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3.3 pH <br />Field pH is an important parameter to monitor because some coal spoils have the <br />potential to increase addity of the ground water, which increases the mobility of most heavy <br />metals. A pH of less than 5 would generally be needed to greatly ina~ease the mobility of <br />most heavy metals. <br />Available pH data is tabulated in Table B-1 of Append'a B. The pH of water from <br />well GB-2 was near neutral in 2003. The pH value from well GB-5 in 2003 was 8.5 and 8.8, <br />which is similar to historical values from this well. <br />The field pH of water from the GC wells has generally been slightly above 7.0 and <br />Eras been at similar values since the initiation of disturbance in this area. <br />Feld pH from welt GD-2 does not demonstrate a trend and is near neutral. The <br />upgradient mining in the QR seams has not significantly affected the pH in this area of the <br />aquifer. The pH values from bacldill well GD-3 are 6.4 and 6.8 for 2003, which is near the <br />values in the native aquifer at well GD-2. The QR aquiifer at GEl has values above neutral <br />for 2003. Ttie pH of water from well GE-2 in 2003 were ~milar to values obi during <br />previous years for this well. The pH values for well GE-3 were also similar and above <br />neutral. <br />Twenty Mile Sandstone well GF-1 generally contains water with a pH near neutral, <br />while the latest pH from U aquifer well (GF-2) was 8.9. The KL.M aquifer well (GF-3) at this <br />site contained water with a pH greater than 8. A similar pH was observed for the HI aquifer <br />at well GF-4 in 2003. Bacldill well GF5 had field pH values above 7.0 in 2003, while the <br />field pH for backfill well GF-7 was near neutral. The field pH values in backfili well GF-11 for <br />2003 were near neutral. The field pH in well GF-6 (QR) was also above neutral in 2003. <br />3-9 <br />