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3.3 pH <br />Field pH is an important parameter to monitor because some coal spoils have the potential to <br />increase acidity of the ground water, which increases the mobility of most heavy metals. A pH of <br />less than 5 would generally be needed to greatly increase the mobility of most heavy metals. <br />Available pH data is tabulated in Table B-1 of Appendix B. The field pH of water from the <br />GC wells has generally been slightly above 7.0 and has been at similar values since the initiation of <br />disturbance in this area. <br />Field pH from well GD -2 slightly decreased in 2005 and near neutral the last ten years. The <br />upgradient mining in the QR seams has not significantly affected the pH in this area of the aquifer. <br />The pH values from backfill well GD -3 are 6.8 for 2015, which is near the values in the native <br />aquifer at well GD -2. <br />Similar pH values were observed for the HI aquifer at well GF -4 in 2015 to those observed <br />in previous years. Backfill well GF -5 had field pH values above 7.0 in 2015, while the field pH for <br />backfill well GF -7 was near neutral. The field pH values in backfill well GF -11 for 2015 were also <br />near neutral and similar to previous years. The field pH in well GF -6 (QR) was also above neutral in <br />2015. <br />Well GP -2 (KLM) water was slightly above neutral in 2015. The field pH values for well <br />GP -3 were higher than neutral from the HI aquifer and from well GP -4 above neutral for the KLM <br />aquifer. <br />Well GP -5 is completed in the QR aquifer and its field pH values are generally above 8. <br />The 2015 field pH values for HI aquifer well GP -7 were near neutral, while well GP -8 <br />(KLM) water had field pH values near 8.0 in 2015. The 3rd White Sandstone aquifer well GP -9 <br />field pH values are typically near neutral. <br />Trapper Mining Company 3-8 <br />2015 Annual Report <br />