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' 08 June 2005 <br /> AGE-NC Project No. 95-0137 <br /> Page 3 of 6 <br /> • The fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether(TAME),tertiary butanol(TBA), 1,2-dichloroethane(1,2-DCA) <br /> and ethylene dibromide(EDB) in accordance with EPA Method 8260B. <br /> 2.1.5. Monitoring Well Development <br /> On 04 May 2005 monitoring wells MW-9 and MW-10 were developed utilizing a stainless steel <br /> ' hand bailer and an inertia pump. Ground water was purged from each monitoring well until ground , <br /> water was visually sediment free. Between fifteen and twenty gallons of water were removed from <br /> wells MW-9 and MW-10; representing nearly ten feet of the water column that.was purged from <br /> wells before achieving three casing-water volumes,suggesting slow recharge in these wells.Ground <br /> water temperature,pH and conductivity were measured at regular intervals during purging using an <br /> Oakton water analyzer. Field sheets and data are included in Appendix C. Purged water was stored <br /> ' on-site in properly labeled, 55-gallon Department of Transportation (DOT)-approved drums. <br /> ' . 2.2. WELL MONITORING AND EVACUATION <br /> A Solinst water level meter was used to measure the depth to ground water in monitoring wells <br /> 1 MW-1 through MW-10 relative to the tops of the well casings,prior to any well purging.The ground ` <br /> water elevations and gradient were determined from these data(Table IA. .�RGtJ'1 �,} <br /> 1 After recording water level measurements, disposable plastic bailers were used to purge the wells <br /> of standing water. Approximately 2 to 5.5 gallons of water (apinimurn of three casing water <br /> volumes per well)were removed from wells MW-1 through MW,.g`Ground water temperature,pH, <br /> Iand conductivity were measured at regular intervals during purging using an Oakton water analyzer. <br /> Purged ground water was containerized in properly labeled, DOT-approved 55-gallon drums and <br /> stored on-site. Field sheets and data are included in Appendix C. <br /> 2.3. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from the purged wells using new disposable plastic bailers <br /> after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Each <br /> sample was transferred into three,40-milliliter(ml)EPA-approved volatile organic analysis(VOA) <br /> vials and into one 1-liter amber bottle. Samples were properly labeled, stored in a chilled container, <br /> ' and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL),a California <br /> Department of Health Services(DHS)-certified laboratory,for analysis. Each sample was analyzed <br /> . for: <br /> ' Advanced GeoEnvironmental,Inc. <br /> 1 <br />