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PUBLIC nEALTH SERVICES 'pP41u�N.•.0 <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION i :< <br /> Karen Furst, M.D., M.P.H., Health OfficerP <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 ILE COPY <br /> NESS CERVANTES <br /> JC TRUCKING JUL 13 1998 <br /> PO sax 6008 <br /> STOCKTON CA 95206-0008 <br /> RE: JC Trucking Site Code: 2571 <br /> 1207 S Aurora <br /> Stockton CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the"Preliminary Investigation and Evaluation Report" dated January 5, 1998 which was <br /> prepared by AquaGeosciences, Inc. (AGI) for the above referenced site, and has the following <br /> comments for your consideration and action. <br /> Field work at the above referenced site was conducted by AGI on August 18-20, 1997. Field work <br /> consisted of the advancement of nine geoprobe soil borings, and the collection for analysis of soil <br /> and water samples from each boring. Previous soil sample collection done in May 1992 following <br /> the removal of two 4000 gallon gasoline tanks and two 5000 gallon diesel tanks had evidenced <br /> significant petroleum hydrocarbon contamination under all tanks. <br /> During the work performed in August, 1997, soil samples were collected from each boring at five <br /> foot intervals beginning at approximately five feet below surface grade (bsg) and continuing to <br /> approximately 40-45 feet bsg. Soil samples collected at 40 feet bsg from each boring were <br /> submitted for analysis, and all but two (B-3 and B-9) evidenced petroleum hydrocarbon <br /> contamination at this level. B-3 and B-9 are located generally west of, and possibly up-gradient <br /> from, the former tank locations. Grab water samples were collected from each boring and <br /> analysis evidenced some level of hydrocarbon contamination in each one. Based on these results <br /> it is apparent to PHS/EHD that neither vertical nor lateral definition of hydrocarbon contamination <br /> in soil or ground water has been made. It is generally accepted that definition is considered to <br /> have been made when two consecutive five-foot interval soil samples with no contamination <br /> detected exist. <br /> The report failed to include the laboratory analysis results for soil samples B-4-40, B-5-16, B-5-25, <br /> B-5-35, B•-5-40, B-6-26, B-6-35, B-640, B-7-35, B-740, B-8-25, and B-8-30. The report also <br /> failed to include Quality Assurance/Quality Control sheets from the lab for the day the samples <br /> were analyzed. <br /> Further soil and groundwater definition is required. Vertical soil definition should be made in the <br /> source areas, and lateral soil definition should be made in all directions from each source area. <br /> As there are two source areas on site (two separate tank locations), it is likely that more than four <br /> monitoring wells will be required to make full definition of the groundwater contaminant plume. <br /> A Division of San Joaquin Counry He-ash Care Services <br />