Groundwater flow and tritium migration in coastal plain sediments, Savannah River Site, South Carolina
- Westinghouse Savannah River Company, Aiken, SC (United States)
- Univ. of North Carolina (United States)
Groundwater modeling was performed to assess groundwater flow and contaminant migration for a tritium plume at the Savannah River Site (SRS). The study supports the Corrective Measures Study and Interim Action Plan regulatory documents for the Old Radioactive Waste Burial Ground (ORWBG). Modeling scenarios were designed to provide data for an economic analysis of alternatives, and subsequently evaluate the effectiveness of the selected remedial technologies for tritium reduction to surface waters. Scenarios assessed include no action, vertical and surface barriers, pump-treat-reinject, and vertical recirculation wells. Hydrostratigraphic units in the area consist of fluvial, deltaic, and shallow marine sand, mud, and calcareous sediments that exhibit abrupt facies changes over short distances. The complex heterogeneity of the sediments, along with characterization data, and tritium contaminant source data required a three-dimensional model be developed in order to accurately illustrate the size, shape and orientation of the plume. Results demonstrate that the shallow confining zone in the region controls the migration path of the plume. The size and shape of the plume were modeled in three-dimensions using detailed core, geophysical and cone-penetrometer data, depth-discrete contaminant data, monitoring well data, and seepline/surface water samples. Three-dimensional tritium plume maps were created for the >20,000, >500 and >50 pCi/ml concentration levels. The three-dimensional plume maps and volumetric calculations indicate that 63 percent of the total activity and 12 percent of the volume above 50 pCi/ml resides in a layer less than 6-m thick riding on top of the shallow confining zone.
- Research Organization:
- Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-96SR18500
- OSTI ID:
- 604379
- Report Number(s):
- WSRC-MS-97-00705; CONF-980519-; ON: DE98050014; TRN: 98:005458
- Resource Relation:
- Conference: American Association of Petroleum Geologists meeting, Salt Lake City, UT (United States), 17-20 May 1998; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
SAVANNAH RIVER PLANT
REMEDIAL ACTION
GROUND WATER
MONITORING
RADIOECOLOGICAL CONCENTRATION
TRITIUM
RADIONUCLIDE MIGRATION
FLOW MODELS
RADIOACTIVE WASTES
GROUND DISPOSAL
F CODES
COMPUTERIZED SIMULATION