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DEVELOPMENT OF RECOMMENDATIONS AND METHODS TO SUPPORT ASSESSMENT OF SOIL VENTING PERFORMANCE AND CLOSURE: PUBLISHED REPORT
DIGIULIO, D. C. AND R. Varadhan. DEVELOPMENT OF RECOMMENDATIONS AND METHODS TO SUPPORT ASSESSMENT OF SOIL VENTING PERFORMANCE AND CLOSURE: PUBLISHED REPORT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-01/070, 2001.
The purpose of this document is to improve the current "state of the art" and "state of the science" of soil venting application. A strategy is proposed for venting closure. A vadose zone paradigm is developed to dynamically link the performance of ground-water remediation to vadose zone remediation. A detailed andcomprehensive literature review is provided to form the foundation of an innovative method of design based on attainment of a critical pore-gas velocity in contaminated media. Research conducted to improve the science of venting application is summarized in the following areas: (1) linearization of the gas flow equation, (2) one-dimensional steady-state gas flow with slippage, (3) two-dimensional steady-state gas flow and permeability estimation in a domain open to the atmosphere, (4) two-dimensional steady-state gas flow and permeability estimation in a semi-confined domain, (5) two-dimensional transient gas flow and permeability estimation, (6) radius of influence versus critical pore-gas velocity based venting design, (7) modification of a gas extraction well to minimize water-table upwelling, (8) rate-limited vapor transport with diffusion modeling, (9) respiration testing, and (10) one-dimensional, analytical, vadose zone transport modeling to assess mass flux to and from the capillary fringe.