Passive Soil Vapor Extraction - GSI Environmental Inc.

SRNL-STI-2009-00571Rev. 1Table 5.1 provides examples of enhancement drivers that can and cannot be addressedby SVE. Typical site-specific parameters necessary to aid the decision process includeradial air permeability of the target zone, contaminant properties, depth to groundwaterand the depth and areal extent of the contamination. If the necessary informationregarding these parameters is not available or if the available information suggests thatthe site-specific conditions are not amenable to remediation by an soil vapor extraction,then the flow chart recommends evaluating technologies other than SVE. For sites withexisting ASVE operations, most of this information should already be available. Refer tosection 3.2 to determine whether site conditions that preclude selection of an SVEtechnology exist.Following this evaluation, a decision-maker might determine that SVE technologies canbe employed to eliminate all enhancement drivers at the site. If so, continuing the PSVEdecision process would allow for selection of appropriate SVE technologies that wouldmeet all MNA requirements. For sites where SVE is not sufficient to address all of theenhancement options, the flowchart directs the user towards other technologies that canbe used in combination with the selected SVE technology to achieve required goals.However, if it is determined that SVE cannot mitigate any of the current site conditionsthat preclude an MNA application, then the flowchart recommends that for sites withactive SVE operations, the site manager should immediately implement contingencyremedial actions until more appropriate technologies can be identified.38 Enhanced Attenuation TechnologiesPassive Soil Vapor Extraction