9815 EVERGREEN WAY 2016-01-01 MF Import

MEMORANDUM TO: Gordon Witcher FROM: Jane 'Limmerman DATE: November 19, 1991 SUBJECT: Goodman Auto Sales Plan Review, Oil/Water Separator Issues The oil/water separator serving the carwash area must not receive runoff from the surrounding area. It is not intended to treat stormwater runoff, just the wash water prior to discharge to the sanitary sewer. The wash area must be hydrologically isolated� from the rest of the site. As indicated on earlier mark-upc, the saparator is to be sized for the expected rate of discharge that will be usecl to wash cars. The size of the service and the expected water presGure can be used to determine the expected rate of flow. The newly submitted plans show the site divided into two sub-basins, basin A and basin B. All the runoff from the site must be routed through an oil/water separator prior to being dischargeZ from the site. The site should be altered, either by grading or installatior� of storm drain, to route all runoff to a common discharge point. The runoff would then be routed throuqh an oil/water separator sized for the entire site. If all the runoff from the site cannot be routed to a common discrarge point, then an oil/water separator for each sub- basin will be necessary in addition to the oil/water separator serving the carwash area. Per earlier comments, the oil/water separator(s) provided for stormwater runoff treatment must be equipped with coalescing plates.