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-3- <br />Stipulation IVo. 5 <br />U.S. STEEL SHALL SUBMIT A DEMONSTRATION THAT THE PROPOSED <br />POST-MINING CONTOURS OF ALL AREAS FOR WHICH THEY HAVE APPLIED <br />FOR A VARIANCE FROM THE AP PRUX114ATE ORIGINAL CONTOUR RESTURATIUW <br />REQUIREMENTS, WILL BE STABLE WITH A STATIC FACTOR OF SAFETY OF <br />1.3 WITHIN 12U DAYS AFTER PERMIT ISSUANCE. <br />Stipulation No. 6 <br />U.S. STEEL SHALL SUBMIT A STUDY OF NOISE LEVELS, NOISE SOURCES, <br />AND METHODS (if any) THAT COULD BE USED TO MITIGATE NOISE <br />IMPACTS (if any) AT THE PROPOSED S014ERSET VENTILATION FAN ALONG <br />HUBBARU CREEK PRIOR TO THE CONSTRUCTION OF THE FACILITY. THE <br />STUDY SHALL BE CONDUCTED IN CONSULTATION WITH THE USF5, OSM, ANU <br />THE UIVISIOIJ. U.S. STEEL SHALL IMPLEMENT NOISE ABATEMENT <br />MEASUKES (if practical) THAT ARE RECOMMENDED IN THE STUDY ANU IN <br />CONSULTATION WITH THE U.S.F.S., O.S.M., ANU 7HE DIVISION WITHIN <br />9U DAYS AFTER COMPLETiUN OF THE FAN FACILITY. <br />