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Se/nen~n~ 2004 8771 En¢ire Cb/poratim *Li~J~i[ityRdezseAPllr~tim ~ Pabe 3 2.0 LIABILITY RELEASE REQUEST 2.1 LIABILITY RELEASE AREAS Release of liability for surface subsidence effects due to undergrotmd muting is requested for approximately 665 acres overlying the 5 Mine worldrrgs to the west of State Hrghway 13. The proposed liability release area, as delineated on Map 1, does not include any alluvial valley floors, croplands, or prime farmlands. Table 1, Eagle No. 5 Mine -Liability Release Areas, provides a legal description of the subject lands. TABLE 1 EAGLE NO. S MINE -LIABILITY RELEASE AREAS Liability Release Area Approx. Acres Within Permit T6N, R91 W, Section 31 SW'/aNWYa 44 W'/zW'/zSE'/aNW'/a 13 SW'/aSWYaNW'/aNW'/a 4 a portion of the NWY<SW'/a 2944 a portion of theWYzWYzNEYaSW'k 8 a portion of the W'/zSW'/aSWYa 20 a ortion of the NEYaSW'/a 2 T6N, R92W, Section 25 S'YzSEYa 81 SYzN'/zSE'/a 20 SE'/aSWYa 40 E'/zSW'/aSWYa 20 SYzN'/zNE'/aSW'/a 10 SYzN'/z E'/zNWYaSWYa 5 T6N, R92W, Section 35 EYz E'/zNE'k 39 EYzNEYaSE'/a 18 T6N, R92W, Section 36 NYz less areas outside the permit boundary in the NEYa 18024b~ NYzSW'/a 82 TOTAL 615686 2.2 DOCUMENTATION FOR LIABILITY RELEASE Mining operations in the 5 Mine on the west side of State ITigltway 13 were generally limited to advance room and pillar mining with very limited retreaz mining, so pillars of coal remained behind following completion of mining, to support the mine roof. Conversazions with individuals familiar with the 5 Mine operations indicaze that the combination of geologic conditions and a massive competent overlying sandstone unit resuhed in very good roof conditions during mining, limiting requirements for roof boning and other ground control measures. Given thaz the western ponion of the 5 Mine was developed and operated during the early 1970's through the early- to mid-1980's, current subsidence evaluation and monitoring requirements were not yEt in place. Consequently, little or no subsidence documentation is available for this area Based, however, on both historic descriptions and recent visual inspections, little or no visible surface subsidence has occurred over the 5 Mine westem worlangs. Nom~ally, surface subsidence associated with underground coal mines occurs within 3 months to 3 years of undermining, with little or no subsidence occurring after 5 years. In this case, little or no surface subsidence has been observed over the 5 Mine westem worlangs; no mmina has occurred in this area in approximately 19 years, and it is approximately 14 years beyond the nomtal maximum period for subsidence to occur. 8771 E,giire Cwporazro: * 2951 S RCR 27 CLk Crw~, CL 80467 * (970J 870-2712 G£rmdE~ve/10J4LULYVyRd e.d~ 8/18/Olpm Reuss!- O.~tdxr2004