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' 20 August 2003 <br /> AGE-NC Project No 95-0173 <br />' Page 3 of 8 <br /> • MTBE,tert-amyl methyl ether(TAME), tertiary butanol (TBA), di-isopropyl ether(DIPE), <br />' ethyl tert butyl ether(ETBE), 1,2-dichloroethane(1,2-DCA)and ethylene-dibromide(EDB) <br /> by EPA Method 5030/8260 <br /> 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE SYSTEM <br />' Between 17 December 2002 and 20 March 2003, SVE remediation was in continual operation at the <br /> site, utilizing a Solleco Ecat 250 catalytic converter vapor extraction system to apply an induced <br />' vacuum to wells VW-1 through VW-7, during SVE operation, IAS remediation was selectively <br /> continued with air sparging through wells AW-1 through AW-7 <br />' During the SVE monthly monitoring event on 20 March 2003, AGE discovered that the SVE unit <br /> had automatically shut-down on or around 17 March 2003 due to a malfunction in the electric control <br />' panel (i e faulty electric contactor), the SVE unit was non-operational for repairs and maintenance <br /> until 01 April 2003 <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 /> I3 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 />' 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 /> Thermo Environmental 580A 10 0 eV calibrated to isobutvlene) 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 quarter and are summarized in Table 6, SVE performance at the site is summarized <br /> in Table 7 <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />