Geologic and Hydrologic Investigations Reese Air Force Base, Lubbock, Texas

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1989

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The Bureau of Economic Geology has characterized the geology and hydrology of the Ogallala and Blackwater Draw Formations at Reese Air Force Base to provide baseline information for better delineation of contamination on the base. Examination of five cores identified two predominant depositional facies: eolian sands and fluvial gravels. The gravels appear to be continuous across the base and may represent the major water-bearing unit; therefore, they may be the prime conduit for contaminant migration in the groundwater beneath the base. Continuous water-level recorder data from water-supply wells and monitoring wells on the base indicated typically confined and unconfined conditions. The degree of confinement may be controlled by the wells' proximity to the playa lakes on the base or by the relation of the water levels in the wells relative to the top of the water-bearing gravel unit. This variability in the degree of confinement indicates a more complex hydrologic setting than is normally recognized for the Ogallala aquifer.

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