ALTERNATIVE FORMULATIONS FOR OPTIMAL GROUNDWATER REMEDIATION DESIGN

This paper presents alternative formualtions of optimal pumping design for contaminated ground-water cleanup. Remediation-efficiency indicat ors are proposed for evaluating well performances in terms of contamin ant removal. For a selected remediation period, the alternative object ive functions are: (1) Total volume of the extracted and/or injected w ater; (2) total contaminant removal; (3) total residual contaminant; a nd (4) any weighted combination of the first and second or first and t hird items. With the introduction of a field variable, referred to as the temporal accumulative contaminant concentration, the contaminant r emoval by any remediation well is computed directly by solving a tempo ral-integrated contaminant transport equation. Ground-water-quality co nstraints can be placed on the residual average and/or maximum concent rations in selected aquifer zones and the concentrations at specified locations. The state sensitivities to the injection and extraction com ponents of the pumping rates are computed using formulations derived a nalytically from the state simulators.