1. Water Mission Area, Laboratory and Analytical Services Division; U.S. Geological Survey; 3215 Marine Street Ste. E-127 Boulder CO 80303 USA
2. Water Mission Area, Earth System Processes Division; U.S. Geological Survey; 3215 Marine Street Ste. E-127 Boulder CO 80303 USA
3. Department of Geology and Geological Engineering, Hydrologic Science and Engineering Program; Colorado School of Mines; 1500 Illinois Street Golden CO 80401 USA
4. Colorado Water Science Center; U.S. Geological Survey; MS 415 Denver CO 80225 USA