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This report presents data collected as part of a hydrologic investigation of Darlington, Dillon, Florence, Marion, and Marlboro Counties in the northeastern part of the Coastal Plain of South Carolina. These data include lithologic descriptions of sediment recovered from two continuously cored boreholes and water-quality results for samples collected from 17 existing wells. One continuously cored borehole was drilled near Lake Darpo in the northern part of Darlington County to a total depth of 447 feet below land surface. The other borehole was drilled in Lake City in the south-central part of Florence County to a total depth of 1,090 feet below land surface. Water-quality results presented in this report include specific conductance, dissolved oxygen, temperature, pH, alkalinity, majorand minor-ion chemistry, and hydrogen sulflde. INTRODUCTION Concerns among ground-water users about the quantity and quality of groundwater resources in the northeastern part of the Coastal Plain of South Carolina resulted in a hydrologic investigation by the U.S. Geological Survey (USGS) in cooperation with the South Carolina Water Resources Commission. This investigation included mudrotary-wireline coring of two boreholes and analysis of water samples from 17 existing wells to obtain data about the hydrogeology, geochemistry, and water quality of the ground-water-flow system beneath Darlington, Dillon, Florence, Marion, and Marlboro Counties (figs. 1,2, and 3). Purpose and Scope This report summarizes the results of a study to describe lithologic and waterquality data collected within a five-county study area. This report includes lithologic descriptions of cored sediments and geophysical logs of the boreholes located near Lake Darpo in Darlington County and Lake City in Florence County. Water-quality data in this report include field measurements and laboratory analyses of samples collected from 17 existing wells in the five-county study area in November 1988 and in April and May 1991.

u.s. geological survey open file report/open-file report

Lithologic descriptions of two cores and ground-water-quality data from five counties in the northeastern part of the coastal plain of South Carolina, 1988 and 1991