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Water-Resources Setting, Martin County, Florida

Description: From introduction: This report describes some basic principles of hydrology as they apply to Martin County. The major land features of the county are described first, then the hydrologic cycle and the county's surface-water and ground-water resource. Specific problems associated with population growth and the county's development, such as saltwater intrusion and water use, are sited and sections have been included in the report to deal with these problems.
Date: February 1978
Creator: Miller, R. Adam
Partner: UNT Libraries Government Documents Department

Water Table in Rocks of Cenozoic and Paleozoic Age, 1980, Yucca Flat, Nevada Test Site, Nevada

Description: Base from U.S. Geological Survey; Oak Spring, Plutonium Valley, Tippipah Spring, and Yucca Flat 1:24,000, 1960; Jangle Ridge, Mine Mountain, Paiute Ridge, Rainier Mesa, and Yucca Lake 1:24,000, 1961; 20,000 foot grid based on Nevada coordinate system, central zone
Date: 1983
Creator: Doty, G. C. & Thordarson, William
Partner: UNT Libraries Government Documents Department

Water Use in Wisconsin, 1979

Description: From abstract: This report summarizes the uses of water in Wisconsin for 1979, except aesthetics, navigation, and recreational use.
Date: July 1982
Creator: Lawrence, C. L. & Ellefson, B. R.
Partner: UNT Libraries Government Documents Department

Completion Report for Well ER-12-4, Corrective Action Unit 99: Rainier Mesa - Shoshone Mountain (includes Errata Sheet)

Description: Well ER-12-4 was drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, in support of the Nevada Environmental Restoration Project at the Nevada Test Site, Nye County, Nevada. This well was drilled in May 2005, as part of a hydrogeologic investigation program for the Rainier Mesa-Shoshone Mountain Corrective Action Unit in the north-central portion of the Nevada Test Site. The well is located on Rainier/Aqueduct Mesa, northwest of Yucca Flat, within Area 12 of the Nevada Test Site. The well provided information regarding the radiological and physical environment near underground nuclear tests conducted in U12t Tunnel, information on the pre-Tertiary rocks in the area, and depth to the regional water table.
Date: May 1, 2006
Creator: United States. National Nuclear Security Administration. Nevada Site Office.
Partner: UNT Libraries Government Documents Department

Electrical impedance tomography of the 1995 OGI gasoline release

Description: Electrical impedance tomography (EIT) was used to image the plume resulting from a release of 378 liters (100 gallons) of gasoline into a sandy acquifer. Images were made in 5 planes before and 5 times during the release, to generate a detailed picture of the spatial as well as the temporal development of the plume as it spread at the water table. Information of the electrical impedance (both in phase and out of phase voltages) was used or several different frequencies to produce images. We observed little dispersion in the images either before or after the gasoline entered the acquifer. Likewise, despite some laboratory measurements of impedances, there was no evidence of a change in the reactance in the soil because of the gasoline.
Date: October 1, 1996
Creator: Daily, W. & Ramirez, A.
Partner: UNT Libraries Government Documents Department

RCRA Facility Investigation/Remedial Investigation Work Plan Addendum for the TNX Area Operable Unit Groundwater Radiological Characterization

Description: The purpose of this document is to present a sampling and analysis plan for the Water Table Aquifer for purposes of obtaining additional data for remedial decision-making with respect to radioactive contamination in the groundwater.
Date: June 17, 2002
Creator: Brewer, K.
Partner: UNT Libraries Government Documents Department

Basement Flooding and Foundation Damage from Water-Table Rise in the East New York Section of Brooklyn, Long Island, New York

Description: From purpose and scope: The purpose and scope of this report is to present the factors that have caused the water-table rise in the East New York section of Brooklyn. The rising water table in Kings County is not sudden or new; it has a history of more than two decades. It will refocus attention on the problem of changing ground-water levels in areas where intensive ground-water pumping has ceased or is occurring.
Date: October 1976
Creator: Soren, Julian
Partner: UNT Libraries Government Documents Department

Hydrologic Characterization Using Vadose Zone Monitoring Tools: Status Report

Description: Hydrologic characterization of the vadose zone (from soil surface to the underlying water table) is needed to assess contaminant migration from buried wastes. The Pacific Northwest National Laboratory, under contract with the U. S. Department of Energy's EM-50 (Subsurface Contamination Focus Area), and in collaboration with CH2MHILL Hanford Group, the Idaho National Engineering and Environmental Laboratory (INEEL), and Duratek Federal Services (DFS), deployed a suite of vadose-zone instruments at the Hanford Site near Richland, Washington. Several new instruments were tested.
Date: February 1, 2003
Creator: Gee, Glendon W.; Ward, Anderson L.; Sisson, James B.; Hubbell, Joel M.; Myers, David A. & Sydnor, Harold A.
Partner: UNT Libraries Government Documents Department

Influence of faults on groundwater flow and transport at YuccaMountain, Nevada

Description: Numerical simulations of groundwater flow at Yucca Mountain, Nevada are used to investigate how faults influence groundwater flow pathways and regional-scale macrodispersion. The 3-D model has a unique grid block discretization that facilitates the accurate representation of the complex geologic structure present in faulted formations. Each hydrogeologic layer is discretized into a single layer of irregular and dipping grid blocks, and faults are discretized such that they are laterally continuous and varied in displacement varies along strike. In addition, the presence of altered fault zones is explicitly modeled, as appropriate. Simulations show that upward head gradients can be readily explained by the geometry of hydrogeologic layers, the variability of layer permeabilities, and the presence of permeable fault zones or faults with displacement only, not necessarily by upwelling from a deep aquifer. Large-scale macrodispersion results from the vertical and lateral diversion of flow near the contact of high- and low-permeability layers at faults, and from upward flow within high-permeability fault zones. Conversely, large-scale channeling can occur as a result of groundwater flow into areas with minimal fault displacement. Contaminants originating at the water table can flow in a direction significantly different from that of the water table gradient, and isolated zones of contaminants can occur at the water table downgradient. By conducting both 2-D and 3-D simulations, we show that the 2-D cross-sectional models traditionally used to examine flow in faulted formations may not be appropriate. In addition, the influence of a particular type of fault cannot be generalized; depending on the location where contaminants enter the saturated zone, faults may either enhance or inhibit vertical dispersion.
Date: October 7, 1999
Creator: Cohen, Andrew J.B. & Sitar, Nicholas
Partner: UNT Libraries Government Documents Department

Application of direct-fitting, mass-integral, and multi-ratemethods to analysis of flowing fluid electric conductivity logs fromHoronobe, Japan

Description: The flowing fluid electric conductivity (FFEC) loggingmethod is an efficient way to provide information on the depths,salinities, and transmissivities of individual conductive featuresintercepted by a borehole, without the use of specialized probes. Usingit in a multiple-flow-rate mode allows, in addition, an estimate of theinherent "far-field" pressure heads in each of the conductive features.The multi-rate method was successfully applied to a 500-m borehole in agranitic formation and reported recently. The present paper presents theapplication of the method to two zones within a 1000-m borehole insedimentary rock, which produced, for each zone, three sets of logs atdifferent pumping rates, each set measured over a period of about oneday. The data sets involve a number of complications, such as variablewell diameter, free water table decline in the well, and effects ofdrilling mud. To analyze data from this borehole, we apply varioustechniques that have been developed for analyzing FFEC logs:direct-fitting, mass-integral, and the multi-rate method mentioned above.In spite of complications associated with the tests, analysis of the datais able to identify 44 hydraulically conducting fractures distributedover the depth interval 150-775 meters below ground surface. Thesalinities (in FEC), and transmissivities and pressure heads (indimensionless form) of these 44 features are obtained and found to varysignificantly among one another. These results are compared with datafrom eight packer tests with packer intervals of 10-80 m, which wereconducted in this borehole over the same depth interval. They are foundto be consistent with these independent packer-test data, thusdemonstrating the robustness of the FFEC logging method under non-idealconditions.
Date: August 1, 2007
Creator: Doughty, C.; Tsang, C.-F.; Hatanaka, K.; Yabuuchi, S. & Kurikami, H.
Partner: UNT Libraries Government Documents Department

Surface CO2 leakage during the first shallow subsurface CO2release experiment

Description: A new field facility was used to study CO2 migrationprocesses and test techniques to detect and quantify potential CO2leakage from geologic storage sites. For 10 days starting 9 July 2007,and for seven days starting 5 August 2007, 0.1 and 0.3 t CO2 d-1,respectively, were released from a ~;100-m long, sub-water table (~;2.5-mdepth) horizontal well. The spatio-temporal evolution of leakage wasmapped through repeated grid measurements of soil CO2 flux (FCO2). Thesurface leakage onset, approach to steady state, and post-release declinematched model predictions closely. Modeling suggested that minimal CO2was taken up by groundwater through dissolution, and CO2 spread out ontop of the water table. FCO2 spatial patterns were related to well designand soil physical properties. Estimates of total CO2 discharge along withsoil respiration and leakage discharge highlight the influence ofbackground CO2 flux variations on detection of CO2 leakagesignals.
Date: September 15, 2007
Creator: Lewicki, J.L.; Oldenburg, C.; Dobeck, L. & Spangler, L.
Partner: UNT Libraries Government Documents Department


Description: The objective of the study was to evaluate rainfall and water table elevation data in search of a correlation that could be used to understand and predict water elevation changes. This information will be useful in placing screen zones for future monitoring wells and operations of groundwater treatment units. Fifteen wells in the General Separations Area (GSA) at Savannah River Site were evaluated from 1986 through 2001. The study revealed that the water table does respond to rainfall with minimal delay. (Water level information was available monthly, which restricted the ability to evaluate a shorter delay period.) Water elevations were found to be related to the cumulative sum (Q-Delta Sum) of the difference between the average rainfall for a specific month and the actual rainfall for that month, calculated from an arbitrary starting point. Water table elevations could also be correlated between wells, but using the right well for correlation was very important. The strongest correlation utilized a quadratic equation that takes into account the rainfall in a specific area and the rainfall from an adjacent area that contributes through a horizontal flow. Specific values vary from well to well as a result of geometry and underground variations. R2's for the best models ranged up to 0.96. The data in the report references only GSA wells but other wells (including confined water tables) on the site have been observed to return similar water level fluctuation patterns.
Date: August 10, 2009
Creator: Smith, C.
Partner: UNT Libraries Government Documents Department

DCPT: A dual-continua random walk particle tracker fortransport

Description: Accurate and efficient simulation of chemical transport processes in the unsaturated zone of Yucca Mountain is important to evaluate the performance of the potential repository. The scale of the unsaturated zone model domain for Yucca Mountain (50 km{sup 2} area with a 600 meter depth to the water table) requires a large gridblock approach to efficiently analyze complex flow & transport processes. The conventional schemes based on finite element or finite difference methods perform well for dispersion-dominated transport, but are subject to considerable numerical dilution/dispersion for advection-dominated transport, especially when a large gridblock size is used. Numerical dispersion is an artificial, grid-dependent chemical spreading, especially for otherwise steep concentration fronts. One effective scheme to deal with numerical dispersion is the random walk particle method (RWPM). While significant progress has been made in developing RWPM algorithms and codes for single continuum systems, a random walk particle tracker, which can handle chemical transport in dual-continua (fractured porous media) associated with irregular grid systems, is still absent (to our knowledge) in the public domain. This is largely due to the lacking of rigorous schemes to deal with particle transfer between the continua, and efficient schemes to track particles in irregular grid systems. The main objectives of this study are (1) to develop approaches to extend RWPM from a single continuum to a dual-continua system; (2) to develop an efficient algorithm for tracking particles in 3D irregular grids; and (3) to integrate these approaches into an efficient and user-friendly software, DCPT, for simulating chemical transport in fractured porous media.
Date: April 11, 2000
Creator: Pan, L.; Liu, H.H.; Cushey, M. & Bodvarsson, G.S.
Partner: UNT Libraries Government Documents Department

Development of a Digital Model of Ground-Water Flow in Deeply Weathered Crystalline Rock, Chester County, Pennsylvania

Description: The model discussed in this report simulates recharge to, flow through, and discharge from the water-table aquifer representative of most of Chester County, Pennsylvania. It includes maps and graphs.
Date: August 1980
Creator: McGreevy, Laurence J. & Sloto, Ronald A.
Partner: UNT Libraries Government Documents Department