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27 June 2002 <br />` AGE-NC Project No 98-0448 <br /> Page 2 of 8 <br />' intervals from each well utilizing an Oakton water analyzer Field data and logs are included with <br /> Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in <br /> an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging, the ground water level in each well was allowed to achieve a minimum of <br /> 80 percent recharge prior to sample collection, except for well MW-4B, which was purged "dry" <br /> Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers and transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric <br /> acid as a sample preservative Care was taken to ensure that visible air bubbles were not present in <br /> the vials after filling and capping Ground water sample containers were labeled with the well <br /> 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 /> by EPA Method 8020, <br /> • The fuel oxygenated compounds methanol, ethanol, tertiary butanol (TBA), di-isopropyl <br /> ether(RIPE), 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 /> IModified <br /> I3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES <br /> Between 01 January and 31 March 2002 (first quarter 2002), an SVE remediation system was <br /> continually operated at the site by applying an induced vacuum to wells VW-1 through VW-5 <br /> • Advanced GeoEnvironmental,Inc <br />