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I14 February 2006 <br /> • AGE-NC Project No 95-0141 <br />' Page 2 of 5 <br />' MW-I IB, MW-I2B and EX-1 and 47 gallons of water were removed from well MW-13 Wells <br /> MW-6 and MW-913 were purged dry prior to the removal of three casing volumes, the wells were <br /> allowed to recharge prior to sampling <br />' Temperature,pH and conductivity of purged ground water was measured at regular purge intervals <br /> using an Oakton water analyzer The field sheets are included in Appendix B Purged water was <br />' temporarily stored on-site in 55-gallon Department of Transportation(DOT)-approved H-17 storage <br /> drums pending proper disposal <br /> I2 12 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 Immediately upon retrieval,the sample <br /> was transferred into three properly labeled 40-milliliter Environmental Protection Agency (EPA)- <br /> approved volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample <br /> preservative The samples were logged on a chain of custody form, stored in a chilled container and <br /> • transported under chain of custody procedures to Cal Tech Environmental Laboratories (CTEL), a <br /> California Department of Health Services (DHS)-certified laboratory, The ground water samples <br /> 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 (ETRE), 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 /> 03 November 2005 The contaminant impact to ground water was assessed from the laboratory <br /> analytical data dated 04-05 November 2005 <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />