| Report Year: 2009 |
| Otter Creek Lake, Tama County |
| Carbon Balance Table |
| Parameter | 7/27/2009 | 6/22/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 142 | 152 | 147.0 | - | - | - | 136.2 | 143.0 | 100.2 | 142.7 | 150.7 | 155.0 |
| Dissolved Organic Carbon (mM) | 0.34 | 0.39 | 0.37 | - | - | - | 0.54 | 0.36 | 0.80 | 0.77 | - | - |
| Temperature (oC) | 24.2 | 26.1 | 25.2 | - | - | - | 26.1 | 24.0 | 24.1 | 25.3 | 24.5 | 25.1 |
| Specific Conductivity (μS/cm) | 310.0 | 320.0 | 315.00 | - | - | - | 299.81 | 418.32 | 314.62 | 341.50 | 292.19 | 338.89 |
| pH | 8.4 | 8.5 | 8.4 | - | - | - | 9.2 | 8.6 | 8.5 | 8.5 | 8.5 | 8.3 |
| I (Ionic Strength ?) | 0.0543 | 0.0560 | 0.0551 | - | - | - | 0.0525 | 0.0732 | 0.0551 | 0.0598 | 0.0511 | 0.0593 |
| Dissolved Inorganic Carbon (mM) | 2.79 | 2.96 | 2.88 | - | - | - | 2.35 | 2.74 | 1.94 | 2.76 | 2.93 | 3.06 |
| pCO2 (μatm) | 546 | 470 | 507.8 | - | - | - | 83.4 | 281.4 | 252.0 | 375.4 | 457.2 | 1020.1 |
| Equilibrium CO2 | 12.94 | 12.25 | 12.60 | - | - | - | 12.32 | 13.02 | 13.01 | 12.55 | 13.12 | 12.61 |
| CO2 (μM) | 19.09 | 15.56 | 17.32 | - | - | - | 2.97 | 9.87 | 9.03 | 12.83 | 16.88 | 35.34 |
| Δ CO2 from Equilibrium | 6.149 | 3.301 | 4.72 | - | - | - | -9.35 | -3.15 | -3.99 | 0.27 | 3.75 | 22.73 |