| Report Year: 2009 |
| Pleasant Creek Lake, Linn County |
| Carbon Balance Table |
| Parameter | 6/23/2009 | 7/28/2009 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Alkalinity as CaCO3 (mg/L) | 150 | 147 | 148.5 | - | 131.0 | 145.1 | 130.0 | 128.3 | 89.2 | 128.8 | 127.8 | 137.0 |
| Dissolved Organic Carbon (mM) | 0.38 | 0.42 | 0.40 | - | 0.46 | 0.45 | 0.55 | 0.38 | 0.66 | 0.72 | - | - |
| Temperature (oC) | 27.4 | 24.6 | 26.0 | - | 24.7 | 24.4 | 26.3 | 24.3 | 23.8 | 25.6 | 24.3 | 25.2 |
| Specific Conductivity (μS/cm) | 320.0 | 300.0 | 310.00 | - | 287.85 | 327.16 | 299.17 | 377.21 | 302.65 | 345.71 | 253.41 | 317.88 |
| pH | 8.6 | 8.3 | 8.4 | - | 8.5 | 8.6 | 9.0 | 8.8 | 8.6 | 8.5 | 8.7 | 8.7 |
| I (Ionic Strength ?) | 0.0560 | 0.0525 | 0.0543 | - | 0.0504 | 0.0573 | 0.0524 | 0.0660 | 0.0530 | 0.0605 | 0.0443 | 0.0556 |
| Dissolved Inorganic Carbon (mM) | 2.90 | 2.90 | 2.90 | - | 2.54 | 2.77 | 2.33 | 2.41 | 1.72 | 2.50 | 2.43 | 2.62 |
| pCO2 (μatm) | 363 | 639 | 501.2 | - | 368.3 | 477.3 | 118.1 | 224.3 | 229.0 | 380.0 | 256.5 | 306.9 |
| Equilibrium CO2 | 11.80 | 12.80 | 12.30 | - | 12.76 | 12.87 | 12.22 | 12.93 | 13.17 | 12.43 | 13.16 | 12.57 |
| CO2 (μM) | 11.58 | 22.12 | 16.85 | - | 12.93 | 16.41 | 4.07 | 8.04 | 8.42 | 12.64 | 9.78 | 10.62 |
| Δ CO2 from Equilibrium | -0.226 | 9.319 | 4.55 | - | 0.16 | 3.54 | -8.15 | -4.88 | -4.75 | 0.21 | -3.37 | -1.95 |