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HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment,Remedial Testing,Design and Operation August 25, 1998 Mr. Robert Sagaser, Environmental Controls Officer Utilities Department City of Tracy 3900 Holly Drive Tracy, California 95376 Subject: Results of Field Test for,Removal of Hydrocarbons from Extracted Groundwater prior to Discharge to Sanitary Sewer System Former Discovery Chevrolet 1615 West 11 th Street, Tracy, California Mr. Sagaser: At the request of our client, Ms. Michelle Nokes, Horizon Environmental Inc. (Horizon) has Cprepared this letter on the results of a field test for removal of hydrocarbons from extracted ' groundwater at the above-referenced site (Figure 1). As a part of recently completed. soil excavation operations at the site, Horizon extracted a volume of groundwater from the excavation prior to backfilling. The groundwater was extracted with the use of a trash pump, and is stored temporarily onsite in a rented aboveground storage tank(AST). LPrior to discharge into the sanitary sewer system, removal of hydrocarbons from the groundwater will be performed by carbon adsorption. After treatment by the carbon adsorption canister, the groundwater would then be discharged to the City of Tracy sanitary sewer system. It is our understanding that the discharged groundwater must have nondetectable laboratory results, and that your office must be in receipt of the laboratory results prior to discharge into the sanitary sewer system. On July 21 and August 12, Horizon prepared Request for Discharge letters to discharge groundwater into the Ci of Tracy racy sanitary sewer. On August 19, Horizon collected a representative water sample from the estimated 6,000 gallons of water stored in the AST at the site. On August 21, Horizon performed a field test by pumping approximately 50 gallons of the extracted water through a 200-pound granular-activated carbon canister. The treated water was collected in a 55-gallon drum, then pumped back into the AST. LEffluent water samples were collected in glass sample containers supplied by the laboratory and transported under chain of custody documentation to Kiff Analytical in Davis, California for analyses. The water samples were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg), and the volatile aromatics benzene, toluene, ethylbenzene, and xylenes (BTEX) by ✓ Environmental Protection Agency (EPA) Method 8015 (modified) and 8020. 5011 Golden Foothill Parkway,Suite 7 - EI Dorado Hills,CA 95762 • (916)939-2170 . FAX(916)939-2172 P.O.Box 5283 . Bakersfield,CA 93388 - (805)589-8389 . FAX(805)589-1456