2015-08-07_PERMIT FILE - C1981028A (2)

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information gathered over the past 12 years confirms this (see Appendix J-1, J-2 of the 2nd Permit Renewal, and the Annual Hydrology and Reclamation Reports). Treatment of the sub -surface and ground water will not be necessary. Appendix M-1, Existing Surface Features Map, shows the location of any significant water diversion, collection, conveyance, storage and discharge structures (these include the perimeter ditches, the Dugout Pond and Sediment Pond 2 as permanent structures). Due to the highly permeable sand mantle that surrounds the site, these structures do not convey/hold water for any period of time. The design of the perimeter ditch is to capture and carry water from all areas within the site which have been disturbed by mining and subsequent reclamation activity to Sediment Pond 2. While it was concluded by Coors, the Division and the Department of Public Health and Environment in 1990 that a NPDES permit was not needed for this site, since there has been no discharge, events subsequent to that last permit's cancellation resulted in Coors filing to obtain a new permit (# COG -850038). This new permit falls under the Colorado general permit COG -850000 FOR FACILITIES "engaged in mining and processing of coal". As such it expires (unless renewed) with that general permit on June 30, 1997. This new permit was obtained in conjunction with the revised Drainage Plan (Technical Revision #28, approved 2/13/95) when it was concluded, based on the best information available at the time, that the changes to drainage patterns within the permit area, combined with the elimination of both the Evaporation Ponds and the active plan to control water flow through the use of the mine pits, could result in flows to the remaining sedimentation pond in excess of its design capability, and thus a potential discharge from the permit area (which would necessitate the NPDES permit). Coors intends to continue to monitor this situation and to collect date which would either justify continued renewal of the NPDES permit, or its further cancellation, based on a continued lack of any historical discharge from the permit area. At the time of the second permit renewal, Coors had submitted, and was awaiting formal approval from the Division I Water Court for a plan for water augmentation. The plan had been filed to augment calls on tributary water resulting from the consumptive use of water in conjunction with the mining operation. Subsequent decisions by Coors to cease all mining operations at the site and move to reclamation activities only resulted in the closing of sumps and the closing of the pits to levels on longer in contact with tributary waters. All remaining water use requirements at the site are being satisfied by the single remaining Laramie -Fox Hills well. The Water Court agreed to the withdrawal of the pending water augmentation plan on 7/31/91. 4. Protection of Public Parks and Historic Places These areas do not exist in or near the permit area. 126 06/15