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PQabody <br />Twentymile Coal <br />~~ ~~~~`9~7/9.38 00 U80467 atl#27 <br />August 1, 2006 <br />Mr. Byron Walker <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303)866-4941 <br />~~~'' ~ 3 2006 <br />Division o/M~narals ena <br />RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR06- <br />209) for Addition of Four 24-inch Culverts on 6-Main North Access Road <br />Dear Mr. Walker: <br />This spring, heavy snowpack and early warming resulted in unusually high runoff and flooding along portions <br />of area drainages, within ow Mine Permit Area. While [he natural floodplains allowed floodwaters to flow <br />outside the normal drainage channels without significant damage, flooding became a concern in certain areas <br />where TCC has constructed and maintains swface facilities and roads. One of these areas is the location where <br />the 6MN Access Road crosses Fish Creek. In this area, floodwaters caused some minor erosion of road <br />embankments, and at one point threatened to overtop the road. <br />In order to address this situation and assure full access to our surface facilities under all reasonable conditions, <br />TCC proposes to install fow 24-inch relief culverts beneath the road. These culverts will be in addition to the <br />existing designed drainage culverts, will be installed above the level of the existing drainage channel and <br />culverts, and will serve solely to safely pass any elevated flood flows in this area. Relevant pemut text has been <br />revised to describe installation and operation of the additional relief culverts, culvert design details are provided <br />as an addendum under TR01-39, Exhibit 8R (Fish Creek Culvert Design, NW Mains Ventilation Shaft), which <br />includes previous documentation on the designed culverts for the original road crossing of Fish Creek near this <br />location. Drainage structwes and culverts are shown on Map 24. <br />We appreciate yow consideration. Once you have had opportunity to review the accompanying information, <br />please feel free to contact me with any questions or to discuss related matters. <br />Best regards, <br />/~~ii~ <br />Supervisor <br />cc: Mike Berdine/TCC <br />attachments <br />