1. School of Environmental Sciences, Univ. of Guelph; Guelph ON N1G2W1 Canada
2. School of Environmental Sciences, Univ. of Guelph Ridgetown Campus; Ridgetown ON N0P2C0 Canada
3. Earth Resources and Geoscience Mapping Section, Ontario Geological Survey; Sudbury ON P3E6B5 Canada
4. Environmental Management Branch, Ontario Ministry of Agriculture, Food and Rural Affairs; Guelph ON N1G4Y2 Canada