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J Contam Hydrol

Title:		Simulating an exclusion zone for vapour intrusion of TCE from groundwater into indoor air
Author(s):		Wang X; Unger AJ; Parker BL;
Address:		"Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave. W., Waterloo, Ontario, Canada N2L 3G1"
Journal Title:		J Contam Hydrol
Year:		2012
Volume:		20120813
Issue:
Page Number:		124 - 138
DOI:		10.1016/j.jconhyd.2012.07.004
ISSN/ISBN:		1873-6009 (Electronic) 0169-7722 (Linking)
Abstract:		"This paper is an extension of the work by Yu et al. (2009) to examine exposure pathways of volatile organic compounds (VOCs) originating from a NAPL source zone located below the water table, and their potential impact on multiple residential dwellings down-gradient of the source zone. The three-dimensional problem geometry is based on the Rivett (1995) field experiment in the Borden aquifer, and contains houses located both above and adjacent to the groundwater plume in order to define an exclusion zone. Simulation results using the numerical model CompFlow Bio indicate that houses which are laterally offset from the groundwater plume are less affected by vapour intrusion than those located directly above the plume due to limited transverse horizontal flux of TCE within the groundwater plume, in agreement with the ASTM (2008) guidance. Uncertainty in the simulated indoor air concentration is sensitive to heterogeneity in the permeability structure of a stratigraphically continuous aquifer, with uncertainty defined as the probability of simulated indoor air concentrations exceeding the NYSDOH (2005) regulatory limit. Within this uncertainty framework, this work shows that the Johnson and Ettinger (1991), ASTM (2008) and CompFlow Bio models all delineate an identical exclusion zone at a 99.9% confidence interval of indoor air concentrations based on the probability of exceedence"
Keywords:		"Air/*analysis Air Pollution, Indoor/analysis Groundwater/*chemistry Models, Theoretical Trichloroethylene/*chemistry Volatile Organic Compounds/chemistry;"
Notes:		"MedlineWang, Xiaomin Unger, Andre J A Parker, Beth L eng Research Support, Non-U.S. Gov't Netherlands 2012/10/03 J Contam Hydrol. 2012 Oct; 140-141:124-38. doi: 10.1016/j.jconhyd.2012.07.004. Epub 2012 Aug 13"