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Fiqure 5. <br />~' <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />~~ <br />Surface Water <br />HCO3 <br />soo <br />400 <br />~, <br />tr, 300 <br />E <br />200 <br />100 <br />0 <br />Jun-B1 Jul-82 Sep-83 Oct-84 Nov-85 Dec-86 Jan-88 Feb-89 Mar-90 May-91 <br />'Q'TR-A ~ TR-B "'TR-C 4 TR-D <br />Surface Water <br />SO4 <br />soo <br />400 <br />z 5~. <br />a <br />E 200 <br />100 <br />0 <br />Jun-81 Jul-82 Sep-83 Oct-84 Nov-85 Dec-B6 Jan-88 Feb-89 Mar-90 May-91 <br />'Q'TR-A QTR-B 'Q'TR-C O TR-D <br />f~ <br />