6101 ASSOCIATED BLVD BASE FILE 2017-06-05

3.3 Mitigation Measures Prior to Construction During Construction/Earthwork 1.__ Mining sites_must.comply with the Department of Natural Resources reclamation requirements. On sites with existing mined slopes which are not subject to DNR regulations,slopes must be remediated to 1.5 horizontal 1 vertical(1.51-1:1V), except for glacial till slopes which can be remediated to 1HAV slope if approved by a qualified geotechnical engineer. All remediated slopes must be covered with top soil material that will support vegetation,jute matting or equivalent;and be revegetated with hydroseed,groundcover and shrubs. (SEPA Earth and Water Policies) 2. Temporary slopes within native glacial soils shall be limited to a maximum angle of 1/2 foot horizontal(H)to 1 foot vertical(V). Temporary slopes within fill soils shall be limited to a maximum angle of 1H:1V. Temporary slopes must be covered with an impermeable membrane,such as visqueen or mulch, in order to prevent precipitation from coming in contact with the soils. (SEPA Earth and Water Policies) Permanent slopes steeper than 25%shall be designed by a professional civil or geotechnical engineer. The design should present appropriate erosion control measures which may include:hydroseeding,erosion control blankets,rip-rap,jute matting, and visqueen. (SEPA Earth and Water Policies) 3. Grading/filling must not adversely affect the hydrology of streams and existing or created wetlands. (SEPA Earth and Water Policies) 4. Grading/filling on-site shall not adversely affect adjoining sites. (SEPA Earth and Water Policies) Section 4: SURFACE/GROUNDWATER,PLANTS AND ANIMALS 4.1 Threshold If a priority species is mapped on or within 300 feet of a site or documented on the site by a qualified individual, additional SEPA review maybe required. This will require coordination with the Department of Fish and Wildlife to determine appropriate mitigation measures. These may include,but are not limited to,seasonal restriction on construction, provision of buffers,and preservation of existing vegetation. Note: If an endangered plant or wildlife species is found on a site prior to or during development,the developer must comply with all applicable federal,state,and local regulations,including preparation of habitat management plans. (The Subarea Plan preserves priority habitats as defined by the Department of Fish and Wildlife -urban natural open space,riparian corridors,and wetlands.) 4.3 Mitigation Measures 4.3.1 General Mitigation Measures 1. In conjunction with issuance of development permits for a site, a permanent fence must be constructed along the entire edge of any environmentally sensitive area buffer. The design of the fence must be split rail,or an alternative approved by the Planning Department prior to issuance of permits. ESA signs should be placed at approximately 50 foot intervals along the fence. Signs are available from the Planning and Community 5