| Report Year: 2009 |
| Big Creek Lake, Polk 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) | 253 | 231 | 242.0 | - | 157.2 | 179.8 | 210.5 | 152.6 | 118.3 | 151.8 | 162.0 | 163.7 |
| Dissolved Organic Carbon (mM) | 0.23 | 0.25 | 0.24 | - | 0.29 | 0.28 | 0.31 | 0.29 | 0.63 | 0.71 | - | - |
| Temperature (oC) | 17.4 | 19.2 | 18.3 | - | 24.3 | 25.1 | 24.6 | 21.8 | 23.4 | 24.7 | 21.9 | 24.7 |
| Specific Conductivity (μS/cm) | 600.0 | 610.0 | 605.00 | - | 441.52 | 517.99 | 571.27 | 459.66 | 518.91 | 458.40 | 446.68 | 345.55 |
| pH | 8.0 | 7.9 | 7.9 | - | 8.0 | 8.3 | 8.2 | 8.4 | 8.4 | 7.9 | 7.1 | 8.3 |
| I (Ionic Strength ?) | 0.1050 | 0.1068 | 0.1059 | - | 0.0773 | 0.0906 | 0.1000 | 0.0804 | 0.0908 | 0.0802 | 0.0782 | 0.0605 |
| Dissolved Inorganic Carbon (mM) | 5.08 | 4.69 | 4.88 | - | 3.16 | 3.51 | 4.14 | 2.98 | 2.27 | 3.40 | 3.77 | 3.23 |
| pCO2 (μatm) | 1921 | 2755 | 2337.9 | - | 1614.8 | 1332.0 | 1553.7 | 513.7 | 840.9 | 11182.0 | 14879.0 | 799.7 |
| Equilibrium CO2 | 15.90 | 15.05 | 15.47 | - | 13.16 | 12.62 | 12.84 | 13.91 | 13.38 | 12.83 | 13.97 | 12.76 |
| CO2 (μM) | 82.57 | 112.03 | 97.30 | - | 64.78 | 44.48 | 52.14 | 19.10 | 28.81 | 437.10 | 538.60 | 27.56 |
| Δ CO2 from Equilibrium | 66.666 | 96.978 | 81.82 | - | 51.61 | 31.86 | 39.29 | 5.19 | 15.43 | 424.27 | 524.63 | 14.81 |