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• detector (PID) with a 10.2 eV lamp_ The test procedure involved measuring approximately <br /> 30 grams from an undisturbed soil sample, placing this subsample in a ziplock type bag or in <br /> a cican glass jar, and sealing the jar with aluminum foil secured under a ring-type threaded <br /> lid. The container was warmed for approximately 20 minutes (in the sun), then the head- <br /> space within the container was tested for total organic vapor, measured in parts per million as <br /> benzene (ppm; volume/volume). The instrument was calibrated prior to drilling using a <br /> 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 were noted on the boring logs. PID readings are useful for indicating relative <br /> levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confi- <br /> dence of laboratory analyses. <br /> Soil Cuttings and Purge Water <br /> Soil cuttings generated during drilling operations were temporarily stored on site and covered <br /> with plastic sheeting pending characterization and disposal. Soil cuttings were removed by a <br /> certified disposal contractor to an appropriate disposal facility. Water generated during steam <br /> cleaning, and development and sampling of the new wells was temporarily stored in DOT- <br /> approved 55-gallon drums pending transport by an independent disposal contractor to an <br /> appropriate disposal or treatment facility. <br /> Laboratory Procedures <br /> The groundwater samples were analyzed for the presence of TPH-g, BTEX, MtBE by <br /> EPA Method 8020. In addition, groundwater samples were analyzed for the presence of fuel <br /> oxygenates by EPA Method 8260. These analyses were performed by utilizing a purge and <br /> trap extraction technique, with final detection by gas chromatography using flame- and <br /> photo-ionization detectors. The methods of analysis for the groundwater samples were docu- <br /> mented in the certified analytical report. <br /> 920-078.1A/5OLGWRPT A-2 November 24, 1997 <br />