1125 80TH ST SW 2016-01-01 MF Import

c) a baffle-type oil/water separator followed by a vegetated Swale, both designed and constructed according to City standards. If an infiltration basin is not constructed for treatment of stormwater, a portion of the building rooftop runoff shall be routed to roof downspout systems designed and constructed to City standards, if suitable soils exist on the site. The portion of the roof runoff routed to these systems shall be designed so that the volume of water infiltrating into the ground on the site after development matches, as closely as is feasible, the volume of water infiltrating into the ground under existing conditions. 20.No stormwater facilities, with the exception of necessary discharge systems, may be located inside wetland or stream buffer areas. Natural wetlands may not be used to meet detention requirements for stormwater. 21. If the future use of the site will result in the potential for accidental spills of chemicals, including oils or furls, to the City's sanitary sewer, an Accidental Spill Prevention Plan will be required per the direction of the Industrial Pretreatment Program. 22. All chemicals or products of a hazardous or toxic nature that may be used or stored on the site must be stored under cover and isolated from the storm drainage system. 23. A special area shall be designed and constructed if steam cleaning or washing of equipment or vehicles will occur on this site. The area shall be covered, paved with Portland cement concrete, hydrologically isolated from the rest of the site and the storm drainage system, and shall discharge to the sanitary sewer through a baffle-type oil/water separator. A discharge authorization from the City's industrial Pretreatment Program may be required for the connection to the sanitary sewer. 24. Locations of any drainage facilities near steep slopes w;ll require detailed geotechnical analysis and design that documents and ensures their safety. 25. Any Petroleum product transfer areas shall be designed to prevent spills from entering the storm drainage system. If located outside, the transfer area shall meet the following requirements: a) The transfer area shall be graded to prevent run-on of stormwater runoff from adjacent areas. b) Trench or valley drains shall be placed and designed to route any runoff or spills through a spill containment structure. c) The spill containment structure shall discharge to the storm drainage system unless the transfer area is under cover. 5