A strategy for delineating the area of ground-water contribution to wells completed in fractured bedrock aquifers in Pennsylvania
D. W. Risser, G. J. Barton
1995, Water-Resources Investigations Report 95-4033
Delineating a contributing area to a well completed in a fractured bedrock aquifer in Pennsylvania is difficult because the hydrogeologic characteristics of fractured rocks are extremely complex. Because of this complexity, a single method or technique to delineate a contributing area will not be applicable for all wells completed in...
Seismicity patterns in southern California before and after the 1994 Northridge earthquake: A preliminary report
Paul A. Reasenberg
1995, Open-File Report 95-484
No abstract available....
Overview of environmental and hydrogeologic conditions at Bettles Field, Alaska
James R. Cowan
1995, Open-File Report 95-343
Overview of environmental and hydrogeologic conditions at Wrangell, Alaska
Eppie V. Hogan
1995, Open-File Report 95-344
Geologic map of Morrill County, Nebraska
J. B. Swinehart, R. F. Diffendal Jr., C.C. Swisher
1995, IMAP 2496
Overview of environmental and hydrogeologic conditions near Petersburg, Alaska
Eppie V. Hogan
1995, Open-File Report 95-342
Modeling hexavalent chromium reduction in groundwater in field-scale transport and laboratory batch experiments
J.C. Friedly, J.A. Davis, D.B. Kent
1995, Water Resources Research (31) 2783-2794
A plausible and consistent model is developed to obtain a quantitative description of the gradual disappearance of hexavalent chromium (Cr(VI)) from groundwater in a small-scale field tracer test and in batch kinetic experiments using aquifer sediments under similar chemical conditions. The data exhibit three distinct timescales. Fast reduction occurs in...
Quality of water and chemistry of bottom sediment in the Rillito Creek basin, Tucson, Arizona, 1992-93
Saeid Tadayon
1995, Water-Resources Investigations Report 95-4062
Physical and chemical data were collected from four surface-water sites, six ground-water sites, and two bottom-sediment sites during 1992-93. Specific conductance, hardness, alkalinity, and dissolved- solids concentrations generally were higher in ground water than in surface water. The median concentrations of dissolved major ions, with the exception of potassium, were...
Characterization of secondary minerals formed as the result of weathering of the Anakeesta Formation, Alum Cave, Great Smoky Mountains National Park, Tennessee
Marta J. Flohr, Roberta G. Dillenburg, Geoffrey S. Plumlee
1995, Open-File Report 95-477
Bridge-scour analysis on Cuchillo Negro Creek at the Interstate 25 crossing near Truth or Consequences, New Mexico
S. D. Waltemeyer
1995, Water-Resources Investigations Report 95-4050
A sediment-transport model to simulate channel change was applied to a 1-mile reach of Cuchillo Negro Creek at the Interstate 25 crossing at Truth or Consequences, New Mexico, using the Bridge-Stream Tube model for Alluvial River Simulation (BRI-STARS). The 500-year flood discharge was estimated to be 10,700 cubic feet per...
Geophysical logs and groundwater chemistry in the A/M area, interim report, Savannah River Site, South Carolina
Philip H. Nelson, J. E. Kibler
1995, Open-File Report 95-507
Concentrations of mercury and other trace elements in walleye, smallmouth bass, and rainbow trout in Franklin D. Roosevelt Lake and the upper Columbia River, Washington, 1994
M.D. Munn, S.E. Cox, C.J. Dean
1995, Open-File Report 95-195
Three species of sportfish--walleye, smallmouth bass, and rainbow trout--were collected from Franklin D. Roosevelt Lake and the upstream reach of the Columbia River within the state of Washington, to determine the concentrations of mercury and other selected trace elements in fish tissue. Concentrations of total mercury in walleye fillets ranged...
Use of a reactive gas transport model to determine rates of hydrocarbon biodegradation in unsaturated porous media
Arthur L. Baehr, Ronald J. Baker
1995, Water Resources Research (31) 2877-2882
A mathematical model is presented that simulates the transport and reaction of any number of gaseous phase constituents (e.g. CO2, O2, N2, and hydrocarbons) in unsaturated porous media. The model was developed as part of a method to determine rates of hydrocarbon biodegradation associated with natural cleansing at petroleum product...
Evaluation of lipid-containing semipermeable membrane devices for monitoring organochlorine contaminants in the Upper Mississippi river
Geoffrey S. Ellis, Colleen E. Rostad, James N. Huckins, Christopher J. Schmitt, Patrick MacCarthy
1995, Environmental Toxicology and Chemistry (14) 1875-1884
Organochlorine contaminants sequestered in lipid-containing semipermeable membrane devices (SPMDs) were compared to those found in tangential-flow ultrafilter permeates as part of a pilot study at 10 sites in the Upper Mississippi River system. Caged and feral fish from three primary sites were also analyzed for comparison. Concentrated organochlorine (OC) compounds...
Radiocarbon evidence for extensive plate-boundary rupture about 300 years ago at the Cascadia subduction zone
A.R. Nelson, B.F. Atwater, P.T. Bobrowsky, L. A. Bradley, J. J. Clague, G. A. Carver, M.E. Darienzo, W.C. Grant, H.W. Krueger, R. Sparks, Thomas W. Stafford Jr., M. Stuiver
1995, Nature (378) 371-374
The Cascadia subduction zone, a region of converging tectonic plates along the Pacific coast of North America, has a geological history of very large plate-boundary earthquakes1,2, but no such earthquakes have struck this region since Euro-American settlement about 150 years ago. Geophysical estimates of the moment magnitudes (Mw) of the...
Summary of suspended-solids concentration data, Central and South San Francisco Bays, California, water years 1992 and 1993
Paul A. Buchanan, David H. Schoellhamer
1995, Open-File Report 94-543
Hydrogeology of post-Wilcox Group stratigraphic units in the area of the Naval Air Station Memphis, near Millington, Tennessee
James A. Kingsbury, J. K. Carmichael
1995, Water-Resources Investigations Report 95-4011
No abstract available. ...
Multiple-regression equations to estimate peak-flow frequency for streams in Hays County, Texas
Raymond M. Slade Jr., Gary D. Tasker, William H. Asquith
1995, Water-Resources Investigations Report 95-4019
No abstract available....
Estimated natural ground-water recharge, discharge, and budget for the Dixie Valley area, west-central Nevada
J. R. Harrill, L.B. Hines
1995, Water-Resources Investigations Report 95-4052
The Dixie Valley area includes seven valleys in west-central Nevada (Dixie, Fairview, Stingaree, Cowkick, Eastgate, Pleasant, and Jersey Valleys; total, 2,380 square miles). Dixie Valley receives surface-water and ground-water flow from Stingaree, Cowkick, Eastgate, Pleasant, and Jersey Valleys and subsurface flow from Fairview Valley, which is a topographically closed basin....
Theoretical models of heterogeneous media for electrical prospecting methods with direct currents
Sabba S. Stefanescu (translator), Adel A. R. Zohdy
1995, Open-File Report 95-544
Hydrologic data from the lower Cedar River Basin, Iowa, 1989-91
P.M. Schulmeyer, K.K. Barnes, P. J. Squillace
1995, Open-File Report 94-711-W
Hydrologic data were collected from May 1989 through July 1991 from the Cedar River and the adjacent alluvial aquifer. The data were collected during various flow regimes of the river to evaluate the movement of agricultural chemicals between surface water and ground water. Water-quality samples from 34 surface-water sites and...
Digital release of stream-sediment, heavy-mineral-concentrate, soil, and other geochemical data collected in the Nabesna 1 degree x 3 degrees Quadrangle, Alaska
S.L. George
1995, Open-File Report 95-625
Digital release of stream-sediment, heavy-mineral-concentrate, and other geochemical data collected in the McCarthy 1 degree x 3 degrees Quadrangle, Alaska
S.L. George
1995, Open-File Report 95-623
Overview of environmental and hydrogeologic conditions at Unalakleet, Alaska
Joseph M. Dorava
1995, Open-File Report 95-347
Trihalomethane and nonpurgeable total organic-halide formation potentials for the Mississippi River and some of its tributaries, March-April 1992
R. E. Rathbun
1995, Open-File Report 94-336
