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The alluvial (P-1), Lewis Shale (P-3), 2nd White (P-5), and 3rd White Sandstone (P- <br /> 8) wells in Pyeatt Gulch all contain water with field pH that is generally near neutral. The <br /> 1999 values for alluvial wells 3-1 and COY were near neutral. The field pH values for well <br /> 81-03a were 8.8 and 9.3 in 1999. The field pH values for the GLUX-1 well were 7.6 and <br /> 7.9 in 1999. The field pH for well GMP-1 was 7.8 in 1999. The 1999 monitoring did not <br /> detect any indication of development of acidic water in the Trapper Mine ground water. <br /> 3.4 NH3 AND NO3 <br /> Concentrations of ammonia and nitrate are presented in Appendix B, starting on <br /> page B-159. In general, concentrations of ammonia vary significantly from year to year. <br /> Wells GD-2, GE-1, GE-2, GF-4, GF-5, GF-6, GF-7, 81-03A, GLUX-1, GP-2, GP-3, GP-5, GP-6 <br /> and GP-9 all contained NH3 concentrations that are greater than 1.0 mg/I in 1999. Several <br /> of these wells are located away from mining and contain natural levels of NH3 <br /> concentrations. All of the NH3 concentrations observed in 1999 are within the natural <br /> range of this constituent at Trapper Mine. <br /> All of the 1999 NO3 values were below the drinking water standard of 10 mg/l, <br /> except for one high value in well P-3. Well P-3 has historically contained similar nitrate <br /> concentrations prior to any mining in this area. <br /> 3.5 OTHER CONSTITUENTS <br /> The major constituents other than calcium and magnesium are presented on pages <br /> B-88 through B-123. An overall decrease in the calcium and magnesium concentrations <br /> has been observed since 1985 for wells GB-5 and GE-2 with present concentrations being <br /> 3-10 <br />