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PLN CONIDITON - WWTP Critical Areas Report_05-07-2021 redWetland Critical Areas Report City of Edmonds Wastewater Treatment Plant Carbon Recovery Project Edmonds, Washington May 7, 2021 Prepared for City of Edmonds 121 5th Avenue North Edmonds, Washington LANDAU ASSOCIATES 130 2nd Avenue South Edmonds, WA 98020 (425) 778-0907 Attachment 7 Landau Associates Wetland Critical Areas Report City of Edmonds Wastewater Treatment Plant Carbon Recovery Project Edmonds, Washington This document was prepared by, or under the direct supervision of, the technical professionals noted below. Document prepared by: Steve Quarterman enior Associate Document reviewed by: Jeffrey Fellows, PE Principal Date: May 7, 2021 Project No.: 0074209.010.011 File path: \\edmdata0l\projects\074\209.010\R\CritAreas\EDM WWTP Critical Areas Report.docx Project Coordinator: KJG LANDAU ASSOCIATES Attachment 7 Landau Associates This page intentionally left blank. Wetland/Waterway Critical Areas Report City of Edmonds WWTP Carbon Recovery Project Attachment 7 0074209.010.011 May 7, 2021 Landau Associates EXECUTIVE SUMMARY The City of Edmonds (City) is proposing the Wastewater Treatment Plant (WWTP) Carbon Recovery Project, which will replace the sanitary sewer sludge incinerator and associated equipment at the existing facility located at 200 2nd Avenue South. The proposed replacement technology is a gas -fired belt dryer and three pyrolysis units and associated ancillary equipment. Project improvements will generally be within the footprint of the existing facility, with minor expansion/modifications on the west side of the facility. Wetlands, surface waters, and/or their buffers fall under the jurisdiction of the US Army Corps of Engineers under Section 404 of the Clean Water Act, the Washington State Department of Ecology under the Washington State Water Pollution Control Act, and the City under the critical areas regulations (Chapter 23.40) in the Edmonds Community Development Code. Landau Associates, Inc. conducted a wetland and waterway critical areas study in support of the proposed project. This report summarizes the results of the critical areas study, including a wetland delineation; an evaluation of mitigation sequencing; an assessment of unavoidable, project -related impacts; and a description of the proposed compensatory mitigation. The proposed upgrades will result in temporary and permanent impacts to wetland buffers. Temporarily impacted wetland buffers will be enhanced following construction. Permanently impacted buffer areas will be mitigated through enhancement of remaining buffer in excess of a three -to -one (3:1) enhancement -to -impact ratio. Wetland/Waterway Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project iv May 7, 2021 Attachment 7 Landau Associates MITIGATION FACT SHEET Site Information Location Wetland Impact and Mitigation Sites (same) Site Name(s) City of Edmonds Wastewater Treatment Plant County Snohomish City Edmonds Section, Township, Range Section 24, Township 27N, Range 3E Latitude, Longitude (GIS-verified) 47 48' 231"N, 122 22' 58"W Watershed Cedar-Sammamish WRIA 8 Is the mitigation site(s) off of the project development site? No Construction schedule (development site and compensation site[s]): Construction is anticipated to begin in 2021. Summary of project, including proposed type and location of work, discussion of avoidance and minimization measures, goals and objectives, wetland functions, impacted and mitigated (note assessment method used), and the general design concept (include where it has been done before). The City of Edmonds (City) is proposing the Wastewater Treatment Plant (WWTP) Carbon Recovery Project, which will replace the sanitary sewer sludge incinerator and associated equipment at the existing facility located at 200 2nd Avenue South. The proposed replacement technology is a gas -fired belt dryer and three pyrolysis units and associated ancillary equipment. Project improvements will generally be within the footprint of the existing facility, with minor expansion/modifications on the west side of the facility. Construction will occur in wetland buffer areas, which will be restored/enhanced; however, no net loss of functions will occur. Wetlands/Waterways Delineated in Project Vicinity Feature Name Approximate Feature Size within Project Area Cowardin Classification Stream Type HGM Class Ecology Rating Water Quality/ Hydrologic/Habitat Function Scores LLandscape Buffer Position Width Wetland A 0 PEM N/A Depressional 1 8,8,7 Terrace 110 feet Critical Area Impacts and Mitigation Wetland Type Feature Area Impacted (sf)-+ Restoration (sf) Ju- (Cowardin, HGM classification, Ecology Rating) Name PEM/Depressional, Category I Wetland A N/A N/A Describe other impacts and/or other mitigation activities. The proposed project will result in temporary and permanent impacts to wetland buffer associated with facility modifications and access improvements. Exterior improvements to the WWTP in wetland buffer will occur on the west side of the building associated with a new loading dock and access improvements. The loading dock will include temporary and permanent components, where the temporary component will occur in SR 104 right-of-way and the permanent component will occur on City property. The permanent component of the loading dock will be 12 feet (ft) by 12 ft (144 square feet [sf]) consisting of structural platform consisting of either fiberglass, wood, or steel with a wood or composite deck. The temporary component of the loading dock is 12 ft by 13 ft (156 sf) and may be reinstalled as needed in support of project maintenance activities following construction. To compensate for impacts to wetland/waterway buffer functions that have occurred, a planting plan has been designed that will enhance the wetland buffer complex on site post construction. The planting plan covers 1,255 sf, which provides mitigation at a ratio of 4.2:1, which is in excess of the 3:1 ratio. Trees to be removed as part of construction will be placed in the wetland buffer to serve as downed large wood. Describe the buffers being provided for the mitigation site, including minimum and maximum width, total buffer area, and description of surrounding land uses. Existing buffer area outside of permanent impacts are maintained and will be restored/enhanced adjacent to the project. Describe the water regime at the mitigation site(s), including source of water, expected water depth, average outflow (winter, spring, summer), and ownership of water rights. N/A. Provide a list of performance standards and the estimated time to reach each. Refer to Section 5.4 for performance standards related to plant survival, species diversity, invasive species, and structural diversity. Monitoring will occur over a 5-year period following construction and plant installation. Abbreviations and Acronyms: N/A = not applicable PEM = Palustrine emergent WRIA = Water Resource Inventory Area Wetland/Waterway Critical Areas Report City of Edmonds WWTP Carbon Recovery Project Attachment 7 0074209.010.011 May 7, 2021 Landau Associates TABLE OF CONTENTS Page ExecutiveSummary..................................................................................................................................iii MitigationFact Sheet...............................................................................................................................iv 1.0 INTRODUCTION..............................................................................................................................1-1 1.1 Site Description..................................................................................................................1-1 1.2 Regulatory Background......................................................................................................1-1 2.0 METHODS.......................................................................................................................................2-1 2.1 Wetland Investigation........................................................................................................2-1 2.1.1 Background Information Review......................................................................2-1 2.1.2 Wetland Delineation........................................................................................2-1 2.2 Wetland Classification and Buffer Width Determination...................................................2-2 2.3 Waterway Delineation........................................................................................................2-3 2.4 Impact Assessment.............................................................................................................2-3 2.5 Mitigation Sequencing........................................................................................................2-3 3.0 WETLAND AND WATERWAY INVESTIGATION RESULTS.................................................................3-1 3.1 Background Information Review........................................................................................3-1 3.1.1 Waterways.......................................................................................................3-1 3.1.2 Wetlands.........................................................................................................3-1 3.1.3 Soils.................................................................................................................3-1 3.1.4 Floodplain........................................................................................................3-1 3.1.5 Land Use..........................................................................................................3-2 3.1.6 Precipitation....................................................................................................3-2 3.2 Field Investigation..............................................................................................................3-2 3.2.1 Wetland A........................................................................................................3-2 3.2.1.1 Vegetation.................................................................................................3-2 3.2.1.2 Soil............................................................................................................3-2 3.2.1.3 Hydrology..................................................................................................3-2 3.2.1.4 Wetland Determination.............................................................................3-3 3.2.1.5 Upland Characterization............................................................................3-3 4.0 IMPACT ASSESSMENT .................................................................................................................... 4-1 5.0 MITIGATION...................................................................................................................................5-1 5.1 Mitigation Sequencing........................................................................................................5-1 5.1.1 Avoidance........................................................................................................5-1 5.1.2 Minimization...................................................................................................5-1 5.2 Unavoidable Impacts..........................................................................................................5-1 5.2.1 Mitigation Requirements.................................................................................5-1 5.1 Planting Plan.......................................................................................................................5-2 5.1.1 Vegetation and Spacing...................................................................................5-2 Wetland/Waterway Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project vi May 7, 2021 Attachment 7 Landau Associates 5.2 6.0 6.1 6.2 6.3 6.4 7.0 8.0 9.0 Figure 1 2 3 4 5 Table 1 5.1.2 Other Habitat Improvements...........................................................................5-3 5.1.3 Project Phasing and Specifications...................................................................5-3 5.1.4 Proposed Enhanced Functions.........................................................................5-3 Mitigation Goals, Objectives, and Performance Standards...............................................5-4 MONITORING, MAINTENANCE, AND SITE PROTECTION................................................................6-1 Monitoring Quality Control Oversight................................................................................6-1 Monitoring/Site Maintenance Program.............................................................................6-1 SiteProtection....................................................................................................................6-1 ContingencyPlan................................................................................................................6-2 CONCLUSION AND ASSESSMENT OF NO NET LOSS.......................................................................7-1 USE OF THIS REPORT......................................................................................................................8-1 REFERENCES................................................................................................................................... 9-1 FIGURES Title Vicinity Map Study Area Map Wetland Location Map Wetland Buffer Impact Map Enhancement Plan 0II:11.14 ►1 Title Methods for Wetland Delineation APPENDICES Appendix Title A Background Information Review Figures B Soil Profile Reports C Precipitation Data D Wetland Determination Data Forms E Selected Site Photographs F Wetland Rating Forms and Figures G ECDC 23.50.040(F)(1)(f) - Required Measures to Minimize Impacts to Wetlands H Mitigation Planting Specifications Wetland/Waterway Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project vii May 7, 2021 Attachment 7 Landau Associates LIST OF ABBREVIATIONS AND ACRONYMS AgACIS .................................................Agricultural Applied Climate Information System bgs................................................................................................. below ground surface City.........................................................................................................City of Edmonds ECDC............................................................... Edmonds Community Development Code Ecology........................................................... Washington State Department of Ecology FAC.................................................................................................................. facultative FACU................................................................................................... facultative upland FACW................................................................................................ facultative wetland FEMA............................................................... Federal Emergency Management Agency ft....................................................................................................................... foot/feet GIS.............................................................................. Geographic Information Software HGM.................................................................................................... hydrogeomorphic HPA....................................................................................... Hydraulic Project Approval LAI............................................................................................... Landau Associates, Inc. N/A............................................................................................................ not applicable NAVD88.............................................................North American Vertical Datum of 1988 NRCS..................................................................Natural Resources Conservation Service NWI.................................................................................... National Wetlands Inventory NWIFC............................................................... Northwest Indian Fisheries Commission OBL......................................................................................................................obligate OHWM.................................................................................... ordinary high water mark PEM................................................................................................. Palustrine emergent PSSC............................................................ palustrine, scrub/shrub, seasonally flooded RCW................................................................................... Revised Code of Washington ROW............................................................................................................. right-of-way sf................................................................................................square foot/square feet SMP........................................................................................Shoreline Master Program SR.................................................................................................................. State Route SWIFD.............................................. Statewide Washington Integrated Fish Distribution USACE................................................................................ U.S. Army Corps of Engineers USDA.............................................................................. U.S. Department of Agriculture USFWS................................................................................ U.S. Fish and Wildlife Service WAC............................................................................ Washington Administrative Code WDFW.......................................................... Washington Department of Fish & Wildlife WRIA..............................................................................Water Resource Inventory Area WWTP................................................................................Wastewater Treatment Plant Wetland/Waterway Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project viii May 7, 2021 Attachment 7 Landau Associates This page intentionally left blank. Wetland/Waterway Critical Areas Report City of Edmonds WWTP Carbon Recovery Project Attachment 7 0074209.010.011 May 7, 2021 Landau Associates 1.0 INTRODUCTION The City of Edmonds (City) is proposing the Wastewater Treatment Plant (WWTP) Carbon Recovery Project (project), which will replace the sanitary sewer sludge incinerator and associated equipment at the existing facility located at 200 2nd Avenue South (Figure 1). The proposed replacement technology is a gas -fired belt dryer and three pyrolysis units and associated ancillary equipment. Project improvements will generally be within the footprint of the existing facility, with minor expansion/modifications on the west side of the facility. Landau Associates, Inc. (LAI) conducted a wetland and waterway critical areas study in support of the proposed project. This report summarizes the results of the critical areas study, including a wetland delineation; an evaluation of mitigation sequencing; an assessment of unavoidable, project -related impacts; and a description of the proposed compensatory mitigation. The proposed project will result in temporary and permanent impacts to wetland buffers. Temporarily impacted wetland buffers will be enhanced following construction, and permanent impacts will be mitigated through enhancement of existing buffer area and will not result in a net loss of buffer functions. 1.1 Site Description The approximately 2,600 square -foot (sf) project area is located in Section 24, Township 27N, Range 3E and in Water Resource Inventory Area 8 — Cedar/Sammamish, in Washington State. The project area is developed with the existing WWTP facility (Figure 2). Topography in the vicinity of the project area is relatively flat. The study area extends 200 feet (ft) beyond the project area (Figure 2). Visual observation and public domain resources were used to estimate the extent of wetland/waterway habitat in the study area. Review of the study area was limited to observation from public rights -of -way (ROW). 1.2 Regulatory Background Section 404 of the federal Clean Water Act requires the US Army Corps of Engineers (USACE) to authorize the discharge of dredged or fill material into "waters of the United States." Title 23.50 and 23.90 of the City of Edmonds Community Development Code (ECDC) contain requirements for establishing wetland and stream buffer widths and building setbacks as well as requirements for alterations made within or adjacent to fish and wildlife habitat conservation areas, including filling of wetlands, streams, and their buffers. The Washington State Department of Ecology (Ecology) requires compliance with the State Water Pollution Control Act (Chapter 90.48 of the Revised Code of Washington [RCW]). Ecology oversees the administration of Section 401 of the Clean Water Act, which holds that a water quality certification Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 1-1 May 7, 2021 Attachment 7 Landau Associates must be issued for any activities that may result in a discharge into USACE jurisdictional "waters of the United States." Any work that will use, divert, obstruct, or change the bed or flow of state waters, including streams and rivers, must be authorized by a Hydraulic Project Approval (HPA) permit, issued by the Washington Department of Fish & Wildlife (WDFW). The WDFW HPA is administered under Chapter 77.55 RCW and Chapter 220-660 of the Washington Administrative Code (WAC). Wetlands and certain waterways are regulated by federal, state, and local government agencies, and compliance with the permitting requirements of one agency does not necessarily fulfill the requirements of the other agencies. The delineated wetlands and/or waterways described in this report are subject to verification by the USACE. The USACE determines the jurisdiction of a wetland based on its connection, or adjacency, to other "waters of the United States." Only the USACE can determine if a wetland is adjacent or isolated. Isolated wetlands do not fall under the jurisdiction of the USACE but may be subject to regulation by Ecology under the State Water Pollution Control Act (RCW 90.48). If delineated wetlands are determined to be adjacent rather than isolated, filling or dredging of onsite wetlands would require compliance with Sections 404 and 401 of the Clean Water Act. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 1-2 May 7, 2021 Attachment 7 Landau Associates 2.0 METHODS LAI reviewed publicly available information, completed a wetland and waterway delineation and impact assessment for the proposed project, and prepared a mitigation plan for project -related impacts to critical areas in accordance with the methods described below. 2.1 Wetland Investigation LAI conducted the wetland delineation in accordance with the Corps of Engineers Wetland Delineation Manual (USACE 1987) and Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (2010). Waterways were delineated using Ecology's Determining the Ordinary High Water Mark for Shoreline Management Act Compliance in Washington State (2016). The USACE and Ecology recommend preliminary data -gathering and synthesis of available background information followed by a field investigation. 2.1.1 Background Information Review LAI reviewed the following public domain resources to identify existing conditions, potential wetlands and other "waters of the United States," and other critical areas within the study area: • US Geological Survey topographic map (Appendix A, Figure A-1) • Aerial imagery (Google Earth, accessed April 12, 2021)1 • National Wetlands Inventory (NWI) map (accessed April 12, 2021; Appendix A, Figure A-2) • Soil survey geographic database and soil survey report (US Department of Agriculture Natural Resources Conservation Service [USDA NRCS], accessed February 28, 2020; Appendix A, Figure A-3) • National Hydric Soils List (USDA NRCS 2021; accessed April 12, 2021) • City of Edmonds critical areas map (City of Edmonds; accessed April 12, 2021) • City of Edmonds Shoreline Master Program (SMP) • Statewide Washington Integrated Fish Distribution dataset (WDFW Northwest Indian Fisheries Commission [NWIFC], accessed April 12, 2021) • Flood data (Federal Emergency Management Agency [FEMA] 2020; Appendix A, Figure A-4) • Precipitation data (Agricultural Applied Climate Information System [AgACIS], accessed April 12, 2021). 2.1.2 Wetland Delineation An LAI biologist completed the wetland delineation using the routine onsite method, where data are collected at locations representative of typical wetlands and/or uplands. An area is determined to be a wetland if the following three criteria are met using this method (attached Table 1): 1 Website: https://www.google.com/earth/. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 2-1 May 7, 2021 Attachment 7 Landau Associates • The dominant vegetation is hydrophytic • Soils are hydric • Wetland hydrology is present. 2.2 Wetland Classification and Buffer Width Determination Wetlands identified within the project area were classified in accordance with the U.S. Fish and Wildlife Service's (USFWS) Cowardin classification system (Cowardin et al. 1979) and the USACE's hydrogeomorphic (HGM) classification system (Brinson 1993). Wetlands were rated in accordance with the Washington State Wetland Rating System for Western Washington: 2014 Update (Hruby 2014), a practice accepted by the City. This system is used to categorize wetlands based on their existing functions, including water quality, hydrology, and habitat, as well as their rarity, sensitivity to disturbance, or irreplaceability. Wetland categories range from 1 to 4 (highest to lowest categories) and are defined in Chapter 23.50.010 of the ECDC as follows: Category I wetlands are: (a) relatively undisturbed estuarine wetlands larger than one acre; (b) wetlands of high conservation value that are identified by scientists of the Washington Natural Heritage Program/Washington State Department of Natural Resources (DNR); (c) bogs; (d) mature and old -growth forested wetlands larger than one acre; (e) wetlands in coastal lagoons; (f) interdunal wetlands that score eight or nine habitat points and are larger than one acre; and (g) wetlands that perform many functions well (scoring 23 points or more). These wetlands: (a) represent unique or rare wetland types; (b) are more sensitive to disturbance than most wetlands; (c) are relatively undisturbed and contain ecological attributes that are impossible to replace within a human lifetime; or (d) provide a high level of functions. • Category II wetlands are: (a) estuarine wetlands smaller than one acre, or disturbed estuarine wetlands larger than one acre; (b) interdunal wetlands larger than one acre or those found in a mosaic of wetlands; or (c) wetlands with a moderately high level of functions (scoring between 20 and 22 points). Category III wetlands are: (a) wetlands with a moderate level of functions (scoring between 16 and 19 points); (b) can often be adequately replaced with a well -planned mitigation project; and (c) interdunal wetlands between one -tenth and one acre. Wetlands scoring between 16 and 19 points generally have been disturbed in some ways and are often less diverse or more isolated from other natural resources in the landscape than Category II wetlands. Category IV wetlands have the lowest levels of functions (scoring fewer than 16 points) and are often heavily disturbed. These are wetlands that should be capable of being replaced, or in some cases being improved. However, experience has shown that replacement cannot be guaranteed in any specific case. These wetlands may provide some important functions and should be protected to some degree. Wetland buffers were determined in accordance with Chapter 23.50.040 of the ECDC. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 2-2 May 7, 2021 Attachment 7 Landau Associates 2.3 Waterway Delineation The ordinary high water mark (OHWM) determination for waterways was completed using guidance developed by Ecology (2016). The delineation of the OHWM is based on site observations. The methodology includes an examination of existing hydrologic data and field indicators for hydrology, sediment, scour marks, changes in vegetation, etc. 2.4 Impact Assessment Project improvement limits were overlaid on the waterway and buffer boundaries using Geographic Information System (GIS) software. Areas of impact (both temporary and permanent) were calculated using GIS. Existing buffer functions were assessed with a narrative evaluation and best professional judgment. 2.5 Mitigation Sequencing Mitigation sequencing for wetlands and associated buffers was evaluated in accordance with ECDC Chapter 23.40.120. The evaluation included avoidance, minimization, and mitigation of adverse impacts. Mitigation methods must be prioritized as follows: 1. Avoiding the impact altogether by not taking a certain action or parts of an action 2. Minimizing impacts by limiting the degree or magnitude of the action and its implementation by using appropriate technology or by taking affirmative steps, such as project redesign, relocation, or timing to avoid or reduce impacts; 3. Rectifying the impact to wetlands, frequently flooded areas, and fish and wildlife habitat conservation areas by repairing, rehabilitating, or restoring the affected environment to the historical conditions or the conditions existing at the time of the initiation of the project; 4. Minimizing or eliminating the hazard by restoring or stabilizing the hazard area through engineering or other methods; 5. Reducing or eliminating the impact or hazard over time by preservation and maintenance operations during the life of the action; 6. Compensating for the impact to wetlands, frequently flooded areas, and fish and wildlife habitat conservation areas by replacing, enhancing, or providing substitute resources or environments; and/or 7. Monitoring the hazard or other required mitigation and taking remedial action when necessary. LAI used best professional judgment to compare pre- and post -mitigation functions. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 2-3 May 7, 2021 Attachment 7 Landau Associates 3.0 WETLAND AND WATERWAY INVESTIGATION RESULTS This section summarizes the results of LAI's background information review and field investigation. 3.1 Background Information Review Background information was derived from topographic, City, NWI, soil survey reports, and other sources documenting conditions in, and adjacent to, the project area. 3.1.1 Waterways The USGS topographic map (USGS, accessed April 12, 2021; Appendix A, Figure A-1), NWI map (USFWS, accessed April 12, 2021; Appendix A, Figure A-2), and City critical areas map do not identify any waterways in the study area. 3.1.2 Wetlands The USGS topographic map (USGS, accessed April 12, 2021; Appendix A, Figure A-1) identifies an area south of the WWTP in the study area as marsh; City critical areas mapping identifies a similar extent as wetland, which is also identified as an associated wetland under the City's SMP. The NWI map (USFWS, accessed April 12, 2021; Appendix A, Figure A-2) identifies a portion of the mapped wetland as palustrine, scrub/shrub, seasonally flooded (PSSC) wetland. 3.1.3 Soils The Web Soil Survey (USDA NRCS, accessed April 12, 2021) identifies the following three soil series within the study area (Appendix A, Figure A-3; Appendix B): The Alderwood (5) series consists of moderately well -drained, gravelly, sandy loam to very gravelly, sandy loam. Parent material is glacial drift and/or glacial outwash overlying dense glaciomarine deposits. This soil series map unit has a hydric rating where components of the McKenna, Norma, or Terric Medisprists series are present in depressions (USDA NRCS, accessed April 12, 2021). • The Mukilteo (34) series consists of very poorly drained muck. Parent material is organic deposits and depth to seasonal water table may range at the surface to a depth of 30 centimeters. This soil series has a hydric rating (USDA NRCS, accessed April 12, 2021). • Urban Land (5, 78) consists of nearly level to gently sloping areas covered by streets, buildings, parking lots, and other structures that obscure or alter the soils (USDA NRCS 1983). This soil series is not rated as hydric (USDA NRCS, accessed April 12, 2021). 3.1.4 Floodplain FEMA mapping (2020; Appendix A, Figure A-4) identifies a 100-year floodplain associated with the Puget Sound coast within the study area, with associated base flood elevation of 12 ft North American Vertical Datum of 1988 (NAVD88). Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 3-1 May 7, 2021 Attachment 7 Landau Associates 3.1.5 Land Use A review of Google Earth aerial imagery (accessed March 6, 2020) indicates that the study area is developed with roadways and public utilities and includes undeveloped area to the south of the WWTP (Figure 2). 3.1.6 Precipitation During the 3 months preceding the field investigation, precipitation levels in the project area were wetter than normal (AgACIS, accessed March 6, 2020; Appendix C). 3.2 Field Investigation LAI Senior Associate Steven Quarterman conducted a field investigation of the study area on February 27, 2021. Temperatures ranged from 40 to 50 degrees Fahrenheit with clear weather conditions. Two sampling points (SP-1 and SP-2) were established in the study area to characterize hydrology, vegetation, and soil in wetland area and adjacent upland. The wetland determination data forms used to record field observations are included in Appendix D. Selected site photographs are provided in Appendix E, and wetland rating forms are provided in Appendix F. 3.2.1 Wetland A Wetland A (Figure 3) is located south of the WWTP and extends beyond the study area. Wetland A is identified on USGS topographic mapping and City critical areas and SMP maps. Sample point SP-1 was established to characterize Wetland A. 3.2.1.1 Vegetation Wetland A is dominated by hydrophytic vegetation. Red alder (Alnus rubra, facultative [FAC]), Himalyan blackberry (Rubus armeniacus, FAC), and water parsley (Oenanthe sarmentosa, obligate [OBL]) were the dominant plant species in sample point SP-1, and additional species observed in the wetland include broad leaf cattail (Typha latifolia, OBL). 3.2.1.2 Soil Soil at sample point SP-1 satisfied the hydric soils criteria as a loamy gleyed matrix (F2). The soil profile consisted of an organic layer from 0 to 1 inch below ground surface (bgs), underlain by a dark bluish grey (5 PB 4/1) loamy sand from at least 1 to 12 inches bgs. 3.2.1.3 Hydrology In Wetland A, Surface Water (Al), High Water Table (A2), Saturation (A3), and Water Marks (131) were the primary indicators of wetland hydrology. Wetland A hydrology is predominantly supplied by precipitation and groundwater, and a segment of Shellabarger Creek flows through the wetland Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 3-2 May 7, 2021 Attachment 7 Landau Associates outside of the study area. Wetland A drains toward the east and north. Discharges to the east are conveyed via a culvert under State Route (SR) 104 to Edmonds Marsh and to the north via a culvert adjacent to SR 104 that conveys drainage in the City's stormwater system to the Puget Sound. 3.2.1.4 Wetland Determination Wetland A satisfies the three wetland criteria in Section 2.1.2, and LAI has classified the wetland as a Palustrine emergent (Cowardin et al. 1979)/depressional (HGM) wetland. LAI provided Wetland A with a Category I wetland rating, with a total score of 23. Wetland A water quality and hydrologic functions both received a score of 8, and habitat functions received a score of 7. In accordance with ECDC Chapter 23.50.040.F, Category I wetlands associated with a habitat score of 7 are prescribed a buffer of 110 ft.z 3.2.1.5 Upland Characterization Data gathered at sampling point SP-2 (Figure 3) were used to characterize the upland area near Wetland A. None of the three mandatory wetland parameters were satisfied and the area was classified as upland. The dominant vegetation at sampling point SP-2 included red alder (FAC) and indian plum (Oemleria cerosiformis, facultative upland [FACU]). Other vegetation in the vicinity of sampling point SP-2 included maintained landscaping in vicinity of the WWTP and SR 104. At sampling point SP-2, brown (10YR 4/3), loam was observed from 0 to 12 inches bgs, and gravel was encountered at 12 inches bgs that prevented further access to the soil profile. z Buffer width prescribed in accordance with ECDC 23.50.040(F)(1)(a), in which the option for a 100-ft vegetated corridor is not available due to adjacent developments to the wetland and measures provided in (F)(1)(f), are applied as summarized in Appendix G. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 3-3 May 7, 2021 Attachment 7 Landau Associates 4.0 IMPACT ASSESSMENT Unavoidable impacts to wetlands, waterways, and buffers are described below. Impacted Critical Area Regulatory Agency Impacts (sf) Permanent Impact Temporary Impact Wetland A USACE/City 0 0 Wetland A Buffer City 300 sf 1,095 sf Total Wetland Buffer Impacts 300 sf 1,095 sf Abbreviations and Acronyms: City = City of Edmonds sf = square feet USACE = US Army Corps of Engineers The proposed project will result in temporary and permanent impacts to wetland buffer associated with facility modifications and access improvements. Exterior improvements to the WWTP in wetland buffer will occur on the west side of the building associated with a new loading dock and access improvements (i.e., wall openings; see Appendix H). The loading dock will include temporary and permanent components, where the temporary component will occur in SR 104 ROW and the permanent component will occur on City property. The permanent component of the loading dock will be a 12-ft by 12-ft (144 sf) structural platform consisting of either fiberglass, wood, or steel with a wood or composite deck. The temporary component of the loading dock is 12 ft by 13 ft (156 sf) and may be reinstalled as needed in support of project maintenance activities following construction. The temporary segment of the loading dock is considered part of permanent impacts since it may be reinstalled during project maintenance. The area of permanent impact contains non-native and invasive species, consisting of: • St. Johns wort (Hypericum calycinum), • Portugal laurel (Prunus lusitanica), and • landscape variety of maple tree (Acer sp). Two of the maples in the buffer will be removed as a result of construction. The area of the proposed loading dock contains one maple and sparse ground cover (see Appendix E, Photograph 3). A second wall opening will occur on the southwest corner of the building, facing south. Modification of vegetation in the buffer, limited to trimming of shrub landscaping within approximately 5 ft of the existing building, is expected to provide access to the wall opening. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 4-1 May 7, 2021 Attachment 7 Landau Associates 5.0 MITIGATION This section outlines a mitigation sequence and mitigation plan for unavoidable impacts to wetlands, waterways, and associated buffers. 5.1 Mitigation Sequencing ECDC Chapter 23.40.120 includes requirements for mitigation of impacts to critical areas. The mitigation sequence methods for avoidance and minimization are described below. 5.1.1 Avoidance The proposed upgrades have been designed to avoid temporary and permanent impacts to Wetland A. 5.1.2 Minimization To minimize impacts, best management practices will be employed during construction to limit erosion and accidental spills (e.g., temporary erosion and sedimentation control plan). In addition, the permanent segment of the loading dock will be located in an area that does not currently have native vegetation and is largely lacking ground cover. In addition, the loading dock structure will be a platform that will retain the underlying soils allowing for surface runoff to flow beneath the structure for potential infiltration. The temporary portion of the loading dock will only be in place when needed during project maintenance, and surface runoff can continue to infiltrate in the area. 5.2 Unavoidable Impacts Given the extent and location of Wetland A buffer relative to the WWTP, impacts to functional buffers cannot be avoided. Unavoidable project impacts are limited to clearing of vegetation to provide access during construction and installation of 12-ft by 12-ft portion of the loading dock and maintenance of the area of the 12-ft by 13-ft section of the temporary segment of the loading dock. The temporary segment of the loading dock is considered part of permanent impacts since it may be reinstalled during project maintenance. 5.2.1 Mitigation Requirements Proposed mitigation of wetland buffer impacts will include enhancement, in accordance with ECDC Chapter 23.40.120: "Compensating for the impact ... by replacing, enhancing, or providing substitute resources or environments." ECDC 23.50.040(I)(1) allows for additions to legally constructed structures existing within wetlands or wetland buffers provided that an enhancement plan is prepared. Such additions are subject to the following sequence (project evaluation is provided following criteria): Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 5-1 May 7, 2021 Attachment 7 Landau Associates a) Outside of the standard wetland buffer; The proposed addition cannot be located outside of the buffer due to location of equipment within the WWTP. b) Outside of a wetland buffer averaged (with enhancement) per subsection (G)(3) of this section; Wetland buffer averaging is not feasible due to the extent of existing developments in the project vicinity. c) Outside of a wetland buffer reduced (with enhancement) per subsection (G)(4) of this section; Not applicable. Subsection (G)(4) is not applicable to Category I wetlands. d) Outside of the inner 25 percent of the standard wetland buffer width with no more than 300 square feet of structure addition footprint within the inner 50 percent of the standard wetland buffer width; provided, that enhancement is provided at a minimum three -to -one (3:1) ratio (enhancement -to -impact); The proposed project occurs outside of the inner 50 percent standard buffer width of Wetland A (see Figure 4). The proposed mitigation plan provides buffer enhancement in excess of 3:1, refer to Planting Plan in the following section. e) Outside of the inner 25 percent of the standard wetland buffer width with no more than 500 square feet of new footprint within the inner 50 percent of the standard wetland buffer width; provided, that enhancement is provided at a minimum five -to -one (5:1) ratio (enhancement -to - impact), and that stormwater low impact development (LID) techniques and other measures are included as part of the wetland/buffer enhancement plan. Not applicable; refer to criteria (d) above. 5.1 Planting Plan To compensate for impacts to wetland/waterway buffer functions that have occurred, a planting plan has been designed that will restore and enhance the wetland buffer complex on site post construction. The planting plan covers 1,255 sf, providing mitigation at a ratio of 4.2:1 (including area of temporary loading dock), which is in excess of the 3:1 ratio referenced in ECDC Chapter 23.50.040(I)(1)(d). The planting plan, as well as project phasing, is presented in this section. 5.1.1 Vegetation and Spacing The planting plan is designed to restore wetland buffer habitat and water quality functions and provide enough shade to control the spread of invasive species. The planting plan is based on an average density of one tree or shrub per 6 ft on center, plus groundcover. Vegetation planting is limited to the designated buffer enhancement area (Figure 5). One native tree species, four native shrub species, and native groundcover have been selected to supplement the existing native species near the project site. These species have been chosen not only for their ability to tolerate site -specific soil and moisture conditions, but also for their ability to provide wildlife forage, habitat, and erosion control functions. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 5-2 May 7, 2021 Attachment 7 Landau Associates The layout of the plant communities was designed to maximize interspersion of species. The layout of plants will include informal and irregular groupings to resemble naturally occurring plant assemblages. Because of the complexity of site topography, existing soils, and work within wetland buffer areas, as well as the importance of retaining existing desirable vegetation, the actual layout of plants will be determined by a biologist (qualified City staff or hired consultant)representing the City. Species selected for the planting plan include: • Shore pine (Pinus contorta) • Flowing currant (Ribes sanguineum) • Vine maple (Acer circinatum) • Pacific rhododendron (Rhododendron macrophyllum) • Salal (Gaulthoria shallon) • Native grass seed mix. 5.1.2 Other Habitat Improvements In addition to the planting plan, trees to be removed during construction will be placed in the wetland buffer to serve as habitat features (i.e., downed large wood). The placement of the downed trees will be coordinated with the City, with preference for placement in the buffer area south of the public trail adjacent to the WWTP. 5.1.3 Project Phasing and Specifications Detailed specifications suggested for implementing the buffer enhancement are included in Appendix H. A summary of the construction sequencing for the mitigation project is as follows: 1. Mark planting area in field 2. Mobilize construction equipment and materials to the project site, as needed 3. Clear all invasive species and other material and obstructions identified on plans/specifications 4. Place downed trees in buffer outside of project area 5. Complete facility construction activities 6. Complete planting area site preparation and layout for approval by biologist 7. Complete plant installation 8. Complete cleanup and as -built survey/markup. 5.1.4 Proposed Enhanced Functions Pre -impact function levels at the project site were estimated by comparing the site with surrounding buffer areas. This evaluation was informed by the document Wetland Mitigation in Washington State Part 1: A Synthesis of the Science (Ecology 2005) and best professional judgment given specific indicators. Functions typically associated with wetland buffers include water quality (removing Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 5-3 May 7, 2021 Attachment 7 Landau Associates sediment, nutrients, toxins and pathogens, and maintaining microclimate) and habitat (species richness, structural diversity/cover classes, visual screening from adjacent human development, and habitat connectivity). The mitigation plan includes enhancing the impacted functions of the wetland buffer, specifically the water quality and habitat functions, through removal of invasive species; planting of native ground covers, shrubs, and trees; and placement of large, downed wood in the buffer. The planting plan includes a diverse assemblage of native vegetation that will provide species and structural diversity. 5.2 Mitigation Goals, Objectives, and Performance Standards Goals are broad statements that generally define the intent or purpose of the proposed mitigation. Objectives specify the direct actions necessary to achieve the stated goals. Performance standards are the measurable values of specific variables that ensure objectives have been met. They provide the basis for determining if mitigation is a regulatory success. One main goal has been outlined for this effort: • Goal #1: Compensate for impacts to wetland buffer functions incurred by temporary and permanent clearing in the Wetland A buffer. — Objective A: Increase native species diversity in the impacted buffer area. ■ Performance Standard 1A: Plant Survival - at the end of Year 1, there will be 100 percent survival of installed vegetation. There will be 80 percent survival of installed woody species in subsequent monitoring years. Appropriate volunteer species will be counted for each dead or missing plant. ■ Performance Standard 2A: Species Diversity - at the end of each monitoring year, at least four desirable native or introduced species will represent 10 percent or more cover. Performance Standard 3A: Invasive Species — total cover of invasive species will be 10 percent or less in each year of monitoring. — Objective B: Increase structural diversity of the buffer area. ■ Performance Standard 1B: Vegetation Stratum in the enhancement area — in the final year of monitoring, species cover of herbaceous, shrub, and tree species will represent at least 80 percent cover, with each stratum providing a minimum of 10 percent cover. Performance Standard 2B: Downed large wood — as -built plan (i.e., Year 0) will document that at least two trees removed as a result of construction have been placed in the wetland buffer. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 5-4 May 7, 2021 Attachment 7 Landau Associates 6.0 MONITORING, MAINTENANCE, AND SITE PROTECTION Monitoring and maintenance are important elements for the success of the restoration project. The proposed restoration will be monitored during and after completion of the initial construction work, as described below. 6.1 Monitoring Quality Control Oversight During earthwork and plant installation, a qualified biologist/City representative will verify that grade and soil conditions are correct per specifications, plant materials are healthy and consist of the correct species and sizes as designated on the planting plan, and that they are placed in the correct growing environments. When plant installation is complete, the biologist/City representative will conduct an inspection and provide detailed notes on any changes to the final mitigation plan. This "as -built" plan will serve as the baseline for monitoring, and the monitoring period will commence when the City's biologist approves the "as -built" plan. The final checklist will be used to document that specifications have been met. 6.2 Monitoring/Site Maintenance Program The City will monitor the success of the plantings, in years 1, 3, and 5 throughout a 5-year period, as required by ECDC Chapter 23.40.130(D). Landscape maintenance by the City will occur as needed for successful establishment of the plantings. While plant species chosen for this mitigation proposal are adapted to conditions in western Washington, supplemental irrigation is recommended during the first three growing seasons following installation to promote long-term survival of the planted communities.3 The primary maintenance activities that may be required within the mitigation area are irrigation and/or removal of nuisance species. Noxious weeds listed on the Washington State Noxious Weed Control Board list (NWCB 2018) and occurring within the easement should be hand -weeded from the planted areas for the duration of the monitoring period. Plants installed for mitigation will be replaced, as needed. 6.3 Site Protection In accordance with the ECDC, as a condition of any permit or authorization, the Planning Director may require the applicant to install permanent or temporary signs along the boundary of a wetland or buffer. The placement of such signs may be limited because only a portion of Wetland A and associated buffer is located on City property, and the site is not an active use area (i.e., undeveloped property and not promoted for public recreational use). These limitations would reduce the effectiveness of permanent signs, and no permanent signs are proposed for this project. a The proposed planting area is contiguous with landscaping located outside of the critical area buffer. An irrigation plan is not included in this critical areas documentation, and it is assumed the City (or its Contractor) will include irrigation design with the overall project plan, and will include the proposed buffer enhancement area. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 6-1 May 7, 2021 Attachment 7 Landau Associates 6.4 Contingency Plan A contingency plan may be necessary if monitoring determines that the mitigation is not successfully meeting performance standards. In this case, the monitoring report will include a discussion of potential cause for failure to meet performance standards and will recommend appropriate actions to address the problem. The proposed contingency actions will depend on the problem being addressed. For example, if all plants of a single species die, a more appropriate replacement species will be determined for the site conditions. If invasive species out -compete the native vegetation, additional control efforts may be warranted. Under certain conditions, irrigation may be necessary. If implementation of a contingency plan is deemed necessary, all proposed actions will be planned and submitted to the City for approval before they are implemented. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 6-2 May 7, 2021 Attachment 7 Landau Associates 7.0 CONCLUSION AND ASSESSMENT OF NO NET LOSS The City is proposing the WWTP Carbon Recovery Project, which will replace the sanitary sewer sludge incinerator and associated equipment at the existing facility, resulting in unavoidable wetland buffer impacts. The mitigation plan presented in this report meets City requirements, as outlined in the ECDC. The plans and performance standards presented in this report will mitigate for impacts to wetland buffer areas by the proposed project. Thus, the proposed project will restore and enhance buffer function so that the site will have incurred no net loss of wetland buffer functions. The mitigation plan includes monitoring and maintenance duties and schedules to promote its success. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 7-1 May 7, 2021 Attachment 7 Landau Associates 8.0 USE OF THIS REPORT The findings presented herein are based on Landau Associates' understanding of the Edmonds Community Development Code and wetland/waterway delineation methodology developed by the US Army Corps of Engineers and Washington State Department of Ecology. Findings are also based on Landau Associates' interpretation of the vegetative, soil, and hydrologic conditions observed during the February 15, 2021 site visit. Within the limitations of scope, schedule, and budget, findings accord with generally accepted sensitive area -investigation principles and practices in this locality, at the time the report was prepared. Landau Associates makes no other warranty, either express or implied. This report was prepared for the use of the City of Edmonds and applicable regulatory agencies. No other party is entitled to rely on the information, conclusions, and recommendations included in this document without the express written consent of Landau Associates. Further, the reuse of information, conclusions, and recommendations provided herein for extensions of the project or for any other project, without review and authorization by Landau Associates, shall be at the user's sole risk. Wetland/waterways delineations are considered preliminary until approved by the US Army Corps of Engineers and/or local jurisdictional agencies. Because wetlands and waterways are dynamic communities, their boundaries may change over time. Regulatory agencies typically honor delineations for 5 years after an approved jurisdictional determination. In addition, changes in government code, regulations, and/or laws could affect wetland boundaries and/or the ways in which delineations or ratings are conducted. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 8-1 May 7, 2021 Attachment 7 Landau Associates 9.0 REFERENCES AgACIS. Precipitation Data. Agriculture Applied Climate Information System. Accessed March 6, 2020. Available online at: http://agacis.rcc-acis.org/. Brinson, M.M. 1993. A Hydrogeomorphic Classification for Wetlands. Technical Report WRP-DE-4. Vicksburg, MS: U.S. Army Corps of Engineers Engineer Waterways Experiment Station. City of Edmonds. City of Edmonds, GIS. Available online at: https.Ilmaps.edmondswo.govlHtm15Viewerl?viewer=Edmonds SSL.HTML. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. La Roe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. Publication No. FWS/OBS-79-31. US Fish & Wildlife Service, US Department of the Interior. December. Ecology. 2005. Wetland Mitigation in Washington State, Part 1: A Synthesis of Science. Publication No. 05-06-006. Washington State Department of Ecology. Ecology. 2016. Determining the Ordinary High Water Mark for Shoreline Management Act Compliance in Washington State. Washington State Department of Ecology. October. FEMA. Flood Map Service Center. Federal Emergency Management Agency. Accessed March 6, 2020. Available online at: https://msc.fema.gov/portal/home. Gretag-Macbeth Corporation. 1994. Munsell Soil Color Charts. New York, NY. Hru by, T. 2014. Washington State Wetland Rating System for Western Washington: 2014 Update. (Publication No. 14-06-029). Olympia, Washington: Washington State Department of Ecology. Lichvar, R.W., M. Butterwick, N.C. Melvin, and W.N. Kirchner. 2014. The National Wetland Plant List: 2014 Update of Wetland Ratings. Phytoneuron. 41:1-42. April 2. NWCB. 2018. Washington State Noxious Weed Control Board. Available online at: http://www.nwcb.wa.gov/default.asp. USACE. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1. U.S. Army Corps of Engineers Waterways Experiment Station. January. USACE. 2010. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region. Publication No. ERDC/EL TR-10-3. Version 2.0 Research and Development Center Environmental Laboratory, U.S. Army Corps of Engineers. May. Available online at: http://www.usace.army.mil/Portals/2/docs/civilworks/regulatory/reg_supp/west_mt_finalsupp2. pdf. USDA NRCS. 1983. Soil Survey Report of Snohomish County Area, Washington. US Department of Agriculture National Resources Conservation Service. July. USDA NRCS. National Hydric Soils List. U.S. Department of Agriculture, Natural Resources Conservation Service. Accessed March 6, 2020. Available online at: https://www.nres.usda.gov/Internet/FSE_DOCUMENTS/nreseprdl316620.html. USDA NRCS. Soil Survey Geographic Database. U.S. Department of Agriculture, Natural Resources Conservation Service. Available online at: https://data.nal.usda.gov/dataset/soil-survey- geographics-database-ssurgo. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 9-1 May 7, 2021 Attachment 7 Landau Associates USDA NRCS. Web Soil Survey. U.S. Department of Agriculture, Natural Resources Conservation Service. Available online at: https://websoilsurvey.nres.usda.gov/app/WebSoilSurvey.aspx. USFWS. National Wetlands Inventory, Wetlands Mapper. (Maps for 1981 to 2020). U.S. Fish & Wildlife Service. Available online at: https://www.fws.gov/wetlands/data/Mapper.html. USGS. Topographic Map. U.S. Geological Survey. Available online at: https://ngmdb.usgs.gov/topoview/viewer/. WDFW NWIFC. Statewide Integrated Fish Distribution Web Map. Washington Department of Fish & Wildlife, Northwest Indian Fisheries Commission. Available online at: https://geo.nwifc.org/swifd/. Wetland Critical Areas Report 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project 9-2 May 7, 2021 Attachment 7 Puget Sound Project Location J� �Mill_ city"' 91MOF Park a moodway N 0 0.5 1 0 0 o' Miles 0 N a 0 0 Data Source: Esri 2012 Edmonds WWTP 14 LANDAU Carbon Recovery Project ASSOCIATES Edmonds, Washington Attachment 7 to I Esperance Seattle Spokane Tacoma 1lympia Washington Vicinity Map `-, Figure 1 Legend of Q Project Area g Q Study Area LANDAU ASSOCIATES Dayton Avenue O N N Note 1. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. 0 100 200 Sources: BHC Consultants, 2020; King County Imagery Scale in Feet Edmonds WWTP Figure Carbon Recovery Project Study Area Map Edmonds, Washington Attachment 7 u:\rr Legend Q Project Area Q Study Area • Sample Point LANDAU 14 ASSOCIATES CC + O r-I N 4 A- 2 -11 00 r . am SP-2 • A-7 A-3 • • A_6 : 4 A-1 _ A-13 A-8 • • A-2+ • • A-5 •SP-1 •A-10 9 Wetland A Wetland continues to the south and east Wetland Wetland Buffer (110 ft) 0 60 120 Scale in Feet Data Source: King County Imagery Edmonds WWTP Carbon Recovery Project Edmonds, Washington Note 1. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. Figure Wetland Location Map 3 Attachment 7 Clearing Limits (Temporary Impacts) Temporary Construction Access Platform Top of Platform to Match Bottom of Temporary Wall Opening Which will be Closed up with Removable Panels after Construction. Overall Platform Dimensions During Construction 12'W x 25'D. After Construction Leave in Place a 12'W x 12'D Portion to be Permanently Installed. .r Temporary Buffer Impact = 1095 sf 12'W x 12'D Loading Dock (Proposed) (Permanently Installed) � � Property Line Carbon Filter (Proposed) f 10 FAN MCC r kDOM PLC J GYA1 MCC J � _ SCLfBS HANOLfNO ROplr soups \ _ PROCESS r� BBILOWB i ' Loading Dock (Permanent and r. Temporary Section = 300 sf) I � n Wall Opening (Proposed) Wall Opening Shrub Trimming within 5ft of building, (Proposed) but no clearing on south side of building f r �r j A-12 A-11 • • EWRNCEf OFFICE ---» -ilk 0 P-2 I C A-3 A-7 • x I • E N I a A-4 ? a 1 A-6 • A-1 • 5 A-2 • E w I A-13 • A-8 Wetland A SP-1 • m 1 • A-9 • — v A-10 • • Wetland continues to the south and east oLegend Note % o Clearing Limits • Wetland Point 1. Black and white reproduction of this colt Wetland Buffer (55 ft) original may reduce its effectiveness and Permanent Buffer Impact Wetland Line (50% of Standard Buffer) lead to incorrect interpretation. Temporary Buffer Impact Wetland Buffer (110 ft) Wetland Buffer (27.5 ft) 0 30 60 0 (25% of Standard Buffer) 2 Sources: BHC Consultants, 2020; King County Imagery Scale in Feet 0 d Edmonds WWTP Figure LANDAU Carbon Recovery Project Wetland Buffer Impact Map /� 4 ASSOCIATES Edmonds, Washington Attachment 7 ;I. Clearing Limits (Temporary Impacts) \ N Temporary Construction Access Platform Top of Platform to Match Bottom of Temporary Wall Opening Which will be Closed up with Removable Panels after Construction. Overall Platform Dimensions During Construction 12'W x 25'D. After Construction Leave in Place a 12'W x 12'D Portion to be Permanently Installed. Loading Dock (Temporary Section) ■ Property Line fi FD Carbon Filter (Proposed) I I rD FAN Mcc I T RQOM SOLIDS HANDLING rl ROOM Loading Dock �— (Permanent Section) I PLC IGYM -x. MCC i HYPOCHLORITE -� STORAGE - II SOLIDS QA PROCESS 04JILONG --------------- If I 1 �I uco.�iw an:iw.c POLYMER FEED r SOLIDS CSAL ROOM e Ir OFFICE STORAGE Wall Opening �J (Proposed) Wall Opening Shrub Trimming within 5ft of building, (Proposed) but no clearing on south side of building a: Downed trees from clearing limits to be Zplaced in this vicinity as downed large wood f �♦ l Wetland A Wetland continues to the south and east Legend Note Clearing Limits Grass Seed Mix Enhancement Area (460 sf) 1. Black and white reproduction of this color original may reduce its effectiveness and — Wetland Line Tree /Shrub /Ground Cover Enhancement Area (795 sf) lead to incorrect interpretation. — — Wetland Buffer (110 ft) %I 0 30 60 LANDAU Scale in Feet ASSOCIATES ToPOF ROMALLTO8E FLUSH WFrH ORSLIGHTLY ABOVE FINISHED GRADE — SET SHRUB VTRAN3H7 AND PLAC£ ROOTSALL O N SOL ID GRO LIND O R ON CON PACTED R4CKF ILL SEE SPECIFICATIONS FOR INSCRUCT1ONS ON PLANTINSFALL4TION. EXTRA GOIL SHALL BE LOCATED PER THE 0IRECT10N OF THE SIOLOGI87OR ENGINEER. F IN ISHEO G RAI) E r SCARIFYSIDESOF ROOTBALL PLACES'OF BARK MULCH IN SAUCERTO VATHIN:P OG THE - TRUNK. ALL CONTAINER PLANTS EE RECEIVEA24'DIA RFOR R j ` �- �`EX$3TING NATIVE &DIL OR RESTORATION PLANTING ONLY I .... - j N EtAlY COM PAGTEO TO PSOIL PLA WING P T - 3 TIMES ROOTEALL DIAMETER f'l'�CONTAINER PLANTING DETAIL W-7 , SCALE: NTS TYPICAL ON -CENTER PLANTING GR1D— ❑ F FSET PLANTS TO AVOID STRAIGHT RC P DOM PLANTING DETAIL SCALE' NTS CL (IMP AND SCATTER PLANTS SO THATAVERAGE PLANTING OENSRY IS EQ UIVA LE NT To GRI D SPACING MLY MDC PLANT S PECIES Enhancement Plantings TOTAL AREA = 1,255 sq ft) Scientific Name ICommon Name I#of Plants IStock Size (Spacing (C.C.) Trees Pinuscontorta Shore pine 1 4 6ftmin height 14ft Shrubs Acercircinatum Vine maple 4 8ftmin height 6ft Rhododendron macrophyllum Pacific rhododendron 4 1.5 ft min height 6 ft Ribes sanguineum Flowering currant 5 1.5 ft min height 6 ft Gaulthoria shallon Salal 5 1.5 ft min height 6 ft Groundcovers Refer to Grass Seed Mix Table Grass Seed Mix isee Grass Seed Mix N/A 460 sq ft Notes: Grass seed mix is limited to area within 6 ft of the SR 104 sidewalk and area of temporary loading dock; no trees orshurbs shall be placed within 6ft from the edge of pavement. Grass Seed Mix Scientific Name Festuca rubra ICommon Name Red fescue I Percent by weight 30 I Application 1201bs/acre Elym us glaucus Blue wildrye 30 Bromus corinatus California brome 30 Festuca idahoensis Idaho fescue 10 Downed Tree Placement Notes 1. Retain segments of tree trunks from 4 to 6 feet in length or longer from trees to be removed. 2. Branches may be trimmed and placed on downed trees as habitat piles. 3. Habitat piles shall be layered with larger material at/near base. 4. Avoid damage to adjacent vegetation when placing downed trees. Sources: BHC Consultants, 2020; King C unty Imager Edmonds WWTP Figure Carbon Recovery Project Enhancement Plan Edmonds, Washington Attachment 7 Page 1 of 1 Table 1 Methods for Wetland Determination WWTP Carbon Recovery Project Edmonds, Washington Parameter Definition Field Indicators Field Assessment 1. Dominance: The dominant plants and their wetland indicator status are evaluated quantitatively within data plots and visually throughout the study area. If the test for Wetland vegetation is adapted to saturated soil conditions. The US Army Corps of Engineers dominance fails, and indicators of wetland soils and hydrology are present, the (USAGE) has assigned a wetland indicator to each plant species that denotes its frequency of Prevalence Index is calculated. occurrence within wetlands (Lichvar et al. 2014). These are: More than 50 percent of the dominant plants totaled from all vegetation • Obligate (OBL) wetland plants almost always (more than 99 percent of the time) occur strata are hydrophytic (i.e., species with indicators of OBL, FACW, or FAC in wetlands under natural conditions. [regardless of modifier]). 2. Prevalence Index: A weighted average of the percent cover of each indicator status is calculated. (See data sheets in Appendix D.) An index of 3 or less satisfies the • Facultative wetland (FACW) plants usually (67 to 99 percent of the time) occur in hydrophytic vegetation criteria. If the Prevalence Index is not met, then consideration is wetlands but are occasionally found in non -wetlands. or given to morphological adaptations and/or non -vascular plants. Wetland Vegetation • Facultative (FAC) plants are equally likely to occur in wetlands and non -wetlands (34 to A plant community has a visually estimated cover percentage of OBL and a 66 percent of the time). FACW species that exceeds the coverage of FACU and UPL species. If 3. Morphological Adaptations/Non-Vascular Plants: Some plants develop recognizable • Facultative upland (FACU) plants usually occur in non -wetlands but are occasionally dominance is not met, the Prevalence Index is calculated, or consideration is morphological adaptations when they occur in wetland areas. These features must be found in wetlands (1 to 33 percent of the time). given to morphological adaptations and/or non -vascular plants observed. observed on >50 percent of the individuals of an FACU species living in an area where • Obligate upland (UPL) plants almost always (more than 99 percent of the time) occur in indicators of hydric soils and wetland hydrology are present. Wetland non -vascular uplands. plants can include bryophytes (mosses, liverworts, and hormworts). The cover of wetland bryophytes must be >50 percent of the total bryophyte cover in a plot in coastal Washington, forested wetlands. A shovel is used to dig holes at least 20 inches below ground surface (bgs) at multiple Hydric soils have an identifiable color pattern, which occurs if the soil is locations in the study area. Direct observation of the soil is made at multiple locations in Soils are classified as hydric, or they possess characteristics that are associated with saturated, flooded, or ponded for a long period of time. Faint or washed-out wetlands and uplands, as applicable. Soil organic content is determined visually and Wetland SoilSIaI reducing soil conditions. A hydric soil is formed under conditions of saturation, flooding, or colors typically form in the soil, and mottles of bright color, such as rust texturally, and soil color is determined using the Munsell soil color chart (Gretag-Macbeth ponding, and during the growing season, anaerobic conditions develop in the upper part of (known as redoxymorphic features), form. Accumulations of organic matter 1994). Depth to water saturation and/or inundation is also observed. The characteristics the soil. at the surface, a sulfurous odor, and organic matter stains also may be observed are compared to the hydric soil indicators for "all soils," "sandy soils," and present. "loamy clayey soils," as described in the USACE Regional Supplement (USACE 2010). The area is inundated either permanently or periodically at mean water depths less than or Primary indicators of wetland hydrology include surface inundation (standing During investigation of soils, soil pits are allowed to stand for up to 20 minutes to allow equal to 6.6 feet. water), saturated soils, water marks, drift lines, sediment deposits, and groundwater to percolate into the pit to determine groundwater level in the soil profile. Wetland Hydrologylbj or drainage patterns. Secondary indicators include water -stained leaves, During the dry season, the pit may be extended to 24 inches bgs to investigate oxidized root channels, or local soil survey data for identified soils. In the groundwater levels. In addition, the extent of soil saturation and the presence/absence of The soil is inundated or saturated to the surface for at least 14 consecutive days during the absence of primary indicators, at least two secondary indicators are required oxidation are determined in the soils removed. Other indicators of wetland hydrology are growing season.(`) to meet the wetland hydrology criteria. observed at ground surface. Notes: (a) USACE 1987, 2010. USDA NRCS 2012. (b) USACE 1987, 2010. (0 The growing season is the time during which two or more non -evergreen, vascular plant species growing in a wetland or surrounding area exhibit biological activity, such as new growth. The growing season also can be determined by soil temperature. The growing season identified on the WETS table for the project area is February 28 to November 22 (see Appendix C). 5/6/21 \\edmdata01\projects\074\209.010\R\CritAreas\Table 1_complete.docx Landau Associates Attachment 7 APPENDIX A Background Information Review Figures Attachment 7 4b !' 4V ke 2 do 4 NJ lqw n * 1 L.,....�" N O N N � r At AF X Q �Z N r # AA Note Legend 1. Black and white reproduction of this color o Q Project Area original may reduce its effectiveness and lead to incorrect interpretation. o Q Study Area 0 300 600 N_ Now n O vl Sources: BHC Consultants, 2020; USGS; King County Imagery Scale in Feet 0 "I Edmonds WWTP I Figure LLANDAU Carbon Recovery Project USGS Topographic Map /� ASSOCIATES Edmonds, Washington _ Attachment 7 4 I. z Le end Note a 1. Black and white reproduction of this color Estuarine and Marine Deepwater Q Project Area original may reduce its effectiveness and 0 0 Estuarine and Marine Wetland Q Study Area lead to incorrect interpretation. 0 o Freshwater Emergent Wetland 0 300 600 �I Freshwater Forested/Shrub Wetland 0 Riverine Scale in Feet 2 Sources: BHC Consultants, 2020; King County Imagery d Edmonds WWTP Figure LANDAU Carbon Recovery Project NWI Map /� ASSOCIATES Edmonds, Washington A— 2 Attachment 7 LL Soil Series of Q Project Area o Q Study Area N v' Note 1. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. 0 300 600 0 v Scale in Feet 2 Sources: BHC Consultants, 2020; King County Imagery d Edmonds WWTP Figure LANDAU Carbon Recovery Project Soil Series Map /� ASSOCIATES Edmonds, Washington A- 3 Soil Series 5 Alderwood-Urban Land Complex, 2 to 8 percents I opes 17 Everett Very Gravelly Sandy Loam, O to 8 percent slopes 27 Kitsap Silt Loam, 0 to 8 percent slopes 34 Mukilteo Muck 78 Urban Land Attachment 7 0 0 a } r `r1 • A. � r ■ l �� t . i • 1.AL 73 1 1I+jam=w' DayjoQ Avenue Aw moo 1 w. Legend Note 0 FEMA 100-Year Flood (Zone AE) 1. Black and white reproduction of this color original may reduce its effectiveness and Q Project Area lead to incorrect interpretation. 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Snowfall Temp precip less than 10 or more than Jan 45.8 33.5 39.7 4.35 3.06 5.17 11 1.2 Feb 49.3 34.8 42.1 3.40 2.38 4.04 10 0.5 Mar 53.3 37.4 45.3 3.84 2.93 4.46 11 0.0 Apr 58.3 41.1 49.7 2.96 2.36 3.39 9 0.0 May 63.9 46.3 55.1 2.57 1.93 3.01 7 0.0 Jun 68.4 51.1 59.8 2.25 1.47 2.70 6 0.0 Jul 73.1 54.2 63.7 1.30 0.62 1.58 3 0.0 Aug 74.0 54.0 64.0 1.35 0.58 1.64 3 0.0 Sep 68.8 48.8 58.8 2.09 1.16 2.55 5 0.0 Oct 59.7 42.5 51.1 3.34 1.86 4.07 9 0.0 Nov 50.6 37.7 44.2 5.15 3.70 6.08 12 0.2 Dec 45.2 34.0 39.6 4.96 3.70 5.81 12 0.4 Annual: 34.71 40.36 Average 59.2 42.9 51.1 - - - - - Total - - - 37.56 99 2.3 GROWING SEASON DATES Years with missing data: 24 deg = 28 deg = 32 deg = 6 3 2 Years with no occurrence: 24 deg = 28 deg = 32 deg = 0 0 0 Data years used: 24 deg = 28 deg = 32 deg = 24 27 28 Probability 24 F or 28 For 32 F or higher higher higher 50 percent * 2/2 to 12/ 2/28 to 4/7 to 17: 318 11 /22: 10/25: days 267 days 201 days 70 percent * 1 /25 to 2/21 to 4/1 to 12/25: 11/30: 11/1:214 334 days 282 days days * Percent chance of the growing season occurring between the Beginning and Ending dates. STATS TABLE - total precipitation (inches) Yr Jan Feb Mar Apr May Jun 1894 1895 4.48 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 Attachment 7 Jul Aug Sep Oct Nov Dec Annl 3. 4. 5.45 4.05 17. 65 02 17 4.48 2013 6.22 M2.40 3.67 3.94 M2.31 2.02 M0.04 M1.77 M3. 1. M3. M2. 33. 78 43 46 31 35 2014 M4.08 M5.04 7.29 3.77 3.06 1.81 M1.18 M1.59 M3. 6. 5.54 6.08 49. 52 29 25 2015 7.15 5.40 3.37 2.43 0.52 0.62 0.32 2.11 2. 3. 6.60 8.82 43. 49 63 46 2016 M6.89 M3.26 6.11 M2.23 M1.31 1.87 M0.55 M0.09 2. 7. 8.33 M3. 44. 80 36 23 03 2017 M2.29 5.76 7.01 4.02 4.19 M0.93 0.00 0.13 M1. M3. 8.20 M3. 40. 11 43 89 96 2018 M6.45 5.12 M4.97 M5.56 0.61 M2.61 M0.02 0.41 3. 3. 4.94 4.54 42. 61 37 21 2019 2.24 3.05 M1.98 M4.03 2.00 M1.23 M0.90 M0.71 M3. 3. M2. M5. 31. 97 29 59 18 17 2020 5.82 7.12 M2.16 M1.89 4.16 4.53 0.72 1.09 2. 3. 5.42 5.64 44. 73 55 83 2021 M5.53 5.09 2.78 M1.09 14. 49 Notes: Data missing in any month have an " M' flag. A "T" indicates a trace of precipitation. Data missing for all days in a month or year is blank. Creation date: 2016-07-22 Attachment 7 Edmonds WWTP Chapter 19 Hydrology Tools for Wetland Determination Figure 19-7 Rainfall documentation worksheet Date: 2/27/21 Weather station: County: Snohomish Soil name: Photo date: 1st prior month* 2nd prior month* 3rd prior month* Conclusions: Rainfall Documentation (use with photographs) Landowner: State: WA Part 650 Engineering Field Handbook Growingseason: 2/28-11/22 Long-term rainfall records Tract no.: Month 3yrs. in 10less than Normal 3yrs. in 10 more than Rain fall Condition dry, wet, normal Condition value Month weight value Product of previous two columns 1 3.06 4.3 E 5.17 5 . 513 W 3 3 9 12 3.70 4.96 5.81 .64 N 2 2 4 11 3.70 5.15 6.08 5.4 jN 1 2 1 1 1 2 * Compared to photo date Note: If sum is Condition value: 6-9 then prior period has been Dry =1 drier than normal Normal =2 10 -14 then prior period has been Wet =3 normal 15 -18 then prior period has been wetter than normal Wetter than normal. Sum 15 19 26 (210�ffic i,AL1ffil$9Zl} 7 APPENDIX D Wetland Determination Data Forms Attachment 7 WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys, and Coast Region Project/Site: Edmonds WWTP City/County: Edmonds/Snohomish Sampling Date: 2/27/21 Applicant/Owner: City of Edmonds State: WA Sampling Point: SP-1 Investigator(s): SJQ Section, Township, Range: Landform (hillslope, terrace, etc.): Terrace Local relief (concave, convex, none): concave Slope (%): Subregion (LRR): A — Northwest Forests and Coast Lat: Long: Datum: Soil Map Unit Name: Mukilteo Muck NWI classification: Upland Are climatic / hydrologic conditions on the site typical for this time of year? Yes No X (If no, explain in Remarks.) Are Vegetation N Soil N or Hydrology N significantly disturbed? Are "Normal Circumstances" present? Yes X No Are Vegetation N Soil N or Hydrology N naturally problematic? (If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS — Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? Yes X No Hydric Soil Present? Yes X No Is the Sampled Area Wetland Hydrology Present? Yes X No within a Wetland? Yes X No Remarks: Conditions are wetter than normal. VEGETATION — Use scientific names of plants. Absolute Dominant Indicator Dominance Test worksheet: Tree Stratum (Plot size: 30 ft ) % Cover Species? Status Number of Dominant Species 1. Alnus rubra 80 Y FAC That Are OBL, FACW, or FAC: 3 (A) Total Number of Dominant 2 3. Species Across All Strata: 3 (B) 4. Percent of Dominant Species That Are OBL, FACW, or FAC: 100 (A/B) Sapling/Shrub Stratum (Plot size: 5 ft ) = Total Cover Prevalence Index worksheet: 1. Rubus armeniacus 50 Y FAC Total %Cover of: Multiply by: 2. OBL species x 1 = 3. FACW species x 2 = 4. 5. FAC species x 3 = FACU species x 4 = = Total Cover Herb Stratum (Plot size: 5 ft ) UPL species x 5 = 1. Oenanthe sarmentosa 1 Y OBL Column Totals: (A) (B) 2 Prevalence Index = B/A = 3. Hydrophytic Vegetation Indicators: 4. _ 1 - Rapid Test for Hydrophytic Vegetation 5. X 2 - Dominance Test is >50% 6. _ 3 - Prevalence Index is :53.0' 7. _ 4 - Morphological Adaptations' (Provide supporting g data in Remarks or on a separate sheet) g _ 5 - Wetland Non -Vascular Plants' _ Problematic Hydrophytic Vegetation' (Explain) 10. 11. 'Indicators of hydric soil and wetland hydrology must = Total Cover be present, unless disturbed or problematic. Woody Vine Stratum (Plot size: 5 ft ) 1. 0 Hydrophytic 2. Vegetation Present? Yes X No = Total Cover % Bare Ground in Herb Stratum 0 Remarks: US Army Corps of Engineers Attachment 7 Western Mountains, Valleys, and Coast — Version 2.0 SOIL Sampling Point: SP-1 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type' Loc2 Texture Remarks 0-1 O laver 1-12+ 5PB 4/1 Loamy sand 'Type: C=Concentration, D=De letion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3: Histosol (Al) _ Sandy Redox (S5) _ 2 cm Muck (Al 0) Histic Epipedon (A2) _ Stripped Matrix (S6) _ Red Parent Material (TF2) Black Histic (A3) _ Loamy Mucky Mineral (F1) (except MLRA 1) _ Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) X Loamy Gleyed Matrix (F2) _ Other (Explain in Remarks) Depleted Below Dark Surface (Al 1) _ Depleted Matrix (F3) Thick Dark Surface (Al2) _ Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) _ Depleted Dark Surface (F7) wetland hydrology must be present, _ Sandy Gleyed Matrix (S4) _ Redox Depressions (F8) unless disturbed or problematic. Restrictive Layer (if present): Type: Depth (inches): Hydric Soil Present? Yes X No Remarks: Too wet to dig beyond 12". HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required) X Surface Water (Al) _ Water -Stained Leaves (139) (except _ Water -Stained Leaves (139) (MLRA 1, 2, X High Water Table (A2) MLRA 1, 2, 4A, and 413) 4A, and 413) X Saturation (A3) _ Salt Crust (B11) _ Drainage Patterns (1310) X Water Marks (B1) _ Aquatic Invertebrates (1313) _ Dry -Season Water Table (C2) Sediment Deposits (62) _ Hydrogen Sulfide Odor (Cl) _ Saturation Visible on Aerial Imagery (C9) Drift Deposits (133) _ Oxidized Rhizospheres along Living Roots (C3) _ Geomorphic Position (D2) Algal Mat or Crust (134) _ Presence of Reduced Iron (C4) _ Shallow Aquitard (D3) Iron Deposits (135) _ Recent Iron Reduction in Tilled Soils (C6) _ FAC-Neutral Test (D5) Surface Soil Cracks (66) _ Stunted or Stressed Plants (D1) (LRR A) _ Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) _ Other (Explain in Remarks) _ Frost -Heave Hummocks (D7) Sparsely Vegetated Concave Surface (138) Field Observations: Surface Water Present? Yes X No Depth (inches): 3 Water Table Present? Yes X No Depth (inches): 0 Saturation Present? Yes X No Depth (inches): 0 Wetland Hydrology Present? Yes X No includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: US Army Corps of Engineers Attachment 7 Western Mountains, Valleys, and Coast — Version 2.0 WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys, and Coast Region Project/Site: Edmonds WWTP City/County: Edmonds/Snohomish Sampling Date: 2/27/21 Applicant/Owner: City of Edmonds State: WA Sampling Point: SP-2 Investigator(s): SJQ Section, Township, Range: Landform (hillslope, terrace, etc.): Terrace Local relief (concave, convex, none): concave Slope (%): Subregion (LRR): A — Northwest Forests and Coast Lat: Long: Datum: Soil Map Unit Name: Urban Land NWI classification: Upland Are climatic / hydrologic conditions on the site typical for this time of year? Yes No X (If no, explain in Remarks.) Are Vegetation Y Soil N or Hydrology N significantly disturbed? Are "Normal Circumstances" present? Yes X No Are Vegetation N Soil N or Hydrology N naturally problematic? (If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS — Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? Yes No X Hydric Soil Present? Yes No X Is the Sampled Area Wetland Hydrology Present? Yes No X within a Wetland? Yes No X Remarks: Conditions are wetter than normal. Vegetation in the area is maintained adjacent to public pathway. VEGETATION — Use scientific names of plants. Absolute Dominant Indicator Dominance Test worksheet: Tree Stratum (Plot size: 30 ft ) % Cover Species? Status Number of Dominant Species 1. Alnus rubra 80 Y FAC That Are OBL, FACW, or FAC: 1 (A) Total Number of Dominant 2 3. Species Across All Strata: 2 (B) 4. Percent of Dominant Species That Are OBL, FACW, or FAC: 50 (A/B) = Total Cover Sapling/Shrub Stratum (Plot size: 5 ft ) Prevalence Index worksheet: 1. Oemleria cerasiformis 20 Y FACU Total %Cover of: Multiply by: 2. 3. OBL species x 1 = 4. FACW species x 2 = FAC species 80 x 3 = 240 5. = Total Cover FACU species 20 x 4 = 80 Herb Stratum (Plot size: 5 ft ) UPL species x 5 = 1. 0 Column Totals: 100 (A) 320 (B) 2 Prevalence Index = B/A = 3.2 3. Hydrophytic Vegetation Indicators: 4. _ 1 - Rapid Test for Hydrophytic Vegetation 5. _ 2 - Dominance Test is >50% 6. _ 3 - Prevalence Index is :53.0' 7. _ 4 - Morphological Adaptations' (Provide supporting data in Remarks or on a separate sheet) _ 5 - Wetland Non -Vascular Plants' _ Problematic Hydrophytic Vegetation' (Explain) g g 10. 11. 'Indicators of hydric soil and wetland hydrology must = Total Cover be present, unless disturbed or problematic. Woody Vine Stratum (Plot size: 5 ft ) 1. 0 Hydrophytic 2. Vegetation Present? Yes No X = Total Cover % Bare Ground in Herb Stratum 0 Remarks: US Army Corps of Engineers Attachment 7 Western Mountains, Valleys, and Coast — Version 2.0 SOIL Sampling Point: SP-2 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type' Loc2 Texture Remarks 0-12 10YR 4/3 Loam 12+ Refusal Gravel 'Type: C=Concentration, D=De letion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3: Histosol (Al) _ Sandy Redox (S5) _ 2 cm Muck (A10) Histic Epipedon (A2) _ Stripped Matrix (S6) _ Red Parent Material (TF2) Black Histic (A3) _ Loamy Mucky Mineral (F1) (except MLRA 1) _ Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) _ Loamy Gleyed Matrix (F2) _ Other (Explain in Remarks) Depleted Below Dark Surface (Al 1) _ Depleted Matrix (F3) Thick Dark Surface (Al2) _ Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) _ Depleted Dark Surface (F7) wetland hydrology must be present, _ Sandy Gleyed Matrix (S4) _ Redox Depressions (F8) unless disturbed or problematic. Restrictive Layer (if present): Type: Depth (inches): Hydric Soil Present? Yes No X Remarks: HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required) Surface Water (Al) _ Water -Stained Leaves (139) (except _ Water -Stained Leaves (69) (MLRA 1, 2, High Water Table (A2) MLRA 1, 2, 4A, and 413) 4A, and 413) Saturation (A3) _ Salt Crust (B11) _ Drainage Patterns (1310) Water Marks (61) _ Aquatic Invertebrates (1313) _ Dry -Season Water Table (C2) Sediment Deposits (62) _ Hydrogen Sulfide Odor (Cl) _ Saturation Visible on Aerial Imagery (C9) Drift Deposits (133) _ Oxidized Rhizospheres along Living Roots (C3) _ Geomorphic Position (D2) Algal Mat or Crust (64) _ Presence of Reduced Iron (C4) _ Shallow Aquitard (D3) Iron Deposits (135) _ Recent Iron Reduction in Tilled Soils (C6) _ FAC-Neutral Test (D5) Surface Soil Cracks (66) _ Stunted or Stressed Plants (D1) (LRR A) _ Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (137) _ Other (Explain in Remarks) _ Frost -Heave Hummocks (D7) Sparsely Vegetated Concave Surface (138) Field Observations: Surface Water Present? Yes No X Depth (inches): Water Table Present? Yes No X Depth (inches): Saturation Present? Yes No X Depth (inches): Wetland Hydrology Present? Yes No X includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: US Army Corps of Engineers Attachment 7 Western Mountains, Valleys, and Coast — Version 2.0 APPENDIX E Selected Site Photographs Attachment 7 S/b/Ll t-1.000X 1. Wetland A facing north from SR 104 2. Sample point SP-2 facing east Edmonds WWTP Figure Carbon Recovery Project Selected Site Photographs LANDAU Edmonds, Washington �_� ASSDCIATES Attachment 7 APPENDIX F Wetland Rating Forms and Figures Attachment 7 Wetland name or number Vet I and A RATING SUMMARY - Western Washington Name of wetland (or ID #) Rated by Si Q Date of site visit: 2/ 27/ 21 Trained by Ecology? X Yes No Date of training 3/ 2008 HGM Class used for rating Depr essi oval Wetland has multiple HGM classes? X Y N NOTE: Form is not complete without the figures requested (figures can be combined). Source of base aerial photo/map ESRI Mr I d I Trager y Vet I and A OVERALL WETLAND CATEGORY (based on functions_ or special characteristics_) 1. Category of wetland based on FUNCTIONS X Category I —Total score = 23 - 27 Category II — Total score = 20 - 22 Category III — Total score = 16 - 19 Category IV — Total score = 9 - 15 FUNCTION Improving Water Quality Hydrologic Habitat Circle the appropriate ratings Site Potential H M L H (D L H M L Landscape Potential H MO L H M L H M OL Value (ED M L H M L H M L TOTAL Score Based on Ratings 8 8 7 23 2. Category based on SPECIAL CHARACTERISTICS of wetland CHARACTERISTIC CATEGORY Estuarine I II Wetland of High Conservation Value I Bog I Mature Forest I Old Growth Forest I Coastal Lagoon I II Interdunal I II III IV None of the above X Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Score for each function based on three ratings (order of ratings is not important) 9 = H,H,H 8 = H, H, M 7 = H,H,L 7 = H,M,M 6 = H,M,L 6 = M,M,M 5 = H,L,L 5 = M,M,L 4 = M,L,L 3 = L,L,L 1 Attachment 7 Wetland name or number A Maps and figures required to answer questions correctly for Western Washington Depressional Wetlands Map of: To answer questions: Figure # Cowardin plant classes D 1.3, H 1.1, H 1.4 F- 1 Hydroperiods D 1.4, H 1.2 F- 2 Location of outlet (can be added to map of hydroperiods) D 1.1, D 4.1 F- 2 Boundary of area within 150 ft of the wetland (can be added to another figure) D 2.2, D 5.2 ' Map of the contributing basin D 4.3, D 5.3 - 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 F- 4 Screen capture of map of 303(d) listed waters in basin (from Ecology website) D 3.1, D 3.2 - Screen capture of list of TMDLs for WRIA in which unit is found (from web) D 3.3 - Riverine Wetlands Map of: To answer questions: Figure # Cowardin plant classes H 1.1, H 1.4 Hydroperiods H 1.2 Ponded depressions R 1.1 Boundary of area within 150 ft of the wetland (can be added to another figure) R 2.4 Plant cover of trees, shrubs, and herbaceous plants R 1.2, R 4.2 Width of unit vs. width of stream (can be added to another figure) R 4.1 Map of the contributing basin R 2.2, R 2.3, R 5.2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) R 3.1 Screen capture of list of TMDLs for WRIA in which unit is found (from web) R 3.2, R 3.3 Lake Fringe Wetlands Map of: To answer questions: Figure # Cowardin plant classes L 1.1, L 4.1, H 1.1, H 1.4 Plant cover of trees, shrubs, and herbaceous plants L 1.2 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) L 2.2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) L 3.1, L 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) L 3.3 Slope Wetlands Map of: To answer questions: Figure # Cowardin plant classes H 1.1, H 1.4 Hydroperiods H 1.2 Plant cover of dense trees, shrubs, and herbaceous plants S 1.3 Plant cover of dense, rigid trees, shrubs, and herbaceous plants (can be added to figure above) S 4.1 Boundary of 150 ft buffer (can be added to another figure) S 2.1, S 5.1 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) S 3.1, S 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) S 3.3 Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Attachment 7 Wetland name or number A HGM Classification of Wetlands in Western Washington For questions 1-7, the criteria described must apply to the entire unit being rated. If the hydrologic criteria listed in each question do not apply to the entire unit being rated, you probably have a unit with multiple HGM classes. In this case, identify which hydrologic criteria in questions 1-7 apply, and go to Question 8. 1. Are the water levels in the entire unit usually controlled by tides except during floods? NO - go to 2 YES - the wetland class is Tidal Fringe - go to 1.1 1.1 Is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? NO - Saltwater Tidal Fringe (Estuarine) YES - Freshwater Tidal Fringe Ifyour wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saltwater Tidal Fringe it is an Estuarine wetland and is not scored. This method cannot be used to score functions for estuarine wetlands. 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. NO - go to D YES - The wetland class is Flats Ifyour wetland can be classified as a Flats wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet all of the following criteria? _The vegetated part of the wetland is on the shores of a body of permanent open water (without any plants on the surface at any time of the year) at least 20 ac (8 ha) in size; _At least 30% of the open water area is deeper than 6.6 ft (2 m). NO - go to 4 YES - The wetland class is Lake Fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? The wetland is on a slope (slope can be very gradual), The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks, ater leaves the wetland without being impounded. NO - go to 5 YES - The wetland class is Slope NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than 1 ft deep). 5. Does the entire wetland unit meet all of the following criteria? The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river, The overbank flooding occurs at least once every 2 years. Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Attachment 7 Wetland name or number A NO - go toD YES - The wetland class is Riverine e Riverine unit can contain depressions that are filled with water when the river is not flooding 6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at sometime during the year? This means that any outlet, if present, is higher than the interior of the wetland. NO - go to 7 YES - The wetland class is Depressiional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding? The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. NO - go to 8 YES - The wetland class is Depressional 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM classes. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a Depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within the wetland unit being scored. (VOTE: Use this table only if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. If the area of the HGM class listed in column 2 is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the total area. HGM classes within the wetland unit being rated HGM class to use in rating Slope + Riverine Riverine Slope + Depressional Depressional Slope + Lake Fringe Lake Fringe Depressional + Riverine along stream within boundary of depression Depressional Depressional + Lake Fringe Depressional Riverine + Lake Fringe Riverine Salt Water Tidal Fringe and any other class of freshwater wetland Treat as ESTUARINE Ifyou are still unable to determine which of the above criteria apply to your wetland, or ifyou have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. Wetland Rating System for Western WA: 2014 Update 4 Rating Form - Effective January 1, 2015 Attachment 7 Wetland name or number A DEPRESSIONAL AND FLATS WETLANDS Water Quality Functions - Indicators that the site functions to improve water quality D 1.0. Does the site have the potential to improve water quality? D 1.1. Characteristics of surface water outflows from the wetland: Wetland is a depression or flat depression (QUESTION 7 on key) with no surface water leaving it (no outlet). points = 3 Wetland has an intermittently flowing stream or ditch, OR highly constricted permanently flowing outlet. 2 points = 2 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 1 Wetland is a flat depression (QUESTION 7 on key), whose outlet is a permanently flowing ditch. points = 1 D 1.2. The soil 2 in below the surface (or duff laver) is true clay or true organic (use NRCS definitions). Yes = 4 No = 0 D 1.3. Characteristics and distribution of persistent plants (Emergent, Scrub -shrub, and/or Forested Cowardin classes): Wetland has persistent, ungrazed, plants > 95% of area points = 5 Wetland has persistent, ungrazed, plants > % of area points = 3 5 Wetland has persistent, ungrazed plants > 1/10 of area points = 1 Wetland has persistent, ungrazed plants <1/10 of area points = 0 D 1.4. Characteristics of seasonal ponding or inundation: This is the area that is ponded for at least 2 months. See description in manual. Area seasonally ponded is > % total area of wetland points = 4 2 Area seasonally ponded is > % total area of wetland points = 2 Area seasonally ponded is < % total area of wetland points = 0 Total for D 1 Add the points in the boxes above 13 Rating of Site Potential If score is: X12-16 = H 6-11 = M 0-5 = L Record the rating on the first page D 2.0. Does the landscape have the potential to support the water quality function of the site? D 2.1. Does the wetland unit receive stormwater discharges? Yes = 1 No = 0 1 D 2.2. Is > 10% of the area within 150 ft of the wetland in land uses that generate pollutants? Yes = 1 No = 0 1 D 2.3. Are there septic systems within 250 ft of the wetland? Yes = 1 No = 0 0 D 2.4. Are there other sources of pollutants coming into the wetland that are not listed in questions D 2.1-D 2.3? Source Yes = 1 No = 0 0 Total for D 2 Add the points in the boxes above 2 Rating of Landscape Potential If score is: 3 or 4 = H X 1 or 2 = M 0 = L Record the rating on the first page D 3.0. Is the water quality improvement provided by the site valuable to society? D 3.1. Does the wetland discharge directly (i.e., within 1 mi) to a stream, river, lake, or marine water that is on the 303(d) list? Yes = 1 No = 0 D 3.2. Is the wetland in a basin or sub -basin where an aquatic resource is on the 303(d) list? Yes = 1 No = 0 1 D 3.3. Has the site been identified in a watershed or local plan as important for maintaining water quality (answer YES if there is a TMDL for the basin in which the unit is found)? Yes = 2 No = 0 0 Total for D 3 Add the points in the boxes above 2 Rating of Value If score is: X 2-4 = H 1 = M 0 = L Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Record the rating on the first page Attachment 7 Wetland name or number A DEPRESSIONAL AND FLATS WETLANDS Hydrologic Functions - Indicators that the site functions to reduce flooding and stream degradation D 4.0. Does the site have the potential to reduce flooding and erosion? D 4.1. Characteristics of surface water outflows from the wetland: Wetland is a depression or flat depression with no surface water leaving it (no outlet) points = 4 Wetland has an intermittently flowing stream or ditch, OR highly constricted permanently flowing outletpoints = 2 2 Wetland is a flat depression (QUESTION 7 on key), whose outlet is a permanently flowing ditch points = 1 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 0 D 4.2. Depth of storage during wet periods: Estimate the height of ponding above the bottom of the outlet. For wetlands with no outlet, measure from the surface of permanent water or if dry, the deepest part. Marks of ponding are 3 ft or more above the surface or bottom of outlet points = 7 Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5 5 Marks are at least 0.5 ft to < 2 ft from surface or bottom of outlet points = 3 The wetland is a "headwater" wetland points = 3 Wetland is flat but has small depressions on the surface that trap water points = 1 Marks of ponding less than 0.5 ft (6 in) points = 0 D 4.3. Contribution of the wetland to storage in the watershed: Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area of the wetland unit itself. The area of the basin is less than 10 times the area of the unit points = 5 3 The area of the basin is 10 to 100 times the area of the unit points = 3 The area of the basin is more than 100 times the area of the unit points = 0 Entire wetland is in the Flats class points = 5 Total for D 4 Add the points in the boxes above Rating of Site Potential If score is: 12-16 = H X 6-11 = M 0-5 = L Record the rating on the first page D 5.0. Does the landscape have the potential to support hydrologic functions of the site? D 5.1. Does the wetland receive stormwater discharges? Yes = 1 No = 0 D 5.2. Is >10% of the area within 150 ft of the wetland in land uses that generate excess runoff? Yes = 1 No = 0 D 5.3. Is more than 25% of the contributing basin of the wetland covered with intensive human land uses (residential at >1 residence/ac, urban, commercial, agriculture, etc.)? Yes = 1 No = 0 Total for D 5 Add the points in the boxes above 3 Rating of Landscape Potential If score is: X3 = H 1 or 2 = M 0 = L Record the rating on the first page D 6.0. Are the hydrologic functions provided by the site valuable to society? D 6.1. The unit is in a landscape that has flooding problems. Choose the description that best matches conditions around the wetland unit being rated. Do not add points. Choose the highest score if more than one condition is met. The wetland captures surface water that would otherwise flow down -gradient into areas where flooding has damaged human or natural resources (e.g., houses or salmon redds): • Flooding occurs in a sub -basin that is immediately down -gradient of unit. points = 2 2 • Surface flooding problems are in a sub -basin farther down -gradient. points = 1 Flooding from groundwater is an issue in the sub -basin. points = 1 The existing or potential outflow from the wetland is so constrained by human or natural conditions that the water stored by the wetland cannot reach areas that flood. Explain why points = 0 There are no problems with flooding downstream of the wetland. points = 0 D 6.2. Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan? 0 Yes=2 No=O Total for D 6 Add the points in the boxes above 2 Rating of Value If score is: X2-4 = H _1 = M _0 = L Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Record the rating on the first page 0 Attachment 7 Wetland name or number A These questions apply to wetlands of all HGM classes. HABITAT FUNCTIONS - Indicators that site functions to provide important habitat H 1.0. Does the site have the potential to provide habitat? H 1.1. Structure of plant community: Indicators are Cowardin classes and strata within the Forested class. Check the Cowardin plant classes in the wetland. Up to 10 patches may be combined for each class to meet the threshold of '4 ac or more than 10% of the unit if it is smaller than 2.5 ac. Add the number of structures checked. Aquatic bed 4 structures or more: points = 4 X Emergent 3 structures: points = 2 Scrub -shrub (areas where shrubs have > 30% cover) 2 structures: points = 1 X Forested (areas where trees have > 30% cover) 1 structure: points = 0 If the unit has a Forested class, check if: The Forested class has 3 out of 5 strata (canopy, sub -canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20% within the Forested polygon H 1.2. Hydroperiods Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover more than 10% of the wetland or % ac to count (see text for descriptions of hydroperiods). Permanently flooded or inundated 4 or more types present: points = 3 X Seasonally flooded or inundated 3 types present: points = 2 Occasionally flooded or inundated 2 types present: points = 1 2 XSaturated only 1 type present: points = 0 X Permanently flowing stream or river in, or adjacent to, the wetland Seasonally flowing stream in, or adjacent to, the wetland Lake Fringe wetland 2 points Freshwater tidal wetland 2 points H 1.3. Richness of plant species Count the number of plant species in the wetland that cover at least 10 ftz. Different patches of the same species can be combined to meet the size threshold and you do not have to name the species. Do not include Eurasian milfoil, reed canarygrass, purple loosestrife, Canadian thistle If you counted: > 19 species points = 2 5 - 19 species points = 1 < 5 species points = 0 H 1.4. Interspersion of habitats Decide from the diagrams below whether interspersion among Cowardin plants classes (described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats) is high, moderate, low, or none. If you have four or more plant classes or three classes and open water, the rating is always high. C) O O 2 None = 0 points Low = 1 point Moderate = 2 points All three diagrams 0 4 +* in this row t are HIGH = 3points Wetland Rating System for Western WA: 2014 Update 13 Rating Form - Effective January 1, 2015 Attachment 7 Wetland name or number A H 1.5. Special habitat features: Check the habitat features that are present in the wetland. The number of checks is the number of points. X Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long). Standing snags (dbh > 4 in) within the wetland Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends at least 3.3 ft (1 m) over a stream (or ditch) in, or contiguous with the wetland, for at least 33 ft (10 m) 2 Stable steep banks of fine material that might be used by beaver or muskrat for denning (> 30 degree slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered where wood is exposed) X At least % ac of thin -stemmed persistent plants or woody branches are present in areas that are permanently or seasonally inundated (structures for egg -laying by amphibians) Invasive plants cover less than 25% of the wetland area in every stratum of plants (see H 1.1 for list of strata) Total for H 1 Add the points in the boxes above $ Rating of Site Potential If score is:_15-18 = H X7-14 = M _0-6 = L Record the rating on the first page H 2.0. Does the landscape have the potential to support the habitat functions of the site? H 2.1. Accessible habitat (include only habitat that directly abuts wetland unit). Calculate: % undisturbed habitat 0 + [(% moderate and low intensity land uses)/2) 12 0 % If total accessible habitat is: > 1/3 (33.3%) of 1 km Polygon points = 3 0 20-33% of 1 km Polygon points = 2 10-19% of 1 km Polygon points = 1 < 10% of 1 km Polygon points = 0 H 2.2. Undisturbed habitat in 1 km Polygon around the wetland. 1 Calculate: % undisturbed habitat Q [(% moderate and low intensity land uses)/2) 12 = % Undisturbed habitat > 50% of Polygon points = 3 0 Undisturbed habitat 10-50% and in 1-3 patches points = 2 Undisturbed habitat 10-50% and > 3 patches points = 1 Undisturbed habitat < 10% of 1 km Polygon points = 0 H 2.3. Land use intensity in 1 km Polygon: If > 50% of 1 km Polygon is high intensity land use points = (- 2) -2 5 50% of 1 km Polygon is high intensity points = 0 Total for H 2 Add the points in the boxes above - 2 Rating of Landscape Potential If score is: 4-6 = H 1-3 = M X < 1= L Record the rating on the first page H 3.0. Is the habitat provided by the site valuable to society? H 3.1. Does the site provide habitat for species valued in laws, regulations, or policies? Choose only the highest score that applies to the wetland being rated. Site meets ANY of the following criteria: points = 2 — It has 3 or more priority habitats within 100 m (see next page) — It provides habitat for Threatened or Endangered species (any plant or animal on the state or federal lists) — It is mapped as a location for an individual WDFW priority species 2 — It is a Wetland of High Conservation Value as determined by the Department of Natural Resources X It has been categorized as an important habitat site in a local or regional comprehensive plan, in a Shoreline Master Plan, or in a watershed plan Site has 1 or 2 priority habitats (listed on next page) within 100 m points = 1 Site does not meet any of the criteria above points = 0 Rating of Value If score is: X 2 = H _1 = M _0 = L Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Record the rating on the first page 14 Attachment 7 Wetland name or number A WDFW Priority Habitats Priority habitats listed by WDFW (see complete descriptions of WDFW priority habitats, and the counties in which they can be found, in: Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species List. Olympia, Washington. 177 pp. http://wdfw.wa.gov/publications/00165/wdfw00165.pdf or access the list from here: http://wdfw.wa.gov/conservation/phs/list/) Count how many of the following priority habitats are within 330 ft (100 m) of the wetland unit: NOTE: This question is independent of the land use between the wetland unit and the priority habitat. Aspen Stands: Pure or mixed stands of aspen greater than 1 ac (0.4 ha). Biodiversity Areas and Corridors: Areas of habitat that are relatively important to various species of native fish and wildlife (full descriptions in WDFW PHS report). — Herbaceous Balds: Variable size patches of grass and (orbs on shallow soils over bedrock. Old-growth/Mature forests: Old -growth west of Cascade crest - Stands of at least 2 tree species, forming a multi - layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) > 32 in (81 cm) dbh or > 200 years of age. Mature forests - Stands with average diameters exceeding 21 in (53 cm) dbh; crown cover may be less than 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in old -growth; 80-200 years old west of the Cascade crest. Oregon White Oak: Woodland stands of pure oak or oak/conifer associations where canopy coverage of the oak component is important (full descriptions in WDFW PHS report p. 158 - see web link above). XRiparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems which mutually influence each other. — Westside Prairies: Herbaceous, non -forested plant communities that can either take the form of a dry prairie or a wet prairie (full descriptions in WDFW PHS report p. 161 - see web link above). X Instream: The combination of physical, biological, and chemical processes and conditions that interact to provide functional life history requirements for instream fish and wildlife resources. Nearshore: Relatively undisturbed nearshore habitats. These include Coastal Nearshore, Open Coast Nearshore, and Puget Sound Nearshore. (full descriptions of habitats and the definition of relatively undisturbed are in WDFW report - see web link on previous page). — Caves: A naturally occurring cavity, recess, void, or system of interconnected passages under the earth in soils, rock, ice, or other geological formations and is large enough to contain a human. — Cliffs: Greater than 25 ft (7.6 m) high and occurring below 5000 ft elevation. — Talus: Homogenous areas of rock rubble ranging in average size 0.5 - 6.5 ft (0.15 - 2.0 m), composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May be associated with cliffs. Snags and Logs: Trees are considered snags if they are dead or dying and exhibit sufficient decay characteristics to enable cavity excavation/use by wildlife. Priority snags have a diameter at breast height of > 20 in (51 cm) in western Washington and are > 6.5 ft (2 m) in height. Priority logs are > 12 in (30 cm) in diameter at the largest end, and > 20 ft (6 m) long. Note: All vegetated wetlands are by definition a priority habitat but are not included in this list because they are addressed elsewhere. Wetland Rating System for Western WA: 2014 Update 15 Rating Form - Effective January 1, 2015 Attachment 7 M Wetland name or number CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS Wetland Type Category Check off any criteria that apply to the wetland. Circle the category when the appropriate criteria are met. SC 1.0. Estuarine wetlands Does the wetland meet the following criteria for Estuarine wetlands? — The dominant water regime is tidal, — Vegetated, and — With a salinity greater than 0.5 ppt Yes -Go to SC 1.1 Go= of an estuarine wetland SC 1.1. Is the wetland within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332-30-151? Yes = Category I No - Go to SC 1.2 Cat. I SC 1.2. Is the wetland unit at least 1 ac in size and meets at least two of the following three conditions? —The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has less than 10% cover of non-native plant species. (If non-native species are Spartina, see page 25) Cat. —At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un- mowed grassland. —The wetland has at least two of the following features: tidal channels, depressions with open water, or Cat. II contiguous freshwater wetlands. Yes = Category I No = Category II SC 2.0. Wetlands of High Conservation Value (WHCV) SC 2.1. Has the WA Department of Natural Resources updated their website to include the list of Wetlands of High Conservation Value? Yes - Go to SC 2.2 No - Go to SC 2.3 Cat. SC 2.2. Is the wetland listed on the WDNR database as a Wetland of High Conservation Value? Yes = Category I No = Not a WHCV SC 2.3. Is the wetland in a Section/Township/Range that contains a Natural Heritage wetland? http://wwwl.dnr.wa.gov/nhp/refdesk/datasearch/wnhpwetlands.pdf Yes - Contact WNHP/WDNR and go to SC 2.4 No = Not a WHCV SC 2.4. Has WDNR identified the wetland within the S/T/R as a Wetland of High Conservation Value and listed it on their website? Yes = Category I No = Not a WHCV SC 3.0. Bogs Does the wetland (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key below. If you answer YES you will still need to rate the wetland based on its functions. SC 3.1. Does an area within the wetland unit have organic soil horizons, eit�hey or mucks, that compose 16 in or >eas more of the first 32 in of the soil profile? o to SC 3.3 No - Go to SC 3.2 SC 3.2. Does an area within the wetland unit have organic soils, either peaks, that are less than 16 in deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on top of a lake or pond? Yes - Go to SC 3.3 No = Is not a bog SC 3.3. Does an area with peats or mucks have more than 70% cover of mosses at ground level, A t least a 30% cover of plant species listed in Table 4? Yes = Is a Category I bog No -.,Po to SC 3.4 NOTE: If you are uncertain about the extent of mosses in the understory, you may substitu at criterion by measuring the pH of the water that seeps into a hole dug at least 16 in deep. If the pH is less than 5.0 and the plant species in Table 4 are present, the wetland is a bog. Cat. SC 3.4. Is an area with peats or mucks forested (> 30% cover) with Sitka spruce, subalpine fir, western red cedar, western hemlock, lodgepole pine, quaking aspen, Engelmann spruce, or western white pine, AND any of the species (or combination of species) listed in Table 4 provide more than 30% of the cover e Che canopy? Yes = Is a Category I bog No = s not a bog Wetland Rating System for Western WA: 2014 Update 16 Rating Form - Effective January 1, 2015 Attachment 7 Wetland name or number A SC 4.0. Forested Wetlands Does the wetland have at least 1 contiguous acre of forest that meets one of these criteria for the WA Department of Fish and Wildlife's forests as priority habitats? If you answer YES you will still need to rate the wetland based on its functions. — Old -growth forests (west of Cascade crest): Stands of at least two tree species, forming a multi -layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) that are at least 200 years of age OR have a diameter at breast height (dbh) of 32 in (81 cm) or more. Mature forests (west of the Cascade Crest): Stands where the largest trees are 80- 200 years old OR the species that make up the canopy have an average diameter (dbh) exceeding 21 in (53 cm). Yes = Category I (R)of a forested wetland for this section Cat. I SC 5.0. Wetlands in Coastal Lagoons Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? — The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from marine waters by sandbanks, gravel banks, shingle, or, less frequently, rocks —The lagoon in which the wetland is located contains ponded water that is saline or brackish (> 0.5 ppt) during most of the year in at least a portion of the lagoon (needs to be measured near the bottom) Cat. Yes - Go to SC 5.1 No Not a wetland in a coastal lagoon SC 5.1. Does the wetland meet all of the following three conditions? —The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has less than 20% cover of aggressive, opportunistic plant species (see list of species on p. 100). Cat. 11 —At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un- mowed grassland. —The wetland is larger than Vio ac (4350 ftz) Yes = Category I No = Category II SC 6.0. Interdunal Wetlands Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? If you answer yes you will still need to rate the wetland based on its habitat functions. In practical terms that means the following geographic areas: — Long Beach Peninsula: Lands west of SR 103 — Grayland-Westport: Lands west of SR 105 Cat — Ocean Shores-Copalis: Lands west of SR 115 and SR 109 Yes - Go to SC 6.1 (Dot of an interdunal wetland for rating SC 6.1. Is the wetland 1 ac or larger and scores an 8 or 9 for the habitat functions on the form (rates H,H,H or H,H,M Cat. 11 for the three aspects of function)? Yes = Category I No - Go to SC 6.2 SC 6.2. Is the wetland 1 ac or larger, or is it in a mosaic of wetlands that is 1 ac or larger? Yes = Category II No - Go to SC 6.3 Cat. III SC 6.3. Is the unit between 0.1 and 1 ac, or is it in a mosaic of wetlands that is between 0.1 and 1 ac? Yes = Category III No = Category IV Cat. IV Category of wetland based on Special Characteristics w A If you answered No for all types, enter "Not Applicable" on Summary Form Wetland Rating System for Western WA: 2014 Update 17 Rating Form - Effective January 1, 2015 Attachment 7 Legend 0 Forested Remainder of wetland is herbaceous Data Source: Bing Maps Carbon Recovery Project LANDAU Wastewater Treatment Plant AssOCIATES I Edmonds, Washington Note 1. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. 0 150 300 Scale in Feet Cowardin Plant Classes I Figure F-1 Attachment 7 IJec end o Culvert (outlet) 0 Seasonally flooded/inundated (remainder of wetland is saturated) Data Source: Bing Maps Carbon Recovery Project LANDAU Wastewater Treatment Plant AssOCIATES Edmonds, Washington Shellabarger Creek 150 ft setback 0 150 300 Scale in Feet Note 1. Black and white reproduction of this color original may reduce its effectiveness and lead to incorrect interpretation. Hydroperiods Figure F-2 Attachment 7 4/13/2021 StrearnStats Figure F-3. Contributing Basin StrearriStats Report Region ID: WA Workspace ID: WA20210413171431562000 Clicked Point (Latitude, Longitude): 47.80645, -122.38083 Time: 2021-04-13 10:14:52 -0700 < F Walnut St Cedar St r-rmn o� ni-i �j �,e r_h .1 _ — a mh4 -Luce St > Edmonds F < 214th PI SW -rri at Park 4P Ly Pa rK t ti 111on 2 1A. F I CH P I Svv_ CD > -CID Fr ct1. < ilrn LO -Raw"* M =77i .k. n-4 11\ Basin Characteristics 21 21 Tth St 3 — F __= Parameter Code Parameter Description Value Unit DIRINAIREA Area that drains to a point on a stream 0.27 square miles General Disclaimers The delineation point is in an exclusion area. URBAN AREA: STREAMFLOW ESTIMATES MAY NOT BE VALID https://streamstats.usgs.gov/ss/ Attachment 7 1/2 4/13/2021 StreamStats USGS Data Disclaimer: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied ismade regarding the display or utility oft he data for other purposes, nor on all computer systems, nor shalIt he act of distribution constitute any such warranty. USGS Software Disclaimer: This software has been approved for release by the U.S. Geological Survey (USGS). Although the software has been subjected to rigorous review, the USGS reserves the right to update the software as needed pursuant to further analysis and review. No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. Furthermore, the software is released on condition that neither the USGS north U.S. Governments ha I I be held liable for any damages resulting from its authorized or unauthorized use. USGS Product Names Disclaimer: Any use of trade, firm, or product names is ford escriptive purposes only and does not implyendorsement by the U.S. Government. Application Version: 4.5.1 StreamStats Services Version: 1.2.22 NSS Services Version: 2.1.1 https://streamstats.usgs.gov/ss/ Attachment 7 2/2 Figure F-5. 303d Listings April 13, 2021 �r / Cow Center Playrle►9 Fapro Sprague St 9 z vtts f � f 4]S y C ivic Center Q r.rlwtts �y = Playfreld t Landui:� ,' g Scud, z a" E nde. f `RAJ s to n C L �� Ferry 2JT A rrrlra N. ^ El: 11 Edrnor(ds J Sounder- Garry EdmQnrfc f Edmonds North Station r 104 Epuio Ombu ,_ - d W Dayton SI Dayton St +r a v, r Q y V � Vl w L kfwik; ��1 � v n D Alder St < Wetland Vicinity Alder l 4 Beck Ln .n S! Pancake Sitiel eberger Creak Faus holly f.'i Ednxnds Marsh IGA Howell YVay Ho me land' g r Edmonds Hemlock Way City Park Assessed Water/Sediment Water Category 5 - 303d Category 4C Category 4B Category 4A Category 2 Category 1 Sediment ® Category 5 - 303d [M Category 4C ® Category 4B M] Category 4A '/r/, Category 2 ® Category 1 Miles Sources: Esri, HERE, Garmin, Intermap, increment P Corp., GEBCO, USGS, 0 0.05 0.1 0.2 DEPARTMENT OF FAO, NPS,ME NEsriC Ge(Hong KongIGN,), Kadaster tre MapcontOrdnance Survey, Esri Attachment 7 � ECOLOGY Japan, METI, Esri China (Hong Kong), (c) OpenStreetMa contributors, and State of Washington 4/13/2021 Figure F-6. TMDL Listing Snohomish County I Washington State Department of Ecology None listed in project vicinity DEPARTMENT OF ECOLOGY Snohomish County State of Washington Ecology homepage > Water & Shorelines > Water improvement > Total Maximum Daily Load process > Directory of projects > Snohomish County Water quality improvement projects Select the waterbody or pollutant name to find more information about the specific project. Waterbody Name(s) Pollutant(s) Status Project Lead(s) Tricia Shoblom Ballinger Lake Total Phosphorus EPA approved 425-649-7288 Bear -Evans Creek Fecal Coliform EPA approved Ralph Svricek Basin 425-649-7165 Dissolved Bear -Evans Creek Oxygen EPA approved Ralph Svricek Basin 425-649-7165 Temperature Dissolved French and Pilchuck Oxygen Under development Heather Khan Creeks 425-649-7003 Temperature Under development as Tricia Shoblom Lake Ketchum Total Phosphorus a straight to 425 649 7288 implementation project Under development as Tricia Shoblom Lake Loma Total Phosphorus a straight to 425 649 7288 implementation project Ralph Svricek Little Bear Creek Fecal Coliform EPA approved 425-649-7165 EPAapproved and Ralph Svricek North Creek Fecal Coliform Has an implementation 425-649-7165 plan Old Stillaguamish Dissolved Ralph Svrjcek On hold Channel Oxygen 425-649-7165 RaIOL- vricek Snohomish River Dioxin EPA approved 425-649-7165 Snohomish River: Dissolved Ralph Svricek EPAapproved tu Esary Oxygen 425-649-7165 Snohomish River: Fecal Coliform EPA approved and Ralph Svricek https://fortress.wa.gov/ecy/ershare/wq/WaterQualitylmprovement/ i ivruL/Sno�omis' Flo unty.ttm 1/2 4/13/2021 Snohomish County I Washington State Department of Ecology Tributaries Has an implementation 425-649-7165 plan Ammonia-N Fecal Coliform Ralph Svrlcek Snoqualmie River pH EPA approved Dissolved 425 649 7165 Oxygen EPAapproved and Ralph Svrlcek Snoqualmie River Temperature Has an implementation plan 425-649-7165 Arsenic Dissolved Qxygen EPAapproved and Ralph Svrlcek Stillaguamish River Fecal Coliform Has an implementation Mercury plan 425-649-7165 pH Temperature EPA approved and Ralph Svrlcek Swamp Creek Fecal Coliform Has an implementation plan 425-649-7165 To request ADA accommodation, call Ecology at 360-407-7668, 711 (relay service), or 877- 833-6341 (TTY). More about our accessibility services. Copyright © Washington State Department of Ecology f/TNfIIL"/5Cn'oo https://fortress.wa.gov/ecy/ershare/wq/WaterQuaIityImprovemenoM ern tty.htm 2/2 APPENDIX G ECDC 23.5O.O40(F)(1)(f) -Required Measures to Minimize Impacts to Wetlands Attachment 7 Appendix G ECDC 23.50.040(F)(1)(f). Required Measures to Minimize Impacts to Wetlands Disturbance Required Measures to Minimize City of Edmonds WWTP Carbon Impacts Recovery Project Evaluation Lights Direct lights away from wetland Not applicable, the project does not include any new exterior lighting. Noise Locate activity that generates noise The proposed project does not include away from wetland installation of noise generating • If warranted, enhance existing buffer equipment in the wetland buffer. with native vegetation planting Noise in the buffer will be temporary adjacent to noise source during construction. • For activities that generate relatively continuous, potentially disruptive noise, such as certain heavy industry or mining, establish an additional 10- foot heavily vegetated buffer strip immediately adjacent to the outer wetland buffer Toxic runoff . Route all new, untreated runoff away No new pollution generating from wetland while ensuring wetland impervious surface is included as part is not dewatered of the proposed project. • Establish covenants limiting use of pesticides within 150 feet of wetland • Apply integrated pest management Storm water runoff • Retrofit storm water detention and No new pollution generating treatment for roads and existing impervious surface is included as part adjacent development of the proposed project. • Prevent channelized flow from lawns that directly enters the buffer • Use low -intensity development techniques (for more information see storm water ordinance and manual) Change in water regime • Infiltrate or treat, detain, and Runoff from the proposed loading disperse into buffer new runoff from dock will follow existing topography. impervious surfaces and new lawns Pets and human • Use privacy fencing or plant dense Not applicable, the proposed project disturbance vegetation to delineate buffer edge will not provide new access for and to discourage disturbance using pets/human disturbances. vegetation appropriate for the ecoregion • Place wetland and its buffer in a separate tract or protect with a conservation easement Dust • Use best management practices Appropriate BMPs will be employed (BMPs) to control dust during construction. Wetland/Waterway Critical Areas Report 0074209.010.011 Edmonds WWTP Carbon Recovery Project G-1 May 7, 2021 Attachment 7 APPENDIX H Mitigation Planting Specifications Attachment 7 Mitigation Planting Specifications City of Edmonds Wastewater Treatment Plant Carbon Recovery Project Edmonds, Washington May 7, 2021 Prepared for City of Edmonds 121 5th Avenue North Edmonds, Washington LANDAU ASSOCIATES 130 2nd Avenue South Edmonds, WA 98020 (425) 778-0907 Attachment 7 Landau Associates Mitigation Planting Specifications City of Edmonds Wastewater Treatment Plant Carbon Recovery Project Edmonds, Washington This document was prepared by, or under the direct supervision of, the technical professionals noted below. Document prepared by: P.`f Steve Quarterman Seni r Associate Document reviewed by: C��4�zl6 " Jeffrey Fellows, PE LI Principal Date: May 7, 2021 Project No.: 0074209.010.011 File path: P\074\209.010\R\CritAreas\Appendix H Specifications\ Critical Areas Mitigation_Specifications_rpt 05052021.docx Project Coordinator: KJG LANDAU ASSOCIATES Attachment 7 Landau Associates This page intentionally left blank. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H-iii May 7, 2021 Attachment 7 Landau Associates TABLE OF CONTENTS Page 1.0 GENERAL........................................................................................................................................1-1 1.1 Scope of Work....................................................................................................................1-1 1.2 Quality Assurance...............................................................................................................1-1 1.3 Qualifications of Installer...................................................................................................1-1 1.4 Work Schedule....................................................................................................................1-2 1.5 Project Records and Review...............................................................................................1-2 1.6 Documentation...................................................................................................................1-2 1.7 Underground Utilities and Existing Conditions..................................................................1-2 1.8 Checklist and Project Closeout...........................................................................................1-2 2.0 MATERIALS.....................................................................................................................................2-1 2.1 Plant Materials...................................................................................................................2-1 2.1.1 Container Plants (Trees, Shrubs)......................................................................2-1 2.1.2 Seed Mix..........................................................................................................2-1 2.1.3 Temporary Storage..........................................................................................2-2 2.1.4 Substitutions...................................................................................................2-2 2.2 Mulch..................................................................................................................................2-2 2.3 Fertilizer Tablets.................................................................................................................2-2 3.0 EXECUTION .....................................................................................................................................3-1 3.1 Site and Project Preparation..............................................................................................3-1 3.1.1 Order Materials...............................................................................................3-1 3.1.2 Mark Limits of Clearing....................................................................................3-1 3.1.3 Minimization of Impacts..................................................................................3-1 3.1.4 Removal of Structures and Obstructions..........................................................3-1 3.1.5 Verification of Suitable Surface Conditions......................................................3-1 3.1.6 Clearing and Grubbing.....................................................................................3-1 3.2 Planting and Protection......................................................................................................3-2 3.2.1 Layout Plants...................................................................................................3-2 3.2.2 Approve Planting Locations and Spacing..........................................................3-2 3.2.3 Plant Installation..............................................................................................3-2 3.2.3.1 Container Trees and Shrubs.......................................................................3-2 3.2.3.2 Seeding......................................................................................................3-3 3.2.4 Mulch..............................................................................................................3-3 3.3 Rectification of Accidental Plant Injury..............................................................................3-3 3.4 Cleanup...............................................................................................................................3-4 3.5 Checklist and Closeout.......................................................................................................3-4 4.0 MAINTENANCE...............................................................................................................................4-1 Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H-iv May 7, 2021 Attachment 7 Landau Associates 13le111 N *1 Figure Title Enhancement Plan Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H-v May 7, 2021 Attachment 7 Landau Associates LIST OF ABBREVIATIONS AND ACRONYMS City.........................................................................................................City of Edmonds Specifications..............................................................Mitigation Planting Specifications Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H-vi May 7, 2021 Attachment 7 Landau Associates This page intentionally left blank. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H-vii May 7, 2021 Attachment 7 Landau Associates 1.0 GENERAL These Mitigation Planting Specifications (Specifications) shall be reviewed by the City of Edmonds (City) prior to mitigation planting work so that the staff involved understand the intent and the specific details related to the construction documents, specifications, and site constraints. The following plans sheets (Drawings/Plans) correspond with this document: • Figure 5 Enhancement Plan The plantings shall be installed using the materials as shown on the Drawings and/or as specified in these Specifications. The mitigation plantings shall be installed to grades and conform to areas and locations as shown on the Drawings. The term "OWNER" as used in this Specification section shall refer to the City. The term "BIOLOGIST" as used in this Specification section shall refer to the City's biologist for the project (qualified City staff or hired consultant). 1.1 Scope of Work OWNER shall furnish all materials, equipment, labor, and related items necessary to complete the work shown on the Drawings and/or as described in these Specifications, to include addition of soil amendments and tilling of soil; installation of plants; fertilizing and mulching; protection; and other work, as necessary. The work included in these Specifications (whether mentioned or not) shall consist of all labor, tools, materials, permits, and other related items necessary for the installation of all plant -related materials and will be performed in accordance with these Specifications. 1.2 Quality Assurance Standard Specifications: American Standard for Nursery Stock, ANSI Z60.1-2004. American Nursery and Landscape Association, 1250 Eye Street NW, Suite 500, Washington, D.C. 20005. Hortus Third. The Staff of the L. H. Bailey Hortorium. 1976. MacMillan Publishing Co., New York, New York. 1.3 Qualifications of Installer Oversight of mitigation planting preparation and installation shall be provided by OWNER staff with a minimum of 3 years of experience with landscape implementation, and who have completed landscaping work similar in material, design, and extent to that indicated for this project and with a record of successful landscape establishment. OWNER staff or representative must be familiar and comply with American Standard for Nursery Stock published by the American Association of Nurserymen. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H1-1 May 7, 2021 Attachment 7 Landau Associates 1.4 Work Schedule In general, restoration plantings shall be installed no earlier than October 1 and no later than March 31. 1.5 Project Records and Review A copy of the approved plans, specifications, permits, and agency approvals must be on site whenever construction is in progress and shall remain on site until project completion. The OWNER shall be on site, as necessary, to monitor and/or approve any minor revisions to the plan. 1.6 Documentation The OWNER shall keep a complete set of plans at the job site during construction for the purpose of "red -lining" changes or modifications to the approved plans and shall update this information daily. Upon completion of the installation of the planting aspects of the mitigation project, the OWNER will create a set of clearly marked plans designating the actual locations and quantities of plantings within the mitigation area. These plans shall meet the requirement of an as -built survey. 1.7 Underground Utilities and Existing Conditions The OWNER shall be responsible for the protection of utilities. It is the sole responsibility of the OWNER to: (1) independently verify the accuracy of utility locations and (2) discover and avoid any utilities within the work area that may be affected by implementation of this plan. Such areas are to be clearly marked in the field. 1.8 Checklist and Project Closeout The BIOLOGIST shall verify that all items meet the Specifications listed in this document. Any items that do not meet Specifications will be marked on a checklist for rectification prior to the next phase of work and/or project closeout. If items are to be corrected, a contingency checklist of adaptive management strategies necessary to meet Specifications shall be prepared by the BIOLOGIST and submitted to the OWNER. After punch list items have been completed by the OWNER, the BIOLOGIST shall review and revise the checklist to reflect satisfactory completion. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H1-2 May 7, 2021 Attachment 7 Landau Associates 2.0 MATERIALS The BIOLOGIST shall examine plant and soils materials prior to unloading at the site. Any material not meeting the required Specifications shall be immediately removed from the site and replaced with like material that meets the required standards. 2.1 Plant Materials Plant material shall be provided by OWNER and shall meet the requirements of the current edition of the American Standard for Nursery Stock, and state and federal laws with respect to plant disease and infestations. Plant materials shall be locally grown (western Washington, western Oregon, or western British Columbia), healthy, bushy, in vigorous growing condition, and be guaranteed true to size, name, and variety. Furthermore, plants shall be free from disease, injury, insects, insect eggs, root and other types of weevils, larva, weed roots, and defects such as knots, sun scald, injuries, abrasions, disfigurements, and irregular growth arising from frost damage. Unacceptable materials shall be replaced and shall be immediately removed from the project site. The BIOLOGIST shall inspect plant material at the job site for compliance with required standards for plant size and quality prior to planting. This includes, but is not limited to, size and condition of root systems, presence of insects, latent injuries, and defects as listed below: 2.1.1 Container Plants (Trees, Shrubs) • Trees shall have uniform branching; single, straight trunks (unless specified as multi - stemmed); and the central leader intact and undamaged. • Unless necessary for larger trees, do not stake plants for support. • Do not prune or top plants before delivery, except as approved by BIOLOGIST. • Protect bark, branches, and root systems from sun scald, drying, sweating, whipping, and other handling and tying damage. • Do not bend or bind -tie plants in such a manner as to destroy the natural shape. Provide protective covering during delivery. Do not drop plants during delivery. • Container stock shall be fully rooted but not root bound. • The original central leader on tree stock must be healthy and undamaged. • Plants shall be the size indicated on the Drawings/Plans. 2.1.2 Seed Mix Seed mix shall be commercially prepared and supplied in sealed containers. The labels shall show: (1) Common and botanical names of seed, (2) Lot number, (3) Net weight, (4) Pounds of Pure live seed (PLS) in the mix, and (5) Origin of seed. All seed vendors must have a business license issued by supplier's state or provincial Department of Licensing with a "seed dealer" endorsement. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H2-1 May 7, 2021 Attachment 7 Landau Associates 2.1.3 Temporary Storage Plants/seed mix must be stored in the manner necessary to accommodate their horticultural requirements. Protect plant/seed material stored on site from weather damage, construction activity, and the public. Protect bare roots by covering with moist soil, mulch, or sawdust. Water as required to keep roots moist. Keep plants moist and shaded until the actual time of installation. Do not allow any plants or stakes to be exposed to freezing temperatures prior to planting. 2.1.4 Substitutions Substitutions of plant species or sizes may be permitted based on plant availability, but only with prior approval by the BIOLOGIST. 2.2 Mulch Mulch shall consist of bark pieces or wood chips with maximum axis of any single piece not exceeding approximately 2 inches. 2.3 Fertilizer Tablets Trees and shrubs shall be fertilized using one of the following products or similar: 1. Formula 4-2-2 "Transplanter" as manufactured by Pacific Agro Co., with Hercules nitroform and W.R. Grace's "Magamp" and trace elements. Apply at a rate of: a. Trees: 8 ounces b. Shrubs: 2 ounces. 2. Agriform Tablets: Planting tablets, 21-gram size, as manufactured by Agriform International Chemicals, Inc., 20-10-5 analysis. Apply at a rate of: a. Trees: 4 tablets for every foot of rootball diameter b. Shrubs: 3 tablets. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H2-2 May 7, 2021 Attachment 7 Landau Associates 3.0 EXECUTION These Specifications apply to all aspects of the mitigation project installation and are generally listed in the order that they will be implemented. 3.1 Site and Project Preparation 3.1.1 Order Materials Items to be ordered upfront include mulch and jute netting. These items, which may need substantial lead time to acquire and alterations from the plan (due to availability), must be verified by the BIOLOGIST prior to ordering. 3.1.2 Mark Limits of Clearing Prior to any construction, OWNER shall stake and/or flag limits of clearing on site, as shown on the Drawings. 3.1.3 Minimization of Impacts Clearing will be conducted using the lightest machinery that is still capable of performing the work. Compaction of planting areas shall be avoided and minimized to the greatest extent possible. Revegetation will occur as soon as possible following clearing. 3.1.4 Removal of Structures and Obstructions Materials encountered within the planting area that creates conditions unsuitable for plant establishment as determined by the BIOLOGIST shall be removed by the OWNER from the site. Such materials may include trash and debris (e.g., tires, concrete rubble, scrap metal, etc.). 3.1.5 Verification of Suitable Surface Conditions Following clearing, the BIOLOGIST will verify that soil conditions are suitable within the work areas, including soil composition and degree of compaction. Any unsatisfactory conditions (such as compaction or lack of organic matter) shall be corrected by the OWNER prior to the start of work. De -compact soil to a depth of 18 inches where construction activities have taken place or where native soils are compacted. 3.1.6 Clearing and Grubbing In the planting area, the OWNER shall remove weedy or exotic invasive species identified by BIOLOGIST prior to plant installation; lists of weedy and/or exotic invasive species likely to be encountered are included below. A complete list of non-native species can be found at the Washington State Noxious Weed Control Board (http://www.nwcb.wa.gov/). Species identified within the buffer mitigation area and their proposed management include, but are not limited to: Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H3-1 May 7, 2021 Attachment 7 Landau Associates • English ivy should be controlled and removed by cutting climbing vines and prying vines from trees, and hand pulling plant from the ground. Plant parts should be placed immediately into a plastic garbage bag and removed from the site. English laurel and Portugal laurel should be controlled by cutting and stump removal with removing as much root as possible. Stems can be chipped and used as mulch or taken to a landfill. Leaving stems on moist ground might result in some stem -rooting. Revegetation will occur as soon as possible following clearing. 3.2 Planting and Protection 3.2.1 Layout Plants Plants shall be placed in a random, natural pattern as shown on the plans. Planting locations shown on planting plans are approximate and based on anticipated site conditions. Actual planting locations may vary from those shown due to final site conditions and locations of existing vegetation. Any substantial variations from the planting plan will require prior approval by the BIOLOGIST. 3.2.2 Approve Planting Locations and Spacing BIOLOGIST shall approve proposed plant locations and layout prior to installation by the OWNER. 3.2.3 Plant Installation Detailed directions for planting are described below. Also refer to the Drawings. Revegetation will occur as soon as possible following clearing. 3.2.3.1 Container Trees and Shrubs Plant, tree, and shrub spacing is to be random (natural) and not in a regular grid pattern. The following directions, adapted from the International Society of Arboriculture, must be followed for container plantings (see Details on Drawings/Plans): Dig a shallow, broad planting hole. Make the hole wide, as much as three times the diameter of the root ball but only as deep as the root ball. It is important to make the hole wide because the roots on the newly establishing tree must push through surrounding soil in order to establish. On most planting sites in new developments, the existing soils have been compacted and are unsuitable for healthy root growth. Breaking up the soil in a large area around the tree provides the newly emerging roots room to expand into loose soil to hasten establishment. Identify the trunk flare on tree/shrub. The trunk flare is where the roots spread at the base of the tree. This point should be partially visible after the tree has been planted. If the trunk flare is not partially visible, some soil from the top of the root ball may need to be removed. Locating the trunk flare is important for determining how deep the hole needs to be for proper planting. Place the tree/shrub at the proper height. Before placing in the hole, check to see that the hole has been dug to the proper depth and no deeper. The majority of the roots on the Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H3-2 May 7, 2021 Attachment 7 Landau Associates newly planted tree/shrub will develop in the top 12 inches of soil. If the tree is planted too deeply, new roots will have difficulty developing because of a lack of oxygen. It is better to plant the tree a little high, 2 to 3 inches above the base of the trunk flare, than to plant it at or below the original growing level. To avoid damage when setting the tree in the hole, always lift the tree by the root ball and never by the trunk. 4. Straighten the tree in the hole. Before backfilling, view the tree from several directions to confirm that the tree is straight, as it is difficult to reposition the tree. 5. Fill the hole gently but firmly. Fill the hole about one-third full and gently but firmly pack the soil around the base of the root ball. 6. Apply fertilizer tablet into hole at 6 inches depth, or per manufacturer instructions as needed. 7. Fill the remainder of the hole, taking care to firmly pack soil to eliminate air pockets that may cause roots to dry out. To avoid this problem, add the soil a few inches at a time and settle with water. Continue this process until the hole is filled and the tree is firmly planted. 8. Do not stake trees, unless necessary. 9. Immediately (on the day of installation) water all plants thoroughly unless soils are already saturated. 10. Mulch the base of the planting. When placing mulch, be sure that the actual trunk of the tree/shrub is not covered. Doing so may cause decay of the living bark at the base of the tree/shrub. A mulch -free area, 1 to 2 inches wide at the base of the tree, is sufficient to avoid moist bark conditions and prevent decay. 3.2.3.2 Seeding When seeding by hand, the seed shall be incorporated into the top % inch of soil by hand raking or other method that is allowed by the BIOLOGIST. 3.2.4 Mulch Mulch shall be applied around all plants throughout the planting to provide weed suppression, insulation, a source of organic matter, and prevent erosion. At least a 3-inch layer of wood chip mulch (coarse mulch or hog fuel) shall be placed around the base of all new plantings to a radius of at least 24 inches. 3.3 Rectification of Accidental Plant Injury Any living woody plant that is damaged during construction shall be treated within 24 hours of occurrence, including wound -shaping treatment, which includes, but is not limited to, evenly cutting broken branches, exposed roots, and damaged tree bark immediately after damage occurs. Injured plants shall be thoroughly watered, and additional measures shall be taken, as appropriate, to aid in plant survival. Any plants that are visibly harmed such that future growth is jeopardized (such as broken leaders, uprooting, etc.) shall be replaced. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H3-3 May 7, 2021 Attachment 7 Landau Associates 3.4 Cleanup The OWNER shall be responsible for removing construction materials and debris from the site following installation of plant materials. 3.5 Checklist and Closeout The BIOLOGIST shall verify that all items meet the Specifications listed in this document. Any items that do not meet Specifications will be marked on a checklist for rectification prior to the next phase of work and/or project closeout. If items are to be corrected, a contingency checklist of adaptive management strategies necessary to meet Specifications shall be prepared by the BIOLOGIST and submitted to the OWNER. After punch list items have been completed by the OWNER, the BIOLOGIST shall review and revise the checklist to reflect satisfactory completion. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H3-4 May 7, 2021 Attachment 7 Landau Associates 4.0 MAINTENANCE This section includes recommended maintenance for installed plantings, including, but not limited to: • Correction of Foraging and Browsing: The OWNER may implement measures to prevent damage of plant material by browsing animals (e.g., deer, beaver, rabbits, mice, voles). • Weeding and Maintenance of Trees and Shrubs: Routine maintenance of trees and shrubs shall be performed. Tall grasses shall be weeded at the base of the plantings. Weed control shall be performed by hand removal or installation of weed barrier cloth. No mechanical weed trimmers shall be used after initial site preparation activities. • Pruning of Woody Plants: Woody plants may be pruned to allow for safe use of park facilities. • Resetting plants to proper grade and upright position, controlling grass and invasive species, and correcting drainage problems, as required. • Irrigation to ensure plant survival. Replacements made by the OWNER shall be completed during the periods set out as planting periods and shall be subject to the same conditions and shall be made in the same manner as specified for the original planting area. OWNER shall be responsible for consistent and adequate water application throughout the growing season. Mitigation Planting Specifications 0074209.010.011 City of Edmonds WWTP Carbon Recovery Project H4-1 May 7, 2021 Attachment 7 ;I. Clearing Limits (Temporary Impacts) \ N Temporary Construction Access Platform Top of Platform to Match Bottom of Temporary Wall Opening Which will be Closed up with Removable Panels after Construction. Overall Platform Dimensions During Construction 12'W x 25'D. After Construction Leave in Place a 12'W x 12'D Portion to be Permanently Installed. Loading Dock (Temporary Section) ■ Property Line fi FD Carbon Filter (Proposed) I I rD FAN Mcc I T RQOM SOLIDS HANDLING rl ROOM Loading Dock �— (Permanent Section) I PLC IGYM -x. MCC i HYPOCHLORITE -� STORAGE - II SOLIDS QA PROCESS 04JILONG --------------- If I 1 �I uco.�iw an:iw.c POLYMER FEED r SOLIDS CSAL ROOM e Ir OFFICE STORAGE Wall Opening �J (Proposed) Wall Opening Shrub Trimming within 5ft of building, (Proposed) but no clearing on south side of building a: Downed trees from clearing limits to be Zplaced in this vicinity as downed large wood f �♦ l Wetland A Wetland continues to the south and east Legend Note Clearing Limits Grass Seed Mix Enhancement Area (460 sf) 1. Black and white reproduction of this color original may reduce its effectiveness and — Wetland Line Tree /Shrub /Ground Cover Enhancement Area (795 sf) lead to incorrect interpretation. — — Wetland Buffer (110 ft) %I 0 30 60 LANDAU Scale in Feet ASSOCIATES ToPOF ROMALLTO8E FLUSH WFrH ORSLIGHTLY ABOVE FINISHED GRADE — SET SHRUB VTRAN3H7 AND PLAC£ ROOTSALL O N SOL ID GRO LIND O R ON CON PACTED R4CKF ILL SEE SPECIFICATIONS FOR INSCRUCT1ONS ON PLANTINSFALL4TION. EXTRA GOIL SHALL BE LOCATED PER THE 0IRECT10N OF THE SIOLOGI87OR ENGINEER. F IN ISHEO G RAI) E r SCARIFYSIDESOF ROOTBALL PLACES'OF BARK MULCH IN SAUCERTO VATHIN:P OG THE - TRUNK. ALL CONTAINER PLANTS EE RECEIVEA24'DIA RFOR R j ` �- �`EX$3TING NATIVE &DIL OR RESTORATION PLANTING ONLY I .... - j N EtAlY COM PAGTEO TO PSOIL PLA WING P T - 3 TIMES ROOTEALL DIAMETER f'l'�CONTAINER PLANTING DETAIL W-7 , SCALE: NTS TYPICAL ON -CENTER PLANTING GR1D— ❑ F FSET PLANTS TO AVOID STRAIGHT RC P DOM PLANTING DETAIL SCALE' NTS CL (IMP AND SCATTER PLANTS SO THATAVERAGE PLANTING OENSRY IS EQ UIVA LE NT To GRI D SPACING MLY MDC PLANT S PECIES Enhancement Plantings TOTAL AREA = 1,255 sq ft) Scientific Name ICommon Name I#of Plants IStock Size (Spacing (C.C.) Trees Pinuscontorta Shore pine 1 4 6ftmin height 14ft Shrubs Acercircinatum Vine maple 4 8ftmin height 6ft Rhododendron macrophyllum Pacific rhododendron 4 1.5 ft min height 6 ft Ribes sanguineum Flowering currant 5 1.5 ft min height 6 ft Gaulthoria shallon Salal 5 1.5 ft min height 6 ft Groundcovers Refer to Grass Seed Mix Table Grass Seed Mix isee Grass Seed Mix N/A 460 sq ft Notes: Grass seed mix is limited to area within 6 ft of the SR 104 sidewalk and area of temporary loading dock; no trees orshurbs shall be placed within 6ft from the edge of pavement. Grass Seed Mix Scientific Name Festuca rubra ICommon Name Red fescue I Percent by weight 30 I Application 1201bs/acre Elym us glaucus Blue wildrye 30 Bromus corinatus California brome 30 Festuca idahoensis Idaho fescue 10 Downed Tree Placement Notes 1. Retain segments of tree trunks from 4 to 6 feet in length or longer from trees to be removed. 2. Branches may be trimmed and placed on downed trees as habitat piles. 3. Habitat piles shall be layered with larger material at/near base. 4. Avoid damage to adjacent vegetation when placing downed trees. Sources: BHC Consultants, 2020; King C unty Imager Edmonds WWTP Figure Carbon Recovery Project Enhancement Plan Edmonds, Washington Attachment 7