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' Flow testing of boreholes in the American Tunnel yielded an estimated hydraulic <br />' conductivity of 5x10-5 cm/sec (0.15 feet/day). However, rock in the vicinity of the <br />flow tests exhibits more fracture permeability than is typical for the American Tunnel, <br />so this estimated hydraulic conductivity may be higher than the general average. <br />' Laboratory measurement of intergranular hydraulic conductivities of core from <br />proposed bulkhead sites showed a range from 108 to 1010 cm/sec. Laboratory <br />' measurement of two fractured cores, which appear to represent local blast damage, <br />showed hydraulic conductivity on the order of 10-8 cm/sec. <br />The Sunnyside Mine workings are expected to fill with water until an equilibrium is <br />reached between water flowing into the mine workings and water leaving the mine <br />workings via natural fracture pathways. Based on historical information the <br />equilibrium water level is expected to be approximately at F level (11,500 feet msl). <br />Once a bulkhead is installed in the American Tunnel, it is estimated that the water <br />level will substantially reach equilibrium (86% of equilibrium} in approximately 10 <br />years. <br />The rate of leakage through the bedrock in the immediate vicinity of each proposed <br />bulkhead is expected to be less than 1 gpm. However, if the permeability and <br />equilibrium water level are both higher than anticipated, such leakage through the <br />bedrock could be as much as 25 gpm. <br />cunny4wpltreci122511Mar7 993. Rpt 2 <br />Nil SIIT1011 HYDRO-SERRCH <br />