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This report contains data on ground-water levels and preliminary maps of the potentiometric surface beneath Yucca Mountain and adjacent areas, Nye County, Nevada. The information was obtained in cooperation with the U.S. Department of Energy to help evaluate the suitability of the area for storing high-level nuclear waste. The water-level surface shown on the maps generally represents water-table (unconfined) conditions. The water table in the Yucca Mountain area occurs in ash-flow and air-fall tuffs of Tertiary age. West of the crest of Yucca Mountain, water-level altitudes are about 775 meters above sea level. Along the eastern edge and southern end of Yucca Mountain, the potentiometric surface generally is nearly flat, is about 728 to 730 meters above sea level, and has a southeastward slope. INTRODUCTION This report contains a table of water-level data from wells and test holes in the Yucca Mountain area, Nye County, Nevada, and two preliminary potentiometric-surface maps based on the water-level data. The information was obtained as part of the Nevada Nuclear Waste Storage Investigations being made in part by the U.S. Geological Survey in cooperation with the U.S. Department of Energy under Interagency Agreement DE-AI08-78ET44802. The purpose of the investigations is to evaluate the suitability of the area for storing high-level nuclear wastes in a mined underground repository. GEOHYDROLOGIC SETTING The Yucca Mountain area (fig. 1) is within a large silicic volcanic field of southwestern Nevada. The area is underlain principally by a series of Tertiary ash-flow and bedded tuffs and lavas that range in age from about 11 to 15 million years (Carr and others, 1984). Sources of these volcanic rocks are caldera complexes north of Yucca Mountain. The volcanic plateau is gently tilted eastward at 6° to 13° and is broken into structural blocks. Faults are generally north-striking basin-and-range types and northwest-striking strike-slip types.

Ground-water level data and preliminary potentiometric-surface maps, Yucca Mountain and vicinity, Nye County, Nevada