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• <br />Figure 3. Surface Water pH <br />12.0 <br />9.0} <br />a <br />u <br />c <br />0 <br />° 6 0 } <br />M . <br />N <br />b <br />C <br />N <br /> <br />N <br /> <br />°~,.e° <br />3.0 <br />• <br />0.0 ~ -~ I <br />Jan-94 Jan-95 Jan-96 <br />f-TR-A --QTR-B -~-TR-C f-TR-D <br />12.0 ~ <br />9.0 <br />N <br />L <br />C <br />.'J <br />a 6.0 <br />m <br />D <br />C <br />N <br />•+ <br />N <br />3.0 <br />~I~I«I~I~I~. <br /> <br />Jan-97 <br />+~i~ir <br />0.0 ~ ~-T-I I I- E I I I- I <br />Jan-87 Jan-RR Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 Jan-97 <br />-QTR-A -~-TR-B tTR-C ~-TR-D <br />• <br />7 <br />