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' 31 May 2000 <br /> AGE-NC Project No 97-0301 <br /> ' Page 2 of 4 <br /> ' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-1,MW-2, MW-3 and MW4 <br /> t were allowed to achieve a minimum of 80 percent recharge prior to sample collection Ground water <br /> samples were collected from the purged wells utilizing new, disposable polyethylene bailers, one <br /> 1-liter amber bottle without a preservative and four 40-m1 EPA-approved VOA vials containing 0 5 <br /> ' ml 18%hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> 1 <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> ' transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> '• • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Method 8015M, <br /> ' • Volatile aromatic compounds benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether(MTBE)by EPA Method 8020, and <br /> • Fuel oxygenated compounds tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert <br /> ' butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260M <br /> ' 3.0. FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 10 March 2000, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1, MW-2, MW-3 and MW-4 were measured between <br /> 24 83 and 25 72 feet below the tops of well casings, ground water elevations were calculated to be <br /> between 2162 feet and 2190 feet below mean sea level Ground water elevation at the site increased <br /> • an average 4 27 feet between the December 1999 and the March 2000 ground water monitoring <br /> ' events The ground water elevation data for MW-1, MW-2, MW-3 and MW-4 during the February <br /> Advanced CeoEnvironmental,Inc <br />