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' 10 December 2001 <br /> �s <br /> AGE-NC Project No 9$-0448 <br />' Page 2 of 8 <br />' 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 except for well MW-4B which achieved only 56 percent <br /> recharge Ground water samples were collected from the purged wells utilizing new, disposable <br /> polyethylene bailers and three 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 /> 1 ' <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a sham-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,ethyl benzene and xylene(BTEX)with methyl-tertiary butyl ether(MTBE) <br /> Iby EPA Method 8020, <br /> • Fuel oxygenated compounds -methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether <br />' (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether(TAME) and MTBE by EPA <br /> Method 8260 Modified, and <br /> • 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 <br />' Modified <br />' 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PROCEDURES <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,VW-4 <br /> and VW-5 (VW-1 through VW-5)utilizing a regenerative vacuum blower and two 55-gallon carbon <br /> canisters, during this time, IAS remediation was continually operated at the site on wells AW-1, <br />' AW-2, AW-3 and AW-4 (AW-1 through AW-4) utilizing an electric air compressor to inject air <br />' Advanced GeoEnvironmental,Inc <br /> I <br />