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<br />5 would generally be needed to greatly increase the mobility of most <br />heavy metals. <br />Available pH data is tabulated in Table B-1 of Appendix B. Field <br />pH has varied from 6.4 to 7.9 from well GA1 since 1974 for water from <br />this well. These variations are well within the natural range of <br />fluctuation. Similar variations have also been observed for well GA2. <br />Water from well GB2 has generally been slightly below neutral <br />• <br />before 1987. Values for this mine year are slightly above neutral. <br />The values from well GBS have been above neutral. The pH values for <br />well GB5 have been higher than normal since June of 1984. The bailed <br />sample, after air producing the well in September of 1986, was <br />significantly below the November of 1986 value, similar change was <br />seen during the 1987 annual sampling. This indicates that the well <br />bore is influencing the pH water in the well. Cement contamination is <br />likely in this well. <br />The field pH of water from the GC wells does not show a trend and <br />• <br />are within expected limits, except for some high pH values in 1976 and <br />1977 from well GC2. <br />Twenty Mile Sandstone well GD1 had a significant increase in pH <br />in 1984. Field pH values are presently back to levels that are <br />expected and that were present for the first several years from this <br />well. The recent pH values are thought to be more representative of <br />3-8 <br />