Affiliation: | U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Subsurface Protection and Remediation Division, 919 Kerr Research Dr., P.O. Box 1198, Ada, OK 74820;;Conor Pacific Environmental Technologies Inc., 300–1727 West Broadway, Vancouver, British Columbia, Canada V6J 4W6;;Department of Earth Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1; |