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^ 1 Inlroduction^ 1 Purpose and scope 3 Acknowledgments 3 Geology 3 Hydrology 14 Water levels 19 Flowmeter logging 19 Results of tracer testing 22 Summary and conclusions  27 References cited 28 Appendixes 1-3: 1. Summary of data collected during the tracer test Water-level data from selected wells 30 2. Summary of data collected during the tracer test Barometric pressure data 44 3. Summary of data collected during the tracer test Water-level data corrected for fluctuations in barometric pressure 46 FIGURES 1-2. Maps showing: 1. Location of the study area and monitoring wells, near Byron, Illinois 2 2. Generalized geologic column showing stratigraphy, geohydrologic units, and median primary porosity of Ordovician and Quaternary deposits, near Byron, Illinois 4 3-8. Diagrams showing: 3. Natural-gamma log, lithologic log, and generalized stratigraphic section for well MW2, near Byron, Illinois 6 4. Natural-gamma, acoustic-televiewer, and flowmeter logs; stratigraphy; and transmissivity in the test intervals isolated with a packer assembly for well SPW, near Byron, Illinois  7 5. Natural-gamma, acoustic-televiewer, and flowmeter logs; stratigraphy; and transmissivity in the test intervals isolated with a packer assembly for well PZ1, near Byron, Illinois  8 6. Natural-gamma, acoustic-televiewer, and flowmeter logs, and stratigraphy for well PZ2, near Byron, Illinois 9 7. Natural-gamma, acoustic-televiewer, and flowmeter logs, and stratigraphy for well PZ3, near Byron, Illinois 10 8. Natural-gamma, acoustic-televiewer, and flowmeter logs; stratigraphy; and transmissivity in the test intervals isolated with a packer assembly for well AW1S, near Byron, Illinois 11 9. Map showing water-table altitude, fracture traces, and lines of geologic section, near Byron, Illinois, JulyS, 1993 12 10-13. Diagrams showing: 10. Geologic section, A-A" near Byron, Illinois 13 11. Velocity tomograms between wells AW1S-PZ2, PZ2-PZ3, and PZ3-SPW, near Byron, Illinois  17 12. Attenuation tomograms between wells AW1S-PZ2, PZ2-PZ3, and PZ3-SPW, near Byron, Illinois 18 13. Concentration of bromide ion in water pumped from well SPW during the tracer injection phase of the tracer test, near Byron, Illinois, July 12-14, 1993 26 TABLES 1. Summary of data for inclined fractures identified during acoustic-televiewer logging, near Byron, Illinois 15 2. Summary of reflector data identified during single-hole directional reflection surveys, and fracture data obtained during acoustic-televiewer surveys, near Byron, Illinois 16 3. Monitoring well and water-level data, near Byron, Illinois 20

Geology, hydrology, and results of tracer testing in the Galena-Platteville aquifer at a waste-disposal site near Byron, Illinois