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<br />SPRING & POND 20 Na, Dissolved} <br /> <br />mg/l <br /> <br />45 <br />40 <br />35 <br />30 <br />25 <br />20 <br />t5 <br />10 <br />5 <br />0 <br />__... _.. ~:~~ ~t~:k:.._, .~ ~~:::~... _...._.,. <br /> <br />^ MiN. <br />^ MEAN <br />^ r1Ax. <br /> <br />1987 1986 1985 1984 1983 <br />