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Third Adequacy Review-TR #63 July 6, 1993 6.0 SURFACE HYDROLOGY Page 2 1. Page 23 has not been corrected to specify that ditches and diversions were designed for the 100 year, 24 hour storm event. Please provide this revised page. 2. No further response is required. 3. The clarification of the location of the ditches is helpful. As there is currently no ditches named D6-3 and D6-4, the associated designs for these ditches and locations on Map 54 should be included in the review of Technical Revision No. 64. 4. As this question deals with mine site hydrology, it will be resolved during Technical Revision No. 64. 5. The revised paragraph describing MB-6 is adequate at this time; however, this issue must be resolved during Technical Revision No. 64. This is necessary until the redesign of MB-6 is implemented. No further response is necessary at this time. 6. As this questions deals with mine site hydrology, it will be resolved during Technical Revision No. 64. 7. The paragraph to include the riprap gradation information is acceptable. No further response is required. 8. The verification from Envirocon, which states the diversion berm will adequately divert the runoff from the 100-year, 24- hour event should be incorporated into Exhibit 51. The table of contents should be updated. 9. The paragraph which commits to maintaining positive drainage on the south side of the refuse pile is adequate. No further response is required. 10. Ditch D6-4 should be shown on Map 54 and designs should be provided. As this request deals with mine site hydrology, it will be resolved during Technical Revision No. 64. 7.0 ROADS 1. Figure LWP-O15A will be incorporated into Appendix M. No further response is required. 2. Figure LWP-019, "Plan and Profile sheet and Cross Sections, Temporary Realignment of Sylvester Gulch Road", will be incorporated into Appendix M. The other Figure LWP-019 will