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This report contains the results of hydraulic testing and monitoring, geophysical logging, and water analysis of test well USW H-5, one of a group of test wells drilled in the vicinity of Yucca Mountain, Nye County, Nevada, on behalf of the U.S. Department of Energy to investigate the suitability of the area to store and isolate high-level radioactive waste. The test well was drilled to a depth of 1,219 meters; all rocks penetrated are of volcanic origin and of Tertiary age. Depth to water in the test well was 704 meters; the hydraulic head had no measurable variation with depth below land surface; altitude of the water surface was about 774 meters above sea level. Production during hydraulic testing of the test well was about 10 liters per second. The Bullfrog Member of the Crater Flat Tuff, which ranged in depth from 690 to 836 meters, has the most permeable zone penetrated by the test well; this zone yielded about 90 percent of the water during pumping. The Tram Member of the Crater Flat Tuff, ranging in depth from 836 to 1,040 meters, and an unnamed dacitic (?) lava, from 1,043 meters to total depth, yielded minor quantities of water. Drawdown response to pumping was consistent with two alternative conceptual models. Use of a model for an unconfined, anisotropic aquifer indicated transmissivity is about 35 meters squared per day. Use of a finite-conductivity, vertical-fracture model indicated that fracture conductivity may be large and nonradial flow responses need to be considered. Chemical character of water from the test well was typical of that from tuffaceous rocks in southern Nevada; dissolved solids were about 200 milligrams per liter. Carbon-14 activity of the water was 21.4 percent of modern, yielding an apparent age of 12,400 years before present. Manuscript approved for publication September 14, 1988 INTRODUCTION The U.S. Geological Survey has been condu Mountain, Nevada, to determine the hydrologic site for storage of high-level nuclear waste i tory. These investigations are part of the Yu the Nevada Nuclear Waste Storage Investigation ducted in cooperation with the U.S. Department Office, under Interagency Agreement DE-AI08-78] a principal method of investigation. This repi hydraulic testing of test well USW H-5. Test well USW H-5 is in Nye County, Nev., Vegas in the southern part of the State (fig. 233,661 m and E. 170,358 m in the Nevada State (lat 36°51'22 tf N.; long 116°27 I 55" E.), is on forming Yucca Mountain. Altitude of the Tand 1,478.5 m above sea level. ting investigations at Yucca nd geologic suitability of the , an underground mined reposica Mountain Project, formerly project, and are being conof Energy, Nevada Operations T44802. Test drilling has been rt presents the results of about 140 km northwest of Las ). The site, located at N. Coordinate System Central Zone op of the principal ridge ;urface at the well site is Data from the drilling, testing, and monitoring of the test well were included in a report by Bentley and others (19J here, were analyzed and interpreted in this in\ 3). The data, repeated in part 'estigation. The test well was nd lava of Tertiary age. drilled to a total depth of 1,219 m into tuff Hydraulic tests were conducted after the test veil had been drilled to total depth, cased to a depth of 790 m, and perforated below 704 m; depth to water was about 704 m. Drilling of the test well began on May 19, 1982; total depth of 1,219 m was reached on June 23, 1982, and testing was completed by August 1, 1982. The rotary-drilling fluid was air foam, consisting of air, detergent, and water. Well construction is shown in figure 2. Maximum borehole deviation from vertical was l°45 f ; this deviation and the figure 3 were derived from a gyroscopic survey. be subtracted to obtain true depths from measured depths; this factor ranges from 0.08 m near the water table to 0.14 m near test well at total depth is about 13 m southwest of the surface location. A summary of operations and borehole report by Fenix & Scisson, Inc., 1 Mercury, Nev. Department of Energy), September 3, 1982, is horizontal drift shown in A correction factor needs to total depth of the well. The conditions, part of an administrative (consultant to the U.S. here: presented 762 mm (30") casing was set at 11.6 m (33') in a 914 mm (36") hole drilled to 11.6 m (38') with conventional circulation using water. The annul us was cemented to surface iii 3 stages with 5.61 m3 (198 ft3 ) of cement slurry. Calculated annular volume was 2.35 m3 (83 ft3 ). 508 mm (20") hole was drilled to 94.8 m (311') using air foam. Caliper, induction and formation density logs were run 05-25-82. The average curve on the caliper log indicated hole erosion from 14.3 m (47') to 63.4 m (208') 1Use of firm or trade names in this report only and does not constitute endorsement by the with maximum hole is for identification purposes U.S. Geological Survey. 36*45' A / ^-UE-25b#1 :* /NEVADA USWH-4 TEST Amargosa Valley (Lathrop Wells) Base from U.S. Geological Survey 1:250000, Death Valley. California and Nevada, 1970 10 15 KILOMETERS

Geohydrology of rocks penetrated by test well USW H-5, Yucca Mountain, Nye County, Nevada