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i I06 October 2005 AGE-NC Project No 99-0657 Page 3 of 6 were purged by lowering and raising a 518-inch outer diameter, length-discrete polyethylene hose Iequipped with a ball-valve water tip through the top chambers into the specific water-charged screened section A Waterra Hydro-Lift II pump equipped with a mechanical arm was utilized to surge each well with a polyethylene hose Approximately 4 5 to 6 5 gallons of water(a minimum of ' three casing-water volumes per well)were removed from wells MW-1 through MW-6 and MW-9, approximately 45 gallons of water were removed from wells MW-10 and MW-1 I Ground water I temperature, pH, and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix C Purged water was stored on-site in properly labeled Department of Transportation (DOT)-approved model 17H 55-gallon drums 2 2 2 Collection and Analysis of Ground Water Samples Water samples were collected from each purged well using a new disposable plastic bailer after I allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into one 1-liter amber bottle without sample preservative and into three 40-milliliter (in[) volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid . solution as a sample preservative After collection, the samples were properly labeled, placed in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)-certified analytical laboratory, Ifor analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in ' accordance with EPA Method 8015 Modified, and • Benzene, toluene, ethyl-benzene, and total xylenes (BTEX) and the fuel additives di- isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260E 1 ' 3.0. FINDINGS The ground water elevation, flow direction, and gradient were determined from field data collected ' on 25 April 2005, the contaminant impact to ground water was quantified by the laboratory analytical data I ' • ' Advanced GeoEnvironmentai,Inc