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• Volume VII - Geotechnical -Tab 9 <br />Introduction to Terracon Geotechnical Report dated June 1999 <br />Permit revision application No. 3 provides for the construction of a downhill conveyor, <br />construction of a large coal stockpile and the relocation of sediment pond B. The construction of <br />the downhill conveyor includes the construction of a conveyor transfer located immediately above <br />the existing haul road at an elevation of approximately 6730 feet. Construction of the transfer <br />requires the excavation of a bench into the slope immediately above the haul road. Construction <br />of the coal stockpile azea requires the excavation of an approximately 500-foot long, pie-wedge <br />shaped steepened cut slope from 0' to 50' in height. <br />The Terracon geotechnical report was prepared to evaluate the stabihty of the three facilities <br />explained above as follows: <br />Transfer station bench <br />The report found the transfer station bench excavation will be stable during the operation <br />of the mine and after reclamation. The Terracon report recommends an engineering <br />evaluation of actual conditions encountered in the excavation to verify the conditions <br />correspond favorably with the assumptions made in the stability analysis. Therefore, the <br />• Operator commits to the following: <br />An engineering evaluation of actual conditions will be conducted to verify the assumptions <br />used in the geotechnical designs for the proposed excavation work at the transfer <br />structure. This evaluation will be conducted by a qualified geotechnical professional. The <br />evaluation will be performed contemporaneously with the excavation. The Division will <br />be verbally notified of the results of the evaluation immediately following the excavation <br />with appropriate documentation of the evaluation submitted to the Division in letter form <br />within one working week after completion of the excavation. <br />2. Coal stockpile pad cut slope above the pad and below the existing haul road <br />The report found the cut slope above the coal stockpile pad will be stable during the <br />operation of the mine and after reclamation. The Terracon report recommends an <br />engineering evaluation of actual conditions encountered in the excavation to verify the <br />conditions correspond favorably with the assumptions made in the stability analysis. <br />Therefore, the Operator commits to the following: <br />An engineering evaluation of actual conditions will be conducted to verify the assumptions <br />used in the geotechnical designs for the proposed excavation work at the coal stockpile <br />pad. This evaluation will be conducted by a qualified geotechnical professional. The <br />evaluation will be performed contemporaneously with the excavation. The Division will <br />. be verbally notified of the results of the evaluation immediately following the excavation <br />PR-03 - 1 - 10/99 <br />