| Report Year: 2009 |
| Lacey Keosauqua Park Lake, Van Buren County |
| Summary Data Table |
| Parameter | 7/21/2009 | 6/16/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 7.9 | 7.9 | 7.9 | 7.8 | 7.7 | 7.1 | 8.1 | 8.0 | - | 8.6 | 8.2 |
| Thermocline Depth (m) | 1.7 | 2.6 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.3 | 1.4 | 1.4 | 1.6 | 3.2 | 2.7 | 2.8 | 1.1 | - | 1.2 | 2.6 |
| Temperature(oC) | 24.1 | 22.5 | 23.3 | 26.1 | 25.0 | 28.3 | 24.2 | 27.1 | - | 22.1 | 26.5 |
| Dissolved Oxygen (mg/L) | 8.0 | 9.2 | 8.6 | 8.5 | 7.8 | 9.5 | 7.9 | 8.4 | - | 8.5 | 7.4 |
| Dissolved Oxygen Saturation (%) | 95 | 106 | 100.8 | 104.2 | 94.3 | 121.6 | 94.7 | 105.8 | - | 92.5 | 92.0 |
| Specific Conductivity (μS/cm) | 250.0 | 260.0 | 255.0 | 232.2 | 315.2 | 307.4 | 357.3 | 342.6 | - | 219.2 | 317.2 |
| Turbidity (NTU) | 6.1 | 11.3 | 8.7 | 10.2 | 3.0 | 85.5 | 3.2 | 8.7 | - | 25.4 | 8.1 |
| Chlorophyll a (μg/L) | 3.0 | 10.0 | 6.5 | 10.3 | 39.0 | 14.6 | 7.4 | 22.6 | - | 4.0 | - |
| Total Phosphorus as P (μg/L) | 26 | 38 | 32 | 38 | 17 | 24 | 22 | 51 | - | 80 | 114 |
| SRP as P (μg/L) | - | - | - | 1 | - | 1 | 2 | 1 | - | - | - |
| Total Nitrogen as N (mg/L) | 0.52 | 0.53 | 0.53 | 0.63 | 0.61 | 0.60 | 1.34 | 1.00 | - | 0.86 | 0.77 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | - | 16 | 16 | 21 | 36 | 16 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 0.8 | - | 0.8 | 1.5 | 2.4 | 3.7 | 0.6 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | - | 0.26 | 0.12 |
| TN:TP ratio | 20 | 14 | 17 | 26 | 52 | 27 | 62 | 20 | - | 28 | 8 |
| pH | 8.2 | 8.3 | 8.3 | 8.3 | 8.3 | 8.2 | 8.3 | 8.0 | - | 7.5 | 7.8 |
| Alkalinity as CaCO3 (mg/L) | 96 | 97 | 97 | 98 | 123 | 112 | 127 | 76 | - | 90 | 165 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.62 | 3.17 | 5.76 | - | - | - |
| Dissolved Organic Carbon (mg/L) | 7.48 | 7.68 | 7.58 | 8.52 | 7.80 | 8.20 | 7.00 | 12.18 | - | - | - |
| Inorganic Suspended Solids (mg/L) | 2 | 4 | 3 | 1 | 2 | 5 | 1 | 2 | - | 30 | 3 |
| Volatile Suspended Solids (mg/L) | 4 | 1 | 2 | 3 | 2 | 3 | 2 | 5 | - | 4 | 2 |
| Total Suspended Solids (mg/L) | 5 | 5 | 5 | 5 | 3 | 5 | 3 | 8 | - | 33 | 5 |
| Carlson Trophic State Index (Secchi)* | 56 | 55 | 56 | 53 | 43 | 46 | 45 | 59 | - | 57 | 46 |
| Carlson Trophic State Index (Chl a)* | 41 | 53 | 49 | 53 | 67 | 57 | 50 | 61 | - | 44 | - |
| Carlson Trophic State Index (TP)* | 51 | 56 | 54 | 57 | 45 | 50 | 49 | 61 | - | 67 | 72 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |