2002 Natural Resources Management

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Table 5.2 -Lake Water Quality Report Card Grade Ranged 1 Grades characterize open -water quality of lakes. Other nuisances, such as abundance of aquatic plant growth, are not accounted for 2 Mean values for May- September period Source: Twin Cities Metropolitan Council Based on data for 2001, the grades for Langton and Bennett Lakes are presented in Table 5.3. Table 5.3 -Water Quality Grades for Roseville Lakes (based on mean recreation season values for Total Phosphorous (TP)) Lake Total Phosphorus2 Chlorophyll "a "2 Water Clarity2 Grade (ug /1) (ug /1) (meters) Comment /Explanation 140 D- angton 2001 Exceptional quality; no A <23 <10 >3.0 recreational use impairment Very good quality; minor B 23 -32 20 -30 2.2 -3.0 recreational impairment, often in late summer Average quality for this C 33 -68 20 -48 1.2 -2.2 region; moderate impairment for recreational use, often in the later half of the summer D 69 -152 48 -87 .7 -1.2 Poor quality; recreational use severely impaired F >152 >77 <. 7 Extremely poor quality; no recreational use possible 1 Grades characterize open -water quality of lakes. Other nuisances, such as abundance of aquatic plant growth, are not accounted for 2 Mean values for May- September period Source: Twin Cities Metropolitan Council Based on data for 2001, the grades for Langton and Bennett Lakes are presented in Table 5.3. Table 5.3 -Water Quality Grades for Roseville Lakes (based on mean recreation season values for Total Phosphorous (TP)) Lake Data Year Total Phosphorus Value Grade (ug /1) ennett 2001 140 D- angton 2001 80 D+ City of Roseville 37 Parks Natural Resource Management