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68935 results.

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Page 1814, results 45326 - 45350

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Computerized stratified random site-selection approaches for design of a ground-water-quality sampling network
J. C. Scott
1990, Water-Resources Investigations Report 90-4101
Computer software was written to randomly select sites for a ground-water-quality sampling network. The software uses digital cartographic techniques and subroutines from a proprietary geographic information system. The report presents the approaches, computer software, and sample applications. It is often desirable to collect ground-water-quality samples from various areas in a study...
Hydrogeologic, water-level, and water-quality data from monitoring wells at the U.S. Marine Corps Air Station, Cherry Point, North Carolina
L. C. Murray Jr., K. M. Keoughan
1990, Water-Resources Investigations Report 89-4200
Unlined hazardous-waste disposal sites at the U.S. Marine Corps Air Station, Cherry Point, North Carolina, are located near drinking-water supply wells that tap the Castle Hayne aquifer. Hydrogeologic and water-quality data were collected near 2 of these sites from 12 monitoring wells installed in May through June 1987. Near the northernmost...
Hydrogeology and ground-water-quality conditions at the Emporia- Lyon County Landfill, eastern Kansas, 1988
N. C. Myers, P. R. Bigsby
1990, Water-Resources Investigations Report 90-4043
Hydrogeology and water-quality conditions at the Emporia-Lyon County Landfill, eastern Kansas, were investigated from April 1988 through April 1989. Potentiometric-surface maps indicated groundwater movement from the northeast and northwest towards the landfill and then south through the landfill to the Cottonwood River. The maps indicate that during periods of low...
Effects of present and projected ground-water withdrawals on the Twin Cities aquifer system, Minnesota
Michael Schoenberg
1990, Water-Resources Investigations Report 90-4001
The Twin Cities aquifer system in Minnesota contains 5 aquifers and 4 confining units composed of 14 stratigraphic units. Bedrock aquifers consist of friable sandstones and highly fractured carbonate rocks; aquifers in the glacial drift consist of outwash and alluvium. From 1880 to 1980, groundwater withdrawals had caused long-term declines...
Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the Salton Sea area, California, 1986-87
J. G. Setmire, J.C. Wolfe, R. K. Stroud
1990, Water-Resources Investigations Report 89-4102
Water, bottom sediment, and biota were sampled during 1986 and 1987 in the Salton Sea area to determine concentrations of trace elements and pesticides as part of the Department of Interior Irrigation Drainage Program. The sampling sites (12 water, 15 bottom sediment, and 5 biota) were located in the Coachella...
Geochemistry of batch-extract waters derived from spoil material collected at the Cordero coal mine, Powder River basin, Wyoming
D. L. Naftz
1990, Water-Resources Investigations Report 87-4200
Batch-mixing experiments to evaluate postmining water quality at the Cordero Mine were conducted by the U.S. Geological Survey during 1984 to 1985. Contact of groundwater from the spoil aquifer with fresh spoil material caused only small changes in major-element concentrations and in pH, unless sulfide oxidation or contact with soluble...
A water-resources data-network evaluation for Monterey County, California, phase 3: Northern Salinas River drainage basin
W. E. Templin, R. C. Schluter
1990, Water-Resources Investigations Report 89-4123
This report evaluates existing data collection networks and possible additional data collection to monitor quantity and quality of precipitation, surface water, and groundwater in the northern Salinas River drainage basin, California. Of the 34 precipitation stations identified, 20 were active and are concentrated in the northwestern part of the study...
Effects of impoundments on water quality of streams in the Coteau des Prairies: Upper Minnesota River basin
C.J. Smith, G. A. Payne, L. H. Tornes
1990, Water-Resources Investigations Report 90-4033
Water-quality and streamflow data were collected in the Coteau des Prairies region of southwestern Minnesota and eastern South Dakota to document the water-quality characteristics of streams and impoundments in the Coteau, and to predict the effect of proposed impoundments on the quality of water in Coteau streams. Reconnaissance data collection at...
Flood of December 1987 in central and eastern Arkansas
B.L. Neely Jr.
1990, Water-Resources Investigations Report 89-4188
Heavy rain fell across Arkansas during December 24-28, 1987. During this period, 6 to 12 inches of rain fell in a 100-mile wide belt extending roughly from Texarkana to West Memphis, Arkansas. The intense rainfall produced flooding throughout much of central and eastern Arkansas. Peak discharges associated with the flood...
Geohydrology, water quality, and water budgets of Golden Gate Park and the Lake Merced area in the western part of San Francisco, California
E.B. Yates, S. N. Hamlin, L.H. McCann
1990, Water-Resources Investigations Report 90-4080
The groundwater resources in the western part of the San Francisco, groundwater budgets for Golden Gate Park and the Lake Merced area, and a surface-water budget for Lake Merced are described. A continuous groundwater basin underlies a 39-sq-mi coastal strip in the San Francisco Peninsula south of the city. Basin...
Streamflow characteristics of small tributaries of Rock Creek, Milk River basin, Montana, base period water years 1983-87
Charles Parrett, J. A. Hull
1990, Water-Resources Investigations Report 89-4206
Five streamflow-gaging stations were installed in the Rock Creek basin north of the Milk River near Hinsdale, Montana. Streamflow was monitored at these stations and at an existing gaging station upstream on Rock Creek from May 1983 through September 1987. The data collected were used to describe the flow characteristics...