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-41- <br /> XXI. BONDING (2.05.4(2) (b)) <br /> The estimated cost for reclaiming the entire Orchard Valley mine site by <br /> independent contractors has been calculated by the applicant. This cost <br /> estimate includes such items as building removal , sealing of portals and <br /> underground openings, backfilling and grading, topsoil placement, drainage <br /> control, and revegetation. The reclamation costs sections of the application <br /> can be found on pages 78-82, Section 2.05 of Volume 8A, and in the Final <br /> Abandonment appendix of Volume 3. The total cost for reclaiming the Orchard <br /> Valley mine operation has been calculated to be $1,116,500.00. With the <br /> acceptance by Colorado Westmoreland, Inc. of the following stipulation, the <br /> proposed operation is in compliance: <br /> WITHIN 30 DAYS AFTER THE COMPLETION OF PHASE III OF THE STABILITY <br /> ANALYSIS AND REDESIGN OF THE FINAL RECLAIMED CONFIGURATION OF THE <br /> SURFACE FACILITY AREA OF THE ORCHARD VALLEY 'NINE, THE APPLICANT MUST <br /> SUBMIT TO THE DIVISION A REVISED BACKFILLING AND GRADING COST ESTIMATE <br /> FOR THE SURFACE FACILITY AREA. IF THIS REVISED COST FIGURE IS GREATER <br /> THAN THE PRESENT ESTIMATE, THE AMOUNT OF THE RECLAMATION BOND WILL BE <br /> INCREASED ACCORDINGLY_ <br /> XXII. SEALING OF DRILLED HOLES AND UNDERGROUND OPENINGS (2.05.4(2) (g) , 4.07) <br /> Information regarding measures to be used to seal drill holes and underground <br /> openings can be found on pages 99-101 , Section 2.05 of Volume 8A. All <br /> concerns regarding sealing of drilled holes and underground openings which <br /> were raised in the December 2, 1980 and April 27, 1981 preliminary adequacy <br /> reviews of the permit application have been resolved, and the proposed opera- <br /> tion is in compliance. <br /> XXIII. SUBSIDENCE (2.05.6(6) , 4.20) <br /> The original application by Colorado Westmoreland, Inc. (CWI) presented a <br /> subsidence projection based upon: 1) British National Coal Board empirically <br /> derived equations for maximum predicted subsidence and tensile surface strain, <br /> and 2) empirical observations performed by CWI above its existing workings <br /> at the Orchard Valley mine. The application proposed a quarter section corner <br /> subsidence monument monitoring plan overlying the proposed underground <br /> workings. <br /> CWI's subsidence evaluation determined that one structure, an underground <br /> waterline/powerline exists within the potentially affected area. Further, <br /> no renewable resource lands exist within the permit boundaries. CWI's <br /> application demonstrates that the predicted subsidence magnitude and resultant <br /> tensile strains are within the capacities of the pipe and buried cable and <br /> should not result in material damage to the facilities. <br /> CWI's subsidence prediction reflects the current state-of-the-art of subsidence <br /> analysis (see Mining Production Plans appendix - Subsidence Section) . The <br /> maximum predicted subsidence within the permit area is 4.22 feet above the <br /> North 1 Panel between the 8th and 9th East Submains. The CWI amended plan <br /> includes the installation and monitoring of both a quarter section corner <br />