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7.5 ----._-------- _-_-.---- -- _.... ._..- _------------- 20 <br /> i <br /> 18 <br /> i <br /> 16 <br /> 6.5 <br /> 14 <br /> 12 <br /> 5.5 <br /> 10 <br /> 5 -1-------_. _.._ - -----..- ---- <br /> 8 <br /> 4.5 - � <br /> 6 <br /> 4J--_ <br /> 4 <br /> i <br /> 3.5 - — 2 <br /> } <br /> a` a a\ M \M M \M \$ $ <br /> IV N % !� Z" % t� % % e� N \ N \ N \ IV N N \ \ N N ~ N % <br /> —CRMW 3A-35 —.—CRMW 38-63 +-Precip —Poly.(CRMW 36-63) Poly.(Precip) <br /> Figure 10: Arequa Gulch field pH and total precipitation between sampling events data. Third order polynomial <br /> trends have been added to the precipitation and data from CRMW 313-63 to help illustrate the covariance. <br /> 5.3 Vindicator Valley <br /> Groundwater in Vindicator Valley has the third highest concentrations of sulfate and zinc, and the fourth <br /> highest manganese, based on the results from two monitoring wells (VIN 2A-270 and VIN 213-140). <br /> Sulfate and total precipitation between sampling events, from the Rigi meteorological station, are shown <br /> in Figure 11. The data suggest a general positive correlation between precipitation and sulfate in <br /> groundwater until 2010, when the relationship appears to have become somewhat negatively correlated. <br /> The sample-to-sample variability in sulfate concentration is not as great as in Squaw and Arequa <br /> Gulches, with a narrow range of slightly less than 200 mg/L. The data in Figure 11 suggest that sulfate <br /> has achieved a relatively stable concentration, and may have begun to decline. <br />