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Table 5.2 - Lake WaEer Quality Report Card Grade Rangesi <br />Total Phosphorus Chlorophyll "a" Watcr Clarity <br />Grade (ug/l) (ug/1) (meters) Commen3lExpianation <br />Exceptional quality; no <br /><23 <10 �3.0 recreational use impairment <br />A <br />Very good quality; minor <br />recreationai impairment, <br />B 23-32 20-30 Z•2-3•fl often in late summer <br />Average quality for this <br />C 33-68 20-48 1.2-2.2 region; moderate <br />impairment for recrcational <br />use, o�te� in the later half of <br />the summer <br />D 69-152 48-87 .7-L2 Poor quality; rccreational <br />use severely impaired <br />F >152 >77 <. 7 Extremely poor yaality; no <br />recreational use ossible <br />Grades characterize open-water quality of lakes_ Other nuisances, such as abundance of ayuatic plant growth, are not <br />accounted for <br />Z Mean values for May-Scptember �eriod <br />Soarce: Twin Cities Metropolitan Council <br />Based on data for 2001, the grades for Langton and Bennett Lakes are presented in Table 5.3. <br />Table 5.3 - Water Quality Grades for Rose�ille Lakes <br />(baseci on mean recreation season values fo�' Total Phospharous (TP)) <br />ake ata Year ota! Phosphorus Value rade <br />(ug/I) <br />ennett 2001 14a D- <br />angton 2001 80 D+ <br />City of Rose+�ille ;� <br />Parks Ntatirral Resotrrce lYlanngement <br />