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1 <br />1 <br />Figure 7. SurFace Water Calcium <br />250 <br />200 <br />150 <br />.~ <br />E <br />100 <br />50 <br />0{- <br />Dec-96 <br />250 <br />200 <br />150 <br />.a <br />E <br />100 <br />50 <br />Dec-99 <br />0 <br />Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 oec-99 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 <br />tTR-A --~-TR-B tTR-C QTR-D <br />Dec-97 Dec-98 <br />fTR-A -I-TR-B -QTR-C QTR-D <br />