| Report Year: 2009 |
| Mill Creek Lake, O'Brien County |
| Carbon Balance Table |
| Parameter | 7/6/2009 | 6/2/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 155 | 206 | 180.5 | - | - | 176.0 | 187.5 | 179.8 | 140.3 | 159.0 | 129.0 | 167.0 |
| Dissolved Organic Carbon (mM) | 0.35 | 0.42 | 0.39 | - | - | 0.37 | 0.49 | 0.35 | 0.65 | 0.74 | - | - |
| Temperature (oC) | 26.8 | 19.6 | 23.2 | - | - | 17.7 | 23.7 | 22.9 | 21.8 | 21.5 | 23.0 | 26.0 |
| Specific Conductivity (μS/cm) | 410.0 | 480.0 | 445.00 | - | - | 494.72 | 496.72 | 500.37 | 496.45 | 470.38 | 476.92 | 576.14 |
| pH | 8.8 | 8.6 | 8.7 | - | - | 9.1 | 8.5 | 8.6 | 8.5 | 8.6 | 8.6 | 8.8 |
| I (Ionic Strength ?) | 0.0718 | 0.0840 | 0.0779 | - | - | 0.0866 | 0.0869 | 0.0876 | 0.0869 | 0.0823 | 0.0835 | 0.1008 |
| Dissolved Inorganic Carbon (mM) | 2.92 | 3.98 | 3.45 | - | - | 3.12 | 3.62 | 3.46 | 2.71 | 3.06 | 2.44 | 3.08 |
| pCO2 (μatm) | 220 | 451 | 335.5 | - | - | 86.1 | 494.9 | 392.4 | 360.0 | 329.6 | 290.7 | 279.4 |
| Equilibrium CO2 | 12.01 | 14.85 | 13.43 | - | - | 15.74 | 13.23 | 13.73 | 14.03 | 14.24 | 13.48 | 12.32 |
| CO2 (μM) | 7.16 | 18.08 | 12.62 | - | - | 3.66 | 18.28 | 14.24 | 13.30 | 12.55 | 11.03 | 9.51 |
| Δ CO2 from Equilibrium | -4.853 | 3.231 | -0.81 | - | - | -12.08 | 5.05 | 0.51 | -0.72 | -1.69 | -2.45 | -2.81 |