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15 December 2003 <br /> • AGE-NC Project No 95-0173 <br /> Page 3 of 9 <br /> • MTBE,tert-amyl methyl ether(TAME), tertiarybutanol (TBA), di-isopropyl ether(DiPE), <br /> ethyl tert butyl ether(ETBE), 1,2-dichloro ethane(1,2-DCA)and ethylene-dibromide(EDB) <br /> by EPA Method 5030/8260 <br /> 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM <br /> Between 23 June 2003 and 09 September 2003 SVE remediation was in operation at the site <br /> p � P <br /> utilizing a Solleco Ecat 250 catalytic converter vapor extraction system to apply an induced vacuum <br /> selectively to wells VW-1 through VW-7, during SVE operation, IAS remediation was selectively <br /> continued with air spargmg through wells AW-1 through AW-7 <br /> SVE and IAS procedures for the site were described in the AGE-prepared Remedial Action Work <br /> Plan dated 30 December 1998, and approved by the EHD by letter dated 20 April 1999 <br /> 3 1 REMEDIATION SYSTEM PROCEDURES <br /> 1 The SVE system utilizes a Solleco ECAT 250 catalytic oxidizer to extract and destruct hydrocarbon <br /> vapor from the subsurface A manifold network of two-inch diameter, schedule 80 PVC piping is <br />' installed underground from SVE wells VW-1 through VW-7 to the inlet of the Sollecto ECAT 250 <br /> catalytic oxidizer <br />' In order to monitor efficiency of the SVE system, 1) a Magnehelic vacuum gauge (Dwyer DS-200 <br /> flow sensor) was installed prior to the inlet of the SVE unit so that air flow is monitored, the flow <br /> rate was determined from the measured differential pressure and the piping diameter using a <br />' nomograph (Appendix B), 2) SVE air flow of the influent and effluent streams were monitored <br /> routinely for the presence of organic vapor using an organic vapor analyzer (OVA) equipped with <br /> a photo-ionization detector(PID Thermo Environmental 580B, 10 0 eV, calibrated to isobutylene), <br />' and 3) influent and effluent air flow vapor stream samples were collected from sampling ports <br /> installed upstream (influent) of the vacuum blower and downstream (effluent) of the catalytic <br /> oxidizer and submitted for laboratory analysis Field measurements were recorded at regular intervals <br /> and are S;iA ,r,aiized in T«i;le 6 <br /> Generally,an induced vacuum was applied to all seven SVE wells(VW-1 through VW-7)to extract <br /> and destruct hydrocarbon vapor from the subsurface, however, on 09 September 2003, the SVE <br /> network was reconfigured so that only VW-1 through VW-4 were utilized to extract hydrocarbon <br /> vapor Wells VW-5 through VW-7 were closed at the well-heads due to only trace levels of <br /> petroleum hydrocarbons observed from PID field measurements (Table 6) <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />