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<br />~~~ II~'I~I~~"~~I~~ <br />STATE OF COLOI~llU <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Nanrtal Resources <br />1313 Sherman SL, Room 215 <br />Denver, Color. do 80203 <br />Phone: 1303) 866-3567 <br />FA%: (303) 83~-8106 <br />December 9, 1999 <br />Ms. Christine Johnston <br />Mountain Coal Company <br />P.O. Box 591 <br />Somerset CO 81434 <br />Dear Ms. Johnston: <br />The Division has completed review of Mountain Coal Company's Annual <br />Hydrology Report for 1998 at the West Elk Mine. Overall, it is an excellent <br />report, generating very few comments. <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFE7Y <br />BJI Owens <br />Governor <br />Greg E. Walther <br />Execwive Dueaw <br />Michael B. Long <br />Division Duecbr <br />On the positive side, the water balance diagram is a great feature. <br />Comparing the year's data to information contained in the Cumulative Hydrologic <br />Impacts Analysis (CHIA) is also a good practice. <br />Another feature that is appreciated is the map superimposing stockponds on the B- <br />seam mine map, enabling the reader to quickly see what ponds overlie areas of <br />potential subsidence. It would be even more helpful to add the higher elevation <br />seams mine maps also. <br />As to suggestions, there are several places in the surface water monitoring reports <br />where flow is reported as zero but other parameters are also reported. Apparently, <br />that means that there was water present but possibly not flowing. We suggest that <br />some designation be used (such as TR for "trace") if a small amount of standing <br />water is present that was analyzed. That would explain to the reader how an <br />analysis can be made of water in that situation. An example of this is Table C-19, <br />Box Canyon. <br />Table 8 provides flow (discharge) data in units of million gallons per day (MGD). <br />Everywhere else in the report flow units used are cubic feet per second (cfs) or <br />gallons per minute (gpm). Couldn't we dispense with at least one set of units and <br />stick to just cfs and gpm? <br />