12011 19TH AVE SE PARKING LOT 2021-12-23

• • STORMWATER SITE PLAN OCTOBER 23,2019 EMORYS ON SILVER LAKE PAGE 5 clean, well organized, and free of debris. If required, BMPs to be implemented to control specific sources of pollutants are discussed below. Vehicles,construction equipment,and/or petroleum product storage/dispensing: • All vehicles, equipment, and petroleum product storage/dispensing areas will be inspected regularly to detect any leaks or spills, and to identify maintenance needs to prevent leaks or spills. • On-site fueling tanks and petroleum product storage containers shall include secondary containment. • Spill prevention measures, such as drip pans, will be used when conducting maintenance and repair of vehicles or equipment. • In order to perform emergency repairs on site, temporary plastic will be placed beneath and, if raining, over the vehicle. • Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Chemical storage: • Any chemicals stored in the construction areas will conform to the appropriate source control BMPs listed in Volume IV of the Ecology Stormwater Manual. In Western WA, all chemicals shall have cover, containment, and protection provided on site, per BMP C153 for material delivery, storage and containment in the Surface Water Management Manual for Western Washington, 2012/14. • Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' recommendations for application procedures and rates shall be followed. Demolition: • Dust released from demolished sidewalks shall be controlled using dust control measures (BMP C140). • Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or debris will be protected using storm drain inlet protection (BMP C220 as indicated on the plan). • Process water and slurry resulting from sawcutting and surfacing operations will be prevented from entering the waters of the state by implementing sawcutting and surfacing pollution prevention measures (BMP C152). 1. Slurry and cutting shall be vacuumed during cutting and surfacing operations. 2. Slurry and cuttings shall not drain to any natural or constructed drainage conveyance. 3. Collected slurry and cuttings shall be disposed of in a manner that does not violate groundwater or surface water quality standards. P:\Work\Projects\2018\18-141 Emory's\CE\DOCS\Final SSP 18-141.doc