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SEWERS AND UTILITY TUNNELS AS PREFERENTIAL PATHWAYS FOR VOLATILE ORGANIC COMPOUND MIGRATION INTO BUILDINGS: RISK FACTORS AND INVESTIGATION PROTOCOL
McHugh, T. and L. Beckley.
ESTCP Project ER-201505, 2018

The objectives of this demonstration project were to (1) develop and validate an effective protocol to determine the presence or absence of a sewer/utility tunnel preferential pathway during a vapor intrusion (VI) investigation (i.e., is a sewer/utility transporting VOCs from a subsurface source causing unacceptable buildings impacts?); (2) apply the validated protocol at VI sites to evaluate how often sewer/utility preferential pathways play a role in VOC transport into buildings; and (3) use the results to develop a detailed conceptual model for preferential pathways that identifies the types of sites at risk and the key mechanisms and processes involved in VOC transport through preferential pathways. The following reports have been completed: Final Report (790 pp); Executive Summary (26 pp); Conceptual Model (20 pp); and Investigation Protocol (27 pp). https://www.serdp-estcp.org/Program-Areas/Environmental-Restoration/Contaminated-Groundwater/Emerging-Issues/ER-201505



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