| Report Year: 2009 |
| Pierce Creek Lake, Page 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) | 147 | 145 | 146.0 | - | - | - | 152.0 | 134.2 | 108.0 | 141.0 | 141.0 | 148.0 |
| Dissolved Organic Carbon (mM) | 0.46 | 0.38 | 0.42 | - | - | - | 0.22 | 0.40 | 0.69 | 0.67 | - | - |
| Temperature (oC) | 21.0 | 25.9 | 23.5 | - | - | - | 24.2 | 22.2 | 25.7 | 25.2 | 23.0 | 26.0 |
| Specific Conductivity (μS/cm) | 310.0 | 310.0 | 310.00 | - | - | - | 335.47 | 307.25 | 333.57 | 313.17 | 320.37 | 329.82 |
| pH | 7.7 | 8.2 | 8.0 | - | - | - | 8.5 | 8.1 | 8.6 | 8.4 | 8.4 | 8.3 |
| I (Ionic Strength ?) | 0.0543 | 0.0543 | 0.0543 | - | - | - | 0.0587 | 0.0538 | 0.0584 | 0.0548 | 0.0561 | 0.0577 |
| Dissolved Inorganic Carbon (mM) | 3.02 | 2.87 | 2.94 | - | - | - | 2.96 | 2.68 | 2.06 | 2.75 | 2.74 | 2.91 |
| pCO2 (μatm) | 2475 | 763 | 1618.9 | - | - | - | 464.9 | 1244.6 | 366.6 | 498.0 | 736.1 | 982.2 |
| Equilibrium CO2 | 14.23 | 12.32 | 13.28 | - | - | - | 12.98 | 13.74 | 12.43 | 12.60 | 13.63 | 12.31 |
| CO2 (μM) | 95.21 | 25.40 | 60.30 | - | - | - | 16.57 | 44.40 | 12.13 | 16.57 | 29.24 | 33.08 |
| Δ CO2 from Equilibrium | 80.974 | 13.084 | 47.03 | - | - | - | 3.59 | 30.66 | -0.30 | 3.97 | 15.61 | 20.77 |