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d) Can additional wells be placed in the plume or the extraction rates from existing wells be <br /> redistributed in a way that would economically speed remediation? (New wells may replace <br /> several existing wells and may achieve objectives at a lower total flow Detailed SVE modeling <br /> and extraction system optimization should be recommended as part of a separate study, if <br /> appropriate and justified by the potential costs savings) <br /> e) In some cases, other technologies may be able to accomplish the same objectives or speed <br /> clean up The application of these alternative technologies should be economically justified <br /> based on present worth analysis compared to the cost of the current system <br /> • Thermal Enhancement to SVE (See EPA 542/R-97/007) <br /> • Vacuum-Enhanced Pumping or Multiphase Extraction <br /> • Soil Excavation for source removal <br /> • Bioventing (Bioventing may eliminate the costs of treating off-gas, but may not adequately <br /> remediate heavy hydrocarbons) <br /> • Soil Fracturing (See EPA 542/R-97/007 Diffusion limitations may stall limit mass removal) <br /> 9) Supplemental Nates and Data <br /> There are pages of supplemental notes and data attached to this checklist <br /> EM USACE Engineering Manual,available at www usace army mil/met/usace-docs/ <br /> 06/07/99 <br /> Page 8 of 8 <br />