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Y !7 ~~ ~~ ~~ . TUTTLE APPLEGATE RINDAHL, INC. Consultants for Land and Resource Development Mr. Michael Boyd Mined Land Reclamation Division August 16, 1989 Page 3 3. Sediment and Siltation Structures - As per hydrology/erosion control (see above) sedimentation basins will be constructed at each drainage outlet point from the proposed mining areas. Each sedimentation basin will be designed to retain a two-year storm event. These siltation areas will be ~ maintained by excavation and regrading as they begin to fill / up with sediment. At the conclusion of mining the sediment basins will be used for small stock ponds to enhance the post-mining utility of the property as rangeland. 4. Phase III Mining Area Drainage Outlet - An additional drainage outlet area has been added to the preliminary ,k~ drainage plan and reclamation plan (Exhibit F) at the northern most point of the Phase III mining area. Thank you for your comment. 5. We are agreeable to include several permanent stock ponds in our final reclamation plan. We think the sediment ponds for °j erosion control will be suitable far these stock ponds. 6. We are agreeable to include Snowberry and Fringed Sage in ~ our proposed seed mix. ~ 7. We are agreeable to redistributing a 12 inch layer of L material which will include topsoil, B horizon and C horizon °i overburden material. Water Information (Exhibit G) 1. Haul Crossing of Willow Creek - Please find enclosed drainage information regarding Willow Creek. This information includes a CUHP runoff analysis for the Willow Creek basin encompassing approximately 2.88 square miles tributary to the crossing point. Also included are hydraulic calcs for culvert sizing indicating that triple 30 inch diameter CMP culverts at 3~ slope or double 36 inch diameter CMP culverts at 2-1/2~ slope are adequate to convey the irivey_ypar one hour storm event peak flows without ~/ overtopping. a