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' 04 November 2002 iAGE-NC Project No 97-0301 ' Page 2 of 5 2 2 GROUND WATER SAMPLING Following well purging, ground water levels at all wells achieved a minimum of 80 percent recharge ' prior to sample collection Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers and transferred into 1-liter amber bottles without sample preservative and 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochlonc 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 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES ' Following collection and labeling, each 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 ie • Total petroleum hydrocarbons quantified as gasoline, diesel,kerosene and motor oil (TPH-g, TPH-d, TPH-k and TPH-mo respectively)by EPA Methods 8015M/5030/3510, • Benzene, toluene, ethyl benzene and xylene (BTEX) and methyl tertiary-butyl ether(MTBE) ' by EPA Method 8020, and • Methanol, ethanol, 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EBD), di-isopropyl ' ether (DIPE), ethyl tert butyl ether (ETBE), MTBE, tert amyl methyl ether(TAME), tertiary butanol (TBA)by EPA Method 8260M 1 3.0. FINDINGS ' Ground water elevation, flow direction and gradient were determined from field data collected on 03 June 2002, the contaminant impact to ground water was quantified by the ground water laboratory data 3 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1 through MW-7 were measured at between 28 99 and ' 29 70 feet below the tops of well casings,ground water elevations were calculated to be between 16 65 feet(MW-2 and MW-6) and 16 85 feet(MW-5)below mean sea level Ground water elevation at the . site decreased an average 0 30 feet between the March 2002 and the June 2002 ground water monitoring ' Advanced GeoEnvironmental,Inc I' 1