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11 May 2004 <br /> AGE-NC Project No 95-0141 <br /> Page 2 of 5 <br /> wells Approximately 4 5 to 15 gallons of water were removed from shallow-screened wells <br /> MW-3, MW-5, MW-7 and MW-8A through MW-12A, approximately 22 gallons of water were <br /> removed from deep-screened wells MW-8B through MW-12B and 28 25 gallons were removed <br /> from well EX-1 Well MW-6 was purged dry prior to evacuating three casing-water volumes <br /> The well was allowed to recharge prior to sampling <br /> Temperature, pH and conductivity of purged ground water were measured at regular purge <br /> intervals using an Oakton water analyzer The field data and field sheets are included in <br /> Appendix B Purged water was temporarily stored on-site in 55-gallon Department of <br /> Transportation (DOT)-approved H-17 storage drums pending proper disposal <br /> 2 12 Ground Water Sample Collection and Analysis <br /> Pnor to the collection of ground water samples, the depth to ground water was re-measured in <br /> each well to ensure that a minimum of 80% of the iintial water volume had recharged A water <br /> sample was then collected from each well from the discharge tubing or using a new, dedicated, <br /> disposable plastic bailer Immediately upon retrieval, the sample was transferred into three <br /> • properly labeled 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml <br /> 18%hydrochloric acid as a sample preservative The samples were logged on a chain-of-custody <br /> form, stored in a chilled container and transported under chain-of-custody to Cal Tech <br /> Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified <br /> laboratory, The ground water samples were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> Benzene, toluene, ethylbenzene and total xylenes(BTEX)in accordance with EPA Method <br /> 8260B, and <br /> I <br /> Di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl <br /> ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB) and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected <br /> on 30 March 2004 The contaminant impact to ground water was assessed from the laboratory <br /> analytical data collected on 30 March 2004 <br /> Advanced GeoEnvironmental,Inc <br />