Laserfiche WebLink
1�1 1G,,.i.er i V <br />Mid- Continent requested suspension of the subsidence monitoring program on <br />the basis that there is no evidence or likelihood cf damage to or diminution of <br />renewable resource lands or aquifer recharge areas, or to foreseeable use of <br />structures or renewable resource lands. <br />A Technical Revision, approved February 3, 1988, allowed suspension of the <br />semi - annual subsidence monitoring requirement, (See Appendix IV -F -5) on <br />condition that the monuments be re- surveyed at the end of the permit term <br />(1988) . <br />The survey was done in August, 1988. The data compiled are contained in <br />Appendix IV -F -4. <br />In subsequent years (starting 1989) Mid - Continent will make an annual visual <br />subsidence inspection of the area above the Coal Basin Mines which could <br />potentially be affected by ground subsidence. The inspection will be carried out <br />during the summer months, as necessary because of snow conditions. The <br />area will be determined by projecting the boundaries of underground extraction <br />upward from the mined seam to the ground surface along an angle of draw of <br />20.5 degrees from vertical. A report summarizing the results of the annual <br />subsidence inspection will be submitted to MLRD prior to December 31. <br />Prior to implementation of multi -lift longwall mining, Mid - Continent will revise the <br />Collins Subsidence Study (submitted in December, 1985 and contained in <br />Appendix IV -F -4) to reflect the subsidence data obtained during the 1988 <br />subsidence resurvey and any subsequent resurveys. Such revision will be <br />submitted to the Division for review. Such revision will also be done and <br />submitted with any request by Mid - Continent to MLRD for an amendment to the <br />Coal Basin mine plan which involves expansion of the potentially subsided area. <br />In addition, Mid - Continent will provide a monitoring program plan acceptable to <br />MLRD prior to implementation of multi -lii. mining. Tne plan will be submitted in <br />advance of the summer season preceding implementation of the multi -lift <br />program. <br />35 <br />