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SITE INVESTIGATION WORK PLAN.. 800 WEST CHURCH STREET VvINF STOCKTON, CALIFORNIA 3.2 TASK 2: SOIL SAMPLING Soil samples will be collected from the borings depicted on Figure 14. The soil sample collection methodology is summarized below. 3.2.1 Soil Sample Collection Methodology Soil samples will be collected from borings advanced usingHydraulic direct-push drilling equipment operated by a California state C-57 licensed well drilling contractor. Soil cores will be collected continuously for lithologic characterization and described on boring logs using the Unified Soil Classification System. The soil samples will be collected using a 2-inch diameter 4- foot long continuous core barrel outfitted with an acetate liner. The down-hole reusable sampling equipment will be decontaminated prior to reuse at each sampling location.- The ocation.The soil samples will be field screened.for total organic vapors using a photo-ionization detector (PID) equipped with a 10.6 electronic volt(eV) lamp and calibrated with 100 parts per million by volume (ppm ) isobutylene gas.for organic vapors using closed headspace techniques. The results of the field screening will be :recorded on the boring logs. The .soil samples will be collected at the target depths as indicated on-Table 3-1 by cutting the acetate liners. The ends of the acetate liner sample will be covered with Teflon sheets and plastic end caps. The soil samples will then be labeled, placed in a chilled cooler and transported to K Prime, Inc., of Santa Rosa, California, a California Department of Public Health.(CDPH) Environmental Laboratory Accreditation Program (ELAP) certified laboratory for chemical analysis following the chain-of-custody procedures outlined in ASTM D 4840. The soil samples will be analyzed for the suite of chemicals as identified in Table 371. Soil cuttings generated during boring advancement will be placed in United States Department of Transportation (USDOT) approved 55-gallon steel drums. The 55-gallon drums will be labeled and temporarily stored at the Site pending analytical review of the soil samples. The soil cuttings 4 _ • 5/11