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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Figure 6. <br />25 <br />20 <br />15 <br />mg/1 <br />10 <br />5 <br />0 <br />Auq-80 <br />a.s <br />0.7 <br />0.6 <br />0.5 <br />mg/1 0.9 <br />0.3 <br />0.2 <br />0.1 <br />0 <br />Aug-80 <br />Surface Water <br />Na <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 />Mn <br />Jan-82 May-83 Oct-84 Feb-86 Jul-87 Nov-88 Mar-90 <br />'~- TR-A ~ TR-B '•' TR-C ~ TR-D <br />