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I - 29 December 2004 AGE-NC Project No 95-0130 ' Page 5 of 10 ' 3 1 REMEDIATION SYSTEM PROCEDURES The SVE system utilized a manifold network of two-inch diameter, Schedule 40 PVC piping ' installed underground from SVE wells VW-1 through VW-3 to the inlet of the SVE remediation system The SVE remediation system consists of a Solleco Ecat 250 catalytic oxidizer vapor recovery system ' In order to monitor efficiency of the SVE system, 1) a Magnehelic vacuum gauge (Dwyer DS-200 flow sensor) was installed prior to the inlet of the SVE unit so that air flow is monitored, the flow ' rate was determined from the measured differential pressure and the piping diameter using a nomograph (Appendix B), 2) SVE air flow of the influent and effluent streams were monitored routinely for the presence of organic vapor using an organic vapor analyzer(OVA) equipped with ' a photo-ionization detector(PID Thermo Environmental 580B, 10 0 eV,calibrated to isobutylene), and 3) influent and effluent air flow vapor stream samples were collected from sampling ports installed upstream(influent)of the vacuum blower and downstream(effluent)ofthe carbon camsters ' and submitted for laboratory analysis Field measurements were recorded at regular intervals and are summarized in Table 6 ' Between 31 August and 01 October 2004, an induced vacuum was selectively applied to SVE wells (VW-1 through VW-3)to extract hydrocarbon vapor from the subsurface Following the first week of operation(start-up), SVE wells VW-2B and VW-3B were each closed at the well-head due to the ' intense petroleum hydrocarbon vapor encountered when extracting from all three wells (Table 6), therefore, SVE well VW-1AB was the sole SVE well utilized between 08 September and 01 ' October 2004 ' 32 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES A total of three sets of extracted air flow vapor samples were collected on 31 August,22 September ' and 01 October 2004 from the influent and effluent of the catalytic oxidizer vapor recovery system to measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags utilizing an electric air-vacuum pump ' Following sample collection,the samples were properly labeled, placed in a covered container and transported under chain of custody to CTEL, a DHS-certified laboratory in California Each sample ' was analyzed within 72 hours of collection for TPH-g, BTEX and MTBE in accordance with EPA Methods 8015M and 8021 ' Advanced CcoEnvironmental,Inc