Contaminants in the Mississippi River, 1987-92

TABLES 1. Classification of naturally occurring metals according to their toxicity and availability in the hydrologic environment 2. U.S. Environmental Protection Agency maximum contaminant levels for heavy-metal concentrations in drinking water and water supporting aquatic life, and criteria for open-water disposal of polluted sediments 3. Selected heavy metals presently or formerly used in major industries along the Mississippi River 4. Average releases of heavy metals into the Mississippi River from a large metropolitan wastewater-treatment plant in St. Paul, Minnesota 5. U.S. Environmental Protection Agency maximum contaminant levels (MCLs) for nitrogenous nutrients in drinking water 6. Sources of nutrients in surface waters 7. Summary statistics of nutrient concentrations during 1991-92 in the Mississippi River and all measured tributaries 8. Physiochemical properties, health-based limits for drinking water, and aquatic-life guidelines for selected major pesticides in the Mississippi River Basin 9. Estimated loads of pesticides, in kilograms, transported by the Mississippi River and major tributaries, April 1991 through March 1992 10. Organic compounds measured to evaluate wastewater contamination of the Mississippi River, 1987-92 11. Summary assessment of organic contaminants in the Mississippi River and its major tributaries Contents IX