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SECOR <br /> International Incorporated <br /> July 22, 2002 <br /> Project No. 77CH.20764.00.0870 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street, 3`d Floor <br /> Stockton, California 95202 <br /> RE: Groundwater Monitoring Well Destruction <br /> Chevron Service Station No. 20-0764 <br /> 4747 N. West Lane <br /> Stockton, California <br /> Dear Ms. Lagorio: <br /> This letter prepared by SECOR International Incorporated (SECOR) on behalf of the <br /> Chevron Products Company(Chevron), documents the well destruction activities at the <br /> above referenced site (Figure 1). The well destruction permit, approved by San Joaquin <br /> County Environmental Health Department (SJEHD), is included in Attachment A. <br /> SITE BACKGROUND <br /> The site is an operating Chevron service station located in a commercial area of Stockton, <br /> California. The current station facilities include two dispenser islands and a mini-mart under <br /> a common canopy, three gasoline underground storage tanks (USTs), and a carwash. <br /> WELL ABANDONMENT ACTIVITES <br /> On May 21, 2002, monitoring wells MW-1 through MW-3 were destroyed by Cascade <br /> Drilling Incorporated of Rancho Cordova, California, a state-licensed well driller. Well <br /> destruction activities were observed by a SECOR representitive. The groundwater <br /> monitoring wells were destroyed in accordance with San Joaquin County requirements and <br /> Bulletin 74-90: California Well Standards, California Department of Water Resources,June <br /> 1991. The three monitoring wells were abandoned by first pressure grouting (30 psi) the <br /> wells from the bottom up using a tremie pipe with Portland type IM neat cement, the wells <br /> were then excavated around the outside of the well box approximately tweleve inches wider <br /> than the well box. The wells were then drilled out around the well casing to approximately <br /> three feet below ground surface (bgs)with the well casing being cut off six inches above the <br /> bottom of the excavation and removed. The well boxes were removed, and the boreholes <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />