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• mitigation plan acceptable to the SHPO if two cultural <br />resource sites in the vicinity of the road would be <br />impacted. <br />Impacts from the underground mining activities at the <br />McClane Canyon mine, primarily subsidence-related, were <br />analyzed in the 1979 EIS by BLM. The 1979 EIS noted: <br />"The mine should intercept very little groundwater <br />and should have virtually no impact on the ground- <br />water resource in the area.... <br />"Disruption of ephemeral stream channels within <br />the lease area by subsidence and related <br />fracturing would have a very transient effect on <br />runoff. The large volumes of sediment normally <br />transported by runoff would tend to rapidly fill <br />and seal the bottoms of any depressions or cracks <br />thus formed in the steep terrain. Following the <br />completion of mining and reclamation, runoff <br />characteristics of the watershed should rapidly <br />return to essentially pre-mining conditions." <br />The State Historic Preservation Officer concurred on March <br />5, 1992 with OSM's assessment that the minor, if any, <br />• subsidence effects from the proposed underground mining, <br />coupled with the low probability of locating cultural <br />resources in the area above the proposed underground mining, <br />would result in no effect on cultural resources. <br />D. Recommendation <br />Under the Mineral Leasing Act of 1920., the Assistant <br />Secretary, Land and Minerals Management, must approve, <br />approve with conditions, or disapprove the mining plan for <br />Federal .l eases C-0125437, C-0125515, C-0125439. Pursuant to <br />30 CFR Part 746, the Office of Surface Mining Reclamation <br />and Enforcement (OSM) is recommending approval of the mining <br />plan. <br />E. Statement of Environmental Significance of the Proposed <br />Action <br />The undersigned person has determined that the approval of <br />the mining plan would not have a significant impact on the <br />quality of the human environment under section 102(2)(C) of <br />the National Environmental Policy Act of 1969 (NEPA), <br />42 U.S.C. §§ 4332(2)(C), and therefore, an environmental <br />impact statement is not required. <br />This finding of no significant impact is based on the Bureau <br />• of Land Management's 1979 "West-Central Colorado Coal <br />Environmental Statement," two environmental assessments <br />prepared by OSM which identify and discuss the various <br />