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SECOR <br />International Incorporated <br />June 11, 2002 <br />Project No. 77CH.92033.00.0203 <br />Mr. Margaret Lagorio <br />San Joaquin County Environmental Health Department (SJCEHD) <br />304 E. Weber Avenue, Third Floor <br />Stockton, CA 95207-0388 <br />Re: Addendum to the Work Plan for Further Assessment <br />Chevron Service Station 9-2033 <br />508 West Charter Way <br />Stockton, California <br />Dear Ms. Lagorio: <br />SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br />(Chevron), presents this addendum to SECOR's Site Assessment Report and Work Plan <br />for Further Assessment (the Work Plan), dated March 5, 2002, for the above -referenced <br />site (Figure 1). This addendum has been prepared in response to SJEHD's letter, dated <br />April 16, 2002, and pursuant to a discussion with Mr. Sam Savig of the SJEHD in a <br />meeting at the above referenced site on March 22, 2002. In addition to the work <br />proposed in the Work Plan, the following activities are proposed to complete the <br />assessment of the site: <br />• Well Destruction. Monitoring well MW -1 will be destroyed by over-drilling to <br />total depth, contents removed and grouted to surface grade with tremie-pipe. <br />The well box will also be removed and finished to surface grade with cement. <br />• Proposed Well Relocations. Proposed monitoring wells MW -4, MW -5 and <br />MW -6 will be relocated to the area of the former underground storage tanks <br />(Figure 2) to further define the vertical extent of soil contamination at the site. <br />Soil and groundwater samples will be collected as stated in the original Work <br />Plan. <br />• Cone Penetration Testing (CPT) Borings. Seven CPT borings will be <br />advanced around the perimeter of the site in the general locations shown in <br />Figure 2. These borings will be advanced to approximately 90 to 95 feet below <br />ground surface (bgs) or until rig refusal is met, to collect continuous soil <br />stratigraphic data at each location. <br />• Groundwater Sampling. Immediately adjacent to each CPT borehole, a second <br />direct -push borehole will be advanced to collect depth -discrete groundwater <br />samples. Depths of the discrete groundwater samples will be determined from <br />3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />