Program plan for TNX Area groundwater characterization wells

Technical Report · Fri May 19 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5650791· OSTI ID:5650791

Nichols, R L

The TNX Area post-Cretaceous hydrogeological section consists of an unconfined aquifer in recent to Pliestocene age sediments and a confined aquifer in tertiary aged sediments. The unconfined aquifer is a local water bearing reservoir and will not be correlated to a specific stratigraphic unit at this time. Depth to the water table ranges from 25 feet at the New TNX Seepage Basin to 50 feet at the Old TNX Seepage Basin. The unconfined aquifer is 45--50 feet thick and outcrops in the swamp to the west of TNX. The hydraulic gradient in the unconfined aquifer decreases westerly across the TNX Area from 0.05 to 0.01. The unconfined aquifer is separated from the underlying confined aquifer by a sandy slit aquitard (A1) which is approximately 5--10 feet thick. Researchers reported an increase in hydraulic head across this unit of approximately 8 feet which results in an upward gradient between the unconfined and confined aquifer. The confined Tertiary aquifer (C1) at TNX is 25--30 feet thick and can generally be found 60 to 90 feet below the surface. The C1 aquifer is part of the aquifer commonly referred to as the Congaree'' which occurs in the Congaree Formation. The C1 aquifer lies on the Lower Tertiary aquitard (A2) which is 45--55 feet thick and is commonly referred to as the Ellenton Formation.'' Currently there is an upward gradient across A2 with a head differential of 28 feet. Regional hydrogeologic models indicate that the C1 aquifer discharges to the Savannah River producing westward groundwater flow in C1. 3 figs., 1 tab.

• Research Organization: Westinghouse Savannah River Co., Aiken, SC (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC09-76SR00001
• OSTI ID: 5650791
• Report Number(s): WSRC-RP-89-269; ON: DE90000655
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AQUIFERS
GROUND WATER
HYDROGEN COMPOUNDS
HYDROLOGY
MATHEMATICAL MODELS
MONITORING
NATIONAL ORGANIZATIONS
OXYGEN COMPOUNDS
PLANNING
SAVANNAH RIVER PLANT
SEDIMENTS
SITE CHARACTERIZATION
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WATER
WATER WELLS
WELLS