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4 - ___— __.__. .__.._- 18 <br /> 3.5 --- • 16 <br /> •• • • • 14 <br /> • <br /> • • 12 <br /> • <br /> 2-1 <br /> • • • • _ <br /> 10 <br /> 2 ---- ----------- • ------ ---- <br /> C 8 <br /> 1.5 <br /> • 6 <br /> j • • • I 4 <br /> •� <br /> 0.5 ,------ —y-. _- _-�-_ _.._.-- _ 2 <br /> o -}[ yy---- -- p gffi ffi -_Q q # lip 6. ■ -.. an, 0 <br /> g S 21 g g � 25 g g �S 25 25 25 0 0 0 0 0 0 0 o 0 0 0 0 0 o 0 0 <br /> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 <br /> -+—VIN 2B-140 Mn —.—VIN 2A-270 Mn —VIN 2A-270 Zn .--Precip —Poly.(VIN 28-140 Mn) —Poly.(Precip) <br /> Figure 12: Manganese,zinc,and precipitation(total between sampling events)for Vindicator Valley <br /> groundwater. <br /> Figure 13 presents the pH and precipitation data for Vindicator Valley. Overall pH has varied little, but <br /> displays a slightly increasing trend with time. Precipitation correlates somewhat positively with pH, <br /> suggesting that recharge of groundwater is rapid. <br />