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' 15 September 1998 AGE-NC Project No. 95-0100 Page 2 of 5 ' District (APCD) and the PHS-EHD. Measurement of the SVE flow, vacuum (potential) and concentrations for the extracted soil-vapor and collection of a set of soil-vapor samples were observed by the APCD and PHS-EHD personnel. The samples were collected to establish a baseline of extracted hydrocarbon vapor concentrations in soil-vapor extracted by the SVE network and to determine the SVE hydrocarbon destruction percentage. 1 2.3. SOIL-VAPOR EXTRACTION ' The SVE system was monitored weekly for the first month of operation and bi-weekly thereafter. ' During each monitoring event, the flow rate of extracted soil-vapor was measured using a Dwyer pressure flow meter. Vacuum (potential) was measured at wells VW-1 and VW-2 using a magnehelic vacuum gauge. The organic-vapor concentration in the extracted soil-vapor stream was measured before entering the blower (influent stream) and after exiting the oven (effluent stream) using an organic vapor meter (OVM) equipped with a photo-ionization detector: PID (Thermo ' Environmental 580A, 10.OeV,calibrated to isobutylene 100 ppb). Four sets of soil-vapor samples were collected over the first five months of operation. Samples were ' collected on : 25 February,28 April, 04 June and 30 June in Tedlar vapor bags using a vacuum pump attached to the influent and effluent stream. The samples were labeled, placed in a pre-chilled cooler and transported under chain-of-custody to McCampbell Analytical, Inc. (MAI) in Pacheco. The ' samples were analyzed by: • EPA methods 5030/8015M for total petroleum hydrocarbons quantified as gasoline(TPH-g) and, • EPA method 8020 for volatile aromatics; benzene, toluene, ethylbenzene and total xylenes (BTEX). The samples collected on.25 February 1998 were also analyzed by: 1 - • EPA method 8260(m) for volatile.organic compounds and oxygenated fuel additives, di- isopropyl ether (DIPE), ethyl tertiary ,butyl ether (ETBE), methyl-tertiary butyl ether - - - (MTBE), tertiary butyl alcohol (TBA)`acidtertiary amyl methyl*ether (TAME). The results of the laboratory analysis are summarized in Table 1. 1 Advanced GeoEnvironmental,Inc.