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• increase in values as ground-water flow to the stream becomes a larger portion of the total <br />flow. The SAR values measured in 2000 were within the natural ranges for this site. Otiter <br />chemical constituents analyzed from samples collected from the surface water sites <br />showed little change. The variations and magnitude in iron concentration observed in <br />2000 were below the range of natural values for these sites. The total aluminum <br />concentrations observed in 2000 are generally lower than the range in concentrations <br />observed in previous years, except for the September 2000 value for NPDES 011, which is <br />within the range of higher values observed at this site. The remainder of the minor <br />constituents measured in 2000 are low and within natural ranges. Monitoring data <br />indicates that Trapper Mine sed+ment rnntrol structures prevented any significant impacts <br />on the surface water systems downgradient of the mine in 2000. <br />• <br />r1 <br />U <br />6-7 <br />