Browsing by Subject "perched aquifer"

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Hydrogeology of a Perched Aquifer in the Pantex Plant Region: Preliminary Results
(1992) Fayar, Alan E.
Significant progress has been made in the delineation, measurement, and description of a perched aquifer(s) in the region of the U.S. Department of Energy Pantex Plant, and in the determination of hydraulic characteristics of perched aquifers. Major areas of progress include documentation of the spatial extent of the perched aquifer and of mechanisms controlling directions and rates of ground-water flow. New data have been collected from (1) aquifer tests performed in five perched aquifer monitoring wells at the Pantex Plant, (2) static water-level measurements in six new perched aquifer monitoring wells drilled at the Pantex Plant in the spring of 1992, (3) regional surveys conducted to locate domestic and agricultural wells producing from either the perched aquifer that extends under the Pantex Plant or from a possibly separate perched aquifer in the region of interest, and (4) extensive chemical and isotopic sampling of waters produced from the perched aquifer. Hydrologic results derived from these data will be discussed in this report, and chemical results will be reviewed in a separate report.
The Areal Extent and Hydraulic Continuity of Perched Ground Water in the Vicinity of the Pantex Plant
(1993) Mullican, William F.; Fryar, A. E.; Johns, Norman D.
Groundwater contamination at the Pantex Plant is currently restricted to a perched aquifer(s) above the regional Ogallala aquifer water table. Therefore, the areal extent and hydraulic continuity of this unit are critical factors in the overall hydrologic characterization required for the design of effective remediation activities. Another important question is determining whether any privately owned domestic wells are producing from the perched aquifer(s) in areas downgradient from and hydrologically connected to known or possible contaminated areas on the Pantex Plant. It should be noted, however, that a continuous saturated zone is not the only scenario by which point-source and non-point-source contaminants could migrate. All recharging groundwater that is perched will eventually move through the fine-grained, low-permeability zone that underlies the perched aquifer(s) and resume a downward track to the Ogallala aquifer. In addition, the results of this study clearly illustrate areas where there is no perched aquifer(s), and thus there may be no perching layer, within the boundary of the Pantex Plant. In these areas where a perching layer is absent, there will be no retarding effect created by the perched aquifer(s) on the vertical movement of recharge to the Ogallala aquifer.