| Report Year: 2009 |
| Meyers Lake, Black Hawk County |
| Carbon Balance Table |
| Parameter | 7/28/2009 | 6/23/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 108 | 81 | 94.5 | - | - | - | 94.7 | 113.3 | 59.7 | 90.8 | 96.0 | 99.0 |
| Dissolved Organic Carbon (mM) | 0.60 | 0.45 | 0.53 | - | - | - | 0.68 | 0.54 | 0.85 | 0.89 | - | - |
| Temperature (oC) | 27.1 | 30.5 | 28.8 | - | - | - | 26.5 | 24.8 | 24.4 | 25.6 | 23.5 | 24.7 |
| Specific Conductivity (μS/cm) | 430.0 | 420.0 | 425.00 | - | - | - | 401.69 | 527.90 | 369.79 | 447.49 | 350.63 | 388.81 |
| pH | 9.3 | 8.9 | 9.1 | - | - | - | 9.1 | 8.7 | 9.1 | 8.8 | 8.7 | 8.4 |
| I (Ionic Strength ?) | 0.0753 | 0.0735 | 0.0744 | - | - | - | 0.0703 | 0.0924 | 0.0647 | 0.0783 | 0.0614 | 0.0680 |
| Dissolved Inorganic Carbon (mM) | 1.81 | 1.48 | 1.65 | - | - | - | 1.64 | 2.12 | 1.05 | 1.70 | 1.82 | 1.93 |
| pCO2 (μatm) | 37 | 81 | 59.0 | - | - | - | 124.1 | 232.0 | 46.8 | 160.0 | 244.5 | 329.9 |
| Equilibrium CO2 | 11.91 | 10.85 | 11.38 | - | - | - | 12.15 | 12.72 | 12.91 | 12.44 | 13.47 | 12.75 |
| CO2 (μM) | 1.19 | 2.38 | 1.78 | - | - | - | 4.36 | 8.15 | 1.72 | 5.50 | 10.12 | 11.40 |
| Δ CO2 from Equilibrium | -10.715 | -8.471 | -9.59 | - | - | - | -7.79 | -4.57 | -11.20 | -6.94 | -3.35 | -1.35 |