Geohydrologic data for test well UE-25p#1, Yucca Mountain area, Nye County, Nevada

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Authors:Craig, R. W.; Johnson, K. A.
Author Affiliations:Primary:
U. S. Geol. Surv., Lakewood, CO, United States
Fenix and Scisson, United States
Source:Open-File Report - U. S. Geological Survey, No.OF84-0450, 70p. Publisher: U. S. Geological Survey, Reston, VA, United States. ISSN: 0196-1497
Publication Date:1984
Note:In English. 9 refs.
Summary:Drilling operations, lithology, availability of borehole geophysical logs, water levels, water chemistry, pumping tests, borehole-flow survey, and packer-injection tests. Part of the Nevada nuclear waste storage investigations to identify suitable sites for underground storage of high-level radioactive wastes. Test well UE-25pwas drilled to a total depth of 1,805 meters. To a depth of 1,244 meters, the rocks are predominantly ashflow tuffs of Tertiary age. From 1,244 to 1,805 meters, the rock is dolomite of Paleozoic age. The composite static water level was approximately 381 meters below land surface for the Tertiary section and 361 meters for the Paleozoic section. Hydrologic tests were performed on the well during two different periods. The Tertiary section was tested after the well was drilled to 1,301 meters, and the Paleozoic section was tested after completion of drilling. A pumping test of the Tertiary section showed a maximum drawdown of about 33.7 meters after pumping for 3,150 minutes at 22 liters per second. Pumping of the Paleozoic section showed an apparent maximum drawdown of 9.3 meters after pumping for 6,080 minutes at 31.5 liters per second. During the first 50 minutes of the pumping test, the discharge temperature increased from about 30° to 56° Celsius. A borehole-flow survey showed that, for the Tertiary section of the hole, about 58 percent of the water withdrawn from the well came from the depth interval from 469 to 501 meters. For the Paleozoic section, 75 percent of the water withdrawn from the well came from the depth intervals from 1,340 to 1,362 meters and from 1,515 to 1,551 meters.—Modified author abstract.
Subjects:Carbonate rocks; Cenozoic; Dolostone; Drawdown; Engineering geology; Ground water; Igneous rocks; Levels; Paleozoic; Pump tests; Pyroclastics; Radioactive waste; Sedimentary rocks; Site exploration; Surveys; Temperature; Tertiary; Tuff; USGS; Volcanic rocks; Waste disposal; Well-logging; Nevada; Nevada Test Site; Nye County Nevada; United States; Yucca Mountain
Coordinates:N364800 N365500 W1162000 W1163000
Record ID:1985009924
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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