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Geohydrology of Fractured Crystalline Rock of Northern Georgia

Progress and Significant Results, 2006—2007

  • Coweta County—Developed plan of study to include well inventory and borehole geophysical logging in selected wells.
  • Forsyth County— Collected borehole geophysical logs and conducted borehole flowmeter traverse in two wells located along the Chattahoochee River north of Littles Ferry Bridge. Developed plan of study for well-inventory program.
  • Oconee County— Collected borehole geophysical logs, grab water samples, and conducted borehole flowmeter traverse in two wells near the town of Watkinsville to evaluate causes of water-quality problems in the well water. In one well, dissolved carbon dioxide was being emitted; water in the other well was contaminated by iron bacteria.
  • Troup County— Completed compilation of data and field well inventory. Data for 138 wells were added to the existing 79-well NWIS database, which increased the total to 217 wells. Developed spatial hydrological data layers for wells and surficial geology. Began preparation of final report.
  • Rockdale County— Collected borehole geophysical logs in two test wells located adjacent to production wells in the Conyers area to determine structural orientations of fractures and bedrock foliation. This information was used to help assess the interconnection between test wells and production wells as a follow-up to aquifer testing conducted during 2005 (Williams and Cressler, 2007).
  • Other areas—In addition to the efforts in each of these counties, borehole geophysical logs were collected at several other sites in the Piedmont and Blue Ridge Provinces, including two wells in White County, one well in Habersham County, and one well in Madison County.
  • Outreach—Prepared a Fact Sheet describing how borehole geophysical logs can provide valuable information to evaluate ground-water resources in fractured crystalline rock (U.S. Geological Survey, 2007). The Fact Sheet describes the types of data collected and how these data are used to evaluate the water-bearing characteristics of fractured crystalline rock. See

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Page Last Modified: Wednesday, 10-Mar-2010 14:17:48 EST