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All of the 2006 NO3 values were below the drinking water standard of 10 mg/l. Well P -3 <br />has historically contained nitrate concentrations above 10 mg/1 but this well was dry during the <br />2006 sampling. <br />3.5 OTHER CONSTITUENTS <br />The major constituents other than bicarbonate and carbonate are presented on pages B -102 <br />through B- 147. Declines in sodium concentrations at well GF -7 occurred from 1989 to 1996 with <br />slightly higher values in recent years except for a lower value in 2006. Sodium concentrations are <br />much smaller in backfill well GF -11. The SAR values observed in 2006 in water in the Trapper <br />wells were very similar to recently observed and natural values at Trapper Mine. None of the 2006 <br />SAR values indicate a significant trend in this parameter. <br />The heavy metals with a "t" subscript by their symbol represent total measurements, while <br />the others are dissolved concentrations. The "tr" subscript for iron indicates total recoverable iron. <br />Dissolved and total concentrations are similar for most of the heavy metals, except for iron <br />concentrations in some wells where the total values are significantly greater. <br />Iron concentrations have varied over large ranges near the mine pits and at distant wells but <br />no consistent trends have been observed. Levels of aluminum, barium, boron, phosphate and <br />manganese have also varied over significant ranges but no consistent trends have been observed. <br />Arsenic, cadmium, chromium, copper and lead concentrations have been low with a few <br />exceptions. Molybdenum, nickel and selenium concentrations have stayed low. The recent radium <br />226 values have been low. <br />Trapper Mining Company 3 -10 <br />2006 Annual Report <br />