| Report Year: 2009 |
| Lake Manawa, Pottawattamie County |
| Carbon Balance Table |
| Parameter | 6/9/2009 | 7/14/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 198 | 188 | 193.0 | - | 173.6 | 195.0 | 181.3 | 187.8 | 136.0 | 188.0 | 179.3 | 182.0 |
| Dissolved Organic Carbon (mM) | 0.45 | 0.37 | 0.41 | - | 0.37 | 0.45 | 0.32 | 0.40 | 0.70 | 0.58 | - | - |
| Temperature (oC) | 21.3 | 27.3 | 24.3 | - | 26.2 | 26.7 | 25.4 | 23.8 | 26.1 | 26.6 | 24.3 | 26.0 |
| Specific Conductivity (μS/cm) | 490.0 | 470.0 | 480.00 | - | 412.42 | 505.70 | 465.72 | 493.83 | 498.99 | 493.14 | 455.81 | 462.09 |
| pH | 8.6 | 8.5 | 8.5 | - | 8.5 | 8.8 | 8.8 | 8.5 | 8.7 | 8.6 | 8.8 | 8.6 |
| I (Ionic Strength ?) | 0.0858 | 0.0823 | 0.0840 | - | 0.0722 | 0.0885 | 0.0815 | 0.0864 | 0.0873 | 0.0863 | 0.0798 | 0.0809 |
| Dissolved Inorganic Carbon (mM) | 3.82 | 3.65 | 3.73 | - | 3.34 | 3.58 | 3.35 | 3.63 | 2.56 | 3.61 | 3.31 | 3.48 |
| pCO2 (μatm) | 433 | 560 | 496.5 | - | 503.8 | 327.5 | 283.3 | 635.4 | 239.8 | 436.6 | 368.4 | 350.9 |
| Equilibrium CO2 | 14.10 | 11.86 | 12.98 | - | 12.28 | 12.08 | 12.55 | 13.14 | 12.28 | 12.12 | 13.14 | 12.32 |
| CO2 (μM) | 16.52 | 17.93 | 17.22 | - | 16.34 | 10.87 | 10.04 | 21.76 | 7.86 | 14.53 | 14.22 | 11.64 |
| Δ CO2 from Equilibrium | 2.418 | 6.073 | 4.25 | - | 4.06 | -1.21 | -2.51 | 8.62 | -4.42 | 2.40 | 1.08 | -0.68 |