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. V. REMEDIATION SYSTEM DESIGN <br /> A combination of air sparging (AS) and soil vapor extraction (SVE) will be utilized to remediate <br /> dissolved-phase (groundwater) and sorbed-phase (soil)hydrocarbon concentrations Sufficient well <br /> spacing will be utilized for effective influence over the entire affected area at the site <br /> The AS operations will consist of the pressurized injection of air into the saturated (water-bearing <br /> portion of the subsurface) The injected air will assist in the volatilization and bioattenuation of <br /> dissolved-phase hydrocarbon concentrations <br /> As demonstrated by the results of the pilot testing, SVE will recover the dissolved-phase <br /> hydrocarbons volatilized by the action of the AS system and will be integral in removing sorbed- <br /> phase concentrations in the vadose zone which pose health or explosive hazards In addition, SVE <br /> will remove source area hydrocarbons that contribute to continued dissolved-phase concentrations <br /> A discussion of the design parameters, layout, equipment, and operation of the AS and SVE system <br /> follows <br /> . A. DESIGN PARAMETERS <br /> Based upon analysis of the pilot testing data, the design radial influences for AS and SVE were <br /> determmed to be approximately 10 feet and 20 feet, respectively A 15-foot AS well spacing and <br /> a 30-foot SVE well spacing were utilized for design purposes This will provide 50% overlap and <br /> expedite groundwater and soil remediation The operating parameters for the AS and SVE <br /> components are summarized in the following table <br /> Operating Well Pressure/ Compound Flow per Total <br /> Parameters: Vacuum Press/Vae Well Flow <br /> Well Type(#) (psighn,w.c.) (psighn.w.c.) (scfm) (scfm) <br /> Air Spargmg(13) 4 0 psig 70 30 21* <br /> Soil Vapor Extraction(5) 75 in w c 80 40 200 <br /> Special Note M Only half of the AS wells(7 wells maximum)will operate at any given time <br /> The proposed AS and SVE well locations, along with a graphical representation of the radial <br /> influences are presented on Figure 8 Details of the system design calculations are presented in <br /> Appendix H <br /> B. REMEDIATION SYSTEM DESIGN AND LAYOUT <br /> Remediation at the site will consist of operating a system which simultaneously employs air spargmg <br /> (AS) and soil vapor extraction(SVE) The system will include a network of 13 AS wells, designated <br /> V-1 <br />