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' 02 August 2000 <br /> • 'AGE-NC Project No 95-0121 <br /> Page 2 of 7 <br /> e <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 µ <br /> new, disposable polyethylene bailers, three 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative and one-liter amber bottles without sample preservative <br /> I Care was taken to ensure that visible air bubbles were not present in the vials after filling and <br /> capping Ground water sample containers were labeled with the well designation, date, time, and <br /> 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 to be analyzed <br /> I for <br /> . • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) by EPA <br /> Methods 5030/8015M and 3550/8015M, respectively, and <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) and <br /> methyl-tertiary butyl ether (MTBE) by EPA Method 8020 <br /> I3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES <br /> Between 01 April and 30 June 2000 (second quarter 2000), SVE remediation was continued at the <br /> site by applying an induced vacuum to wells VW-3, VW-4, VW-5, VW-6, VW-7, VW-8 and-VW-9 <br /> (VW-3 through VW-9)utilizing a regenerative vacuum blower and two 55-gallon carbon canisters, <br /> I during this time, IAS remediation was continued at the site on wells AW-1, AW-2, AW-3, AW-4 <br /> and AW-5 (AW-1 through AW-5) SVE and IAS procedures for the site were described in a <br /> modification letter dated 04 February 2000, prepared by AGE and approved by the PHS-EHD by <br /> Iletter dated 07 February 2000 <br /> I3 1 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br /> I Between 1 April 2000 and 30 June 2000, the SVE and IAS remediation systems were operational <br /> at the site The SVE system utilized a regenerative vacuum blower and two 55-gallon carbon <br /> • canisters to extract and adsorb hydrocarbon vapor from the subsurface Two-inch diameter, schedule <br /> I <br /> Advanced GeaEnvironmental,Inc <br />