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~J <br />SPRING & POND 22, SULFATE <br />70 <br />60 <br />50 <br />40 <br />mg/1 30 <br />20 <br />10 <br />0 <br /> <br />^ MIN. <br />^ MEaN <br />^ MIN. <br /> <br />1987 1986 1985 1984 1983 <br />