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.. -; ; mit I:umber CO-0043 age 5 of 5 Attachment 1 Special Stipulations The term "regulatory authority" means the Colorado 2lined Land Reclamation Di- vision (CL'1RD) and the Department of the Interior, OSM. 1. \ational King Coal Inc. must monitor w,ster levels and water quality in the alluvial aquifer of Hay Gulch on a quarterly basis. The e:isting monitoring well ui11 be adequate for these purposes once the following items are satisfied. A. The top of the uell must be sealed to prevent surface water and other debris from entering the well casing. B. Monitoring should only occur on Ffonday mornings, after the well has set idle for an entire weekend. National King Coal Inc. must moni- tor for the following water quality parameters: pH Conductivity Temperature Total Dissolved Solids Calcium tfagnesium Sulfate Iron Manganese C. Tile results of this water level and water quality monitoring shall be submitted to the regulatory authority on a quarterly basis. 2. National Icing Coal Inc. must prepare a mass balance plan to clarify the indicated sources of material to be used to backfill and regrade the sur- face facilities area. Such plan shall include an amended description of material sources and techniques of material placement to be utilized. Volume calculations shall be completed detailing the volume of fill re- quired and the volume of material to be obtained from each source, such as salvage of existing benches, deposition of underground development waste and roof fall, deposition of sediment from sediment ponds and the disposal of demolished surface facility debris. This mass balance e:tpla- nation shall be submitted to the regulatory authority within 60 days fol- lowing the issuance of the approved permit. Further, tational King Coal Inc. must prepare an appropriate geotechnical and stability analysis of the proposed backfilled configurations for the portal bench areas at the :Cing Coal `tine. These analyses shall utilize accepted slope stability mathematical analysis techniques, material strength determinations and appropriately detailed geotechnical knowledge of the site, in order to complete tl~e required stability demonstration. A report of this required stability analysis and the appropriate geotec?i- nical investigations or ether information acceptable to the regulatory authority dem~~nstrating stability, shall be submitted to the regulatory authority for approval within 120 days following issuance of the approved permit.