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1 <br /> 09 July 1999 <br /> AGE-NC Project No 95-0137 <br /> Page 2 of 4 <br /> purged of approximately 6 gallons of water Approximately 10 gallons of water per well were <br /> ' removed from the air sparging wells (VW-1 and VW-2) and 2 or 3 gallons of water were removed <br /> from each vapor extraction well (VW-1 and VW-2) <br /> Temperature, pH, and conductivity were measured at approximately two or one-gallon intervals <br /> using an ICM Water Analyzer Model No 5200 The field data sheets are included in Appendix A <br /> ' Purged water was stored on-site in 55-gallon drums <br /> ' 2 2 GROUND WATER SAMPLE COLLECTION <br /> After purging a minimum of three well-volumes of water from each well and a minimum of 80 % <br /> ' recharge recovery of the water level in the wells,water samples were collected from each well using <br /> new, clean, disposable plastic bailers The samples were transferred into 40-m1 EPA-approved <br /> volatile organic analysis(VOA) vials and into 1-liter amber bottles Samples were stored in a chilled <br /> ' container and transported under chain-of-custody to McCampbell Analytical Laboratories (MAI) in <br /> Pacheco, California,a State of California Department of Health Services(DHS)-certified laboratory <br /> Each sample was analyzed in accordance with the following <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline (TPH- <br /> g), <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as diesel (TPH-d), <br /> • EPA Method 8020 for benzene, toluene, ethylbenzene, and total xylenes (BTEX) and <br /> • EPA Method 8260 Modified for methyl-tert butyl ether (MTBE), tertiary butyl alcohol <br /> ' (TBA), di-isopropyl ether(DIPS), ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl <br /> ether (TAME) <br /> 1 <br /> 3.0. FINDINGS <br /> ' Ground water elevations and flow direction were calculated from field data and observation and <br /> petroleum-hydrocarbon impact was quantified through laboratory analysis of ground water samples <br /> ' collected over the last quarter <br /> Aihwnced GeoEmironmental,Inc <br /> 1 <br />