Laserfiche WebLink
Bondine/ Reclamation Cost Estimate Considerations <br />The anticipated additional road disturbance for access to the eleven boreholes will be <br />approximately 6,482' in length (2,132' new construction and 4,350' reopened road) by 10 <br />- 14 feet (avg 12') wide or a total of 1.78 acres of additional disturbance. The pads will be <br />approximately 80 feet wide and 130 feet long or 0.24 acre each. Total pad disturbance <br />will be approximately 2.64 acres. Total borehole footage is estimated to be 20,805'. <br />As in the past, we are requesting that the Division prepare a cost estimate to complete the <br />total of 4.42 acres of reclamation activities. <br />Borehole Completion <br />Each borehole hole will be drilled 8'/< inch diameter to approximately 20 feet above the <br />coal. 7 inch steel casing will be installed to about 50 feet above the coal. Approximately <br />100 feet of slotted 5 inch liner pipe will be installed to the bottom of the borehole <br />extending up into the 7 inch casing approximately 50 feet. <br />Drainage and Sediment Control <br />The drainage and sediment control system for the Elk Creek mine gob vent boreholes will <br />be consistent with the previously constructed Sanborn Creek Mine gob vent boreholes. <br />The drainage and sediment control for the Elk Creek Mine borehole sites will be <br />managed as a small area exemption with alternative sediment control provided by a <br />combination of perimeter sediment control berms/ditches and installation of straw bales, <br />straw waddles or silt fence, etc. to reduce flow velocity and trap sediment. To facilitate <br />the control of upland drainage, if the site is suitable, an upland clean water diversion will <br />be constructed to reduce overland flow into the effected area. Permit Map 2.05-M4 (4"' <br />sheet) Drainage and Sediment Control Plan provides a typical example of a drill pad lay <br />out. Exhibit 2.05-E3, Drainage and Sediment Control Plan, Section 9, Revised and New <br />SAE's and Alternative Sediment Controls provides typical designs and demonstrations for <br />alternative sediment control and clean water ditch scenarios. Exhibit 2.05-E3, Drainage <br />and Sediment Control Plan, Section 6 contains information regarding mudpit hydrology <br />demonstrations. <br />