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• with a heavy mulch mat, as soon as possible after the construction is completed. A small <br />area exemption demonstration is provided in Exhibit 66. <br />The fan will be operated 24-hours per day, 365-days per year. Mountain Coal Company <br />has addressed the potential noise impacts of the continuous ventilation operation. <br />Backgound sound level surveys have been conducted and abatements, such as an up-cast <br />cone and mechanical silencers within the fan, are being considered in the fan design. A <br />post-installation sound survey is planned to determine the actual impact, if any, and the <br />need for additional mitigation. <br />Traffic on the road will be controlled by a locked gate. The entire project and traffic <br />patterns will closely resemble the existing Sylvester Gulch fan facility. <br />• <br />Revived April 1995, MR 131 & 133 <br /> <br />