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copy SECOR ilalerualional lncotporated October 23 , 2001 Project 077 .43505 . 103 Mr. Harlin Knoll San Joaquin County Environmental Health Division 304 East Webber Avenue, Third Floor Stockton, California 95202 Re: Site Assessment Report and Work Plan for Further Assessment Chevron Service Station 9-3232 8660 Lower Sacramento Road Stockton, California Dear Mr. Knoll : SECOR International Incorporated (SECOR), on behalf of Chevron Products Company (Chevron), presents this report of the results of assessment activities performed at the above- referenced site (Figure 1). The purpose of the site assessment was to further delineate the lateral extent of petroleum hydrocarbons in groundwater beneath the site. Nine cone penetration testing (CPT) borings were advanced to assess soil stratigraphy. Adjacent to each CPT boring, a second direct-push borehole was advanced to collect groundwater samples. A water well search, performed to identify any potential sensitive receptors near the site, is also summarized in this report. Based on the findings of these site assessment activities, SECOR proposes a work plan herein for further assessment at the site. SITE BACKGROUND The site is an operating Chevron Service Station located at the southeast comer of Lower Sacramento Road and Ponce de Leon Avenue in Stockton, California. Current station facilities include a station building, car wash, four product islands under a common canopy, and three gasoline underground storage tanks in a common excavation. The station features are illustrated in Figure 2. Additional site investigation information pertinent to this assessment is summarized in Attachment A. ASSESSMENT ACTIVITIES AND FINDINGS On August 3 , 6, and 7, 2001 , a SECOR representative supervised Gregg Drilling & Testing, Inc. (Gregg) of Martinez, California, as they advanced direct push borings at nine locations (CPT- 1 through CPT-9) around the site to assess soil stratigraphy and to collect discrete groundwater samples. The CPT locations are shown in Figure 2. Each CPT boring was 3017 Kilgore Road, Suite 100. Rancbo Cordoila, CA 95670 916. 861 . 0400 916. 861 . 0430 Fax imu?. secor. can