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Subsidence Monitoring Program The applicant references the existing surface subsidence monuments on page 2.05.6(6)-15, and depicts their location on Map tlo. 31, entitled "Subsidence tonitoring". The new application does not contain any details of monument construction. The applicant should include the description and drawings contained within the original application documents. These should be utilized to supplement or replace the subsidence monuments in the future. The application discusses the initiation and conduct of subsidence monitoring, on page 2.05.6(6)-16. The text states; "additional monitoring points will be installed at least one (1) month prior to initiation of possible mining-induced subsidence based on the projected 19° angle of draw. Monitoring of monuments shall be performed at least quarterly, commencing one (1) month prior to initiation of mining beneath any established monument or structure." It is desirable to survey a monument or structure at least twice prior t:o the initiation of subsidence, in order to ascertain whether the monuments are stable and properly installed. This ensures reliable monuments and avoids loss of data. The applicant should amend their text appropriately. The applicant proposes no monitoring plan in relation to the AMOCO Oil Pipeline or County Road 107. It is probable that some monitoring program will be required for these structures, which will be impacted during the initial five year mine permit. 4. The applicant proposes no monitoring 13, the Railroad Spur, or the Yampa associated alluvial valley floors. programs will be required for these lands, which will be impacted during Subsidence Survey plan in relation to State Highway and Williams Forts: rivers and their It is probable that monitoring structures and rernewable resource the life-of-mine. The subsidence survey contained within the application is concise and thorough. In my opinion, the applicant should be commended for this component of the application document. Subsidence Control Plan The application briefly addresses subsidence control for the AMOCO oil pipeline, on page 2.05.6(6)-45. The applicant proposes to undermine the pipeline during the initial five year permit period. As referenced above, I believe the applicant's treatment of this potentially environmentally sensitive structure is far too brief,. The original permit for the Eagle mine complex provided a subsidence controi plan to protect the pipeline from the potentially damaging consequences of surface subsidence. The pipeline was protected through the maintenance of a buffer zone of limited extraction within the Ho.. 5 mine room and pillar workings. Before this sensitive structure can be subsided, the applicant will have to demonstrate that either the pipeline can resist the strains resulting from the proposed life-of-mine activity, or that