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I <br /> I ,j <br /> f t <br /> SECOR <br /> International Incorporated <br /> May 13, 2002 <br /> Project 77CH.96258.00.4130 <br /> Ms. Rebecca E. Setliff <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Ave. 3rd Floor <br /> Stockton, CA 95201-0388 <br /> Re: Work Plan for Site Assessment <br /> Chevron Service Station 9-6258 <br /> 2409 East Main Street at F Street <br /> Stockton, California <br /> Dear Ms. Setliff: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br /> (Chevron), presents this work plan for groundwater assessment at the above referenced <br /> site (Figure 1). This plan is submitted in response to the request of California Regional <br /> Water Quality Control Board (CRWQCB) letters dated, October 29, 2001 and April 16, <br /> 2002 (Attachment A). <br /> OBJECTIVE <br /> The objective of this assessment is to further delineate the horizontal extent of <br /> petroleum hydrocarbons in groundwater downgradient of the former underground <br /> storage tank(UST). Planned work will include: <br /> • Provide a downgradient groundwater monitoring well; <br /> • Evaluate potential sensitive receptors; <br /> SITE BACKGROUND <br /> The site is located at the northeast corner of East Main Street and F Street in Stockton, <br /> CA. Currently, the site is vacant, and was previously utilized as a Chevron service <br /> station. Former facilities on the site included three gasoline USTs, one waste oil UST, <br /> underground product piping and associated dispensers. The USTs were reportedly <br /> installed at the site in 1955 and the gasoline USTs were reportedly removed in 1976. <br /> The waste oil tank was removed in 1996. The former USTs consisted of three steel- <br /> walled gasoline fuel tanks (one 5,000-gallon supreme, one 2,000-gallon mid-grade, and <br /> one 5,000-gallon regular) and one steel-walled 550-gallon waste oil tank (Figure 2). No <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br /> I <br /> i <br />