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13 December 1999 <br /> AGE-NC Project No 95-0173 <br />' Page 2 of 5 <br />' well Approximately 1 5 gallons of ground water were removed from well MW-I1 before be,ng <br /> pumped"drys' Temperature, pH and conductivity were measured for stabilization at regular purge- <br /> volume intervals from each well using a Hydac and an ICM Model 52200 water analyzer Field data <br />' and logs are included with Appendix A Purged ground water was containenzed in 55-gallon drums <br /> and was stored on-site in an area lacking general public access <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 I-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 present <br /> in the vials after filling and capping Ground water sample containers were labeled with the well <br />' designation, date, time, and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />' Each ground water sample was logged on a cham-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <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 (BTEX) with <br /> methyl-tertiary butyl ether (MTBE) by EPA Method 8020, and <br />' • Fuel oxygenated compounds tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert <br /> butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260M <br /> 3.0. FINDINGS <br />' AGE determined that ground water flow direction was toward the northeast at a gradient of 0 003 <br /> from the field data collected on 18 October 1999 Laboratory analysis of fifteen ground water <br /> samples detected TPH-g in nine samples, TPH-d in ten samples, BTEX in eleven samples, MTBE <br /> . in five samples and TBA in six samples <br />' Advanced Gco Environmental,Inc <br /> I <br />