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STORMWATER SITE PLAN <br />COMPASS HEALTH SUPPORTIVE HOUSING <br />NOVEMBER 7, 2019 <br />PAGE 5 <br />BMP C123, Clear Plastic Covering: <br />This involves covering a bare area with clear plastic that protect it from erosion from <br />rainfall. This BMP will be used on this site to provide cover of temporary stockpiles. <br />Element #6: Protect Slopes <br />Slopes will be stabilized with the cover practices above. Any slopes steeper than 3:1 will be <br />walls. <br />Element #7: Protect Drain Inlets <br />The catchbasins along 33`d Street and the alley that will be subject to potential runoff from the <br />disturbed areas will be protected with filter inserts. <br />BMP C220, Storm Drain Inlet Protection: <br />During construction, filter inserts will be installed in the existing inlets surrounding the <br />site and in the new inlets. They will filter and retain sediment from dirty stormwater <br />runoff during construction. <br />Element #8: Stabilize Channels and Outlets <br />There are no channels or outlets. <br />Element #9: Control of Pollutants <br />All pollutants, including waste materials and demolition debris, that occur onsite shall be <br />handled and disposed of in a manner that does not cause contamination of stormwater. Good <br />housekeeping and preventative measures will be taken to ensure that the site will be kept <br />clean, well organized, and free of debris. If required, BMPs to be implemented to control <br />specific sources of pollutants are discussed below. <br />Vehicles, construction equipment, and/or petroleum product storage/dispensing: <br />• All vehicles, equipment, and petroleum product storage/dispensing areas will be <br />inspected regularly to detect any leaks or spills, and to identify maintenance needs to <br />prevent leaks or spills. <br />• On -site fueling tanks and petroleum product storage containers shall include <br />secondary containment. <br />• Spill prevention measures, such as drip pans, will be used when conducting <br />maintenance and repair of vehicles or equipment. <br />• In order to perform emergency repairs on site, temporary plastic will be placed <br />beneath and, if raining, over the vehicle. <br />• Contaminated surfaces shall be cleaned immediately following any discharge or <br />spill incident. <br />Chemical storage: <br />• Any chemicals stored in the construction areas will conform to the appropriate <br />source control BMPs listed in Volume IV of the Ecology Stormwater Manual. In Western <br />WA, all chemicals shall have cover, containment, and protection provided on site, per <br />P:\Work\Projects\2017\17-125 Environmental Works\CE\DOCS\Final SSP 17-1_25.doc <br />