| Report Year: 2009 |
| Diamond Lake, Poweshiek County |
| Carbon Balance Table |
| Parameter | 7/20/2009 | 6/16/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 127 | 142 | 134.5 | - | 110.2 | 117.5 | 130.7 | 108.8 | 83.5 | 102.7 | 130.0 | 183.3 |
| Dissolved Organic Carbon (mM) | 0.37 | 0.41 | 0.39 | - | 0.46 | 0.56 | 0.42 | 0.39 | 0.80 | 0.81 | - | - |
| Temperature (oC) | 25.6 | 22.3 | 24.0 | - | 26.7 | 26.4 | 25.7 | 23.4 | 24.9 | 26.5 | 23.5 | 25.8 |
| Specific Conductivity (μS/cm) | 300.0 | 330.0 | 315.00 | - | 293.23 | 345.49 | 338.58 | 315.15 | 287.99 | 309.54 | 303.88 | 261.88 |
| pH | 8.6 | 8.7 | 8.7 | - | 8.4 | 8.6 | 9.1 | 8.7 | 8.7 | 8.4 | 8.7 | 8.9 |
| I (Ionic Strength ?) | 0.0525 | 0.0578 | 0.0551 | - | 0.0513 | 0.0605 | 0.0593 | 0.0552 | 0.0524 | 0.0540 | 0.0532 | 0.0458 |
| Dissolved Inorganic Carbon (mM) | 2.45 | 2.70 | 2.57 | - | 2.14 | 2.24 | 2.29 | 2.04 | 1.68 | 1.90 | 2.47 | 3.33 |
| pCO2 (μatm) | 280 | 212 | 246.0 | - | 463.0 | 247.0 | 122.2 | 333.0 | 144.7 | 573.6 | 219.0 | 185.8 |
| Equilibrium CO2 | 12.42 | 13.70 | 13.06 | - | 12.11 | 12.16 | 12.46 | 13.27 | 13.54 | 11.67 | 13.25 | 12.36 |
| CO2 (μM) | 9.39 | 7.85 | 8.62 | - | 15.81 | 8.21 | 4.27 | 11.59 | 5.19 | 18.66 | 8.03 | 6.11 |
| Δ CO2 from Equilibrium | -3.028 | -5.843 | -4.44 | - | 3.71 | -3.95 | -8.18 | -1.68 | -8.35 | 7.00 | -5.22 | -6.25 |