| Report Year: 2011 |
| Lake Anita, Cass County |
| Summary Data Table |
| Parameter | 6/15/2011 | 8/2/2011 | 9/13/2011 | 2011 | 2010 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 8.4 | 9.7 | 8.4 | 8.8 | 9.4 | 9.6 | 8.8 | 7.3 | - | - | 8.9 | 8.6 | 8.0 | 8.5 |
| Thermocline Depth (m) | Nil | 1.6 | 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) | 2.1 | 0.6 | 0.7 | 1.1 | 0.6 | 1.0 | 1.0 | 0.9 | - | - | 1.4 | 0.8 | 1.0 | 0.9 |
| Temperature(oC) | 21.3 | 30.9 | 22.1 | 24.8 | 24.7 | 23.7 | 25.2 | 24.9 | - | - | 23.3 | 25.2 | 23.3 | 25.3 |
| Dissolved Oxygen (mg/L) | 8.3 | 10.3 | 3.4 | 7.3 | 9.2 | 13.0 | 11.6 | 7.2 | - | - | 8.0 | 9.6 | 8.2 | 8.8 |
| Dissolved Oxygen Saturation (%) | 93 | 139 | 39 | 90.2 | 112.0 | 155.2 | 140.3 | 86.3 | - | - | 93.7 | 120.6 | 90.9 | 106.7 |
| Specific Conductivity (μS/cm) | 300.0 | 230.0 | 260.0 | 263.3 | 260.0 | 260.0 | 297.8 | 329.6 | - | - | 286.0 | 289.7 | 243.9 | 274.0 |
| Turbidity (NTU) | 3.7 | 26.9 | 7.3 | 12.6 | 12.9 | 12.5 | 16.2 | 11.8 | - | - | 17.1 | 20.0 | 25.8 | 14.2 |
| Chlorophyll a (μg/L) | 14.1 | 55.0 | 48.6 | 39.2 | 36.9 | 28.3 | 48.6 | 38.3 | - | - | 18.8 | 55.1 | 58.0 | 17.2 |
| Total Phosphorus as P (μg/L) | 52.4 | 71.4 | 81.4 | 68.4 | 62.1 | 56.9 | 67 | 55 | - | - | 67 | 61 | 49 | - |
| SRP as P (μg/L) | <11 | <11 | <11 | <11 | <8 | <9 | <1 | <1 | - | - | 2.4 | 1.6 | - | - |
| TKN (mg/L) | 0.6 | 0.7 | 1.1 | 1 | 1 | - | - | - | - | - | - | - | - | - |
| Total Dissolved Solids (g/L) | 0.2 | 0.2 | 0.2 | 0.2 | - | - | - | - | - | - | - | - | - | - |
| Total Nitrogen as N (mg/L) | - | - | - | - | - | 0.9 | 0.78 | 1.54 | - | - | 1.20 | 1.16 | 1.38 | 1.12 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | <145 | <145 | <145 | <145 | <136 | <130 | <26 | <26 | - | - | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | <PQL | <PQL | <PQL | <PQL | <PQL | <130 | -2 | 0 | - | - | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | <0.4 | <0.4 | <0.4 | <0.4 | <0.5 | - | 0.12 | 0.38 | - | - | 0.12 | 0.12 | 0.15 | 0.31 |
| TN:TP ratio | - | - | - | - | - | 14 | 13 | 32 | - | - | 19 | 19 | 33 | - |
| pH | 8.2 | 9.1 | 7.8 | 8.4 | 8.6 | 8.6 | 8.7 | 8.5 | - | - | 8.4 | 8.3 | 8.1 | 7.8 |
| Alkalinity as CaCO3 (mg/L) | 133 | 93 | 86 | 104 | 110 | 108 | 120 | 116 | - | - | 83 | 106 | 107 | 120 |
| Silica as Si (mg/L) | - | - | - | - | - | - | - | - | - | - | 1.08 | 1.62 | - | - |
| Dissolved Organic Carbon (mg/L) | <7.6 | <7.6 | <7.6 | <7.6 | <6.4 | <6.2 | 6.81 | 7.36 | - | - | 9.67 | 9.47 | - | - |
| Inorganic Suspended Solids (mg/L) | <5 | <5 | <5 | <5 | <4 | <4 | 2 | 4 | - | - | 6 | 3 | 7 | 12 |
| Volatile Suspended Solids (mg/L) | <8 | 17 | 8 | 9 | <9 | 9 | 8 | 6 | - | - | 8 | 10 | 6 | 8 |
| Total Suspended Solids (mg/L) | <6 | 17 | 10 | 10 | 9 | 12 | 10 | 10 | - | - | 14 | 14 | 13 | 13 |
| Carlson Trophic State Index (Secchi)* | 50 | 67 | 66 | 58 | 67 | 60 | 61 | 61 | - | - | 55 | 63 | 60 | 62 |
| Carlson Trophic State Index (Chl a)* | 57 | 70 | 69 | 67 | 66 | 63 | 69 | 66 | - | - | 59 | 70 | 70 | 59 |
| Carlson Trophic State Index (TP)* | 61 | 66 | 68 | 65 | 64 | 62 | 65 | 62 | - | - | 65 | 63 | 60 | - |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |