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• iii iiiiiiiiniu iii <br />STATE OF COLORADO <br />Ray Romer, Governor <br />~~ <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />February 20, 1987 <br />Mr. Richard Mills <br />Senior Environmental Engineer <br />Twentymile Coal Company <br />P. O. Box 897 <br />29515 Routt county Rd. No. 27 <br />Oak Creek, Colorado 80467 <br />Re: 1986 Annual Hydrologic Report (AHR), Fish Creek Tipple, C-81-036 <br />Dear Mr. Mi11s: <br />The Division has reviewed the 1986 AHR and is very pleased with the new format <br />and content changes. The report incorporates modification requests made <br />following both the Division's review of the 1985 AHR and the Monitoring <br />Reduction revision (TR-86-O1 ). The Division noted that the Dissolved Oxygen <br />parameter was missing from the data print-outs, despite quarterly reporting of <br />this parameter. In the future, if it would not be too difficult, the Division <br />would like to have statistical analyses conducted on flows of effluent and <br />surface water sites. The new format is a great improvement from previous <br />reports. <br />The Division is very concerned with the quality of the field conductivity <br />measurements. Despite a mid-year purchase of a new meter, conductivity values <br />are still running lower than total dissolved solids concentrations, when the <br />reverse relationship should be observed (Table 1). <br />TABLE 1: Comparison of 1986 Average Total Dissolved Solids Values with <br />Electrical Conductivity Values <br />Site TDS EC TDS/EC <br />008-AU-3 756 823 0.92 <br />008-AW-3 3456 2489 1.39 <br />27A 681 683 1.00 <br />1003 699 671 1.04 <br />62 3353 2595 1.29 <br />15 990 800 1.24 <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203.2273 Tel. (303) 866-3567 <br />