GROUNDWATER REMEDIATION DESIGN USING A 3-DIMENSIONAL SIMULATION-MODELAND MIXED-INTEGER PROGRAMMING

A three-dimensional groundwater flow management model for making decis ions on the design of hydrodynamic control of a groundwater flow syste m using a combination of extraction and/or injection wells is develope d. The model takes into account constraints imposed on the system to s top the horizontal spread of contaminants and to ensure a net upward f low in areas where downward vertical gradients exist. The mathematical formulation of the groundwater remediation problem as a mixed-integer model and the strategy for solving the model are presented. Numerical results are presented for the Toms River Plant site, which is modeled as a five-layer aquifer system with interconnecting aquitards. A sens itivity analysis on the relative magnitude of the continuous operating costs and the fixed-charge costs is also presented.