| Report Year: 2009 |
| Hickory Grove Lake, Story County |
| Carbon Balance Table |
| Parameter | 6/15/2009 | 7/20/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 174 | 177 | 175.5 | - | 143.6 | 176.7 | 188.8 | 118.3 | 95.0 | 156.5 | 144.3 | 161.0 |
| Dissolved Organic Carbon (mM) | 0.34 | 0.30 | 0.32 | - | 0.35 | 0.29 | 0.29 | 0.34 | 0.64 | 0.76 | - | - |
| Temperature (oC) | 21.1 | 22.8 | 21.9 | - | 25.0 | 25.2 | 24.3 | 21.7 | 23.5 | 26.0 | 22.2 | 24.2 |
| Specific Conductivity (μS/cm) | 410.0 | 430.0 | 420.00 | - | 402.99 | 512.34 | 521.81 | 360.06 | 438.22 | 470.58 | 435.88 | 407.48 |
| pH | 8.6 | 8.4 | 8.5 | - | 8.0 | 7.8 | 8.3 | 8.3 | 7.8 | 8.1 | 7.3 | 8.6 |
| I (Ionic Strength ?) | 0.0718 | 0.0753 | 0.0735 | - | 0.0705 | 0.0897 | 0.0913 | 0.0630 | 0.0767 | 0.0773 | 0.0763 | 0.0713 |
| Dissolved Inorganic Carbon (mM) | 3.36 | 3.46 | 3.41 | - | 2.88 | 3.57 | 3.70 | 2.32 | 1.93 | 2.72 | 3.18 | 3.45 |
| pCO2 (μatm) | 379 | 597 | 488.0 | - | 3875.1 | 2197.5 | 1063.6 | 807.7 | 1648.3 | 1046.1 | 8868.1 | 430.5 |
| Equilibrium CO2 | 14.20 | 13.48 | 13.84 | - | 12.78 | 12.60 | 13.00 | 14.00 | 13.33 | 11.72 | 13.90 | 12.94 |
| CO2 (μM) | 14.53 | 21.76 | 18.15 | - | 133.23 | 74.87 | 37.44 | 32.50 | 58.71 | 33.37 | 306.51 | 15.17 |
| Δ CO2 from Equilibrium | 0.331 | 8.284 | 4.31 | - | 120.46 | 62.27 | 24.44 | 18.50 | 45.38 | 21.64 | 292.61 | 2.23 |