PERMFILE43358 - Laserfiche WebLink

Home Browse Search

• In order to provide 10 feet of access at the rear of the building, RAG EC proposed to remove approximately 2,000 yd3 of material from approximately 11,200 ft2 of slope behind the building. The entire area has previously been disturbed, and the removal of this material resulted in only a slight increase in mean slope from 43% to 48% (longest cut slope 75'). The material removed was placed in the existing rock storage area, shown on Map 26 and discussed in Vol. 10, Exhibit 40. The rock storage site is permitted for 12,000 yd3, and still has room for 4,600 yd3 before the 12,000 yd3 is reached. Therefore, the 2,000 yd3 from the cut will easily fit in this area. This material will be placed as discussed in Exhibit 40. This volume of material (2,000 yd3) is less than I % of the total volume of overburden to be moved during final reclamation (290,000 yd3), and is not being removed from SA area, so final contours are not being adjusted. Livestock Ponds RAG EC submitted Technical Revision Number 7 for the Division on September 10, 1987 detailing the plans for installing livestock ponds. This revision has been placed in Exhibit 41 of the permit. Haulage and Access Roads The location and classification of all roads used at RAG EC mine site is shown on the Roads Map (Map 27). RAG EC, in agreement with Moffat County have taken responsibility for these roads. Included in Exhibit 17, Road Certification, is correspondence, which identifies the roads, which have been vacated to RAG EC. The performance standards of Section 4.03 for the various roads at the Eagle mine complex are met by the following: • County roads, maintained by RAG Empire, and all other roads are subject to the BACT requirements of RAG Empire's Air Quality Permit. • Roads to be reclaimed are subject to the post-mining land use requirements as set forth in this permit. • • All roads are designed and maintained to ensure the safety of the public through proper grades, cuts, fills, and so on. In order to determine compliance with the CMLRD performance standards, the engineering company of CTL- Thompson, Inc. was requested to evaluate all access and haulage roads on the RAG Empire property. The report issued by CTL-Thompson, Inc. verified that all roads utilized by RAG Empire are in compliance with the performance standards. The CTL-Thompson, Inc. report is included in Exhibit 17, Road Certification. As per Map 27, there are a number of haul roads associated with the mine complex. Although the haul roads have been used mainly to transport development waste and coarse reject from the rotary breaker to the waste disposal areas, they were designed and maintained to haul road requirements. Figure 56A provides a typical cross-section through haul road A. Haul road A will be utilized to transport coal from the existing coal handling facility to its intersection with County Road 107. Moffat County is allowing RAG Empire to use County Road 107 for coal haulage. Haul road A is apre-existing road that was built prior to the enactment of the Surface Mining Control and Reclamation Act of 1977. The road was constructed in accordance with accepted road construction practices, and as such culverts were placed in the various drainages the roads crossed. Map 27A shows the road location, and Figure 56A provides a typical cross-section. Peak flow information obtained from Trapper Mine's permit document indicates the peak flow in West Buzzard Gulch is 178 cfs, while the East Buzzard Gulch peak flow will be 13 cfs from Trapper's pond (East Buzzard # I R). Presently, 16-inch CMP pipe is in place in both of these drainages. Also, a 16-inch CMP is in place in an unnamed tributary east of East Buzzard Gulch. • RAG Empire's calculations indicate that the West Buzzard Gulch culvert should be 60 inches in diameter, while the East Buzzard Gulch culvert should be 36 inches in diameter. The eastern most culvert is more than sufficient to handle the runoff from the small drainage area. This culvert will handle a peak flow up to 13 cfs. Dense vegetation is established at the inlets and outlets of the culvert. Therefore, rock headwalls will not be constructed. MidTerm Response 2.os-17 APPROVED MRR i ld 12 os~ol ~t~~~