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' 24 May 2001 AGE-NC Project No 96-0254 ' Page 2 of 4 ' Temperature, pH and conductivity were measured at one- or two-gallon intervals The ground water parameters were measured with a Hydac 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 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' Water 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 ' 40-m1 VOA vials containing 0 5 ml 18% HCI as a sample preservative After collection, the samples were labeled and placed in a chilled container for transportation under chain-of-custody to I McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified analytical laboratory The ground water samples were analyzed for the following ' • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in accordance with EPA Method 8015 Modified • Volatile aromatic compounds - benzene, toluene, ethylbenzene and total xylenes (BTEX) in ' accordance with EPA Method 8020 • Fuel oxygenates, including, di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), ' methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether(TAME) and tertiary butyl alcohol (TBA) in accordance with EPA Method 8260 Modified I 3.0. FINDINGS ' Ground water elevation, flow direction, and gradient were determined from field data collected on 25 April 2001,the contaminant impact to ground water was quantified from the laboratory analytical Idata obtained from the sampling event ' 3 1 GROUND WATER ELEVATION AND GRADIENT The elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed well casing elevations (Table 1) The depths to ground water in wells MW-1 through MW-7 and GLMW-3 were measured between 6 87 feet and 8 61 feet below the tops of the well casings Ground water elevations at the site ranged . from 28 71 feet above mean sea level (MSL) in well GLMW-3 to 30 35 feet above MSL in well Advanced GeoEnvxronmental Inc