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52.05 APPLICATION FOR PERMIT FOR SIIRFACE OR IINDERGROUND MINING ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />2.05.6 Mitigation of Surface Coal Mining Operation Impacts. (Cont'd,) <br />(6) (e) (i) (D) The predicted subsidence related phe- <br />nomena which will occur within the per- <br />mit area is an overall lowering of the <br />ground surface, perhaps up to six ft. <br />- In zones of overburden thickness less <br />,i9- than 800 ft. and unfavorable geological <br />~~ ,~9M~_ 1 conditions, tension cracks or compres- <br />c,~ 9Ur1t sional bulges may migrate [o the sur- <br />5~ y, face. A detailed description may be <br />~ ) found in Section 2,05.6(b)(i)(B) and <br />b~ the Subsidence Appendix, Volume 3. <br />(E) In consultation with the Division, and <br />employing research by Dunrud, (1476), <br />Colorado Westmoreland Inc, has used a <br />conservative draw angle characteristic <br />of the permit area of 20.5 degrees from <br />vertical. As information is evaluated <br />from existing monitoring, the angle-of- <br />~y~ draw will be adjusted to a more realis- <br />tic angle, <br /> ` (F) Refer to Map 3-1. <br /> (I) Refer to Map 3-1. <br />(II) Refer to Maps 3-l, 2-4, and <br />2-5. <br />(III) Refer to Maps 3-1 and 2-9. <br />(I V) Refer to Plate 14 of the Geo- <br />Ilydro Consulting, Inc. report <br />in the Subsidence Appendix, <br />Volume 3. <br />(ii) (A) Structures are protected from undermin- <br />ing by lease stipulation. None the <br />less, CWI believes it is technological- <br />ly and economically feasible to prompt- <br />ly repair any subsidence related damage <br />to the condition they caould be in if <br />subsidence had not occurred (refer to <br />Subsidence Repair Portion of the Subsi- <br />dence Appendix, Volume 3). <br />Revised 08/01184 <br />Revised 12/26/84 <br />Revised 10/01/87 <br />153 <br />