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24 August 2001 <br /> • AGE-NC Protect No 98-0448 <br /> Page 2 of 7 <br /> 2 2 GROUND WATER SAMPLING <br /> I <br /> Following well purging, ground water levels m the were allowed to achieve aminimum of 80 <br /> percent recharge prior to sample collection Ground water samples were collected from the purged <br /> wells utilizing new, disposable polyethylene bailers and three 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that <br /> visible air bubbles were not present in the vials after filling and capping Ground water sample <br /> containers were labeled 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,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> e Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Methods 5030/8015 <br /> . Modified, <br /> O Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, <br /> O 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 82.60 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 /> IBetween 16 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,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 infect air <br /> beneath the water table SVE and IAS procedures for the site were described in Remedial Acuon w <br /> Work Plan dated 07 July 2000, prepared by AGE, and approved by the PHS-EHD by letter dated 14 <br /> July 2000 <br /> Advanced CcoEnvironmental,Inc <br /> r � <br />