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I <br /> 0.9 <br /> I <br /> 0.8 <br /> 0.7 <br /> 0.6 <br /> e <br /> i <br /> 0.4 ___. _- ---- <br /> 0.3 <br /> II <br /> 0.2 -Ih— ._. __.-- ----- -- --- <br /> I <br /> 0.1 <br /> i <br /> i <br /> x <br /> x • • • ■•x x xx <br /> o g o 0 0 o g S o 0 0 0 0 0 0 0 0 0 0 <br /> -+—GVMW M-70 -+-GVMW 22B-30 GVMW SA-250 —GVMW BB-50 <br /> Figure 20: Manganese data for Grassy Valley monitoring wells. <br /> Field pH data are shown in Figure 21. With the exception of the early time data, pH has been very <br /> consistent in all four wells. Well GVMW 813-50 shows the greatest sample-to-sample variability, generally <br /> fluctuating ±0.4 pH units. GVMW 22A-70 has significantly higher pH than the other three wells, but it is <br /> still within the range of the domestic well standard. <br />