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Organic Vapor Procedures <br /> Soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for <br /> ionizable organic compounds using a photo-ionization detector(PID) with a 10 2 eV lamp <br /> The test procedure will involve measunnq approximately 30 grams from an undisturbed soil <br /> sample, placing this subsample in a ziplock type bag and sealing the bag The bag was <br /> warmed for approximately 20 minutes (in the sun), then the head-space within the container <br /> was tested for total organic vapor, measured in parts per million as benzene (ppm, <br /> volume/volume) The instrument was calibrated prior to drilling using a 100-ppm <br /> isobutylene standard (in air) and a sensitivity factor of 55 which relates the photo-ionization <br /> potential of benzene to that of isobutylene at 100 ppm The results of the field testing were <br /> noted on the boring logs PID readings are useful for indicating relative levels of <br /> contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of <br /> laboratory analyses <br /> Laboratory Procedures <br /> Selected soil and groundwater samples collected from the soil borings and groundwater <br /> samples collected from the soil borings and wells were analyzed for the presence of TPH-g, <br /> BTEX, and Oxygenates using modified EPA Methods 8015/8020 and 8260 <br /> Soil Cuttings and Purge Water <br /> Soil cuttings generated during drilling operations were transported by Manley and Sons <br /> Trucking to Forward Landfill in Manteca, CA for treatment and disposal Water generated <br /> during steam cleaning, and development and sampling of the new wells are also temporarily <br /> stored in DOT-approved 55-gallon drums Water will be removed by Tosco's disposal <br /> contractor to an appropriate disposal facility <br /> 911007 18/Solgwrpt A - 2 September 23, 1998 <br />