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iii iiiiiiiiiiiii-iii 999 MINOR REVISION HAYDEN GULCH COAL MINE REMOVAL DEMONSTRATION FOR IMPOUNDMENTS 001 (EXPLOSIVE STORAGE AREA POND) AND 002 (LANDFILL AREA POND) 1.0 INTRODUCTION H-G Coal Company (HGCC) is submitting herewith an application for a Minor Revision (MR) to Permit No. C-80-003. The purpose of this submittal is to demonstrate that H-G Mine impoundments 001 and 002 are no longer needed as sediment control structures and can be removed pursuant to Rule 4.05.2(2). Currently, impoundment 001 is the primary sediment control structure constructed for controlling storm event runoff and treating sediment from the reclaimed area which incorporated the operational Explosive Storage Area. Impoundment 002 was constructed to control storm event runoff and sediment from the reclaimed area which incorporated the operational Landfill Area. Figure 1, Sediment Ponds 001 and 002 Reclamation Demonstration, shows the location of the two ponds. Sedimentation Ponds 001 and 002 were designed as temporary treatment impoundments, and as such, removal was anticipated following the successful reclamation and revegetation of each contributing drainage area. Exhibit D found in Exhibits, Volume I of the original Hayden Gulch Mine permit application shows the Snal post-mining surface configuration. Exhibit D was developed to meet the reclamation requirements of Rule 2.05.4(c), that the reclamation plan present a backfilling and grading plan which shows the anticipated final surface configuration of the proposed permit area. A copy of the original permit page dealing with HGCC's response to Rule 2.05.4 is provided for reference. During reclamation of the mine facilities area in 1987, HGCC backfilled and regraded the previously disturbed areas which contribute runoff to ponds 001 and 002. Figure 1, Sediment Ponds 001 & 002 Reclamation Demonstration, acomputer-generated reproduction of the approved post-mining topography, shows that reclaimed topography for each previously disturbed area approximates the anticipated post-mining topography as displayed on Exhibit D. In addition, Exhibit D indicates that the only sediment impoundments proposed for retention as part of the post-mining land use were impoundments 003 and 004. A letter from the Division to HGCC, dated November 25, 1985 indicates that the Division accepted HGCC's intention of leaving impoundments 003 and 004 as permanent post-mining features. 2.0 REVEGETATION The approved post-mine land use for these areas is livestock grazing and wildlife habitat. The File cl8'TpMxl4emowl.dem N38/96 1