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Chart 19. Surface Water Potassium <br />• <br />4 <br /> !V" <br />n <br />Jan 93 Jan-94 Jan-95 Jan-96 J;,11-97 Jan 98 Jan 99 Jan-00 Jvi-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-07 Jan-08 Jan-09 <br />-f-TR-A -k-1R-B -?-TR-C' -O-TR-U <br />Chart 20, Surface Water Iron <br />O's <br />0.6 <br />0.4 <br />0.2 <br />u ~J <br />Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 lan-01 Jan-02 Jan-03 Jan-Oa Jam-05 Jan-06 Jan-07 Jan-U7 Jan-Uri Jan-09 <br />f TR- A- I R R fP I R-I) <br />0 <br />Charts 19 & 20 <br />