1. School of Environmental Sciences, University of Guelph, Guelph, Canada;
2. G360 Institute for Groundwater Research, University of Guelph, Guelph, Canada;
3. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Canada;
4. EcoMetrix Inc, Mississauga, Canada;
5. BP Corporation North America Inc, Naperville, USA