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7.0 RATE OF LEAKAGE AROUND BULKHEADS <br />The rate of leakage through the bedrock in the immediate vicinity of each proposed <br />bulkhead is expected to be less than 25 gallons per minute. Support for this estimate <br />is detailed in the remainder of this section. The bulkhead design by Dr. John Abel <br />(see "Bulkhead Design for the Sunnyside Mine: Sunnyside Gold Corp., An Echo Bay <br />Company", 1993) is intended to minimize the amount of leakage through the bulkhead <br />itself, and at the contact between the bulkhead and the bedrock. The anticipated <br />overall rate of ground-water flow from the flooded mine workings to Cement Creek <br />is discussed in Section 8.2. <br />7.1 Equilibrium Water Leve/ Behind the Bu/kheads <br />The water level behind the proposed bulkheads is expected to rise until the rate of <br />outflow from the flooded mine workings is equal to the rate of inflow from the ground <br />water system and openings in Sunnyside Basin. The outflow will be via natural <br />(fracture) pathways because all possible man-made pathways will be blocked by <br />bulkheads all the way up to the level of the surface in Sunnyside Basin. <br />The equilibrium water level in the flooded mine workings is anticipated to be just <br />below F level (approximately 11,500 feet msl). This is based on historical <br />observations of water levels in the Sunnyside Mine after 20 years of inactivity (Simon <br />Hydro-Search, 1992, pp. 18-19). <br />sunnylwp\traci\2251 \Mart 993. Rpt L}Q <br />H:t StIT1011 HYDRO-SEARCH <br />