| Report Year: 2009 |
| Casey Lake (Hickory Hills Lake), Tama County |
| Carbon Balance Table |
| Parameter | 6/23/2009 | 7/28/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 131 | 183 | 157.0 | - | - | - | 110.5 | 123.3 | 94.5 | 119.2 | 119.3 | 130.3 |
| Dissolved Organic Carbon (mM) | 0.42 | 0.52 | 0.47 | - | - | - | 0.62 | 0.45 | 0.87 | 0.76 | - | - |
| Temperature (oC) | 27.4 | 26.2 | 26.8 | - | - | - | 28.4 | 24.3 | 24.6 | 26.2 | 23.9 | 23.9 |
| Specific Conductivity (μS/cm) | 300.0 | 320.0 | 310.00 | - | - | - | 284.91 | 406.25 | 316.15 | 361.77 | 252.69 | 304.20 |
| pH | 8.8 | 7.8 | 8.3 | - | - | - | 9.7 | 8.9 | 9.0 | 9.1 | 9.4 | 9.2 |
| I (Ionic Strength ?) | 0.0525 | 0.0560 | 0.0543 | - | - | - | 0.0499 | 0.0711 | 0.0584 | 0.0633 | 0.0442 | 0.0532 |
| Dissolved Inorganic Carbon (mM) | 2.45 | 3.73 | 3.09 | - | - | - | 1.63 | 2.28 | 1.81 | 2.08 | 1.95 | 2.29 |
| pCO2 (μatm) | 157 | 2904 | 1530.7 | - | - | - | 19.1 | 213.9 | 180.4 | 184.8 | 88.2 | 77.3 |
| Equilibrium CO2 | 11.83 | 12.21 | 12.02 | - | - | - | 11.49 | 12.94 | 13.52 | 12.24 | 13.30 | 13.05 |
| CO2 (μM) | 5.02 | 95.87 | 50.44 | - | - | - | 0.60 | 7.82 | 6.65 | 6.19 | 3.84 | 2.75 |
| Δ CO2 from Equilibrium | -6.807 | 83.654 | 38.42 | - | - | - | -10.89 | -5.12 | -6.88 | -6.05 | -9.46 | -10.30 |