| Report Year: 2009 |
| Bob White Lake, Wayne County |
| Summary Data Table |
| Parameter | 7/22/2009 | 6/17/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.3 | 3.5 | 3.5 | 3.6 | 3.8 | 3.6 |
| Thermocline Depth (m) | Nil | 0.7 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.2 | 0.3 | 0.2 | 0.2 | 0.3 |
| Temperature(oC) | 22.6 | 27.2 | 24.9 | 27.0 | 25.7 | 26.6 | 23.4 | 26.4 | 26.3 | 24.1 | 23.8 |
| Dissolved Oxygen (mg/L) | 6.5 | 6.9 | 6.7 | 10.4 | 6.1 | 8.0 | 8.2 | 8.4 | 6.6 | 7.9 | 7.4 |
| Dissolved Oxygen Saturation (%) | 75 | 87 | 80.8 | 131.9 | 74.9 | 99.9 | 97.7 | 104.1 | 82.1 | 93.6 | 87.7 |
| Specific Conductivity (μS/cm) | 210.0 | 230.0 | 220.0 | 235.3 | 363.2 | 311.0 | 208.1 | 317.5 | 423.7 | 171.2 | 189.9 |
| Turbidity (NTU) | 46.8 | 60.8 | 53.8 | 83.4 | 94.9 | 238.7 | 207.5 | 46.6 | 97.5 | 154.0 | 44.2 |
| Chlorophyll a (μg/L) | 9.0 | 3.0 | 6.0 | 49.6 | 41.6 | 159.1 | 48.1 | 23.0 | 9.5 | 16.6 | 10.6 |
| Total Phosphorus as P (μg/L) | 171 | 264 | 217 | 247 | 181 | 197 | 182 | 149 | 165 | 358 | 376 |
| SRP as P (μg/L) | 27 | 87 | 57 | 74 | 35 | 47 | 60 | 38 | 80 | - | - |
| Total Nitrogen as N (mg/L) | 1.77 | 4.16 | 2.97 | 5.20 | 1.47 | 1.54 | 1.35 | 1.29 | 3.13 | 3.47 | 1.77 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 117 | 56 | 87 | 372 | 95 | 163 | 33 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 3.4 | 1.8 | 2.6 | 12.8 | 4.8 | 8.0 | 8.6 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.44 | 3.17 | 1.81 | 3.63 | 0.12 | 0.46 | 0.37 | 0.17 | 2.22 | 2.66 | 0.54 |
| TN:TP ratio | 10 | 16 | 13 | 24 | 8 | 8 | 20 | 9 | 18 | 9 | 5 |
| pH | 7.8 | 7.7 | 7.8 | 8.3 | 7.9 | 7.9 | 8.4 | 8.0 | 7.8 | 7.6 | 7.2 |
| Alkalinity as CaCO3 (mg/L) | 80 | 74 | 77 | 72 | 119 | 104 | 85 | 75 | 86 | 76 | 112 |
| Silica as Si (mg/L) | - | - | - | - | - | 4.62 | 6.94 | 6.89 | 10.54 | - | - |
| Dissolved Organic Carbon (mg/L) | 7.69 | 7.58 | 7.64 | 7.70 | 9.63 | 6.51 | 8.16 | 11.60 | 11.32 | - | - |
| Inorganic Suspended Solids (mg/L) | 37 | 7 | 22 | 30 | 20 | 24 | 41 | 23 | 17 | 43 | 18 |
| Volatile Suspended Solids (mg/L) | 5 | 4 | 4 | 12 | 10 | 14 | 14 | 19 | 8 | 6 | 5 |
| Total Suspended Solids (mg/L) | 41 | 11 | 26 | 41 | 30 | 38 | 55 | 41 | 25 | 49 | 22 |
| Carlson Trophic State Index (Secchi)* | 83 | 83 | 83 | 80 | 75 | 80 | 82 | 76 | 82 | 82 | 77 |
| Carlson Trophic State Index (Chl a)* | 52 | 41 | 48 | 69 | 67 | 80 | 69 | 61 | 53 | 58 | 54 |
| Carlson Trophic State Index (TP)* | 78 | 85 | 82 | 84 | 79 | 80 | 79 | 76 | 78 | 89 | 90 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |