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Chevron <br /> Chevron U.S.A. Inc. <br /> 2410 Camina Ramon, San Ramon, California • Phone 14151 842-9500 <br /> Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804 <br /> November 30, 1990 <br /> Marketing Operations <br /> D. Moller <br /> Manager,Operations <br /> S. L. Patterson <br /> Area Manager,Operations <br /> C. G.1-rimhach <br /> Manager,Engineering <br /> Mr. Steve Snyder <br /> San Joaquin County <br /> Environmental Health Services <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Former Chevron SS #9-7780 <br /> 3246 East Fremont Street <br /> Stockton, California <br /> Dear Mr. Snyder: <br /> This letter is in response to a letter dated October 15, 1990, sent to Chevron by Greg Lyon of San <br /> Joaquin County. This letter also serves to document phone conversations between yourself and Clint <br /> Rogers of Chevron on November 2, 1990, and between Jim Maughan of the Central Valley Regional <br /> Water Quality Control Board and Clint Rogers on November 2, 1990 and November 19, 1990. <br /> Each of the items in Mr. Lyon's letter are listed below and followed by clarifications agreed upon <br /> during the November 2, 1990 conversation between yourself and Mr.Rogers, with exception to items <br /> 1 and 2 which you referred to Jim Maughan. The clarifications for items 1 and 2 were agreed upon <br /> during the November 19, 1990 conversation between Mr. Maughan and Mr. Rogers, based on <br /> information provided by Chevron's consultant, EA Engineering, Science and Technology. <br /> 1. Collect water samples on a quarterly basis and provide us with written quarterly report. <br /> It was agreed that Chevron's consultant, Alton Geoscience, will begin an annual groundwater <br /> monitoring program in February, 1991. A written report will be prepared by Alton to describe the <br /> results of each annual monitoring, and copy of this report will be forwarded to the appropriate <br /> regulatory agencies by Chevron. <br /> 2. Install a third monitoring well screened in the same aquifer zone as EA-5 and EA-6 in order <br /> to determine groundwater gradient. Submit a work plan for this well by November 5, 1990. <br /> It was agreed that the installation of an additional monitoring well was unnecessary. It is probable <br /> that the gasoline contamination found in groundwater samples from MW-1, MW-2, and MW-3 in <br /> March, 1987 resulted from isolated and limited release due to operations at the former service station. <br /> After the station was abandoned in June, 1988, all soil and groundwater samples have shown no <br /> detectable gasoline contaminants. A severe drought in the area during the past four years has created <br /> conditions which favor the decrease of gasoline contamination in soil and groundwater. <br /> Enclosed with this letter is the conclusions section of a soil and groundwater investigation report <br /> prepared by Chevron's consultant,EA Engineering,Science,and Technology,dated September, 1990. <br /> Based on these conclusions and the information compiled in this report, it is Chevron's belief that <br /> there are no detectable gasoline contaminants present in the soil or groundwater at this site, there is <br /> no future threat of gasoline contamination of groundwater resulting from Chevron's past activities <br /> at this site, and there has been no migration of gasoline contaminants off the site. <br /> The annual monitoring program was agreed upon in order to provide analysis of groundwater in the <br /> event that the groundwater elevation was to return to previous levels where gasoline contamination <br /> was observed in samples. <br />