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r <br /> ' 10 February 2005 <br /> . AGE-NC Project No 98-0521 <br /> ' Page 2 of 6 <br /> 23 gallons of water were removed from well MW-5 utilizing a Waterra Inertial pump Temperature, <br /> ' pH and conductivity were measured for stabilization at regular purge-volume Intervals for each well <br /> using an Oakton water analyzer Field sheets are included in Appendix B Purged water was stored <br /> ' on-site in 55-gallon, Department of Transportation(DOT)-approved drums <br /> 2 12 Collection and Analysis of Ground Water Samples <br /> r <br /> Prior to collection of ground water samples,the depth to ground water was measured again in wells <br /> ' MW-I, and MW-3 through MW-5 to ensure that a minimum of 80%of the Initial well volume had <br /> recharged Afterwards, a water sample was collected from wells MW-I, MW-3 and MW-4 using <br /> disposable plastic bailers,and a water sample was collected from MW-5 utilizing 518-inch diameter <br /> polyethylene Waterra tubing <br /> The ground water samples were transferred into three 40-m1 volatile organic analysis (VOA) vials <br /> containing 0 5 ml hydrochloric acid(18%)as a sample preservative The samples were then labeled <br /> and placed in a chilled container for transportation under chain of custody to Cal Tech <br /> Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified <br /> . laboratory The collected ground water samples were analyzed for the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> ' Method 8015M, <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-Isopropyl <br /> ether(RIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-buty ether(MTBE),tertiary- <br /> amyl methyl ether(TAME),tertiary butanol (TBA), ethanol,methanol, 1,2-dibromoethane <br /> (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 1 <br /> 22 GROUND WATER EXTRACTION REMEDIATION <br /> 1 <br /> Between 04 August and 27 September 2004, a ground water extraction interim remediation system , <br /> ' was in continuous operation at the site The interim ground water extraction system operation and <br /> maintenance procedures for the site were outlined in the AGE-prepared Interim Remediation/ <br /> Additional Site Assessment Work Plan,dated 15 May 2003 Field notes are included in Appendix C <br /> 1 <br /> 2 2 1 Ground Water Remediation System <br /> ' The ground water treatment system is designed to operate at a maximum flow rate of up to <br /> • <br /> ' Advanced GeoEnvrronmental,Inc <br /> 1 <br />