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<br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />13135hermin SL, Knom ?IS <br />Denver CO RU?03 <br />Phone: (3031 866-3 56 7 <br />FAS: ~ SUi1 8:i _'-B1Ub <br />March 19, 1993 <br />Mr. Karl Koehler <br />Cyprus Orchard Valley Coal Corp. <br />P.O. Box 1299 <br />Paonia, CO 81428 <br />Re: 1991 Annual Hydrology Report, Annual Subsidence Report, <br />and Mine Inflow Report Review, Permit No. C-81-038 <br />Dear Mr. Koehler: <br />of Cora <br />N~~b <br />o, <br />. a~ . <br />~ X8]6 <br />Rov Romer <br />Governor <br />nhchael B. LOnR <br />Drvrsian Direuor <br />The Division has completed its review of the reports identified above. Please respond as <br />appropriate within 90 days of receipt of this correspondence. <br />Annual Hvdroloav Report <br />General Comments <br />1 , Overall, the report format is very good. The use of tabs to separate the report <br />into its various sections greatly facilitates the review process. <br />2, Referencing permit maps for monitoring station locations and hydrologic features <br />is acceptable. However, many times the only copies available are the public or <br />specialist permit volume copies. It assists the Division if a copy of each map is <br />included so they can be used for the review process. This way, we are assured <br />of a clean copy for the specialist and public permit volumes. <br />3. The Division agrees in principle to a monitoring reduction. However, we have <br />some reservations about the specifics as outlined in the section Future <br />Hydrologic Monitoring. Also, as you are aware, any monitoring reduction is <br />required to be handled as a technical revision. The Division suggests meeting <br />prior to submitting this revision to discuss the specific details concerning changes <br />to your monitoring program. This should assist in streamlining the process and <br />cutting down on adequacy iterations. <br />Errors and Omissions <br />iiiiiiiiiiuiiuiii <br />STATE OF COL~~.~~v <br />1 . The elevation on Pond 87 is incorrect in both Table 1 and on Map 4-1 . It should <br />be 7990. <br />