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Peabod <br />1111 ENERGY <br />Twentymile Coal, LLC <br />Mr. Jared Ebert <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />303.866.3567 X8120 <br />REG�1v�® <br />X16 <br />of Reda ety cn, <br />p"nSM fiin9 & Sa <br />Re: Minor Revision MR16-299, Second TORT Pipeline <br />Dear Mr. Ebert; <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />June 16, 2016 <br />With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision <br />(MRI6-299)to our existing approved Mining and Reclamation Permit, for the installation of a second <br />pipeline within the existing IORT Pipeline corridor. The new pipeline will run from the IORT/ 6MN <br />junction paralleling the existing IORT pipeline and tying back into the existing mine water return <br />pipeline past the Barricade Chamber. The new pipeline will consist of approximately 6,590 feet of <br />buried 10 -inch HDPE pipe at a depth of 5 feet to 6 feet below the existing grade. An 8 -foot diameter <br />CMP riser will be installed along with the pipeline for valve control access next to the excising CMP <br />riser at the junction of IORT/6MN pipeline and the existing TORT pipeline. The water transfer <br />pipeline, and associated valving will allow transfer of water from the Wolf Creek Reserve mine <br />workings and the overlying accumulations of water in the sealed and abandoned Wadge Seam <br />workings to be transferred to the existingmine water handling system. The additional IORT pipeline <br />will also provide additional flow capacity, while limiting operation pressures when pumping from <br />multiple locations. <br />Installation of the second pipeline will parallel the existing IORT pipeline and will take place within <br />the existing l ORT pipeline corridor. There will be no new disturbance for installation of the new l ORT <br />pipeline; therefore, further environmental assessment was not necessary. In addition, the existing <br />reclamation cost estimate from the existing IORT pipeline will still be valid due to no new <br />disturbances, therefore, no further cost estimates for reclamation will be necessary. <br />All piping will be 10 -inch thermally fused High -Density Polyethylene (HDPE) pipe, and will be buried <br />a minimum of 5 -feet deep so that it is below the normal frostline. An 8 -foot diameter CMP access riser <br />will be installed to protect the associated valves and provide inspection/maintenance access. <br />Installation of the additional TORT Pipeline and access riser will involve placement of construction <br />erosion controls (silt fence and/or straw wattles), removal and windrowing of soil materials; <br />excavation, placement, and backfilling around the risers; trenching in most areas for pipeline <br />placement; placement of suitable bedding materials; placement, connection, and pressure testing of the <br />pipeline; backfilling and compaction of suitable fill materials around and over the pipeline; backfilling <br />and compaction of the trench; regrading; replacement of soil materials; and revegetation of all <br />disturbed areas. It is not anticipated that any of the planned activities will occur within stream buffer <br />zones. <br />