Data were collected in the White River and its tributaries in and near Indianapolis, Indiana, on the diversity and density of benthic invertebrates; concentrations of metals, insecticides, herbicides, and semivolatile organic compounds sorbed on streambed sediments; and particle-size distribution of streambed sediments. A total of 369 benthic-invertebrate samples were collected at 21 sites during late spring or summer and early fall 1994 through 1996; of these, 30 were quality-control samples. A total of 33 streambed-sediment samples were collected at 14 sites during

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Contents v Conversion Factors and Abbreviations Multiply By To obtain inch (in.) 25.4 millimeter foot (ft) 0.3048 meter mile (mi) 1.609 kilometer square mile (mi 2) 2.590 square kilometer Concentrations of chemical constituents in sediment are given in metric units. Chemical concentrations are given in grams per kilogram (g/kg), milligrams per kilogram (mg/kg), micrograms per gram (µg/g), or micrograms per kilogram (µg/kg). Grams per kilogram is a unit expressing the concentration of chemical constituents as weight (grams) per unit weight (kilogram) of sediment.

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FIGURES 1. Map showing location of six study watersheds and streamflow-gaging stations in Clay, Owen, Sullivan, and Vigo Counties A3 2. Map showing location of Illinois Basin, limit of coal-bearing Pennsylvanian rocks, and outcrops of selected coal members A4 3. Generalized geologic section of study area showing Pennsylvanian rocks and selected coal members dipping southwest AS 4. Geologic column of Pennsylvanian System in Indiana A6 5. Geologic column of middle and upper parts of Mississippian System in Indiana A7 6. Map showing geomorphic units and Wisconsin glacial boundary A8 7-9. Graphs showing: 7. Mean, maximum, and minimum monthly precipitation at Terre Haute, 1955-82 A10 8. Mean, maximum, and minimum monthly air temperature at Terre Haute, 1955-82 A10 Contents 1.