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• where: <br />Q = 153,000 gal/day =the observed mine inflow <br />W = 52.8 ft = width of the mine immediately <br />below North Thompson Creek <br />(0.01 mile assumed) <br />I = 1 = gradient <br />In assuming North Thompson Creek is the sole source of the 153,000 <br />gpd, the preceding calculation is considered a worst-case example for <br />the purpose of demonstrating the maximum theoretical depletion of <br />North Thompson Creek. <br />Role of Secondarv Permeabili <br /> <br />Based on the water production rates during drilling, aquifer testing, <br />preliminary slug tests, and the geologist's analysis of cuttings, the <br />transmissivities of the water bearing zones are considerably less than <br />the transmissivity calculated on the basis of mine inflow. This <br />disparity can be explained by the contribution of secondary <br />permeability to the mine inflow. This hypothesis is further supported <br />by reports from mining personnel who state that water is observed <br />issuing from fractures and joints. It is assumed that this leakage to <br />the mine is due to hydraulic connection with North Thompson Creek. <br />• <br />4-119 <br />