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Home My WebLink AboutRS_ Wetland, Stream, Shorline Report_KC Solar Lights_v1 2801 Alaskan Way Suite 200 Seattle, WA 98121 206.789.9658 phone 206.789.9684 fax esassoc.com memorandum date May 29, 2025 to Tom Early, Capital Project Manager, King County Department of Natural Resources and Parks from Jessica Redman, PWS subject King County Climate Equity Solar Project – City of Renton At the request of King County Department of Natural Resources and Parks (DNRP), Environmental Science Associates (ESA) conducted a field investigation and reconnaissance of critical areas at four sites where DNRP is proposing the installation of trail lighting as part of the Climate Equity Solar Project. The Climate Equity Solar Project, also known as the Solar Lighting for Parks, Trails and Shelters, is an initiative to install solar panels and energy efficient LED lighting to enhance safety for park visitors by increasing visibility in parks, particularly during low-light hours. The project is part of a larger effort to address community needs and create a more inclusive and safer environment for park visitors. Proposed lights will have a base that is two feet in diameter and will be installed below the surface at a depth of approximately nine feet. The purpose of this memorandum is to assist DNRP in the local permitting process for the light installations with the City of Renton (City). This critical areas investigation and reconnaissance was focused on wetlands, streams, and shorelines at the following four locations (Figure 1):  Boulevard Lane Park  Lake to Sound Trail at Monster Road  Eastrail Regional Trail at N. 41st Street  Eastrail Regional Trail at Mountain View Avenue North This technical memorandum details the results of the reconnaissance including: wetlands, their rating (according to Renton Municipal Code (RMC) 4-3-050G.9.a), and their buffer (according to RMC 4-3- 050G.2); streams and other aquatic areas, including their estimated typing and buffer width (according to RMC 4-3-050G.7.a and RMC 4-3-050G.2, respectively); and shorelines (according to RMC 4-3-090). Other critical areas, such as geological hazards and flood hazard areas are not part of this assessment, and will be permitted, as needed, independently. King County Climate Equity Solar Project – City of Renton 2 Methods Prior to conducting the site assessment, ESA biologists reviewed several existing resources regarding the presence of critical areas. These resources included the following:  City of Renton COR Maps (City of Renton 2025)  King County Interactive Mapping tool (iMap) (King County 2025).  U.S. Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) Mapper (USFWS 2025).  Natural Resources Conservation Service (NRCS), U.S. Department of Agriculture (USDA) Web Soil Survey (NRCS 2025).  WDFW Priority Habitats and Species (PHS) on the Web (WDFW 2025).  Statewide Washington Integrated Fish Distribution (SWIFD) online mapping (NWIFC 2025). Once on-site, ESA biologists assessed the entirety of the study area for the presence of critical areas. The study area included areas within 200 feet of the proposed location of each light. Wetlands were identified in the study area using the methods outlined in the U.S. Army Corps of Engineers Wetland Delineation Manual (Environmental Laboratory 1987) and the regional Supplement to the Corps of Engineers Wetland Delineation Manual; Western Mountains, Valleys, and Coast Region – Version 2.0 (USACE 2010). These methods rely on the presence of three criteria to determine wetland areas, including (1) the dominance of wetland (i.e., hydrophytic) plant species, (2) the presence of hydric soils, and (3) indicators of wetland hydrology such as soil saturation to the surface or water ponding. Soils, vegetation, and hydrologic conditions were observed; however, a formal wetland delineation did not take place. The assessment was conducted at a reconnaissance level and no official wetland data plots were established. Therefore, soils beneath the surface were not observed and instead, in areas where hydrophytic vegetation and wetland hydrology (e.g., surface water and/or saturation) were observed, hydric soils were assumed. Approximate wetland boundaries were recorded using the ArcGIS Field Maps application on an Apple iPad paired with an Eos Arrow submeter GNSS receiver. When areas of the study area were not accessible the study team relied on USFWS NWI, King County, and City of Renton mapping. Wetlands identified within the study area were classified using the Cowardin Classification System, which categorizes wetlands by vegetation cover and hydrological regime (Cowardin et al. 1979). Additionally, a preliminary assessment of each wetland’s function was completed using the Washington State Wetland Rating System for Western Washington (Rating System) (Hruby & Yahnke 2014). The Rating System categorizes wetlands into four hierarchical categories (Categories I to IV) based on rarity, sensitivity to disturbance, and water quality, hydrologic, and habitat functions. The City of Renton has codified use of the Rating System (RMC 4-3-050G.9.a) and assigns standard wetland buffer widths based on wetland category and habitat score. Standard wetland buffer widths range from 50 feet to 200 feet (RMC 4-3-050G.2). ESA biologists used methods outlined in the Washington Department of Ecology’s Determining the Ordinary High Water Mark for Shoreline Management Act Compliance in Washington State (Anderson 2016) to assess streams. If streams were observed, the boundary closest to the proposed light installation King County Climate Equity Solar Project – City of Renton 3 was recorded using a GPS unit. In areas of the study area that were not accessible, the ordinary high water mark (OHWM) was estimated using aerial photography and LiDAR. Findings Two ESA biologists conducted the field investigation on April 30, 2025. Below is a summary of wetlands and streams observed during the field investigation. A brief discussion of the regulatory implications for critical areas at each individual site is also included. Site 1: Boulevard Lane Park King County DNRP is proposing to install one light at Boulevard Lane Park. The light will be installed in the southern extent of the park property (King County Parcel # 033-3323059057), on the west side of a walking path that connects the park and the Meeker Middle School property to the south (Figure 2). Mapped Critical Areas The City’s COR Maps, King County iMap, USFWS NWI, and WDFW PHS map the majority of the Boulevard Lake Park parcel as wetland. The wetland continues offsite to the north and south and is part of a larger wetland complex associated with Big Soos Creek. According to USFWS NWI, the wetland complex is a mix of palustrine forested (PFO), palustrine scrub-shrub (PSS), and palustrine emergent (PEM) cover. Big Soos Creek, which is mapped as flowing through the wetland and is a tributary to the Green River, is mapped as a fish-bearing stream (Type F). According to SWIFD online mapping, the reach of Big Soos Creek within the park does not contain documented salmonids. However, coho salmon (Oncorhynchus kisutch) and coastal cutthroat trout (O. clarkii) have been documented approximately 1.6 miles downstream of the site. Additionally, Chinook salmon (O. tshawytscha), a species listed as ‘threatened’ under the Endangered Species Act, have been documented approximately 6 miles downstream of the site. Results of Field Assessment One wetland was observed near the site of the proposed light installation at Boulevard Lane Park. The wetland is a depressional wetland dominated by PFO cover and is located at the toe of a slope. The forested canopy is dominated by willows (Salix spp.). Dominant species in the understory include salmonberry (Rubus spectabilis), skunk cabbage (Lysichiton americanus), and soft rush (Juncus effusus). Vegetation in upland areas immediately adjacent to the wetland is primarily mowed lawn. During the site visit, the majority of the wetland appeared inundated and water was observed flowing out of the wetland onto the grass lawn of the park, likely the result of beaver activity. The channel of Big Soos Creek was not observed during the site visit and was likely out of sight to the west or not visible due to the high inundation. Using the Rating System, the wetland at Boulevard Lane Park scored a total of 22 points, classifying it as a Category II wetland. The wetland provides a moderate function (7 points) for improving water quality because it has a high cover of persistent plants and is largely inundated, both features that can aid in trapping and filtering pollutants. The wetland also provides a high hydrological function (8 points) because it can contain floodwaters and runoff in an area that is highly developed and produces excess King County Climate Equity Solar Project – City of Renton 4 runoff. The wetland has a moderate habitat function (7 points) because it contains diverse and multi- structural vegetation, exhibits several hydroperiods, and contains habitat features such as snags and logs. Regulatory Implications Per RMC 4-3-050G.2, Category II wetlands with a moderate habitat function are required a 150-foot buffer. Additionally, per RMC 4-3-050G.2, Type F streams are required a 115-foot buffer. Therefore, if the stream channel of Big Soos Creek is located within the wetland, the wetland buffer would likely extend past any stream buffer onsite. The purpose of the proposed light is to enhance the safety of the trail that connects the Meeker Middle School to Boulevard Lane Park. The trail is located immediately adjacent to the wetland edge; and therefore, the light is being proposed in the wetland buffer. No direct wetland impacts are anticipated. The area where the light is being proposed is sparsely vegetated and highly compacted from pedestrian use. What vegetation does exist is managed, and primarily consists of mowed lawn or weedy species such as common dandelion (Taraxacum officinale). Additionally, based on a review of LiDAR imagery, the trail, park, and proposed location of the light are all likely established on fill that was placed to separate the park parcel from the wetland. In its current state, the portion of the buffer where the light is proposed provides minimal, if any, buffer function for the wetland. Therefore, the addition of the 2-foot radius concrete footing would not result in a loss of buffer function. Additionally, based on discussions with the City, the proposed light would likely be considered maintenance and therefore exempt from critical areas review. Per RMC 4-3-050C.3 (Footnote 14), “normal and routine maintenance, operation and repair of existing parks, trails, streets, roads, rights-of- way and associated appurtenances, facilities and utilities where no alteration or additional fill materials will be placed other than the minimum alteration and/or fill needed to restore those facilities or to construct new trails to meet established safety standards” are exempt activities and can be permitted in wetland and stream buffers. Additionally, the installation of illumination in a wetland and/or stream buffer, if in a public easement, is also exempt per RMC 4-3-050C.3 (Footnote 15), which states “within existing and improved public road rights-of-way or easements, installation, construction, replacement, operation, overbuilding or alteration of all natural gas, cable, communication, telephone and electric facilities, lines, pipes, mains, equipment or appurtenances, traffic control devices, illumination, walkways and bikeways” are also exempt. Per RMC 4-3-050C.3.2, a letter of exemption must be obtained from the Administrator prior to construction. Additionally, per RMC 4-3-050C.2.b, enhancement or mitigation may be required for exempt activities unless waved by the Administrator. However, as discussed above, due to the current disturbed conditions of the buffer at the proposed light location, a loss of buffer function is not anticipated; and therefore, no mitigation is proposed. Any temporary impacts to the buffer that may occur as a result of construction will be restored post-construction. King County Climate Equity Solar Project – City of Renton 5 Photo 1. Proposed location of light at Boulevard Lane Park Site 2: Lake to Sound Trail at BNSF Railway Crossing King County DNRP is proposing to install one light along the Lake to Sound Trail (Figure 3). The proposed location is on the east side of the Burlington Northern Santa Fe (BNSF) Railway underpass crossing, on the north side of the trail (King County Tax Parcel # 7229500330). Mapped Critical Areas No wetlands are mapped as occurring within 200 feet the location of the proposed light. One stream, the Black River, is mapped in the immediate vicinity of the site. This reach of the Black River is designated as a shoreline of the state (Type S), and is also a fish-bearing stream (Type F). According to SWIFD mapping, this reach of the Black River has documented use of several salmonid species including Chinook salmon, coho salmon, cutthroat trout, and steelhead trout (O. mykiss). The Black River flows east to west through the study area, and enters the Green River approximately 400 feet downstream of the King County Climate Equity Solar Project – City of Renton 6 proposed light location. Additional species documented in the Green River include sockeye salmon (O. nerka), pink salmon (O. gorbuscha), chum salmon (O. keta), and bull trout (Salvelinus confluentus), a species listed as ‘threatened’ under the Endangered Species Act. Results of Field Assessment One stream, the Black River, was observed in the vicinity of the proposed location of the light. No additional wetlands or streams were observed. The prosed location of the light is adjacent to the trail on the left bank of the Black River. Within the vicinity of the proposed light, the banks of the stream are steep and lined with large rock. During the April 30, 2025 site visit, it was estimated that the top of bank was approximately 10 feet above the elevation of the stream. No fish were observed during the site visit; however, the stream supports fish habitat due to its width and gradient. The area between the trail and the river is largely unvegetated and what vegetation is present, is primarily along the portions of the bank immediately adjacent to the stream. Vegetation here include mature black cottonwood (Populus balsamifera), vine maple (Acer circinatum), and invasive knotweed (Polygonum spp.). Vegetation in the area of the proposed light installation is managed and appeared to be recently cleared. Invasive tansy ragwort (Jacobaea vulgaris) was observed sprouting here. This area also had highly compacted soils and based on a review of aerial imagery from 1936, appears to likely be fill. Regulatory Implications The Black River is a Type F stream and is required a 115-foot buffer per RMC 4-3-050G.2. However, the Black River is also designated as a ‘shoreline of the state’ and is therefore regulated under RMC 4-3-090 – Shoreline Master Program (SMP) Regulations in addition to regulations in the City’s critical areas ordinance (CAO). Shoreline jurisdiction extends 200 feet landward of the OHWM of the river. The location of the proposed light is approximately 40 feet landward of the OHWM; and therefore, the project also requires review under the City’s SMP. The City classifies all of its shorelines into separate geographic areas known as ‘use environments’ that reflect local shoreline conditions, including environmental function, existing land uses, and the goals of the SMP. Each ‘use environment’ is represented by its own shoreline overlay district. According to COR mapping, the proposed light is located in the Shoreline Natural Environment Overlay District. According to the City’s Comprehensive Plan, the purpose of this district is to protect and preserve unique and fragile shoreline or wetland environments that are ecologically intact as close to their natural state as possible and provide areas of wildlife sanctuary and habitat preservation (City of Renton 2025). However, based on observations made during the site visit and a review of aerial imagery, this particular section of shoreline has been highly modified over the past several decades through agricultural use and the development of several roads and rail lines. Shoreline reaches to the immediate east, and designated as the Black River Riparian Forest and Wetland, appear to be more ecologically intact. In discussions with the City, it was determined that the light installation would likely be considered a maintenance activity, necessary for the safety of the park users, and therefore would be permitted under a shoreline exemption per RMC 4-9-190.C. The SMP also states that the light would be exempt from critical areas review as exemptions in the City’s CAO, including those for maintenance activities per RMC 4-3-050C.3 (Footnotes 14 and 15), are adopted by reference per RMC 4-3-090D.2c; and therefore also apply to critical areas in the shoreline. A shoreline exemption does not exempt the project from having to comply with the City’s SMP. Instead, a shoreline exemption allows projects that are considered King County Climate Equity Solar Project – City of Renton 7 to be small-scale and/or have minimal environmental impacts, to be constructed without a formal shoreline substantial development permit. Additionally, per RMC 4-3-090D.2.a.i, “development in the shoreline shall be carried out in a manner that prevents or mitigates adverse impacts to ensure no net loss of ecological functions and processes.” No loss of ecological function of the shoreline is anticipated as a result of the light installation. The light will be installed in an area of shoreline that is unvegetated, dominated by fill, and immediately adjacent to the paved trail. In its current state, this area of shoreline provides little to no shoreline function, and the addition of the 2-foot radius concrete footing would not result in a significant loss of shoreline ecological function. Therefore, no mitigation is proposed. Photo 2. Proposed location of light at Lake to Sound Trail at BNSF Railway Crossing King County Climate Equity Solar Project – City of Renton 8 Site 3: Eastrail Regional Trail at N. 41st Street King County DNRP is proposing to install one light along the Eastrail Regional Trail at the N. 41st Street crossing, on the northeast side of the trail (King County Tax Parcel 3224059005) (Figure 4). Mapped Critical Areas No wetlands are mapped as occurring in the immediate vicinity of the location of the proposed light. The closest wetland is mapped by the City’s COR Maps, which show one wetland, approximately 180 feet northeast of the site, on the east side of Lake Washington Boulevard. One stream, May Creek, is mapped as crossing under the Eastrail Regional Trail approximately 310 feet north of the proposed light location. The stream flows southeast to northwest under the trail, before flowing to the south, where it flows past the project area at a distance of approximately 130 feet. May Creek then continues to flow south and eventually into Lake Washington, approximately 1,000 feet southwest of the project area. This reach of May Creek is designated as a shoreline of the state (Type S), and is also a fish-bearing stream (Type F). According to SWIFD mapping, this reach of May Creek has documented use of several salmonid species including steelhead trout, sockeye salmon, coho salmon, Chinook salmon, and cutthroat trout. Results of Field Assessment Wetlands Three wetlands were observed within 200 feet of the location of the proposed light at the N. 41st Street crossing of the Eastrail Regional Trail. Wetlands A and B are depressional PFO wetlands. Wetland A is located approximately 45 feet northwest of the proposed light and Wetland B is located approximately 95 feet southwest of the proposed light, on the south side of N. 41st Street. Both wetlands are dominated by an overstory of black cottonwood trees. Soft rush and reed canarygrass dominate the understory of Wetland A and Wetland B, respectively. No active hydrology was observed during the April 30, 2025 site visit; however, water stained leaves were observed in both wetlands indicating hydrology. Hydrological inputs are primarily precipitation and stormwater runoff from the adjacent trail and roads. The wetland mapped by the City’s COR Maps on the southeast side of Lake Washington Blvd. N, was not accessible in the field and only observed from the right-of-way. This wetland appeared to be a depressional PFO wetland dominated by black cottonwood and is located at the toe of a slope. No hydrology was observed; however, likely hydrologic inputs include precipitation, a high groundwater table, and sheetflow from the adjacent hillside to the south. Using the Rating System, both Wetlands A and B scored a total of 19 points, classifying it as a Category III wetland. These wetlands provides a moderate function (7 points) for improving water quality because they have a high cover of persistent plants that can trap and filter pollutants. They are also located adjacent to roads and other developed areas that produce excess pollutants. The wetlands also provide a high hydrological function (8 points) because they can detain floodwaters and runoff in an area that is highly developed. Wetlands A and B have a low habitat function (4 points) because they do not contain diverse and/or multi-structural vegetation and do not contain habitat features such as snags and logs. King County Climate Equity Solar Project – City of Renton 9 Offsite Wetland C scored 17 points, and is also classified as a Category III wetland. The wetland provides a moderate score (6 points) for water quality functions because it has a high cover of persistent vegetation that can aid in filtering pollutants. However, the contributing basin is largely undeveloped forest that does not produce an excess of pollutants. It also provides a moderate hydrologic function (6 points) because it is located upgradient of May Creek, where flooding issues have been documented downstream. Offsite Wetland C also provides a moderate habitat function (5 points) because it provides habitat features such as snags and downed wood and provides a forested corridor in a largely developed landscape that organisms can use for foraging and refuge. Streams One stream, May Creek, was observed during the site visit. The closest point to the stream from the proposed light is approximately 125 feet to the northwest. At this point, the stream is approximately 35 feet wide. The banks are dominated by native vegetation including black cottonwood and red alder (Alnus rubra). Snowberry (Symphoricarpos albus), creeping buttercup (Ranunculus repens), and reed canarygrass were also observed. No fish were observed during the site visit; however, the stream supports fish habitat due to its width and gradient. Regulatory Implications Wetlands Per RMC 4-3-050G.2, Category III wetlands with a low habitat function (Wetlands A and B) are required a 75-foot buffer and Category III wetlands with a low habitat function (Offsite Wetland C) are required a 100-foot buffer. However, per RMC 4-3-050G.2 (Footnote 6), “areas that are functionally and effectively disconnected from the wetland by a permanent road or other substantially developed surface of sufficient width and with use characteristics such that buffer functions are not provided shall not be counted toward the minimum buffer.” Therefore, the project will have no impacts to the buffers of Wetland B or Offsite Wetland C, which are separated from the proposed location of the light by roads, but will have an impact on the buffer of Wetland A. May Creek is a Type F stream and is required a 115-foot buffer per RMC 4-3-050G.2. However, the proposed location of the light is outside the buffer of May Creek. Additionally, May Creek is designated as a ‘shoreline of the state’ and is therefore regulated under the City’s SMP Regulations (RMC 4-3-090). Shoreline jurisdiction extends 200 feet landward of the OHWM of the river. The location of the proposed light is approximately 130 feet landward of the OHWM; and therefore, the project also requires review under the City’s SMP. According to COR mapping, the proposed light is located in the Shoreline Single Family Residential Overlay District. According to the City’s Comprehensive Plan, the purpose of this district is to accommodate residential development and appurtenant structures that are consistent with the City’s SMP (City of Renton 2025). In discussions with the City, it was determined that the light installation would likely be considered a maintenance activity, necessary for the safety of trail users, and therefore would be permitted under a shoreline exemption per RMC 4-9-190.C. The SMP also states that the light would be exempt from critical areas review as exemptions in the City’s CAO, including those for maintenance activities per RMC 4-3-050C.3 (Footnotes 14 and 15), are adopted by reference per RMC 4-3-090D.2c; and therefore also apply to critical areas in the shoreline. A shoreline exemption does not exempt the project from King County Climate Equity Solar Project – City of Renton 10 having to comply with the City’s SMP. Instead, a shoreline exemption allows projects that are considered to be small-scale and/or have minimal environmental impacts, to be constructed without a formal shoreline substantial development permit. Additionally, per RMC 4-3-090D.2.a.i, “development in the shoreline shall be carried out in a manner that prevents or mitigates adverse impacts to ensure no net loss of ecological functions and processes.” No loss of ecological function of the shoreline is anticipated as a result of the light installation. The area where the light is proposed is on the former railroad embankment (i.e. fill), primarily unvegetated, and provides minimal, if any, buffer function for Wetland A and/or overall shoreline ecological function. Therefore, no shoreline ecological function will be lost and no mitigation is proposed. Photo 3. Proposed location of light at Eastrail Regional Trail at N. 41st Street Site 4: Eastrail Regional Trail at Mountain View Avenue North King County DNRP is proposing to install one light along the Eastrail Regional Trail at the Mountain View Avenue North. crossing, on the northeast side of the trail (King County Tax Parcel #3124059004). King County Climate Equity Solar Project – City of Renton 11 Mapped Critical Areas No wetlands or streams are mapped as occurring within the vicinity of the proposed location of the light. However, Lake Washington, ‘a shoreline of statewide significance,’ is approximately 150 feet to the west. Results of Field Assessment One wetland was observed in a ditch adjacent to the trail, approximately 60 feet south of the proposed light location, on the south side of Mountain View Avenue North. The wetland is a depressional, PEM wetland that is dominated by reed canarygrass. Soils appeared to be saturated to the surface. Hydrological inputs are likely precipitation and stormwater runoff from the Eastrail Regional Trail and Lake Washington Boulevard North. Using the Rating System, the wetland south of the Mountain View Avenue North site scored a total of 16 points, classifying it as a Category III wetland. The wetland provides a moderate function (6 points) for improving water quality because it has a high cover of persistent plants and seasonally inundated, both features that can trap and filter pollutants. It is also adjacent to a road, which is a source of pollutants during rain events. The wetland also provides a moderate hydrological function (6 points) because it can detain floodwaters and runoff ; however, there are no issues with flooding downstream so this function is limited. The wetland has a low habitat function (4 points) because it does not contain diverse and/or multi-structural vegetation and does not contain habitat features such as snags and logs. Regulatory Implications Per RMC 4-3-050G.2, Category III wetlands with a moderate habitat function are required a 75-foot buffer. The proposed location of the light is approximately 60 feet north of the wetland; and therefore, would be within the wetland buffer. However, per RMC 4-3-050G.2 (Footnote 6), “areas that are functionally and effectively disconnected from the wetland by a permanent road or other substantially developed surface of sufficient width and with use characteristics such that buffer functions are not provided shall not be counted toward the minimum buffer.” The wetland buffer is intersected by Mountain View Avenue North, a heavily traveled, asphalt road that provides no buffer function. Therefore, the wetland buffer would end at the south side of the road and any impacts north of the road would be outside of the wetland boundary. Lake Washington is designated as a ‘shoreline of statewide significance’ and is therefore regulated under the City’s SMP Regulations (RMC 4-3-090). Shoreline jurisdiction extends 200 feet landward of the OHWM of the Lake. The location of the proposed light is approximately 150 feet landward of the OHWM; and therefore, the project also requires review under the City’s SMP (RMC 4-3-090) regulations. According to the City’s COR mapping, the proposed light is located in the Shoreline Single Family Residential Overlay District. According to the City’s Comprehensive Plan, the purpose of this district is to accommodate residential development and appurtenant structures that are consistent with the City’s SMP (City of Renton 2025). In discussions with the City, it was determined that the light installation would likely be considered a maintenance activity, necessary for the safety of trail users, and therefore would be permitted under a shoreline exemption per RMC 4-9-190.C. The SMP also states that the light would be exempt from critical areas review as exemptions in the City’s CAO, including those for maintenance activities per King County Climate Equity Solar Project – City of Renton 12 RMC 4-3-050C.3 (Footnotes 14 and 15), are adopted by reference per RMC 4-3-090D.2c; and therefore also apply to critical areas in the shoreline. A shoreline exemption does not exempt the project from having to comply with the City’s SMP. Instead, a shoreline exemption allows projects that are considered to be small-scale and/or have minimal environmental impacts, to be constructed without a formal shoreline substantial development permit. Additionally, per RMC 4-3-090D.2.a.i, “development in the shoreline shall be carried out in a manner that prevents or mitigates adverse impacts to ensure no net loss of ecological functions and processes.” No loss of ecological function of the shoreline is anticipated as a result of the light installation. The light will be installed in an area of shoreline that is part of the former railroad embankment (i.e., fill), dominated by rocks and immediately adjacent to the paved trail. In its current state, this area of shoreline is dominated by impervious surfaces and provides no shoreline ecological function. Therefore no shoreline function will be lost and no mitigation is proposed. Photo 4. Proposed location of light at Eastrail Regional Trail at Mountain View Avenue North King County Climate Equity Solar Project – City of Renton 13 References Anderson, P.S., Susan Meyer, Dr. Patricia Olsen, and Erik Stockdale. 2016. Determining the Ordinary High-Water Mark for Shoreline Management Act Compliance in Washington State. Ecology Publication no. 16-06-029. Department of Ecology, Olympia, WA. October 2016. Brinson, M.M. 1993. A Hydrogeomorphic Classification for Wetlands. URL: https://erdclibrary. URL: erdc.dren.mil/jspui/bitstream/11681/6483/1/TR-WRP-DE-4.pdf. Accessed: April 2025. City of Renton. 2025. City of Renton (COR) Map. 2025. URL: https://maps.rentonwa.gov/Html5viewer/Index.html?viewer=cormaps. Accessed April 2025. Corps (U.S. Army Corps of Engineers). 2010. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0). ERDC/EL TR-10-3. U.S. Army Engineer Research and Development Center, Vicksburg, MS. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. Publication #FWS/OBS-79/31. United States Department of the Interior, Fish and Wildlife Service, Office of Biological Services, Washington, D.C. Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y- 87-1. U.S. Army Engineer Waterways Experiment Station, Vicksburg, Mississippi. Hruby, T., and A. Yahnke. 2023. Washington State Wetland Rating System for Western Washington Version 2.0: 2014 Update. Publication #32-06-009. Washington Department of Ecology, Olympia, WA. King County. 2025. iMap – online mapping. URL: https://gismaps.kingcounty.gov/iMap/. Accessed: April 2025. King County. 2024. 2024 King County Comprehensive Plan. URL: https://kingcounty.gov/en/dept/executive/governance-leadership/performance-strategy- budget/regional-planning/king-county-comprehensive-plan/current-adopted-plan. Accessed May 2025. NRCS (Natural Resources Conservation Service). 2025. Web Soil Survey. URL: http://websoilsurvey.sc.egov.usda.gov/. Accessed: April 2024. NWIFC (Northwest Indian Fisheries Commission). 2025. Statewide Washington Integrated Fish Distribution (SWIFD). URL: https://geo.wa.gov/datasets/wdfw::statewide-washington-integrated- fish-distribution/explore. Accessed: April 2025. USFWS (U.S. Fish and Wildlife Service). 2025. National Wetlands Inventory Wetland Mapper. URL: https://www.fws.gov/wetlands/Data/Mapper.html. Accessed: April 2025. WDFW (Washington Department of Fish and Wildlife). 2025. Priority Habitats and Species (PHS) on the Web. URL: https://geodataservices.wdfw.wa.gov/hp/phs/. Accessed April 2025. Attachment 1: Figures Attachment 2: Additional Photos Wetland at Boulevard Lane Park near light, looking west Wetland at Boulevard Lane Park near light, looking north Unvegetated shoreline at Lake to Sound Trail and BNSF Crossing Wetland A at Eastrail Regional Trail and N 41st Street, looking north Wetland A at Eastrail Regional Trail and N 41st Street, looking south May Creek near Eastrail Regional Trail and N 41st Street Wetland at Eastrail Regional Trail and Mountain View Road, looking south (Source: Google Maps) Attachment 3: Preliminary Wetland Rating Forms 1. Category of wetland based on FUNCTIONS [ ] Category I - Total score = 23 - 27 [ ] Category II - Total score = 20 - 22 [X] Category III - Total score = 16 - 19 [ ] Category IV - Total score = 9 - 15 FUNCTION Improving Water Quality Hydrologic Habitat Site Potential M M L Landscape Potential M H M Value H H L Total Score Based on Ratings 7 8 4 19 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 2. Category based on SPECIAL CHARACTERISTICS of wetland CHARACTERISTIC CATEGORY Estuarine Wetland of High Conservation Value Bog Forested Coastal Lagoon Interdunal None of the above Not Applicable Wetland name or number: 41st St Crossing - Wetland A RATING SUMMARY - Western Washington Name of wetland (or ID#): 41st St Crossing - Wetland A Date of site visit: 05/19/2025 Rated By: Maggie Bradshaw Trained by Ecology? Yes [X] No [ ] Date of Training: 03/12/2021 HGM Class used for rating: Depressional Wetland has multiple HGM classes? Yes [X] No [ ] NOTE: Form is not complete without the figures requested (figures can be combined). Source of base aerial photo/map: OVERALL WETLAND CATEGORY: [Category III] (based on functions [X] or special characteristics [ ]) 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…1/12 Wetland name or number: 41st St Crossing - Wetland 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 Hydroperiods D 1.4, H 1.2 Location of outlet (can be added to map of hydroperiods)D 1.1, D 4.1 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 1km Polygon: Area that extends 1km 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)D 3.1, D 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web)D 3.3 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…2/12 Wetland name or number: 41st St Crossing - Wetland 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 What are the characteristics of surface water outflows from the wetland? Wetland has no surface water outlet.points = 3 Wetland has an intermittently flowing, or highly constricted, outlet.points = 2 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 1 Wetland is a flat depression whose outlet is a permanently flowing ditch.points = 1 Score: 3 D 1.2 Is the soil 2 in. below the surface a true clay or organic soil? Mapped as true clay or organic (muck or peat)points = 4 Soil texture identified as clay or organic in field points = 4 Soil texture identified as clay or organic by laboratory test points = 4 None of the above points = 0 Score: 0 D 1.3 What are the characteristics and distribution of persistent plants? Wetland has persistent, ungrazed, plants > 95% of area points = 5 Wetland has persistent, ungrazed, plants > 50% of area points = 3 Wetland has persistent, ungrazed plants > 10% of area points = 1 Wetland has persistent, ungrazed plants < 10% of area points = 0 Score: 5 D 1.4 What are the characteristics of seasonal ponding or inundation in the wetland area? Area seasonally ponded is > 50% total area of wetland points = 4 Area seasonally ponded is equal to or > 25% total area of wetland points = 2 Area seasonally ponded is < 25% total area of wetland points = 0 Score: 0 Total for D 1:8 Rating of Site Potential [ ] 12-16 = H [X] 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 points = 1 No points = 0 Score: 1 D 2.2 Is >10% of the area within 150ft of the wetland in land uses that generate pollutants in surface runoff? Yes points = 1 No points = 0 Score: 1 D 2.3 Are there septic systems within 250ft of the wetland? Yes points = 1 No points = 0 Score: 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? Yes points = 1 No points = 0 Score: 0 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…3/12 Wetland name or number: 41st St Crossing - Wetland A D 2.5 What are the other sources of pollutants coming into the wetland? Total for D 2:2 Rating of Landscape Potential [ ] 3-4 = H [X] 1-2 = 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 points = 1 No points = 0 Score: 1 D 3.2 Is the wetland in a basin or sub-basin where an aquatic resource is on the 303(d) list? Yes points = 1 No points = 0 Score: 1 D 3.3 Has the site been identified in a watershed or local plan as important for maintaining water quality? Yes points = 2 No points = 0 Score: 0 Total for D 3:2 Rating of Value [X] 2-4 = H [ ] 1 = M [ ] 0 = L Record the rating on the first page DEPRESSIONAL AND FLATS WETLANDS Hydrologic Functions - Indicators that the site functions to reduce flooding and stream degradtion D 4.0 Does the site have the potential to reduce flooding and erosion? D 4.1 What are the characteristics of surface water outflows from the wetland? Wetland has no surface water outlet.points = 4 Wetland has an intermittently flowing, or highly constricted, outlet.points = 2 Wetland is a flat depression whose outlet is a permanently flowing ditch.points = 1 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 0 Score: 4 D 4.2 What is the depth of storage during the wet periods? Marks of ponding are 3ft or more above the surface or bottom of the outlet.points = 7 Marks of ponding are between 2ft to <3ft from the surface or bottom of the outlet.points = 5 Marks of ponding are at least 0.5ft to <2ft from the surface or the bottom of the outlet.points = 3 The wetland is a "headwater" wetland.points = 3 The wetland is flat but has small depressions on the surface that trap water.points = 1 Marks of ponding are less than 0.5ft (6in).points = 0 Score: 0 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…4/12 Wetland name or number: 41st St Crossing - Wetland A D 4.3 What is the contribution of the wetland to storage in the watershed? The area of the basin is less than 10 times the area of the unit points = 5 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 Score: 3 Total for D 4:7 Rating of Site Potential [ ] 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 unit receive stormwater discharges? Yes points = 1 No points = 0 Score: 1 D 5.2 Is >10% of the area within 150 ft of the wetland in land uses that generate excess runoff? Yes points = 1 No points = 0 Score: 1 D 5.3 Is more than 25% of the contributing basin of the wetland covered with intensive human land uses? Yes points = 1 No points = 0 Score: 1 Total for D 5:3 Rating of Landscape Potential [X] 3 = H [ ] 1-2 = 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 Is the wetland in a landscape that has flooding problems? Flooding occurs in a sub-basin that is immediately down-gradient of the wetland.points = 2 Surface flooding problems are in a sub-basin farther down-gradient.points = 1 Flooding from groundwater is an issue in the basin.points = 1 The existing or potential outflow from the wetland is so constrained that water cannot reach areas that flood.points = 0 There are no problems with flooding downstream of the wetland.points = 0 Score: 2 D 6.2 Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan? Yes points = 2 No points = 0 Score: 0 Total for D 6:2 Rating of Value [X] 2-4 = H [ ] 1 = M [ ] 0 = L Record the rating on the first page 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…5/12 Wetland name or number: 41st St Crossing - Wetland A HABITAT FUNCTIONS These questions apply to wetlands of all HGM classes - Indicators that the site functions to provide important habitat H 1.0 Does the wetland have the potential to provide habitat for many species? H 1.1 What is the structure of the plant community? Aquatic Bed Emergent Scrub-shrub Forested Multiple strata within the Forested class (canopy, sub-canopy, shrubs, herbaceous, moss/ground cover) 4 structures or more points = 4 3 structures points = 2 2 structures points = 1 1 structure points = 0 No structures present points = 0 Score: 0 H 1.2 What are the hydroperiods that meet the size thresholds in the wetland? Permanently flooded or inundated Seasonally flooded or inundated Occasionally flooded or inundated Saturated only Permanently flowing stream or river in, or adjacent to, the wetland Seasonally flowing stream in, or adjacent to, the wetland Lake Fringe wetland Freshwater Tidal wetland 4 or more types present points = 3 3 types present or Lake Fringe / Freshwater Tidal Fringe points = 2 2 types present points = 1 1 type present points = 0 None present points = 0 Score: 1 H 1.3 What is the richness of the plant species in the wetland? >19 species points = 2 5-19 species points = 1 <5 species points = 0 Score: 1 ✔ ✔ ✔ 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…6/12 Wetland name or number: 41st St Crossing - Wetland A H 1.4 What is the interspersion of habitats? High points = 3 Moderate points = 2 Low points = 1 None points = 0 Score: 0 H 1.5 What are the special habitat features in the wetland? Large, downed, woody debris within the wetland (>4in diameter and 6ft long). Standing snags (dbh >4in) within the wetland Undercut banks are present for at least 6.6ft (2m) and/or overhanging plants extend at least 3.3ft (1m) over open water or a stream (or ditch) in, or contiguous with the wetland, for at least 33ft (10m) 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) At least 0.25ac 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) 6 habitats selected points = 6 5 habitats selected points = 5 4 habitats selected points = 4 3 habitats selected points = 3 2 habitats selected points = 2 1 habitat selected points = 1 No habitats selected points = 0 Score: 0 Total for H 1:2 Rating of Site Potential [ ] 15-18 = H [ ] 7-14 = M [X] 0-6 = L Record the rating on the first page H 2.0 Does the landscape have the potential to support habitat functions of the site? H 2.1 What is the percentage of accessible habitat within 1km of the wetland? >33% of 1km Polygon points = 3 20-33% of 1km Polygon points = 2 10-19% of 1km Polygon points = 1 <10% of 1km Polygon points = 0 Score: 0 H 2.2 What is the percentage of total habitat in a 1km polygon around the wetland? Total habitat is >50% of the Polygon points = 3 Total habitat is 10-50% of the Polygon and in 1-3 patches points = 2 Total habitat is 10-50% of the Polygon and in >3 patches points = 1 Total habitat is <10% of the Polygon points = 0 Score: 1 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…7/12 Wetland name or number: 41st St Crossing - Wetland A H 2.3 What is the land use intensity in the 1km polygon? 50% of the Polygon is high intensity land use points = -2 <50% of the Polygon is high intensity land use points = 0 Score: 0 Total for H 2:1 Rating of Landscape Potential [ ] 4-6 = H [X] 1-3 = M [ ] 0 = 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? Aspen Stands Biodiversity Areas and Corridors Herbaceous Balds Old-growth/Mature Forests Oregon White Oak Riparian Westside Prairie Fresh Deepwater Instream Nearshore (Coastal, Open Coast, Puget Sound) Caves Cliffs Snags and Logs Talus The following criteria automatically score 2 points: The wetland provides habitat for Threatened or Endangered species The wetland is mapped as a location for an individual WDFW priority species The wetland is a Wetland of High Conservation Value The wetland has been categorized as an important habitat site in a local plan The wetland has 3 or more WDFW priority habitats within 100m, or meets the criteria for societal value points = 2 The site has 1 or 2 WDFW priority habitats within 100m points = 1 The site does not meet any of the criteria for societal value points = 0 Score: 0 Total for H 3:0 Rating of Value [ ] 2 = H [ ] 1 = M [X] 0 = L Record the rating on the first page 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…8/12 Wetland name or number: 41st St Crossing - Wetland A CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS SC 1.0 Estuarine Wetlands SC 1.1 Does the wetland meet all of the following criteria for Estuarine wetlands? The dominant water regime is tidal The wetland is vegetated The water salinity is greater than 0.5 ppt Yes - Go to SC 1.2 No - Not an Estuarine Wetland Result: Not an Estuarine Wetland SC 1.2 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 Estuarine Wetland No - Go to SC 1.3 Result: SC 1.3 Is the wetland unit at least 1ac 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. At least 75% of the landward edge of the wetland has a 100ft 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 contiguous freshwater wetlands. Yes - Category I Estuarine Wetland No - Category II Estuarine Wetland Result: SC 2.0 Wetlands of High Conservation Value SC 2.1 Does the wetland overlap with any known or historical rare plant or rare & high-quality ecosystem polygons on the WNHP Data Explorer? Yes - Category I Wetland of High Conservation Value No - Go to SC 2.2 Result: Go to SC 2.2 SC 2.2 Does the wetland have a rare plant species, rare plant community, or high-quality common plant community that may qualify the site as a WHCV? Yes - Category I Wetland of High Conservation Value No - Not a Wetland of High Conservation Value Result: 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wetl…9/12 Wetland name or number: 41st St Crossing - Wetland A SC 3.0 Bogs SC 3.1 Does an area within the wetland unit have organic soil horizons, either peats or mucks, that compose 16in or more of the first 32in of the soil profile? Yes - Go to SC 3.3 No - Go to SC 3.2 Result: Go to SC 3.2 SC 3.2 Does an area within the wetland unit have organic soils, either peats or mucks, 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 - Not a Bog Wetland Result: SC 3.3 Does an area with peats or mucks have more than 70% cover of mosses at ground level, AND at least 30% cover of plant species listed in the table provided in the instructions? Yes - Category I Bog Wetland No - Go to SC 3.4 Result: 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 combinations of species) listed in the table found in the instructions provide more than 30% of the cover under the canopy? Yes - Category I Bog Wetland No - Not a Bog Wetland Result: SC 4.0 Forested Wetlands SC 4.1 Does the wetland have at least 1 contiguous acre of forest that meets one of the following criteria? Old-growth forests Mature forests Yes - Category I Forested Wetland No - Not a Forested Wetland Result: Not a Forested Wetland 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wet…10/12 Wetland name or number: 41st St Crossing - Wetland A SC 5.0 Wetlands in Coastal Lagoons SC 5.1 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 rocks The depression 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 open water area (measured near the bottom) The lagoon retains some of its surface water at low tide during spring tides Yes - Go to SC 5.2 No - Not a Coastal Lagoon Wetland Result: Not a Coastal Lagoon Wetland SC 5.2 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). At least 75% of the landward edge of the wetland has a 100ft buffer of shrub, forest, or un- grazed or un-mowed grassland. the wetland is larger than 0.10ac (4350 sqft) Yes - Category I Coastal Lagoon No - Category II Coastal Lagoon Result: SC 6.0 Interdunal Wetlands SC 6.1 Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership WBUO)? Yes - Go to SC 6.2 No - Not an Interdunal Wetland Result: Not an Interdunal Wetland SC 6.2 Is the wetland 1ac or larger in size, or a mosaic that is 1ac or larger in size? Wetland is larger than 1ac in size - Go to SC 6.3 Wetland is a mosaic larger than 1ac is size - Category II Interdunal Wetland No - Go to SC 6.4 Result: SC 6.3 Does the wetland score 8 or 9 points for the habitat functions? Yes - Category I Interdunal Wetland No - Category II Interdunal Wetland Result: SC 6.4 Is the wetland unit between 0.1ac and 1ac, or in a mosaic of wetlands that is between 0.1ac and 1ac in size? Yes - Category III Interdunal Wetland No - Category IV Interdunal Wetland Result: 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wet…11/12 Wetland name or number: 41st St Crossing - Wetland A Category of wetland based on Special Characteristics If you answered No for all types, enter "Not Applicable" on Summary Form Final Category: Not Applicable 5/27/25, 2:54 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3380&WetlandName=41st St Crossing - Wetland A&Wet…12/12 1. Category of wetland based on FUNCTIONS [ ] Category I - Total score = 23 - 27 [ ] Category II - Total score = 20 - 22 [X] Category III - Total score = 16 - 19 [ ] Category IV - Total score = 9 - 15 FUNCTION Improving Water Quality Hydrologic Habitat Site Potential M M L Landscape Potential M H M Value H H L Total Score Based on Ratings 7 8 4 19 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 2. Category based on SPECIAL CHARACTERISTICS of wetland CHARACTERISTIC CATEGORY Estuarine Wetland of High Conservation Value Bog Forested Coastal Lagoon Interdunal None of the above Not Applicable Wetland name or number: 41st St - Wetland B RATING SUMMARY - Western Washington Name of wetland (or ID#): 41st St - Wetland B Date of site visit: 05/19/2025 Rated By: Maggie Bradshaw Trained by Ecology? Yes [X] No [ ] Date of Training: 03/12/2021 HGM Class used for rating: Depressional Wetland has multiple HGM classes? Yes [ ] No [X] NOTE: Form is not complete without the figures requested (figures can be combined). Source of base aerial photo/map: OVERALL WETLAND CATEGORY: [Category III] (based on functions [X] or special characteristics [ ]) 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…1/12 Wetland name or number: 41st St - Wetland B 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 Hydroperiods D 1.4, H 1.2 Location of outlet (can be added to map of hydroperiods)D 1.1, D 4.1 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 1km Polygon: Area that extends 1km 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)D 3.1, D 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web)D 3.3 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…2/12 Wetland name or number: 41st St - Wetland B 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 What are the characteristics of surface water outflows from the wetland? Wetland has no surface water outlet.points = 3 Wetland has an intermittently flowing, or highly constricted, outlet.points = 2 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 1 Wetland is a flat depression whose outlet is a permanently flowing ditch.points = 1 Score: 3 D 1.2 Is the soil 2 in. below the surface a true clay or organic soil? Mapped as true clay or organic (muck or peat)points = 4 Soil texture identified as clay or organic in field points = 4 Soil texture identified as clay or organic by laboratory test points = 4 None of the above points = 0 Score: 0 D 1.3 What are the characteristics and distribution of persistent plants? Wetland has persistent, ungrazed, plants > 95% of area points = 5 Wetland has persistent, ungrazed, plants > 50% of area points = 3 Wetland has persistent, ungrazed plants > 10% of area points = 1 Wetland has persistent, ungrazed plants < 10% of area points = 0 Score: 5 D 1.4 What are the characteristics of seasonal ponding or inundation in the wetland area? Area seasonally ponded is > 50% total area of wetland points = 4 Area seasonally ponded is equal to or > 25% total area of wetland points = 2 Area seasonally ponded is < 25% total area of wetland points = 0 Score: 0 Total for D 1:8 Rating of Site Potential [ ] 12-16 = H [X] 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 points = 1 No points = 0 Score: 1 D 2.2 Is >10% of the area within 150ft of the wetland in land uses that generate pollutants in surface runoff? Yes points = 1 No points = 0 Score: 1 D 2.3 Are there septic systems within 250ft of the wetland? Yes points = 1 No points = 0 Score: 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? Yes points = 1 No points = 0 Score: 0 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…3/12 Wetland name or number: 41st St - Wetland B D 2.5 What are the other sources of pollutants coming into the wetland? Total for D 2:2 Rating of Landscape Potential [ ] 3-4 = H [X] 1-2 = 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 points = 1 No points = 0 Score: 1 D 3.2 Is the wetland in a basin or sub-basin where an aquatic resource is on the 303(d) list? Yes points = 1 No points = 0 Score: 1 D 3.3 Has the site been identified in a watershed or local plan as important for maintaining water quality? Yes points = 2 No points = 0 Score: 0 Total for D 3:2 Rating of Value [X] 2-4 = H [ ] 1 = M [ ] 0 = L Record the rating on the first page DEPRESSIONAL AND FLATS WETLANDS Hydrologic Functions - Indicators that the site functions to reduce flooding and stream degradtion D 4.0 Does the site have the potential to reduce flooding and erosion? D 4.1 What are the characteristics of surface water outflows from the wetland? Wetland has no surface water outlet.points = 4 Wetland has an intermittently flowing, or highly constricted, outlet.points = 2 Wetland is a flat depression whose outlet is a permanently flowing ditch.points = 1 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 0 Score: 4 D 4.2 What is the depth of storage during the wet periods? Marks of ponding are 3ft or more above the surface or bottom of the outlet.points = 7 Marks of ponding are between 2ft to <3ft from the surface or bottom of the outlet.points = 5 Marks of ponding are at least 0.5ft to <2ft from the surface or the bottom of the outlet.points = 3 The wetland is a "headwater" wetland.points = 3 The wetland is flat but has small depressions on the surface that trap water.points = 1 Marks of ponding are less than 0.5ft (6in).points = 0 Score: 0 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…4/12 Wetland name or number: 41st St - Wetland B D 4.3 What is the contribution of the wetland to storage in the watershed? The area of the basin is less than 10 times the area of the unit points = 5 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 Score: 5 Total for D 4:9 Rating of Site Potential [ ] 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 unit receive stormwater discharges? Yes points = 1 No points = 0 Score: 1 D 5.2 Is >10% of the area within 150 ft of the wetland in land uses that generate excess runoff? Yes points = 1 No points = 0 Score: 1 D 5.3 Is more than 25% of the contributing basin of the wetland covered with intensive human land uses? Yes points = 1 No points = 0 Score: 1 Total for D 5:3 Rating of Landscape Potential [X] 3 = H [ ] 1-2 = 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 Is the wetland in a landscape that has flooding problems? Flooding occurs in a sub-basin that is immediately down-gradient of the wetland.points = 2 Surface flooding problems are in a sub-basin farther down-gradient.points = 1 Flooding from groundwater is an issue in the basin.points = 1 The existing or potential outflow from the wetland is so constrained that water cannot reach areas that flood.points = 0 There are no problems with flooding downstream of the wetland.points = 0 Score: 2 D 6.2 Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan? Yes points = 2 No points = 0 Score: 0 Total for D 6:2 Rating of Value [X] 2-4 = H [ ] 1 = M [ ] 0 = L Record the rating on the first page 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…5/12 Wetland name or number: 41st St - Wetland B HABITAT FUNCTIONS These questions apply to wetlands of all HGM classes - Indicators that the site functions to provide important habitat H 1.0 Does the wetland have the potential to provide habitat for many species? H 1.1 What is the structure of the plant community? Aquatic Bed Emergent Scrub-shrub Forested Multiple strata within the Forested class (canopy, sub-canopy, shrubs, herbaceous, moss/ground cover) 4 structures or more points = 4 3 structures points = 2 2 structures points = 1 1 structure points = 0 No structures present points = 0 Score: 0 H 1.2 What are the hydroperiods that meet the size thresholds in the wetland? Permanently flooded or inundated Seasonally flooded or inundated Occasionally flooded or inundated Saturated only Permanently flowing stream or river in, or adjacent to, the wetland Seasonally flowing stream in, or adjacent to, the wetland Lake Fringe wetland Freshwater Tidal wetland 4 or more types present points = 3 3 types present or Lake Fringe / Freshwater Tidal Fringe points = 2 2 types present points = 1 1 type present points = 0 None present points = 0 Score: 1 H 1.3 What is the richness of the plant species in the wetland? >19 species points = 2 5-19 species points = 1 <5 species points = 0 Score: 1 ✔ ✔ ✔ 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…6/12 Wetland name or number: 41st St - Wetland B H 1.4 What is the interspersion of habitats? High points = 3 Moderate points = 2 Low points = 1 None points = 0 Score: 0 H 1.5 What are the special habitat features in the wetland? Large, downed, woody debris within the wetland (>4in diameter and 6ft long). Standing snags (dbh >4in) within the wetland Undercut banks are present for at least 6.6ft (2m) and/or overhanging plants extend at least 3.3ft (1m) over open water or a stream (or ditch) in, or contiguous with the wetland, for at least 33ft (10m) 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) At least 0.25ac 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) 6 habitats selected points = 6 5 habitats selected points = 5 4 habitats selected points = 4 3 habitats selected points = 3 2 habitats selected points = 2 1 habitat selected points = 1 No habitats selected points = 0 Score: 0 Total for H 1:2 Rating of Site Potential [ ] 15-18 = H [ ] 7-14 = M [X] 0-6 = L Record the rating on the first page H 2.0 Does the landscape have the potential to support habitat functions of the site? H 2.1 What is the percentage of accessible habitat within 1km of the wetland? >33% of 1km Polygon points = 3 20-33% of 1km Polygon points = 2 10-19% of 1km Polygon points = 1 <10% of 1km Polygon points = 0 Score: 0 H 2.2 What is the percentage of total habitat in a 1km polygon around the wetland? Total habitat is >50% of the Polygon points = 3 Total habitat is 10-50% of the Polygon and in 1-3 patches points = 2 Total habitat is 10-50% of the Polygon and in >3 patches points = 1 Total habitat is <10% of the Polygon points = 0 Score: 1 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…7/12 Wetland name or number: 41st St - Wetland B H 2.3 What is the land use intensity in the 1km polygon? 50% of the Polygon is high intensity land use points = -2 <50% of the Polygon is high intensity land use points = 0 Score: 0 Total for H 2:1 Rating of Landscape Potential [ ] 4-6 = H [X] 1-3 = M [ ] 0 = 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? Aspen Stands Biodiversity Areas and Corridors Herbaceous Balds Old-growth/Mature Forests Oregon White Oak Riparian Westside Prairie Fresh Deepwater Instream Nearshore (Coastal, Open Coast, Puget Sound) Caves Cliffs Snags and Logs Talus The following criteria automatically score 2 points: The wetland provides habitat for Threatened or Endangered species The wetland is mapped as a location for an individual WDFW priority species The wetland is a Wetland of High Conservation Value The wetland has been categorized as an important habitat site in a local plan The wetland has 3 or more WDFW priority habitats within 100m, or meets the criteria for societal value points = 2 The site has 1 or 2 WDFW priority habitats within 100m points = 1 The site does not meet any of the criteria for societal value points = 0 Score: 0 Total for H 3:0 Rating of Value [ ] 2 = H [ ] 1 = M [X] 0 = L Record the rating on the first page 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…8/12 Wetland name or number: 41st St - Wetland B CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS SC 1.0 Estuarine Wetlands SC 1.1 Does the wetland meet all of the following criteria for Estuarine wetlands? The dominant water regime is tidal The wetland is vegetated The water salinity is greater than 0.5 ppt Yes - Go to SC 1.2 No - Not an Estuarine Wetland Result: Not an Estuarine Wetland SC 1.2 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 Estuarine Wetland No - Go to SC 1.3 Result: SC 1.3 Is the wetland unit at least 1ac 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. At least 75% of the landward edge of the wetland has a 100ft 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 contiguous freshwater wetlands. Yes - Category I Estuarine Wetland No - Category II Estuarine Wetland Result: SC 2.0 Wetlands of High Conservation Value SC 2.1 Does the wetland overlap with any known or historical rare plant or rare & high-quality ecosystem polygons on the WNHP Data Explorer? Yes - Category I Wetland of High Conservation Value No - Go to SC 2.2 Result: Go to SC 2.2 SC 2.2 Does the wetland have a rare plant species, rare plant community, or high-quality common plant community that may qualify the site as a WHCV? Yes - Category I Wetland of High Conservation Value No - Not a Wetland of High Conservation Value Result: 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType=…9/12 Wetland name or number: 41st St - Wetland B SC 3.0 Bogs SC 3.1 Does an area within the wetland unit have organic soil horizons, either peats or mucks, that compose 16in or more of the first 32in of the soil profile? Yes - Go to SC 3.3 No - Go to SC 3.2 Result: Go to SC 3.2 SC 3.2 Does an area within the wetland unit have organic soils, either peats or mucks, 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 - Not a Bog Wetland Result: Not a Bog Wetland SC 3.3 Does an area with peats or mucks have more than 70% cover of mosses at ground level, AND at least 30% cover of plant species listed in the table provided in the instructions? Yes - Category I Bog Wetland No - Go to SC 3.4 Result: 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 combinations of species) listed in the table found in the instructions provide more than 30% of the cover under the canopy? Yes - Category I Bog Wetland No - Not a Bog Wetland Result: SC 4.0 Forested Wetlands SC 4.1 Does the wetland have at least 1 contiguous acre of forest that meets one of the following criteria? Old-growth forests Mature forests Yes - Category I Forested Wetland No - Not a Forested Wetland Result: Not a Forested Wetland 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType…10/12 Wetland name or number: 41st St - Wetland B SC 5.0 Wetlands in Coastal Lagoons SC 5.1 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 rocks The depression 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 open water area (measured near the bottom) The lagoon retains some of its surface water at low tide during spring tides Yes - Go to SC 5.2 No - Not a Coastal Lagoon Wetland Result: Not a Coastal Lagoon Wetland SC 5.2 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). At least 75% of the landward edge of the wetland has a 100ft buffer of shrub, forest, or un- grazed or un-mowed grassland. the wetland is larger than 0.10ac (4350 sqft) Yes - Category I Coastal Lagoon No - Category II Coastal Lagoon Result: SC 6.0 Interdunal Wetlands SC 6.1 Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership WBUO)? Yes - Go to SC 6.2 No - Not an Interdunal Wetland Result: Not an Interdunal Wetland SC 6.2 Is the wetland 1ac or larger in size, or a mosaic that is 1ac or larger in size? Wetland is larger than 1ac in size - Go to SC 6.3 Wetland is a mosaic larger than 1ac is size - Category II Interdunal Wetland No - Go to SC 6.4 Result: SC 6.3 Does the wetland score 8 or 9 points for the habitat functions? Yes - Category I Interdunal Wetland No - Category II Interdunal Wetland Result: SC 6.4 Is the wetland unit between 0.1ac and 1ac, or in a mosaic of wetlands that is between 0.1ac and 1ac in size? Yes - Category III Interdunal Wetland No - Category IV Interdunal Wetland Result: 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType…11/12 Wetland name or number: 41st St - Wetland B Category of wetland based on Special Characteristics If you answered No for all types, enter "Not Applicable" on Summary Form Final Category: Not Applicable 5/27/25, 2:55 PM Wetland Rating Summary https://secureaccess.wa.gov/ecy/wetlandsratingtool/WATOR/WetlandSummary?WetlandId=3381&WetlandName=41st St - Wetland B&WetlandType…12/12