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2.05.4(2) • (e) Plan for Revegetation The area will be revegetated in accordance with the revegetation plan contained in Appendix H. ' (f) The debris remaining after the dismantling and removal of the surface structures and equipment will not include the noncoal materials described in 4.11.4. The Operator will not dispose of any materials that will constitute a fire hazard in this area. Waste oil generated by the operation will be temporarily stored in an above ground waste oil tank, located near the shop/warehouse, then periodically picked up for disposal by an approved waste oil service. Waste paper, lumber, pipe, supplies, cardboard etc. will be accumulated in the east storage yard then periodically transported to the Delta County landfill for disposal. Scrap steel will be stored in an area provided near the dump station then periodically picked up by a salvage company. The Operator has accumulated 17 barrels of excess material that are stored in a metal storage building. The material stored in the barrels includes paint, hydraulic oil, solvent, firefighting foam, sealing foam for stoppings, cement hardener and wetting agent (soap). Most of this material is considered excess. The metal building has a metal floor with a 6-inch steel lip enclosure which provides a spill containment capacity (secondary containment) of 54 cubic • feet (9.4' X 11.5' X 0.5'). After removing the volume of the barrels that take up part of the containment volume, the net secondary containment volume is about 30 cubic feet. Generally, secondary containment should be provided for the entire contents of the largest single tank in a storage area plus precipitation which is not applicable to this covered storage building (Ref 40CFR 112.3). One 55 gallon barrel contains 7.4 cubic feet therefore the metal storage building satisfies the secondary containment requirement. Since this excess material contained in the 17 barrels is stored appropriately, the Operator does not have•any immediate plans to dispose of it. The location of the noncoal waste storage areas are shown on drawing E-3207R. (g) Sealing of Mine Openings The three portals will be sealed in accordance with Drawing A8-1367. A solid block wall will be built a minimum of 25 feet back from the portal entrance or a greater distance if required to find suitable competent rock. A backfill of broken rock, gravel road surfacing material and other coarse material will be placed outby the seal. • 2.05 - 37iii Rev. 1:11-25-92