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ii <br /> . 16 May 2001 <br /> AGE-NC Protect No 96-0229 <br /> Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels from each well achieved a minimum of 80 percent <br /> recharge prior to sample collection Ground water samples were collected from the purged wells <br /> utilizing new, disposable polyethylene bailers and three 40-m1 EPA-approved VOA vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air <br /> bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <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 petrolewn hydrocarbons quantified as gasoline(TPH-g)by EPA Method 5030/8015M, <br />� . • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) and <br /> methyl-tertiary butyl ether(MTBE)by EPA Method 8020, and <br /> I C Fuel oxygenated compounds-methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether <br /> (RIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether(TAME) and MTBE by EPA <br /> Method 8260 <br /> 3.0. FINIDINGS <br /> Ground water elevation flow direction andgr adient were determined from field data collected on <br /> 27 March 2001, the contaminant impact to ground water was assessed from the laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the 27 March 2001 monitoring event, depths to ground water from wells MW-1 through <br /> MW-10 were measured between 26 21 and 27 96 feet below the tops of the well casings, ground <br /> water elevations were calculated to be between 15 64 feet and 16 90 feet below mean sea level <br /> Ground water elevation at the site increased an average 0 24 feet between the December 2000 and <br /> the March 2001 ground water monitoring events,however, decreasing ground water elevations were <br /> observed at the Site between April and December 2000 (Table 1) The ground water elevation data <br /> for MW-I through MW-10 during the March 2001 ground water monitoring event is depicted and <br /> Advanced GeoEnviron mental,Inc <br />