| Report Year: 2011 |
| Greenfield Lake, Adair 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) | 6.5 | 6.0 | 6.2 | 6.2 | 6.3 | 6.0 | - | - | 6.7 | 6.7 | 6.5 | 6.3 | 7.1 | 5.0 |
| Thermocline Depth (m) | Nil | 2.5 | Nil | 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) | 1.2 | 0.7 | 1.2 | 1.0 | 0.7 | 0.9 | - | - | 2.3 | 1.2 | 2.0 | 1.2 | 1.6 | 0.9 |
| Temperature(oC) | 21.6 | 30.0 | 22.5 | 24.7 | 24.2 | 23.4 | - | - | 24.1 | 22.5 | 22.9 | 26.6 | 24.3 | 25.5 |
| Dissolved Oxygen (mg/L) | 5.6 | 13.4 | 7.7 | 8.9 | 7.2 | 9.3 | - | - | 7.5 | 9.2 | 9.3 | 6.8 | 10.6 | 9.8 |
| Dissolved Oxygen Saturation (%) | 64 | 177 | 89 | 109.7 | 84.9 | 109.3 | - | - | 89.2 | 105.7 | 107.1 | 84.7 | 131.0 | 119.9 |
| Specific Conductivity (μS/cm) | 350.0 | 270.0 | 270.0 | 296.7 | 303.3 | 303.3 | - | - | 343.3 | 378.3 | 344.8 | 374.4 | 324.5 | 348.1 |
| Turbidity (NTU) | 7.4 | 12.6 | 5.4 | 8.5 | 7.5 | 7.0 | - | - | 9.8 | 10.4 | 4.8 | 4.5 | 7.0 | 21.3 |
| Chlorophyll a (μg/L) | 17.9 | 67.6 | 10.3 | 31.9 | 25.9 | 39.7 | - | - | 34.6 | 73.3 | 14.2 | 15.2 | 18.7 | 19.5 |
| Total Phosphorus as P (μg/L) | 82.4 | 95.3 | 41.3 | 73.0 | 81.8 | 81.8 | - | - | 122 | 69 | 83 | 162 | 71 | - |
| SRP as P (μg/L) | 27.2 | <11 | <11 | <11 | <8 | <9 | - | - | <1 | 1.7 | 14.7 | 9.0 | - | - |
| TKN (mg/L) | 1.5 | 1.5 | <0.5 | 1 | 1 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.2 | 0.2 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | - | 0.9 | - | - | 1.08 | 1.16 | 1.08 | 1.05 | 1.42 | 1.14 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 261.42 | <145 | <145 | <145 | 136 | <130 | - | - | 78 | 42 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 10 | <PQL | <PQL | <PQL | <PQL | <130 | - | - | 2 | 3 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | <0.4 | <0.4 | <0.4 | <0.4 | <0.5 | - | - | - | 0.16 | 0.23 | 0.16 | 0.12 | 0.55 | 0.12 |
| TN:TP ratio | - | - | - | - | - | 11 | - | - | 11 | 19 | 13 | 12 | 21 | - |
| pH | 7.9 | 8.9 | 8.3 | 8.4 | 8.3 | 8.7 | - | - | 8.1 | 8.5 | 8.2 | 8.3 | 7.9 | 7.9 |
| Alkalinity as CaCO3 (mg/L) | 133 | 96 | 83 | 104 | 119 | 118 | - | - | 125 | 135 | 92 | 124 | 112 | 130 |
| Silica as Si (mg/L) | - | - | - | - | - | - | - | - | 2.33 | 2.74 | 2.61 | 1.75 | - | - |
| Dissolved Organic Carbon (mg/L) | <7.6 | <7.6 | <7.6 | <7.6 | <6.4 | <6.2 | - | - | 6.65 | 3.48 | 9.77 | 8.29 | - | - |
| Inorganic Suspended Solids (mg/L) | 6 | <5 | <5 | <5 | 4 | <4 | - | - | 2 | 3 | 4 | 8 | 5 | 8 |
| Volatile Suspended Solids (mg/L) | <8 | 9 | <8 | <8 | <9 | <8 | - | - | 6 | 6 | 2 | 6 | 4 | 5 |
| Total Suspended Solids (mg/L) | 10 | 12 | 8 | 10 | 10 | 11 | - | - | 9 | 9 | 5 | 7 | 9 | 14 |
| Carlson Trophic State Index (Secchi)* | 58 | 66 | 57 | 60 | 64 | 62 | - | - | 48 | 57 | 50 | 58 | 54 | 62 |
| Carlson Trophic State Index (Chl a)* | 59 | 72 | 53 | 65 | 63 | 67 | - | - | 65 | 73 | 57 | 57 | 59 | 60 |
| Carlson Trophic State Index (TP)* | 68 | 70 | 58 | 66 | 68 | 68 | - | - | 73 | 65 | 68 | 77 | 66 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |