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• <br />• <br />200 <br />180 <br />160 <br />60 <br />90 <br />20 <br />0 <br />Dec-99 <br />Y <br />Dec-95 Dec-96 <br />-FTR-A -QTR-B tTR-C $TR-D <br />~~~ <br /> <br /> <br />Dec-97 <br />40 ^ _~ <br />20 ~ ~ - 7 <br />0 <br />Dec-87 Dec-88 Dec-99 Dec-90 Dec-91 Dec-92 Dec-93 Dec-99 Dec-95 Dec-96 Dec-97 <br />60 <br />fTR-A -~TR-B $TR-C $TR-D <br />• <br />Figure 7. Surface Water Calcium <br />200 <br />180 <br />160 <br />190 <br />120 <br />ti <br />~ 100 <br />E <br />BO <br />190 <br />120 <br />~ 100 <br />E <br />80 <br />12 <br />