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~J~~~ III 1111111111111III STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman SI., Room 215 Denver, Colorado 80203 Phone: (3031 866 7567 FAX: (3031 832-8106 November 1, 1994 Lawrence J. Corte Slurco Corporation P.O. Box 281304 Lakewood, Colorado 80228-9304 Re: 1994 Annual Hydrology Report, Canadian Strip Mine, C-81-026 Dear Mr. Corte: ~~~ DEPARTMEtUT OF NATURAL RESOURCE Roy Romer Governor lames $. Lochhead Executive Director Michael 8. Long Division Director I have reviewed the annual hydrology report (AHR) for the Canadian Strip Mine. This AHR covers water year 1994 and satisfies stipulation #32 for the submittal of water level measurements for water monitoring well #7. My review did not show any problems or deviations from the regulations or permit. Also, I am recommending deletion of Stipulation #32 from the permit. The information required in this stipulation can be submitted in the annual hydrologic report in January as was done this past year. The monitoring results are in line with Canadian's statement of probable hydrologic consequences (PHC) in the permit application. The 1994 P+I-1R contained the annual water level measurement for well No. 7 that monitors water levels in the reclaimed spoils in the Pit No.1 area. This well is the only remaining monitoring well of the I S wells that once made up the monitoring program. The monitoring program has been reduced through technical revisions. The Division is not concerned that there will be adverse groundwater quality effects caused by the backfilled spoils. The spoils water sample analysis in past AHRs shows that the water is of better quality with respect to T.D.S. than downgradient water samples. There has been an interesting rise in the water level in this well. The AHR speculates that this was caused by the backfilling of the Marr Strip Mine's 720 pit in the last year. This was expected since the Canadian Strip mine is next to the Marr strip, 720 pit. The following graph shows the annual water levels in well 7.