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I <br /> I <br /> 05 November 2005 <br /> . AGE-NC Project No 97-0326 <br />' Page 2 of 5 <br /> subtracting the measured depth to ground water from the surveyed casing elevation(Table 1) Free- <br /> phase petroleum product was not observed in well MW-1 during the sampling event <br /> 1 After water levels were measured, a Waterra inertia pump was used to purge each well <br /> Approximately 9 5 gallons of water (a minimum of three casing water volumes per well) were <br /> purged from single-level well MW-1, 6 0 gallons were purged from single-level wells MW-2, <br /> 1 MW-3, and MW-7, and between 0 45 and 3 75 gallons were purged from multi-level wells <br /> MW-8A-D and MW-9A-D <br />' Ground water temperature,pH,and conductivity were measured at regular intervals during purging <br /> using an Oakton water analyzer Purged ground water was containerized in properly labeled, <br /> Department of Transportation(DOT)-approved 55-gallon drums and stored on-site Field sheets and <br />' data are included in Appendix B <br />' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using the dedicated inertia pump tubing, after <br />' allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into three 40-milliliter(ml)volatile organic analysis (VOA)vials containing <br /> 0 5 ml 18%hydrochloric acid solution as a sample preservative After collection,the samples were <br />' properly labeled,placed in a chilled container, and transported under chain of custody to Cal Tech <br /> Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory, for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 8015M, and <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and the fuel additives di-Isopropyl <br /> ether(DIPE),ethyl-tertiary-butyl ether(ETBE),methyl-tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB), <br /> 1,2-dichloroethane (1,2-DCA), methanol, and ethanol in accordance with EPA Method <br />' 8260B <br />' 3.0. FINDINGS <br /> Ground water elevation and flow direction were determined from field data Hydrocarbon-impact <br />' to ground water was quantified by laboratory analysis of ground water samples <br />' Advanced GeoEnviron mental,Inc <br /> I <br />