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SUCCESSFUL CLOSURE OF A DNAPL SITE: LESSONS LEARNED
Cox, C.
Abstract Book: AEHS Foundation 34th Annual International Conference on Soils, Sediments, Water and Energy, 15-18 October 2018, Amherst, MA. p 171, 2018

A 500-gal release of TCE presented as a DNAPL beneath an industrial building and in perched water bodies within a glacial till setting in Ohio. Injected fluids can mobilize the source and provide a false indication of success, and in this case, pre- and post-injection membrane interface probe evaluations demonstrated that the TCE was forced into new areas ahead of the injectant. Following excavation and two phases of high-vacuum dual-phase extraction followed by potassium permanganate flooding, the site was closed under RCRA by 2007 and now has completed the post-closure care and monitoring period. Mass reduction was assessed using continuously monitored vapor stream concentrations, recovered fluid concentrations, and the results of phased 3D soil sampling efforts. Multiple lines-of-evidence estimates of mass removal ranged from 89% to 96%. See slides for additional information: https://www.epa.state.oh.us/portals/30/Brownfield_Conference/docs/Craig%20Cox2.pdf



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