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5 <br /> I <br /> I12 November 1999 <br /> • AGE-NC Project No 95-0173 <br /> Page 2 of 5 <br /> volume intervals from each well using an ICM Model 52200 water analyzer Field data and logs are <br /> included with Appendix A Purged ground water was containerized in 55-gallon drums and was <br /> stored on-site in an area lacking general public access <br /> I <br /> 2 2 GROUND WATER SAMPLING <br /> Following purging,ground water levels in monitoring wells MW-1 through MW-12,VW-1,AW-1B <br /> and AW-2B were allowed to achieve a minimum of 80 percent recharge prior to sample collection <br /> Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers, one 1-liter amber bottle and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not <br /> present in the vials after filling and capping Ground water sample containers were labeled with the <br /> well designation, date, time, and sampler's initials <br /> I <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> 10 Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br />' of <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br />' respectively) by EPA Method 8015M/3550/5330, <br /> • Volatile aromatic compounds benzene, toluene, ethyl benzene and xylene (B I EX) with <br />' — methyl-tertiary butyl ether (MTBE) by EPA Method 8020, and - <br /> • Fuel oxygenated compounds tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert <br />' butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260M <br /> ?,n, FrNnrNrc <br /> AGE determined that ground water flow direction was toward the northeast at a gradient of 0 002 <br />' from the field data collected on 26 July 1999 Laboratory analysis of eleven ground water samples <br /> detected TPH-g and BTEX in eight samples, TPH-d in ten samples, MTBE in three samples and <br /> TBA in two samples <br /> Adianced CeoEnironmental,Inc <br /> 1 <br />