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All of the 2005 N03 values were below the drinking water standard of 10 mg/l. Well P-3 has . <br />historically contained nitrate concentrations above 10 mg/1 but this well was dry during the 2005 <br />sampling. <br />3.5 OTHER CONSTITi7ENTS <br />The major constituents other than bicarbonate and carbonate are presented on pages B-100 <br />through B-144. An overall decrease in the calcium and magnesium concentrations has been <br />observed since 1985 for well GE-2 with present concentrations being very small. Declines in sodium <br />concentrations at well GF-7 occurred from 1989 to 1996 with slightly higher values the last nine <br />years. Sodium concentrations are much smaller in backfill well GF-11. The SAR values observed in <br />2005 in water in the Trapper wells were very similar to recently observed and natural values at <br />Trapper Mine. None of the 2005 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 lazge 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 wncentrations have been low with a few exceptions. <br />Molybdenum, nickel and selenium concentrations have stayed low. The recent radium 226 values <br />have been low. <br />Trapper Mining Company 3-]0 <br />2005 Annual Report <br />