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IEIMI���lE1NE1 <br /> Mr. Roy Knight <br /> 13 November 1997 <br /> Page 2 <br /> chain-of-custody form to Excelchem Environmental Labs of Roseville, a State-Certified <br /> Laboratory, for analysis of the following constituents: <br /> • Cadmium, Chromium, Lead,Zinc, and Nickel using EPA Method 3050A. <br /> • Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX) and Methyl Tertiary <br /> Butyl Ether(MTBE)using EPA Method 8020 <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) and as Diesel (TPH-D) using <br /> EPA Method 8015 <br /> • Total Oil and Grease using EPA Method 5520B <br /> • PCBs(Poly Chlorinated Biphenyls)using EPA Method 8080 <br /> • Chlorinated Hydrocarbons(CLHCs)using EPA Method 8240 <br /> • PNAs(Polynuclear Aromatics)using EPA method 8270 <br /> The results of these analyses were presented in the Helmick and Lerner Inc. Storm Drain Sampling <br /> Report, Stockton Unified School District Maintenance and Transportation Center dated 10 October <br /> 1997. The report concluded that 10 the constituents present in the soil were typically found in <br /> petroleum hydrocarbons, 2) PNAs and chlorinated solvents were not detected, and 3) metals <br /> concentrations were below levels defined as hazardous wastes. <br /> SOIL INVESTIGATION <br /> The purpose of the current soil investigation was to evaluate the vertical and lateral extent of <br /> petroleum hydrocarbons in and around the four drain inlets in the vicinity of the HVAC Building <br /> (refer to Figure 1). Initially,there was thought to be five drain inlets which did not have concrete <br /> bottoms; however, one of these drains was found to have a concrete bottom. Except for Drain <br /> Inlet 4 (DI-4), soil borings were drilled in the center of each drain inlet and one to each side. <br /> Two additional soil borings were drilled at DI-4 because diesel hydrocarbons were detected in <br /> the center boring and one of the lateral borings. <br /> Geoprobe Sampling Protocol <br /> Sampling was conducted by the GeoProbe method which consisted of collecting a sample with a <br /> hydraulically driven, 2-inch diameter continuous corer. By inserting PETG liners inside of a <br /> corer, soil samples were recovered at a minimum of 4-foot intervals for lithologic logging and <br /> field screening. To minimize the potential for cross-contamination, coring equipment and liners <br /> were cleaned with a tri-sodium phosphate solution prior to drilling each boring. After the soil <br />