| Report Year: 2011 |
| Three Mile Lake, Union County |
| Summary Data Table |
| Parameter | 6/13/2011 | 8/1/2011 | 9/12/2011 | 2011 | 2010 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 9.4 | 13.3 | 10.8 | 11.2 | 13.0 | 11.6 | 13.5 | 12.2 | 15.1 | 13.9 | 14.1 | 14.0 | 13.4 | 12.3 |
| Thermocline Depth (m) | 7.2 | 2.8 | 8.5 | 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) | 0.7 | 0.7 | 0.9 | 0.8 | 0.9 | 1.1 | 1.2 | 1.2 | 1.4 | 1.6 | 1.8 | 2.1 | 2.5 | 1.7 |
| Temperature(oC) | 20.8 | 29.1 | 22.9 | 24.3 | 23.8 | 20.6 | 23.2 | 24.2 | 22.9 | 22.5 | 22.4 | 22.8 | 22.5 | 24.6 |
| Dissolved Oxygen (mg/L) | 6.3 | 8.2 | 7.1 | 7.2 | 6.4 | 4.8 | 6.9 | 8.0 | 7.0 | 10.4 | 8.1 | 8.3 | 7.8 | 6.2 |
| Dissolved Oxygen Saturation (%) | 71 | 107 | 82 | 86.6 | 75.6 | 53.7 | 79.7 | 94.3 | 81.4 | 121.1 | 90.3 | 96.3 | 90.6 | 74.6 |
| Specific Conductivity (μS/cm) | 260.0 | 220.0 | 240.0 | 240.0 | 253.3 | 263.3 | 268.9 | 311.9 | 300.8 | 385.9 | 306.2 | 286.4 | 267.2 | 302.0 |
| Turbidity (NTU) | 12.1 | 19.6 | 14.9 | 15.5 | 9.1 | 8.4 | 7.5 | 8.3 | 8.5 | 8.9 | 12.6 | 6.8 | 3.9 | 6.3 |
| Chlorophyll a (μg/L) | 11.7 | 38.9 | 50.0 | 33.5 | 23.7 | 17.3 | 13.3 | 23.2 | 34.5 | 21.7 | 16.3 | 8.5 | 9.9 | 8.2 |
| Total Phosphorus as P (μg/L) | 30.7 | 39.2 | 36.3 | 35.4 | 37.1 | 38.2 | 33 | 27 | 36 | 37 | 45 | 48 | 46 | - |
| SRP as P (μg/L) | <11 | <11 | <11 | <11 | <8 | <9 | <1 | <1 | <1 | 1.0 | 1.2 | <1 | - | - |
| TKN (mg/L) | 1.8 | 1.1 | <0.5 | 1 | <0.5 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.2 | 0.1 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | - | 1.2 | 2.13 | 1.17 | 1.32 | 1.20 | 1.13 | 1.00 | 1.70 | 1.18 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 179.24 | <145 | <145 | <145 | <136 | <130 | <26 | <26 | 64 | 43 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 4 | <PQL | <PQL | <PQL | <PQL | <130 | -1 | 0 | 5 | 3 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 1.35 | <0.4 | <0.4 | 0 | <0.5 | - | 1.29 | 0.23 | 0.52 | 0.34 | 0.30 | 0.14 | 0.90 | 0.14 |
| TN:TP ratio | - | - | - | - | - | 34 | 63 | 46 | 42 | 37 | 28 | 23 | 40 | - |
| pH | 7.8 | 8.8 | 8.2 | 8.2 | 8.4 | 8.7 | 8.5 | 8.3 | 8.2 | 8.4 | 8.2 | 8.1 | 7.8 | 7.3 |
| Alkalinity as CaCO3 (mg/L) | 106 | 92 | 80 | 93 | 104 | 108 | 112 | 130 | 124 | 120 | 101 | 128 | 96 | 136 |
| Silica as Si (mg/L) | - | - | - | - | - | - | - | - | 2.08 | 2.02 | 1.59 | 1.73 | - | - |
| Dissolved Organic Carbon (mg/L) | <7.6 | <7.6 | <7.6 | <7.6 | <6.4 | <6.2 | 6.34 | 4.92 | 7.62 | 7.17 | 10.35 | 7.74 | - | - |
| Inorganic Suspended Solids (mg/L) | 6 | <5 | <5 | <5 | <4 | <4 | 3 | 5 | 4 | 2 | 4 | 2 | 2 | 3 |
| Volatile Suspended Solids (mg/L) | <8 | 11 | <8 | <8 | <9 | <8 | 5 | 6 | 5 | 5 | 4 | 4 | 2 | 2 |
| Total Suspended Solids (mg/L) | 10 | 14 | <6 | 9 | 9 | 8 | 8 | 9 | 6 | 7 | 8 | 6 | 4 | 5 |
| Carlson Trophic State Index (Secchi)* | 65 | 65 | 62 | 64 | 61 | 59 | 57 | 58 | 55 | 53 | 51 | 49 | 47 | 52 |
| Carlson Trophic State Index (Chl a)* | 55 | 67 | 69 | 65 | 62 | 59 | 56 | 61 | 65 | 61 | 58 | 52 | 53 | 51 |
| Carlson Trophic State Index (TP)* | 54 | 57 | 56 | 56 | 56 | 57 | 55 | 52 | 56 | 56 | 59 | 60 | 59 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |