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02 February 2000 <br /> i AGE-NC Project No 97-0249 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following purging, ground water levels in monitoring wells MW-1 through MW-6 were allowed to <br /> achieve a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected from the purged wells utilizing new, disposable polyethylene bailers, one 1-liter amber <br /> bottle without a preservative and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not present <br /> in the vials after filling and capping Ground water sample containers were labeled with the well <br /> 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 clulled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> Ifor <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 /> From the field data collected on 21 November 1999, ground water flow direction was determined <br /> to be generally toward the east at a gradient of 0 0009 Laboratory analysis of six ground water <br /> samples detected TPH-g, TPH-d and BTEX in five samples, MTBE was detected in four samples <br /> No constituents of concern were detected from grab water samples collected from the onsite <br /> domestic drinking water well <br /> I3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> I During the November 1999 monitoring event, depths to ground water in wells MW-1 through MW-6 <br /> were measured between 9 59 and 12 84 feet below the tops of well casings, ground water elevations <br /> were calculated to be between 2 82 feet and 3 09 feet below mean sea level Ground water elevation <br /> Advanced GeoEnvironmental,Inc <br /> I <br />