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HYDROSTRATIGRAPHY OF THE SAVANNAH RIVER SITE REGION Figure 7. Isopach map of the Gordon aquifer unit. Gordon Confining Unit The Gordon confining unit consists of fine grained, glauconitic, muddy sand and clay of the Warley Hill Formation (Fig. 2). In the study area, Warley Hill strata are generally less than 50 feet thick. The Gordon confining unit has been informally termed the “green clay” in updip areas of the SRS. The Gordon confining unit is not defined in the northwestern part of the SRS (Figs. 7 and 8); instead, discontinuous lenses of Warley Hill Formation from the “green clay” confining zone within the Steed Pond aquifer. Upper Three Runs Aquifer Unit The Upper Three Runs aquifer consists of all strata above the Warley Hill Formation, and includes the sandy and sometimes calcareous sediments of the Santee Limestone and all of the overlying Barnwell Group from the water table down to the top of the Gordon confining unit (Fig. 2). The Upper Three Runs aquifer is the updip terrigenous equivalent of the upper Floridan aquifer (Fig. 1). The Upper Three Runs aquifer varies from less than 50 to more than 200 feet thick in the SRS region (Fig. 8). Floridan Midville Aquifer System In the northwestern part of the SRS region, the Floridan and Dublin Midville aquifer system coalesce to form the Floridan Midville aquifer system (Figs. 1, 2, and 3). The Floridan Midville is divided into three aquifers separated by two confining units (Fig. 2). Figure 8. Isopach map of the Upper Three Runs and Steed Pond aquifer units. Steed Pond Aquifer Unit Where the Gordon confining unit becomes too thin to be an effective confining unit, the Gordon and Upper Three Runs aquifers merge to form the Steel Pond aquifer (Figs. 1 and 2). The Steed Pond includes strata from the water table down to the clays and muddy sands of the Ellenton Formation and upper Peedee Formation (Fig. 2). The Steed Pond varies from less than 30 to more than 150 feet thick in the SRS region (Fig. 8). CONCLUSION The hydrostratigraphic classification described herein utilizes a four-level hierarchy to delineate the hydrostratigraphy of the SRS region. The Piedmont hydrogeologic province is overlain by Cretaceous and Tertiary strata of Southeastern Coastal Plain hydrogeologic province. Downdip, the Coastal Plain sequence is divided into three aquifer systems and three confining systems. Updip thinning of the sedimentary sequence results in the coalescence of the threeaquifer systems into one at the Fall Line. The classification system allows subdivision of the hydrostratigraphic units into as much detail as the local geology demands while keeping within a regional framework. This feature makes the system especially attractive for use in site specific hydrostratigraphic studies where a complete description of the hydrologic regime is required. 75
ROLF K. AADLAND, PAUL A. THAYER, AND ANDREW D. SMITS REFERENCES Aadland, R.K., Smits, A.D., and Thayer, P.A., 1992a, Geology and hydrostratigrapy of the A/M area, Savannah River Site (SRS), South Carolina: U. S. Department of Energy Report WSRC- RP-92-440, Westinghouse Savannah River Company, Aiken, S.C. 104p. Aadland, R.K., Thayer, P.A. and Smits, A.D. 1992b, Hydrogeologic atlas of west central South Carolina: U.S. Department of Energy Report WDRC-RP-02-632, Westinghouse Savannah River company, Aiken, S.C., 126 p. Aucott, W.R., 1988. The predevelopment ground water flow system and hydrologic characteristics of the Coastal Plain aquifers of South Carolina: U.S. Geological Survey, Water Resources Investigations Report 86-8347, 66 p. Aucott, W.R., Davis, M.E., and Speiran, G.K., 1987. Geohydrologic framework of the Coastal Plain aquifers of South Carolina: U.S. Geological Survey Water Resources Investigations Report 85-4271, scale 1:1,000,000 7 sheets. Brooks, R., Clarke, J. S., and Faye, R.E., 1985, Hydrogeology of the Gordon aquifer system of east central Georgia: Georgia Geological Survey Information Circular 75, 41p. Burt, R.A., 1987a, Proposed criteria for nomenclature draft: South Carolina Hydrostratigraphic Subcommittee, Columbia, S.C. (Unpublished report on file at South Carolina Geological Survey, Columbia, S.C.). Burt, R.A., 1987b, Revised guidelines for classification of hydrostratigraphic units: South Carolina Hydrostratigraphic Subcommittee, Columbia, S.C. (Unpublished report on file at South Carolina Geological Survey, Columbia, S.C.). Clarke, J.S., Brooks, R., and Faye, R.E., 1985. Hydrogeology of the Dublin and Midville aquifer systems of east central Georgia: Georgia Geological Survey Information Circular 74, 62p. Colquhoun, D.J. Woollen, I.D., Van Nieuwenhuise, D.S., Padgett, G.G., Oldham, R.W., Boylan, D. C. Bishop, J.W., and Howell, P.D. 1983, Surface and subsurface stratigraphy, structure and aquifers of the South Carolina Coastal Plain: Columbia, S.C., Department of Health and Environment Control, 78 p. Krause, R.E., and Randolph, R.B., 1989, Hydrology of the Floridan aquifer system in southeast Georgia and adjacent parts of Florida and South Carolina: U.S. Geological Survey Professional Paper 1403-D, 65p. Lohman, S.W., ed., 1972, Definitions of selected groundwater terms – revisions and conceptual refinements: U.S. Geological Survey Water Supply Paper 1988, 21 p. Miller, J.A., 1986, Hydrogeologic framework of the Floridan aquifer system in Florida and in parts of Georgia, Alabama, and South Carolina: U.S. Geological Survey Professional Paper 1403-B, 91 p. Siple, G.E., 1967, Geology and ground water of the Savannah River Plant and vicinity, South Carolina: U.S. Geological Survey Water Supply Paper 1841, 113 p. 76
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