| Report Year: 2009 |
| Green Belt Lake, Black Hawk County |
| Carbon Balance Table |
| Parameter | 7/29/2009 | 6/24/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 120 | 117 | 118.5 | - | 121.3 | 107.3 | 101.7 | 102.7 | 69.8 | 96.5 | 98.7 | 113.0 |
| Dissolved Organic Carbon (mM) | 0.32 | 0.32 | 0.32 | - | 0.70 | 0.47 | 0.60 | 0.52 | 0.79 | 0.68 | - | - |
| Temperature (oC) | 24.9 | 25.9 | 25.4 | - | 26.0 | 26.1 | 26.7 | 24.7 | 24.6 | 25.8 | 24.9 | 24.8 |
| Specific Conductivity (μS/cm) | 540.0 | 500.0 | 520.00 | - | 750.11 | 728.22 | 687.39 | 750.03 | 650.99 | 678.99 | 499.75 | 613.50 |
| pH | 8.1 | 8.5 | 8.3 | - | 8.4 | 8.9 | 9.0 | 8.5 | 8.5 | 8.3 | 8.6 | 8.5 |
| I (Ionic Strength ?) | 0.0945 | 0.0875 | 0.0910 | - | 0.1313 | 0.1274 | 0.1203 | 0.1313 | 0.1139 | 0.1188 | 0.0875 | 0.1074 |
| Dissolved Inorganic Carbon (mM) | 2.39 | 2.27 | 2.33 | - | 2.36 | 1.92 | 1.80 | 1.95 | 1.34 | 1.89 | 1.88 | 2.18 |
| pCO2 (μatm) | 897 | 337 | 617.1 | - | 445.0 | 162.6 | 91.3 | 310.1 | 255.4 | 467.8 | 202.9 | 297.1 |
| Equilibrium CO2 | 12.69 | 12.31 | 12.50 | - | 12.30 | 12.31 | 12.08 | 12.76 | 12.87 | 12.38 | 12.94 | 12.73 |
| CO2 (μM) | 30.77 | 11.21 | 20.99 | - | 15.06 | 5.21 | 3.11 | 10.83 | 9.48 | 15.67 | 7.70 | 10.21 |
| Δ CO2 from Equilibrium | 18.080 | -1.095 | 8.49 | - | 2.76 | -7.10 | -8.97 | -1.93 | -3.39 | 3.29 | -5.24 | -2.52 |