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__ -- TUTTLE APPLEGATE, INC. ~~ Consultants for Land and Resource Development Mr. Alichael Boyd Reclamation Specialist Mined Land Reclamation Division February 20, 1940 Page 5 d. The depth and width will also be finalized once construction plans have been completed. The width and depth of a key trench will be a function of the depth of the reservoir and the permeability of the aquifer. Typically a key trench would be dug `~ 3 to 5 feet into the bedrock and range in width from 10 to 15 feet. 6. Due to concerns about filling wetlands, we have removed the internal dike on the reservoir. The mining and reclamation plans have been revised to reflect this change. If we decide to incorporate a dike into the mining plan, we will submit an amendment to the mining plan. 7. Shoreline stability is critical to the integrity of the clay liner and the entire reservoir and will be accomplished by several methods. We do not anticipate these reservoirs being used for rapid drawdown. Therefore, we plan on using buried concrete rubble along the shoreline, log booms, vegetation at the high water line, and the use of filter materials to allow slopes to drain properly. These structural improvements will be a part of the construction plans for the reservoirs and will be submitted to HLRD upon completion. 8. The operator will commit to the SCS recommendations in full. If for some reason in the future there is a need to deviate from these recommendations, an amendment or technical revision will be filed with MLRD. WATER INFORHATION E%HIBIT G 9. The 100 year floodplain is shown on the extraction plan. The discharge is approximately 33,000 cfs. 10. a. The concrete rubble consist mainly of blocks and thickness of this rubble will rubble when buried works as wi durability occurs when it is tends to weather. buried along the river dike will slabs hauled in and placed. The be approximately 3 feet. Concrete :11 as riprap. The only concern on exposed to the elements where it b. 'the rubble dike will be buried with a minimum of 24 inches of overburden and topsoil.