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1 <br />1 <br />1 <br />1 <br />Figure 4. <br />lzo <br />loo <br />80 <br />mg/1 60 <br />90 <br />20 <br />0 <br />Aug-80 <br />eo <br />70 <br />60 <br />50 <br />mg/1 40 <br />30 <br />20 <br />10 <br />0 <br />Aug-80 <br />Surface Water <br />Ca <br />~ ^ <br />i~ ~,~ <br />Jan-82 May-83 Oct-89 Feb-86 Jul-87 Nov-88 Mar-90 <br />'~" TR-A ~' TR-B '•' TA-C O TR-D <br />Surface Water <br />Mg <br />Jan-82 May-83 Oct-89 Feb-86 Jul-87 Nov-88 Mar-90 <br />'~" TR-A ~ TR-B '•' TR-C O TR-D <br />