Abstract
As part of a hazardous waste negotiation settlement process, groundwater flow and transport models were developed for the Chem-Dyne site in Hamilton, Ohio. These models were subsequently used for a preliminary evaluation of a proposed remedial action using extraction/injection wells. As a result of this modelling evaluation, a large portion of the settlement concerned performance measures, monitoring, and contingencies. This ultimately led to a remediation that is goal-oriented rather than duration-oriented. This represented the first settlement of a major groundwater clean-up under the Superfund law. In addition to the use of models in the settlement process, the consent decree includes the use of models throughout the clean-up process and evaluation of the response of the groundwater flow system to the remedial action. The consent decree also requires the use of modelling prior to termination of the extraction/injection wells.
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