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18 July 2005 <br /> • AGE-NC Project No 97-0326 <br />' Page 2 of 5 <br /> I measured depth to ground water from the surveyed casing elevation(Table 1) Free-phase petroleum <br /> product was not observed in well MW-1 during the sampling event <br />' After water levels were measured, a Waterra inertia pump was used to purge each well <br /> Approximately 9 gallons of water(a minimum of three casing water volumes per well)were purged <br /> from single-level well MW-1, 5 5 gallons from single-level wells MW-2, MW-3, and MW-7, <br />' between 0 45 and 3 75 gallons were purged from multi-level wells 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 contamenzed 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 /> 2 2 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 />' 0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, and <br />' 0 Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and the fuel additives di-isopropyl <br /> ether(DLPE),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 /> 1 <br />' Advanced GeoEnvironmental,Inc <br />