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4.0 SURFACE WATER <br />Trapper Mine monitored one stream site and thirteen active NPDES discharge sites during <br />2016. The stream site Flume Gulch (S-1) was sampled during June and September 2016 to <br />characterize spring flows at this location. Flow was observed at NPDES sites 001, 002, 011, 020 and <br />021 in 2016. Sites 020 and 021 had flow only two and one times respectively during 2016. Baseline <br />stream site East Pyeatt (S3) is also NPDES site 011. Sites were monitored monthly throughout the <br />year. Sites NPDES 008, 009, 017, 018, 019, 022, 023 and 024 did not discharge during 2016. Maps <br />No. 2-1 through 2-3 show the locations of these surface -water sites. <br />4.1 SURFACE -WATER FLOW <br />The 2007-2016 flow data tabulated in Appendix C in Table C-1 represents instantaneous <br />measurements associated with NPDES water -quality sampling (see the attached CD in Appendix D <br />for all historical surface -water data). Recorded surface runoff was slightly higher in 2016 at the <br />Trapper Mine even with the precipitation being below average. <br />Figures C-1 through C-3 present the instantaneous flows versus time for the Trapper NPDES <br />sites for 2016. There was flow during each of the monthly samples of 2016 at NPDES 001 except <br />for August and September samples. The high flow during sampling was only 90 and 317 gpm for <br />NPDES 001 and 002 respectively in 2016. Surface flow at NPDES 011 was observed during each <br />monthly sample, except for January and February with a peak of 110 gpm during the October and <br />November sampling (see Figure C-2). NPDES 020 had flow during two of the monthly <br />measurements while NPDES 021 had a very small amount of flow in March (see Figure C-3). <br />Trapper Mining Company 4-1 <br />2016 Annual Report <br />