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SECOR www secorcom INTERNATIONAL (� fff {{{ 3 ® � iNCQRPORATEa � A�� . 916-861-0430 FAx J U L 0 7 2003 July 3, 2003 ENVIRONMENT HEALTH PERMIT/SERVICES Mr Jeffrey W ong San Joaquin County Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, California 95202 RE 2003 Site Assessment Report and Sensitive Receptor Survey Report Former Chevron Service Station 9-6258 2409 East Main Street j Stockton, California SECOR Project No 77CH 96258 01 0103 Dear Mr Wong ,j SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management �I Company (Chevron), presents this report to document the results of assessment activities and a + sensitive receptor survey at the above-referenced site (Figure 1) The site assessment activities consisted of drilling and installing one downgradient groundwater monitoring well (Figure 2) The sensitive receptor survey consisted of performing a 500-foot door-to-door well search, reviewing Department of Water Resources (DWR) drillers well logs, and contacting local water purveyors and . state agencies (Figure 3) The purpose of this assessment is to further delineate the horizontal extent of petroleum hydrocarbons in groundwater downgradient of the former underground storage tank (UST) and evaluate any potential sensitive receptors in the vicinity of the site This work was completed in accordance with SECOR's Work Plan for Further Assessment, dated May 13, 2002 SITE BACKGROUND t The site was previously utilized as a Chevron service station and is located at the northeast corner of East Main Street and F Street in Stockton, California The site Is currently vacant Former facilities on the site Included three gasoline USTs, one waste oil UST, underground product piping and associated dispensers The USTs were reportedly installed at the site in 1955 and the gasoline USTs were reportedly removed In 1976 The waste oil tank was removed in 1996 The former USTs consisted of three steel-walled gasoline fuel tanks (one 5,000-gallon supreme, one 2,000-gallon mid- grade, and one 5,000-gallon regular) and one steel-walled 550-gallon waste oil tank (Figure 2) A summary of previous investigations Is presented in Attachment A SITE ASSESSMENT ACTIVITIES On May 28, 2003, SECOR supervised Cascade Drilling (Cascade) of Sacramento, California, as they advanced one soil boring to approximately 68 feet below ground surface (bgs) using 8-inch diameter hollow-stem augers at the location shown on Figure 2 The first eight feet (bgs) of the soil boring was evacuated using an air knife technique Soil samples were collected for logging and/or chemical analysis at five-foot intervals, starting at approximately 10 feet bgs Upon completion of drilling, a 2-inch diameter groundwater monitoring well (MW-4) was Installed in the boring A summary of the field and laboratory procedures followed during these activities Is Included as Attachment B The findings of this assessment are summarized below 11Ghevron1962581REPORTSISAR_2003 doc