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A total of 15 water-supply wells are currently being used at the Nevada Test Site (NTS). The purpose of this report is to bring together the information gleaned from investigations of these water-supply wells. This report should serve as a reference on well construction and completion, static water levels, lithologic and hydrologic characteristics of aquifers penetrated, and general water quality of water-supply wells at the NTS. Possible sources for contamination of the water-supply wells are also evaluated. Existing wells and underground nuclear tests conducted near (within 25 meters (m)) or below the water table within 2 kilometers (km) of a water-supply were located and their hydrogeologic relationship to the water-supply well determined.

A complex pattern of active faults occurs in the southern Amargosa Desert, southern Nye, County, Nevada. These faults can be grouped into three main fault systems: (1) a NE-striking zone of faults that forms the southwest extension of the left-lateral Rock Valley fault zone, in the much larger Spotted Range-Mine Mountain structural zone, (2) a N-striking fault zone coinciding with a NNW-trending alignment of springs that is either a northward continuation of a fault along the west side of the Resting Spring Range or a N-striking branch fault of the Pahrump fault system, and (3) a NW-striking fault zone which is parallel to the Pahrump fault system, but is offset approximately 5 km with a left step in southern Ash Meadows. These three fault zones suggest extension is occurring in an E-W direction, which is compatible with the {approximately}N10W structural grain prevalent in the Death Valley extensional region to the west.

In February 1983, the U.S. Department of Energy (DOE) identified the Yucca Mountain site in Nevada as one of nine potentially acceptable sites for a mined geologic repository for spent nuclear fuel and high-level radioactive waste. The site is in the Great Basin, which is one of five distinct geohydrologic settings considered for the first repository. To determine their suitability, the Yucca Mountain site and the eight other potentially acceptable sites have been evaluated in accordance with the DOE's General Guidelines for the Recommendation of Sites for the Nuclear Waste Repositories. These evaluations were reported in draft environmental assessments (EAs), which were issued for public review and comment. After considering the comments received on the draft EAs, the DOE prepared the final EAs. On the basis of the evaluations reported in this EA, the DOE has found that the Yucca Mountain site is not disqualified under the guidelines. The DOE has also found that it is suitable for site characterization because the evidence does not support a conclusion that the site will not be able to meet each of the qualifying conditions specified in the guidelines. On the basis of these findings, the DOE is nominating the Yucca Mountain site …

Two appendixes accompanying the report "National Uranium Resource Evaluation, Winnemucca Quadrangle, Nevada." Appendix A is a table describing the location and other data for 19 uranium occurrences in the quadrangle. Appendix B-2 includes the location and geologic codes for rock samples collected for the report.

Tables showing data such as location, elemental analyses, and peralkaline indices in ppm for rock and water samples collected in the quadrangle for the report "National Uranium Resource Evaluation, Winnemucca Quadrangle, Nevada: Appendix."

Tables listing laboratory and field KUT data, including eTh/eU. Th/U, and eU/cU ratios, for samples collected from the Winnemucca quadrangle.

Reports providing data for 1 uranium occurrences in the Winnemucca Quadrangle, including description, uranium analysis, exact location, deposit type, and features of the host rock.

Tables showing the percentage of mineral components for samples collected int the Winnemucca Quadrangle.

Tables showing the normative indices of quartz, orthoclase, albite, anorthite, nephelene, and leucite for samples collected from the Winnemucca Quadrangle along with the differentiation index for each sample.

This report presents the results of detailed sampling of soils, rocks, and dry lake bed material from the area of Jean Dry Lake in southern Nevada.

Tabular data reporting soil analyses, auger sample analyses, and rock analyses gathered from the area of Jean Dry Lake in southern Nevada (see pages 4 and 5 of report).

A report discussing the results of an investigation indicating environments favorable for hydroallogenic uranium deposits in the Fish Creek Basin sedimentary rocks of Miocene age and for hydroallogenic and sandstone uranium deposits in the Home Station Wash sedimentary rocks of Miocene age.

The following report is the first of two volumes describing the program and results of the airborne gamma and total magnetic field surveys of the Reno quadrangle conducted between October 4-November 10, 1977.

From abstract: This report presents the results of the geochemical reconnaissance sampling in the Winnemucca 10 x 20 quadrangle of the National Topographic Map Series (NTMS). We collected wet and dry sediment samples throughout the 18,770-km2 arid to semi-arid area and water samples at available streams, springs and wells. We present neutron activation analyses of uranium and trace elements and other measurements made in the field and laboratory in tabular hardcopy and microfiche format. The report includes 5 full-size overlays for use with the Winnemucca NTMS 1:250,000 quadrangle. Water sampling sites, water-sample uranium and thorium concentrations, sediment sampling sites, and sediment-sample total uranium and thorium concentrations are shown on the separate overlays. We present general geological and structural descriptions of the area, and describe the 12 known uranium occurrences.

Supplementary data containing information on uranium concentrations in sediment samples to accompany a report on hydrogeochemical and stream sediment reconnaissance in the Winnemucca Quadrangle, Nevada.

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This report summarizes results on surveys taken by the U.S. Geological Survey made to determine the seismic velocity, electrical resistivity, and preliminary geology of rock in the U12n.03 tunnel, Nevada Test Site.

From abstract: Project Dugout was a chemical explosive row charge cratering experiment in hard rock conducted at the AEC Nevada Test Site as part of the Plowshare Program for development of nuclear excavation technology.

Introduction: The chemical character of ground water depends to a large degree upon the character of the rock formations through which the water moves. The composition of the water is the result of several solutional and decompositional processes.

This is a photo-geologic map of the Skull Mountain Quadrangle at the Nevada Test Site.

Geologic map of the Topopah Spring Southwest quadrangle, Nevada with notations for specific topographic features and profile views. Scale 1:24,000.

From introduction: The purpose of this study was to map the geology of the (Sedan) crater shell and relate the information gained to shell configuration and cratering mechanics. Hopefully, the data presented will be of use in planning future nuclear cratering experiments.

Discussing photographs of rocks from Basalt Mesa