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PQabody <br />Twentymile Coal Company 29515 Routt County Road N27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />TCC will remotely monitor and control reservoir water level, and mine water discharge to and from the <br />6MN Storage Reservoir, to maintain the water level at or below design storage capacities, and to maintain <br />the design freeboard, at all times. Water level and pump control interfaces will provide for integrated <br />control of pumping systems to balance inflow and discharge and shut-off the deep well pump if the pond <br />level reaches a certain pre-set threshold level(s), and an integrated alarm system will remotely notify the <br />operator of any system failure, malfunction, or water level concern. These controls will also assure that <br />adequate storm-water storage capacity is maintained at all times. <br />Electrical power for the 6MN Reservoir discharge pump, aerators, and control systems will be provided <br />by a short(approximately 300 feet) distribution line from the existing substation at the 6MN Shaft pad. <br />Construction of this short line segment will require the installation of 3 powerpoles. Also, a short light- <br />use road, approximately 300 feet in length, will be constructed to the pond pump-station from the existing <br />6MN Shaft pad access road. <br />This submittal includes revised PAP text, exhibits; and maps, addressing the location, configuration, <br />operation, maintenance, and reclamation of the proposed 6MN Storage Reservoir and ancillary <br />installations New and revised PAP materials are identified by the attached Summary of <br />Revisions/Additions. Because the proposed Reservoir storage volume is greater then 20 acre-feet, design <br />and compliance documentation have also been submitted to the Mine Safety and Health Administration <br />(MSHA) for review and approval. We appreciate your consideration and cooperation in facilitating <br />timely review and approval of this revision application. After you have opportunity to review the <br />accompanying information, please feel free to contact me with any questions or to discuss submittal <br />materials or related matters. <br />Best regazds, <br />Twentymile pany <br />Jerry M. N t ton <br />Enviro al Supervisor <br />cc: Mike Berdine/TCC <br />Chris Van Arsdale/TCC <br />G:\Environmental\REVISION\TECH-RV\TR07-61 6MN Storage Reservoir\TR07-61 6MN Storage Resv TL Rl.doc <br />