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' 08 July 2003 <br /> • AGE-NC Project No 96-0229 <br />' Page 2of5 <br />' purge-volume intervals from each well using an Oakton water analyzer Field data and logs are <br /> included with Appendix B Purged ground water was contamenzed in 55-gallon drums and was <br /> stored on-site in an area lacking general public access <br /> 2 1 1 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 except from well MW-1 which was purged `dry' <br />' Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers,and transferred to 40-ml EPA-approved volatile organic analysis(VOA)vials containing 0 5 <br /> ml 18%hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles <br />' were not present in the vials after filling and capping Ground water sample containers were labeled <br /> with the well designation, date, time, and sampler's initials <br />' 2 12 Laboratory Analysis sis Of Ground Water Samples <br /> P <br />'. Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California DHS-certified laboratory for analysis for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method <br /> SW5030B/8015Cm, and <br />' • Benzene, toluene, ethylbenzene, xylenes (BTEX), ethylene dxbromide (EDB), 1,2- <br /> dichloroethane (1,2-DCA), tert-butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tert <br /> butyl ether(ETBE), tert amyl methyl ether(TAME) and methyl tert buyl ether(MTBE)by <br />' EPA Method 8260 Modified <br />' 3.0 FINDINGS <br /> Ground water monitoring field data was utilized to determine ground water flow direction and <br /> gradient Hydrocarbon impact to ground water was assessed and quantified by laboratory analysis <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the 25 February 2003 monitoring event, depths to ground water in wells MW-1 through <br /> • MW-12 were measured at between 29 84 and 3196 feet below the tops of the well casings(Table 2) <br /> IAdvanced GeoEnvtron mental,Inc <br /> 1 <br />