2008-08-15_PERMIT FILE - C1982056A (5)

Home Browse Search

A maximum of approximately 1.0 million cubic yards of un-compacted refuse was 'previously permitted to be temporarily stockpiled in a surge pile at the south end of the refuse area on an area where the topsoil has been ~ removed. Actual maximum placement in this area has been approximately 400,000 cubic yards and this volume has been reduced to approximately 80,000 cubic yards by dozing stockpiled material to an adjacent permanent refuse disposal area. Once the remaining stockpiled material is removed and placed in permanent disposal areas, TCC has no future plans to utilize this area for temporary stockpiling (other than the temporary winter stockpiling, as discussed below). Stockpiled materials are transferred, placed, and compacted on active portions of the refuse area. As the stockpiled material is moved and placed, during the summer construction season, any underlying spoil sub-soil material will be recovered and placed on available completed refuse pile bench areas. During the winter, up to 300,000 cubic yards of material may be tail-dumped on active portions of the refuse pile for temporary storage. In the spring, once any frozen materials are thawed so that effective compaction can be achieved, the piles will be spread and compacted as the next lift on the active pile area(s). The pile will be constructed in 50-foot benches, as originally planned, and drainage will be established off of the pile as presented in Exhibit 26A. 2) Vertical Construction -This segment has been clarified to remove the requirement to construct "A" and "B" segments as proposed in Exhibit 26A. The recommendation presented in Exhibit 26A-1 to compact the entire lift as one unit without dividing it into segments will be followed. This will increase the stability of the fill by removing the potential for establishing a slip plane between segments A & B. As noted in Exhibit 26A-1, the two-segment construction was for "zoned construction" and this is not required for smaller piles. 3) Temporary Road Construction -The temporary road will be filled in with refuse material, as per the recommendation in Exhibit 26A-1, when it is no longer required. The recommendation includes benching and tying in with existing refuse pile to the north and south of this road. 4) Subsurface and Surface Draina a -Small drainage ditches will be constructed downslope of the temporary stockpiles to minimize water running over and down finished slopes of the CRDA. Also, it was recommended in Exhibit 26A-1 that temporary drainage ditches be established along the eastern edge of the benches as they are constructed, to prevent excessive surface runoff from flowing over the finished/compacted slope of the CRDA. The specific recommendations for these temporary drainages are presented in Exhibit 26A-1. Coal Refuse Disposal Area Exaansion - Geotechnical Investigations (]VIR07 226) Site geotechnical investigations are required to provide foundation and soils information for design, permitting, and construction of the Coal Refuse Disposal Area Expansion. The area proposed for the Refuse Pile Expansion is an area of reclaimed mine spoils immediately adjacent and to the east of the existing CRDA, as shown on the accompanying figure. Site geotechnical investigations for the CRDA Expansion will involve completion of six to eight, 4-inch hollow-stem auger sample holes to depths of 20-30 feet; excavation of four to six shallow (ten to fifteen feet in depth) backhoe test pits; and collection, examination, and testing of soil samples. There will be a total of no more than twelve auger holes and test pits. MR07-226 2.05-97.1 ~~~~~~1~,~ F~;;~,t ~ ~ ~~=~3 01/30/08