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Permit [dumber CO-0043 Page 5 of 5 Attachment 1 Special Stipulations The term "regulatory authority" means the Colocado ;tined Land Reclamation Di- vision (CL:1RD) and the Department of the Interior, OSP[. 1. National King Coal Inc. must monitor water levels and water quality in the alluvial aquifer of Hay Gulch on a quarterly basis. The existing monitoring well will be adequate for these purposes once the following Items are satisfied. A. The too of the well must be sealed to prevent surface water and other debris from entering th=_ well casing. B. Ponitoring should only occur on Monday morni~g~s, after the well has set idle for an entire weekend. National King Coal Inc. must moni- tor for the fo1lo~.aing water quality parameters: pH Pfagnesium Conductivity Sulfate Temperature Iron Total Dissolved Solids Manganese Calcium C. The results of this water level and water quality monitoring shall be submitted to the regulatory authority on a quarterly basis. 2. National King Coal Inc. must prepare a mass balance plan to clarify the indicated sources of material to be used to backfill and cegrade 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 expla- nation shall be submitted to the regulatory authority within 60 days fol- lowing the issuance of the approved permit. Further, National King Coal Inc. must prepare an appropriate geotechnical and stability analysis of the proposed backfilled configurations for the portal bench areas at the King Coal Mine. 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 the required stability demonstration. A report of this required stability analysis and the appropriate geotech- nical investigations or other information acceptable to the regulatory authority demonstrating stability, shall be submitted to the regulatory authority Eor approval within 120 days following Sssuance of the approved Permit.