6301 36TH AVE W 2016-11-01 - Laserfiche WebLink

10. Project proponents should try to retain topsoil on sites to the maximum extent feasible. (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 may be 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. The following Best Management Practices(BMPs)must be followed for all construction work through and nnmediately adjacent to environmentally sensitive areas and their buffers,unless otherwise required by a permit issued by a federal or state agency. • Work should be done in the dry season whenever possible(June 15 to September 15). • The width of the corridor through the wetland or stream(buffer)should be minimized. • Construction staging areas must be located outside of environmentally sensitive areas and their buffers, unless determined by the Planning Director to be infeasible. Streams,wetlands,buffers,staging areas and construction limits shall be clearly shown on construction plans. Construction limits shall be clearly marked in the field with orange construction fencing. • Work shall be done so as to minimize turbidity,erosion,and other water quality impacts. • Proper erosion and sediment control measures shall be followed to prevent sediments from entering creeks or wetlands. Erosion control measures shall be approved by the Department of Engineering and Public Services and/or agencies with jurisdiction. Measures may include,but not be limited to,placing plywood across the area where equipment will operate;mulching the wetland areas where equipment will operate; placing wood chips atop a flexible mat to help prevent compaction (the wood chips and mat must be removed following construction);placing silt fences and hay bales between construction areas and all adjacent wetlands and streams;and placing ecology blocks between construction areas and streams or wetlands when a temporary fill is used for roads,etc. • Erosion control measures shall be in place and inspected prior to commencement of work. All erosion control structures shall be inspected regularly to ensure they are maintained in working order. • If the corridor needs to be dewatered to do the work,the water should be pumped to a sedimentation pond where all solids can settle or an area where it can sheet flow before being discharged back to the stream or wetland. Turbidity levels in associated wetlands and streams shall not exceed the standards in WAC 173- 201A.