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Overland Conveyor Geotechnical Investizations (MR04 -11 <br />Site geotechnical investigations are required to support evaluation, design, and possible <br />future construction, operation, maintenance, and reclamation of an overland conveyor which <br />would transfer coal from the Peabody Sage Creek Mine to the Twentymile coal handling <br />facilities. Appropriate environmental clearances for the proposed geotechnical investigations <br />have been completed, as documented by a cultural resource survey report Overland <br />Conveyor Cultural Resources Information (attached), and a wildlife consultation letter <br />(attached). <br />As a result of conceptual design evaluations, a 25 -foot wide conveyor corridor, <br />approximately 8 miles long, extending from the Sage Creek portal area to the Twentymile <br />coal handling facilities, has been defined, as shown on the attached Figure, Overland <br />Conveyor Geotechnical Investigations. Approximately 2.7 miles of the conveyor corridor <br />lies within the PSCM Permit Boundary. The remaining 5.3 miles are within the Twentymile <br />Permit Boundary. As proposed, the overland conveyor, and a light -use construction and <br />maintenance service road would fall within this corridor. <br />The site geotechnical investigations will provide foundation and soils information for <br />evaluation and design of support structures for the proposed overland conveyor. Site <br />geotechnical investigations for the proposed overland conveyor will involve completion of <br />35 to 40 shallow (approximately 10 -30 foot deep) geotechnical test holes along the length of <br />the corridor. Approximately 12 holes will be needed to perform the investigations within the <br />PSCM permit area. <br />An all- terrain drill rig will be used to complete 4 -inch hollow -stem auger sample holes to <br />characterize foundation materials, assess depth to bedrock and groundwater conditions, and <br />to collect material samples for lab testing. All auger -holes will be backfilled with cuttings, <br />leveled, and hand - seeded with the approved rangeland seed mixture, on completion of <br />drilling and sampling. <br />MR04 -11 2.05.3 -E5 - 1 06/11 <br />