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r <br /> SECOR <br /> International Incorporated <br /> 0 <br /> August 9, 2001 <br /> Project 077.43536.101 w <br /> Mr. Mike Infurna 3 <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Street, 3`a Floor sP <br /> Stockton, CA 95202 <br /> Re: Work Plan for Site Assessment <br /> Chevron Station#20-1383 <br /> 1960 West I Vh Street <br /> Tracy, California <br /> Dear Mr. Infurna: <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 /> Chevron site (Figure 1). This work plan is being prepared in response to a detection of <br /> methyl tertiary-butyl-ether(MtBE)in a groundwater sample taken from a soil boring on <br /> the proposed Safeway property north of the site as documented in GeoTrans report Pre- <br /> Gas Station Screening Level II Environmental Assessment, dated May 31, 2001. Six <br /> Geoprobe borings will be advanced along the northern property boundary to collect <br /> groundwater samples as described in the following Proposed Scope of Work. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an operating Chevron station located at 1960 West 11`"Street, in Tracy, <br /> California. Current station features include three USTs in a common excavation, a <br /> station building, six product dispensers under a common canopy, and a car wash. The <br /> site was formerly agricultural land. <br /> CalTrans operates a corporate yard to the west of the Chevron station and is reported to <br /> have two 2,000 gallon and four 500 gallon underground storage tanks (USTs). To the <br /> north of the Chevron, a Safeway with a gasoline service station is being developed. <br /> Based on the GeoTrans investigation, groundwater is anticipated to be encountered at <br /> approximately 9 to 11 feet below ground surface (bgs). Based on local topography, <br /> groundwater flow is anticipated to be generally to the north/northwest in the Tracy <br /> area. �— <br /> A summary of previous investigations is included in Attachment A. <br /> 3017 Kilgore Road, Suite 100, Rancbo Cordova, CA 95670 916.861.0400916.861.0430 Fax ww.secor.com <br />