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s <br /> COR <br /> 0'� Inttnal Incorporated <br /> 4?9 <br /> June 11, 2002 <br /> Project 77CH.43602.00.0203 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re: Site Assessment Report and Work Plan for Further Assessment <br /> Chevron Service Station 9-1452 <br /> 334 East Main Street <br /> Ripon, California <br /> Dear Ms. Lagorio: <br /> SECOR International Incorporated (SECOR) on behalf of Chevron Products Company <br /> (Chevron) has prepared this letter to document the results of assessment activities at the <br /> above-referenced site. The objective of this assessment was to evaluate soil and <br /> groundwater conditions southwest of the present and former underground storage tank <br /> (UST) complexes. Site assessment activities consisted of the drilling and installation of <br /> five groundwater monitoring wells. Slug tests were also preformed on three previously <br /> installed wells. Based on the data collected during this assessment, SECOR has provided <br /> a work plan for further assessment at the site. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an active service station located at 334 East Main Street in Ripon, California <br /> (Figure 1). Current site facilities include three 12,000-gallon gasoline USTs, two <br /> dispenser islands under a common canopy, and a station building containing two <br /> hydraulic hoists (Figure 2). A summary of previous investigations is presented in <br /> Attachment A. <br /> ASSESSMENT ACTIVITIES AND FINDINGS <br /> On January 7 through 9, 2002, a SECOR representative oversaw V & W Drilling <br /> Incorporated (V & W) of Isleton, California, as they advanced two shallow and three <br /> deep soil borings (Figure 2). Soil samples were collected continuously from the deeper <br /> borings to assess soil stratigraphy below 40 feet below ground surface (bgs). Soil <br /> samples above 40 feet bgs were not collected due to the borings close proximity to the <br /> 1AChevron1914521REP0RTS19-1452 2002 MW SA.doc <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.seCOr.com <br />