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Seprerlxr 2004 BNEn{~ire ri~riatioz * LiabiG'ryRdesseApp'icuziar ~ Pabe 3 <br />2.0 LIABILITY RELEASE REQUEST <br />2.1 LIABILITY RELEASE AREAS <br />Release of liability for surface subsidence effects due to wtdetgrotmd mining is requested for <br />approximately 665 acres overlying the 5 Mine worldngs to the west of State Highway 13. The <br />proposed liability release area, as delineated on Map 1, does not include any alluvial valley floors, <br />croplands, or prime familands. Table 1, Eagle No. 5 Mute - LiabiGry Release Areas, provides a legal <br />description of the subject lands. <br />TABLE 1 <br />EAGLE NO. S MINE -LIABILITY RELEASE AREAS <br />Liability Release Area Approx. Acres <br /> Within Permit <br />T6N, R91 W, Section 31 <br />SW'kNW'k 44 <br />W'hW'FzSE16NW'/a 13 <br />SWYaSWYaNW'kNW'k 4 <br />a portion of the NW'hSWYa 29 <br />a portion of the WYzW'/zNE'kSW'k 8 <br />a portion of the W 3'zSW'/aS W Y< 20 <br />a ortion of the NE'kSW'k 2 <br />T6N, R92W, Section 25 <br />S'/zSE'k 81 <br />S%zN%zSE'k 20 <br />SE'kSW'k 40 <br />E'/zSWY<SW'k 20 <br />S'/zNYzNE'kSW'k 10 <br />S%zN%zEYzNW'/aSW'k 5 <br />T6N, R92W, Section 35 <br />E'/z EYzNE'/a 39 <br />E'/zNEYaSE'k 18 <br />T6N, R92W, Section 36 <br />N'/z less areas outside the permit boundary in the NE'k 180 <br />N'FiSW'k 82 <br />TOTAL 615 <br />2.2 DOCUMENTATION FOR LIABILITY RELEASE <br />Mining operations in the 5 Mine on the west side of State I-Eighway 13 were generally limited to <br />advance room and pillar mining with very limited retreaz mining, so pillars of coal remained behind <br />following completion of reining, to support the mine roof. Conversations with individuals familiar <br />with the 5 Mine operations indicate that the combination of geologic condiions and a massive <br />competent overlying sandstone unit resuhed in very good roof conditions during reining, limiting <br />requirernenu for roof bohing and other ground control measures. Given that the western portion of <br />the 5 Mine was developed and operated during the early 1970's through the earl}F to mid-1980's, <br />cwrerrt subsidence evaluation and monuonng requirements were not yet in place. Consequently, little <br />or no subsidence documentation is available for thu area. Based, however, on both historic <br />descriptions and recent visual inspections, little or no visible surface subsidence has occurred over the <br />5 Mine western worltings. <br />Nom~ally, surface subsidence associated with underground coal mines occurs within 3 months to 3 <br />years of undermining, with little or no subsidence occurring after 5 years. In this case, little or no <br />surface subsidence has been observed over the 5 Mine western worlangs; no mining has occurred in <br />this area in approximately 19 years, and it is approximately 14 yEazs beyond the normal maximum <br />period for subsidence to occur. <br />B7Z/E,grire Crnyrnatim * 29515 RC'R 27 Ckk Gmk, iro 80467 * (970f 8742712 <br />r.F,~~cacw:sam~m~ <br />enero.P,., <br />Reriset - Qzdzr 2004 <br />