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I 21 December 2001 . AGE-NC Project No 96-0254 Page 2 of 4 • Monitoring well MW-7 was pumped dry after six gallons of water had been purged Temperature,pH and conductivity were measured at one-or two-gallon Intervals The ground water Iparameters were measured with an Oakton water analyzer Logs of the field data are Included In Appendix A Purged water was stored on-site In labeled DOT-approved 55-gallon drums I 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES lWater samples were collected from each well using a new disposable plastic bailer Each water sample was transferred Into one 1-liter amber bottle without a sample preservative and Into three I 40-m1 VOA vials containing 0 5 ml 18%HC1 as a sample preservative After collection,the samples were labeled and placed In a chilled container for transportation under chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified ' analytical laboratory The ground water samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) In Iaccordance with EPA Method 8015 Modified • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) In accordance with EPA Method 8020 • Fuel oxygenates, Including, di-isopropyl. ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether(TAME)and tertiary-butyl alcohol(TBA) In accordance with EPA Method 8260 Modified 3.0. FINDINGS I Ground water elevation, flow direction, and gradient were determined from field data collected on 24 October 2001, the contaminant Impact to ground water was assessed from the laboratory analytical data obtained from the sampling event 3 1 GROUND WATER ELEVATION AND GRADIENT I The elevation of ground water In each well was calculated b subtracting the depth to ground water 1�' Y g p from the surveyed well casing elevations (Table 1) i Advanced GeoEnvironmental Inc