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SECOR <br /> International Incorporated <br /> September 19, 2001 <br /> Project 077.43572.110 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street, 3`d Floor <br /> Stockton, California 95202 <br /> Re: Work Plan for Site Assessment <br /> Chevron Service Station#20-0794 <br /> 4747 North West Lane <br /> Stockton, California <br /> Dear Ms. Lagorio: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), presents this work plan for site assessment activities consisting of the <br /> drilling and installation of three groundwater monitoring wells and the possible <br /> advancement of seven cone penetrometer test(CPT)borings along the southern property <br /> boundary. The purpose of this assessment is to determine if methyl tertiary butyl ether <br /> (MtBE) is a potential threat to a municipal supply well located to the south of the site <br /> (Figure 1). <br /> This work plan includes a brief discussion of site background, summary of previous <br /> investigations, and proposed scope of work. <br /> SITE BACKGROUND <br /> The site is an operating Chevron service station located in a commercial area of <br /> Stockton, California. The current station facilities include two dispenser islands and a <br /> mini-mart under a common canopy, three gasoline underground storage tanks (USTs), <br /> and a carwash. Figure 2 shows the current station facilities. <br /> Information on any previous investigations was not available. <br /> PROPOSED SCOPE OF WORK <br /> The scope of work for this site assessment will include the drilling and installation of <br /> three groundwater monitoring wells at the general locations shown on Figure 2. Based <br /> on the results of the soil and groundwater chemical analyses, the CPT borings may be <br /> completed to assess soil stratigraphy and to collect soil and groundwater samples for <br /> chemical analysis. <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />