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1 <br /> During the period of October 1 through April 30, all disturbed soil areas will be covered or <br /> stabilized within 5 days or 24 hours when a major storm event is predicted. Cover measures may <br /> include mulching, netting, plastic sheeting, erosion control blankets, or free draining material. <br /> The extent of clearing shall be limited to the amount of land that can be covered or stabilized <br /> within 24 hours. <br /> Soil stockpiles shall be stabilized by plastic covering (BMP 123)or surrounded by filter fabric <br /> fence (BMP C233). The stockpiles shall be a minimum of 50 feet from critical areas, including <br /> wetland buffers and drainage swales. <br /> Dust control (BMP C140)will be provided by sprinkling the site with water. ' <br /> Permanent erosion control measures will include site paving and seeding of exposed soils. <br /> 8.6 Protect Slopes 1 <br /> Grading across the site will be minimal. If necessary, slopes across the site shall be stabilized <br /> with temporary and permanent seeding (BMP C120)to prevent erosion. Runoff shall be directed <br /> away from slopes by grading. <br /> 8.7 Protect Drain Inlets ' <br /> Storm drain inlets shall be protected so that surface water runoff does not enter the conveyance <br /> system without first being filtered. Inlets shall be inspected weekly, at a minimum,and daily <br /> during storm events. Storm Drain Inlet Protection (BMP C220)will be provided. 111 <br /> 8.8 Stabilize Channels and Outlets <br /> The project will use the existing storm system throughout construction and in the final condition. <br /> Existing channels and outlets will be maintained in their existing condition. No further BMPs are <br /> expected to be required for this element. <br /> 111 8.9 Control Pollutants <br /> The Contractor shall be responsible for controlling pollutants at the work site. Key elements, such <br /> as centralized areas for equipment and concrete truck washing and temporary storage of debris <br /> and other stockpiled materials, are the responsibility of the Contractor. <br /> All pollutants, including waste materials and demolition debris, that occur onsite shall be handled I <br /> and disposed of in a manner that does not cause contamination of stormwater. Woody debris <br /> may be chopped and spread onsite. <br /> Cover, containment, and protection from vandalism shall be provided for all chemicals, liquid I <br /> products, petroleum products, and non-inert wastes present on the site(see Chapter 173-304 <br /> WAC for the definition of inert waste). Onsite fueling tanks shall include secondary containment. <br /> Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system <br /> drain down, solvent and de-greasing cleaning operations,fuel tank drain down and removal, and <br /> other activities which may result in discharge or spillage of pollutants to the ground or into <br /> stormwater runoff must be conducted using spill prevention measures, such as drip pans. <br /> Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. <br /> Emergency repairs may be performed on-site using temporary plastic placed beneath and, if <br /> raining, over the vehicle. <br /> • <br /> Construction Storrnwater Pollution Prevention Plan <br /> The Bethany at Silver Lake 4 0111011 <br /> 2180406.10 <br />