Nonpoint sources of pesticides in the San Joaquin River, California; input from winter storms, 1992-93
Joseph L. Domagalski
1995, Open-File Report 95-165
Organophosphate insecticides, including chlor- pyrifos, diazinon, and methidathion, are applied to dormant orchards in the San Joaquin Valley, California, during late December through January. This time frame coincides with the period of heaviest rainfall in the valley, and rainfall mobilizes a portion of these pesticides from the orchards. The pesticides...
Hydrologic conditions, habitat characteristics, and occurrence of fishes in the Apalachicola River floodplain, Florida; second annual report of progress, October 1993-September 1994
Helen M. Light, Melanie R. Darst, J. W. Grubbs
1995, Open-File Report 95-167
This report describes progress and interim results of the second year of a 4-year study. The purpose of the 4-year study is to describe aquatic habitat types in the Apalachicola River floodplain and quantify the amount of habitat inundated by the river at various stages. Final results will be used...
Intercomparison experiments on dissolved trace-metal data from the Mississippi River and some of its tributaries, 1989-90
Howard E. Taylor, A.M. Shiller, J.R. Garbarino, T.I. Brinton
1995, Open-File Report 93-628
No abstract available....
Water-related scientific activities of the U.S. Geological Survey in Nevada, fiscal years 1993-94
M. Teresa Foglesong (compiler)
1995, Open-File Report 95-126
The U.S. Geological Survey has been collecting water-resources data in Nevada since 1890. Most of the projects that constitute the current Nevada District program can be classified as either basic- data acquisition (about 25 percent) or hydrologic interpretation (about 75 percent). About 39 percent of the activities are supported by...
A feasibility study to estimate minimum surface-casing depths of oil and gas wells to prevent ground-water contamination in four areas of western Pennsylvania
T. F. Buckwalter, P. J. Squillace
1995, Water-Resources Investigations Report 87-4136
Hydrologic data were evaluated from four areas of western Pennsylvania to estimate the minimum depth of well surface casing needed to prevent contamination of most of the fresh gr6unct-water resources by oil and gas wells. The areas are representative of the different types of oil and gas activities and of...
Hydrogeology of south-central St. Croix, U.S. Virgin Islands
R. P. Graves
1995, Water-Resources Investigations Report 93-4162
The subsurface geology of south-central St. Croix consists of alluvium and underlying carbonate rocks. The alluvial deposits consist of sand and gravel with cobbles and boulders and, locally, thin lenses of silt and clay. The carbonate rocks consist of the Oligocene to Middle Miocene age Jealousy formation, the Miocene and...
Effects of surface mining on the hydrology and biology in the Stony Fork basin, Fayette County, Pennsylvania, 1978-85
D.R. Williams, J.R. Ritter, T.M. Mastrilli
1995, Water-Resources Investigations Report 94-4056
The effects of surface coal mining on the water quality, sediment discharge, and aquatic biology of streams in the Stony Fork Basin in southwestern Pennsylvania were studied from 1978 through 1985. Data were collected at five stream sites and one mine discharge site. Field data included streamflow, temperature, specific conductance,...
Methane production and consumption monitored by stable H and C isotope ratios at a crude oil spill site, Bemidji, Minnesota
Kinga Revesz, Tyler B. Coplen, Mary J. Baedecker, Pierre D. Glynn
1995, Applied Geochemistry (10) 505-516
Stable isotopic ratios of C and H in dissolved CH4 and C in dissolved inorganic C in the ground water of a crude-oil spill near Bemidji, Minnesota, support the concept of CH4production by acetate fermentation with a contemporaneous increase in HCO3−concentration. Methane concentrations in the saturated zone decrease from 20.6...
Estimating 14C groundwater ages in a methanogenic aquifer
Ramon Aravena, Leonard I Wassenaar, Niel Plummer
1995, Water Resources Research (31) 2307-2317
This paper addresses the problem of 14C age dating of groundwaters in a confined regional aquifer affected by methanogenesis. Increasing CH4 concentrations along the groundwater flow system and 13C and 14C isotopic data for dissolved inorganic carbon, dissolved organic carbon, and CH4 clearly show the effect of methanogenesis on groundwater chemistry. Inverse reaction path modeling...
Gross-beta activity in ground water: natural sources and artifacts of sampling and laboratory analysis
Alan H. Welch, Zoltan Szabo, David L. Parkhurst, Peter C. Van Metre, Ann H. Mullin
1995, Applied Geochemistry (10) 491-503
Gross-beta activity has been used as an indicator of beta-emitting isotopes in water since at least the early 1950s. Originally designed for detection of radioactive releases from nuclear facilities and weapons tests, analysis of gross-beta activity is widely used in studies of naturally occurring radioactivity in ground water. Analyses of...
State-dependent anisotrophy: Comparison of quasi-analytical solutions with stochastic results for steady gravity drainage
Timothy R. Green, David L. Freyberg
1995, Water Resources Research (31) 2201-2211
Anisotropy in large-scale unsaturated hydraulic conductivity of layered soils changes with the moisture state. Here, state-dependent anisotropy is computed under conditions of large-scale gravity drainage. Soils represented by Gardner's exponential function are perfectly stratified, periodic, and inclined. Analytical integration of Darcy’s law across each layer results in a system of...
Combined use of groundwater dating, chemical, and isotopic analyses to resolve the history and fate of nitrate contamination in two agricultural watersheds, Atlantic coastal plain, Maryland
J.K. Böhlke, J. M. Denver
1995, Water Resources Research (31) 2319-2339
The history and fate of groundwater nitrate (NO3−) contamination were compared in 2 small adjacent agricultural watersheds in the Atlantic coastal plain by combined use of chronologic (CCl2F2, 3H), chemical (dissolved solids, gases), and isotopic (δ15N,δ13C, δ34S) analyses of recharging groundwaters, discharging groundwaters, and surface waters. The results demonstrate the interactive...
Geometry of sorbed arsenate on ferrihydrite and crystalline FeOOH: Re-evaluation of EXAFS results and topological factors in predicting sorbate geometry, and evidence for monodentate complexes
Glenn A. Waychunas, James A. Davis, Christopher C. Fuller
1995, Geochimica et Cosmochimica Acta (59) 3655-3661
Manceau's (1995) reinterpretation of some of our EXAFS results (Waychunas et al., 1993) has been analyzed using both old and newly collected data in an attempt to clarify the nature of proposed monodentate and edge-sharing bidentate arsenate complexes on the ferrihydrite surface. It is shown that EXAFS analysis utilizing data...
Simulated monthly hydrologic data and estimated flood characteristics for Cherry Creek at a proposed reservoir site near Terry, Montana
Charles Parrett, D.R. Johnson
1995, Water-Resources Investigations Report 94-4230
Methods used to simulate a monthly hydrologic budget for water years 1937-92 for the proposed Cherry Creek Reservoir (maximum volume about 14,100 acre-feet) are described and monthly results of the simulation are presented. The budget is based on recorded and estimated streamflow, precipitation, evaporation, and estimated reservoir seepage. The budget...
Spatial data in geographic information system format on agricultural chemical use, land use, and cropping practices in the United States
William A. Battaglin, Donald A. Goolsby
1995, Water-Resources Investigations Report 94-4176
The spatial data in geographic information system format described in this report consist of estimates for all counties in the conterminous United States of the annual use of 96 herbicides in 1989; annual sales of nitrogen fertilizer, in tons, for 1985-91; and agricultural expenses, land use, chemical use, livestock holdings,...
Hydrology and relation of selected water-quality constituents to selected physical factors in Dakota County, Minnesota, 1990-91
J.E. Almendinger, G.B. Mitton
1995, Water-Resources Investigations Report 94-4207
Selected water-quality constituents were determined in water from 5 surface-water sites and 29 wells in Dakota County, Minnesota, to search for possible relations to selected physical factors, including waste-water discharge, agricultural land, Quaternary deposits, bedrock, soil-leaching potential, and water-table depth. All surface-water samples were from the Vermillion River Basin, whose...
Simulation of ground-water flow in the Albuquerque Basin, central New Mexico, 1901-1994, with projections to 2020
J. M. Kernodle, D. P. McAda, C. R. Thorn
1995, Water-Resources Investigations Report 94-4251
This report describes a three-dimensional finite-difference ground-water-flow model of the Santa Fe Group aquifer system in the Albuquerque Basin, which comprises the Santa Fe Group (late Oligocene to middle Pleistocene age) and overlying valley and basin-fill deposits (Pleistocene to Holocene age). The model is designed to...
Selected hydrologic data for Juab Valley, Utah, 1935-94
Judy I. Steiger
1995, Open-File Report 95-101
This report contains selected hydrologic data collected in Juab Valley, Utah, from 1935 to 1994. The study area is in eastern Juab County in central Utah. The area is bounded on the east by the Wasatch Range and San Pitch Mountains and on the west by Long Ridge and West...
Selected hydrologic data for the Bonneville Salt Flats and Pilot Valley, western Utah, 1991-93
James L. Mason, William C. Brothers, Linda J. Gerner, Pamela S. Muir
1995, Open-File Report 95-104
This report contains hydrologic data collected during 1991-93 in the Bonneville Salt Flats and Pilot Valley study area of western Utah. These data were collected in cooperation with the U.S. Department of the Interior, Bureau of Land Management, as part of a study to investigate possible salt loss from the...
Dissolved pesticide data for the San Joaquin River at Vernalis and the Sacramento River at Sacramento, California, 1991-94
Dorene E. MacCoy, Kathryn L. Crepeau, Kathryn Kuivila
1995, Open-File Report 95-110
Water samples were collected from sites on the San Joaquin and Sacramento Rivers, California and were analyzed for dissolved organic pesticides. This data collection and analysis are a part of an ongoing project by the U.S. Geological Survey Toxic Contaminants Hydrology program to determine the fate and transport of organic...
The Mirror Lake fractured-rock research site: A multidisciplinary research effort in characterizing ground-water flow and chemical transport in fractured rock
Allen M. Shapiro, P. A. Hsieh, Thomas C. Winter
1995, Fact Sheet 138-95
No abstract available....
Selected hydrologic data for the Mesilla ground-water basin, 1987 through 1992 water years, Doña Ana County, New Mexico, and El Paso County, Texas
Edward L. Nickerson
1995, Open-File Report 95-111
The Mesilla ground-water basin monitoring program was established in 1987 to document hydrologic conditions and establish a long-term, continuous data base to permit future quantitative evaluation of the ground-water flow system and stream/aquifer relations. Data collection is divided into three program elements. These are the (1) Mesilla ground- water basin...
Hydrologic data for the Fristoe Unit of the Mark Twain National Forest, southern Missouri, 1988-93
Michael J. Kleeschulte, S. J. Sutley
1995, Open-File Report 95-106
Background hydrologic data were collected from 1988 to 1993 in the Fristoe Unit of the Mark Twain National Forest. Water-quality data collected from area streams, springs, and wells were analyzed using trilinear diagrams, stiff diagrams, boxplots, and summary statistics. The water is a calcium- magnesium-bicarbonate type. Streams generally have slightly...
National Water-Quality Assessment Program; the Allegheny-Monongahela River Basin
Steven D. McAuley
1995, Fact Sheet 137-95
In 1991, the U.S. Geological Survey (USGS) began a National Water-Quality Assessment (NAWQA) program. The three major objectives of the NAWQA program are to provide a consistent description of current water-quality conditions for a large part of the Nation's water resources, define long-term trends in water quality, and identify, describe,...
South Florida Ecosystem Program of the U.S. Geological Survey
Benjamin F. McPherson, Aaron L. Higer, Sarah Gerould, Irwin H. Kantrowitz
1995, Fact Sheet 134-95
IntroductionThe South Florida Ecosystem Program is one of several study areas within the USGS Ecosystem Program. The Ecosystem Program was established to enable the USGS to enhance its scientific assistance to resource managers who require an improved scientific information base to resolve or prevent complex resource conflicts or environmental problems...
