| Report Year: 2009 |
| George Wyth 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) | 126 | 129 | 127.5 | - | 152.3 | 134.7 | 126.7 | 141.3 | 94.7 | 116.7 | 122.0 | 125.0 |
| Dissolved Organic Carbon (mM) | 0.38 | 0.46 | 0.42 | - | 0.36 | 0.36 | 0.40 | 0.32 | 0.66 | 0.63 | - | - |
| Temperature (oC) | 25.5 | 23.8 | 24.7 | - | 25.4 | 25.5 | 26.4 | 24.4 | 24.4 | 26.0 | 24.7 | 24.7 |
| Specific Conductivity (μS/cm) | 440.0 | 430.0 | 435.00 | - | 550.43 | 617.37 | 570.80 | 660.44 | 553.64 | 545.05 | 376.84 | 447.38 |
| pH | 8.4 | 8.3 | 8.4 | - | 8.6 | 8.9 | 8.6 | 8.5 | 8.7 | 8.7 | 8.7 | 8.6 |
| I (Ionic Strength ?) | 0.0770 | 0.0753 | 0.0761 | - | 0.0963 | 0.1080 | 0.0999 | 0.1156 | 0.0969 | 0.0954 | 0.0659 | 0.0783 |
| Dissolved Inorganic Carbon (mM) | 2.46 | 2.53 | 2.50 | - | 2.89 | 2.44 | 2.42 | 2.71 | 1.79 | 2.21 | 2.32 | 2.39 |
| pCO2 (μatm) | 436 | 517 | 476.5 | - | 311.9 | 150.6 | 271.4 | 582.2 | 172.2 | 276.9 | 201.0 | 264.7 |
| Equilibrium CO2 | 12.47 | 13.08 | 12.78 | - | 12.52 | 12.54 | 12.16 | 12.88 | 12.94 | 12.34 | 13.03 | 12.75 |
| CO2 (μM) | 14.71 | 18.26 | 16.49 | - | 10.68 | 5.02 | 9.02 | 20.49 | 6.33 | 9.67 | 7.26 | 9.19 |
| Δ CO2 from Equilibrium | 2.238 | 5.181 | 3.71 | - | -1.84 | -7.52 | -3.15 | 7.61 | -6.61 | -2.67 | -5.76 | -3.56 |