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• Figure B. Surface Water Magnesium <br />160 <br />140 <br />120 <br />100 <br />.a <br />~, 8 0 <br />E <br />60 <br />40 <br />20 <br />~- ~~ <br />Jan-94 Jan-95 Jan-96 Jan-97 <br />--E-TR-A -QTR-B ~-TR-C -f-TR-D <br />• <br />160 <br />140 <br />120 <br />100 <br />.. <br />o, R 0 <br />E <br />60 <br />40 , • ~ •\ w <br />r <br />0 <br />Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 <br />-f-TR-A -QTR-B ~FTR-C -~4~TR-D <br />• <br />13 <br />