| Report Year: 2009 |
| North Twin Lake, Calhoun County |
| Carbon Balance Table |
| Parameter | 7/28/2009 | 6/4/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 148 | 160 | 154.0 | - | 171.5 | 159.2 | 160.5 | 156.7 | 121.9 | 173.8 | 134.0 | 166.7 |
| Dissolved Organic Carbon (mM) | 0.56 | 1.14 | 0.85 | - | 1.63 | 0.70 | 0.86 | 0.64 | 1.02 | 1.08 | - | - |
| Temperature (oC) | 24.7 | 20.2 | 22.5 | - | 23.9 | 25.4 | 24.7 | 23.1 | 22.5 | 25.2 | 23.9 | 25.2 |
| Specific Conductivity (μS/cm) | 450.0 | 450.0 | 450.00 | - | 520.54 | 494.76 | 496.60 | 499.04 | 517.36 | 604.46 | 542.18 | 463.72 |
| pH | 8.2 | 8.0 | 8.1 | - | 8.2 | 9.0 | 8.4 | 8.6 | 8.7 | 8.3 | 8.6 | 8.6 |
| I (Ionic Strength ?) | 0.0788 | 0.0788 | 0.0788 | - | 0.0911 | 0.0866 | 0.0869 | 0.0873 | 0.0905 | 0.1058 | 0.0949 | 0.0812 |
| Dissolved Inorganic Carbon (mM) | 2.94 | 3.23 | 3.08 | - | 3.39 | 2.85 | 3.12 | 3.01 | 2.29 | 3.56 | 2.56 | 3.00 |
| pCO2 (μatm) | 909 | 1522 | 1215.5 | - | 915.4 | 114.1 | 509.3 | 370.9 | 214.7 | 801.0 | 665.0 | 291.8 |
| Equilibrium CO2 | 12.75 | 14.56 | 13.65 | - | 13.10 | 12.52 | 12.91 | 13.45 | 13.74 | 12.60 | 13.10 | 13.09 |
| CO2 (μM) | 31.33 | 59.87 | 45.60 | - | 32.72 | 3.91 | 18.32 | 12.94 | 7.59 | 27.40 | 21.85 | 10.58 |
| Δ CO2 from Equilibrium | 18.579 | 45.313 | 31.95 | - | 19.62 | -8.61 | 5.41 | -0.52 | -6.15 | 14.80 | 8.75 | -2.51 |