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Ground Water Monit Remediat

Title:		Field Study of Soil Vapor Extraction for Reducing Off-Site Vapor Intrusion
Author(s):		Stewart L; Lutes C; Truesdale R; Schumacher B; Zimmerman JH; Connell R;
Address:		Praxis Environmental Technologies. Jacobs Engineering. RTI International. U.S. EPA Office of Research and Development (ORD). U.S. EPA National Enforcement Investigations Center
Journal Title:		Ground Water Monit Remediat
Year:		2020
Volume:		40
Issue:		1
Page Number:		74 - 85
DOI:		10.1111/gwmr.12359
ISSN/ISBN:		1069-3629 (Print) 1745-6592 (Electronic) 1069-3629 (Linking)
Abstract:		"Soil vapor extraction (SVE) is effective for removing volatile organic compound (VOC) mass from the vadose zone and reducing the potential for vapor intrusion (VI) into overlying and surrounding buildings. However, the relationship between residual mass in the subsurface and VI is complex. Through a series of alternating extraction (SVE on) and rebound (SVE off) periods, this field study explored the relationship and aspects of SVE applicable to VI mitigation in a commercial/light-industrial setting. The primary objective was 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 subslab depressurization systems. We determined that SVE effectively mitigates offsite VI by intercepting or diluting contaminant vapors that would otherwise enter buildings through foundation slabs. Data indicate a measurable (5 Pa) influence of SVE on subslab/indoor pressure differential may occur but is not essential for effective VI mitigation. Indoor air quality improvements were evident in buildings 100 to 200 feet away from SVE including those without a measurable reversal of differential pressure across the slab or substantial reductions in subslab 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 subslab VOC concentration reductions"
Keywords:
Notes:		"PubMed-not-MEDLINEStewart, Lloyd Lutes, Chris Truesdale, Robert Schumacher, Brian Zimmerman, John H Connell, Rebecca eng EPA999999/ImEPA/Intramural EPA/ 2021/01/09 Ground Water Monit Remediat. 2020 Feb 11; 40(1):74-85. doi: 10.1111/gwmr.12359"