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1 <br /> 20 June 2001 <br /> AGE-NC Project No 98-0432 <br />' Page 2 of 4 <br />' respectively Temperature,pH and conductivity of the purged water were measured at regular purge- <br /> volume intervals The field data was measured with an ICM model 52200 water analyzer Logs of <br /> the field data are included in Appendix A Purged water was stored on-site in labeled 55-gallon <br />' drums <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from each well using a new disposable plastic bailer Each <br /> water sample was transferred into three 40-m1 EPA-approved VOA vials containing 0 5 ml 18%HCl <br /> as a sample preservative and into one 1-liter amber bottle without preservative After collection, the <br /> ' samples were labeled and placed in a chilled container for transportation under chain-of-custody to <br /> McCampbell Analytical Laboratory(MAI) in Pacheco, California, a State of California Department <br /> of Health Services (DHS)Laboratory Each sample was analyzed for <br /> ' • Total petroleum hydrocarbons quantified as gasoline and 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) in <br /> accordance with EPA Method 8020, <br /> ' • Fuel additives,including tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tent-butyl <br /> ether (ETBE) and tert-amyl methyl ether (TAME), methyl tertiary-butyl ether (MTBE), <br /> methanol, ethanol, ethyl-dibromrde(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance <br /> ' with EPA Method 8260 Modified <br /> ' 3.0. FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 26 April 2001, the contaminant impact to ground water was quantified by the ground water sample <br /> laboratory analytical data <br /> 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> ' Ground water elevations in each well at the site were calculated by subtracting the measured depth <br /> to ground water from the surveyed well casing elevations (Table 1) Ground water elevations were <br /> ' plotted and contoured on a scaled site map (Figure 3) Depth to ground water at the site ranged from <br /> 13 76 to 14 93 feet below the well casing tops The ground water elevations at the site ranged from <br /> 23 19 feet to 23 37 feet above mean sea level(Table 1) Contours of the ground water elevation data <br /> indicate that the ground water flow is generally directed toward the northwest away from the former <br /> Advanced GeoEnvirononeotai,;ne <br /> 1 <br />