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' 06 December 2000 <br /> AGE-NC Project No 95-0173 <br /> Page 2 of 7 <br />' removed from well MW-11 and 16 gallons from MW-13 before being pumped"dry" Temperature, <br /> pH and conductivity were measured from each well for stabilization at regular purge-volume <br /> intervals using a Hydac water analyzer Field data and logs are included in Appendix A Purged <br />' ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general <br /> public access <br /> I2 2 GROUND WATER SAMPLING <br /> I 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 four 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 /> with 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 laced in a chilled container and <br /> � p gg Y �p <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 <br /> t <br /> 5030/8015M, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br />' 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), 1,2-dichloroethane(1,2-DCA), ethylene <br /> dibromide (EDB), MTBE, methanol and ethanol by EPA Method 8260 Modified <br /> 3.0 SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES <br />' Between 01 July and 04 October 2000, SVE remediation was continued at the site by applying a <br /> vacuum to wells VW-1,VW-2, VW-3,VW-4,VW-5, VW-6 and VW-7 utilizing a Solleco Ecat 250 <br /> catalytic converter vapor extraction system, during this time, IAS remediation was continued at the <br /> site on wells MW-1, MW-2, MW-3, AW-1, AW-2, AW-3, AW-4, AW-5, AW-6 and AW-7 SVE <br /> and IAS procedures for the site were described In Remedial Action Work Plan dated 30 December <br />' Advanced GeoEnvironmental,Inc <br />