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• Exception: In accordance with 30 CFR 211.31 and 30 CFR 817.121 <br />`' " ~ sv ficient coal Hill be left in-place in Pine Gulch to prevent <br />~' subsidence, so there will be no substantial threat of loss to• <br />people or property and to the natural and beneficial values of the <br />Yi' ~ floodplain on the lease tract and downstream. <br />Criterion Number 17 -- Municipal Watersheds <br />Anatys~s: None of the land referred to in this document is used as <br />a mun~c~pal watershed. - <br />- ~ "~ <br />Criterion Number •18 -- National Resource Waters <br />Anal sis: None of this area has been designated by the State of <br />0 orado as National Resource Waters. - <br />Criterion [umber 19 -- Alluvial Va11ey.Floors ~. <br />Analysis: The upper reach of Pine Gulch, within the proposed lease <br />are- a des not constitute an alluvial valley floor. However, this - <br />- criterion may apply below the lease area where Pine Gulch merges <br />into Nay Gulch. The appropriate mitigation will be necessary to <br />maintain the integrity of flow in Pine~Gulch over the lease area. <br />~' <br />Criterion Number 20 -- State Criteria <br />Analysis: No State Criteria have been proposed or adopted by <br />Colorado. <br />..~ <br />• <br />Summa r <br />It is the conclusion of the unsuitability analysis that no part of the <br />160-acre site is unsuitable for mining operations. Subsidence which <br />would affect water discharge rates, water flow patterns, water quality, <br />soil erosion, vegetation, wildlife, and the alluvial valley floor will <br />be mitigated. alining and associated activities shall not be conducted <br />in a fashion that will endanger the integrity of the private surface <br />lands in and near drainages where the overburden is not sufficient to <br />minimize subsidence, should subsidence occur. <br />29 <br />• Na~vember 1993 <br />