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' 10 January 2003 <br /> • AGE-NC Project No 96-0229 <br />' Page 2 of 5 <br /> an Oakton water analyzer Field data and logs are included with Appendix B 6 Purged ground water <br />' was contamenzed in 5 5-gallon drums and was stored on-site in an area lacking general public access <br />' 2 2 GROUND WATER SAMPLING <br />' Following well purging, the ground water level from each well was allowed to achieve a minimum <br /> of 80 percent recharge prior to sample collection Ground water samples were collected from the <br /> purged wells utilizing new,disposable polyethylene bailers,and transferred to 40-m1 EPA-approved <br />' VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to <br /> ensure that visible air bubbles were not present in the vials after filling and capping Ground water <br /> sample containers were labeled 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, laced m a chilled container and <br /> �' P gg Y P <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> lie <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Method 5030/8015M, <br /> • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) <br /> by EPA Method 8020, and <br />' • Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tertiary butanol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and <br /> 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 /> 14 August 2002, the contaminant impact to ground water was quantified from the laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the 14 August 2002 monitoring event, depths to ground water in wells MW-1 through <br /> MW-10 were measured at between 29 52 and 31 60 feet below the tops of the well casings(Table 2) <br /> • Ground water elevations were calculated to be between 18 95 feet (MW-5) and 20 83 feet <br /> Advanced GeoEnviron mental,Inc <br />