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The 2017 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 2017. The 3rd White Sandstone aquifer well GP -9 <br />field pH values are typically near neutral. <br />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 2017 while the pH was near 9 in well GLEV-1. The 2017 monitoring did not detect <br />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 page B-54. <br />In general, concentrations of ammonia vary significantly from year to year. Wells GD -2, GD -3, GF - <br />4, GF -5, GF -6, GF -7, GP -2, GP -3, GP -5, GP -9 and P-8 all contained NH3 concentrations that are <br />greater than 1.0 mg/1 in 2017. Several of these wells are located away from mining and contain <br />natural levels of NH3 concentrations. All of the NH3 concentrations observed in 2017 are within the <br />natural range of this constituent at Trapper Mine. <br />All of the 2017 NO3 values were below the drinking water standard of 10 mg/l except well P- <br />5. Well P-5 has historically contained nitrate concentrations above 10 mg/1 and this well is dry <br />during most sampling events. <br />3.5 OTHER CONSTITUENTS <br />The major constituents other than bicarbonate and carbonate are presented on pages B-32 <br />through B-42. 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 />Trapper Mining Company 3-9 <br />2017 Annual Report <br />