Comparing Vapor Intrusion Mitigation System Performance for VOCs and Radon |
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| Authors: | Christopher C Lutes Robert S Truesdale Brian W Cosky John H Zimmerman Brian A Schumacher |
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| Affiliation: | 1. CH2MHILL, 3120 Highwoods Blvd., Suite 214, Raleigh, NC27604;2. RTI International, 3040 Cornwallis Road, Research Triangle Park, NC27709;3. ARCADIS U.S., Inc., 132 East Washington Street, Suite 600, Indianapolis, IN46204;4. U.S. EPA/Office of Research and Development/National Exposure Research Laboratory, 944 East Harmon Avenue, Las Vegas, NV89119 |
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| Abstract: | This article summarizes a long‐term study of vapor intrusion mitigation system performance in a historic, unoccupied residential duplex with an extensive set of temporal variability observations. The experimental design included multiple cycles of subslab depressurization (SSD) system operation and shut‐off during a seven‐month period, followed by a year‐long period of continuous operation. Results showed that the system provided rapid pressure field extension and radon control as much as 100 days of operation before optimum volatile organic compound (VOC) mitigation was achieved. Greater variability in VOC concentrations than in radon concentrations was observed during the initial mitigation system cycling. Subslab VOC concentrations at numerous locations increased during this initial period of SSD operation, and indoor air VOC concentrations were more variable than radon. However, indoor air concentrations were considerably less variable (and lower) during the first year of continuous mitigation system operation. ©2015 Wiley Periodicals, Inc. |
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