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2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />2.05.6 Mitigation of Surface Coal Mining Operation Impacts. (cont'd.) <br />(3) (b) (ii) (A & B) (COnt'd.) <br />approximately 0.6 acres of revegetated disturbance comprised <br />of the fill material and topsoil salvaged during the <br />construction of the West Mine portals (see Volume 8, Map No. <br />8-6, and Volume 8, pages SAE-11 thru SAE-15). Flow from this <br />area is filtered by the vegetation established on the slope. <br />The area currently supports a vigorous stand of grass and forb <br />species with cover conservatively estimated at SOB. Grass <br />filter model inputs describing 3" spacing and 6" height are <br />typically exceeded by the vegetation at this location. No <br />mixing of surface drainage and underground mine drainage <br />occurs within or results from this small area exemption. <br />The Sedcad modeling utilized to describe this site predicts <br />runoff from the site will occur in compliance with the <br />allowable settleable solids concentration. <br />One silt fence is installed on this slope as depicted on Map <br />No. 8-6. The Sedcad demonstration for this are shows that the <br />silt fence is not necessary to meet water quality standards. <br />However, until such time as the Division approves removal, the <br />silt fence will he examined periodically and maintained to <br /> <br />• ensure adequate function at all times. <br /> 3) Orchard Valley West Mine Vent Shaft & Fan Site - consisting of <br /> approximately 1.5 acres of disturbance partially reclaimed <br /> (see Volume 8, Map No. 8-7, and Volume 8, pages SAE-16 thru <br /> SAE-20). Runoff from the site is filtered through the <br /> naturally occurring vegetative filter below the site. The <br /> vegetative filter area is undisturbed, consists primarily of <br /> dense oak brush with grass understory, and has accumulated a <br /> thick, nearly continuous layer of litter and detritus. Cover <br /> in the vegetative filter area is conservatively estimated at <br /> 708. No mixing of surface drainage and underground mine <br /> drainage occurs within or results from this small area <br /> exemption. <br /> The Sedcad modeling utilized to describe this site predicts <br /> runoff from the site will occur in compliance with the <br /> allowable settleable solids concentration. <br /> Removal of the silt fence installed below the disturbed area <br /> was approved by the Division in May 1995. A combination berm <br /> rock filter is constructed immediately below the fan area as <br /> depicted on Map 8-7. <br /> 4) Orchard Valley Mine Training Trailer Area Outslopes - <br /> consisting of approximately 0.3 acres of revegetated <br /> disturbance occupying outslopes of equipment storage area <br /> developed at the Training <br /> <br />MR 95-96 Revised 05/18/95 <br />113a <br />