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The alluvial (P-1) and 3rd White Sandstone (P-8) wells in Pyeatt Gulch all contain water <br />with field pH that is generally near neutral. The field pH values for wells GLEV-3 and GMP -1 were <br />near neutral in 2016 while the pH was near 9 in well GLEV-1. The 2016 monitoring did not detect <br />any indication of development of acidic water in the Trapper Mine ground water. <br />3.4 NM AND NO3 <br />Concentrations of ammonia and nitrate are presented in Appendix B, starting on page B-54. <br />In general, concentrations of ammonia vary significantly from year to year. Wells GD -2, GD -3, GF -5, <br />GF -6, GF -7, GP -2, GP -3, GP -5 and P-8 all contained NH3 concentrations that are greater than 1.0 <br />mg/l in 2016. Several of these wells are located away from mining and contain natural levels of NH3 <br />concentrations. All of the NH3 concentrations observed in 2016 are within the natural range of this <br />constituent at Trapper Mine. <br />All of the 2016 NO3 values were below the drinking water standard of 10 mg/1. Well P-3 has <br />historically contained nitrate concentrations above 10 mg/l but this well was dry during the 2016 <br />sampling. <br />3.5 OTHER CONSTITUENTS <br />The major constituents other than bicarbonate and carbonate are presented on pages B-32 <br />through B42. Declines in sodium concentrations at well GF -7 occurred from 1989 to 1996 with <br />slightly higher values in recent years. Sodium concentrations are much smaller in backfill well GF - <br />11. The SAR values observed in 2016 in water in the Trapper wells were very similar to recently <br />observed and natural values at Trapper Mine. None of the 2016 SAR values indicate a significant <br />trend in this parameter. <br />Trapper Mining Company 3-9 <br />2016 Annual Report <br />