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Organic Vapor Procedures Select soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for ionizable organic compounds using a flame-ionization detector (FID) or a photo-ionization detector (PID) with a 10 2 eV lamp. The test procedure involved measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a zlplock type bag, and sealed The container was warmed for approximately 20 minutes (in the sun), then the head- space within the contamer was tested for total organic vapor, measured in parts per million as benzene (ppm, volume/volume) The instrument was calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55 which relates the photo-ionization potential of benzene to that of isobutylene at 100 ppm The results of the field testing were noted on the boring logs PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confi- dence of laboratory analyses Laboratory Procedures Selected soil samples collected from the soil borings and groundwater samples collected from the wells were analyzed for the presence of total petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, toluene, ethylbenzene, and total xylenes (BTEX), and methyl • tertiary-butyl ether (MtBE) by EPA Methods 8015 Modified and 8020 The highest MtBE detection from each boring was confirmed by EPA Method 8260 In addition the sample analyzed for MtBE by EPA Method 8260 was also analyzed for 1,2-dichloroethane (1,2- DCA), ethylene dibromide (EDB) and total lead Soil Cuttings and Purge Water Soil cuttings generated during drilling operations were temporarily stored on site and covered with plastic sheeting pending characterization and disposal Manley Trucking transported the soil cuttings to Forward Landfill for disposal Water generated°during steam cleaning, development, and sampling of the new wells was temporarily stored in DOT-approved 55- gallon drums pending transport Gettler Ryan transported the rmsate and purge water to Tosco's Rodeo CA refinery for recycling 911001 1B/0102/Workpian A- 2 03/13/01