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1 <br />1 <br />1 <br />Figure 19. Surface Water Iron <br />0.70 <br />0.60 <br />0.50 <br />0.40 <br />m <br />E 0.30 <br />0.20 <br />0.10 <br />0.00 <br />Dec-93 <br />25 <br />Nov-99 <br />Dec-94 Dec-95 Nov-96 Nov-97 Nov-98 <br />f TR-A -QTR-B QTR-C QTR-D <br />