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<br /> Secchi Disc Transparencies <br />o.oo - --_ _ - ~ - _ _ -_ <br /> <br />- _ -- ---- <br />~` <br /> <br />Categories IV and V <br /> I.Category lll~ <br />1.00 <br /> <br />~~ $ T <br />~ § 2 ~ ~ a r ~ ¢ <br />2 1 <br />~ <br />§~ Categoryll_- <br />II T~ <br />~ <br />'~ <br />2.00 § <br />~ ~ <br />~ II <br />I <br />~" _, •1 <br />~ <br />Q <br />3 <br />00 ~ .~' <br />~ <br />. <br />m r <br />I <br />~ <br />~ 4.00 <br /> <br />y <br />Trendline (1997-2006) __ <br />Category <br />p Significant at the 99 % Confidence Level <br />5.00 - <br />~ <br />U Lake <br />~ 6.00 Classification <br /> System <br />7 <br />00 <br />. <br />1970 1975 1980 1985 1990 1995 2000 2005 2010 <br />Surface Chlorophyll a Concentrations <br />80.00 <br />J <br />70.00 <br />c <br />0 60.00 <br />m ' <br />50.00 ~ <br />m <br />U <br />0 40.00 <br />U Trendline (1997-2006) <br />R 30.00 Significant at the. 99% Confidence Le I <br />'~ <br />0 20.00 T T <br />T _ I <br />I, <br /> £ j jI , <br />- I <br />I <br />I <br />-°~ 10.00 <br />~~~~ ~ ,' <br />I ~ <br />CI ~I <br />~ <br />~ <br />, <br />~ <br />U , ,~ ~ <br />~ <br />0 <br />00 <br />. <br />19 70 1975 1980 1985 1990 1995 2000 2005 20 10 <br />Surface Total Phosphorus Concentrations <br />J 180 <br />a~ <br />v- 160 <br />c <br />.~ <br />~ 140 <br />~ 120 <br />to <br />v <br />0 100 <br />U <br />vl 80 <br />~ 60 <br />a <br />0 40 <br />a <br />20 <br />Y <br />`O <br />r o <br />¢ Trendline (1997-2006) <br />11 ~ ~ Significant at the 95 % Confidence Level <br />~ T_ § ~ <br />Y <br />' -§ .~ <br />1970 1975 1980 1985 1990 1995 2000 2005 2010 <br />Note: All data points represent the summer average value (± 1 Standard Error). <br />