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1 <br />r <br />1 <br />i <br />Figure 4. <br />Surface Water <br />Ca <br />120 <br />100 <br />~ 80 <br />E 60 <br />40 <br />20 <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 />Mg <br />rl <br />a <br />E <br />eo <br />70 <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br />0 <br />Jun-81 Aug-82 Oct-83 Dec-84 Feb-86 Apr-87 Jun-88 Aug-89 Oct-90 <br />''F TR-A ~ TR-B '•' TR-C 4 TR-D <br />