| Report Year: 2009 |
| Coralville Reservoir, Johnson 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) | 237 | 178 | 207.5 | - | 194.3 | 193.8 | 236.3 | 203.2 | 165.5 | 181.7 | 197.0 | 193.3 |
| Dissolved Organic Carbon (mM) | 0.25 | 0.29 | 0.27 | - | 0.32 | 0.31 | 0.35 | 0.31 | 0.55 | 0.58 | - | - |
| Temperature (oC) | 24.2 | 24.7 | 24.5 | - | 25.9 | 26.1 | 26.8 | 23.2 | 24.4 | 26.0 | 24.3 | 25.2 |
| Specific Conductivity (μS/cm) | 640.0 | 470.0 | 555.00 | - | 529.02 | 529.20 | 617.93 | 530.12 | 599.13 | 636.06 | 582.06 | 535.71 |
| pH | 8.0 | 7.8 | 7.9 | - | 8.1 | 8.4 | 8.5 | 8.1 | 8.4 | 8.2 | 8.3 | 8.1 |
| I (Ionic Strength ?) | 0.1120 | 0.0823 | 0.0971 | - | 0.0926 | 0.0926 | 0.1081 | 0.0928 | 0.1088 | 0.1113 | 0.1019 | 0.0937 |
| Dissolved Inorganic Carbon (mM) | 4.75 | 3.61 | 4.18 | - | 3.88 | 3.69 | 4.53 | 4.05 | 3.22 | 3.59 | 3.86 | 3.85 |
| pCO2 (μatm) | 2154 | 2315 | 2234.4 | - | 1730.5 | 912.5 | 789.1 | 2258.9 | 710.1 | 1072.9 | 742.4 | 1341.1 |
| Equilibrium CO2 | 12.93 | 12.74 | 12.83 | - | 12.34 | 12.28 | 12.03 | 13.33 | 12.16 | 12.32 | 13.21 | 12.59 |
| CO2 (μM) | 75.24 | 79.72 | 77.48 | - | 59.45 | 29.04 | 26.43 | 81.80 | 23.43 | 35.99 | 25.86 | 45.68 |
| Δ CO2 from Equilibrium | 62.315 | 66.981 | 64.65 | - | 47.12 | 16.76 | 14.39 | 68.48 | 11.27 | 23.66 | 12.65 | 33.10 |