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07 February 2000 <br /> AGE-NC Project No. 95-0143 08 <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 /> 2.3. OPERATION OF SVE/IAS UNITS <br /> Operation 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 /> soil 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 /> Advanced GeoEnvironmental,Inc. <br />