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EU ._ t <br /> • 20 April 2005 <br /> AGE-NC Project No 95-0109 <br /> Page 2 of 6 <br /> removed from the wells that were purged by the Waterra inertial pump and 30 gallons were removed <br /> from well EW-1 MW-1 through MW-6 and MW-8 drew down before the full purge volume was <br /> 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 A The purged water was containenzed in 55-gallon <br /> DOT-approved drums and stored on-site <br /> 2 2 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-1 through MW-6 and MW-14 using a disposable plastic bailer, from EW-1 using a <br /> Grundfos Pump and from the remaining wells using the Waterra Inertial Pump Immediately upon <br /> retrieval, the samples were transferred mto 40-m1 EPA-approved volatile organic analysis (VOA) <br /> vials containing 0 5-ml 18%hydrochloric acid as a sample preservative and 1,000 ml plastic bottles <br /> The samples were labeled, stored on ice, and transported in a chilled container, under chain of <br /> custody, to CalTech Environmental Laboratories (CTEL) of Paramount, a State of California <br /> 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 including benzene,toluene,ethylbenzene and xylenes(BTEX), <br /> and the fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA <br /> Method 8260B <br /> Additionally, ground water samples collected from wells EW-I and MW-14 were analyzed for <br /> • pH by EPA method 150 1, <br /> • Conductivity by EPA Method 120 1, <br /> • Total dissolved solids (TDS) in accordance with EPA Method 160 1, <br /> Advanced GeoEnvironmental,Inc <br />