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~J <br />POND 89 Mg, ~ Dissolved) <br />25 <br />20 <br />15 <br />mg/1 <br />10 <br />5 <br />0 <br /> <br />^ MIN. <br />® MEAN <br />® MAX. <br />~~~.ek::G'i~'i,:i.+i~,~d4ryi:;,:~~•::a~,:~si'~:~;,:i ~.~.~ ~ ~+i~3 ~tayetV!:.._ ~~ r~.~'.35`#e..:~. ..&1'T?~'~Lti".':~.,c~:~.hs~,`.. ~Sa~!•~'i a.. :'`: <br />1987 1986 1985 1984 1983 <br />