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i~ <br />At the expected equilibrium water level, the American Tunnel will be the only man- <br />made pathway out of the mine, and it will be blocked. In case the equilibrium water <br />level is higher than expected, all other man-made pathways out of the Sunnyside Mine <br />will also be blocked with bulkheads (at the Terry Tunnel, F-Level Brenneman, and B- <br />Level Brenneman). <br />8.2 Estimated Rate of F/ow through F/ooded Mine Workings <br />The present rate of discharge from the American Tunnel is rather constant at <br />approximately 1600 gpm. Of this, approximately 930 gpm originates upstream of the <br />proposed bulkhead site near the underground SGC property line. The flow from the <br />American Tunnel is almost all ground water rather than surface water inflow. The <br />flow rates are stable and appear to represent an equilibrium condition. <br />As discussed in Section 3.4 the pre-mining ground-water movement was from <br />Sunnyside Basin toward Cement Creek. The water entering the American Tunnel <br />upstream of the bulkhead site has merely been captured on its way to Cement Creek <br />and so that its transit time is reduced. The capture zone for water entering the mine <br />workings extends well beyond the mine workings themselves. Therefore, the ground <br />water which will pass through the Sunnyside Mine workings after an equilibrium water <br />level is reached will be far less than 930 gpm. <br />sunny~wpltraci122511Mar 7 993.Rpt <br />51 <br />HMI SIRI011 HYDRO-SEARCH <br />