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<br />-3 6- <br />Stability analyses were provided for the north spoil area, for the worst-case <br />road cross-section, and for the reclaimed facilities area. The stability <br />analyses, based upon a technique developed by Yang H. Huang of the University <br />of Kentucky's Mine Research Center, project an analytical static slope <br />stability safety factor in excess of the required 1.5 for the facilities <br />area. In light of material assumptions made and the absence of underground <br />development waste, the applicant has committed to testing the actual material <br />to verify material strength values. On page 85 of the amended permit <br />application documents, the operator states: <br />"Final design of the spoil pile will be completed when representative <br />samples of the actual spoil can be tested, but before the spoil level <br />reaches the top of the toe dike." <br />Reclamation of the underground development waste pile will be completed by <br />utilizing a portion of the toe dike as cover. Depth of cover was not, <br />specified in the permit application. Therefore the Division deems the <br />following stipulation necessary: <br />Stipulation No. 8 <br />PRIOR TO UTILIZATION OF THE UNDERGROUND DEVELOPMENT 'BASTE DISPOSAL AREA, <br />TWIN PINES COAL COt4PANY, INC. MUST PROVIDE MASS BALANCE CALCULATIONS <br />blHICH DEMONSTRATE THE MOVEMENT OF MATERIAL TO COVER THE 'HASTE DISPOSAL <br />AREA WITH TWO FEET OF NON-TOXIC, NON-COMBUSTIBLE SUITABLE PLANT GRO'dTH <br />MEDIUM IN ACCORDANCE WITH RULE 4.11.4(2). AS A CONSEQUENCE, THE <br />POST-MINING TOPOGRAPHIC MAP h1UST ALSO BE REVISED TO REFLECT THESE <br />CHANGES PRIOR TO UTILIZATION OF THE WASTE DISPOSAL AREA. <br />Upon acceptance of the above stipulation, the Division finds Twin Pines Coal <br />Company, Inc. in compliance with the requirements of this section. <br />XI X. Bonding - Rule 3 <br />The Division has reviewed the reclamation cost estimates provided by Twin <br />Pines Coal Company, Inc. on pages 91-92 of the permit application. The <br />Division has recalculated the bonding estimate utilizing the "Construction <br />Cost Reference Guide", "The Construction Equipment Rental Reference Guide" and <br />"The Means Cost Data Handbook, 1983". The basic assumption is that the bond <br />amount is based on the costs to the Division to contract and reclamation as <br />plan as proposed in Section 2.05.4 of the permit application with the <br />appropriate variations as stipulated in this document. Based on recalculated <br />information, the performance bond shall be in the amount of $54,130.00. The <br />Division has determined this amount to be sufficient to cover the costs of <br />reclamation pursuant to Rules 2.07.6(2)(1) and 3.02.1(1), the performance bond <br />in this amount must be filed with the Division, payable to the State of <br />Colorado, prior to permit issuance. <br />