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1 li <br /> 17 September 2003 <br /> AGE-NC Project No 98-0448 <br />' Page 3 of 9 <br /> i <br /> + 1 <br /> 1 <br /> 1 <br /> 6 � 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EDB), tertiary butanol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and <br /> 1 <br /> MTBE by EPA Method 8260 <br /> 3.0. SOIL VAPOR EXTRACTIONIIN-SITU AIR SPARGE PROCEDURES <br /> 1 , <br /> Between 20 March 2003 and 23 June 2003,an SVE remediation system was continuously operated <br />' at the site, utilizing a regenerative vacuum blower to apply an induced vacuum to wells VW-1 <br /> through VW-5 During this time, TAS remediation was continually operated at the site on wells <br /> AW-1 through AW-4 (screened 25 to 30 feet bsg)utilizing an air compressor to infect air beneath rs <br />' the water table Operation and design of the SVE and IAS systems for the site were described in <br /> Remedial Action Work Plan dated 07 July 2000, prepared by AGE, and approved by the EHD by <br /> letter dated 14 July 2000 <br /> 3 1 SOIL VAPOR EXTRACTION SYSTEM PROCEDURES <br />�• <br /> The SVE system utilizes a Fuji, 3-horsepower regenerative vacuum blower and two 100-gallon <br /> carbon canisters to extract and adsorb hydrocarbon vapor from the subsurface A manifold network <br />' i of two-inch diameter,schedule 80 PVC piping was installed underground from wells VW-1 through <br /> VW-5 to the inlet of the regenerative vacuum blower,the outlet from the vacuum blower was routed <br /> through two sequential 100-gallon carbon canisters A Magnehelic vacuum gauge was attached to <br />' the inlet of the blower, air flow was monitored at the inlet using a Dwyer DS-200 flow sensor A <br /> flow rate was determined from the measured differential pressure and the piping diameter using a <br /> nomograph (Appendix B) <br /> 1 <br /> In order to monitor the efficiency of hydrocarbon destruction, 1)the SVE air flow of the influent and <br /> effluent streams was monitored routinely for the presence of organic vapor using an organic vapor <br /> analyzer (OVA) equipped with a photo-ionization detector (PID Thermo Environmental 580B, <br /> 10 0 eV, calibrated to isobutylene) and 2) influent and effluent air flow vapor stream samples were <br /> collected from samplmgports installed upstream(influent)and downstream(effluent)ofthe vacuum <br /> blower and analyzed Field measurements were recorded at regular intervals and are summarized in <br /> Table 6 <br /> ' 4 <br /> 1 <br /> Advanced GeoEnv>ronmental,Inc <br />