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Technical Revision No.105 <br />Refuse Pile Expansion, Ventilation Shafts <br />September 27, 2005 <br />Page 2 <br />• Installation of a 4-inch continuously-cored hole at each of the proposed RPE Shaft centers <br />from pad surface to below the B Seam floor; and <br />• Drilling of 3 or more, 3" or 4" diameter, open-augured holes surrounding each of the <br />proposed RPE Shafts to weathered bedrock depth. <br />The engineering data gathered from the 4-inch continuous core will assist in the design of RPE <br />Shafts by providing information on the surface soils, bedrock, coal profiles, and the increment <br />below the_B Seam floor that_will.be encountered during shaft-raising -This hole. will also. be packer.. ___ _ _ _ _ ._ <br />tested to ascertain the existence and extent of aquifers that the shaft construction may encounter. If <br />needed to protect aquifers, these shafts may be grouted to form a grout curtain wall. <br />The 3" or 4" diameter, open-augured holes (three or more in number) in the surface soil to <br />weathered bedrock increment will provide soils engineering data (e.g., bearing strength) and neaz- <br />surface hydrologic chazacteristics information. <br />Mountain Coal Company anticipates that it may initiate these subsurface investigation and <br />characterization activities in 2005 to accommodate design and planning time requirements. <br />We appreciate your consideration and careful review of this submittal and, as always, would be <br />happy to work with you to address any questions or concerns that arise during the review process. <br />Sincerely, <br />1~t~ <br />enry A. azbe <br />Environmental Engineer <br />cc: Pete Wyckoff <br />Phil Schmidt <br />Mike Peacock <br />