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2410 and 1660 umhos/cm for September and November, respectively, <br /> in a pond just downgradient of the seep. <br />3.3 pH <br />Field pH is an important parameter to measure bec~~use some <br />coal spoils have the potential to increase acidity of the ground <br />water which increases the mobility of most 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 of ApF,endix B. <br />Field pH has varied from 6.3 to 7.9 from well GA1 since 1974 far <br />water from this well. These variations are well within the <br />natural range of fluctuation. Similar variations have also been <br />observed for well GA2. <br /> Water from well 6B2 has generally been near or slightly <br /> <br /> below neutral through 1988. Values for this mine year are <br /> neutral except for the March value. The values from well GBS <br /> have been above neutral. The pH values for well GB5 have been <br />higher than normal since June of 1964. The bailed sample, after <br />air producing the well in September of 1986, was significantly <br />below the November of 1986 value, similar change was see=n during <br />the 1987 and 1988 annual samplings. This indicates that the well <br />bore is influencing the pH of the ground water in the well. <br />Cement contamination is likely in this well. <br />The field pH of water from the GC wells does not show a <br />trend and are within expected limits, except for some high pH <br />values in 1976 and 1977 from well GC2. <br />Twenty Mile Sandstone well GD1 had a significant increase in <br />3-17 <br />