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r- .r <br />sir riiriirri~ri~~-iii <br />999 <br />STATE OF COLORADO <br />Roy Romer, Governor <br />r~ i~ <br />DEPARTMENT OFNATURALRESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Dlreetor <br />August 8, 1988 <br />Mr. Wiliam Balaz <br />Manager-Regulatory Compliance <br />Kaiser Coal Corporation <br />102 South Tejon, Suite 400 <br />P.O. Box 2679 <br />Colorado Springs, CO 80901-2679 <br />Re: 1987 Annual Iydrologic Report, Somerset IAine, C-80-002 <br />Dear Mr. Balaz: <br />I have reviewed the 1987 Annual Hydrology Report (AHR) for the Somerset Mine. <br />I found the report well organized and I appreciated the statistical analysis <br />of data from each site. The figures were useful and the cross-sections and <br />flooded workings map were most illuminating. <br />It was difficult to ascertain the parameters for which you should be <br />monitoring from the files and permit application. Section 2.05.6(3)(b)(iii) <br />of the permit application suggests that the parameters monitored would be <br />consistent with baseline data found in section 2.D4.7. Minor Revision 2, <br />submitted July 15, 1987, suggests that parameters listed in the Colorado <br />Guidelines for Water Quality Parameters (9/16/82) would be monitored. Please <br />clarify this situation. We would appreciate it if SAR and mass balan,Ge <br />eval.uaki•ons_were included with the data. You should be able to obtain this <br />free-of-charge from your laboratory. <br />Several other questions came up during this evaluation for which we would <br />appreciate responses within thirty days. These relate to both the AHR and the <br />Renewal. <br />1) Please submit or reference the location of completion diagrams for B-6 <br />and H-10. <br />2) Revise the Probable Hydrologic Consequences section (PHC) to include <br />predictions on the rate of flooding of the workings, based on data <br />collected to date. <br />3) It appears that the utilization of data from two holes within the flooded <br />workings over a five mile extent is a considerable extrapolation. Please <br />suggest a way to improve the responsiveness of the data collection system <br />to the objectives of this study, or defend the current program. <br />4) The collection of "sedimentation ponds" at the Elk Creek Yards is <br />unwieldy to inspect and maintain. Despite the infrequency of discharge <br />events at the site, the staff is uncomfortable with the current system, <br />215 Centennial Building, 1313 Sherman Street Denver, Coloratlo 80203-2273 Tel. (303) 866-3567 <br />