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i <br />REPORT <br />SUBSIDENCE STUDY <br />PROPOSED LONG-TERtd LEASE AREA <br />ORCHARD VALLEY COAL MINE <br />FOR COLORADO WESTtdORELAND INC. <br />• <br />GEO-HYDRO CO`:SULTING, INC. <br />JOB N0. 102 - 013 <br />JUNE, 1983 <br />u <br />