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4 • • I - -ya ~ 2 the hydrology report, determinations of the peak flows in the East Roatcap Creek drainage using the SCS Curve number method. ..For the design of the culvert, the SCS curve number method would be more reliable, if the values of the various input parameters were carefully selected. ' I 4. Section 2.05.6(3)(b)(i)5, last paragraph: We request that CWI explain what actions will be taken if the culvert capacity is exceeded, or if the culvert becomes clogged with debris during heavy runoff. We also request that CWI show the risk involved, considering the mine life, in the capacity of the culvert being exceeded. ' 5. Section 2.05.3(5), 2.05.4(2)(a)„and 2.05.4(2)(e)(iv) - We request that the stripped vegetation be chipped, or lopped, then scattered over the seeded areas. Do not mix in large pieces of woody material with stored topeoll or during reclamation. 6. There is a great deal of detail ~ncluded for the fill areas around the portal bench. For the cut bank of the portal bench, please include in the application detail on how the cut bank will be stabilized, revegetated, and what erosion prevention methods will be used, and detail as the }he credibility of the cut banks 'being stable'. 7. The application should require that waste or excess borrow from cuts be end-hauled and not be sidecast onto fill slopes of the bench or haul road areas. .I 8. There are several inconsistencies in the soil report - Appendix B. A moderately deep phase is described for Delson series on profile no. 2CW. Deleon series fannot be moderately deep. A shallow phase is described for Shraton series on profiles 1CW, 11CW, 12CW, 13CW and 14CW. Saraton series cannot be shallow. In both cases there are sails in the survey area that would be better for the profiles. Likewise, profiles 3CW, 4CW and 8CW do not qualify as Delson series because they are not in the fine textural family. i i 9. The proposed reclamation stipulation to spread topsoil only 1 foot thick on disturbed areas islinadequate. The Delson series soil that presently occurs on 86% of the area to be disturbed is ' over 5 feet deep. All horizons of this soil are rated. excellent- for reclamation material. We suggest and request that a minimum of 3 feet of topsoil be used forireclamation to restore the pre-mining soil and productivityof this area.