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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department oI Natural Resources <br />1 J I 1 Sherman SI., Room 215 <br />Denver, CO 80207 <br />Phone: (7031 866-7 56 7 <br />FAx:(30718J2~8106 <br />November 17, 1993 <br />Mr. Karl Koehler <br />Cyprus Orchard Valley Coal Corp. <br />P. 0. Box 1299 <br />Paonia, CO 81428 <br />~~i <br />~~~ c~~ <br />~ /Q ]6 ~ <br />Roy Romer <br />Governor <br />Michael B. Long <br />Division Dveaor <br />RE: 1992 Annual Hydrology Report, Annual Subsidence Report, and Mine Inflow <br />Report Review, Permit No. C-81-038 <br />Dear Mr. Koehler: <br />The Division has completed its review of the reports identified above. Please <br />respond as appropriate within 90 days of receipt of this correspondence. <br />Annual Hydrology Report <br />General Comments <br />The Division requested that sites UERC and LERC be added to the <br />appropriate map. We are still unable to locate these stations on a map. <br />Please identify the location of these two stations by adding them to Map <br />4-l. <br />2. Site MW No. 1 is shown at two separate locations on Map 8-3. .Please <br />clarify. <br />3. Figure 16 indicates conductivities in the range of 1-6 umhos/cm. This is <br />most certainly an error. Should the scale read mmhoslcm? <br />4. Figures 3, 4, 5, 6, 7, 17, 21, 22, 24, 25, 30, and 36 show a dramatic <br />drop in recorded EC values from 1989 to 1990. What is the origin of this <br />discrepancy? <br />5. The text from the bottom of page 6 to the top of page 7 in the AHR does <br />not flow. How should it read? <br />Monitoring Frequency <br />1. Compliance with monitoring frequency was very poor in 1992. The Division <br />is currently pursuing enforcement action. <br />Water Quality <br />1. No evidence of degrading water quality is observed; however, this <br />conclusion is based on limited information. Water quality is generally <br />very good and continues to be suitable for current and intended uses. <br />