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e <br />ESPEY, HUSTON b ASSOCIATES, INC. <br /> <br />CHAPTER Y: PERMANENT PERFORMANCE STANDARDS <br />The following is a listing of the U.S. Office of Surface Mining, Colorado <br />Division of Mined Land Reclamation, and U.S. Geological Survey Permanent <br />Performance Standazds for underground coal mining. Following each regulation <br />number is an index which provides narrative information or where the regulation is <br />addressed in this application. Before reviewing this chapter, please refer to Chapter <br />A, Section 2.O,Introduction. <br /> <br /> <br />Y-1 <br />