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1 <br />Figure 6. <br />Surface Water <br />Na <br />b~ <br />E <br />25 <br />20 <br />15 <br />10 <br />5 <br />0 <br />Jun-81 Aug-82 Oct-83 Dec-89 Feb-86 Apr-87 Jun-88 Aug-89 Oct-90 <br />'~F TR-A ~ TR-B '•' TR-C O TR-D <br />Surface Water <br />Mn <br />o.e ^i <br />0.7 <br />0.6 <br />0.5 <br />a 0.9 <br />E 0.3 <br />0.2 • <br />0.1 ~. <br />0 ^ ^ ^ ^ • <br />Jun-81 Auq-82 Oct-83 Dec-84 Feb-86 Apr-87 Jun-88 Auq-89 Oct-90 <br />'~~ TR-A ~ TR-B '•' TR-C O TR-D <br />