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4.0 SURFACE WATER <br />Trapper Mine monitored one stream site and nineteen active NPDES discharge sites during <br />2006. The stream site Flume Gulch (S -1) was sampled during June and September 2006 sampling <br />to characterize spring flows at this location. Flow was observed at NPDES sites 001, 002, 005, <br />011, 013, 014, 015, 017, 020 and 021 in 2006. Baseline stream site East Pyeatt (S3) is also NPDES <br />site 011. Sites were monitored weekly throughout the year. Sites NPDES 008, 009, 012, 016, 018, <br />019, 022, 023 and 024 did not discharge during 2006. Maps No. 2 -1 through 2 -3 show the <br />locations of these surface -water sites. <br />4.1 SURFACE - WATER FLOW <br />The 2006 flow data tabulated in Appendix C in Table C -1 represents instantaneous <br />measurements associated with NPDES water - quality sampling. Surface runoff was similar to <br />normal in 2006 at the Trapper Mine due to the precipitation being 0.8 inches above average. <br />Figures C -1 through C-4 present the instantaneous flow versus time for the Trapper NPDES <br />sites for 2006. Flow occurred during the weekly samples between January 3, 2006 and May 23, <br />2006, September 19 and December 27 at NPDES 001. The high flow during sampling was a flow <br />of 1327 gpm on March 1, 2006 which is a typical peak at this site. High flows due to snowmelt at <br />NPDES 001 and NPDES 002 during 2006 were typical of average conditions (see Figure C -1). <br />Surface flow at NPDES 011 was observed during several samplings of this site in 2006 (see Figure <br />C -2). Figure C -3 shows that flow occurred from NPDES site 014 during three weeks of March <br />2006. One and five larger peak flows that were greater than 100 gpm occurred from NPDES site <br />Trapper Mining Company 4 -1 <br />2006 Annual Report <br />