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4.0 PRESENT HYDROLOGY <br /> 4.1 Present Ground-Water Hydrology <br /> 4.1.1 Bedrock Permeability <br /> The permeability characteristics of the bulk of the ground-water flow system have not been <br /> affected by the excavation of the underground workings of the Sunnyside Mine. These <br /> characteristics are detailed in sgction 3.1.2. <br /> Within the voids created by mirhing the permeability is extremely high, and resistance to flow <br /> is mainly a function of the kinematic viscosity of the water. The majority of the underground <br /> mine workings are located beneath the Sunnyside Basin within an area extending 4000 feet from <br /> east to west, and 2500 feet from north to south. However, the workings now form a direct <br /> connection from the ground-water flow system beneath Sunnyside Basin to the Cement Creek <br /> watershed via the American Tunnel. <br /> The excavation of the underground workings has involved a tremendous amount of blasting. <br /> The fractures induced by blasting for underground mining activities propagate less than 20 feet <br /> from the blast site (Siskind and 1 umanti, 1974; Worsey, 1985; and Worsey, 1986). Hence, the <br /> zone of enhanced permeability due to mining is limited to the immediate vicinity of workings <br /> and to a few near-surface areas where workings have self-stoped upwards. <br /> sanjuan\sunny\11036 1\oct9 1.Rpt 31 <br /> I <br /> mi simon <br />