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r <br />1 <br />1 <br />1 <br />Figure 5. <br />Surface Water <br />HCO3 <br />soo <br />900 <br />~ 300 <br />a <br />£ zoo <br />loo <br />0 <br />Jun-81 Aug-82 Oct-83 Dec-84 Feb-86 Apr-87 Jun-88 Aug-B9 Oct-90 <br />'~~ TR-A ~ TR-B '•' TR-C d TR-D <br />Surface Water <br />SO4 <br />soo <br />900 <br />300 <br />ri <br />a 200 <br />E <br />100 <br />0 <br />Jun-81 Aug-82 Oct-83 Dec-89 Feb-86 Apr-87 Jun-88 Aug-89 Oct-90 <br />''~' TR-A ~ TR-B '•' TR-C 4 TR-D <br />