1. Centre for Hydrogeology, University of Neuchâtel, Rue Emile Argand 11, CH-2009 Neuchâtel, Switzerland, Laboratory for Microbiology, University of Neuchâtel, Rue Emile Argand 11, CH-2009 Neuchâtel, Switzerland, Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo ON N2L 3G1, Canada, and Geosyntec Consultants, 130 Research Lane, Guelph ON N1G 5G3, Canada