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Data collected to determine the hydraulic characteristics of rocks penetrated by test holes UE-25 UZ #4 and UE-25 UZ #5 are presented. These test holes are part of a series of test holes drilled in and near the southwestern part of the Nevada Test Site in an investigation conducted by the U.S. Geological Survey in cooperation with the U.S. Department of Energy. This investigation is part of the Yucca Mountain Project Branch, Hydrologic Investigations Program (formerly Nevada Nuclear Waste Storage Investigations) to determine the suitability of this site for storage of high-level radioactive wastes in an underground mined repository. Data on drilling operations, lithology, coring, and laboratory analyses of hydrologic characteristics of core and cuttings samples are included in this report. The density, water content, and water potential of the samples collected from UE-25 UZ #4 and UE-25 UZ #5 are related to the degree of welding of the rock units. Water content, and water potential decrease with an increase in the degree of welding; density increases with the degree of welding. The partially welded, nonwelded, and bedded tuffs penetrated by UE-25 UZ #4 and UE-25 UZ #5 comprise a thicker section than the combined moderately welded and densely welded tuffs. The bulk density of core samples of nonwelded and bedded tuffs ranged from 0.97 to 1.54 and averaged 1.26 grams per cubic centimeter for UE-25 UZ #4 and ranged from 0.95 to 1.74 and averaged 1.25 grams per cubic centimeter for UE-25 UZ #5; grain density ranged from 2.30 to 2.61 and averaged 2.41 grams per cubic centimeter for UE-25 UZ #4 and ranged from 2.32 to 2.62 and averaged 2.40 grams per cubic centimeter for UE-25 UZ #5. Gravimetric water contents of partially welded, nonwelded, and bedded tuffs from cores from UE-25 UZ #4 and UE-25 UZ #5 averaged 0.168 and 0.146 grams per gram, respectively, and water potentials averaged 350 and 320 negative kilopascals, respectively. For UE-25 UZ #4, tritium concentrations of alluvialcolluvial drive core were higher than background levels (5-10 units) from 0.91 to 4.88 meters below ground surface.

Geohydrologic data from test holes UE-25 UZ #4 and UE-25 UZ #5, Yucca Mountain, Nye County, Nevada