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THE IMPACT OF SOIL VAPOR EXTRACTION AT MATERIAL DISPOSAL AREA L, LOS ALAMOS NATIONAL LABORATORY
Snyder, E.E., S. Marczak, L. Salazar, G. Fordham, S. Chu, D. Strobridge, K. Birdsell, et al.
WM2017: Waste Management Conference, March 5-9, 2017, Phoenix, Arizona. Paper 17155, 2017

Material Disposal Area L (MDA L) is an inactive liquid-waste disposal site located within the Los Alamos National Laboratory property. A subsurface vapor plume of VOCs is present in the unsaturated zone, and site remediation is recommended so that the plume will not affect groundwater in the future. Soil vapor extraction (SVE) using two extraction wells was conducted at the site for 10 months as an interim remediation measure. Plume size, concentrations vs. time and depth in monitoring wells, predicted vs. measured extraction concentrations, and plume rebound were measured to understand the impact of the interim measure and gather feedback on how to continue remediation. An existing model was recalibrated and used to predict plume behavior with field data collected during extraction. The SVE effort decreased vapor plume size by 60%. This paper presents results for the removal of VOCs from the subsurface and the spatially dependent reduction of VOC concentrations in the plume. http://www.wmsym.org/archives/2017/pdfs/FinalPaper_17155_0511115524.pdf



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