| Report Year: 2009 |
| Little Wall Lake, Hamilton County |
| Summary Data Table |
| Parameter | 6/25/2009 | 7/30/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 3.8 | 3.5 | 3.7 | 3.8 | 2.3 | 3.7 | 2.3 | 2.2 | 1.2 | 1.8 | 1.7 |
| Thermocline Depth (m) | 2.5 | Nil | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.5 | 0.3 | 0.4 | 0.4 | 0.3 | 0.4 | 0.3 | 0.3 | 0.5 | 0.2 | 0.4 |
| Temperature(oC) | 27.9 | 24.1 | 26.0 | 24.7 | 23.5 | 26.2 | 23.3 | 22.8 | 24.5 | 23.8 | 25.0 |
| Dissolved Oxygen (mg/L) | 9.2 | 7.5 | 8.4 | 8.7 | 7.2 | 7.7 | 10.1 | 10.0 | 7.7 | 9.9 | 9.0 |
| Dissolved Oxygen Saturation (%) | 118 | 90 | 103.7 | 107.2 | 84.6 | 94.8 | 118.9 | 115.1 | 92.0 | 114.5 | 108.9 |
| Specific Conductivity (μS/cm) | 430.0 | 450.0 | 440.0 | 517.5 | 516.4 | 507.3 | 447.2 | 463.5 | 634.6 | 418.6 | 446.6 |
| Turbidity (NTU) | 17.7 | 17.7 | 17.7 | 29.7 | 36.9 | 21.2 | 268.0 | 27.5 | 23.1 | 61.7 | 32.7 |
| Chlorophyll a (μg/L) | 32.0 | 25.0 | 28.5 | 31.5 | 50.2 | 72.6 | 53.2 | 21.7 | 28.4 | 113.9 | 44.1 |
| Total Phosphorus as P (μg/L) | 71 | 93 | 82 | 70 | 95 | 85 | 105 | 98 | 81 | 260 | 236 |
| SRP as P (μg/L) | - | - | - | - | - | - | 1 | 1 | 4 | - | - |
| Total Nitrogen as N (mg/L) | 1.87 | 2.25 | 2.06 | 1.50 | 2.79 | 0.74 | 1.81 | 2.36 | 2.52 | 0.66 | 2.65 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | - | 16 | 16 | 21 | 199 | 191 | 49 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | - | 1.5 | 1.5 | 3.3 | 25.1 | 27.9 | 20.7 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | - | 0.12 | 0.21 | 0.15 | 0.36 | 0.66 | 0.23 | 1.68 | 0.29 | 0.31 |
| TN:TP ratio | 26 | 24 | 25 | 22 | 30 | 8 | 18 | 25 | 32 | 3 | 12 |
| pH | 8.8 | 8.9 | 8.8 | 8.5 | 8.5 | 8.5 | 9.1 | 9.0 | 8.6 | 8.7 | 8.0 |
| Alkalinity as CaCO3 (mg/L) | 175 | 160 | 168 | 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) | 14.55 | 14.57 | 14.56 | 15.30 | 21.92 | 27.72 | 22.98 | 23.44 | 31.38 | - | - |
| Inorganic Suspended Solids (mg/L) | 38 | 6 | 22 | 6 | 13 | 10 | 10 | 14 | 18 | 38 | 20 |
| Volatile Suspended Solids (mg/L) | - | 19 | 19 | 12 | 24 | 40 | 33 | 25 | 15 | 102 | 24 |
| Total Suspended Solids (mg/L) | 24 | 24 | 24 | 18 | 40 | 50 | 44 | 40 | 33 | 141 | 44 |
| Carlson Trophic State Index (Secchi)* | 72 | 77 | 74 | 72 | 75 | 74 | 77 | 75 | 72 | 86 | 74 |
| Carlson Trophic State Index (Chl a)* | 65 | 62 | 63 | 64 | 69 | 73 | 70 | 61 | 63 | 77 | 68 |
| Carlson Trophic State Index (TP)* | 66 | 70 | 68 | 65 | 70 | 68 | 71 | 70 | 68 | 84 | 83 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |