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i r05 January 2006 AGE-NC Project No 97-0326 ' Page 2 of 5 I subtracting the measured depth to ground water from the surveyed casing elevation(Table 1) Free- phase petroleum product was not observed In well MW-1 during the sampling event After water levels were measured, a Waterra inertia pump was used to purge each well Approximately 9 0 gallons of water (a minimum of three casing water volumes per well) were purged from single-level well MW-1, 5 5 gallons were purged from single-level wells MW-2, ' MW-3,and MW-7,and between 0 4 and 4 0 gallons were purged from multi-level wells MW-BA-D and MW-9A-D Ground water temperature,pH,and conductivity were measured at regular intervals during purging using an Oakton water analyzer Purged ground water was containerized in properly labeled, Department of Transportation(DOT)-approved 55-gallon drums and stored on-site Field sheets and data are included in Appendix B 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each purged well using the dedicated inertia pump tubing, after • allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into three 40-milliliter(ml)volatile organic analysis(VOA)vials containing I 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, for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015M, and • Benzene,toluene,ethylbenzene,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-butyl alcohol (TBA), 1,2-dlbromoethane (EDB), 1,2-dichloroethane (1,2-DCA), methanol, and ethanol in accordance with EPA Method 8260B 3.0. FINDINGS Ground water elevation and flow direction were determined from field data Hydrocarbon-impact to ground water was Quantified by laboratory analysis of ground water samples Advanced GeoEnvironmental,Inc