Prepared in cooperation with the U.S. Bureau of Land Management Environmental Impact of the Contact and Sonoma Mercury Mines on Water, Sediment, and Biota in Anna Belcher and Little Sulphur Creek Watersheds, Sonoma County, California By James J. Rytuba, Roger L. Hothem, Jason T. May, Christopher S. Kim, David Lawler, and Daniel Goldstein Open-File Report 2008-1381 U.S. Department of the Interior U.S. Geological Survey