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k 1 <br /> Organic Vapor Procedures <br /> Soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for <br /> iorizable organic compounds using the HNU Model PI-101 (or equivalent) photo-ionization <br /> detector (PID) with a 10 2 eV lamp The test procedure involves measuring approximately <br /> 30 grams from an undisturbed soil sample, placing this subsample in a clean glass jar, and <br /> sealing the jar with aluminum foil secured under a nng-type threaded lid The jar was warmed <br /> for approximately 20 minutes (in the sun), the foil pierced, and the head-space within the jar <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 /> Rinsate Waters, and Soil Cuttings Storage and 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 When necessary, waters were temporarily <br /> stored on site in DOT-approved 55-gallon drum pending transport and disposal <br /> SLaboratory Procedures <br /> Selected soil samples were analyzed by a California State-certified laboratory for the presence <br /> of total purgeable petroleum hydrocarbons calculated as gasoline (TPPH-g), benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX compounds) using EPA Methods 8015 and 8020 <br /> 3201351A/REPORT A - 2 January 10, 1996 <br />