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SNrFN ENVIRONMENTAL TECHNOLOGIES CORPORATION October 30, 1997 Ms. Mary Meays San Joaquin County Public Health Services, EHD PO Box 388 Stockton, CA 95201-0388 Subject: Workplan to Implement a Feasibility Study and to Complete the Groundwater Investigation at 26056/26080 Thornton Road, Thornton, California Dear Ms. Meays: INTRODUCTION Smith Technology Corporation (acquired by ATC Associates Inc.), on behalf of Ms. Donna Gardner, has prepared this workplan to implement a feasibility study and to complete the groundwater investigation at the above referenced site (Figure 1). The proposed scope of work contained in this workplan is based on Smith Technology's Problem Assessment Report - Interim Remedial Plan dated September 4, 1997, Smith Technology's Plan Addendum dated October 15, 1997, and San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) correspondence dated September 22, and October 20, 1997. BACKGROUND Site Location The project site is located at 26080 Thornton Road, Thornton, California. The site location is shown on Figure 1. The site is located in a residential/commercial area in downtown Thornton. Immediately north of the project site's property boundary is a municipal well compound for Thornton Municipal Well No. 2 (the Supply Well) and a U.S. Post Office building (Figure 2). Previous Work On September 6, 1989, three underground gasoline storage tanks were removed at the project site by Western Meter Service of Stockton, California. Soil samples were collected beneath each tank and the associated piping. Soil samples collected from beneath two of the tanks contained moderate to high levels of ethylbenzene and xylenes (1.2 to 70 parts per million [ppm]) as well as total petroleum hydrocarbons as gasoline (TPHg) at 470 to 830 ppm. 1260 Graphics Drive Modesto, CA 95351-1502 (209) 579-2221 Fax (209) 579-2225 Engineering Consulting • Remediation Construction