1. Environmental Sciences Laboratory, Navarro Research and EngineeringGrand JunctionCO81503
2. School of Engineering and Applied Science, Univ. of VirginiaCharlottesvilleVA22904‐4246
3. Emeritus, Division of Hydrological SciencesDesert Research InstituteRenoNV89512
4. Geo‐Smith EngineeringGrand JunctionCO81503
5. US Department of EnergyGrand JunctionCO81503