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I <br />' 02 June 2005 <br /> . AGE-NC Project No 95-0130 <br />' Page 5 of 13 <br /> I3.0. INTERIM SOIL VAPOR EXTRACTION REMEDIATION <br /> Between 22 December 2004 and 08 March 2005, an SVE remediation system was continuously <br />' operated at the site, utilizing an electric catalytic oxidizer SVE system to selectively apply an <br /> induced vacuum to wells VW-1 (A and B),VW-2A and VW-3A SVE procedures for the site were <br /> described in the AGE-prepared Interim Remediation Work Plan, dated 21 May 2003,and approved <br />' by the SJCEHD by letter dated 10 June 2003 <br /> 3 1 REMEDIATION SYSTEM PROCEDURES <br /> The SVE system utilized a manifold network of two-Inch diameter, Schedule 40 PVC piping <br /> Installed underground from SVE wells VW-1 through VW-3 to the Inlet of the SVE remediation <br /> system The SVE remediation system consists of a Solleco Ecat 250 catalytic oxidizer vapor <br /> recovery system <br /> In order to monitor efficiency of the SVE system, 1)a Magnehelic vacuum gauge and Dwyer DS-200 <br />' differential pressure sensor was Installed prior to the Inlet of the SVE unit so that air flow rate is <br /> monitored, the flow rate was determined from the measured differential pressure and the piping <br /> diameter using a nomograph(Appendix F),2)SVE air flow of the influent and effluent streams were <br />' monitored routinely for the presence of organic vapor using an organic vapor analyzer (OVA) <br /> equipped with a photo-ionization detector(PID Thermo Environmental 580B, 10 0 eV, calibrated <br /> to isobutylene), and 3) Influent and effluent air flow vapor stream samples were collected from <br /> I sampling ports Installed upstream(Influent)of the vacuum blower and downstream(effluent)of the <br /> catalytic oxidizer and submitted for laboratory analysis Analytical results of SVE air flow samples <br /> are summarized in Table 5, field measurements were recorded at regular Intervals and are <br /> summarized in Table 6 <br /> Between 22 December 2004 and 08 March 2005,an induced vacuum was selectively appliedto SVE <br /> wells VW-1 (A and B), VW-2A and VW-3A to extract hydrocarbon vapor from the subsurface <br /> (Table 6) <br /> 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> IA total of three sets of extracted air flow vapor samples were collected on 20 January, 21 February <br /> and 08 March 2005 from the influent and effluent of the catalytic oxidizer vapor recovery system to <br /> I measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags utilizing <br /> an electric air-vacuum pump <br /> Advanced GeoEnvironmental,Inc <br />