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7. A i/ Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10.2 eV lamp or an organic vapor meter (OVM). The test procedure will involve measuring approximately 30 grams from an undisturbed soil sample, and placing this sub-sample in a sealed container (either a zip-lock bag or a mason jar). The container will be warmed for approximately 20 minutes (in the sun), then the head-space within will be tested for total organic vapor, measured in parts per million as benzene (ppm; volume/volume). The instrument will be 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 will be noted on the boring logs. PID and OVM readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory analyses. Laboratory Procedures Selected soil and groundwater samples collected will be analyzed for the presence of total petroleum hydrocarbons calculated as gasoline (TPHg), benzene, toluene ethylbenzene, and xylenes (BTEX), and the fuel oxygenates methyl tertiary butyl ether (MtBE), ethyl tertiary butyl ether (EtBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB), 1-2 dichloroethane (1-2 DCA), methanol, and ethanol by EPA Method 8260B. Soil Cuttings and Purge Water Soil cuttings generated during drilling operations will be temporarily stored onsite in DOT- approved 55-gallon drums pending characterization and disposal. Soil cuttings will be removed to an appropriate offsite disposal facility if concentrations of the constituents of concern exceed levels appropriate for onsite use. Water generated during steam cleaning will be temporarily stored in DOT-approved 55-gallon drums pending transport to an appropriate disposal or treatment facility.