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J Contam Hydrol

Title:		Using vapor phase tomography to measure the spatial distribution of vapor concentrations and flux for vadose-zone VOC sources
Author(s):		Mainhagu J; Morrison C; Brusseau ML;
Address:		"Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, Tucson, AZ 85721, United States. Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, Tucson, AZ 85721, United States; Hydrology and Water Resources Department, School of Earth and Environmental Sciences, University of Arizona, Tucson, AZ 85721, United States. Electronic address: Brusseau@email.arizona.edu"
Journal Title:		J Contam Hydrol
Year:		2015
Volume:		20150318
Issue:
Page Number:		54 - 63
DOI:		10.1016/j.jconhyd.2015.03.002
ISSN/ISBN:		1873-6009 (Electronic) 0169-7722 (Print) 0169-7722 (Linking)
Abstract:		"A test was conducted at a chlorinated-solvent contaminated site in Tucson, AZ, to evaluate the effectiveness of vapor-phase tomography (VPT) for characterizing the distribution of volatile organic contaminants (VOC) in the vadose zone. A soil vapor extraction (SVE) system has been in operation at the site since 2007. Vapor concentration and vacuum pressure were measured at four different depths in each of the four monitoring wells surrounding the extraction well. The test provided a 3D characterization of local vapor concentrations under induced-gradient conditions. Permeability data obtained from analysis of borehole logs were used along with pressure and the vapor-concentration data to determine VOC mass flux within the test domain. A region of higher mass flux was identified in the deepest interval of the S-SW section of the domain, indicating the possible location of a zone with greater contaminant mass. These results are consistent with the TCE-concentration distribution obtained from sediment coring conducted at the site. In contrast, the results of a standard soil gas survey did not indicate the presence of a zone with greater contaminant mass. These results indicate that the VPT test provided a robust characterization of VOC concentration and flux distribution at the site"
Keywords:		"Arizona Gases Groundwater Permeability Solvents/analysis/chemistry Tomography/*methods Volatile Organic Compounds/*analysis/chemistry Water Pollutants, Chemical/analysis/chemistry Water Wells Dnapl Remediation Sve Tomography Voc;"
Notes:		"MedlineMainhagu, J Morrison, C Brusseau, M L eng P42 ES004940/ES/NIEHS NIH HHS/ ES04940/ES/NIEHS NIH HHS/ Research Support, N.I.H., Extramural Research Support, U.S. Gov't, Non-P.H.S. Netherlands 2015/04/04 J Contam Hydrol. 2015 Jun-Jul; 177-178:54-63. doi: 10.1016/j.jconhyd.2015.03.002. Epub 2015 Mar 18"