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' 15 August 2005 AGE-NC Project No 97-0300 ' Page 2 of 4 2 2 GROUND WATER SAMPLING Following well purging, the ground water level in the monitoring wells were allowed to achieve a ' minimum of 80 percent recharge prior to sample collection Ground water samples were collected from MW-1 and MW-2 utilizing new,disposable polyethylene bailers and from MW-3 using both the new polyethylene bailer and a stainless steel bailer, and transferred to one 1-liter amber bottles ' without a preservative and 40-m1 EPA-approved volatile organic analysis (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 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sle was gged on a chain-of-custody form,placed in a chilled container and ' transported to er-atory (CAL), a California Department of Health Services (DHS)-certified laboratory (#24M for analysis for VM 41 Ix3 t ` - Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d and TPH-mo, respectively) by EPA Method 8015M, ' - Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by EPA Method 8260, ' - Ethylene dibromide(EDB), 1,2-dichloroethane(1,2-DCA), tert-butanol(TBA),di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME) and me+lt4md MTBE by EPA Method 8260 "t'"°f J I ' 3.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on ' 07 April 2005, the contaminant Impact to ground water was assessed from the ground water laboratory data 3 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1, MW-2 and MW-3 were measured between 48 26 and ' 48 88 feet below the tops of the well casings Ground water elevations at the site were calculated to be between 31 10 feet and 31 17 feet below mean sea level, groundwater elevations are depicted In Figure 3 On 07 April 2005, the general ground water flow direction at the site was inferred to be Advanced GeoEnvironmental,Inc