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• Sediment Pond 2 as permanent structures). Due to the highly permeable <br />sand mantle that surrounds the site, these structures do not convey/hold <br />water for any period of time. The design of the perimeter ditch is to <br />capture and carry water from all areas within the site which have been <br />disturbed by mining and subsequent reclamation activity to Sediment <br />Pond 2. <br />While it was concluded by Coors, the Division and the Department of <br />Public Health and Environment in 1990 that a NPDES permit was not <br />needed for this site, since there has been no discharge, events subsequent <br />to that last permit's cancellation resulted in Coors filing to obtain a new <br />permit (# COG - 850038). This new permit falls under the Colorado <br />general permit COG - 850000 FOR FACILITIES "engaged in mining and <br />processing of coal ". As such it expires (unless renewed) with that general <br />permit on June 30, 1997. <br />This new permit was obtained in conjunction with the revised Drainage <br />Plan (Technical Revision #28, approved 2/13/95) when it was concluded, <br />based on the best information available at the time, that the changes to <br />drainage patterns within the permit area, combined with the elimination of <br />both the Evaporation Ponds and the active plan to control water flow <br />through the use of the mine pits, could result in flows to the remaining <br />sedimentation pond in excess of its design capability, and thus a potential <br />discharge from the permit area (which would necessitate the NPDES <br />permit). Coors intends to continue to monitor this situation and to collect <br />date which would either justify continued renewal of the NPDES permit, <br />or its further cancellation, based on a continued lack of any historical <br />discharge from the permit area. <br />At the time of the second permit renewal, Coors had submitted, and was <br />awaiting formal approval from the Division I Water Court for a plan for <br />water augmentation. The plan had been filed to augment calls on tributary <br />water resulting from the consumptive use of water in conjunction with the <br />mining operation. Subsequent decisions by Coors to cease all mining <br />operations at the site and move to reclamation activities only resulted in <br />the closing of sumps and the closing of the pits to levels on longer in <br />contact with tributary waters. All remaining water use requirements at the <br />site are being satisfied by the single remaining Laramie -Fox Hills well. <br />The Water Court agreed to the withdrawal of the pending water <br />augmentation plan on 7/31/91. <br />4. Protection of Public Parks and Historic Places <br />These areas do not exist in or near the permit area. <br />U <br />126 11 /10 <br />