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• 4.0 SURFACE WATER <br />Trapper Mine monitored one stream site, five active NPDES discharge sites and one seep <br />associated with an NPDES site during 1994. The stream site is Flume Gulch (S1). The NPDES <br />sites were 001, 002, 006, 011 and 013. No discharge occurred through Coyote Dam in 1994. The <br />Coyote Dam Seep is below NPDES site 005. Baseline stream site East Pyeatt (S3) is also NPDES <br />site 011. Most sites were visited weekly throughout the year. Plots of flow versus time of the year <br />are presented for those sites monitored by continuous recorders including sites NPDES 001, 002, <br />006, and 011. Maps No. 2-1 through 2-3 show the locations of these surface-water sites. NPDES <br />site 011 had discharge originating from a spring that developed above the Parshall Flume. NPDES <br />site 016, Sage Gulch, was installed in October, 1994. <br />• 4.1 SURFACE-WATER FLOW <br />Flow measurements and samples were taken twice during 1994 for Flume Gulch site S 1. <br />The 1994 flow data tabulated in Table C-1 is an instantaneous rate associated with awater-quality <br />sample. <br />Figure C-1 presents the flow versus time for NPDES site 001 (Johnson Gulch). Average <br />flow during flow periods was 26.8 gpm. This reflects a large decline from 1993 due to the much <br />lower precipitation. No flows were recorded from late May through July after which the recorder <br />was removed. <br />NPDES site 002 (No Name Gulch) recorded a high flow of 347.6 gpm and overall average <br />flow of 34.9 gpm during the period (Figure C-2). The high flow observed was most likely due to <br />. snowmelt combined with spring snows and rain. Frozen ground also contributes to increased runoff <br />7k-C,E; <br />4-1 (Revised 09/21/95) <br />