2010-11-19_PERMIT FILE - C1980007 ‎(30)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 11/19/2010
• Doc Name: POND
• Section_Exhibit Name: Exhibit 66 Pond MB-4
• Media Type: D
• Archive: No

The improvements are summarized in the following sections. Design drawings and general notes
are included as Appendix A.
FACILITIES DESIGN
The proposed environmental improvements to the train loadout facility include grading and paving
the facility site, constructing washwater and stormwater collection and treatment facilities,
constructing a containment system for hydraulic oil spills, and providing a permanent storage area
for diethylene glycol.
Site Grading and Paving
The existing and proposed facility site plans are shown on Drawing 1 in Appendix A. Site
preparation work will include initially backfilling the existing sediment pond located east of the
facility. Loose soil and coal particles in the pond will be excavated to expose in -place compacted
soil. The excavated material will be placed in the lower refuse pile at the West Elk Mine. The
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pond will then be backfilled with clean borrow material.
The facility site will be graded and paved with concrete to direct and contain stormwater runoff
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from the paved site, facility washwater, and spills of hydraulic oil and diethyline glycol occurring at
the facility. The grading plan and extent of the "paved containment area" are shown on Drawing 1
in Appendix A. The. paved containment area will extend approximately 20 ft. east of the loadout
facility and approximately 140 ft. west of the facility.
The paved area will be graded at a minimum 0.75% slope to provide adequate grade to convey
water across the paved surface. The area beneath the railroad tracks will slope 0.2 foot over the 8
feet width of the ties to allow drainage below the rails. (Engineering Department, Southern Pacific
Railroad, Denver.) Details of the concrete paving are shown on Drawing 2 in Appendix A.
Rest Elk Mine Train Loadout Environmental Improvements Shepherd Miller, Inc
pA11- 40'Treport1rcport.doc 2 July 1997 (Revised April 19 98)