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' 02 November 2001 <br /> S AGE-NC Project No 95-0173 <br />' Page 2 of 8 <br /> entire well casing Approximately 1 gallon of ground water was removed from well MW-11 and 18 <br />' gallons were removed from well MW-13 before being pumped "dry" Temperature, pH and <br /> conductivity of purged water were measured from each well for stabilization at regular purge-volume <br /> Intervals using either an ICM, Oakton or Hydac water analyzer Field data and logs are included in <br /> fAppendix A Purged ground water was containerized In 55-gallon drums and was stored on-site in <br /> an area lacking general public access <br /> 1 <br /> 2 2 GROUND WATER SAMPLING <br />' Following well purging, ground water levels in the wells achieved a minimum of 80 percent recharge <br /> prior to sample collection Ground water samples were collected from the purged wells utilizing <br />' new, disposable polyethylene bailers and three 40-m1 EPA-approved VOA vials containing 0 5 ml <br /> 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br /> Iwith the well designation, date, time, and sampler's initials <br /> lie2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a cham-of-custody form, placed in a chilled container and <br />' transported to a Califomia 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 /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) and the <br /> oxygenated ether methyl-tertiary butyl ether (MTBE) by EPA Method 8020, <br /> • Fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert <br /> butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260 <br /> Modified, and <br /> • Lead scavenger compounds - 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) <br /> by EPA Method 8260 Modified <br /> 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES <br /> Between 01 April and 30 June 2001 (second 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 /> IVW-4, VW-5, VW-6 and VW-7 utilizing a Solleco Ecat 250 catalytic converter vapor extraction <br /> Advanced GeoEnvironmeutal,Inc <br />