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Physical, chemical, and biological data associated with irrigation drainage were collected between September 1987 and December 1989 at several sites in and near Stillwater, Fernley, and Humboldt Wildlife Management Areas, and Carson Lake, Nevada. The data were collected in support of the U.S. Department of the Interior program of detailed studies of irrigation-drainage projects in the western United States. This report contains data on trace-element concentrations in samples of surface water, ground water, drift and detritus, bottom sediment, pore water, and biota (plants, invertebrates, fish, and waterfowl). Other data presented in the report include surface-water discharge; ground-water levels; lithology of wells; mineralogy of cores and bottom sediment; concentrations of major dissolved constituents, nitrogen, phosphorus, organic carbon, and radiochemical constituents in water; and particle-size determinations and concentrations of organochlorine pesticides and organic carbon in bottom sediment. INTRODUCTION Background A reconnaissance investigation by the U.S. Department of the Interior (DOI) in 1986-87 (Hoffman and others, 1990) indicated that potentially toxic contaminants in irrigation drain water could pose a threat to human health, fish, and wildlife in and near Stillwater Wildlife Management Area (WMA), Nevada. The study results indicated that samples of water, bottom sediment, and biota in areas affected by irrigation drainage contained concentrations of arsenic, boron, mercury, and selenium that exceeded either background levels or Federal and State criteria for the protection of human health, fish, and wildlife. Furthermore, the authors indicated (p. 75) that other contaminants in the study area were of environmental concern namely, chromium, copper, zinc, un-ionized ammonia, sodium, and salinity. 1 U.S. Geological Survey. 2 U.S. Fish and Wildlife Service.

u.s. geological survey open file report/open-file report

Physical, chemical, and biological data for detailed study of irrigation drainage in and near Stillwater, Fernley, and Humboldt Wildlife Management Areas, and Carson Lake, west-central Nevada, 1987-89