| Report Year: 2011 |
| Little Wall Lake, Hamilton County |
| Summary Data Table |
| Parameter | 6/6/2011 | 7/25/2011 | 9/6/2011 | 2011 | 2010 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 3.5 | 3.4 | 3.2 | 3.4 | 3.8 | 3.7 | 3.8 | 2.3 | 3.7 | 2.3 | 2.2 | 1.2 | 1.8 | 1.7 |
| Thermocline Depth (m) | Nil | Nil | 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) | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | 0.4 | 0.3 | 0.4 | 0.3 | 0.3 | 0.5 | 0.2 | 0.4 |
| Temperature(oC) | 23.7 | 28.2 | 21.1 | 24.3 | 23.0 | 25.2 | 24.7 | 23.5 | 26.2 | 23.3 | 22.8 | 24.5 | 23.8 | 25.0 |
| Dissolved Oxygen (mg/L) | 7.0 | 9.4 | 8.6 | 8.3 | 8.8 | 8.7 | 8.7 | 7.2 | 7.7 | 10.1 | 10.0 | 7.7 | 9.9 | 9.0 |
| Dissolved Oxygen Saturation (%) | 82 | 120 | 96 | 99.7 | 101.2 | 105.3 | 107.2 | 84.6 | 94.8 | 118.9 | 115.1 | 92.0 | 114.5 | 108.9 |
| Specific Conductivity (μS/cm) | 420.0 | 420.0 | 410.0 | 416.7 | 406.7 | 420.0 | 517.5 | 516.4 | 507.3 | 447.2 | 463.5 | 634.6 | 418.6 | 446.6 |
| Turbidity (NTU) | 22.2 | 33.2 | 24.0 | 26.5 | 14.3 | 19.1 | 29.7 | 36.9 | 21.2 | 268.0 | 27.5 | 23.1 | 61.7 | 32.7 |
| Chlorophyll a (μg/L) | 18.8 | 80.2 | 34.1 | 44.3 | 18.6 | 31.7 | 31.5 | 50.2 | 72.6 | 53.2 | 21.7 | 28.4 | 113.9 | 44.1 |
| Total Phosphorus as P (μg/L) | 74.4 | 71.7 | 63.3 | 69.8 | 80.4 | 89.0 | 69 | 92 | 84 | 108 | 100 | 83 | 253 | - |
| SRP as P (μg/L) | <11 | <11 | <11 | <11 | <8 | <9 | <1 | <1 | <1 | <1 | 1.8 | 2.2 | - | - |
| TKN (mg/L) | <0.5 | 3.6 | 1.5 | 2 | 1 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.3 | 0.3 | 0.3 | 0.3 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | - | 1.9 | 1.50 | 2.79 | 0.73 | 1.81 | 2.36 | 2.52 | 0.66 | 2.65 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 675.39 | <145 | <145 | 226 | <136 | <130 | <26 | 194 | 191 | 45 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 29 | <PQL | <PQL | <PQL | <PQL | <130 | 3 | 24 | 28 | 19 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | <0.4 | <0.4 | <0.4 | <0.4 | <0.5 | - | 0.22 | 0.14 | 0.34 | 0.67 | 0.19 | 1.70 | 0.28 | 0.29 |
| TN:TP ratio | - | - | - | - | - | 22 | 21 | 31 | 8 | 18 | 24 | 31 | 3 | - |
| pH | 7.9 | 8.4 | 8.6 | 8.3 | 8.6 | 8.9 | 8.5 | 8.5 | 8.5 | 9.1 | 9.0 | 8.6 | 8.7 | 8.0 |
| Alkalinity as CaCO3 (mg/L) | 178 | 175 | 135 | 163 | 156 | 160 | 217 | 201 | 181 | 163 | 132 | 184 | 165 | 188 |
| Silica as Si (mg/L) | - | - | - | - | - | - | - | - | 6.62 | 9.70 | 6.29 | 7.12 | - | - |
| Dissolved Organic Carbon (mg/L) | 13.09 | 9.11 | 10.69 | 11 | 12 | 15 | 15.30 | 21.92 | 27.72 | 22.98 | 23.44 | 31.38 | - | - |
| Inorganic Suspended Solids (mg/L) | 10 | 7 | <5 | 6 | <4 | 27 | 6 | 13 | 10 | 11 | 14 | 18 | 38 | 20 |
| Volatile Suspended Solids (mg/L) | 11 | 29 | 22 | 21 | 35 | <8 | 13 | 24 | 40 | 33 | 25 | 15 | 102 | 24 |
| Total Suspended Solids (mg/L) | 21 | 36 | 22 | 26 | 38 | 34 | 18 | 40 | 50 | 44 | 40 | 33 | 141 | 44 |
| Carlson Trophic State Index (Secchi)* | 75 | 72 | 72 | 73 | 76 | 76 | 72 | 75 | 74 | 77 | 75 | 72 | 86 | 74 |
| Carlson Trophic State Index (Chl a)* | 59 | 74 | 65 | 68 | 59 | 64 | 64 | 69 | 73 | 70 | 61 | 63 | 77 | 68 |
| Carlson Trophic State Index (TP)* | 66 | 66 | 64 | 65 | 67 | 69 | 65 | 69 | 68 | 72 | 71 | 68 | 84 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |