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While it was concluded by Coors, the Division and the Department of Public Health <br />and Environment in 1990 that an NPDES permit was not needed for this site, since <br />there has been no discharge; events subsequent to that last permit's cancellation <br />resulted in Coors filing to obtain a new permit (# COG-850038). This new permit <br />falls under the Colorado general permit COG-850000 for facilities "engaged in mining <br />and processing of coal". As such it expires (unless renewed) with that general permit <br />on June 30, 1997. <br />This new permit was obtained in conjunction with the revised Drainage Plan <br />(Technical Revision #28, approved 2f 13195) when it was concluded, based on the <br />best information available at the time, that the changes to drainage patterns within the <br />permit area, combined with the elimination of both the Evaporation Ponds and the <br />active plan to control water flow through the use of the mine pits, could result in <br />flows to the remaining sedimentation pond in excess of its design capability, and thus <br />a potential dischazge from the permit area (which would necessitate the NPDES <br />permit). Coors intends to continue to monitor this situation and to collect data <br />which would either justify continued renewal of the NPDES permit, or its further <br />cancellation, based on a continued lack of any historical dischazge from the permit <br />area. <br />At the time of the second permit renewal Coors had submitted, and was awaiting <br />formal approval from the Division I Water Court for a plan for water augmentation. <br />• This plan had been filed to augment calls on tributary water resulting from the <br />consumptive use of water in conjunction with the mining operation. Subsequent <br />decisions by Coors to cease all mining operations at the site and move to reclamation <br />activities only resulted in the closing of sumps and the closing in of the pits to levels <br />no longer in contact with tributary waters. All remaining water use requirements at <br />the site are being satisfied by the single remaining Laramie-Fox Hills well. The Water <br />Court agreed to the withdrawal of the pending water 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 /> <br />126 <br />