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Criterion 2 8 • Federal lands with National Resource Waters, as identified by states in their water quality management plans, and a buffer zone of federal lands '/.-mile from the outer edge of the far banks of the water, shall be unsuitable. Analvsis None of the lands in the proposed lease tract are identified as a National Resource Water. Criterion 19 Federal lands identified by the surface management agency, in consultation with the state in which they are located, as alluvial valley floors according to the definition in Subpart 3400.0- 51a1 of this title, the standards of 30 CFR Part 822, the final alluvial floor guidelines of the Office of Surface Mining Reclamation and Enforcement when published, and approved state programs under the Surface Mining Control and Reclamation Act of 1977, where mining would interrupt, discontinue, or preclude farming, shall be considered unsuitable. Additionally, when mining federal land outside an alluvial valley floor would materially damage the quantity or quality of water in surface or underground water systems that would supply alluvial valley floors, the land shall be considered unsuitable. Analvsis A potential Alluvial Valley Floor IAVF) on the proposed lease tract is the Quaternary Alluvium associated with the North Fork of the Gunrnson River. This area has already been found to be unsuitable for coal extraction under Criteria Number 16 - "Federal Lands in Special Floodplains". However, a concern remains that coal extraction on other parts of the proposed lease could • materially damage the quantity and/or quality of water that supplies this AVF, due ttl the potential hydraulic connection between the AVF and Mesaverde Formation. Due to insufficient aata, a determination can not be made until a mine plan for the area has been submitted. At :hat time, the Regulatory Official will make a finding concerning possible material damage to the alluvial valley floor. As a result of the finding, some restrictions to the mining operations may be necessary. Cnt=rion 2C Federal lands in a state to which is applicable a criterion (il proposed by the state or Indian tribe located in the planning area, and Iii) adoptetl by rulemaking by the Secretary, shall be considered unsuitable. Analvsis This criterion is not presently ~n effect in the State of Colorado. SUMMARY The Box Canyon Tract was determined to be suitable for coal mining following the application of :Jnsuitabiiiry Criteria Numbers 4, ~, ii, 7, 8, 10. 73. ~ 7. 18, and 20. after the aooiicanon of Cntenon Number t o, :ne ' 00-veer 9oodplain of the North Fork of the ~~unnison Giver (approximaterv 76 acresl ~s unsuitable for coal mining. ~: r.-^ion :~Jumoers i . =. '. 3, 1 1 . 1 _. '. 4. 1 5 and "~ ° ~.vere ;Duna ;o t;e unsuitable for mining, • .~owever. arter applvmg ;ne excepnons :o ne r.cenon.:nev were suitable for mining with the sallowing res[nctions: aopendix.~, Paae 10