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Page 2789, results 69701 - 69725

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Reconnaissance of mercury in lakes, wetlands, and rivers in the Red River of the North Basin, North Dakota, March through August 2001
Steven K. Sando, G.J. Wiche, R.F. Lundgren, Bradley A. Sether
2003, Water-Resources Investigations Report 2003-4078
Devils Lake rose dramatically during the 1990's, causing extensive flood damages. Because of the potential for continued flooding, the U.S. Army Corps of Engineers has been conducting studies to evaluate the feasibility of constructing and operating an outlet from Devils Lake. The occurrence of mercury in lakes, wetlands, and rivers...
Hydrologic conditions and assessment of water resources in the Turkey Creek watershed, Jefferson County, Colorado, 1998-2001
Clifford R. Bossong, Jonathan S. Caine, David I. Stannard, Jennifer L. Flynn, Michael R. Stevens, Janet S. Heiny-Dash
2003, Water-Resources Investigations Report 2003-4034
The 47.2-square-mile Turkey Creek watershed, in Jefferson County southwest of Denver, Colorado, is relatively steep with about 4,000 feet of relief and is in an area of fractured crystalline rocks of Precambrian age. Water needs for about 4,900 households in the watershed are served by domestic wells and individual sewage-disposal...
Hydrogeology and Ground-Water Quality of Brunswick County, North Carolina
Stephen L. Harden, Jason M. Fine, Timothy B. Spruill
2003, Water-Resources Investigations Report 2003-4051
Brunswick County is the southernmost coastal county in North Carolina and lies in the southeastern part of the Coastal Plain physiographic province. In this report, geologic, hydrologic, and chemical data were used to investigate and delineate the hydrogeologic framework and ground-water quality of Brunswick County. The major aquifers and their...
Use of a probabilistic neural network to reduce costs of selecting construction rock
Donald A. Singer, James D. Bliss
2003, Natural Resources Research (12) 135-140
Rocks used as construction aggregate in temperate climates deteriorate to differing degrees because of repeated freezing and thawing. The magnitude of the deterioration depends on the rock's properties. Aggregate, including crushed carbonate rock, is required to have minimum geotechnical qualities before it can be used in asphalt and concrete. In...
Phosphorus in a ground-water contaminant plume discharging to Ashumet Pond, Cape Cod, Massachusetts, 1999
Timothy D. McCobb, Denis R. LeBlanc, Donald A. Walter, Kathryn M. Hess, Douglas B. Kent, Richard L. Smith
2003, Water-Resources Investigations Report 2002-4306
The discharge of a plume of sewagecontaminated ground water emanating from the Massachusetts Military Reservation to Ashumet Pond on Cape Cod, Massachusetts, has caused concern about excessive loading of nutrients, particularly phosphorus, to the pond. The U.S. Air Force is considering remedial actions to mitigate potentially adverse effects on the...
Uncertainty in spatially explicit animal dispersal models
Wolf M. Mooij, Donald L. DeAngelis
2003, Ecological Applications (13) 794-805
Uncertainty in estimates of survival of dispersing animals is a vexing difficulty in conservation biology. The current notion is that this uncertainty decreases the usefulness of spatially explicit population models in particular. We examined this problem by comparing dispersal models of three levels of complexity: (1) an event-based binomial model...
A procedure for quantitation of total oxidized uranium for bioremediation studies
Dwayne A. Elias, John M. Senko, Lee R. Krumholz
2003, Journal of Microbiological Methods (53) 343-353
A procedure was developed for the quantitation of complexed U(VI) during studies on U(VI) bioremediation. These studies typically involve conversion of soluble or complexed U(VI) (oxidized) to U(IV) (the reduced form which is much less soluble). Since U(VI) freely exchanges between material adsorbed to the solid phase and the...
A longitudinal assessment of the aquatic macroinvertebrate community in the channelized lower Missouri River
Barry C. Poulton, Mark L. Wildhaber, Collette S. Charbonneau, James F. Fairchild, Brad G. Mueller, Christopher J. Schmitt
2003, Environmental Monitoring and Assessment (85) 23-53
We conducted an aquatic macroinvertebrate assessment in the channelized reach of the lower Missouri River, and used statistical analysis of individual metrics and multimetric scores to identify community response patterns and evaluate relative biological condition. We examined longitudinal site differences that are potentially associated with water qualityrelated factors originating from...
Comparison of salinity and temperature at continuous monitoring stations and nearby monthly measurement sites in San Francisco Bay
L.G. Bergfeld, D. H. Schoellhamer
2003, Interagency Ecological Program Newsletter 5-12
Salinity and temperature are crucial state variables affecting estuarine habitat an d, thus, are measured by various San Francisco Estuary programs. This article presents a comparison of salinity and temperature data collected at seven continuo us monitoring stations throughout San Francisco Bay (Figure 1) with data collected monthly by the...
Relations of biological indicators to nutrient data for lakes and streams in Pennsylvania and West Virginia, 1990-98
Robin A. Brightbill, Edward H. Koerkle
2003, Water-Resources Investigations Report 2003-4033
The Clean Water Action Plan of 1998 provides a blueprint for federal agencies to work with states, tribes, and other stakeholders to protect and restore the Nation's water resources. The plan includes an initiative that addresses the nutrient-enrichment problem of lakes and streams across the United States. The U.S. Environmental...
Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group: Determination of acetamide herbicides and their degradation products in water using online solid-phase extraction and liquid chromatography/mass spectrometry
E.A. Lee, A.P. Strahan
2003, Open-File Report 2003-173
An analytical method for the determination of 6 acetamide herbicides (acetochlor, alachlor, dimethenamid, flufenacet, metolachlor, and propachlor) and 16 of their degradation products in natural water samples using solid-phase extraction and liquid chromatography/mass spectrometry is described in this report. Special consideration was given during the development of the method to...
Geochemistry, geochronology, mineralogy, and geology suggest sources of and controls on mineral systems in the southern Toquima Range, Nye County, Nevada
Daniel R. Shawe, James D. Hoffman, Bruce R. Doe, Eugene E. Foord, Holly J. Stein, Robert A. Ayuso
2003, Miscellaneous Field Studies Map 2327-C
Geochemistry maps showing the distribution and abundance of 18 elements in about 1,400 rock samples, both mineralized and unmineralized, from the southern Toquima Range, Nev., indicate major structural and lithologic controls on mineralization, and suggest sources of the elements. Radiometric age data, lead mineralogy and paragenesis data, and lead-isotope data...
Sediment dynamics of a sediment-starved, open-marine marsh embayment: Waccasassa Bay, Florida
Nathan J. Wood, Albert C. Hine
2003, Journal of Coastal Research (19) 574-583
Although the Big Bend region of Florida's Gulf of Mexico coast is considered sediment-starved, the open marine marshes that characterize the area are keeping pace with sea level rise. Waccasassa Bay, an embayment within this region, also contains unique subtidal mudbanks that thicken with increasing proximity to embayment head,...
Water-quality trend analysis and sampling design for streams in North Dakota, 1971-2000
Aldo V. Vecchia
2003, Water-Resources Investigations Report 2003-4094
This report presents the results of a study conducted by the U.S. Geological Survey, in cooperation with the North Dakota Department of Health, to analyze historical water-quality trends in selected dissolved major ions, nutrients, and dissolved trace metals for 10 streams in southwestern and eastern North Dakota and to develop...