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I <br /> lie 28 May 2003 <br /> AGE-NC Project No 95-0173 <br /> Page 3 of 8 <br /> I MTBE, tert-amyl methyl ether(TAME), tertiary butanol(TBA), di-isopropyl ether(DIPE), <br /> ethyl tertbutyl ether(ETBE), 1,2-dichloroethane(1,2-DCA)and ethylene-dibromlde(EDB) <br /> by EPA Method 5030/8260 <br /> 3.0. SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE SYSTEM <br /> Between 26 September and 17 December 2002 SVE remediation was in continual operation at the <br /> p p <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 this time,IAS remediation was selectively continued <br /> with air sparging through wells AW-1 through AW-7 SVE and IAS procedures for the site were <br /> I described in the AGE-prepared Remedial Action Work Plan dated 30 December 1998, and approved <br /> by the EHD by letter dated 20 April 1999 <br /> I <br /> 3 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-I 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 detennined 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 isobutylene) 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 /> 32 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> Between 26 September and 17 December 2002, a total of four pairs of extracted air flow vapor <br /> samples were collected from the influent and effluent of the SVE unit to measure concentrations of <br /> hydrocarbon vapor The samples were collected In Tedlar bags using a hand air-vacuum pump <br /> IAdvanced GeoEnvironmental,Inc <br /> E <br />