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' 13 November 2002 • AGE-NC Project No 97-0249 Page 2 of 5 at regular purge-volume Intervals from each well using an Oakton water analyzer Field data and logs are in Appendix B Purged ground water was containerized in 55-gallon drums and was stored on- site in an area lacking general public access 2 2 GROUND WATER SAMPLING Following well purging, ground water levels from each well 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 to 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber bottles without 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 I 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES � . 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 I for • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) by EPA Methods 8015C Modified, • Benzene, toluene, ethyl benzene and xylenes (BTEX) and methyl-tertiary butyl ether (MTBE) by EPA Method 8021 B, and I • Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tertiary butanol (TBA), di- isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and IMTBE by EPA Method 8260B I3.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 04 September 2002,the contaminant impact to ground water was assessed from laboratory analysis of the ground water samples collected on 05 September 2002 I IAdvanced GeoE nviron mental,Inc I