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<br /> <br />mg/1 <br /> <br />16 <br />14 <br />12 <br />10 <br />8 <br />6 <br />4 <br />2 <br />0 <br />SULFATE <br />^ MIN. <br />^ MEAN <br />^ MAX. <br />'`y~3~. '..~.. %~;.ti a+R~M'~xY~,y~; 4,5::. tii0'.~.M.~s"~w"!br".~kw?., .~.a,p.v. <br />1987 1986 1985 1984 1983 <br />