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I <br />' 07 February 2000 <br /> AGE-NC Project No 95-0143 <br />' Page 2 of 5 <br />' DOT-approved drums on-site Field data and field logs are included in Appendix A <br />' 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new, disposable bailers and, upon <br />' retrieval,were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric <br /> acid as a sample preservative The samples were labeled and transported under chain-of-custody, in <br /> a chilled container, to McCampbell Analytical, Inc (MAI), a State of California Department of <br />' Health Services (DHS)-certified laboratory, and were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015m, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br />' with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020/602, and <br /> • Fuel oxygenates di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br />�. tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260 <br /> 23 OPERATION OF SVE/IAS UNITS <br /> IOperation of the SVE and IAS units was initiated on 03 November 1999 The sparging system <br /> operates on a one hour on/one hour off cycle The air flow rate to each sparging well was maintained <br /> at approximately 20 cubic feet per hour (cfh) during operation The extraction system operates <br />' continually The flow rate, burner temperature, exhaust temperature and LEL were continually <br /> recorded on a chart recorder Field measurement of flow, vacuum and organic vapor concentration <br />' in the air stream from each extraction well were measured on a periodic basis <br />' 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> Isoil and ground water was inferred from laboratory analysis and field observations <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to water from the <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />