2007-11-22_REVISION - M1997054 - Laserfiche WebLink

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8) The Division finally received on 11/7/07 the Tallahassee river flood study provided to FEMA. Under the current condition, there are two bridges that were constructed over the creek to carry a road to the sandstone quarry and the rail spur of the granite quarry. The Division never received the design for the bridges. Are these bridges permanent structures approved by either the Army Corps or the County ? If the bridges are going to be temporary, the Division will need the detailed design so the warranty can be calculated to remove and reclaim the area affected by the bridges 9) Does the operator plan to construct additional berms along the Tallahassee creek. Please provide a typical design for these berms so the warranty can be updated for removing and reclaiming the area after mining is completed. 10) According to the current mining plan, the mining face will be nearly vertical 1/2 H:1V as is currently done. Dewatering trenches will be excavated around the perimeter of the mined area. What is the design size for these trenches, please explain and provide a typical design, showing length, width and depth of these trenches, so the warranty for removing them can be calculated. 11) The operator proposes to place a storm water pond for the granite quarry North of the proposed faculty. Please provide the details for the pond. No design was submitted Does the warranty calculation for the ponds include this one too ? How is the storm water conveyed to this pond Please explain and provide the details for the pond showing how drainage is conveyed. Based on exhibit C-2, this are is outside the proposed mining limit for the quarry. 12) Are there going to be any permanent structures that will be placed in the proposed Quarry's processing facility area ? Please provide the details, if not included in the warranty calculations under exhibit L. 13) The operator states, mining and reclamation of the quarry will be in four phases. However, Exhibit C-2 mining plan map only shows three areas. Also under Exhibit L, reclamation cost estimate, the operator summary only shows Phases I thru III for both the quarry and the sand and gravel operation. Under the quarry mining plan there is a Phase IV mentioned as the continuation of excavation in all areas and development of benches and high wall Please explain. 14) Operator states, "the configuration described for all phases are the most aggressive. Configuration are likely to be practical from a geotechnical perspective. Less aggressive configuration are possible as more field information is gathered". Did the operator conduct adequate geotechnical investigations for the proposed configuration ? Please provide the data for our engineering staff to review and comment. 15) Operator states, Benches and high walls above 5800 feet elevation for the quarry, will be developed by leaving intentional short breaks in the high walls and leaving diagonal haul roads in place in an attempt to break up the horizontal lines created during standard high wall and bench mining. These breaks will be reclaimed by backfilling". How wide will these breaks be ? Exhibit D-1 shows the breaks but no dimension is given. Please explain. 16) Operator states, "Front Range Aggregates will perform an experimental/ trial excavation well with in the mining limits in order to observe the actual performance of the benches and high walls in multiple orientations. This trial excavation will establish the basic design for the benches and high walls. Evaluations and changes to the high walls and benches will be made as necessary over time based on continuous observations of benches and high wall performance. The Division understands the need might arise to change the mining plan after the commencement of mining However, the operator must understand 3