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1 <br />Eigure 5. <br />180 <br />160 <br />140 <br />120 <br />100 <br />mg/1 80 <br />60 <br />40 <br />20 <br />0 <br />Aug-80 <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 />Surface Water <br />HC03 <br />Jan-82 May-83 Oct-84 Feb-86 Jul-87 Nov-88 Mar-90 <br />'~- TR-A ~ TR-B '•' TR-C O TR-D <br />Surface Water <br />S04 <br />Jan-82 May-83 Oct-84 Feb-86 Jul-87 Nov-88 Mar-90 <br />'~- TA-A ~' TR-B '•' TR-C 4 TR-D <br />