Abstract
A two-well injection-withdrawal experiment was conducted at a hazardous waste disposal site near Ottawa, Canada to assess the feasibility of aquifer restoration by means of a purge well network. The six-day test involved injecting tracer-labeled clean water into one well while withdrawing contaminated water from a well located 5m away. Samples taken from multilevel sampling points located along flow lines between the two wells were analyzed to determine the concentrations of tracers and volatile organic contaminants. Tracer breakthrough data were fitted to an approximate analytic solution to determine average linear velocities and dispersivites. The concentration histories obtained for three volatile organic contaminants deviate significantly from that predicted using local equilibrium-based transport models. Comparison with results of a one-dimensional, kinetics-based transport model indicates qualitative agreement between observed transport behavior and that expected for solutes affected by a first-order reversible sorption process for which the rate constants are small relative to the groundwater velocity in the induced flow field.
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