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i 08 January 2001 AGE-NC Project No 97-0249 ' Page 2 of 5 containerized in 55-gallon drums and was stored on-site in an area lacking general public access ' 2 2 GROUND WATER SAMPLING Following well purging, ground water levels in monitoring wells MW-1 through MW-6 were allowed to achieve a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers, one 1-liter amber bottle without a sample preservative and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's Initials 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES IEach ground water sample was logged on a chain-of-custody form, placed in a chilled container and transported to a California Department of Health Services (DHS)-certified laboratory for analysis for o Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively)by EPA Methods 5030/8015 Modified and 3550/8015 Modified, respectively, Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and • Fuel oxygenated compounds - methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether I (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260 Modified 3.0 FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 13 December 2000, the contaminant Impact to ground water was assessed from the ground water ' laboratory data 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1 through MW-6 were measured between 9 10 and 12 21 Advanced GioEnvironmental,Inc