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1994 (14.2 mg/I compared to 2.3 mgJl in 1993). This increase is thought to be anomalous and ,~ <br />should be viewed with caution until additional data confirms the high concentration. Wells CiBS <br />and GP7 showed slight NO, increases over 1993 values, while wells P3 and COY showed NO, <br />decreases over 1993 values. All 1994 NO, values for these wells were less than 1.5 mg/l. Well P3's <br />NO, concentrations continued to decline in 1994. Well P8 had a NO, concentration of 2.2 mg/l in <br />1994, down significantly from 8.2 mg/I in 1993, and is still within a natural range. No mine-related <br />sources of NO, have been identified. The fact that the wells on the undisturbed eastern portion of <br />the permit azea generally showed elevated concentrations of NH3and N03 in 1992, is indicative that <br />the observed changes in these constituents are a natural variation and not related to mine activities. <br />3.6 OTHER CONSTTI'UENTS e <br />The major constituents other than the carbonates are presented on pages B-83 through • <br />B-103. A decrease in the calcium and magnesium concentrations has been observed since 1985 for <br />wells GBS and GE2. The sodium concentrations in well GAl have increased the last few years. <br />This is likely a natural trend because the QR aquifer has not been mined upgradient of this well. <br />A decreasing trend in sodium has been observed at wells GF7 and GP6. A large increase in <br />magnesium and a significant increase in calcium, chloride and sulfate was observed in well GC2. <br />Phis increase could not be due to mining because it is located on the east side of the mine. Wells <br />GAl, GC1, GC3, GD2, GD3, GE1, GE2, GF3, GFl 1, GP4 and PS have shown an increasing trend <br />in sulfate concentrations. Decreasing trends have been observed in well GBS for sulfate, in wells <br />GF7 and GP6 for sodium and in well GP7 for magnesium. <br />7 k, - ~ ~, <br />3-12 (Revised 09/21/95) <br />