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i <br />1 <br />1 <br />1 <br />1 <br />Figure 4. <br />Surface Water <br />Ca <br />120 <br />100 <br />BD <br />mg/1 60 <br />90 <br />20 <br />0 <br />Aug-BO <br />Jan-82 May-83 Oct-84 Feb-86 Jul-87 <br />'~' TR-A '0' TR-B '~' TR-C '~' TR-D <br />Surface Water <br />Mg <br />60 <br />50 <br />40 <br />mg/1 30 <br />20 <br />10 <br />0 <br />Auq-80 <br />Nov-88 <br />NOV-88 <br />Jan-82 May-B3 Oct-84 Feb-86 Jul-87 <br />'~' TR-A '~' TR-B '~' TR-C '0' TR-D <br />