A three-dimensional numerical groundwater flow and solute transport model was developed by EHS Support to aid in the investigation of a 1,4-dioxane and chlorinated volatile organic compound (CVOC) plume associated with a special chemical manufacturing facility. The groundwater model was developed to support advancement of the conceptual site model in a complex hydrogeologic setting (i.e., prolific sand and gravel aquifer) located near the Tennessee River. The model was used to support the following project objectives:
- Evaluate the influence of historical pumping from multiple industrial production wells on solute distribution and plume geometry.
- Support and streamline investigation activities by estimating the vertical and lateral solute distribution in groundwater to support the definition of the nature and extent of 1,4-dioxane and CVOCs.
- Evaluate the efficacy of repurposing historical production wells as remediation wells.
Summary of Results
The numerical model provided a valuable tool to use for investigation and remediation design purposes. Model predictions about the likely distribution of 1,4-dioxane and CVOCs reduced the time and cost necessary to advance investigation activities and limited the need for intrusive activities on downgradient properties owned by others.
The project is entering the final phases of investigation activities and will be transitioning into the remedial selection and design phases. The numerical model will continue to be leveraged as the investigation is completed and the remedy evaluation, selection, and design are advanced.