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Value of Information Analysis Project Gnome Site, New Mexico

Description: The Project Gnome site in southeastern New Mexico was the location of an underground nuclear detonation in 1961 and a hydrologic tracer test using radionuclides in 1963. The tracer test is recognized as having greater radionuclide migration potential than the nuclear test because the tracer test radionuclides (tritium, 90Sr, 131I, and 137Cs) are in direct contact with the Culebra Dolomite aquifer, whereas the nuclear test is within a bedded salt formation. The tracer test is the topic here. Rec… more
Date: January 1, 2010
Creator: Pohll, Greg & Chapman, Jenny
Partner: UNT Libraries Government Documents Department
open access

Letter Report: Contaminant Boundary at the Shoal Underground Nuclear Test

Description: As part of the corrective action strategy reached between the U.S. Department of Energy and the State of Nevada, the extent and potential impact of radionuclide contamination of groundwater at underground nuclear test locations must be addressed. This report provides the contaminant boundary for the Project Shoal Site, based on the groundwater flow and transport model for the site, by Pohlmann et al.
Date: August 6, 2004
Creator: Pohll, Greg & Pohlmann, Karl
Partner: UNT Libraries Government Documents Department
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Use of Numerical Groundwater Modeling to Evaluate Uncertainty in Conceptual Models of Recharge and Hydrostratigraphy

Description: Numerical groundwater models are based on conceptualizations of hydrogeologic systems that are by necessity developed from limited information and therefore are simplifications of real conditions. Each aspect (e.g. recharge, hydrostratigraphy, boundary conditions) of the groundwater model is often based on a single conceptual model that is considered to be the best representation given the available data. However, the very nature of their construction means that each conceptual model is inheren… more
Date: January 19, 2007
Creator: Pohlmann, Karl; Ye, Ming; Pohll, Greg & Chapman, Jenny
Partner: UNT Libraries Government Documents Department
open access

Data Decision Analysis: Project Shoal

Description: The purpose of this study was to determine the most appropriate field activities in terms of reducing the uncertainty in the groundwater flow and transport model at the Project Shoal area. The data decision analysis relied on well-known tools of statistics and uncertainty analysis. This procedure identified nine parameters that were deemed uncertain. These included effective porosity, hydraulic head, surface recharge, hydraulic conductivity, fracture correlation scale, fracture orientation, dip… more
Date: January 1, 1999
Creator: Forsgren, Frank; Pohll, Greg & Tracy, John
Partner: UNT Libraries Government Documents Department
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Development and Testing of a Groundwater Management Model for the Faultless Underground Nuclear Test, Central Nevada Test Area

Description: This document describes the development and application of a user-friendly and efficient groundwater management model of the Central Nevada Test Area (CNTA) and surrounding areas that will allow the U.S. Department of Energy and state personnel to evaluate the impact of future proposed scenarios. The management model consists of a simple hydrologic model within an interactive groundwater management framework. This framework is based on an object user interface that was developed by the U.S. Geo… more
Date: January 25, 2006
Creator: Boyle, Douglas P.; Lamorey, Gregg; Bassett, Scott; Pohll, Greg & Chapman, Jenny
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Potential Hydrocarbon Transport at the UC-4 Emplacement Hole, Central Nevada Test Area

Description: Emplacement hole UC-4 was drilled in 1969 at the Central Nevada Test Area and left filled with drilling mud. Surface characterization samples collected from abandoned mud pits in the area yielded elevated concentrations of total petroleum hydrocarbon, thereby raising a concern that the mud-filled emplacement hole may be leaching hydrocarbons into alluvial aquifers. This study was initiated to address this concern. An analytical solution for flow near a wellbore was used to calculate the amount … more
Date: September 30, 1998
Creator: Lyles, Brad F.; Papelis, Charalambos; Pohll, Greg & Sloop, Derek
Partner: UNT Libraries Government Documents Department
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Assessing Groundwater Model Uncertainty for the Central Nevada Test Area

Description: The purpose of this study is to quantify the flow and transport model uncertainty for the Central Nevada Test Area (CNTA). Six parameters were identified as uncertain, including the specified head boundary conditions used in the flow model, the spatial distribution of the underlying welded tuff unit, effective porosity, sorption coefficients, matrix diffusion coefficient, and the geochemical release function which describes nuclear glass dissolution. The parameter uncertainty was described by a… more
Date: June 14, 2002
Creator: Pohll, Greg; Pohlmann, Karl; Hassan, Ahmed; Chapman, Jenny & Mihevc, Todd
Partner: UNT Libraries Government Documents Department
open access

Contaminant Boundary at the Faultless Underground Nuclear Test

Description: The U.S. Department of Energy (DOE) and the Nevada Division of Environmental Protection (NDEP) have reached agreement on a corrective action strategy applicable to address the extent and potential impact of radionuclide contamination of groundwater at underground nuclear test locations. This strategy is described in detail in the Federal Facility Agreement and Consent Order (FFACO, 2000). As part of the corrective action strategy, the nuclear detonations that occurred underground were identifie… more
Date: April 1, 2003
Creator: Pohll, Greg; Pohlmann, Karl; Daniels, Jeff; Hassan, Ahmed & Chapman, Jenny
Partner: UNT Libraries Government Documents Department
open access

Remediation of the Faultless underground nuclear test: Moving forward in the face of model uncertainty.

Description: The hundreds of locations where nuclear tests were conducted underground are dramatic legacies of the cold war. The vast majority of these tests are within the borders of the Nevada Test Site (NTS), but 11 underground tests were conducted elsewhere. The Faultless test, conducted in central Nevada, is the site of an ongoing environmental remediation effort that has successfully progressed through numerous technical challenges due to close cooperation between the U.S. Department of Energy (DOE) N… more
Date: October 18, 2001
Creator: Chapman, Jenny B.; Pohlmann, Karl; Pohll, Greg; Hassan, Ahmed; Sanders, Peter; Sanchez, Monica et al.
Partner: UNT Libraries Government Documents Department
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