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19 September 2001 <br /> AGE-NC Project No 96-0254 <br /> Page 2 of 4 <br /> • Monitoring well MW-7 was pumped dry after six gallons of water had been purged <br />' Temperature,pH and conductivity were measured at one-or two-gallon intervals The ground water <br /> parameters were measured with an Oakton water analyzer Logs of the field data are included in <br /> Appendix A Purged water was stored on-site in labeled DOT-approved 55-gallon drums <br /> I <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> IWater samples were collected from each well using a new disposable plastic bailer Each water <br /> sample was transferred into one 1-liter amber bottle without a sample preservative and into three <br /> I40-m1 VOA vials containing 0 5 ml 18%HCl as a sample preservative After collection,the samples <br /> were labeled and placed in a chilled container for transportation under chain-of-custody to <br /> McCampbell Analytical, Inc (MAT), a California Department of Health Services (DHS)-certified <br /> 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 /> • Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes(BTEX)and <br /> Imethyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020 <br /> • Fuel oxygenates, including, di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), <br />' MTBE, tertiary-amyl methyl ether(TAME)and tertiary-butyl alcohol (TBA)in accordance <br /> with EPA Method 8260 Modified <br /> I <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 27 July 2001, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> 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 GcoEnvironmental Inc <br />