SITE INFORMATION AND CORRESPONDENCE

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Brown and CaldwL �� ro Consultants tl 723 S Street Sacramento California 95814-7092 (916)444-0123 FAX(916)444-8437 s April 10, 1990 Mr. John Welty California Tomato Growers Association, Inc. 9036 Thornton Road Stockton, California 95207 017-4946-0311 Subject: Data Evaluation Regarding Contamination at Property Adjacent to 9036 Thornton Road, Stockton, California Dear Mr. Welty: This letter reports the results of our data review regarding a known gasoline leak at property adjacent to the Tomato Growers Association property at 9036 Thornton Road. Between January 9 and March 14, 1990, a representative of Brown and Caldwell Engineers reviewed the file available at the Central Valley Region Regional Water Quality Control Board (RWQCB) concerning Southland Corporation's (Southland) 7-Eleven property located at 9110 Thornton Road (site). The data available in the RWQCB files consisted of reports prepared by Southland's consultant,Groundwater Technology,Inc. (GTI),and correspondence from regulatory agencies up to February of 199,0. A site visit. was conducted by a Brown and Caldwell representative on January 15, 1990 to inspect the remediation system in-place on the site and to determine the environmental setting. Site Visit The 7-Eleven property was visited by a Brown and.Caldwell engineer on January 15, 1990. The engineer inspected the on-site groundwater and soil-vent system. The system appeared in good working order with no visible emissions from the air stripping tower. Background The following information has been obtained from reports prepared by GTI. In March of 1986, a 10,000-gallon unleaded gasoline tank system at the 7-Eleven Gasoline service station located at 9110 Thornton Road was discovered to not be product-tight. The system was shut down on April 2, 1986. Gasoline is believed to have leaked from product and I