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0 <br />1 <br />2 <br />sv <br />3 <br /> <br />CATEGORY lV AND V. iI <br />CATEGORY III. <br />C __ <br />CATEGORY IL <br />i <br />~ ~ <br />I <br />I <br />I <br />I <br />CATEGORY I. <br />Action Level. <br />^mar •r rrrrrrrmr rrrrrrr rrrrrrms rarrrrmr^rr marrrmrrrrrrrsrr~r rm rmsrrmrrrrrrrrrrrrarmmrrrrrrssmr <br />0 <br />I <br />4 <br />Mean value of recent (0-3 yrs) <br />summer conditions. <br />Trendline--No significant <br />change over time. <br />5 <br />1970 <br />1975 1980 1985 1990 1995 2000 <br />Figure 9. Snail Lake historic water quality. Category levels are defined in the text. <br />P:\23\62\645\plan\new_snail_trend.xls <br />