1. Graduate Program in Toxicology, University of Saskatchewan, Saskatoon, SK, Canada, Laboratory of Microbial Ecology and Technology, University of Ghent, Belgium, Department of Geological Sciences and Geological Engineering & School of Environmental Studies, Queen's University, Kingston, ON, Canada, Natural Resources Canada, Geological Survey of Canada (Atlantic), Dartmouth, NS, Canada, and Toxicology Group, Department of Soil Science, University of Saskatchewan, Saskatoon, SK, Canada