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11 August 2004 <br /> • AGE-NC Project No 95-0141 <br /> Page 2 of 5 <br /> purged dry prior to evacuating three casing-water volumes The wells were allowed to recharge prior <br /> to sampling <br /> Temperature,pH and conductivity of purged ground water were measured at regular purge intervals <br /> using an Oakton water analyzer The field data and field sheets are included in Appendix B Purged <br /> water was temporarily stored on-site in 55-gallon Department of Transportation (DOT)-approved <br /> H-17 storage drums pending proper disposal <br /> 2 1 2 Ground Water Sample Collection and Analysis <br /> Prior to the collection of ground water samples, the depth to ground water was re-measured in each <br /> well to ensure that a minimum of 80% of the initial water volume had recharged A water sample <br /> was then collected from each well from the discharge tubing or using a new, dedicated, disposable <br /> plastic bailer Immediately upon retrieval,the sample was transferred into three properly labeled 40- <br /> milliliter EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric <br /> acid as a sample preservative The samples were logged on a chain of custody form, stored 1n a <br /> chilled container and transported under chain of custody to Cal Tech Environmental Laboratories <br />' (CTEL), a California Department of Health Services (DHS)-certified laboratory, The ground water <br /> 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 /> • Di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl <br />' ether(TAME), tertiary-butyl alcohol (TBA), ethanol, methanol, 1,2-dibromoethane (EDB) <br /> and 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 on <br /> 17 June 2004 The contaminant impact to ground water was assessed from the laboratory analytical <br />' data collected on 17 June 2004 <br /> 1 <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />