Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
Filter Total Items: 5599
Utilization of the gypsum from a wet limestone flue gas desulfurization process Utilization of the gypsum from a wet limestone flue gas desulfurization process
The authors have been developing a process which converts FGD-gypsum to ammonium sulfate fertilizer with precipitated calcium carbonate as a by-product during the conversion. Preliminary cost estimates suggest that the process is economically feasible when ammonium sulfate crystals are produced in a granular size (1.2 to 3.3 mm), instead of a powder form. However, if additional revenue...
Authors
I.-M. Chou, V. Patel, J.M. Lytle, S.J. Chou, R.H. Carty
Water professionals and water policy in the Black Hills region Water professionals and water policy in the Black Hills region
A case study approach based on examples from the Black Hills region is used to evaluate the role of water professionals in developing feasible and fair public policy involving water resources. Examples presented include a long-term hydrologic investigation in the Black Hills, a local wellhead protection program, issues being addressed by a local flood management commission, coordination...
Authors
T.A. Fontaine, D.G. Driscoll, J.W. Erickson, S.J. Kenner, J.F. Sawyer
Working group on future trends Working group on future trends
This working group did not divide into subgroups, and its report consists of a unified document in a format somewhat different than those of the other working groups. The group considered four major topics: (1) projected "new" contaminants of future concern; (2) future trends with contaminants currently known to be issues for marine mammals; (3) future needs to improve and insure...
Authors
U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain
No abstract available.
Authors
Leonid A. Neymark, Y. V. Amelin, James B. Paces, Zell E. Peterman
Secondary minerals record past percolation flux at Yucca Mountain, Nevada Secondary minerals record past percolation flux at Yucca Mountain, Nevada
No abstract available.
Authors
Brian D. Marshall, James B. Paces, Leonid A. Neymark, J. F. Whelan, Zell E. Peterman
Late Quaternary history of Fortymile Wash in the area near the H-road crossing Late Quaternary history of Fortymile Wash in the area near the H-road crossing
No abstract available.
Authors
Scott C. Lundstrom, James B. Paces, Shannon A. Mahan
Geochronologic and isotope studies of calcite and silica constraining Quaternary unsaturated- and saturated zone hydrologic flux at Yucca Mountain, Nevada, USA Geochronologic and isotope studies of calcite and silica constraining Quaternary unsaturated- and saturated zone hydrologic flux at Yucca Mountain, Nevada, USA
Both unsaturated- and saturated-zone aqueous solutions are capable of precipitating secondary mineral deposits that document the history and origins of past water flux. Calcite and opal occur as thin coatings on open fractures and cavity floors within the thick unsaturated zone at Yucca Mountain. Outermost surfaces of calcite have 14C ages of between 44,000 and 16,000 radiocarbon years...
Authors
James B. Paces, Zell E. Peterman, Leonid A. Neymark, Joseph F. Whelan, Brian D. Marshall
Evaluation of geologic radon potential in two regions in southwestern and southern Poland Evaluation of geologic radon potential in two regions in southwestern and southern Poland
No abstract available.
Authors
Ryszard Strzelecki, Stanislaw Wolkowicz, Wojciech Wolkowicz, Kalina Mamont-Ciesa, D.G. Mose, Zoltan Szabo, Tamara I. Ivahnenko, G.W. Mushrush
Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer
Reflection-mode borehole radar and transmission-mode radar tomograms image heterogeneity in the electromagnetic properties of rock. Heterogeneity may be produced by interfaces between different rock types, foliation, and fracturing. In crystalline rock, hydraulic flow is primarily through fracture networks rather than through the rock matrix. Borehole radar methods have been applied to...
Authors
David L. Wright, John W. Lane
Use of multi-offset borehole-radar reflection method in fractured crystalline bedrock at Mirror Lake, Grafton County, New Hampshire Use of multi-offset borehole-radar reflection method in fractured crystalline bedrock at Mirror Lake, Grafton County, New Hampshire
Multi-offset, single-hole, borehole-radar reflection surveys were conducted at the U.S. Geological Survey Fractured Rock Research Site at Mirror Lake, in Grafton County, New Hampshire. The study was conducted to evaluate the benefits of applying multi-offset seismic processing techniques to borehole-radar reflection surveys in fractured rock. The multi-offset reflection surveys were...
Authors
John W. Lane, F.P. Haeni, Roelof J. Versteeg
Use of time-lapse attenuation-difference radar tomography methods to monitor saline tracer transport in fractured crystalline bedrock Use of time-lapse attenuation-difference radar tomography methods to monitor saline tracer transport in fractured crystalline bedrock
No abstract available.
Authors
John W. Lane, F.P. Haeni, Frederick D. Day-Lewis
Assessing groundwater vulnerability using logistic regression Assessing groundwater vulnerability using logistic regression
Determining the likelihood that groundwater contains elevated concentrations of contaminants can help water resource managers protect drinking water supplies. For example, this information is useful for selecting new sites for drinking water sources and designing more cost-effective monitoring strategies for existing sources. Groundwater vulnerability has typically been assessed using...
Authors
Anthony J. Tesoriero, E. L. Inkpen, Frank D. Voss