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30 August 2001 <br /> �. AGE-NC Project No 95-0130 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-I through VW-3 were allowed <br /> I to achieve a minimum of 80 percent recharge prior to sample collection, wells VW-2B and VW-3B <br /> were slow to recharge and sampled pnor to 80 percent recharge Ground water samples were <br /> collected from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 <br />' EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care <br /> was taken to ensure that visible air bubbles were not present in the vials after filling and capping <br /> Ground water sample containers were labeled with the well designation, date, time, and sampler's <br />' initials <br />' 23 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 /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> ISj • Total petroleum hydrocarbons quantified as gasoline (TPH-g ) by EPA Methods 5030/8015 <br /> Modified, <br />' • Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylene (BTEX) and <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, <br /> • Fuel oxygenated compounds - methanol ethanol tertiary butanol (TBA}, di-isopropyl ether <br /> (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA <br /> Method 8260 Modified, and <br /> • Lead scavengers - 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EBD) by EPA <br /> Method 8260 Modified <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 29 May 2001, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> IThe depths to ground water in wells MW-1 through VW-3 were measured between 36 38 and 37 57 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />