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30 May 2005 <br /> • AGE-NC Project No 95-0141 <br /> Page 2 of 5 <br /> to recharge prior 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 /> 1 <br /> 2 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 (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 /> 14 March 2005 The contaminant impact to groundwater was assessed from the laboratory analytical <br /> data collected on 14 March 2005 <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> iAt the time of the March 2005 monitoring event, depths to ground water ranged from 19 70 feet to <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />