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and minor cracking may occur. The old shop will be monitored, and if it becomes unsafe, it will be repaired or <br />removed. Ponds SH-Pl and SH-P2 and ditches SH-D2 and SH-D3 will be monitored closely during subsidence. Pre- <br />and post-subsidence surveys and monthly inspections between surveys will be conducted. Any damage will be <br />promptly repaired. The rock dust tank is no longer in use so no effects are anticipated there. The tank will be <br />monitored, and if any safety concerns are identified, it will be repaired or removed. No facilities except an empty <br />water tank are located at the contractor staging area, so no effects are anticipated. The trailer at the storage and wood <br />shop will be monitored in insure that it does not become unsafe. The Okie Plaza well will not be undermined until a <br />revision is approved by the Division for elimination or replacement of this monitoring well. The underground <br />facilities to be undermined wilt be underground development entries. The No. 5 Mine mains and submains will be <br />located over development entries (mains and submains) of the No. 6 Mine. The No. 6 Mine development entries are <br />designed to remain stable for the life of the mine. These areas have been protected against subsidence damage by <br />ensuring that sufficient coal has been left in- place as pillazs to prevent subsidence in these areas. They are located <br />outside the angle of draw of the planned mining. Therefore, there will be no subsidence impact on these structures. <br />Longwall mining in [he No. 6 Mine is planned under old room-and-pillar workings of the No. 5 Mine. The worst <br />possible consequence of longwall mining would be that the pillars in the old workings will fail and the roof caves. <br />This would effectively increase the magnitude of subsidence a[ the surface. Because multiple-seam mining generally <br />occurs where the surface is rangeland and wildlife habitat, the worst possible consequence of subsidence will be <br />minimal. <br />Private Residences (Houses). There are three-(3) private residences located within the permit area. The structures are <br />located outside of the planned five- (5) year mining area (1998 -2003). There is no possible adverse consequence of <br />subsidence with respect to residences. Since both structures are located outside [he planned five- (5) year mining area <br />and located outside of the area of subsidence influence, the structures will be protected from any subsidence-induced <br />damage. <br />Oil Ppeline. It is anticipated that subsidence effects may necessitate repairs to the oil pipeline. A general lowering of <br />the ground surface with grade changes and surface cracking may occur along the pipeline right-of-way. The AMOCO <br />Pipeline Company, which owns [he pipeline, maintains a continuous pressure monitor on the pipeline from its offices <br />in Tulsa, Oklahoma. If disruption of flow were to occur, the monitor will be triggered and action will be initiated to <br />locate and repair the ruptured line. <br />EC has established communications with Amoco Pipeline Company to determine the most practical means to <br />mitigate any adverse impacts, which may occur to the pipeline due to proposed mining operations. Potential solutions <br />include relocation of the pipeline, in-place activities necessary to protect the pipeline if left in place, and redesigning <br />mine plans. EC, in co-operation with Amoco, intends to conduct full extraction mining operations beneath a limited <br />segment of the pipeline, upon approval by CDMG. Within the pas[ (5) year permit term of this application, the only <br />prior area of concern was longwall panel No. 2 of Mine No. 6 ("E" Coal). Amoco moved the pipeline around the end <br />of longwall panel No. 2 as shown on revised Map 24. This insured a 100-foot buffer was maintained per the previous <br />permit commitment, and allowed maximum coal recovery from this panel. The depth from surface to bottom of the <br />"E" Seam at this location was 200 feet. The angle of draw is calculated to be 19 degrees. 100 feet horizontal distance <br />was a conservative figure [o assure no subsidence effects given the above data. <br />For the segment overlying Panel #3, EC has reached an agreement with Amoco, wherein Amoco has agreed to allow <br />EC to undermine the 6" diameter crude-oil pipeline which traverses the EC mining area. Under terms of this <br />agreement, EC will reimburse Amoco for EC's share for work performed by Amoco or an Amoco contractor to <br />install a section of new pipe in the area to be undermined, and for the burial of the pipeline segment upon completion <br />of undermining. EC will be responsible for handling of the pipeline during the undermining (during which time the <br />pipeline segment in question will remain uncovered, to allow monitoring and temporary support adjustments as <br />needed), and will have [he pipeline periodically inspected by Amoco personnel. <br />EC has, in cooperation with Amoco, developed the plan for undemvning the pipeline in a manner, which should <br />Permit Revision 04-34 2.05-52 Revised 7/2/04 <br />