PLUMLEE, Geoffrey S., U.S. Geological Survey, MS 964 Denver Federal Center, Denver, CO 80225, MEEKER, Gregory P., U. S. Geological Survey, MS 973, Denver Federal Center, Denver, CO 80225, VAN GOSEN, Bradley S., United States Geological Survey, MS 973 Denver Federal Center, Denver, CO 80225, SAN JUAN, Carma A., U.S. Geological Survey, Central Mineral and Environmental Resources Science Center, P.O. Box 25046, MS 973, Denver, CO 80225, BLITZ, Thomas, U.S. Geological Survey, P.O. Box 25046, MS 964, Denver, CO 80225, ELLEFSEN, Karl J., U.S. Geological Survey, Box 25046, Mail Stop 964, Denver Federal Center, Denver, CO 80225, MORMAN, Suzette A., USGS, MS 964 Denver Federal Center, Denver, CO 80225, BUCK, Brenda J., Geoscience, Univ of Nevada, Las Vegas, Box 4010 Lilly Fong Hall, 4505 Maryland Parkway, Las Vegas, NV 89154, MERKLER, Doug, USDA, NRCS, Las Vegas, 89120 and MILLER, Aubrey, National Institute of Environmental Health Sciences, National Institutes of Health, Bethesda, MD 27709, gplumlee@usgs.gov, gplumlee@usgs.gov