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!� V <br /> ATTACHMENT A <br /> FIELD AND LABORATORY PROCEDURES (continued) <br /> S <br /> brated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor <br /> of 55, which relates the photo-ionization potential of benzene to that of isobutylene at <br /> 100 ppm. The results of the field-testing were noted on the boring logs. PID and OVM <br /> readings are useful for 'indicating relative levels of contamination, but cannot be used to <br /> evaluate hydrocarbon levels with the confidence of laboratory analyses. <br /> Laboratory Procedures <br /> Selected soil and groundwater samples collected were analyzed for the presence of total <br /> petroleum hydrocarbons calculated as gasoline (TPHg), benzene, toluene ethylbenzene, and <br /> xylenes (BTEX), and the fuel oxygenates methyl tertiary butyl ether (MtBE), ethyl tertiary <br /> butyl ether,(EtBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), tertiary <br /> butanol' (TBA), ethylene dibromide.(EDB), 1-2 dichloroethane.(1-2 DCA), methanol, and <br /> ethanol by EPA Method 8260B. <br /> Soil Cuttings and Purge Water <br /> Soil cuttings generated during drilling operations were temporarily stored onsite in DOT- <br /> approved 55 gallon drums pending characterization and disposal. Soil cuttings were <br /> analyzed and approved for use onsite. Water generated during steam 'cleaning was <br /> temporarily stored in DOT-approved 55-gallon drums pending transport to an appropriate <br /> disposal or treatment facility. <br /> E! <br /> y <br /> I 1 <br />