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SubTerta, Inc. Twentymile Coal Company 05/31/00 <br />Northern Mining District Subsidence Evaluation -Final Report <br />C~ <br />3.1 Scope of Work <br />The scope of work covered by this section of the report involves an evaluation of potential impacts <br />that may result from sequential lowering of the Energy Spur track during the 5~year mining cycle. <br />The following issues were investigated and resolved: <br />1. What are the predicted magnitudes of subsidence, tilt (gradient), and strain along the <br />Energy Spur for each extraction alternative ? <br />• <br />• <br />2a <br />PN: 98-12 <br />