| Report Year: 2009 |
| Carter Lake, Pottawattamie County |
| Carbon Balance Table |
| Parameter | 6/9/2009 | 7/14/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 218 | 209 | 213.5 | - | 191.3 | 181.7 | 192.8 | 195.7 | 148.0 | 193.8 | 198.0 | 216.3 |
| Dissolved Organic Carbon (mM) | 0.64 | 0.49 | 0.56 | - | 0.60 | 0.97 | 0.26 | 0.53 | 0.95 | 0.84 | - | - |
| Temperature (oC) | 21.2 | 25.8 | 23.5 | - | 26.5 | 26.3 | 24.2 | 23.8 | 25.2 | 26.2 | 24.2 | 25.8 |
| Specific Conductivity (μS/cm) | 720.0 | 730.0 | 725.00 | - | 665.72 | 797.94 | 740.70 | 681.20 | 681.20 | 650.20 | 605.70 | 693.18 |
| pH | 8.4 | 8.1 | 8.2 | - | 8.3 | 9.3 | 8.3 | 8.5 | 8.7 | 8.5 | 8.5 | 8.3 |
| I (Ionic Strength ?) | 0.1260 | 0.1278 | 0.1269 | - | 0.1165 | 0.1396 | 0.1296 | 0.1192 | 0.1192 | 0.1138 | 0.1060 | 0.1213 |
| Dissolved Inorganic Carbon (mM) | 4.24 | 4.16 | 4.20 | - | 3.73 | 2.95 | 3.76 | 3.74 | 2.79 | 3.67 | 3.73 | 4.22 |
| pCO2 (μatm) | 645 | 1519 | 1082.2 | - | 877.1 | 55.6 | 870.9 | 500.2 | 273.3 | 784.7 | 925.4 | 870.1 |
| Equilibrium CO2 | 14.13 | 12.35 | 13.24 | - | 12.17 | 12.20 | 13.01 | 13.11 | 12.60 | 12.26 | 13.12 | 12.38 |
| CO2 (μM) | 24.65 | 50.72 | 37.68 | - | 28.14 | 1.86 | 31.20 | 17.62 | 9.20 | 28.04 | 33.40 | 29.67 |
| Δ CO2 from Equilibrium | 10.516 | 38.363 | 24.44 | - | 15.97 | -10.34 | 18.19 | 4.50 | -3.40 | 15.78 | 20.28 | 17.29 |