| Report Year: 2009 |
| Lake Wapello, Davis County |
| Summary Data Table |
| Parameter | 7/21/2009 | 6/17/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 8.1 | 7.0 | 7.6 | 9.3 | 9.3 | 9.1 | 9.2 | 9.0 | 9.1 | 8.9 | 9.4 |
| Thermocline Depth (m) | 3.7 | 2.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.5 | 1.7 | 1.6 | 1.2 | 3.5 | 2.7 | 2.4 | 2.6 | 0.9 | 1.5 | 3.4 |
| Temperature(oC) | 24.2 | 23.6 | 23.9 | 26.6 | 25.4 | 27.9 | 23.9 | 24.8 | 26.0 | 24.1 | 26.1 |
| Dissolved Oxygen (mg/L) | 7.4 | 8.8 | 8.1 | 8.3 | 7.7 | 9.4 | 7.7 | 8.9 | 8.0 | 9.4 | 8.8 |
| Dissolved Oxygen Saturation (%) | 89 | 103 | 96.1 | 103.4 | 93.9 | 119.5 | 91.5 | 107.7 | 97.9 | 113.7 | 108.9 |
| Specific Conductivity (μS/cm) | 220.0 | 220.0 | 220.0 | 205.2 | 238.8 | 209.8 | 228.4 | 222.2 | 349.9 | 187.9 | 212.0 |
| Turbidity (NTU) | 4.3 | 12.7 | 8.5 | 12.6 | 3.7 | 23.2 | 14.2 | 4.3 | 12.2 | 14.0 | 14.9 |
| Chlorophyll a (μg/L) | 5.0 | 5.0 | 5.0 | 29.7 | 17.8 | 20.5 | 3.9 | 14.9 | 19.7 | 36.4 | 1.0 |
| Total Phosphorus as P (μg/L) | 40 | 73 | 57 | 43 | 19 | 24 | 36 | 28 | 104 | 54 | 113 |
| SRP as P (μg/L) | - | 5 | 5 | 1 | - | 1 | 8 | 4 | 55 | - | - |
| Total Nitrogen as N (mg/L) | 0.79 | 1.00 | 0.90 | 1.04 | 0.68 | 0.79 | 1.27 | 0.68 | 0.97 | 0.96 | 0.84 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 35 | 62 | 49 | 16 | 16 | 37 | 48 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 2.2 | 1.9 | 2.1 | 3.1 | 1.2 | 5.9 | 2.5 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.27 | 0.17 | 0.12 | 0.12 | 0.14 | 0.16 | 0.12 | 0.14 | 0.19 | 0.23 |
| TN:TP ratio | 20 | 14 | 17 | 26 | 44 | 33 | 39 | 27 | 13 | 26 | 9 |
| pH | 8.1 | 7.8 | 8.0 | 8.9 | 8.3 | 8.7 | 8.0 | 8.4 | 8.0 | 8.5 | 7.6 |
| Alkalinity as CaCO3 (mg/L) | 84 | 79 | 82 | 92 | 100 | 90 | 81 | 60 | 91 | 73 | 131 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.13 | 3.83 | 1.84 | 4.12 | - | - |
| Dissolved Organic Carbon (mg/L) | 7.48 | 7.69 | 7.59 | 8.18 | 6.67 | 7.93 | 5.50 | 9.10 | 11.49 | - | - |
| Inorganic Suspended Solids (mg/L) | 2 | 1 | 1 | 2 | 3 | 3 | 5 | 2 | 4 | 5 | 1 |
| Volatile Suspended Solids (mg/L) | 3 | 2 | 3 | 7 | 4 | 6 | 2 | 3 | 5 | 4 | 1 |
| Total Suspended Solids (mg/L) | 5 | 3 | 4 | 9 | 5 | 9 | 6 | 5 | 9 | 9 | 2 |
| Carlson Trophic State Index (Secchi)* | 54 | 53 | 53 | 58 | 42 | 46 | 48 | 46 | 61 | 54 | 43 |
| Carlson Trophic State Index (Chl a)* | 46 | 46 | 46 | 64 | 59 | 60 | 44 | 57 | 60 | 66 | 31 |
| Carlson Trophic State Index (TP)* | 57 | 66 | 62 | 58 | 47 | 50 | 56 | 52 | 71 | 62 | 72 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |