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~. - TR-48 Adequacy Review Comments Item previously resolved. 2. Response is satisfactory. Note typo (redundancy) in 4th paragraph on amended page ILC-85. 3. Original comment included a reminder that amended B Seam mine plan and schedule would need to be submitted and approved before B seam development commences . Certain information regazding surface disturbance associated with B seam development was submitted in a letter of Apri129, 1997, and in association with TR-46 (B Seam Portal). Updated B Seam Mine Plan Maps (Maps 120 and 135) amended to reflect the mining sequence as described on pages III-6 and III-7 still need to be provided. The second pazagraph under Section III.A on page III-1 is outdated and should be amended to reflect the current status of the B Portal. The mining plan narrative in Section III.A.6 should be updated to cleazly include B seam as well as D seam coal extraction, and the Subsidence Prediction narrative (Section III.A.7.c) should also address B seam coal extraction. 4. Concerns with sediment ponds RP-2/3 and RP-4 aze being addressed through pond cleanout to be completed this fall, and through design modifications addressed in TR-42. 5. The August 20 response letter indicates that Map 19 had been updated to depict a culvert installed to carry flow from the end of the median ditch to the north yazd ditch. In fact, the map shows that the median ditch was extended from its previous point of termiriationr to connect with the South Parking Lot Ditch, with no new culvert installation. This reflects the actual field modification. Documentation needs to be provided demonstrating that the new ditch segment, the South Parking Lot Ditch, and Pond DP-1 aze adequately sized to handle additional flow carried by the median ditch. 6. DMG had requested an updated implementation schedule for the refuse azea drainage control modifications addressed by TR-39. Amended page IV-25A was submitted to address this request, but the schedule addressed therein indicates that the work would be completed by the fall of 1996. This did not occur due to weather conditions. The schedule on page IV-25A needs to be appropriately amended. Also, measures to be employed to prevent gully erosion on the north facing outslopes of RP-2/3 and RP-4 due to seeps or concentrated flow from the active bench surfaces need [o be addressed. A commitment to install temporary erosion control ditches or other appropriate measures is requested. 7. a) Requested survey information provided indicates sufficient topsoil and subsoil material in stockpiles to replace a cover depth of approximately 3.8 feet over refuse material in RP-2/3, RP-4, and RP-SA.