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Page 4241, results 106001 - 106025

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Simulation of flow in the Edwards Aquifer, San Antonio region, Texas, and refinement of storage and flow concepts
Robert W. Maclay, Larry F. Land
1988, Water Supply Paper 2336-A
The Edwards aquifer is a complexly faulted, carbonate aquifer lying within the Balcones fault zone of south-central Texas. The aquifer consists of thin- to massive-bedded limestone and dolomite, most of which is in the form of mudstones and wackestones. Well-developed secondary porosity has formed in association with former erosional surfaces...
Maps showing anomalous concentrations of zinc, silver, antimony, manganese, barium and strontium in stream sediment and heavy-mineral concentrate from parts of the Ajo and Lukeville 1 degree by 2 degrees quadrangles, Arizona
P. K. Theobald, H. N. Barton
1988, Miscellaneous Field Studies Map 1834-E
This map is part of a folio of maps of the Ajo and Lukeville 1 degree x 2 degrees quadrangles, Arizona, prepared under the Conterminous United States Mineral Assessment Program. Other publications in this folio include U.S. Geological Survey Open-File Reports 82-419 (Barton and others, 1982), 82-599 (Klein, 1982), and...
Preliminary evaluation of ground-water flow in Bear Creek Valley, the Oak Ridge Reservation, Tennessee
Z. C. Bailey
1988, Water-Resources Investigations Report 88-4010
Bear Creek Valley, Tennessee contains hazardous waste disposal sites where contaminants leach into ground and surface water. Groundwater flow and the potential migration of contaminants is poorly understood. The Valley is underlain by calcareous shale that contains limestone units. Ridges to the north and south are underlain by interbedded sandstones,...
Well construction, lithology, and geophysical logs for boreholes in Bear Creek Valley near Oak Ridge, Tennessee
Z. C. Bailey, D. W. Hanchar
1988, Water-Resources Investigations Report 88-4068
Twenty-four wells were constructed at nine sites at Bear Creek Valley to provide geologic and hydrologic information. Lithologic samples and suits of geophysical logs were obtained from the deepest boreholes at six of the sites. Two of these boreholes at the base of Chestnut Ridge were completed in the Maynardville...
Maps showing anomalous concentrations of lead, molybdenum, bismuth, and tungsten in stream sediment and heavy-mineral concentrate from parts of the Ajo and Lukeville 1 degree by 2 degrees quadrangles, Arizona
P. K. Theobald, H. N. Barton
1988, Miscellaneous Field Studies Map 1834-D
These maps are part of a folio of maps of the Ajo and Lukeville 1° x 2° quadrangles, Arizona, prepared under the Conterminous United States Mineral Assessment Program. Other publications in this folio include U.S. Geological Survey Miscellaneous Field Studies Maps MF-1834-A, 1834–B, and 1834–C and U.S. Geological Survey Open-File...
A computer program incorporating Pitzer's equations for calculation of geochemical reactions in brines
Niel Plummer, D.L. Parkhurst, G.W. Fleming, S.A. Dunkle
1988, Water-Resources Investigations Report 88-4153
The program named PHRQPITZ is a computer code capable of making geochemical calculations in brines and other electrolyte solutions to high concentrations using the Pitzer virial-coefficient approach for activity-coefficient corrections. Reaction-modeling capabilities include calculation of (1) aqueous speciation and mineral-saturation index, (2) mineral solubility, (3) mixing and titration of aqueous...
Estimating soil matric potential in Owens Valley, California
Stephen K. Sorenson, R.F. Miller, M.R. Welch, D.P. Groeneveld, F.A. Branson
1988, Open-File Report 88-79
Much of the floor of the Owens Valley, California, is covered with alkaline scrub and alkaline meadow plant communities, whose existence is dependent partly on precipitation and partly on water infiltrated into the rooting zone from the shallow water table. The extent to which these plant communities are capable of...
Structure and stratigraphy of the western Florida shelf; Part I, Multichannel reflection seismic data
M. M. Ball, R. G. Martin, R. Q. Foote, A.V. Applegate
1988, Open-File Report 88-439
This paper presents a synthesis of multichannel seismic data on the Western Florida shelf (Fig. 1). This work is part of an ongoing regional program conducted by the U.S. Geological Survey in studying the Exclusive Economic Zones of the United States.The data include 1270 km of 32-fold, common-depth-point (CDP), reflection...
Use and availability of continuous streamflow records in Tennessee
J.F. Lowery
1988, Open-File Report 86-322
This report documents the results of the data uses and funding part of a study of the cost-effectiveness of the streamflow information program in Tennessee. Presently, 88 continuous surface water gaging stations are operated in Tennessee on a budget of $490,800. Data uses and funding sources are identified for each...
Specific conductance; theoretical considerations and application to analytical quality control
Ronald L. Miller, Wesley L. Bradford, Norman E. Peters
1988, Water Supply Paper 2311
This report considers several theoretical aspects and practical applications of specific conductance to the study of natural waters. A review of accepted measurements of conductivity of secondary standard 0.01 N KCl solution suggests that a widely used algorithm for predicting the temperature variation in conductivity is in error. A new...