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4.0 SURFACE WATER <br />Trapper Mine monitored one stream site and nineteen active NPDES discharge sites during <br />2013. The stream site Flume Gulch (S -1) was sampled during June and September 2013 to <br />characterize spring flows at this location. Flow was observed at NPDES sites 001, 002, 011, 017, <br />018 and 020 in 2013. Sites 017 and 018 had flow only one time during 2013. Baseline stream site <br />East Pyeatt (S3) is also NPDES site 011. Sites were monitored weekly throughout the year. Sites <br />NPDES 008, 009, 019, 021, 022, 023 and 024 did not discharge during 2013. Maps No. 2 -1 through <br />2 -3 show the locations of these surface -water sites. <br />4.1 SURFACE -WATER FLOW <br />The 2013 flow data tabulated in Appendix C in Table C -1 represents instantaneous <br />measurements associated with NPDES water - quality sampling. Surface runoff was less in 2013 at <br />the Trapper Mine with the precipitation being below average except for some of the peaks in March <br />and April. <br />Figures C -1 through C -3 present the instantaneous flow versus time for the Trapper NPDES <br />sites for 2013. There was flow during each of the weekly samples of 2013 at NPDES 001 except for <br />most of the July and August and early September samples. The high flow during sampling was 110 <br />gpm 317 gpm. Surface flow at NPDES 011 was observed during half of the year with a peak of 287 <br />gpm on April 15 and NPDES 017 during one week (see Figure C -2). Figure C -3 shows that NPDES <br />018 and 020 sites had one and four flow events in 2013 respectively. This figure also shows that a <br />peak flow of 132 gpm was observed at NPDS Site 020 in 2013. A small flow existed for one week in <br />2013 from NPDES site 018. <br />Trapper Mining Company 4-1 <br />2013 Annual Report <br />