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ZZ <br />Civil & Mining Engineering <br />Engineering Geology <br />Tunnel Engineering & Construction Management <br />SubTerra Rapid Excavation /Support Systems <br />Active /Abandoned Mine Subsidence <br />Quality Assurance / Quality Control <br />Safety Monitoring of Structures <br />Blast Optimization / Vibration Monitoring <br />Mine & Quarry Permitting <br />Material Science / Laboratory Testing <br />Tuesday, April 07, 2009 <br />(0 <br />(0 <br />Mr. Jerry Nettleton <br />Mr. Mike Berdine <br />Twentymile Coal Company <br />Foidel Creek Mine <br />Re: Subsidence Report for the Western Mining District <br />Dear Mike and Jerry: <br />Please find attached the revised subsidence report for the Western Mining District incorporating <br />Mike's comments on the draft document and revisions to the mine layout that have occurred since <br />the draft was issued. Layout changes have had a minor effect on subsidence magnitudes and the <br />conclusions made in the draft report remain unchanged. <br />Thanks for the opportunity to be of service. <br />If you have any questions please do not hesitate to call us at 425 - 888 -5425. <br />Sincerely, <br />Chris D. Breeds, PE, PhD <br />President, SubTerra, Inc. <br />Post Office Box 520, 218 East North Bend Way, North Bend, WA 98045 -0520 <br />Phone (425) 888 -5425 Web Site: www.subterra.us Email: info @subterra.us Fax (425) 888 -2725 <br />