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<br />PONQ 85 Ca, (Dissolved <br />~ mg/1 <br />~i <br />70 <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br />0 <br />~ MIN. <br />® MEAN <br />® MAX. <br />.Ml3~uill ri~tl ~ i~ ~ _ <br />1987 1986 1985 1984 1983 <br />