RFB-108-27 25035AMLBAML, HOPKINS COUNTY

The project consists of backfilling approximately 2000 linear feet of mining highwall and eliminating approximately 14 acres of mine pits. Some pits will be backfilled with adjacent onsite mine spoil material as part of eliminating the mining highwall. The designated highwall areas will be backfilled at slopes no steeper than 3h:1v using adjacent mine spoil. The pits will be capped with the best material available on site. Some pits will be used in the construction of long-term water treatment cells to reduce acid mine drainage. The water in all pits will be treated and raised to a pH of 6 or greater prior to release in accordance with KYDAML Technical Specifications. Acidic spoils adjacent to the pit shall be used first in backfilling the pit to eliminate the acid forming potential of these materials. Acid mine drainage treatment cells will be constructed in the northern number nine coal seam mine bench utilizing the existing mine pits. The treatment cells will be built according to AML technical specifications and will include limestone sand, straw/hay, compost/manure and hardwood bark mulch or equivalents. Barren coal refuse, unvegetated fireclay and/or coal slurry pits are included in this project and will be reclaimed. Adjacent spoil piles will be graded, and spoil material will be pushed over the refuse/slurry/fireclay areas. Limestone Sand and/or Agricultural Lime will be applied to some areas prior to covering with spoil. A borrow pit is shown on the plans for borrow material and this material will be transported by truck to the #11 mine bench and used as final cover material. Borrow Material will be paid for as shown on the bid schedule for Earthwork Borrow Material on a cubic yard basis for material hauled in a truck from the designated borrow area to the final placement area. Blasting will be required.