A Remedial Investigation of an Organically Polluted Outwash Aquifer |
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| Authors: | Richard E. Jackson Ronald J. Patterson |
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| Affiliation: | Richard Jackson is chief of the Ground Water Contamination Project at the National Water Research Institute of Canada (CCIW, P.O. Box 5050, Burlington, Ontario, L7R 4A6, Canada). He was awarded a Ph.D. in contaminant hydrogeology by the University of Waterloo in 1979 and a B.S. in hydrology by the University of Arizona in 1969.;Ron Patterson was awarded a Ph.D. by Princeton University in 1972 and has more than 17years experience in contaminant hydrogeology, geochemistry, and waste site assessment and remediation. He is a senior program manager with Golder Associates Inc. (1809 N. Mill St, Ste. C, Naperville, IL 60540) and is involved in projects that include the design, installation, and sampling of monitoring well networks, ground water flow and transport modeling, selection and design of remedial alternatives and ground water supply. |
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| Abstract: | A glacial outwash aquifer underlying the Gloucester Landfill near Ottawa, Canada, has become polluted with various organic chemicals following the disposal of laboratory solvents in shallow trenches immediately above the aquifer. Several remedial alternatives have been considered by the government of Canada. Impermeable barrier walls were rejected as being unsuitable given the permeable nature of the underlying bedrock. It appears improbable that pools of liquid organic chemicals (DNAPLs) exist within the aquifer, although ganglia are likely present. Therefore, much of the contaminant plume can be removed hydraulically over a period of five years by the operation of four purge wells discharging to an on-site treatment plant from which the purified water is returned to the aquifer by recharge wells. The residual contamination is anticipated to be cleaned up by in situ biorestoration techniques currently under development. |
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