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<br />POND 89, SULFATE <br />90 <br />80 <br />70 <br />• 60 <br />mg/1 40 <br />30 <br />20 <br />10 <br />0 <br /> <br />^ MIN. <br />®ME,ar~ <br />® MAX. <br />aA1.4,"'.'_~`atJax-a ~ -_''3[.L"v:]n.+, ..,a.V,9i~C~'~v,•~:aY Sh:;:;~'3~~'art ..~..st,,.z :.::, <br />1987 1986 1985 1984 1983 <br />