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r - � zV u 9^ -F 1 �sY S. - w v < 1 es ,.. .. ♦ _ � J.-_ - "- � I a � .% <br /> w 1 t F <br /> I <br /> 15 December 2003 ti , <br /> AGE-NC Project No 98-0448 <br />' Page 3 of 9 <br />' 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 /> methyl tertiary-butyl ether(MTBE) by EPA Method 8260B <br /> SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PROCEDURES <br /> Between 23 June 2003 and 09 October 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, 1AS 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 mject air beneath r <br /> the water table Operation and design of the SVE and 1AS systems for the site were described in <br /> Remedial 14ction 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 /> 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 /> 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 a vapor moisture knockout drum and then into two sequential 100-gallon carbon canisters <br /> A Magnehelic vacuum gauge was attached to the inlet of the blower, air flow was monitored at the <br /> inlet using a Dwyer DS-200 flow sensor A flow rate was determined from the measured differential <br />' pressure and the piping diameter using a nomograph (Appendix B) <br /> In order to monitor the efficiency ofhydrocarbon 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 /> l 10 0 eV,calibrated to isobuty16fie)afid 2) influent aril effluent ail fl6w vapor stream samples were - W <br /> E <br />' collected from samplingports installed upstream(influent)and downstream(effluent)of the vacuum <br /> blower and analyzed Field measurements were recorded at regular intervals and are summarized in <br /> Table 6 <br /> E I <br /> 1 y ly <br />' Advanced GeoEnvironmentai,Inc <br /> I , <br /> 1 1 1 <br />