| Report Year: 2009 |
| Big Spirit Lake, Dickinson County |
| Carbon Balance Table |
| Parameter | 7/7/2009 | 6/3/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 185 | 243 | 214.0 | - | 179.1 | 193.8 | 177.8 | 168.5 | 128.7 | 165.5 | 130.7 | 182.0 |
| Dissolved Organic Carbon (mM) | 0.51 | 0.53 | 0.52 | - | 1.75 | 0.64 | 0.68 | 0.66 | 0.77 | 0.75 | - | - |
| Temperature (oC) | 23.4 | 17.7 | 20.6 | - | 22.9 | 20.5 | 21.2 | 20.8 | 20.8 | 21.2 | 20.7 | 23.8 |
| Specific Conductivity (μS/cm) | 480.0 | 460.0 | 470.00 | - | 464.06 | 503.55 | 488.42 | 491.45 | 462.71 | 579.96 | 547.10 | 485.58 |
| pH | 8.5 | 8.5 | 8.5 | - | 8.3 | 8.8 | 8.8 | 8.8 | 8.8 | 8.2 | 8.6 | 8.6 |
| I (Ionic Strength ?) | 0.0840 | 0.0805 | 0.0823 | - | 0.0812 | 0.0881 | 0.0855 | 0.0860 | 0.0810 | 0.1103 | 0.0957 | 0.0850 |
| Dissolved Inorganic Carbon (mM) | 3.58 | 4.74 | 4.16 | - | 3.53 | 3.65 | 3.33 | 3.18 | 2.43 | 3.30 | 2.48 | 3.35 |
| pCO2 (μatm) | 484 | 647 | 565.4 | - | 840.4 | 247.9 | 232.1 | 228.5 | 167.8 | 888.2 | 233.9 | 344.9 |
| Equilibrium CO2 | 13.25 | 15.72 | 14.49 | - | 13.55 | 14.61 | 14.30 | 14.50 | 14.47 | 13.49 | 14.49 | 13.51 |
| CO2 (μM) | 17.33 | 27.48 | 22.41 | - | 31.84 | 9.83 | 9.11 | 9.14 | 6.71 | 33.47 | 9.12 | 12.61 |
| Δ CO2 from Equilibrium | 4.084 | 11.756 | 7.92 | - | 18.29 | -4.78 | -5.19 | -5.36 | -7.76 | 19.98 | -5.37 | -0.90 |