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' 18 September 2003 <br /> . AGE-NC Project No 96-0254 <br />' Page 2 of 4 <br />' three casing-water volumes per well Temperature, pH and conductivity were measured at one- or <br /> two-gallon intervals with an Oakton water analyzer Logs of the field data are included in <br /> Appendix B Purged water was stored on-site in labeled DOT-approved 55-gallon drums <br /> 2 3 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' The depth to ground water was re-measured in each well following evacuation to assure a minimum <br /> p �' g <br />' of 80%recharge prior to sampling Water samples were subsequently collected using new disposable <br /> plastic bailers from wells MW-1 through MW-7 The water sample from each well was transferred <br /> into three chilled 40-m1 volatile organic analysis (VOA)vials containing 0 5 ml 18% hydrochloric <br />' acid(HCl)as a sample preservative and into one 1-liter amber bottle without a sample preservative <br /> After collection,the samples were labeled and placed in a chilled container for transportation under <br />' chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California Department of <br /> Health Services(DHS)-certified analytical laboratory The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015-Modified <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX)in accordance with EPA Method <br />' 8260B <br /> • Fuel additives, including, di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), <br />' methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl <br /> alcohol(TBA), 1,2-dibromoethane(EDB)and 1,2-dicholoroethane(1,2-DCA)in accordance <br /> with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation flow direction and gradient were determined from field data collected <br /> I onl 6 July2003 The contaminant impact to groundwater was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> I3 1 GROUND WATER ELEVATION AND GRADIENT <br /> I The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) <br /> I <br /> Advanced CeoEnvironmental Inc <br /> I <br />