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P. <br /> a ` <br /> ,.` 21 August 2000 <br /> AGE-NC Project No. 97-0327 <br /> Page 2 of 5 <br /> ' water was containerized in 55-gallon drums and was stored on-site in an area lacking general public <br /> access. <br /> 1 2.2. GROUND WATER SAMPLING <br /> ' Following well purging, ground water levels in monitoring wells MW-1, MW-2 and MW-3 were <br /> 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 sample preservative. Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping. Ground water sample containers were labeled <br /> 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 /> lie 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 /> Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE) and tert <br /> amyl methyl ether(TAME), and MTBE by EPA Method 8260 Modified. <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 19 May.2000; the contaminant impact to ground water was assessed from the laboratory data. <br /> 3.1. RELATIVE GROUND WATER ELEVATION AND GRADIENT <br />'• <br /> The depths to ground water in wells MW-1 MW-2 and MW-3 were between 45.03 and 46.54 feet <br /> below the tops of the well casings; ground water elevations at the site were calculated to be between <br /> Advanced GeoEnvironmental,Inc. <br />