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3 Introduction 4 Purpose and scope 4 Previous studies4 Acknowledgments 4 General description of study area5 Geohydrology5 Geology 5 Glacial deposits  5 Bedrock 10 Hydrology 10 Surface water  10 Ground water 10 Source10 Water table12 Changes in water levels 14 Recharge 14 Water quality 16 Quality of precipitation, surface water, and ground water16 Precipitation 16 Surface water  18 Physical characteristics18 Major inorganic constituents 18 Nutrients19 Trace elements 19 Pesticides and total phenols 19 Ground water 20 Physical and chemical characteristics20 Pesticides, volatile organics, and total phenols 21 Selected chemical characteristics 22 Effects of land use on ground-water quality23 General land use  23 Effects of chemical inputs on the hydrologic system  24 Municipal and industrial inputs 24 Agricultural and rural residential inputs 24 Animal wastes. 24 Septic-tank discharges24 Fertilizer applications. 24 Geohydrologic factors affecting susceptibility of ground water to contamination26 Depth to water  27 Net recharge 27 Aquifer media  27 Soil media 27 Topography  28 Impact of the unsaturated zone 28 Hydraulic conductivity of the aquifer 28 Summary29 Selected References 30 Definition of terms31 Tables of data 32 Appendix: Agricultural DRASTIC System36

Geohydrology and water quality of Kalamazoo County, Michigan, 1986-88