| Report Year: 2012 |
| Trumbull Lake, Clay County |
| Summary Data Table |
| Parameter | 5/29/2012 | 2012 | 2011 | 2010 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 0.7 | 0.7 | 1.1 | 1.1 | 1.1 | 0.9 | 1.0 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 |
| Thermocline Depth (m) | Nil | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.1 | 0.1 | 0.3 | 0.2 | 0.3 | 0.2 | 0.2 | 0.1 | 0.2 | 0.2 | 0.1 | 0.3 | 0.2 |
| Temperature(oC) | 19.0 | 19.0 | 24.6 | 24.2 | 21.7 | 22.9 | 23.2 | 21.5 | 22.1 | 21.2 | 19.5 | 25.9 | 23.5 |
| Dissolved Oxygen (mg/L) | 9.8 | 9.8 | 11.5 | 11.3 | 9.3 | 10.1 | 9.6 | 9.1 | 9.3 | 12.5 | 8.1 | 13.6 | 9.2 |
| Dissolved Oxygen Saturation (%) | 106 | 105.6 | 137.7 | 135.0 | 103.0 | 117.8 | 112.2 | 101.7 | 106.1 | 141.5 | 87.5 | 165.6 | 107.5 |
| Specific Conductivity (μS/cm) | 500.0 | 500.0 | 390.0 | 406.7 | 403.3 | 373.9 | 428.3 | 498.6 | 437.5 | 461.1 | 468.0 | 453.8 | 383.0 |
| Turbidity (NTU) | 218.4 | 218.4 | 86.5 | 141.0 | 82.1 | 65.7 | 191.9 | 163.8 | 351.3 | 71.8 | 933.9 | 137.6 | 880.8 |
| Chlorophyll a (μg/L) | 70.0 | 70.0 | 86.9 | 76.3 | 29.7 | 137.2 | 120.6 | 144.7 | 92.5 | 24.4 | 182.9 | 121.7 | 196.0 |
| Total Phosphorus as P (μg/L) | 253.8 | 253.8 | 235.7 | 170.6 | 160.5 | 234 | 248 | 159 | 153 | 147 | 460 | 271 | - |
| SRP as P (μg/L) | <10 | <10 | <11 | <8 | 23.1 | 2.1 | 29.7 | 30.0 | 3.5 | 1.0 | 12.3 | - | - |
| TKN (mg/L) | 4.3 | 4 | 1 | 2 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.3 | 0.3 | 0.3 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | 1.4 | 4.27 | 2.94 | 3.98 | 2.91 | 4.92 | 5.06 | 6.15 | 3.47 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | <14 | <14 | <145 | <136 | <130 | <26 | 412 | 39 | 77 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | <PQL | <PQL | <PQL | <PQL | <130 | 0 | 16 | 3 | 13 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 8.00 | 8 | 3 | 1 | - | 1.77 | 0.92 | 2.88 | 1.39 | 3.63 | 2.44 | 4.29 | 0.64 |
| TN:TP ratio | - | - | - | - | 8 | 20 | 12 | 32 | 21 | 37 | 12 | 36 | - |
| pH | 8.4 | 8.4 | 8.6 | 8.7 | 8.6 | 8.7 | 8.2 | 8.3 | 8.7 | 8.6 | 8.3 | 8.5 | 8.4 |
| Alkalinity as CaCO3 (mg/L) | 186 | 186 | 159 | 176 | 182 | 159 | 201 | 227 | 160 | 127 | 219 | 176 | 146 |
| Silica as Si (mg/L) | - | - | - | - | - | - | - | 8.85 | 3.13 | 6.39 | 16.31 | - | - |
| Dissolved Organic Carbon (mg/L) | 4.86 | 5 | <7.6 | <6.4 | 7 | 16.52 | 7.53 | 6.25 | 7.37 | 9.58 | 15.25 | - | - |
| Inorganic Suspended Solids (mg/L) | 362 | 362 | 139 | 38 | 30 | 55 | 63 | 83 | 44 | 32 | 178 | 76 | 56 |
| Volatile Suspended Solids (mg/L) | 80 | 80 | 36 | 18 | 13 | 34 | 19 | 22 | 20 | 16 | 41 | 26 | 27 |
| Total Suspended Solids (mg/L) | 442 | 442 | 175 | 56 | 43 | 89 | 82 | 106 | 63 | 49 | 218 | 102 | 83 |
| Carlson Trophic State Index (Secchi)* | 93 | 93 | 78 | 84 | 79 | 83 | 84 | 93 | 81 | 80 | 95 | 77 | 87 |
| Carlson Trophic State Index (Chl a)* | 72 | 72 | 74 | 73 | 64 | 79 | 78 | 79 | 75 | 62 | 82 | 78 | 82 |
| Carlson Trophic State Index (TP)* | 84 | 84 | 83 | 78 | 77 | 83 | 84 | 77 | 77 | 76 | 93 | 85 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |