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Water Quality Monitoring of the Cambrian-Ordovician Aquifer System in Iowa and Illinois

Minnesota. Wisconsin. Water Quality Monitoring of the Cambrian-Ordovician Aquifer System in Iowa and Illinois. Iowa. Illinois. Indiana. Missouri. U.S. Department of the Interior U.S. Geological Survey National Water Quality Assessment Program. NAWQA Cycle I LONG-TERM GOALS:.

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Water Quality Monitoring of the Cambrian-Ordovician Aquifer System in Iowa and Illinois

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  1. Minnesota Wisconsin Water Quality Monitoring of the Cambrian-Ordovician Aquifer System in Iowa and Illinois Iowa Illinois Indiana Missouri U.S. Department of the Interior U.S. Geological Survey National Water Quality Assessment Program

  2. NAWQA Cycle I LONG-TERM GOALS: • Describe current water-quality conditions for a large part of the Nation’s freshwater streams, rivers, and aquifers • Describe how water quality is changing over time • Improve understanding of the primary natural and human factors that affect water-quality conditions

  3. NAWQA Cycle I

  4. NAWQA Cycle II • Same long-term goals as Cycle I • Build upon initial assessments of water-quality conditions • Increase investigations of long-term trends and the factors that affect water quality

  5. NAWQA Cycle II

  6. NAWQA Ground Water Synthesis

  7. Cambrian-Ordovician Aquifer System • Covers approximately 177,000 square miles in the upper Midwest • Is comprised of multiple aquifer units interbedded with leaky confining units Minnesota Wisconsin Iowa Indiana Illinois Missouri

  8. Cambrian-Ordovician Aquifer System Bedrock geology - Iowa Cretaceous Jurassic Pennsylvanian Mississippian Devonian Silurian Ordovician Cambrian Precambrian

  9. Cambrian-Ordovician Aquifer System SITE SELECTION STRATEGY Iowa and Illinois

  10. Cambrian-Ordovician Aquifer System SITE SELECTION STRATEGY Iowa and Illinois

  11. Cambrian-Ordovician Aquifer System SITE SELECTION STRATEGY Iowa and Illinois

  12. Cambrian-Ordovician Aquifer System FINAL SAMPLING SITE LOCATIONS Iowa

  13. Cambrian-Ordovician Aquifer System CONSTITUENTS SAMPLED Iowa • Major inorganics • Bromide Manganese • Calcium Potassium • Chloride Silica • Fluoride Sodium • Iron Sulfate • Magnesium • Trace elements Aluminum Lithium Antimony Manganese Arsenic Molybdenum Barium Nickel Beryllium Selenium Boron Silver Cadmium Strontium Chromium Thallium Cobalt Uranium Copper Vanadium Lead Zinc • Nutrients • Nitrogen, ammonia • Nitrogen, nitrite • Nitrogen, nitrite + nitrate • Total nitrogen (NH3+NO2+NO3+organic) • Phosphorus, orthophosphate • Dissolved organic carbon • Pesticides • Volatile organic carbons • Radium isotopes • Ra-226 • Ra-228 • Radon • Tritium

  14. Cambrian-Ordovician Aquifer System PRELIMINARY RESULTS Iowa • Major inorganics • 70% (21 of 30) of wells sampled > 300 mg/L of iron (drinking water alert) • half of wells sampled > 250 mg/L of sulfate (drinking water alert) • Pesticides • rarely detected (5 pesticides detected at least once); measured concentrations low • Volatile organic carbons • rarely detected (5 VOCs detected at least once); measured concentrations low • Radon • values ranged from 40 – 460 pCi/L, with a median of 110 pCi/L • Radium isotopes • 5 of 30 wells exceeded the drinking water alert of 5 pCi/L for Ra-226

  15. Cambrian-Ordovician Aquifer System SUMMARY • 30 additional sites to be sampled in Illinois, 2009 • consistent sampling techniques and same analytical schedules • combine data sets for further analysis

  16. Acknowledegments: Field support : Jessica Garret, Iowa Water Science Center Brian Mailot, Ohio Water Science Center Eric Sadorf, North Carolina Water Science Center Erik Smith, Iowa Science Center Contact information: Kymm Barnes U.S. Geological Survey Iowa Water Science Center kkbarnes@usgs.gov

  17. The NAWQA Program: http://water.usgs.gov/nawqa/

  18. The USGS: http://www.usgs.gov/

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