Technical Integrity / Collaboration / Exceptional Results

Feasibility Study at a Former Rayon Manufacturing Facility

Integral scientists and engineers managed a CERCLA feasibility study of remedial alternatives for waste disposal basins and related groundwater impacts at a former rayon manufacturing facility in Virginia. The basins hold 375,000 cubic yards of gelatinous viscose material containing high-pH leachate contaminated with carbon disulfide, metals, and other contaminants. The properties of the waste materials are not compatible with conventional remediation methods and thus require innovative approaches. Leachate released from the basins behaved as a dense aqueous phase liquid (DAPL)—forming a groundwater plume nearly a mile long and extending 400 feet deep in a fractured shale bedrock aquifer. The plume has migrated beyond the groundwater divide of the nearby Shenandoah River and affected wells on the opposite side of the river.

Integral staff developed and directed field sampling and laboratory treatability testing to characterize the nature and extent of contamination, assess chemical fate and transport in groundwater, and evaluate potential remedial technologies for the basin wastes and groundwater. Integral staff also led the preparation of a feasibility study report in which potentially viable remedial alternatives for the basins and groundwater were identified and evaluated, and a preferred remedy was proposed.

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