1. Norwegian Geotechnical Institute (NGI), Department of Environmental Engineering,
P.O. Box 3930, Ullevål Stadion, NO-0806 Oslo, Norway
2. Department of Plant and Environmental
Sciences (IPM), Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway
3. Department of Applied Environmental
Sciences (ITM), Stockholm University, 10691
Sweden
4. U.S. Geological Survey, Denver, Colorado 80225, United States