| Report Year: 2009 |
| Black Hawk Lake, Sac County |
| Carbon Balance Table |
| Parameter | 6/1/2009 | 7/6/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 223 | 195 | 209.0 | - | 171.3 | 178.8 | 189.5 | 170.0 | 180.0 | 205.7 | 147.3 | 215.0 |
| Dissolved Organic Carbon (mM) | 0.58 | 0.43 | 0.51 | - | 0.46 | 0.67 | 0.55 | 0.46 | 0.79 | 0.81 | - | - |
| Temperature (oC) | 20.7 | 23.7 | 22.2 | - | 24.7 | 21.8 | 22.4 | 22.5 | 23.7 | 25.1 | 23.1 | 25.7 |
| Specific Conductivity (μS/cm) | 470.0 | 470.0 | 470.00 | - | 448.94 | 488.07 | 484.12 | 466.77 | 517.98 | 621.08 | 524.52 | 480.62 |
| pH | 7.9 | 8.0 | 7.9 | - | 8.4 | 8.7 | 8.3 | 8.2 | 8.0 | 8.2 | 7.6 | 8.3 |
| I (Ionic Strength ?) | 0.0823 | 0.0823 | 0.0823 | - | 0.0786 | 0.0854 | 0.0847 | 0.0817 | 0.0906 | 0.1087 | 0.0918 | 0.0841 |
| Dissolved Inorganic Carbon (mM) | 4.53 | 3.92 | 4.22 | - | 3.35 | 3.41 | 3.71 | 3.37 | 3.59 | 4.07 | 3.26 | 4.07 |
| pCO2 (μatm) | 2738 | 1780 | 2259.1 | - | 982.8 | 331.8 | 1080.3 | 1188.4 | 3057.5 | 1661.6 | 9910.0 | 1101.1 |
| Equilibrium CO2 | 14.34 | 13.13 | 13.73 | - | 12.82 | 14.05 | 13.69 | 13.76 | 13.22 | 12.65 | 13.45 | 12.69 |
| CO2 (μM) | 106.11 | 63.17 | 84.64 | - | 36.50 | 12.02 | 38.62 | 42.25 | 101.83 | 59.06 | 350.00 | 37.56 |
| Δ CO2 from Equilibrium | 91.773 | 50.036 | 70.90 | - | 23.68 | -2.03 | 24.93 | 28.50 | 88.60 | 46.41 | 336.55 | 24.87 |