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Stewart, L., C. Lutes, R. Truesdale, B. Schumacher, J.H. Zimmerman, and R. Connell.
Groundwater Monitoring & Remediation [Published online 14 January 2020 prior to print]

A series of alternating extraction (soil vapor extraction [SVE] on) and rebound (SVE off) periods were run to determine if SVE could provide VI mitigation over a wide area encompassing multiple buildings, city streets, and subsurface utilities and eliminate the need for individual sub-slab depressurization systems in a commercial/light-industrial setting. SVE effectively mitigated offsite VI by intercepting or diluting contaminant vapors that would otherwise enter buildings through foundation slabs. Data indicated a measurable (5 Pa) influence of SVE on sub-slab/indoor pressure differential may occur but is not essential for effective VI mitigation. Indoor air quality improvements were evident in buildings 100-200 ft from SVE including those without a measurable reversal of differential pressure across the slab or substantial reductions in sub-slab VOC concentration. These cases also demonstrated mitigation effects across a four-lane avenue with subsurface utilities. These findings suggest that SVE affects distant VI entry points with little observable impact on differential pressures and without relying on sub-slab VOC concentration reductions.

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