Hydrogeologic monitoring at the Faultless site, Nye County, Nevada

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Authors:Thordarson, William
Author Affiliations:Primary:
U. S. Geol. Surv., United States
Source:Open-File Report - U. S. Geological Survey, No.OF84-0580, 37p. Publisher: U. S. Geological Survey, Reston, VA, United States. ISSN: 0196-1497
Publication Date:1985
Note:In English. 15 refs.
Summary:The Faultless event was the detonation of an intermediate-yield nuclear device on January 19, 1968, at a depth of 975 meters below the surface of Hot Creek Valley, Nevada. Hydrogeology and radiochemical monitoring, primarily for the reentry hole UC-1-P-2SR. The surface location of reentry hole UC-1-P-2SR is 91 meters north of the emplacement hole UC-1. The reentry hole UC-1-P-2SR was drilled to a total depth of 1,097 meters. The hole penetrated valley-fill sediments above the rubble chimney, as well as valley-fill and Tertiary tuffaceous sediments within the rubble chimney and rubble-filled cavity. Monitoring of the water level in the reentry hole indicated that, from 1970 to 1974, the water level was approximately 694.9 meters in depth below land surface. From 1974 to the present (1983), the water level rose slowly to a depth of 335.1 meters below land surface as the rubble chimney became filled with water. Ground water sampled from reentry hole UC-1-P-2SR is a predominantly sodium bicarbonate type containing some sulfate and minor chloride. Tritium concentrations fluctuated from a maximum value of 9.2 × 108 picocuries per liter in 1976, decreasing to 105 picocuries per liter in 1977, followed by a gradual increase to values of 107 picocuries per liter from 1980 to 1982. After 1971, gross-beta concentration ranged between 1.2 and 130 picocuries per liter, but generally was less than 10 picocuries per liter. Gross-alpha concentration generally was less than 10 micrograms per liter from 1975 to 1982. Modified author abstract.
Subjects:Boreholes; Engineering geology; Explosions; Geochemistry; Ground water; Hydrochemistry; Isotopes; Levels; Monitoring; Nuclear explosions; Pollution; Radioactive isotopes; Radioactivity; Surveys; Transport; USGS; Water quality; Well-logging; Nevada; Nye County Nevada; United States; Central Nevada; Faultless event; Hot Creek Valley; Underground explosions
Coordinates:N383000 N384000 W1161000 W1161500
Record ID:1985073415
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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