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Figure 7. Surface Water Calcium <br />Calcium: 1993 - 1995 <br />160 <br />190 <br />120 <br />100 <br />.~ <br />p~ 80 <br />E <br />60 <br />90 <br />20 <br />0 <br />Jan-93 <br />• <br />Jan-99 Jan-95 <br />QTR-A -QTR-H TTR-C ~-TR-D <br />Calcium: 1986 - 1995 <br />Jan-96 <br />160 <br />190 <br />120 <br />100 <br />.i <br />80 ~ ~ Q <br />60 ~ 1\Y_ <br />0 <br />• Jan-86 Jan-87 Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 Jan-96 <br />-'~-TR-A -QTR-B QTR-C ~-TR-D <br />ti~ <br />13 <br /> <br />