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i <br /> 19 July 2002 <br /> AGE-NC Project No 95-0173 <br /> IPage 3 of 8 <br /> I procedures for the site were described in the AGE-prepared Remedial Action Work Plan dated 30 <br /> December 1998, and approved by the EHD by letter dated 20 April 1999 <br /> 3 1 REMEDIATION SYSTEM PROCEDURES <br /> The SVE system utilized a Solleco Ecat 250 catalytic converter vapor extraction system The SVE <br /> system consisted of two-inch diameter, schedule 40 PVC piping installed underground from each <br /> well-head at wells VW-1 through VW-7 and connected to the inlet of the Solleco Ecat 250 vacuum <br /> blower, the outlet from the vacuum blower was routed through the catalytic converter Induced <br /> vacuum was measured utilizing a Magnehelic vacuum gauge attached to the inlet of the blower, SVE <br /> air flow was monitored using a Dwyer DS-200 flow sensor The flow rate was determined from the <br /> I measured differential pressure and the piping diameter using a nomograph (Appendix B) The SVE <br /> air flow along the influent and effluent-lines was monitored routinely for the presence of organic <br /> vapor using an organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID <br /> IThermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Sampling ports were installed <br /> upstream of the vacuum blower Inlet to recover SVE influent air flow vapor stream samples, and <br /> downstream of the catalytic converter to recover effluent SVE air flow samples to monitor the <br /> efficiency of hydrocarbon destruction Field measurements were recorded at regular intervals <br /> throughout the pilot test and are summarized in Table 6, SVE performance at the site is sununarized <br /> Iin Table 7 <br /> I3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of three pairs of extracted air flow vapor samples were collected from the influent and <br /> effluent of the SVE unit to measure concentrations of hydrocarbon vapor The samples were <br /> collected in Tedlar bags using a hand air-vacuum pump <br /> I Following sample collection, the samples were properly labeled, placed in a covered container and <br /> transported under chain-of-custody to McCampbell Analytical Laboratory (MAL) in Pacheco, <br /> California Each sample was analyzed within 72 hours of collection for TPH-g, BTEX and MTBE <br /> in accordance with EPA Methods 5030/8015 Modified and 8020 <br /> i <br /> Advanced GeoEnvironmental,Inc <br />