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Page 2778, results 69426 - 69450

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Preliminary analyses for perchlorate in selected natural materials and their derivative products
G. J. Orris, G. J. Harvey, D. T. Tsui, J. E. Eldrige
2003, Open-File Report 2003-314
Increasing concern about sources of perchlorate contamination in ground and surface waters has led to interest in identifying potential sources of natural perchlorate and products derived from these natural sources. To date, most perchlorate found in ground and surface waters has been attributed to its major uses as an oxidizer...
Geologic map and digital database of the Redlands 7.5' quadrangle, San Bernardino and Riverside Counties, California
Jonathan C. Matti, Douglas M. Morton, Brett F. Cox, Katherine J. Kendrick, Pamela M. Cossette, Bradley Jones, Stephen A. Kennedy
2003, Open-File Report 2003-302
This geologic database of the Redlands 7.5' quadrangle was prepared by the Southern California Areal Mapping Project (SCAMP), a regional geologic-mapping project sponsored jointly by the U.S. Geological Survey and the California Geological Survey. The database was developed as a contribution to the National Cooperative Geologic Mapping Program's National Geologic...
Hydrogeologic factors that influence ground water movement in the desert southwest United States
Frank C. Chuang, Edwin H. McKee, Keith A. Howard
2003, Open-File Report 2003-294
A project to study ground-water and surface-water interactions in the desert southwestern United States was initiated in 2001 by the Tucson, Arizona office of the Water Resources Division, U.S. Geological Survey (USGS). One of the goals of the Southwest Ground-water Resources Project was to develop a regional synthesis that includes...
Publications of the Western Earth Surface Processes Team 2002
Charles Powell II, R. W. Graymer
2003, Open-File Report 2003-363
The Western Earth Surface Processes Team (WESPT) of the U.S. Geological Survey (USGS) conducts geologic mapping and related topical earth science studies in the western United States. This work is focused on areas where modern geologic maps and associated earth-science data are needed to address key societal and environmental issues...
Geologic map of the Big Delta B-2 quadrangle, east-central Alaska
Warren C. Day, John N. Aleinikoff, Paul Roberts, Moira Smith, Bruce M. Gamble, Mitchell W. Henning, Larry P. Gough, Laurie C. Morath
2003, IMAP 2788
New 1:63,360-scale geologic mapping of the Big Delta B-2 quadrangle provides important data on the structural setting and age of geologic units, as well as on the timing of gold mineralization plutonism within the Yukon-Tanana Upland of east-central Alaska. Gold exploration has remained...
A summary report of sediment processes in Chesapeake Bay and watershed
Michael J. Langland, Thomas Cronin, editor(s)
2003, Water-Resources Investigations Report 2003-4123
The Chesapeake Bay, the Nation's largest estuary, has been degraded because of diminished water quality, loss of habitat, and over-harvesting of living resources. Consequently, the bay was listed as an impaired water body due to excess nutrients and sediment. The Chesapeake Bay Program (CBP), a multi-jurisdictional partnership, completed an agreement...
Simulation of ground-water flow in the Cedar River alluvium, northwest Black Hawk County and southwest Bremer County, Iowa
Bryan D. Schaap, Mark E. Savoca, Michael J. Turco
2003, Water-Resources Investigations Report 2003-4080
Flooding and high ground-water levels after large or frequent rainstorms have occurred in an area of about 30 square miles along the eastern bank of the Cedar River from Cedar Falls in northwest Black Hawk County to Janesville in southwest Bremer County, Iowa. The U.S. Geological Survey, in cooperation with...
Association of deformation and fluid events in the central Brooks Range fold-and-thrust belt, Northern Alaska
Thomas E. Moore, Christopher J. Potter, Paul B. O'Sullivan, Kevin L. Shelton, Michael B. Underwood
2003, Open-File Report 2003-327
Ocentral Brooks Range consists of two superposed north-directed contractional orogens, one formed between 140-120 Ma and the other at ~60-45 Ma. The older orogen was an arc-continent collisional zone characterized by far-traveled allochthons and relatively low structural relief. The younger orogen is a retroarc thrust belt with relatively low amounts...
Shaded relief aeromagnetic map of the Santa Clara Valley and vicinity, California
Carter W. Roberts, Robert C. Jachens
2003, Open-File Report 2003-360
This aeromagnetic map covers the southern portion of San Francisco Bay, the Santa Clara Valley and surrounding mountains, part of which has been modelled in threedimensions (Jachens and other, 2001). The magnetic anomaly map has been compiled from existing digital data. Data was obtained from six aeromagnetic surveys that were...
A stage-normalized function for the synthesis of stage-discharge relations for the Colorado River in Grand Canyon, Arizona
Stephen M. Wiele, Margaret Torizzo
2003, Water-Resources Investigations Report 2003-4037
A method was developed to construct stage-discharge rating curves for the Colorado River in Grand Canyon, Arizona, using two stage-discharge pairs and a stage-normalized rating curve. Stage-discharge rating curves formulated with the stage-normalized curve method are compared to (1) stage-discharge rating curves for six temporary stage gages and two streamflow-gaging...
Chromium geochemistry of serpentinous sediment in the Willow core, Santa Clara County, California
Christopher J. Oze, Matthew J. LaForce, Carl M. Wentworth, Randall T. Hanson, Dennis K. Bird, Robert G. Coleman
2003, Open-File Report 2003-251
A preliminary investigation of Cr geochemistry in serpentinous sediment completed for a multiple-aquifer ground-water monitoring well (Willow core of Santa Clara County, CA) determined sediment at depths >225 meters contains Cr concentrations ranging from 195 to 1155 mg/kg. Serpentinous sediment from this site is a potential source of non-anthropogenic Cr...
LakeVOC; A Deterministic Model to Estimate Volatile Organic Compound Concentrations in Reservoirs and Lakes
David A. Bender, William E. Asher, John S. Zogorski
2003, Open-File Report 2003-212
This report documents LakeVOC, a model to estimate volatile organic compound (VOC) concentrations in lakes and reservoirs. LakeVOC represents the lake or reservoir as a two-layer system and estimates VOC concentrations in both the epilimnion and hypolimnion. The air-water flux of a VOC is characterized in LakeVOC in terms of...
Aquifer Susceptibility in Virginia: Data on Chemical and Isotopic Composition, Recharge Temperature, and Apparent Age of Water from Wells and Springs, 1998-2000
David L. Nelms, George E. Harlow Jr.
2003, Open-File Report 2003-246
The determination of aquifer susceptibility to contamination from near-surface sources by the use of ground-water dating techniques is a critical part of Virginia's Source Water Assessment Program. As part of the Virginia Aquifer Susceptibility study, water samples were collected between 1998 and 2000 from 145 wells and 6 springs in...
Texture, Carbonate Content, and Preliminary Maps of Surficial Sediments of the Flower Garden Banks Area, Northwestern Gulf of Mexico Outer Shelf
Kathryn M. Scanlon, Seth D. Ackerman, Jill E. Rozycki
2003, Open-File Report 2003-2
The purpose of this report is to release texture and carbonate content analyses of 107 seafloor sediments collected within and near the East and West Flower Garden Banks areas of the Sanctuary and to show relationships between these data and existing bathymetric data. The sediment data, in conjunction with previously...
Archive of boomer seismic reflection data collected during USGS cruises 01SCC01 and 01SCC02, Timbalier Bay and offshore East Timbalier Island, Louisiana, June - August, 2001
Karynna Calderon, Shawn V. Dadisman, James G. Flocks, Jack L. Kindinger, Dana S. Wiese
2003, Open-File Report 2003-274
In June, July, and August of 2001, the U.S. Geological Survey (USGS), in cooperation with the University of New Orleans (UNO), the U.S. Army Corps of Engineers, and the Louisiana Department of Natural Resources, conducted a shallow geophysical and sediment core survey of Timbalier Bay and the Gulf of Mexico...
Water-quality and algal conditions in the Clackamas River basin, Oregon, and their relations to land and water management
Kurt D. Carpenter
2003, Water-Resources Investigations Report 2002-4189
In 1998, the U.S. Geological Survey sampled the Clackamas River, its major tributaries, and reservoirs to characterize basic water quality (nutrients, dissolved oxygen, pH, temperature, and conductance), water quantity (water sources within the basin), and algal conditions (biomass and species composition). Sampling locations reflected the dominant land uses in the...
Geochemistry of bedrock and glacial deposits in the vicinity of the Bend massive sulfide deposit, north central Wisconsin
Laurel G. Woodruff, John W. Attig, William F. Cannon, Suzanne W. Nicholson, Klaus Schulz
2003, Open-File Report 2003-353
In 1998 the U.S. Geological Survey (USGS) initiated a study to examine the natural regional environmental impact of sulfide mineralization exposed to episodic weathering and glaciation. The study focused on the Bend copper-gold massive sulfide deposit located in the Medford District of the Chequamegon National Forest in north central Wisconsin....
Maps Showing Inundation Depths, Ice-Rafted Erratics, and Sedimentary Facies of Late Pleistocene Missoula Floods in the Willamette Valley, Oregon
J.M. Minervini, J. E. O’Connor, R.E. Wells
2003, Open-File Report 2003-408
Glacial Lake Missoula, impounded by the Purcell Trench lobe of the late Pleistocene Cordilleran Icesheet, repeatedly breached its ice dam, sending floods as large as 2,500 cubic kilometers racing across the Channeled Scabland and down the Columbia River valley to the Pacific Ocean. Peak discharges for some floods exceeded 20...