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, IL, USA