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III IIIIIIIIIIIIIIII\`' <br />~~~°~ STATE OF COLOI~U <br />Roy, J3omer, Governor <br />LJ <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SH ELTON, Director <br />May 12, 1987 <br />Mr. Rich Atkinson <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Re: 1986 Annual Report - Colowyo Coal Mine - File No. C-81-019 <br />Dear Mr. Atkinson: <br />The Division has reviewed the Colowyo 1986 Annual Report. In general, the <br />data indicates that the mine continues to operate in compliance with the <br />requirements of the regulations and approved permit. The following specific <br />comments are a result of this review. <br />Format <br />Although the data contained in the report is well presented, the Division has <br />several minor proposals to refine the reporting format. <br />1) The printout format for cumulative ~ydrp_logic data has created a <br />document which is becoming increasingly bulky. The Division <br />requests that Colowyo consolidate this information. One possible <br />format is displayed on the attached page. Printout of the data on <br />8-1 /2 by ]1 paper may also help reduce the bulk of the request. <br />2) The Division requests that Colowyo sort (arrange) the cumulative <br />data by year rather than by month. This would greatly enhance the <br />depiction of long-term trends, and facilitate review by the <br />Division. In addition, if graphs of the same parameter could be <br />drawn at the same scale for ali sites, these graphs could be <br />overlayed so that trends between sites could be analyzed. <br />Hydrology <br />The narrative descriptions contained in the report are generally thorough and <br />accurate. The following comments note only those trends not described by the <br />operator. Colowyo should respond to these comments as necessary. <br />1) A decrease in calcium was noted on the 1986 Upper Goodspring Creek <br />graph. The tabular data does not support the decrease, which <br />therefore may be a plotting error. Colowyo should explain this <br />apparent discrepancy. <br />2) No tabular data is given for 1986 magnesium levels for Taylor <br />Creek. This data should be supplied if available. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />