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Simplified Approach for Calculating Building‐Specific Attenuation Factors and Vapor Intrusion Mitigation System Flux‐Based Radius of Influence
Author(s) -
Nicholson B.A.Sc. Paul,
Mali B.A.Sc Darius,
McAlary Ph.D. Todd A.
Publication year - 2021
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/gwmr.12456
Subject(s) - radius , attenuation , slab , flux (metallurgy) , suction , environmental science , mechanics , computer science , engineering , structural engineering , physics , mechanical engineering , materials science , optics , computer security , metallurgy
This article describes a simplified method to calculate a building‐specific subslab to indoor air attenuation factor using data collected during pressure‐field extension testing similar to industry standards for radon mitigation. It also describes a simplified method to calculate the radius of influence for a conventional suction point using a mass flux‐balance model. The analysis is based on three simple measurements: (1) the extraction flow rate, (2) cross‐slab applied vacuum at a radial distance of 3 feet, and (3) cross‐slab applied vacuum at a radial distance of 10 feet. The intent is to provide a practitioner with a rapid and useful screening‐level assessment of whether the benefits of reduced mitigation system costs warrant an investment in a more detailed mathematical analysis of the flow and vacuum data. In addition, this may also help a practitioner to make real‐time decisions regarding placement of communication test points during pressure‐field extension testing.

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