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iii iiiiiiiiiiii-iii <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment vi Natural Resources <br />1 } 1 } Sherman 51 , Rnom 215 <br />Uenver. C:?.:O?Ul <br />Phone: 6UJi 8h6J5n7 <br />F.4x: 140]1 BJ 2~i5106 <br />April 8. 1993 <br />Mr. Robert Peterson <br />ACZ, Inc. <br />P. 0. Box 774018 <br />Steamboat Springs, CO 80477 <br />Re: 1992 Annual Hydrology Report, <br />Grassy Gap Mine, No. C-81-039, <br />Rockcastle Coal Company. <br />Dear Mr. Peterson: <br />of ~O~o <br />~~ \~~ . <br />~NC ;~ O <br />~ O <br />~•,' <br />~ r8 T6 <br />Rov Romer <br />Governor <br />~~+~chael B Long <br />Division Dvec mr <br />The Division has completed review of the above mentioned report. Overall the <br />reper*. is well organized and the information is clearly presented. 0~!*' <br />comments are as fellows: <br />Surface monitoring site SW-3 shows e <br />Magnesium values above what would be <br />These values are similar to what one <br />Pit No. 1 is the only possible spoil <br />springs were identified for Pit. No. <br />with regard to this phenomenon. <br />levated sulfate, TDS, Calcium and <br />expected for this upstream site. <br />would expect of a spoil spring. <br />spring contributor yet no spoil <br />i. Please provide your comments <br />Thank you for your continued efforts to comply with the approved monitoring <br />schedule for the Grassy Gap Mine. <br />Sincerely, <br />.~ ; <br />/r <br />Ke/nt A. Gorham <br />Rp~ciamation Specialist <br />KAG/amm <br />7047E <br />STATE OF COLORADO <br /> <br />