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1 <br />1 <br />1 <br />Figure 5. <br />Surface Water <br />HCO3 <br />leo <br />160 <br />140 <br />120 <br />100 <br />mg/1 80 <br />60 <br />90 <br />20 <br />0 <br />Aug-80 <br />Jan-82 May-83 Oct-84 Feb-86 Jul-87 <br />'~• TR-A '~' TR-B '~' TR-C '~' TR-D <br />Surface Water <br />SO4 <br />950 <br />400 <br />350 <br />300 <br />250 <br />mg/1 200 <br />150 <br />100 <br />50 <br />0 <br />Aug-80 <br />Jan-82 May-83 Oct-84 Feb-86 Jul-87 <br />'~• TR-A '0• TR-B '~• TR-C '0' TR-D <br />Nov-88 <br />Nov-8B <br />