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INN <br /> r S ECC1R <br />' ground surface The well casings were topped with a locking cap, and the well <br /> heads contained in water-tight traffic rated, flush mounted well boxes The boring <br />' logs show well construction details (Appendix C) <br />' Laboratory Procedures <br /> Selected soil and groundwater samples collected will be analyzed for the presence <br />' of total petroleum hydrocarbons calculated as gasoline (TPHg), benzene, toluene <br /> ethylbenzene, and xylenes (BTEX), and the fuel oxygenates methyl tertiary butyl <br /> ether (MtBE), ethyl tertiary butyl ether (EtBE), di-isopropyl ether (DIPE), tertiary <br />' amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB), 1-2 <br /> dichloroethane (1-2 DCA), methanol, and ethanol by EPA Method 8260B <br /> 1 <br /> Soil Cuttings and Purge Water <br /> Soil cuttings generated during drilling operations will be temporarily stored onsite in <br /> DOT-approved 55-gallon drums pending characterization and disposal Soil <br />' cuttings will be removed to an appropriate offsite disposal facility if concentrations of <br /> the constituents of concern exceed levels appropriate for onsite use Water <br /> generated during steam cleaning will be temporarily stored in DOT-approved 55- <br /> gallon drums pending transport to an appropriate disposal or treatment facility <br />' Organic Vapor Procedures <br /> Soil samples collected at 5-foot depth intervals during drilling will be analyzed in the <br />' field for ionizable organic compounds using a photo-ionization detector (PID) with a <br /> 10 2 eV lamp or an organic vapor meter (OVM) The test procedure will involve <br /> measuring approximately 30 grams from an undisturbed soil sample, and placing <br /> this sub-sample in a sealed container (either a zip-lock bag or a mason far) The <br /> container will be warmed for approximately 20 minutes (in the sun), then the head- <br /> space within will be tested for total organic vapor, measured in parts per million as <br />' benzene (ppm, volume/volume) The instrument will be calibrated prior to drilling <br /> using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55, which <br />' relates the photo-ionization potential of benzene to that of isobutylene at 100 ppm <br /> The results of the field testing will be noted on the boring logs PID and OVM <br /> readings are useful for indicating relative levels of contamination, but cannot be <br />' used to evaluate hydrocarbon levels with the confidence of laboratory analyses <br />