| Report Year: 2009 |
| East Okoboji Lake, Dickinson County |
| Carbon Balance Table |
| Parameter | 7/8/2009 | 6/3/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 201 | 216 | 208.5 | - | 199.7 | 207.7 | 202.1 | 215.2 | 156.7 | 194.2 | 141.0 | 204.7 |
| Dissolved Organic Carbon (mM) | 0.50 | 0.52 | 0.51 | - | 0.56 | 0.57 | 0.43 | 0.79 | 0.81 | 0.78 | - | - |
| Temperature (oC) | 23.9 | 18.5 | 21.2 | - | 22.5 | 21.5 | 20.3 | 21.4 | 21.3 | 20.4 | 21.8 | 24.4 |
| Specific Conductivity (μS/cm) | 510.0 | 490.0 | 500.00 | - | 496.35 | 514.56 | 530.52 | 559.59 | 518.20 | 528.92 | 506.56 | 624.47 |
| pH | 8.0 | 8.4 | 8.2 | - | 8.3 | 8.7 | 8.6 | 8.6 | 8.5 | 8.4 | 8.5 | 8.7 |
| I (Ionic Strength ?) | 0.0893 | 0.0858 | 0.0875 | - | 0.0869 | 0.0900 | 0.0928 | 0.0979 | 0.0907 | 0.0926 | 0.0886 | 0.1093 |
| Dissolved Inorganic Carbon (mM) | 4.04 | 4.23 | 4.13 | - | 3.92 | 3.91 | 3.90 | 4.13 | 3.04 | 3.81 | 2.70 | 3.87 |
| pCO2 (μatm) | 1865 | 695 | 1280.0 | - | 1013.7 | 357.9 | 447.2 | 437.3 | 422.7 | 767.5 | 325.5 | 330.0 |
| Equilibrium CO2 | 13.06 | 15.38 | 14.22 | - | 13.68 | 14.11 | 14.75 | 14.22 | 14.27 | 14.69 | 13.99 | 12.93 |
| CO2 (μM) | 65.82 | 28.88 | 47.35 | - | 38.19 | 12.80 | 17.37 | 16.64 | 16.15 | 29.00 | 12.41 | 11.50 |
| Δ CO2 from Equilibrium | 52.766 | 13.508 | 33.14 | - | 24.51 | -1.32 | 2.62 | 2.42 | 1.89 | 14.31 | -1.58 | -1.43 |