Laserfiche WebLink
' 20 March 2006 <br /> AGE-NC Project No 95-0130 <br />' Page 6 of 13 <br /> 3.0. INTERIM SOIL VAPOR EXTRACTION REMEDIATION <br />' Between 07 September and 07 December 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-213 and VW-313 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 /> i <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 D),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 /> 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 07 September 2005 and 07 December 2005, an induced vacuum was selectively applied <br /> to SVE wells VW-1 (A and B), VW-2A and VW-3A to extract hydrocarbon vapor from the <br /> subsurface (Table 6) <br />' 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of three sets of extracted air flow vapor samples were collected on 10 October,07 November <br /> and 07 December 2005 from the influent and effluent of the catalytic oxidizer vapor recovery system <br /> to measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags utilizing <br />' Advanced GeoEnvironmental,Inc <br />