RFB-85-27 26007AMLBAML, MUHLENBERG COUNTY

The work consists of an exploratory pit and exploratory drilling to verify the #9 seam coal mine and location of rooms and pillars. During the exploratory drilling phase, AML employees will utilize a downhole camera to verify current conditions in the mine and to determine the extents of the rock and shale fracturing from the mine subsidence. Approximately 400 gallons of water will be required to flush each hole after drilling is complete to improve the performance of the downhole camera. The contractor should utilize a 400-500 gallon water buffalo to ensure adequate water is available and can be used to flush the hole in 10-15 minutes. AML staff will make any necessary adjustments to the proposed hole locations for grouting the coal seam. Six-inch plus diameter holes will be drilled to the #9 coal seam in the specified order. The hole will be cased through the soil horizon into solid competent rock with 6-inch diameter PVC pipe. A box utility trailer with sufficient volume capacity, Non-Woven, Polyethylene Geotextile Sediment Filter Bags or an equivalent system shall be used to capture all cuttings from all drill holes to minimize sediment deposits in the yards. Methane monitoring is the responsibility of the contractor, and if methane is encountered, the contractor must immediately implement a plan to secure the area. This may require the contractor to plug the hole or insert 3-inch diameter PVC casing to a minimum of 10 ft above the ground elevation.