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The text has been modified to reflect the fact that the cuttings generated from the boring <br />of the Northwest Ventilation shaft will be processed through the prep plant. The cuttings <br />will be blended in with the low quality coal produced at the mine. The blending ratio will <br />be approximately 5 - 10% cuttings to low quality coal. During the conveyance of the <br />cuttings from the mine they were mixed with coal and this will allow Twentymile to <br />recover the coal. The fines resulting from the washing of the cuttings will be pumped <br />underground as part of the thickener underflow disposal process. It is TCC's opinion that <br />the requirement to conduct a stability analysis on the refuse resulting from washing the <br />cuttings be removed due to the fact that the refuse will not be composed of any fines. <br />The text has been revised to provide a discussion on the YVEA line servicing the UP <br />relay overlying the 14 Right Panel. It is a single pole structure and TCC does not <br />anticipate any problems with it. The relay has aback-up power system so that in the <br />event there is a problem service will not be lost. <br />The silencer attached to the IAP fan requires an additional support to minimize vibration <br />of the unit. It will be of the same construction as the structures now in-place. When the <br />site is reclaimed this support structure will be removed. <br />The last item is to add a satellite warehouse/storage site to the list of buildings used by <br />Twentymile. The site is the old wazehouse/shop used by the ranch. It is in a disturbed <br />area and when it is no longer needed it will remain as part of the ranch outbuildings. <br />The revised text and maps aze attached for incorporation into the permit. Also, the bond <br />calculation for the revision indicates an increase in the bond liability of $6,309. Presently, <br />TCC's bond is in excess of what is required; therefore, no additional bond will have to be <br />submitted as a result of this minor revision. <br />If there aze questions, please contact me at your convenience. <br />Sincerely, <br />l~!~!~'~~Gi4 ~~~:~~~/~/ <br />Richard Mills <br />Environmental Manager <br />attachments <br />File:I:en\env\trevision\minorvevision\\mr02- ] 79 cover letter <br />