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I ' 20 April 2000 • AGE-NC Project No 95-0143 ' J Page 2 of 6 ' 22 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new, disposable bailers and, upon retrieval, were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative The samples were labeled and transported under chain-of-custody, in a chilled container, to McCampbeil Analytical, Inc (MAI), a State of California Department of Health Services (DHS)-certified laboratory, and were analyzed for- - or• Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA Methods 5030/8015m, • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020/602, and • Fuel oxygenates dl-Isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) In accordance with EPA Method 8260 23 SVE/IAS UNITS OPERATION AND MONITORING ' Operation of the SVE and IAS units was Initiated on 03 November 1999 The sparging system operates on a one-hour on/one-hour off cycle The air flow rate to each sparging well was maintained ' at approximately 20 cubic feet per hour (cfh) during operation The extraction system operates continually The flow rate, burner temperature, exhaust temperature and LEL were continually recorded on a chart recorder The SVE system was operated as a thermal oxidation system from 03 November 1999 to 26 January 2000 with an operational temperature maintained above a minimum 1400°F Due to the low overall Ihydrocarbon concentrations in the extracted soil vapor, on 26 January, the SVE unit was switched to catalytic operation with the operational temperature maintained above 600°F Field measurement of flow,vacuum potential and organic vapor concentration In the air stream from each extraction well were measured on a periodic basis (Table 7) Soil vapor samples were collected from the input and the discharge of the SVE unit on 21 December 1999, I9 January 2000 and 08 March 2000 All samples were collected Into Tedlar bags and transported In a chilled container to DHS-certified laboratories The samples collected in December and January were transported to MAI, the sample collected In March 2000 was transported to Precision Enviro-Tech (PET) In • Stockton The samples were analyzed for TPH-g, BTEX and MTBE in accordance with EPA Methods 8015m/5030 and 8020/602 by MAI and In accordance with method TO-14 by PET Advanced GeoEn%sronmental,Inc 1,�