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III IIIIIIIIIIIIIIII DEPARTMENT OF NATURAL RESOURCES ggg D. Monte Pascoe. E.ecunve Dvector MINED LAND RECLAMATION DIVISIOi~J DAVID C. SH ELTON Director Fich and D. Lamm Governor MEMORANDUM June 15, 1982 To: Mike Savage From: David Craig Re: Utility and Municipal Waste Disposal at the Trapper Mine As a result of much research, I have decided to modify my stand on utility and municipal waste disposal at the Trapper Mine. The research I did to develop the "Baseline Water Quality and Overburden Geochemistry Guidelines" and a con- versation with an official at the Colorado Department of Health were the prin- cipal factors which convinced me to modify my stand. Specifically, stipulations 12 and 13 from the draft findings document may be modified to include the es- sence of the following discussion. I now believe that utility and municipal waste can be disposed of in any of the mine pits (including the Ashmore Pit) at the Trapper Mine if the proper precautions are taken. It is still imperative that the waste not come in contact with water. I feel that this standard can be achieved. To assure this, we will need a plan which more specifically addresses waste disposal at the mine. This plan will enable an inspector, both from the Division and from the mine itself, to better evaluate if the necessary precautions are being taken during day-to-day operations. The plan should contain both a narrative description and a map. The specific components of both of these are discussed below. Narrative Description The narrative description portion of the plan should specifically speak to how and where the wastes will be disposed. The following is a list of the components that the plan should contain. This list was worked out after much consultation with the other members of the staff who are involved with this issue. 1.) All utility and municipal waste shall be disposed of at least 20 feet above the projected post-mining water table. This distance should allow for a sufficient buffer zone between the waste and the ground-water ta- ble so that the error factor in the water table predictive technique can • be accounted for. Also, should the waste become wet, the leachate could pass through an attenuation zone before coming into contact with ground water. The predictive technique used to calculate the post-mining water 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567