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page 4 <br />will be conducted. No retreat mining or extraction of pillars <br />will occur within these limited extraction zones. (Section 4,6,4 <br />and Map IV-7) Minimum pillar sizing necessary to prevent subsi- <br />dence within these areas was developed using analytical techniques <br />developed by A. H. Wilson & D. P,. Ashwin. (Tabl~=s IV-13 and <br />IV-14) <br />Comprehensive subsidence monitoring measures have been <br />commited to by the applicant within the amended application. <br />Bedrock and alluvial aquifers will be monitored by appropriately <br />installed monitoring wells to verify minimization of impact upon <br />the hydrologic balance. Subsidence survey monuments will be <br />installed and monitored quarterly above several representative <br />mine panels in both the Eagle #5 and #'9 mines. Additional <br />subsidence survey monuments will be installed and monitored <br />within and adjoining other areas o£ concern, such as State <br />Highway 13~ the railroad spur and the oil pipeline, (Section <br />4.6.5 and Map IV-7) The monitoring of these survey monuments <br />will commence prior to mining of the panels they overlie and <br />will continue until cessation is approved by the Division, <br />The Division finds that Empire Energy Corporations' mining plan <br />for the Eagle #5 & #9 mines is in compliance with the requirements <br />of Rule 2,05.6(6) and 4,20, <br />