1. Ozark Plateau Aquifer System 55 water samples were taken from 3 separate aquifers in Madison County, AR 55 water samples were taken from 3 separate aquifers in Madison County, AR Ozark Aquifer– deepest Ozark Aquifer– deepest Springfield Plateau Aquifer Springfield Plateau Aquifer Undifferentiated Shallow Aquifers Undifferentiated Shallow Aquifers

2. BENTONCARROLL BOONE MARION VAN BUREN POPE CONWAY LOGAN JOHNSON SEBASTIAN CRAWFORD WASHINGTON FRANKLIN MADISON NEWTONSEARCY Location of Madison County in Northwest Arkansas

3. MADISON

4. Springfield Plateau Aquifer Ozark Aquifer The Silurian and Ordovician was a period of time in North America Noted for the production of Dolomites. The Ozark Aquifer flows through these dolomitic units.

6. Following QA/QC, data plots were produced Following QA/QC, data plots were produced No time series data are available for this project No time series data are available for this project Plots and data interpretation for this project attempt to characterize the water chemistry for each aquifer sampled Plots and data interpretation for this project attempt to characterize the water chemistry for each aquifer sampled

8. Piper Plot – All Samples Springfield Plateau Aquifer Undifferentiated Shallow Aquifers Ozark Aquifer

9. Waters from the Ozark Aquifer Plot As Calcium Bicarbonate waters

15. This plot shows that cation exchange is limited.

18. Dolomitic contribution of bicarbonate isn’t likely Is the loss of calcium responsible?