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' • 11 March 2002 <br /> AGE-NC Project No. 95-0130 <br /> Page 13 of 13 <br /> ' 4.7. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGING PILOT TEST <br /> Following the IAS pilot test, an eight-hour SVEJAS pilot test will be performed at the site to <br /> ' determine effectiveness of SVE and IAS simultaneously.An internal combustion(IC)driven engine <br /> will be used to apply a vacuum on SVE well VW-4 while wells VW-1, VW-2, VW-3, EW-1 and <br /> MW-8 will be utilized as observation points.During the SVE pilot test,SVE operational parameters <br /> ' including soil-gas vapor concentrations,air flow and vacuum measurements will be monitored at%2- <br /> hour intervals utilizing Dwyer Magnehelic vacuum gauges and a photo-ionization detector (PID: <br /> Thermo Environmental 580A; 10.0 eV;calibrated to isobutylene).A compressor driven unit will be <br /> used to inject air into the subsurface via IAS well AW-1 while air sparging rate, vapor <br /> concentrations,ground water depths and dissolved oxygen will be measured at approximate%z-hour <br /> intervals from wells MW-1, MW-2, MW-3 and MW-4. <br /> ' Soil vapor samples will be collected from VW-4 at 2-hour intervals in Tedlar bags and analyzed for <br /> TPH-g, BTEX and MTBE from a DHS-certified laboratory. Soil vapor field parameters and <br /> analytical results will facilitate the design of an SVE system and will be used to determine a general <br /> radius of influence for spacing of SVE wells, selection of an appropriate SVE system and determine <br /> ' • feasibility of IAS as a remediation alternative. <br /> 1 <br /> Advanced GeoEnvironmental,Inc. <br />