| Report Year: 2009 |
| Lake Keomah, Mahaska County |
| Carbon Balance Table |
| Parameter | 6/16/2009 | 7/22/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 133 | 120 | 126.5 | - | 97.0 | 146.0 | 113.8 | 102.3 | 72.7 | 91.7 | 106.0 | 155.3 |
| Dissolved Organic Carbon (mM) | 0.44 | 0.41 | 0.42 | - | 0.61 | 0.48 | 0.46 | 0.57 | 1.02 | 0.97 | - | - |
| Temperature (oC) | 19.7 | 23.8 | 21.8 | - | 28.0 | 27.4 | 27.7 | 24.2 | 25.5 | 27.9 | 24.7 | 25.1 |
| Specific Conductivity (μS/cm) | 370.0 | 320.0 | 345.00 | - | 282.01 | 462.19 | 360.46 | 306.76 | 291.12 | 331.10 | 314.72 | 314.62 |
| pH | 7.9 | 7.9 | 7.9 | - | 9.0 | 8.4 | 9.4 | 9.0 | 9.3 | 9.2 | 9.1 | 8.4 |
| I (Ionic Strength ?) | 0.0648 | 0.0560 | 0.0604 | - | 0.0494 | 0.0809 | 0.0631 | 0.0537 | 0.0509 | 0.0579 | 0.0551 | 0.0551 |
| Dissolved Inorganic Carbon (mM) | 2.69 | 2.42 | 2.56 | - | 1.72 | 2.83 | 1.85 | 1.86 | 1.22 | 1.53 | 1.88 | 3.06 |
| pCO2 (μatm) | 1444 | 1273 | 1358.8 | - | 155.9 | 498.4 | 92.6 | 83.3 | 29.2 | 139.2 | 104.2 | 1190.1 |
| Equilibrium CO2 | 14.78 | 13.10 | 13.94 | - | 11.69 | 11.82 | 11.74 | 12.99 | 12.56 | 11.67 | 12.81 | 12.65 |
| CO2 (μM) | 57.70 | 45.09 | 51.40 | - | 4.69 | 15.84 | 3.05 | 2.92 | 1.08 | 4.70 | 3.81 | 42.92 |
| Δ CO2 from Equilibrium | 42.917 | 31.991 | 37.45 | - | -7.01 | 4.03 | -8.69 | -10.06 | -11.48 | -6.97 | -9.00 | 30.27 |