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6.0 RATE OF FLOODING OF MINE WORKINGS <br />The rate at which the underground workings will fill with water after installation of the <br />proposed bulkheads depends upon the volume of mine workings, at the rate of inflow <br />of water to the mine workings, and the porosity of the surrounding fractured volcanic <br />rocks. Two methods of estimating the schedule of mine flooding predict that the <br />water level will substantially reach equilibrium (86% of equilibrium) in a range of <br />between one and ten years. <br />6. 1 Estimate Using Vo/ume of Workings and Constant F/ow <br />SGC staff used detailed maps and sections of the underground workings of the <br />Sunnyside Mine to calculate the volume of mine workings in increments of 100 <br />vertical feet. Sections along slopes and tunnels were planimetered and compared to <br />widths on plan views or to measured slope widths. The resulting mine volume data <br />are summarized in Table 4. Amore detailed volumetric analysis may be found in <br />Appendix B. <br />One method of estimating the schedule at which the mine workings wiii fill with water <br />is to assume that the volume of water entering the mine workings will remain <br />constant until an equilibrium water level is reached. Table 4 shows the schedule of <br />flooding using this method. The estimated time to flood the mine to the anticipated <br />equilibrium water level of 11,500 feet msl using 930 gpm the present flow rate at <br />sunny5wp\traci\2251\Mar1993.Rpt 34 <br />Hof SIf71011 HYDRO-SERRCH <br />