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• trend. The upgradient mining in the QR seams has not affected the <br />pH in this area of the aquifer. The pH values from backfill well <br />GD3 are slightly below neutral but near the values in the native <br />aquifer at well GD2. Values from GE1 gradually declined for <br />several years and seem to have stabilized slightly above 7. The pH <br />of water from well GE2 has varied from slightly less than 7 to <br />approximately 9. The pH values for well GE3 have remained between <br />7.7 and 8.5 in 1991. <br />Twenty Mile Sandstone well GF1 generally contains water with <br />a pH near neutral, while the U aquifer well (GF2) and KLM aquifer <br />well (GF3) at this site contain water with a pH of approximately <br />8.5. A slightly higher pH (near 9) has been observed for the HI <br />• aquifer at well GF4. All three backfill wells, GF5, GF7 and GF11, <br />have field pH values near neutral. The field pH in well GF6 is <br />also near neutral. <br />Well GP1 has water with pH values above neutral, while well <br />GP2 water is generally near neutral. The field pH values for wells <br />GP3 and GP4 have shown little change for water collected from the <br />HI and KLM aquifers, respectively. Well GP3 has had pH values near <br />neutral, while values for well GP4 have been slightly less than 9. <br />Wells GP5 and GP6 are completed in the QR aquifer. The field <br />pH values from well GP5 are generally near a value of 8.6, while <br />the pH from well GP6 is above 7. <br />HI aquifer well GP7 has typically had water with field pH <br />values slightly above 7. Well GPB has water with a pH of near 8. <br />• <br />3-9 <br />