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10 28 October 2005 <br /> AGE-NC Project No 95-0130 <br />' Page 5 of 13 <br />' results of ground water monitoring well samples are summarized an Tables 3 and 4 The laboratory <br /> reports (CTEL Laboratory I D 0506053) and chain of custody forms are presented in Appendix C, <br /> GeoTracker confirmation pages of the submitted laboratory electronic deliverable format(EDF)files <br />' and depth to water measurements are included in Appendix D <br />' 3.0. INTERIM SOIL VAPOR EXTRACTION REMEDIATION <br /> Between 08 March 2005 and 12 April 2005, an interim SVE remediation system was continuously <br />' operated at the site, utilizing an electric catalytic oxidizer SVE system to apply an induced vacuum <br /> to wells VW-1 (A and B),VW-2A and VW-3A,however,interim SVE operations were temporarily <br /> suspended at the site between 12 April and 22 June 2005 for repairs to the SVE heat exchanger SVE <br /> procedures for the site were described in the AGE-prepared Interim Remediation Work Plan, dated <br /> 21 May 2003, and approved by the SJCEHD by letter dated 10 June 2003 <br /> 3 1 REMEDIATION SYSTEM PROCEDURES <br /> 1 • 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 /> I 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 was <br /> continuously monitored, the flow rate was determined from the measured differential pressure and <br /> the piping diameter using a Dwyer Instruments nomograph (Appendix E), 2) SVE air flow of the <br /> influent and effluent streams were monitored routinely for the presence of organic vapor using an <br /> organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580B, 10 0 eV,calibrated to isobutylene),and 3)influent and effluent air flow vapor <br /> stream samples were collected from sampling ports installed upstream (influent) of the vacuum <br /> blower and downstream (effluent) of the catalytic oxidizer and submitted for laboratory analysis <br /> I Analytical results of SVE air flow samples are summarized in Table 5, field measurements were <br /> recorded at regular intervals and are summarized in Table 6 <br /> I Between 08 March 2005 and 12 April 2005, an induced vacuum was selectively applied to SVE <br /> wells VW-1 (A and B), VW-2B and VW-313 to extract hydrocarbon vapor from the subsurface <br /> (Table 6), due to a crack that developed in the heat exchanger, SVE operations were temporarily <br /> suspended between 12 April and 22 June 2005 so that the heat exchanger could be replaced by the <br /> manufacturer (Solleco) <br /> Advanced CcnEnviranmcntal,Inc <br /> f <br />