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that biological processes in the unsaturated zone consume much of the contaminant vapor <br /> f) Has pulsing of the system been considered9 Pulsing is an approach that may be applicable to sites with diffusion <br /> limited mass transfer (Note that pulsing may increase silting of the wells) <br /> g) In some cases, other technologies may be able to accomplish the same objectives and/or speed clean up The <br /> application of these alternative technologies should be economically justtfied based on present worth analysis <br /> compared to the cost of the current system <br /> • In-situ Bioremediation (e g ,co-metabolic degradation of chlorinated VOCs) <br /> • Permeable Reaction Walls (e g, for chlorinated organics using zero-valent iron) <br /> • In-Situ Chemical Oxidation (e g ,ozone,hydrogen peroxide) <br /> • Natural Attenuation <br /> • Ground Water Extraction (may be needed to control plume) <br /> • Ground Water Recirculation Wells(may be useful where stratigraphy may limit air sparguig) <br /> 9) Supplemental Notes 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/medusace-docs/ <br /> 2 Air Force Center for Environmental Excelience(AFCEE)Protocol,available at <br /> www afcee brooks of mil/ER/toolbox htm <br /> 06/07/99 <br /> Page 6 of 6 <br />