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' 18 November 2005 <br /> AGE-NC Project No 03-1100- <br /> Page <br /> 3-1100Page 2 of 4 <br /> new, disposable plastic bailer Approximately 3 25 to 4 5 gallons of water (a minimum of three <br />' casing-Water volumes) were removed from each well Ground water temperature, pH, and <br /> conductivity were measured at regular intervals during purging using an Oakton water analyzer <br />' <br /> 'Field sheets and data are included in Appendix A Purged water was stored on-site in appropriately <br /> labeled, 55-gallon Department of Transportation (DOT)-approved drums pending proper disposal <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br />' Water samples were collected from the purged wells using new, disposable plastic bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into four 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, Inc (CTEL) for analysis The 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 xylenes (BTEX) in accordance with EPA Method <br /> 8260B, and <br />' G Fuel oxygenates methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME),tertiary butanol(TBA), 1,2- <br /> dichloroethane(1,2-DCA),and ethylene dibromide(EDB)in accordance with EPA Method <br />' 8260B " <br />' 3.0. FINDINGS <br /> , <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 12 May 2005 The contaminant impact to ground water was quantified by laboratory analytical data <br /> I <br /> 3 ,l GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 3 <br />' At the time of the May 2005 sampling'event, depths to ground water ranged from 4156 feet to <br /> 43 01 feet below the tops of the well casings, indicating that the wells are screened properly and <br />' yield representative shallow ground water samples <br /> Ground water elevation at rthe site ranged from 22 10 feet below mean sea level (MSL) in well <br />' Advanced GeoEnvironmental,Inc <br /> r <br />