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0abou~ Mining, LLC- Terbnrca/ Renirion TR43 71 Wert Coal Refute Fatilily TerbnirnlAdeguary CammenlJRupon.ter September 5, 2003 page 7 18J Pleare reconcile the different widthr of the haul road ar inditated on page 2.05-29 and page 4 and Figure 13 of the Gratethnital Report. Response: Road width -may vary dependent on terrain and alignment (i.e.: travel-way may be narrowed on very steep sections to minimize cut/fill requirements or may be widened on curves as a safety consideration). In general, the road travel-way will average 30 feet in width. Required safety berms and drainage ditches will add additional width to the overall road surface configuration, with the safety berm being approximately 3 feet high (@1.SH:1V) and drainage ditches varying Ezom 2 to 4 feet in depth (@ ZH:1 V and SH:IV), dependent on design drainage requirements. Road design text descriptions and illustrations have been revised ro reflect typical design configuration. Copies of the revised road design information accompany these responses for replacement in the Mining and Reclamation Plan document. 19f Please reconcile the d ffestintgradieuk of the haul road ar inditated on Dravnng Z.OS-M3 and Figure 10 Response: The road alignment and profile previously presented in the ESC design report represent genera] designs prior to adjustments for road curvature and drainage. The road information in the ESC design report has been eliminated and superceded by the Road Design Addendum. The road alignment and profile shown on revised Maps 2.05-M1 and 2.05-M3 (Sheet 3 of 3) reflect the proposed road design and construction con&guration. Please note that Map 2.05-M3 (Sheet 3 of 3) has been refined to show ground elevation and finished grade, provide more detail relative to changes in road gradient (prior version averaged grades over designated road segments), and to reflect the road configuration where it crosses the existing West Valley Coal Refuse Facility. The-short segment of the IIW Haul Road on the west side of the II West Coal Refuse Facility has also been eliminated, as OMLLC will develop and utilize operational haulage ramps within the refuse pile footprint for construction and refuse haulage as facility development proceeds. This approach is similar to the approach used successfully for construction and development of the existing West Valley Coal Refuse Facility. 20) Pleare include the rpedfication far a grave! wearing rurface of the haul road aver the certifrration of a regirtered engineer. Res onset As indicated on page 2.05-32, haul roads aze typically surfaced with from two to six inches of gravel or crushed road-base material. The nature and type of material used is somewhat dependent on current material availability from local suppliers and sources. OMLLC's objectives in selecting and procuring road surfacing materials is to obtain suitable materials which will provide a durable wear surface and effective surface drainage control at as reasonable cost. To dare, this approach has been successful in maintaining safe operating conditions and minimizing ongoing road maintenance requirements. The Road Design Addendum referenced in the response to Comment 17, includes a statement relative to road surfacing requirements. 11) Pleare include a dermiption ar rpecificatian of the light ure road rarfate. Response: Given that light-use roads will be utilized on an intermittent basis, generally for light- vehicle traffic, these roads will be surfaced with either suitable granular material or a thin (0-2 inches) layer of gravel or crushed road-base material. The road discussion on page 2.05-32 has been revised to include this additional information. Copies of the revised road information accompany these responses for replacement in the Mining and Reclamation Plan document. 22J Pleare provide rpecific nferencer to the geotechnicol demonrtrationr that a minimum rafely factor of 1.5 it maintained for II West Hou! Road cut eloper rteeper than 1.Sh:1v (1.OH:1V cited on page 2.05-29J in uncanrolidated matenalr or 0.25h:1 v (0.3H:1 V Cited an page 2.05-29J in rock. No ruch rut eloper or demanrtrationr were found in the Geotechnital Report (Exhibit 2,05-E4).