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SECOR ENTERNA'n0NA1_ 3017 Kilgore Road,Suite 100 Rancho Cordova,GA 95670 S E C 0 916-861-0400 TEL 916-861-0430 FAx June 11, 2004 Ms. Victoria McCartney J U h 1 5 2004 San Joaquin County Environmental Health Division 304 East Weber Avenue, Third Floor ENVIRUNMENT HLALTH Stockton, California 95205 PERMIT/SERVICES RE: 2004 Site Assessment Report Former Chevron Service Station 9-0557 139 South Center Street Stockton, California SECOR Project No.: 77CH.90557.04.0170 Dear Ms. McCartney: SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company (Chevron), has prepared this report to present the results of assessment activities at the above-referenced site. The purpose of these assessment activities was to replace groundwater monitoring wells destroyed prior to station demolition activities in 2003 and to assess the vertical extent of petroleum hydrocarbon impacts to soil and groundwater in the former underground storage tank (UST) complex destroyed in 1990. This work was performed as outlined in SECOR's Work Plan for Monitoring Well Installation (Work Plan), dated June 24, 2003, and addendum to the Work Plan, dated December 30, 2003. The Work Plan and addendum to the Work Plan were approved by the San Joaquin County Environmental Health Division (County) as indicated in their letters, dated November 17, 2003, and February 13, 2004, respectively (Attachment 1). SITE DESCRIPTION The site is located at 139 South Center Street in Stockton, California (Figure 1). Former station facilities, removed in 2003, included two pump islands under a common canopy, three double-walled steel USTs, one double-walled steel used-oil UST, and a station building. The USTs were removed in 1990. Locations of former station facilities are shown on Figure 2. The area surrounding the site consists primarily of commercial land uses. Topography in the area of the site is relatively flat and is approximately 12 feet above mean sea level (msl). The nearest surface water bodies are: 1) the Mormon Slough, located approximately 114-mile south of the site; 2) the Yacht Harbor, located approximately 114-mile north of the site; and 3) the Port of Stockton, located approximately one mile west of the site. ASSESSMENT ACTIVITIES AND FINDINGS During March and April of 2004, SECOR supervised Cone Penetrometer Testing (CPT) and monitoring well installation to further assess soil and groundwater conditions beneath the site. Locations of CPT borings and monitoring wells are shown on Figure 2. A summary of field and laboratory procedures is presented in Attachment 2. :1Chevron1905571REPORTS1200412004 Site Assessment. ReVB.doc