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<br /> <br /> <br />C-32). The limited conductivity data for NPDES sites 008 and 010 for 1997 are similar to <br />the Flume Gulch (S1) values. TDS, conductivity and major constituents increased as the <br />ground water contribution became a larger portion of the flow. The values, in general, are <br />within natural ranges but some increase over baseline likely has occurred. The overall <br />increase in conductivity over the last few years in NPDES 001 is likely due to mining. No <br />long-term trends are indicated by the major constituents. <br />5.3 OTHER CONSTITUENTS <br />Field pH values for all sites were very similar in 1997 to previous data. Values ranged from <br />near neutral to 9 for pH values at NPDES site 001. Other constituents analyzed showed <br />little change with all minor constituents within their natural ranges. All values addressed in <br />this report above permitted discharge levels have been addressed in the quarterly NPDES <br />discharge reports (DMR's) and justifications for those values, i.e. storm water, snow cover <br />melt-out, etc., have been submitted to the proper regulatory authorities. The iron <br />concentrations observed in 1997 in the surtace water for this readily available constituent <br />are all within the natural range for these sites. A large concentration was observed during <br />the large runoff event for site 011 on September 19, 1997 <br />concentrations are potential when the flow is larger. <br />Large natural iron <br />5-3 <br />