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' 30 December 1999 <br /> AGE-NC Project No 95-0104 <br /> Page 2 of 7 <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-1, MW-5, MW-6 and VW-1 <br /> achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 EPA- <br /> approved VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative Care was taken to <br /> ensure that visible air bubbles were not present in the vials after filling and capping Ground water <br /> sample 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 /> of <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, <br />'. • Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with <br /> methyl-tertiary butyl ether (MTBE) by EPA Method 8020, and <br />' • Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl <br /> methyl ether (TAME) and MTBE by EPA Method 8260M <br /> I <br /> 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE PILOT TEST PROCEDURES <br />' Between 27 August and 14 December 1999, a SVE pilot test was continued at the site by applying <br /> a vacuum at well VW-1, during this time, a total of ten extracted soil gas samples were collected at <br />' the inlet of the SVE unit SVE pilot test procedures for the site were outlined in a letter work plan <br /> dated 02 June 1998 prepared by AGE and approved by the PHS-EHD by letter on 15 June 1998 <br />' <br /> 31 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br />' Between 27 August 1999 and 14 December 1999, an SVE pilot test was continued at the site The <br /> SVE pilot test was performed to provide additional SVE data for feasibility analysis, provide <br />' immediate protection to the nearby drinking water well and potentially provide enough effective <br /> remediation such that no additional active remediation in the hydrocarbon-impacted vadose zone <br /> . would be necessary <br /> Advanced GcoEn\ironmental, Inc <br />