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SECOR <br /> International Incorporated <br /> April 5, 2002 j <br /> D f l S� <br /> Project 77.CH.43593.00.0203 ' � � tL <br /> Mr. Sam Savig APR 1 0 2002 <br /> San Joaquin County Enviromnental Health Department <br /> 304 East Weber Street, 3rd Floor ���''��"��'��'����HEALTH <br /> PERMIT/SERVICESStockton, California 95202 <br /> Re: Site Assessment Report <br /> Chevron Service Station 20-8118 <br /> 3355 East Hammer Lane <br /> Stockton, California <br /> Dear Mr. Savig: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Products Company(Chevron), <br /> presents this report to document the results of assessment activities at the above-referenced site. The <br /> site assessment consisted of the drilling and installation of three groundwater monitoring wells and <br /> the advancement of cone penetrometer test (CPT)borings at eleven locations at the site. <br /> Groundwater samples were collected from the monitoring wells during two events and slug tests <br /> were performed on the newly installed wells. The purpose of this assessment was to determine if <br /> methyl tertiary butyl ether(MtBE) is a potential threat to a municipal drinking water supply well <br /> (well# 26) located to the east of the site (Figure 1). The work was done in accordance with <br /> SECOR's work plan, dated September 19, 2001, which was approved by the San Joaquin County <br /> Environmental Health Department (SJCEHD) on October 10, 2001. <br /> SITE BACKGROUND <br /> The site is an operating Chevron service station located in a commercial area of Stockton, California. <br /> The current station facilities include three dispenser islands under a canopy, two gasoline <br /> underground storage tanks (USTs), and a station building/McDonald's restaurant (Figure 2). <br /> ASSESSMENT ACTIVITIES AND FINDINGS <br /> Monitoring Well Installation <br /> On October 16, 2001, SECOR supervised Cascade Drilling of Rancho Cordova, California, as they <br /> advanced three soil borings to approximately 72 feet below ground surface (bgs) at the locations <br /> shown on Figure 2. Soil samples for logging and chemical analyses were collected in five-foot <br /> intervals, and two-inch diameter groundwater monitoring well was installed in each boring. After <br /> completion, the wells were developed and groundwater samples were collected on November 13, <br /> 2001. Additional groundwater samples were also collected during a second monitoring event on <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova; CA 95670 916.861.0400 916,86i.o43o Fax www.Secor.com <br />