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I <br />' 04 January 2002 <br /> AGE-NC Project No 95-0173 <br />' Page 2 of 8 <br />' within the entire well casing Approximately 1'/2 gallons of ground water were removed from well <br /> MW-1 I and 18 gallons removed from well MW-13 before being pumped "dry' Temperature, pH <br /> and conductivity of purged water were measured from each well for stabilization at regular purge- <br /> volume intervals using either an ICM, Oakton or Hydac water analyzer Field data and logs are <br /> included in Appendix A Purged ground water was containerized in 55-gallon drums and was stored <br /> on--site in an area lacking general public access <br /> 1 <br /> 2 2 GROUND WATER SAMPLING <br /> 1 Following well purging,ground water levels in the wells achieved a minimum of 80 percent recharge <br /> prior to sample collection except for wells MW-11 and MW-13 which had been purged "dry" <br />' Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers and 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acrd as a sample <br /> preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br />' filling and capping Ground water sample containers were Iabeled with the well designation, date, <br /> time, and sampler's initials <br /> 10 <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 clulled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory to be analyzed <br />' for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Methods <br /> 5030/8015M, <br /> • Benzene, toluene, ethyl benzene and xylene(BTEX) and methyl-tertiary butyl ether(MTBE) <br /> by EPA Method 8020, and <br />' • Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl <br /> methyl ether (TAME) and MTBE by EPA Method 8260 Modified, 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 Modified <br />' 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM <br /> Between 01 July and 30 September 2001 (third quarter 2001), an SVE remediation system was <br /> continually operated at the site by applying an induced vacuum to wells VW-1, VW-2, VW-3, <br /> VW-4, VW-5, VW-6 and VW-7 utilizing a Solleco Ecat 250 catalytic converter vapor extraction <br />' system, during this time, IAS remediation was continued at the site by air sparging through wells <br /> Advanced GeoEnvironmental,Inc <br /> I <br />