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• Soil Cuttings and Rinsate Water <br /> Soil cuttings generated during drilling operations were temporarily stored onsite in <br /> appropriately labeled DOT-approved 55-gallon drums pending characterization and disposal <br /> Chevron's disposal contractor removed soil cuttings to an appropriate disposal facility <br /> Water generated during steam cleaning was temporarily stored in DOT-approved 55-gallon <br /> drums pending transport by Chevron's disposal contractor to an appropriate disposal or <br /> treatment facility Soil cuttings and rinsate water drums were temporarily stored onsite for <br /> approximately 1 to 2 weeks <br /> Organic Vapor Procedures <br /> Soil samples collected continuously during drilling were analyzed in the field for ionizable <br /> organic compounds using a photo-ionization detector (PID) with a 10 2 eV lamp or a flame <br /> ionization detector (FID) The test procedure involved measuring approximately 30 grams <br /> from an undisturbed soil sample, placing this sub-sample in a sealed container (either a zip- <br /> lock bag or a mason far) The container was warmed for approximately 20 minutes (in the <br /> sun), then the head-space within was tested for total organic vapor, measured in parts per <br /> million as benzene (ppmv, volume/volume) The instrument was calibrated prior to drilling <br /> using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55, which relates the <br /> photo-ionization potential of benzene to that of isobutylene at 100 ppm The results of the <br /> field-testing was noted on the boring logs PID and FID readings are useful for indicating <br /> relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the <br /> confidence of laboratory analyses <br /> Soil Sampling for Stockpiled Soil <br /> Soil samples were collected by advancing a 2-inch diameter stainless steel sample liner into <br /> the soil stockpile, after removing approximately 6-inches to 1-foot of surface material in the <br /> sample location One composite of four soil samples was collected per approximately 100 <br /> cubic yards of soil Soil samples for chemical analysis were retained in the brass liners, <br /> labeled, and capped with Teflon sheets and plastic end caps The samples were then sealed <br /> in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the <br /> appropriate chain-of-custody documentation <br />