11807 SILVER LAKE DR 2024-01-05 - Laserfiche WebLink

JULY2022 I STORMWATER SITE PLAN 10 PERTEET 4.0 OFF -SITE ANALYSIS An off site analysis was performed. This analysis Included an on -site and downstream assessment and is limited by the scope and fee of this project. Under the guidance of Ecology's Stormwater Management Manual (SW MM), an off -site analysis is optional but recommended. An off -site analysis shall assess apparent and potential impacts to downstream waters, including but not limited to: water quality, erosion, slope stability, and upstream conditions, and or run-on. In doing so, areas that may benefit from cournwater BMPs, water quality facilities, and or flow control facilities beyond what s required under the minimum requirements of the project can be identified. See Figure 1.0.1 in Section 1.0 for the Site Vicinity Map 4.1 Resource Review Based on the anticipated impact of this project and its proximity to the receiving water (Silver Lake) the off site analysis is limited and does not Include a complete and thorough review of all resources that may be available. The project is located within Section 19, Township 28N, Range 5E of the Willamette Meridian and is a linear trail within the public right-of-way along Silver Lake and through Sullivan Park in the City of Everett, Snohomish County, Washington State. The project is within Water Resource Inventory Area (WRIA) e8-Lake Washington - Cedar -Sommamish watershed. The project limits have historically been a park (5ullivan Park) or public right-of-way. According to the Washington Department of Fish and Wildlife, Silver Lake Includes stocked Rainbow Trout, Krouse, and Largemouth Bass and resident Rock Bass and Yellow Perch. The topography generally varies from rolling to flat as the project limits approach Silver Lake with steepest slopes approaching approximately 16% SERA and JARPA documentation indicated that a review of the US Fish and Wildlife Services Information for Planning and Consultation (IPi Washington Department of Fish and Wildlife Priority Habitat Species (PHS), and Washington Department of Natural Resources Natural Heritage Program (WNHP) revealed that no threatened or endangered species are known to be on or near the project locations. The project site has a shoreline master program designation of Urban Conservancy Recreation. One wetland is mapped in the wooded area on the west side of Silver Lake Road. The wetland is on the opposite side of the road approximately 240 feet from the project site. Silver Lake is listed on the Washington Department of Ecology's 303(d) list with the following: • Bacteria • Polychlonnoted Biphenyls(PCBs) SERA documentation indicates that: a review of the Washington Department of Ecology cleanup sites database revealed five sites within one-half mile from the project location. No hazmat sites are mapped to occur in the project location. Any potentially contaminated sails encountered during construction will be profiled and disposed