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K L E I N F E L D E R File No. 20-YP4071 June 23, 1994 PROPOSAL LIMITED SOIL AND GROUNDWATER ASSESSMENT TOP FILLING STATION 101 SOUTH WILSON WAY STOCKTON, CALIFORNIA 95205 (APN 151-253-05/06/07) JyMODU T( ION Kleinfelder is pleased to present this proposal to Top Filling Station. This proposal was developed after discussions with Ms. Linda Turkatte of the San Joaquin Public Health Services Department Environmental Health Division (SJCEHD) and Messrs. Ed and Ken Endich of Top Filling Station, using Kleinfelder's current understanding of the site conditions, and is a preliminary understanding of the SJCEHD's desires and requirements. We prepared this proposal based on information Central Valley Officeo(RWQCB), and the SJCEHD- rkplan by the State of California Regional Water Quality Kleinfelder is committed to providing a high level of service to its clients, commensurate with their wants and needs. If a portion of this proposal does not meet the needs of the client, or if those needs have changed, Kleinfelder stands ready to consider appropriate modifications, subject to the standards of care to which we adhere as professionals. Modifications such as changes in scope, methodology, scheduling, and contract terms and conditions may result in changes to the risks assumed by the client, as well as adjustments to our fees. We look forward to the opportunity to serve you. BACK(=ROUND The site is located at 101 South Wilson Way in a commercial area of Stockton, California. On December 7, 1988 two underground gasoline storage tanks were removed from the project site. At the time of the tank removal, a soil sample was obtained beneath each of both underground gasoline storage tanks and under each line to the supply island by Mr. Nick Bokides of Precision Industries, Inc. of Stockton, California. The results of the analyses performed indicated concentrations of up to 2200 parts per million (ppm), 22 ppm, 100 ppm, 68 ppm, and 520 ppm; Total Petroleum Hydrocarbon (TPH-G), Benzene, Toluene, Ethylbenzene, and Xylene, respectively, beneath the gasoline storage tanks. Additionally, soil samples obtained from beneath the lines to the supply island had less than the detection limit for all analyses performed. ETH:md 3E/94 Page 1 of 6 Copyright 1994 Kleinfelder, Inc.