Determination of methyl mercury by aqueous phase ethylation, followed by gas chromatographic separation with cold vapor atomic fluorescence detection
John F. De Wild, Mark L. Olsen, Shane D. Olund
2002, Open-File Report 2001-445
A recent national sampling of streams in the United States revealed low methyl mercury concentrations in surface waters. The resulting median and mean concentrations, calculated from 104 samples, were 0.06 nanograms per liter (ng/L) and 0.15 ng/L, respectively. This level of methyl mercury in surface water in the United States...
Trace, minor and major element data for ground water near Fairbanks, Alaska, 1999-2000
S. H. Mueller, R.J. Goldfarb, G. L. Farmer, R. Sanzolone, M. Adams, P. M. Theodorakos, S.A. Richmond, R. Blaine McCleskey
2002, Open-File Report 2002-90
No abstract available....
Effects of water-management alternatives on streamflow in the Ipswich River basin, Massachusetts
Philip J. Zarriello
2002, Open-File Report 2001-483
Management alternatives that could help mitigate the effects of water withdrawals on streamflow in the Ipswich River Basin were evaluated by simulation with a calibrated Hydrologic Simulation Program--Fortran (HSPF) model. The effects of management alternatives on streamflow were simulated for a 35-year period (1961-95). Most alternatives examined increased low flows...
Hydrostructural maps of the Death Valley regional flow system, Nevada and California
C. J. Potter, D. S. Sweetkind, R. P. Dickerson, M.L. Killgore
2002, Miscellaneous Field Studies Map 2372
The locations of principal faults and structural zones that may influence ground-water flow were compiled in support of a three-dimensional ground-water model for the Death Valley regional flow system (DVRFS), which covers 80,000 square km in southwestern Nevada and southeastern California. Faults include Neogene extensional and strike-slip faults and...
Chemical evolution of the Salton Sea, California: Nutrient and selenium dynamics
Roy A. Schroeder, William H. Orem, Yousif K. Kharaka
2002, Hydrobiologia (473) 23-45
The Salton Sea is a 1000-km2 terminal lake located in the desert area of southeastern California. This saline (∼44 000 mg l−1 dissolved solids) lake started as fresh water in 1905–07 by accidental flooding of the Colorado River, and it is maintained by agricultural runoff of irrigation water diverted from the...
Simulation of a proposed emergency outlet from Devils Lake, North Dakota
Aldo V. Vecchia
2002, Water-Resources Investigations Report 2002-4042
From 1993 to 2001, Devils Lake rose more than 25 feet, flooding farmland, roads, and structures around the lake and causing more than $400 million in damages in the Devils Lake Basin. In July 2001, the level of Devils Lake was at 1,448.0 feet above sea level1, which was...
Preliminary United States-Mexico border watershed analysis, twin cities area of Nogales, Arizona and Nogales, Sonora
Laura Margaret Brady, Floyd Gray, Mario Castaneda, Mark Bultman, Karen Sue Bolm
2002, Open-File Report 2002-112
The United States - Mexico border area faces the challenge of integrating aspects of its binational physical boundaries to form a unified or, at least, compatible natural resource management plan. Specified geospatial components such as stream drainages, mineral occurrences, vegetation, wildlife, and land-use can be analyzed in terms of their...
Fate of carbon in Alaskan Landscapes Project: Database for soils from eddy covariance tower sites, Delta Junction, AK
Stagg King, Jennifer Harden, Kristen L. Manies, Jennie Munster, L. Douglas White
2002, Open-File Report 2002-62
Soils in Alaska, and in high latitude terrestrial ecosystems in general, contain significant amounts of organic carbon, most of which is believed to have accumulated since the start of the Holocene about 10 ky before present. High latitude soils are estimated to contain 30-40% of terrestrial soil carbon (Melillo et...
The road to flamingo: An evaluation of flow pattern alterations and salinity intrusion in the lower glades, Everglades National Park
M.A. Stewart, T.N. Bhatt, R.J. Fennema, D.V. Fitterman
2002, Open-File Report 2002-59
Introduction This report describes the history of roads through the Lower Glades of Everglades National Park, Florida and their influence on salinity intrusion. The chronology that lead to this work is interesting. The U.S. Geological Survey flew a series of helicopter electromagnetic surveys over portions of Everglades National Park to...
Pesticides in surface water of the Yakima River basin, Washington, 1999–2000 — Their occurrence and an assessment of factors affecting concentrations and loads
James C. Ebbert, Sandra S. Embrey
2002, Water-Resources Investigations Report 2001-4211
The occurrence, distribution, and transport of pesticides in surface water of the Yakima River Basin were assessed using data collected during 19992000 as part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. Samples were collected at 34 sites located throughout the basin in August 1999 using a Lagrangian...
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of wastewater compounds by polystyrene-divinylbenzene solid-phase extraction and capillary-column gas chromatography/mass spectrometry
Steven D. Zaugg, Steven G. Smith, Michael P. Schroeder, Larry B. Barber, Mark R. Burkhardt
2002, Water-Resources Investigations Report 2001-4186
A method for the determination of 67 compounds typically found in domestic and industrial wastewater is described. The method was developed in response to increasing concern over the impact of endocrine-disrupting chemicals in wastewater on aquatic organisms. This method also may be useful for evaluating the impact of combined sanitary...
Chromium isotopes and the fate of hexavalent chromium in the environment
Andre S. Ellis, Thomas M. Johnson, Thomas D. Bullen
2002, Science (295) 2060-2062
Measurements of chromium (Cr) stable-isotope fractionation in laboratory experiments and natural waters show that lighter isotopes reacted preferentially during Cr(VI) reduction by magnetite and sediments. The 53Cr/52Cr ratio of the product was 3.4 ± 0.1 per mil less than that of the reactant.53Cr/52Cr shifts in water samples indicate the extent...
Discharge measurements using a broad-band acoustic Doppler current profiler
Michael R. Simpson
2002, Open-File Report 2001-1
The measurement of unsteady or tidally affected flow has been a problem faced by hydrologists for many years. Dynamic discharge conditions impose an unreasonably short time constraint on conventional current-meter discharge-measurement methods, which typically last a minimum of 1 hour. Tidally affected discharge can change more than 100 percent during...
Chemistry of selected high-elevation lakes in seven national parks in the western United States
David W. Clow, Robert G. Striegl, Leora Nanus, M. Alisa Mast, Donald H. Campbell, David P. Krabbenhoft
2002, Water, Air, and Soil Pollution: Focus (2) 139-164
A chemical survey of 69 high-altitude lakes in seven national parks in the western United States was conducted during the fallof 1999; the lakes were previously sampled during the fall of 1985, as part of the Western Lake Survey. Lakes in parks in the Sierra/southern Cascades (Lassen Volcanic, Yosemite, Sequoia/Kings...
Simulating solute transport across horizontal-flow barriers using the MODFLOW ground-water transport process
G.Z. Hornberger, Leonard F. Konikow, P. T. Harte
2002, Open-File Report 2002-52
No abstract available....
Geologic, hydrologic, and water-quality data from multiple-well monitoring sites in the Central and West Coast basins, Los Angeles County, California, 1995-2000
Michael Land, R.R. Everett, S.M. Crawford
2002, Open-File Report 2001-277
In 1995, the U.S. Geological Survey (USGS), in cooperation with the Water Replenishment District of Southern California (WRDSC), began a study to examine ground-water resources in the Central and West Coast Basins in Los Angeles County, California. The study characterizes the geohydrology and geochemistry of the regional ground-water...
Magnetotelluric data in the middle Rio Grande basin, Albuquerque volcanoes, New Mexico
Jackie M. Williams, Brian D. Rodriguez
2002, Open-File Report 2002-44
The population in the Albuquerque-Santa Fe region of New Mexico is rapidly growing. The Santa Fe Group aquifer in the Middle Rio Grande Basin is the main source of municipal water for the greater Albuquerque metropolitan area. The capacity of this aquifer is more limited than previously thought (Thorn et...
Exploring the effect of drought extent and interval on the Florida snail kite: Interplay between spatial and temporal scales
Wolf M. Mooij, Robert E. Bennetts, Wiley M. Kitchens, Donald L. DeAngelis
2002, Ecological Modelling (149) 25-39
The paper aims at exploring the viability of the Florida snail kite population under various drought regimes in its wetland habitat. The population dynamics of snail kites are strongly linked with the hydrology of the system due to the dependence of this bird species on one exclusive prey species, the...
In-situ evidence for uranium immobilization and remobilization
John M. Senko, Jonathan D. Istok, Joseph M. Suflita, Lee R. Krumholz
2002, Environmental Science & Technology (36) 1491-1496
The in-situ microbial reduction and immobilization of uranium was assessed as a means of preventing the migration of this element in the terrestrial subsurface. Uranium immobilization (putatively identified as reduction) and microbial respiratory activities were evaluated in the presence of exogenous electron donors and acceptors with field push−pull tests using...
Ground-water discharge determined from measurements of evapotranspiration, other available hydrologic components, and shallow water-level changes, Oasis Valley, Nye County, Nevada
S. R. Reiner, R. J. Laczniak, G. A. DeMeo, J. LaRue Smith, P. E. Elliott, W. E. Nylund, C. J. Fridrich
2002, Water-Resources Investigations Report 2001-4239
Oasis Valley is an area of natural ground-water discharge within the Death Valley regional ground-water flow system of southern Nevada and adjacent California. Ground water discharging at Oasis Valley is replenished from inflow derived from an extensive recharge area that includes the northwestern part of the Nevada Test Site (NTS)....
Assessing five national priorities in water resources
William Wilber, C. A. Couch
2002, Water Resources Impact (4) 17-21
In 2001, the National Water-QualityAssessment (NAWQA) Program of the U.S. Geological Survey (USGS) began its second decade of studies. A total of 42 study units (major river basins and aquifers across the nation) will be reassessed in three groups of 14 on a rotating schedule. Each...
Stormflow-hydrograph separation based on isotopes: the thrill is gone--what's next?
Douglas A. Burns
2002, Hydrological Processes (16) 1515-1517
Beginning in the 1970s, the promise of a new method for separatingstormflow hydrographs...
Hydrologic controls on the subsurface transport of oil-field brine at the Osage-Skiatook Petroleum Environmental Research (OSPER) B Site, Oklahoma
William N. Herkelrath, Yousif K. Kharaka
2002, Conference Paper, 9th International Petroleum Environmental Conference
As a part of a multidisciplinary study of the impact of oil wells and oil production on the environment, we are investigating the hydrology of the OSPER B site, which is located at Skiatook Lake in Osage County, Oklahoma. Salt and crude oil from oil well brine pits and accidental...
Preliminary geophysical characterization of two oil production sites, Osage County, Oklahoma - Osage Skiatook Petroleum Environmental Research Project
Bruce D. Smith, Robert J. Bisdorf, Robert Horton, James K. Otton, Raymond S. Hutton
2002, Conference Paper, 9th International Petroleum Environmental Conference
Ground electromagnetic and dc resistivity geophysical surveys were used to interpret the subsurface distribution of salinized soil, water, and bedrock at two sites (A and B) and to characterize the larger scale hydrologic setting. Measurements were made on grids of about 1000 square meters using a very shallow penetrating (less...
Aggregate stability and size distribution
John R. Nimmo, K. Perkins
Jacob H. Dane, G. Clarke Topp, editor(s)
2002, Book chapter, Methods of soil analysis, part 4, physical methods
No abstract available. ...
