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THE EVOLUTION OF REMEDIATION IN DNAPL IMPACTED LOW PERMEABILITY SOILS FROM PRE-RCRA TO 2018: A SITE HISTORY
Stiffler, E. and M. Allendorf.
AEG News 61(4):200(2018) [AEG 61st Annual Meeting, Program with Abstracts, Poster]

Since 1985, an unlined pre-RCRA solid waste management unit storage pit has undergone a series of treatments to restore the site groundwater to acceptable drinking water standards. Operated from about 1978 to 1980, the pit previously contained waste contaminated with chlorinated solvents. The first remedial solution utilized was excavation of the pit and associated contaminated soils. Because the excavation was limited to 25 ft bgs by the water table, the area below that remained as a secondary source zone. In the late 1990s, in situ chemical oxidation (ISCO) injections were conducted unsuccessfully due to the low permeability of the formation. The third remedial technology, groundwater pump and treat, was operated from May 2001 to December 2009, but following cessation of groundwater extraction, rebounding contaminant concentrations in extraction wells previously clean prior to the ISCO injections indicated that back diffusion was occurring from source material that remained sorbed to the soil matrix. The fourth remedial technology implemented, enhanced in situ bioremediation (EISB), succeeded in reducing parent constituents (PCE, TCE, etc.) to daughter products (1,2-DCE and VC). The fifth method planned for remediation is direct-push jet injection of zero-valent iron and EISB solution, which will place remedial material in direct contact with residually impacted low-permeability soils.



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