| Report Year: 2009 |
| Mitchell Lake, Black Hawk County |
| Carbon Balance Table |
| Parameter | 6/24/2009 | 7/29/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 151 | 139 | 145.0 | - | - | - | 135.7 | 106.8 | 120.3 | 152.5 | 191.7 | 174.3 |
| Dissolved Organic Carbon (mM) | 0.32 | 0.36 | 0.34 | - | - | - | 0.45 | 0.52 | 0.65 | 0.60 | - | - |
| Temperature (oC) | 26.0 | 22.8 | 24.4 | - | - | - | 25.7 | 24.3 | 23.1 | 24.6 | 23.3 | 24.2 |
| Specific Conductivity (μS/cm) | 400.0 | 400.0 | 400.00 | - | - | - | 426.57 | 436.68 | 597.55 | 646.44 | 559.75 | 554.29 |
| pH | 8.3 | 8.2 | 8.3 | - | - | - | 8.8 | 9.1 | 8.6 | 8.3 | 8.4 | 8.1 |
| I (Ionic Strength ?) | 0.0700 | 0.0700 | 0.0700 | - | - | - | 0.0746 | 0.0764 | 0.1046 | 0.1131 | 0.0980 | 0.0970 |
| Dissolved Inorganic Carbon (mM) | 2.96 | 2.76 | 2.86 | - | - | - | 2.51 | 1.84 | 2.31 | 2.98 | 3.75 | 3.46 |
| pCO2 (μatm) | 596 | 782 | 689.1 | - | - | - | 197.2 | 151.2 | 308.1 | 612.1 | 669.5 | 1103.3 |
| Equilibrium CO2 | 12.29 | 13.49 | 12.89 | - | - | - | 12.42 | 12.92 | 13.40 | 12.79 | 13.52 | 12.92 |
| CO2 (μM) | 19.81 | 28.51 | 24.16 | - | - | - | 6.94 | 5.53 | 11.54 | 21.03 | 25.34 | 38.57 |
| Δ CO2 from Equilibrium | 7.517 | 15.016 | 11.27 | - | - | - | -5.49 | -7.39 | -1.86 | 8.24 | 11.82 | 25.64 |