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I 1 <br /> li 4 <br /> detector (PID) with a 10 2 eV lamp The test procedure involved measuring approximately <br /> 30 grams from an undisturbed soil sample, placing this subsample in a clean glass lar, and <br /> sealing the lar with aluminum foil secured under a ring-type threaded lid The lar was warmed <br /> for approximately 20 minutes (in the sun), the foil pierced, and the head-space within the lar <br /> 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 isobutylene <br /> standard (in air) and a sensitivity factor of 55 which relates the photo-ionization potential of <br /> benzene to that of isobutylene at 100 ppm The results of the field testing are noted on the <br /> boring logs PID readings are useful for indicating relative levels of contamination, but cannot <br /> be used to evaluate hydrocarbon levels with the confidence of laboratory analyses <br /> Well Development and Groundwater Sampling <br /> The new monitoring wells were developed by surging the screened interval with a surge block <br /> and purging ten casing volumes of water from the well Well development purgewater was <br /> stored and disposed with the steamcleaner rinsate generated during drilling <br /> Rinsate, Purge, Development Waters, and Soil Cuttings Storage and <br /> Disposal <br /> . Waters produced during field activities were transported via a purge trailer and disposed of at <br /> a state-certified treatment and disposal facility Steam cleaning ansate water from drilling was <br /> temporarily stored on site in DOT-approved 55-gallon drums pending transport and disposal <br /> Soil cuttings generated during drilling were placed on visqueen and covered with plastic <br /> Samples of the cuttings were collected and sent to a state-certified laboratory for analysis <br /> Pending analytical results, the soil cuttings will be hauled by a state-certified waste hauler to a <br /> state-certified treatment and disposal facility <br /> Laboratory Procedures <br /> Selected soil samples and groundwater samples were analyzed by a California State-certified <br /> laboratory for the presence of total purgeable petroleum hydrocarbons calculated as gasoline <br /> (TPPH-g), benzene, toluene, ethylbenzene, and xylenes (BTEX compounds) and MTBE using <br /> modified EPA Methods 8015 and 8020 In addition, selected soil and groundwater samples <br /> were analyzed for the presence of total extractable petroleum hydrocarbons calculated as <br /> diesel (TEPH-d)using modified EPA Method 8015 <br /> 3201591A/REPORT A-2 May 6, 1996 <br />