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i Advanced GeoEnvironmental, Inc , 07 August 2007 AGE-NC Project No. 95-0128 Mr. Frank Girardi Ms. Margaret Lagorio San Joaquin County -Environmental Health Department 304 East Webber Avenue, Third Floor Stockton, California 95202 Subject: Work Plan Addendum (Remediation Plan) Soil Sampling Location PACIFIC MINI MART 4511 Pacific Avenue, Stockton, California Dear Mr. Frank Girardi: At your request Advanced GeoEnvironmental,Inc.(AGE)has prepared an additional Soil Sampling Work Plan Addendum for 4511 Pacific Avenue in Stockton, California. As directed by the San Joaquin County-Environmental Health Department by our telephone conversation on 03 August, additional information and justification for the proposed soil sampling have been compiled for your review. The site was impacted by a release from the northern dispenser island with total petroleum hydrocarbons as diesel(TPH-d),TPH-g,benzene,toluene,ethyl-benzene,xylenes(BTEX),methyl tertiary butyl ether(MTBE)and 1,2-dichloroethane (1,2-DCA). The depth to ground water during this apparent release was 50 feet below surface grade(bsg).The current depth to ground water is 30 feet bsg. A secondary release was also detected in the underground storage tank (UST ) removal samples, as multiple UST upgrades have occurred at the site. Through the operation of the ground water extraction system (11-2001 to 04-2006) at the site and the current soil vapor extraction (SVE) since January 2005, analytical data from the influent treatment samples have indicated that concentrations of the hydrocarbons being removed declined to a level below efficiency. The detections of dissolved hydrocarbons in monitoring wells have declined accordingly over the remediation cycle;currently two wells on the site of the nineteen total well monitored and sampled have detections. The EHD had verbally requested additional boring locations, increased from the March work plan proposal of two boring locations near the former dispenser island release point. Therefore, at the direction of the responsible party, a total of five shallow soil borings were proposed. The sample were proposed to be analyzed for petroleum hydrocarbons and fuel additives. The EHD has requested additional information on the specific locations of the proposed borings and the total depth of the soil boririgs.A site map for the five boring locations,proposed at location away from remediation points is included in Figure 2, I 837 Shaw Road, Slocktoii,C'aliforni i 95215 Telephone(209)467-1006 Fax(209)467-1118 1