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• Piqure 8. Surface Water Magnesium <br />Magnesium: 1993 - 1995 <br />C <br />100 <br />90 <br />80 <br />70 <br />60 <br />ti <br />50 <br />40 <br />30 <br />30 <br />10 <br />0 <br />Jan-93 <br />Jan-96 <br />Jan-94 Jan-95 <br />fTR-A -QTR-B f-TR-C QTR-D <br />Magnesium: 1986 - 1995 <br />I <br />loo <br />90 <br />80 <br />70 <br />60 <br />ti <br />50 <br />40 6 <br />30 <br />20 <br />10 ~ f ~ ~ ~ ~ ry <br />0 <br />Jan-86 Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-99 Jan-95 Jan-96 <br />~-TR-A -~-TR-B QTR-C QTR-D <br />14 <br /> <br />