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'~'" -,L I~~'~II~~~II"I' I~I DIVISION OF MINERALS AND GEOLOGY Depanmenl of Natural Resources STATE OF COLORADO _ 1313 Sherman Sl., Room 215 t Denver, Colorado 80203 Phone: 13031866-3567 FAX: 1303)832-8106 May 28, 1998 ~~~ DEPARTMENT OF NATURAL RESOURCES Mr. Jim Stover lvIINREC> INC. Roy Romer Governor lames 5. Lochhead 2768 Compass Drive, Suite 101 E><eculive Director Grand Junction Colorado 81506 r Michael B. long Division Director RE: 1997 Annual Hydrology Report, Red Canyon Mine Permit No. C-81-034 Deaz Mr. Stover: The Division has completed review of the referenced annual hydrology report (AHR). We have also considered the questions posed by Larry Reschke concerning timing and method of sealing the remaining monitoring wells. With regard to sealing methodology; sealing of alluvial wells by cuttings only, without using cement or other sealant would be acceptable, as long as there is no potential for cross contamination from a bedrock well. Pelletized sealant is suitable for use in coal seam or bedrock wells, as long as any segments of such wells which penetrate the glacial- alluvial aquifer are cemented. A minor revision to the permit would be necessary to address such modifications. As I previously indicated to Mr. Reschke, permanent monument markers extending above ground level will not be required, as such markers would be likely to interfere with agricultural and residential land uses in the azea. Reclaimed wells should be temporarily flagged or staked to facilitate bond release inspection. Based on review of the AHR, and consideration of PHC related findings we will be required to make with respect to final bond release, we have the following questions and requests. The statement in the AHR indicating that the rising water level in Well E-1 is not likely indicative of rising water levels in the mine should be explained, and documentation may be required. Well E-1 should not be sealed until after final bond release approval. The well should be sampled a[ least one additional time prior to submittal of the final bond release application, with water level and full groundwater analysis report provided to the Division. 2. Alluvia] Wells A-1 and A-2, and Refuse Well R-6, should likewise be sampled at least one additional time, with water levels and full chemical analyses submitted to the Division prior to bond release application. Wells other than E-1, A-1, A-2, and R-6, can be plugged and reclaimed, with no further data collection needed. The four wells for which further sampling is requested should remain open until after the bond release