| Report Year: 2009 |
| Arrowhead Lake (Sac), Sac County |
| Carbon Balance Table |
| Parameter | 6/1/2009 | 7/6/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 288 | 210 | 249.0 | - | 202.3 | 190.0 | 187.3 | 189.7 | 138.5 | 166.0 | 149.0 | 183.7 |
| Dissolved Organic Carbon (mM) | 0.38 | 0.40 | 0.39 | - | 0.50 | 0.55 | 0.58 | 0.43 | 0.77 | - | - | - |
| Temperature (oC) | 20.5 | 24.0 | 22.2 | - | 24.5 | 25.0 | 23.1 | 22.7 | 22.9 | 22.7 | 22.7 | 25.2 |
| Specific Conductivity (μS/cm) | 520.0 | 480.0 | 500.00 | - | 488.23 | 495.11 | 490.70 | 488.01 | 451.78 | 464.20 | 545.41 | 629.64 |
| pH | 8.1 | 8.3 | 8.2 | - | 8.0 | 8.3 | 8.3 | 8.3 | 8.0 | 8.0 | 7.9 | 7.9 |
| I (Ionic Strength ?) | 0.0910 | 0.0840 | 0.0875 | - | 0.0854 | 0.0866 | 0.0859 | 0.0854 | 0.0791 | 0.0812 | 0.0954 | 0.1102 |
| Dissolved Inorganic Carbon (mM) | 5.76 | 4.13 | 4.95 | - | 4.05 | 3.71 | 3.67 | 3.74 | 2.82 | 3.36 | 3.02 | 3.84 |
| pCO2 (μatm) | 2088 | 895 | 1491.5 | - | 2082.1 | 1029.6 | 844.9 | 1013.0 | 2308.2 | 3597.3 | 2860.5 | 4124.9 |
| Equilibrium CO2 | 14.45 | 13.03 | 13.74 | - | 12.90 | 12.67 | 13.48 | 13.66 | 13.55 | 13.74 | 13.63 | 12.59 |
| CO2 (μM) | 81.54 | 31.50 | 56.52 | - | 73.09 | 34.64 | 31.00 | 35.39 | 91.68 | 114.83 | 95.68 | 133.12 |
| Δ CO2 from Equilibrium | 67.093 | 18.474 | 42.78 | - | 60.19 | 21.97 | 17.52 | 21.73 | 78.13 | 101.09 | 82.05 | 120.52 |