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• SouthjicGr Mint Minor Revision Request No. 20 -South Fan lnstallatian • 16 <br />in the EFCI permit document. Areas inby the seal will be timbered, bolted, <br />backfilled or otherwise supported to prevent caving which could affect the <br />seal. An MSHA approved sealant will be used on the outer surface of the <br />seal to provide a barrier against water movement. <br />Following construction of the portal seal, the fan portal and fan installation <br />site will be backfilled and graded to provide a minimum of 4 feet of suitable <br />cover over any exposed coal seams or debris with maximum 3H;1 V slopes. <br />Required fill material will be obtained from the temporary stockpile <br />established during site clearing and grading. This material will be <br />supplemented, as neccessary, from an existing overburden stockpile created <br />when the Monarch No. 4 Mine portal bench was established. The location <br />of this supplemental borrow source is shown on the South Mine Fan <br />Installation Map, fMap 30). <br />• <br />Following removal of the temporary stockpile, this area and the <br />supplemental borrow area will also be graded to blend with the surrounding <br />terrain. Temporary drainage control ditches and berms will not be removed <br />during final grading. These structures will be retained to provide drainage <br />and sediment control during the period of vegetative reestablishment. Due <br />to their limited size, these structures will not significantly impact the <br />hydrologic balance and will eventually be eliminated through the natural <br />processes of siltation and erosion. <br />The postmining configuration will not differ significantly from the existing <br />topography as illustrated by the South Mine Fan Installation Postmining <br />Topography and Cross-Sections Map, (Map 31-. <br />• Prior to initiation of disturbance, both the existing portal fill material and the <br />supplemental borrow stockpile will be sampled to verify suitability, sampling <br />results will be submitted to the Division, and the best material will be <br />A (2 /nr. • P.O. 8a+ 771018 • S/eambwv SPnnBr. Cob,ndo 80077 • (30379-6760 <br />