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All of the 2007 N03 values were below the drinking water standard of 10 mg/1. Well P-3 <br />has historical) contained nitrate concentrations above 10 m but this well was durin the <br />Y ~ ~'y g <br />2007 sampling. <br />3.5 OTHER CONSTITUENTS <br />The major constituents other than bicarbonate and carbonate are presented on pages B-101 <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 lower values in 2006 and 2007. Sodium <br />concentrations are much smaller in backfill well GF-11. The SAR values observed in 2007 in <br />water in the Trapper wells were very similaz to recently observed and natural values at Trapper <br />Mine. None of the 2007 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 aze dissolved concentrations. The "tr" subscri t for iron indicates total recoverable iron. <br />P <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 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 />• <br />Trapper Mining Company 3-9 <br />2007 Annual Report <br />