ABSTRACT
Groundwater Circulation Wells (GCWs) are a promising technology for remediation of groundwater contaminated with dissolved hydrocarbons and chlorinated solvents. The GCW increased the dissolved oxygen concentration in the discharge water to between 7 and 8 mg/L and reduced contaminant concentrations to less than 20 µg/L total BTEX. Numerical simulations were conducted using the flow model MODFLOW and solute transport and biodegradation model RT3D to evaluate the performance of a single GCW and a row of GCWs. The single GCW effectively treats groundwater at depths less than 3.7 m grade but has little effect on BTEX concentrations this depth. A system of thirteen GCWs has been installed at the field site to treat an 18 m wide zone in the center of the BTEX plume. Monitoring results from the pilot and full scale system will be presented along with a discussion of construction, operation and maintenance issues and costs.
