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high SAR. Ground water systems at Trapper mine do not yield an adequate rate for • <br />irrigation and, therefore, are not very likely to be considered as a potential source. <br />3.5 NH, AND NO, <br />Concentrations of ammonia and nitrate are presented in Appendix B, pages B-144 <br />to B-173. In general, concentrations of ammonia vary significantly from year to year. Wells <br />GD-2, GD-3, GE-1, GE-2, GF-1, GF-3, GF-5, GF~, GF-11, 81-03A, GLUX-1, GP-2, GP-3, <br />GP-5, GP-6, GP-8, GP-9 and P-5 all contained NH3 concentrations that are greater than <br />1.0 mgA in 1996. Several of these wells are located away from mining and contain natural <br />levels of NH3 concentrations. All of the NH3 concentrations observed in 1996 are within the <br />natural range of this constituent at Trapper Mine. <br />The 1996 NO3 for well P-3 was 40 mg/1 and the only 1996 NO3 value above the • <br />drinking water standard of 10 mg/I. This value is similar to values observed in this well prior <br />to mining in this area and, therefore, the 1996 value is within the natural range for this well. <br />3.6 OTHER CONSTITUENTS <br />The major constituents other than the carbonates are presented on pages B-82 <br />through B-112. An overall decrease in the calcium and magnesium concentrations has <br />been observed since 1985 for wells GB-5 and GE-2 with present concentrations being very <br />small. The sodium concentrations in well GA-1 have increased the last few years. This is <br />likely a natural trend because the QR aquifer has not been mined upgradient of this well. <br /> <br />3-12 <br />