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D. T. Mathews - 2 - June 5, 2000 upper diversion ditch PCC plans to excavate a channel in the natural ground north of the pile. The channel will be below the level of the refuse, approximately 10 feet below at the outlets. This design will minimize the risk of run-off overtopping the channel and eroding the pile. Pages 14-10 & 11 were amended to include a discussion of new Exhibit 60. Page x of the table of contents and Tab 13 table of contents list Exhibit 60 and are enclosed. Replacement pages CRDA2-12 through 13k (Appendix 13-2) present the revised run-off calculations and design for the CRDA-2 upper diversion ditch. 7. No changes are anticipated to the reclamation plan at this time. The discussion on page 14-1 states the start of "Year 1"maybe up to 1 year past the end of final shut down to allow for final engineering, permitting and job bidding. Therefore, year 1 on Figure 14-1 is the year 2001. 8. The reclamation plan revisions included with this transmittal should not effect the current reclamation cost estimate. 9. The reclamation plan, page 14-13, was amended to remove the rock check dams from coal canyon and harvest the sediment so the channel has an approximate uniform grade. This activity will benefit the reclamation of CRDA No. 1 & 2 because it provides an additional source of subsoil and rock for rock groups. I do not believe the reclamation bond will need to be amended for this reclamation activity. A close evaluation would likely show a savings in the reclamation cost since the harvested subsoil is closer to the refuse piles than the subsoil from CBA No. 2. 10. PCC asked the BLM if it is interested in keeping the large diameter culverts in place to facilitate access to public lands. The BLM has not responded to the request. PCC will address the reclamation of these large diamater culverts after the BLM responds. 11. The cheatgrass infestation issue is addressed on amended page 14-14. 12. Enclosed is amended Exhibit 11 C which shows the alternate sediment control measures to be employed during reclamation after the sediment ponds at the unit train loadout are removed. Also enclosed is a Sedcad demonstration (new pages 14-6-19 through 14-6-34) which indicates the silt fences and berms shown on Exhibit 11C will ensure compliance with the effluent limitations of 4.05.2. Also enclosed is amended page T13-5-2 which lists the unit train loadout after reclamation when the sediment ponds are removed.