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The 2000 monitoring did not detect any indication of development of acidic water in the • <br />Trapper Mine ground water. <br />3.4 NHa AND NOa <br />Concerrtrations of ammonia and nitrate are presented in Appendix B, starting on <br />page &164. In general, concentrations of ammonia vary significantly from year to year. <br />Wells GD-2, GE-1, GE-2, GF~, GF-5, GF-6, GF-7, 81-03A, GLUX-1, GP-2, GP-3, GP-5, GP-6, <br />GP-9 and P-5 all contained NH3 concentrations that are greater than 1.0 mg/I in 2000. <br />Several of these wells are located away from mining and wntain natural levels of NHs <br />concentrations. All of the NH3 concentrations observed in 2000 are within the natural <br />range of this constituent at Trapper Mine. <br />The laboratory only measured nitrate plus nitrite on the 2000 samples. These • <br />concentrations were used as nitrate values because nitrate concentrations cannot be <br />greater than the combination. The nitrate plus nitrate concentrations have been essentially <br />equal to the nitrate concentrations in the past for the ground water. All of the 2000 NOs <br />values were below the drinking water standard of 10 mg/I, except for one high value in <br />well P-3. Well P-3 has historically contained similar nitrate concentrations prior to any <br />mining in this area. <br />3.5 OTHER CONSTITUENTS <br />The major constituents other than calcium and magnesium are presented on pages <br />B-90 through B-126. 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 />