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1 <br />' 29 August 2001 <br /> AGE-NC Project 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 /> I 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 petroleum 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 /> G 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. FINDINGS <br />' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 26 June 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 26 June 2001 monitoring event, depths to ground water in wells MW-1 through MW-10 <br /> were measured between 26 99 and 28 75 feet below the tops of the well casings, ground water <br /> elevations were calculated to be between 16 42 feet and 17 87 feet below mean sea level Ground <br /> water elevation at the site decreased an average 0 84 feet between the March 2001 and the June 2001 <br /> ground water monitoring events, generally,decreasing ground water elevations were observed at the <br /> site between April and June 2001 (Table 1) The ground water elevation data for MW-1 through <br /> MW-10 during the June 2001 ground water monitoring event is depicted and contoured in Figure <br /> IAdvanced GeoEnvironmental,Inc <br />