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i <br /> M PUBLIC HEALTH SERVICES oPaLilly. . <br /> �a <br /> SAN JOAQUIN COUNTY N <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer q. , <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 FSR <br /> 209/468-3420 <br /> ROGER LISTON <br /> DARPETRO INC <br /> 3450 EL CAMINO AVE <br /> CERES CA 95206 <br /> RE: Darpetro Exxon Site Code: RO# 253 <br /> 749 Charter Way <br /> Stockton CA 95206 <br /> WORK PLAN: Work Plan DATED: February 29, 2000 <br /> PREPARED BY: California Geophysical Group Inc. <br /> APPROVED [ ] ; "-- — . <br /> DISAPPROVED [[Rl] <br /> ADDENDUM NEEDED Submit New Work Plan by: Aril 12 2000 <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299.37,subd(c)(3)1: <br /> Work proposed does not contain adequate and necessary elements (see PHS/EHD letter dated January 10, 2000), <br /> REASONS FOR DISAPPROVAL OF THE WORK PLAN [H&S 25299.37,subd(c)(3)1: <br /> 1 . Plan does not include sufficient investigative work to define the lateral and vertical extent of contamination with <br /> soil borings and appropriately screened Monitoring Wells (MWs). Evaluation of both deep and shallow aquifer <br /> (currently installed MWs are over-screened except for BM12 and possibly BMI) must be performed. A proposal <br /> for investigating feasible alternatives for remediation of contamination in soil and water below the vadose zone <br /> should be included in the work. Additional borings using the cone penetrometry test method are recommended. <br /> 2. For the proposed deep boring, soil and groundwater sample collection locations proposed are a duplication of <br /> previous data collected 80 feet bsg and above. <br /> 3. Sample analysis for Oxygenates is not proposed. Oxygenates should be analyzed in soil and water samples using <br /> US EPA Method 8260B (see PHS/EHD letter dated June 18, 1998). <br /> 4. Plan does not contain a method for evaluating the effectiveness of the soil vapor extraction and air sparging <br /> systems. Remediation efforts at the site have ceased. A work plan to address remediation of soil and water <br /> contamination at the site must be submitted to PHS/EHD by the above referenced date. <br /> 5. Site map doesnot show the location of the previous dispenser and fuel lines. Submit an accurate site map. <br /> 6. PHS/EHD recommends that you contact and work with consultants and responsible party's from adjoining <br /> properties in order to better characterize the nature and extent of contamination at this site and to employ the <br /> most appropriate remediation method(s). - <br /> DATED _3 3 / ` rev BY (? it re <br /> Carol Oz Senior REHS. (209) 468-3440 <br /> Faxed to consultant. <br /> A Division of San Joaquin County Health Care Services <br />