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<br />3,3 pH <br />Field pH is an important parameter to monitor because some <br />r_oal spoils have the potential to increase acidity of the ground <br />saater which increases the mobility of mast heavy metals. A pH of <br />less than 5 would generally be needed to greatly increase the <br />mobility of most heavy metals. <br />Available pH data is tabulated in Table B-1 (page B-4~) of <br />Appendix R. Field pH has varied from 6.9 to 7.1 in 199? for water <br />from well GA1. These variations are well within the natural range <br />of fluctuation. <br />Water from we 11 UB2 has Qenerally been near or slightly below <br />7 with the 199? values near this value. The pH values from well <br />GB5 have been ahoy? 7. The pH values for well GB5 have been higher <br />than normal since June of 1984. The pumped sample for the third <br />quarter £or 199? was significantly below the remainder of the <br />samples and may be approaching the aquifer pH. This indicates that <br />the well bore is influencing the pH of the ground water in this <br />well. Some cement contamination is likely. <br />The field pH of water from the GC wells does not show a trend <br />.and are within expected limits, except for some high pH values in <br />1976 and 1977 from well GC2. <br />Well GD1 had a significant increase in pH in 1984. Field pH <br />vaL=es are presently back to levels that are expec±ed and that were <br />present for the First several years from this well. The recent <br />U <br />field pH values are thought to be more representative of the <br />aq~ai£er water because well GD1 has been pumped consistently in the • <br />3-8 <br />