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~: ~~~ I~~I~~!~~III~I~ Mountain Coal Company Wes[ Elk Mine Post OHice Box 591 Somerset, Colorado 81434 Telephone 303 929-5015 Fax 303 929-5595 ~` November 3, 1993 Ms. Christine E. Johnston Colorado Division ofMinerals and Geology Office of Mined Land Reclamation 1313 Sherman St., Room 215 Denver, CO 80203 RECEIVED Nov s 1993 Di:~lcic^. ct 91;r.crals ~ Gcc.ony Re: West Elk Mine, Permit C-80-007, Minor Revision 106, Equipment & Materials Storage Bench Mountain Coal Company requests a Minor Revision (No. 106) to Permit C-80-007 to construct an equipment and materials storage area utilizing excess subsoil. Up to 9,000 cubic yards of subsoil excavated from the stacktubes coal storage expansion azea (a.k.a. MR99, topsoil pile relocation area) will be moved to a low, flat predisturbed area to the east, currently designated as a small area exemption (see the portion of Map 54 attached). This area, approximately 18,000 square feet, lies southeast of freshwater pond FW-1 and west of sedimentation pond MB-l. Scrapers would be used to remove, haul and place this subsoil in this area and to build an access ramp from the existing Water Treatment Plant area. One 24-inch diameter CMP culvert is planned to be placed in the FW-1 emergency spillway channel for this access. The original design of the freshwater pond emergency spillway (see page 75, Exhibit 47, Volume 7) shows the peak emergency spillway discharge as 2.7 cfs. The proposed 24-inch culvert is more than sufficient to pass this flow. The subsoil will be placed in lifts of sufficient thickness to obtain proper compaction with the wheel loadings of the scrapers. The estimated finished elevation would be 8 to l2 feet higher than the present elevation of this area. Following final grading, the new storage area would be graveled and the outslopes seeded. Drainage shall be maintained by sloping the area to the southeast corner, and if possible, intercepting ditch D1-3, which runs into sedimentation pond MB-1. If the elevation does not allow for flows for the entire area to be intercepted in ditch DI- 3, the small area exemption demonstration for this area (see Exhibit 66, Volume 8A) showed that the whole area would qualify for drainage exemption with a gravel cover, as well as vegetative cover. Thus, a portion of the area may remain as a small area exemption. Earthen berms will be constructed along both sides of the access ramp and around the west, north and east sides of the new storage area. Any outslopes will be constructed at a 2:1 slope.