Summary
The work will consist of exploration drilling to verify the # 11 seam coal mine and location of rooms and pillars. During the
exploration 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. Once the exploration phase is complete, 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 #11 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. Approximately 400 gallons of
water will be required to flush each hole. 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 cap the hole or insert 3-inch diameter PVC casing to a minimum of 10 ft above the ground or as designated by the engineer. A subsidence hole measuring approximately 40ft x 45ft across and approximately 5 feet deep is on property owned by Willie Thompson. This subsidence will be excavated to solid and filled with Class II riprap and will be covered using filter fabric and then covered with material removed from the subsidence area. This material will be compacted prior to placing roadway stone back over the driveway. Another collapse was seen in the ditch line to the southeast of the Willie Thompson
residence. This collapse will be excavated out and filled with riprap as well. If mine workings are found in the excavation of
this area a combination of rock and grout will be used to seal up the area to keep water from entering the mine works. Two
potential mine openings on the southeast side of S. Highland Avenue will be closed using wildlife accessible closures as depicted in the AML Standard details and specifications. These openings at the surface are approximately 4 feet across and 2 feet high.
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