored and protected in designated areas. Plants stored on the project site shall be protected from extreme weather conditions by insulating the roots, root balls or contains with sawdust, soil, compost, bark or woodchips. Plant material shall be protected from direct exposure to wind and sun. Bare-root plant material shall be heeled-in. Cuttings and emergent plants must be protected from drying at all times and shall be heeled-in with moist soil or other insulating material. All plant material stored on-site shall be watered daily until installed. 1.5.6.2. Storage of other materials shall be in designated areas. 1.6. Scheduling 1.6.1. Planting Season: Install woody plants between October 1 and February 15 whenever the temperature is above 32 degrees F and the soil is in a workable condition, unless otherwise approved in writing. Cuttings shall only be used if planting occurs between December 1st and April 1st. 1.6.2. Plant Installation: Except for container-grown plant material, the maximum time between the digging and installation of plant material shall be 21 days. The maximum time between plant installation and mulch placement shall be 72 hours. 1.7. Warranty 1.7.1. Warranty Period: A contractor-provided warranty shall extend for a period of one year from the date of physical completion. Physical completion for the work of this section is the date when all grading, planting, irrigation, and related phases of such work have been completed and are accepted by the owner’s representative, the project biologist or ecologist, and applicable agencies. 1.7.2. Warranty Terms: Contactor’s warranty shall include replacement of plants due to mortality (same size and species shown on the drawings). Plants replaced under this warranty shall be warranted for an additional year after replacement. 1.7.3. Exceptions: Loss due to excessively severe climatological conditions (substantiated by 10-year recorded weather charts), or cases of neglect by owner, or cases of abuse/damage by others. 2. PRODUCTS AND MATERIALS 2.1. Plants 2.1.1. General: All plant material will conform to the varieties specified or shown in the plant list(s) indicated on the mitigation plants and be true to botanical name as listed in: Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press. 2.1.2. Shrubs and Trees: 2.1.2.1. The project biologist or ecologist shall examine plant material prior to planting. Any material not meeting the required specifications shall be immediately removed from the site and replaced with like material that meets the required standards. Plant material shall meet the requirements of state and federal laws with respect to plant disease and infestations. Inspection certificates, required by law, shall accompany each and every shipment and shall be submitted to the project biologist or ecologist upon contractor’s receipt of plant material. 2.1.2.2. Plant materials shall be locally grown (western Washington, western Oregon, or western BC), healthy, bushy, in vigorous growing condition, and guaranteed to be true to size, name, and variety. If replacement of plant material is necessary due to construction damage or plant failure within one year of installation, the sizes, species, and quantities shall be equal to specified plants, as indicated on the plans. 2.1.2.3. Plants shall be nursery grown, well-rooted, or normal growth and character, and free from disease or infestation. The project biologist or ecologist reserves the right to require replacement of substitution of any plants deemed unsuitable. 2.1.2.4. Trees shall have uniform branching, single straight trunks (unless specified as multi-stem, multi-cane, or multi-trunk), and an intact and undamaged central leader. Container stock shall have been grown in a container for at least one full growing season and shall have a well developed root system. Plant material that is root-bound or has damaged root zones or broken root balls will not be accepted. 2.1.2.5. Coniferous trees shall be nursery grown, full and busy, with uniform branching and a natural non- sheared form. Original central leader must be healthy and undamaged. Maximum gap between branching shall not exceed 9 inches, and length of top leader shall not exceed 12 inches. 2.1.2.6. Shrubs shall have a minimum of three stems and shall be a minimum height of 18 inches. 2.1.2.7. Trees and shrubs shall have developed root and branch systems. Do not prune branches before delivery. 2.1.2.8. Native plant cuttings shall be grown and collected in the maritime Pacific Northwest. Cuttings shall be of one to two-year-old wood, ½ inch diameter minimum. Cuttings shall be a minimum of 4 feet in length with 4 lateral buds exposed above ground after planting. The top of each cutting shall be a minimum of 1 inch above a leaf bud, the bottom cut 2 inches below a bud. The basal ends of the cuttings shall be cut at a 45 degree angle and marked clearly so that the rooting end is planted in the soil. Cuttings must be kept covered and moist during storage and transport, and no cutting shall be stored more than three days from date of cutting. Cuttings shall only be used if planting occurs between December 1st and April 1st. For planting between April 1st and December 1st, container plants shall be used. 2.1.2.9. Plants shall be free of splits and checks, bark abrasions, and disfiguring knots. 2.1.2.10. For deciduous plants, buds shall be intact and reasonably closed at time of planting, if dormant. 2.1.2.11. Plants shall conform to sizes indicated on the plant schedule. Plants may be larger than the minimum sizes specified. 2.1.3. Noxious Species: All plant stock and other re-vegetation materials shall be free from the seed or other plant components of any noxious or invasive species, as identified by the King County Noxious Weed Control Board. 2.1.4. Substitutions: Substitutions will not be permitted without a written request and approval from the owner’s representative, the project biologist or ecologist, and applicable agencies. 2.2. Planting Soil 2.2.1. Topsoil: If suitable stockpiled native topsoil is not available for mitigation plantings, topsoil shall be obtained from outside sources. Stockpiled or imported topsoil shall be fertile, friable, sandy loam surface soil, free of subsoil, clay lumps, brush, weeds, roots, stumps, stones larger than 1 inch in any direction, litter, or anyother extraneous or toxic matter harmful to plant growth. 2.2.2. Organic Content: Imported topsoil shall consist of organic materials amended as necessary to produce a bulk organic content of at least 10 percent and not greater than 20 percent, as determined by AASHTO-T-194. 2.2.3. Compost: Compost shall meet the definition for composted materials as defined by the Washington State Department of Ecology. 2.2.4. Soil Amendments (Buffer Areas Only): 2.2.4.1. Fertilizer: Woody plantings shall be fertilized with a slow-release general granular fertilizer (16-16-16), with application rates as specified by manufacturer. Fertilizer shall be applied after planting pit is backfilled, and prior to application of mulch. Fertilizer shall not be applied between November and March. No fertilizer shall be applied within wetland areas. 2.2.4.2. Soil Moisture Retention Agent: A soil moisture retention agent, such as “SoilMoist” or equal, shall be incorporated into the backfill of each planting pit, per manufacturer’s instructions. No moisture retention agent shall be applied within wetland areas. 2.3. Mulch 2.3.1. Bark or woodchip mulch shall derived from Douglas fir, pine, or hemlock species. The mulch shall not contain resin, tannin, or other compounds in quantities that would be detrimental to animal, plant life, or water quality. Sawdust shall not be as mulch. 2.3.2. Mulch shall be medium-coarse ground with an approximately 3-inch minus particle size. Fine particles shall be minimized so that not more than 30 percent, by loose volume, will pass through a US No. 4 sieve. 2.4. Miscellaneous Materials 2.4.1. Stakes, Deadmen and Guy Stakes: Sound, durable, western red cedar, or other approved wood, free of insect or fungus infestation. 2.4.2. Chain-lock tree tires: ½-inches wide, plastic. 3. EXECUTION 3.1. Soil Preparation 3.1.1. Planting Area Conditions: Contractor shall verify that plant installation conditions are suitable within the project area(s). Any unsatisfactory conditions shall be corrected prior to start of work. When conditions detrimental to plant growth are encountered, such as rubble fill, poor drainage, compacted soils, significant existing or invasive vegetation, or other obstructions, contractor shall notify the project biologist or ecologist prior to planting. The beginning of work by the contractor constitutes acceptance of conditions as satisfactory. 3.1.2. Planting in Undisturbed, Non-Graded Areas: Plants installed in undisturbed areas shall be integrated with existing native vegetation and planted in a random, naturalistic pattern. Prior to installation of plantings, all construction debris, trash, and non-native invasive plant material shall be removed from the project area. In non-graded areas, trees and shrubs shall be pit planted as shown in typical planting details. Planting pits shall be backfilled with a 50/50 mixture of imported, weed-free topsoil and the soil from the planting pit. 3.1.3. Planting in Graded Areas: In graded planting areas, plants shall be installed in newly placed topsoil. 3.1.4. Soil Decompaction/Scarification: Soils in graded/disturbed areas that are compacted and unsuitable for proper plant growth shall be decompacted and/or scarified to a minimum depth of 6 inches prior to topsoil installation. 3.2. Planting 3.2.1. Plant Layout: Proposed locations of trees and shrubs shall be staked and identified within an approved coding system or by placement of the actual plant material. For large groupings of a single species of shrub, landscape contractor may stake the planting boundaries. 3.2.2. Obtain layout approved from the project biologist or ecologist prior to excavation of planting pits. 3.2.3. Plant Pit Dimensions: 3.2.3.1. Pit Depth: Not to exceed the root ball or container depth. 3.2.3.2. Pit Width: Measured at the ground surface, 2 times the width of the root ball or container, as indicated in typical planting details. For bare-root plants, diameter equal to the width of the root spread. 3.2.4. Setting Plants: 3.2.4.1. Shrub/Tree Planting: Shrub and tree stock shall be planted in hand-dug holes according to planting details shown on the mitigation plans. Shrub and tree root balls shall be set so that roots collars are 1 inch above adjacent grade. All backfill shall be gently tamped in place. 3.2.4.2. Surface Finish: Form a saucer as indicated on typical planting details, or as directed. Grade soil to form a basin on the lower side of slope plantings to catch and retain water. 3.2.4.3. In forested areas, contractor shall loosely tie a 2 foot piece of biodegradable flagging to the top portion of all planted vegetation, but not on a central leader, to facilitate post-construction performance and maintenance review by the project biologist or ecologist and regulatory agencies. 3.2.4.4. Actual plant symbol quantities shown on the plants shall prevail over quantities shown on the plant schedule in the event of a discrepancy. 3.2.5. Mulching: 3.2.5.1. Graded Buffer Areas: Are mulched prior to plant installation as directed in the grading specifications. 3.2.5.2. Non-Graded Buffer Areas: Provide a 36-inch diameter, 3-inch deep mulch ring around the base of each tree, and a 24-inch diameter, 3-inch deep mulch ring around the base of each shrub. 3.2.5.3. Water plants thoroughly after mulching. 3.2.6. Pruning: Prune immediately after planting only as directed by the project biologist or ecologist. 3.2.7. Tree Stakes and Ties: Stake deciduous and evergreen trees 4 feet or over in height with one (1) stake per tree. Stake trees immediately after planting. Place stake at the outer edge of the roots or ball, in line with the prevailing wind, and at a 10 degree angle from the tree trunk. Loosely attach stake to tree using chain-lock ties; tree should be able to sway. 3.2.8. Installing Temporary Irrigation 3.2.8.1. General Requirements: Contactor shall provide an above-ground temporary irrigation system capable of full head-to-head coverage of all planted project areas. The temporary irrigation system shall either utilize controller and point of connection (POC) from the site irrigation system or shall include a separate POC and controller with a backflow prevention device per water jurisdiction inspection and approval. The system shall be zoned to provide optimal pressure and uniformity of coverage, as well as separation between areas of full sun and shade and for slopes in excess of 5 percent. The system shall be operation for a minimum of the first two growing seasons after planting (the first two years of the performance monitoring period), or longer if required to ensure proper plant establishment. The system shall be removed upon final approval of the mitigation project at the end of the performance monitoring period. 3.2.8.2. System Design and Materials: Electronic valves shall be the same manufacturer as those used for the site irrigation system, or shall be Rain Bird PEB series or equal if system is not contiguous with the site system. Valves shall be sized to accommodate pressure and zone consumption requirements of the system and shall be installed below grade in Carson (or equal) valve boxes. Wiring shall be insulated multi-strand, taped to the main at 6-inch intervals with duct tape wraps. On-grade main and lateral lines shall be Class 200 PVC Bell Pipe with solvent welded fittings, secured in-place with wire staples where necessary on sloped areas. Lines shall be placed 12 inches below grade in 4 inch PVC sleeves where vehicular or maintenance access is needed across lies to the project area(s). Maximum main line size shall be 1 ½ inches and may be looped back to the POC to reduce pressure loss. Lateral lines shall be sized in decreasing downstream order per Rain Bird design standards; the minimum lateral size shall be ¾ inch. Heads shall be rotor or impact type installed 4 feet above finished grade on 2-inch diameter wood tree stakes. Stakes shall be secure in the ground, embedded to a minimum depth of 24 inches. Heads and ¾ PVC risers shall be secured to stakes with constricting hose clamps; no funny pipe shall be used. Heads and nozzles shall provide matched precipitation rates for each zone. 3.2.8.3. Programming: Irrigation system shall be programmed to provide approximately ½ inch of water every three days during the dry season (approximately June 15th to October 15th). Irrigation amounts in zones located in the shade or on steep slopes may be reduced if approved by the project biologist or ecologist. 3.2.8.4. Water and Power Supple for System: The owner shall provide water and electricity for the system. 3.2.8.5. As-Built Drawing: A chart describing the location of all installed or open zones and corresponding controller numbers shall be provided by the contractor and placed inside the controller and given to the owner’s representative. 3.2.8.6. Warranty: The irrigation system shall include a one-year warranty against defects in materials and workmanship from the date of final project acceptance. The warranty shall include system activation and winterization for the first year and immediate repair of the system if it is observed to be malfunctioning. 3.2.9. Critical Areas Fence and Signs: Install critical areas fence and critical areas signs where shown on plans. 3.2.10. Restore Existing Natural or Landscaped Areas: 3.2.10.1. Existing natural or landscapes areas that are damaged during construction shall be restored to their original condition, unless improvements or modifications are specified for those areas. 3.2.10.2. Contractor shall exercise care to prevent injury to the trunk, roots, or branches of any trees or shrubs that are to remain. Any living woody plant that is damaged during construction shall be treated within 24 hours of occurrence, and the project biologist or ecologist shall be notified immediately of the incident. Damage treatment shall include evenly cutting broken branches, broken roots, and damaged tree bark. Injured plants shall be thoroughly watered and additional measures shall be taken, as appropriate, to aid in plant survival. 3.2.11. Final Inspection and Approval: The contractor shall notify the project biologist or ecologist in writing at least ten days prior to the requested date pf a project completion inspection. If items are to be corrected, a punch list shall be prepared by the project biologist or ecologist and submitted to the contractor for completion. After punch list items have been completed, the project biologist or ecologist shall review the project again for final acceptance of plan implementation. If punch list items require plant replacement, and the inspection occurs outside of a suitable planting season, plants shall be replaced during the next planting season. 3.2.12. As-Built Plan: Contractor is responsible for verifying plant locations and quantities on the plant schedule with those represented as symbols on the mitigation plans. Contractor shall keep a complete set of prints at the job site during construction for the purpose of recording in-the-field changes or modifications to the approved plans. This information shall be updated on a daily basis as necessary. 4. ONE YEAR CONTRACTOR WARRANTY NOTE: These maintenance specifications apply to the one-year contractor warranty period only. If this mitigation project requires long-term performance monitoring, as determined by the governing jurisdiction, the maintenance specifications and guidelines associated with the performance monitoring standards are included in the mitigation report associated with this plan set, and may also be included on a separate plan sheet if required. 4.1. Review of Maintenance Requirements: Contractor shall review landscape maintenance recommendations with a qualified biologist or ecologist who is familiar with the stated goals and objectives of the project plan. 4.2. Maintenance Activities: Contractor shall maintain trees and shrubs for a period of one year from the date of final acceptance in order to maintain healthy growth and habitat diversity. Maintenance activities shall include, but are not limited to: 4.2.1. Replacing plants due to mortality. 4.2.2. Tightening and repairing tree stakes. 4.2.3. Resettling plants to proper grades and upright positions. 4.2.4. Correcting drainage problems as required. 4.3. Irrigation: 4.3.1. System Maintenance and Repair: The contractor shall be responsible for activating, winterizing, maintaining, and continually verifying the adequate operation of the temporary irrigation system for the first growing season following installation. System function (including electronic valve and controller function) shall be inspected for operation and full coverage of all planted areas during each maintenance visit. The system shall be repaired immediately if found to be damaged for malfunctioning. System shall be programmed and maintained to provide approximately ½ inch of water every three days. 4.4. Stake and Tie Removal: Contractor shall remove tree stakes and ties one year after installation, unless receiving written permission from the project biologist or ecologist to delay removal of stakes and ties. 4.5. Erosion and Drainage: Contractor shall correct erosion and drainage problems as required. 4.6. Irrigation System Removal: Contractor shall remove irrigation system approximately 2 years after planting, or as approved by the project biologist or ecologist. 4.7. Final Maintenance Inspection and Approval: Upon completion of the one-year maintenance period, an inspection by the project biologist or ecologist shall be conducted to confirm that the project area was properly maintained. If items are to be corrected, a punch list shall be prepared and submitted to the contractor for correction. Upon correction of the punch list items, the project shall be reviewed by the project biologist or ecologist for final closeout of plan implementation. Critical Areas Mitigation PlanWoodbridge Business ParkFederal Way, WashingtonPERFORMANCE MONITORING PLANREVISIONS DATE/DESCRIPTION 2023-12-01: City Comments (206) 309 - 8100W4.0 JOB NUMBER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: #0012B JMM KAN JMM 02/12/2023 PERFORMANCE MONITORING PLAN NOTES 1. Survey and site plan provided by ESM Consulting Engineers, 33400 8th Ave S, Suite 205, Federal Way, WA 98003, (253) 838 - 6113. 2. Source drawing was modified by Wet.land for visual enhancements. 3. This Critical Areas Mitigation Plan is an attachment to the Critical Areas Addendum prepared by Wet.land dated 12 February 2023, revised 1 December 2023. 4. City of Federal Way requirements are vested to standards in effect prior to Ordinance 19-863, passed 2 January 2019.