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4 i i1 <br /> August 9, 1989 <br /> 0 y�f,F <br /> S�� <br /> Mr. Patrick Craig <br /> 1133 Bristol Avenue <br /> Stockton, CA 95204 <br /> Re: Former Service Station No. 9-4054 <br /> 2103 Country Club, Stockton, California <br /> Dear Mr..Craig: <br /> This letter is written to respond to your request that Chevron accepts responsibility <br /> for the investigation and cleanup of underground gasoline contamination at the <br /> captioned former service station site. <br /> As your know, our dealer's lease terminated June 30, 1986, and Chevron terminated <br /> the ground lease on February 1, 1987. Since the facilities were lessor built and <br /> owned, and you declined Chevron's offer to remove the underground storage tanks, <br /> the facilities, including tanks, were left in place,and operated by another dealer after <br /> Chevron left the site. <br /> Our records indicate that the underground tanks were tight before Chevron left the <br /> site. Although subsurface investigation did indicate some minor levels of <br /> contamination, the probability is that the source of the problem was the service <br /> station across the street from your property. <br /> Further,the levels of contamination increased dramatically after Chevron had left the y <br /> site. Soil contamination levels increased from 4.1 parts per million - which is below <br /> the action levels in California's"Leaking Underground Fuel Tank"guidance manual - <br /> to 11,000 parts per million. In November of 1986 no free phase product was present <br /> in the down gradient well. The ground water monitoring conducted in August of <br /> 1988 shows over four inches of free floating product in the down gradient well. <br /> Those data suggest very strongly that either migration from offsite had drastically <br /> increased, or that one or more of the tanks suffered a major leak after the November, <br /> 1986, sampling event. (See, Groundwater Technology, Inc. report of December 1, <br /> 1986.) <br /> For the above reasons, Chevron is unwilling to accept responsibility for cleanup of <br /> the contamination absent proof that its operations at the station were the cause of the <br /> contamination. <br /> Attached per your request are copies of the following environmental reports: <br /> • Groundwater Technology's subsurface assessment <br /> • The Risk Assessment report prepared by E A Engineering <br />