| Report Year: 2011 |
| East Lake (Osceola), Clarke County |
| Summary Data Table |
| Parameter | 5/23/2011 | 7/11/2011 | 8/22/2011 | 2011 | 2010 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 4.2 | 4.3 | 3.9 | 4.1 | 4.1 | 4.2 | 4.1 | 4.1 | 4.3 | 4.5 | 4.1 | 4.3 | 4.3 | 4.4 |
| Thermocline Depth (m) | 1.5 | 1.3 | 2.0 | 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) | 0.4 | 0.6 | 0.5 | 0.5 | 0.6 | 0.6 | 0.8 | 0.6 | 0.3 | 0.4 | 0.3 | 0.4 | 0.5 | 0.4 |
| Temperature(oC) | 21.9 | 28.4 | 26.5 | 25.6 | 26.0 | 23.9 | 26.5 | 24.0 | 24.7 | 22.8 | 23.5 | 25.1 | 23.1 | 24.7 |
| Dissolved Oxygen (mg/L) | 30.2 | 14.1 | 6.7 | 17.0 | 11.3 | 9.2 | 12.5 | 4.6 | 11.4 | 10.6 | 9.9 | 7.1 | 7.9 | 9.5 |
| Dissolved Oxygen Saturation (%) | 344 | 181 | 83 | 202.9 | 139.8 | 108.4 | 156.7 | 53.9 | 136.7 | 123.4 | 115.8 | 86.5 | 91.0 | 116.0 |
| Specific Conductivity (μS/cm) | 310.0 | 200.0 | 250.0 | 253.3 | 316.7 | 293.3 | 275.2 | 293.7 | 288.9 | 276.1 | 264.4 | 421.6 | 233.2 | 216.9 |
| Turbidity (NTU) | 8.9 | 19.7 | 25.6 | 18.1 | 11.8 | 27.8 | 22.2 | 60.6 | 25.4 | 33.5 | 33.8 | 29.9 | 43.9 | 26.0 |
| Chlorophyll a (μg/L) | 155.1 | 104.9 | 44.4 | 101.5 | 30.4 | 45.3 | 50.4 | 43.5 | 190.8 | 73.0 | 27.9 | 66.2 | 47.8 | 32.1 |
| Total Phosphorus as P (μg/L) | 218.0 | 232.4 | 332.8 | 261.1 | 278.0 | 417.6 | 489 | 268 | 272 | 316 | 282 | 221 | 384 | - |
| SRP as P (μg/L) | <11 | 36.8 | 132.2 | 132.2 | 74.2 | 343.6 | 374.8 | 106.3 | 115.9 | 135.9 | 190.7 | 29.8 | - | - |
| TKN (mg/L) | 3.1 | 3.4 | 2.0 | 3 | 1 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.2 | 0.1 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | - | 1.9 | 1.63 | 2.12 | 1.76 | 1.82 | 1.97 | 1.54 | 2.40 | 2.86 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | <145 | <145 | <145 | <145 | <136 | <130 | 50 | 278 | 139 | 123 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | <PQL | <PQL | <PQL | <PQL | <PQL | <130 | 11 | 14 | 12 | 46 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | <0.4 | <0.4 | <0.4 | <0.4 | <0.5 | - | 0.17 | 0.12 | 0.22 | 0.18 | 0.30 | 0.13 | 0.39 | 0.15 |
| TN:TP ratio | - | - | - | - | - | 5 | 3 | 8 | 7 | 6 | 8 | 7 | 6 | - |
| pH | 9.1 | 9.5 | 8.5 | 9.0 | 8.7 | 9.2 | 9.2 | 8.0 | 8.4 | 9.1 | 9.3 | 8.3 | 8.0 | 7.2 |
| Alkalinity as CaCO3 (mg/L) | 143 | 97 | 112 | 117 | 113 | 135 | 132 | 105 | 108 | 110 | 74 | 105 | 99 | 125 |
| Silica as Si (mg/L) | - | - | - | - | - | - | - | - | 4.77 | 5.31 | 5.02 | 5.81 | - | - |
| Dissolved Organic Carbon (mg/L) | 7.66 | <7.6 | <7.6 | <7.6 | 7 | 8 | 8.81 | 11.54 | 8.66 | 10.38 | 15.31 | 16.41 | - | - |
| Inorganic Suspended Solids (mg/L) | 11 | 10 | <5 | 8 | 4 | 8 | 7 | 5 | 8 | 9 | 12 | 7 | 10 | 5 |
| Volatile Suspended Solids (mg/L) | 13 | 16 | 12 | 13 | <9 | 12 | 12 | 8 | 14 | 13 | 16 | 15 | 11 | 5 |
| Total Suspended Solids (mg/L) | 24 | 25 | 16 | 22 | 11 | 20 | 18 | 14 | 22 | 22 | 28 | 22 | 22 | 9 |
| Carlson Trophic State Index (Secchi)* | 74 | 69 | 70 | 71 | 69 | 67 | 64 | 68 | 76 | 72 | 75 | 73 | 72 | 74 |
| Carlson Trophic State Index (Chl a)* | 80 | 76 | 68 | 76 | 64 | 68 | 69 | 68 | 82 | 73 | 63 | 72 | 69 | 65 |
| Carlson Trophic State Index (TP)* | 82 | 83 | 88 | 84 | 85 | 91 | 93 | 85 | 85 | 87 | 86 | 82 | 90 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |