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• structure by structure basis. These estimates continue to be valid for the <br />additional areas included in the revised permit boundaries due to their <br />similarity, limited size, and proximity to the original permit area. <br />The Thompson ranch house and associated buildings are located over the <br />main Southfield mine entries which are designed to provide full support. <br />This area has not been previously undermined by historic mining activities <br />in the vicinity. Since the main entries were developed using a full <br />support design, no subsidence will occur until mining retreat reaches this <br />area during the final stages of mining. However, once pillar recovery is <br />initiated under this area, subsidence is expected to occur. <br />The ranch buildings are situated upon two (2), ten (10) acre surface <br />tracts conveyed to the Thompson's by Robert Jackson and Edward Cribbs on <br />June 16, 1965. The associated transfer of surface ownership included a <br />specific reservation giving the grantor (Cribbs-Jackson) the right to mine <br />the coal and contained an explicit waiver of all rights to surface support <br />and released the grantors from all liability for damage resulting from <br />subsidence. A copy of the deeds as recorded are included in Exhibit 23, <br />• Subsidence Information. Dorchester mined coal from the Cribbs-Jackson <br />property, including the area underlying the Thompson surface, pursuant to <br />a lease executed in May, 1978, between Dorchester and Cribbs-Jackson. The <br />reserved mining rights and subsidence waiver in the recorded deeds <br />constitute valid property rights which were conveyed to Dorchester by the <br />Cribbs-Jackson lease and were subsequently transferred to EFCI. While <br />Dorchester's and subsequently, EFCI's liability for subsidence damage is <br />expressly limited, CMLRD requires monitoring of all potentially affected <br />structures within projected subsidence limits. <br />Damage to county roads within the mine area is expected to be <br />characterized, in extreme cases, by surface cracking or buckling and <br />vertical displacements as a result of subsidence troughs. The locations <br />of these features are expected to occur wherever roads intersect the <br />center portions of the mine panels, and rib side and end lines, with <br />buckling occurring at centers and cracking occurring near rib side and <br />end lines. Measures to mitigate potential damage will include traffic <br />• <br />2.05.6-57 <br />