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1 ` <br /> 22 April 2002 <br /> AGE-NC Project No 98-0448 <br /> Page 2 of 8 ` <br /> well using an Oakton water analyzer Field data and logs are in Appendix A Purged ground water <br /> Iwas containerized in 55-gallon drums and was stored on-site in an area lacking general public access <br /> - `2 2' GROUND WATER SAMPLING <br /> Following well purging, ground water levels in the wells were allowed to achieve a minimum of 80 <br /> percent recharge prior to sample collection, the exception was well MW-413, which achieved only <br /> 48 percent recharge Ground water samples were collected from the purged wells utilizing new, <br /> disposable polyethylene bailers and 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Methods 5030/8015 <br /> Modified, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)with methyl tertiary-butyl ether(MTBE) <br /> Iby EPA Method 8020, <br /> • The fuel oxygenated compounds methanol, ethanol, tertiary butanol (TBA), di-isopropyl <br />' ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and MTBE by <br /> EPA Method 8260 Modified, and <br /> • 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 <br />' Modified <br /> 1A <br /> 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES <br /> Between 01 October and 31 December 2001 (fourth quarter 2001),an SVE remediation system was <br /> continually operated at the site by applying an induced vacuum to wells VW-1 through VW-5 <br /> utilizing a regenerative vacuum blower and two 80-gallon carbon canisters, during this time, IAS <br />' remediation was continually operated at the site on wells AW-1 through AW-4 utilizing an electric <br /> _ Advanced GeoEnvironmental,Inc <br /> 1 <br /> I ` <br />