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19 July 2004 <br /> AGE-NC Project No 95-0109 <br /> Page 4 of 7 <br /> Between 5 25 and 8 0 gallons of water were removed from wells that were purged by disposable <br /> bailers Approximately 4 0 to 29 gallons were removed from the wells that were purged by the <br /> Waterra inertial pump MW-9 and MW-22 drew down before the full purge volume was reached <br /> Temperature, pH and conductivity of the purge water were measured at regular purge-volume <br /> intervals using an Oakton water analyzer and the readings were recorded on field logs Field data and <br /> work sheets are included in Appendix E The purged water was containerized in 55-gallon <br /> DOT-approved drums and stored on-site <br /> 2 6 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> The depth to water was re-measured after purging to ensure a minimum of 80 percent recharge of <br /> the initial water level in each well prior to sampling Afterwards,water samples were collected from <br /> wells MW-7,MW-11 and MW-14 using the disposable plastic bailers and from the remaining wells <br /> using the Waters Inertial Pump Immediately upon retrieval,the samples were transferred into 40-m1 <br /> EPA-approved volatile organic analysis (VOA) vials containing 0 5-ml 18% hydrochloric acid as <br /> a sample preservative <br /> The 19 April 2004 set of ground water samples were labeled, stored on ice, and transported in a <br /> chilled container,under chain-of-custody,to McCampbell Analytical Inc (MAI)of Pacheco,a State <br /> of California Department of Health Services-certified analytical laboratory <br /> The 26 June 2004 samples were labeled, stored on ice,and transported in a chilled container,under <br /> chain-of-custody, to Cal Tech Environmental Laboratories (CTEL) of Paramount, a State of <br /> California Department of Health Services-certified analytical laboratory <br /> All ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015M, and <br /> • Volatile organic compounds (basic target list) in accordance with EPA Method 8260B <br /> The basic target list includes benzene, toluene, ethylbenzene and xylenes (BTEX), and the fuel <br /> additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether <br /> (MTBE),tertiary-amyl methyl ether(TAME),tertiary butanol(TBA), 1,2-dichloroethane(1,2-DCA) <br /> and ethylene dibromide (EDB) <br /> Advanced GeoEnvironmental,Inc <br />