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6,2 SURFACE WATER <br />Peak flows for the surface water sites at Trapper Mine in 2005 were normal. The <br />precipitation in 2005 was 18.79 inches, or 2.4 inches above the 28-year average for the Trapper <br />Project. The previous seven years of annual precipitation had been below normal precipitation prior <br />to the lazger precipitation in 2005. No failwes or monitoring site problems were encountered during <br />2005 and no compliance limits were exceeded in 2005. <br />Values of total suspended solids (TSS) were generally on the low side of ranges observed in <br />previous years. Total dissolved solids (TDS) were generally in an indirect relationship with flow rate <br />when adequate flow occurred at a site to determine the relationship. The TDS of the surface water <br />from the mine area is similaz to the TDS from the non-mined azea and, therefore, an increase has not <br />been defined, except for an increase in TDS during low flow conditions at NPDES sites 001 and 011, <br />The TDS, conductivity and major constituents vaned over expected ranges with an increase in • <br />values asground-water flow to the stream becomes a lazger portion of the total flow. The SAR <br />values measwed in 2005 were within the natural ranges for this site. Other chemical constituents <br />analyzed from samples collected from the surface water sites showed little change. The variations <br />and magnitude in iron concentration observed in 2005 were below the range of natural values for <br />these sites. The total aluminum concentrations observed in 2005 are within the range of <br />concentrations observed in previous years. The remainder of the minor constituents measured in <br />2005 are low and within natwal ranges. Monitoring data indicates that Trapper Mine sediment <br />control structures prevented any significant impacts on the surface wafer systems downgradient of <br />the mine in 2005. <br />Trapper Mining Company 6-6 • <br />2005 Annual Report <br />