| Report Year: 2009 |
| Greenfield Lake, Adair County |
| Summary Data Table |
| Parameter | 6/8/2009 | 7/13/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 5.5 | 6.3 | 5.9 | - | - | 6.7 | 6.7 | 6.5 | 6.3 | 7.1 | 5.0 |
| Thermocline Depth (m) | 4.7 | 4.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.2 | 0.8 | 1.0 | - | - | 2.3 | 1.2 | 2.0 | 1.2 | 1.6 | 0.9 |
| Temperature(oC) | 21.5 | 24.2 | 22.8 | - | - | 24.1 | 22.5 | 22.9 | 26.6 | 24.3 | 25.5 |
| Dissolved Oxygen (mg/L) | 8.8 | 8.8 | 8.8 | - | - | 7.5 | 9.2 | 9.3 | 6.8 | 10.6 | 9.8 |
| Dissolved Oxygen Saturation (%) | 100 | 105 | 102.5 | - | - | 89.2 | 105.7 | 107.1 | 84.7 | 131.0 | 119.9 |
| Specific Conductivity (μS/cm) | 350.0 | 300.0 | 325.0 | - | - | 343.3 | 378.3 | 344.8 | 374.4 | 324.5 | 348.1 |
| Turbidity (NTU) | 8.4 | 6.7 | 7.5 | - | - | 9.8 | 10.4 | 4.8 | 4.5 | 7.0 | 21.3 |
| Chlorophyll a (μg/L) | 38.0 | 51.0 | 44.5 | - | - | 34.6 | 73.3 | 14.2 | 15.2 | 18.7 | 19.5 |
| Total Phosphorus as P (μg/L) | 64 | 100 | 82 | - | - | 75 | 68 | 81 | 141 | 69 | 173 |
| SRP as P (μg/L) | 1 | - | 1 | - | - | 12 | 2 | 10 | 3 | - | - |
| Total Nitrogen as N (mg/L) | 0.28 | 1.30 | 0.75 | - | - | 1.08 | 1.16 | 1.08 | 1.05 | 1.42 | 1.14 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 20 | 39 | 30 | - | - | 79 | 44 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 3.6 | 5.6 | 4.6 | - | - | 2.5 | 3.9 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.12 | 0.12 | - | - | 0.17 | 0.22 | 0.17 | 0.12 | 0.55 | 0.12 |
| TN:TP ratio | 3 | 13 | 8 | - | - | 15 | 19 | 13 | 12 | 21 | 7 |
| pH | 8.7 | 8.5 | 8.6 | - | - | 8.1 | 8.5 | 8.2 | 8.3 | 7.9 | 7.9 |
| Alkalinity as CaCO3 (mg/L) | 137 | 119 | 128 | - | - | 125 | 135 | 92 | 124 | 112 | 130 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.33 | 2.74 | 2.61 | 1.75 | - | - |
| Dissolved Organic Carbon (mg/L) | 5.74 | 5.41 | 5.58 | - | - | 6.65 | 6.49 | 9.77 | 8.29 | - | - |
| Inorganic Suspended Solids (mg/L) | 5 | 3 | 4 | - | - | 3 | 3 | 3 | 8 | 5 | 8 |
| Volatile Suspended Solids (mg/L) | 5 | 7 | 6 | - | - | 6 | 6 | 2 | 5 | 4 | 5 |
| Total Suspended Solids (mg/L) | 10 | 11 | 10 | - | - | 9 | 9 | 5 | 7 | 9 | 14 |
| Carlson Trophic State Index (Secchi)* | 57 | 63 | 60 | - | - | 48 | 57 | 50 | 58 | 54 | 62 |
| Carlson Trophic State Index (Chl a)* | 66 | 69 | 68 | - | - | 65 | 73 | 57 | 57 | 59 | 60 |
| Carlson Trophic State Index (TP)* | 64 | 71 | 68 | - | - | 66 | 65 | 68 | 76 | 65 | 78 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |