1. Contaminant Hydrogeologist, Golder Associates Ltd., 2390 Argentia Rd., Mississauga, Ontario, Canada L5N 5Z7 (corresponding author).
2. Professor and Chair, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
3. Professor, Dept. of Earth and Environmental Sciences, Univ. of Waterloo, Waterloo, Ontario, Canada N2L 3G1.