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• ; : , PHONE 285-2400 CABLE ADDRESS:TIMOIL DEC 19aa SEATTLE T (FA X1206-283-8038 TACOMA e PORTLAND RENOKTON RO MOND `Z ' 2 TIME OIL' i PANY L08 ANGELES 9.3 E 8 4 7 6 5 2737 WEST COMMODORE WAY SEATTLE,WASHINGTON 98199-1233 PRODUCTS TI P.O. BOX 24447,TERMINAL STATION SEATTLE,WASHINGTON 98124-0447 TIME TESTED M November 30, 1988 City of Stockton Department of Municipal Utilities Attn: Mr. Robert J. Castelli 2500 Navy Drive Stockton, CA 95206 Dear Mr. Castelli : I am writing in response to your letter dated October 25, 1988 regarding Time Oil Co's permit to discharge water from our groundwater clean-up system at 3015 Navy Drive, Stockton. In that letter you advised us that it would be necessary to install a Lower Explosive Limit (LEL) monitor within 30 days. As I understand from our discussion yesterday afternoon, that requirement does not become effective until we actually begin to discharge. Groundwater is not presently being discharged to the sewer system. You will be advised when such a discharge begins. You requested that we detail changes made to our system and resubmit updated drawings. The original system pumped groundwater from wells numbered R1 through R5. These wells are located inside the dike surrounding our tanks. Water and recovered product was piped into the oil/water separator which discharges to the sanitary sewer. Water and any spilled product collected at the truck loading rack is also piped to the oil/water separator. Pumping from the "R" wells was discontinued in March of this year since no further product was being recovered. Pumping from these wells has not been resumed. Water samples were being collected, as required under our permit, up to the time pumping was discontinued. There have been no discharges from the oil/water separator since March. On February 25, 1988 Time Oil joined with our neighboring companies to investigate the appearance of gasoline along Navy Drive. As a part of that investigation, nine observation wells were dug by backhoe on our property (designated by a "T" prefix) . In order to recover gasoline found between Navy Drive and our dike wall , a gravel-filled trench ("french drain") was constructed connecting five of these wells. The purpose of the trench was to halt migration of the gasoline and enhance our ability to pump it from the wells. After monitoring product and water elevations for a period of time sufficient to identify any trends, air-operated pumps were installed in three of the wells (T1, T3 and T12) . The output from the pumps is piped to tank 609, which has a capacity of approximately 25,000 gallons. Tank 609 is connected to the oil/water separator via a pipe from the bottom of the tank to the top of the separator.