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and by a "high -low level" switch inside the water tank. <br />The electric power lines necessary for the operation of this pump system were installed within the <br />permit area and their location is shown on Figure 4.2-3. No additional power lines were <br />necessary. <br />The water was to be directed underground from the water tank through the mine piping system <br />to the mining operations or pumped into the water thickener, which was part of the surface <br />facilities (see 4.3.3.4.2) for use in the surface and underground water system. <br />Since the entire mine hydraulic operation was to be a "closed system", and limited mine water <br />inflow was expected, the entire installation was to perform on an augmentation or make-up water <br />basis. Anticipated daily pump operating time was 10 to 12 hours per day, assuming a pumping <br />rate of 55 gpm. <br />• In general, the steel pipe was laid on the existing ground surface and aligned to avoid disturbance <br />to natural vegetation. Within the facilities area, the pipe was buried at a few locations to provide <br />road access across the pipeline. The pipeline crossed beneath County Road 335 through a <br />culvert. It was determined that reduction in flow by the 2-inch pipe within the culvert is not <br />significant with respect to the total capacity of the culvert (Exhibit 4.3-4) . <br />The steel pipe has been removed from the site. There was no disturbance north of County Road <br />335 associated with the pipeline. The pipeline corridor approximately 400 feet long and 25 feet <br />wide which extends north from the county road to the Colorado River, originating just east of the <br />mine entrance was removed from the permit boundary by technical revision no. 16. <br /> <br />NCIGCoaI Ridge 210.1 4-33 8115!99 <br />