USGS Science⌕ Search

Geology topics

R. W. Craig

Publications and source records attributed to R. W. Craig.

6 recordsLinked to original sources
USGS1984

Geohydrologic data for test well UE-25p1, Yucca Mountain area, Nye County, Nevada

This report presents the following data for test well UE-25p 1 in Nye County, Nevada: drilling operations, lithology, availability of borehole geophysical logs, water levels, future availability of core analyses, water chemistry, pumping tests, borehole-flow surveys, and packer-injection tests. The well is one of a series of test wells drilled in and near Yucca Mountain adjacent to the Nevada Test Site in cooperation with the U.S. Department of Energy. These investigations are part of the Nevada Nuclear Waste Storage Investigations to identify suitable sites for underground storage of high-level radioactive wastes. Test well UE-25p 1 was the first in the Yucca Mountain area to penetrate rocks of Paleozoic age. To a depth of 1,244 meters, the rocks are predominantly ash-flow tuffs of Tertiary age. From 1,244 meters to a total depth of 1,805 meters, the rock is dolomite of Paleozoic age. (USGS)

Open-File Report↗
USGS1984

Geohydrology of rocks penetrated by test well UE-25p#1, Yucca Mountain area, Nye County, Nevada

Test well UE-25pNo1 was drilled in cooperation with the U.S. Department of Energy in the southwestern part of the Nevada Test Site, for investigations related to the isolation of high-level nuclear wastes. Rocks penetrated in the well are predominantly ash-flow tuffs of Tertiary age to a depth of 1,244 meters and dolomite of Paleozoic age to a total depth of 1,805 meters. Hydraulic head is 20 meters higher in the Paleozoic dolomite than in most of the Tertiary tuffs; this hydraulic-head difference indicates a major hydrologic barrier to the downward movement of fluid. Any vertical fluid movement from the Tertiary to the Paleozoic sections would be small, as would be movement from the Paleozoic rocks into the Tertiary rocks. In the Tertiary section, an interval of less than 30 meters in the upper Prow Pass Member of Crater Flat Tuff has an apparent transmissivity of 14 meters squared per day. In the Paleozoic section, an interval of less than 22 meters has an apparent transmissivity of 69 meters squared per day. Compositions of water from the Tertiary and Paleozoic sections are similar to regional waters from rocks of the same ages. (USGS)

Water-Resources Investigations Report↗
USGS1983

Geohydrologic data for test well USW H-6 Yucca Mountain area, Nye County, Nevada

The following data are presented for test well USW H-6: drilling operations, lithology, availability of borehole geophysical logs , water levels, future availability of core analyses, water chemistry, pumping tests, and packer-injection tests. The well is one of a series of test wells drilled in and near Yucca Mountain adjacent to the Nevada Test Site, Nye County, Nevada, in cooperation with the U.S. Department of Energy. These investigations are part of the Nevada Nuclear Waste Storage Investigations to identify suitable sites for underground storage of high-level radioactive wastes. Test well USW H-6 was drilled to a total depth of 1,220 m. Rocks penetrated are predominantly ash-flow tuffs. Lava was encountered from 877 to 1 ,126 m. The composite static water level is approximately 526 m below land surface. The well was pumped during two periods. Maximum drawdown was about 18 m after pumping for 4,822 min at 28 L/sec, and 12 m after pumping for 2,226 min at 27 L/sec. A borehole flow survey showed that 91% of the water withdrawn from the well came from the depth intervals from 616 to 631 m, and from 777 to 788 m. (Author 's abstract)

Open-File Report↗
USGS1983

Hydrology of the Newberry Volcano caldera, Oregon

Precipitation in the Newberry Caldera is very nearly in balance with evaporation, evapotranspiration, and streamflow. Calcium, magnesium, and bicarbonate ions predominate in the more dilute ground and surface water. Thermal waters from springs and wells have concentrations of 900 milligrams per liter or more and are characterized by high concentrations of sodium and sulfate. Attempts to account for the origin of the hot springs on the basis of mixing relations and isotopic analyses were inconclusive; the springs may represent mixtures of thermal and nonthermal water which are altered by gases rising from sources beneath the caldera floor. Annual recharge to deep aquifers beneath the caldera is probably in the range 2,500 to 6,500 acre-feet. Observations in a Geological Survey drill hole suggest that part of the water may flow to aquifers at depths as much as 1,900 feet beneath the caldera floor. Potential recharge to a postulated geothermal reservoir probably is extremely small. (USGS)

Water-Resources Investigations Report↗