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• • Ill lllllllllllll 111 <br />999 <br />STRTE OF COLOTZADO <br />Roy Romer, Gove <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Dlrsetor <br />July 8, 1988 <br />Mr: Richard Hughes - <br />Colorado Yampa Coal Company <br />24587 Routt County Road No. 27 <br />Oak Creek, Colorado 80467 <br />RE: First and Second Quarter 1987-1986 Water Year Hydrology Reports <br />Mine No.l, Mine No.2, Eckman Park-C-81-071, and Mine No. 3, C-B4-D62 <br />Dear Mr: Hughes: <br />We have reviewed the above-referenced reports and some possible problems have <br />been indentified. Please review this letter and provide a response at your <br />earliest convenience so that these possible problems can be corrected prior to <br />the end of the current water year: Note that we will not attempt to analyze <br />the data until the next Annual Hydrology Report is submitted. <br />General Questions (C-81-071 and C-84-062) <br />1. As discussed in our review of the Annual Hydrology Report for last <br />year, the detection limit for mercury is consistently higher than <br />the :00005 mg: /1, stream standard. Please attempt to achieve a <br />lower detection limit or provide an explanation if a lower limit is <br />not possible: <br />2. Several of the discharge measurements are expressed only as a stage <br />elevation in the computer printout. Please update the data base to <br />include the elevation to discharge conversion. <br />3. It is noted that in some cases discharge is not given because flow <br />was at some level below the capability of the developed rating <br />curve for the site. An alternate method for measuring discharge <br />should be used to estimate flow for these situations. Please <br />discuss a plan to remedy this problem. <br />4. Please be sure to collect the additional ground water samples as <br />discussed in the 1986-1987 Annual Hydrology Report review. <br />5. Carbonate is apparently not measured for any of the samples. We <br />understand that carbonate values should be very low in the local <br />water; however, it must be checked. <br />Please verify that carbonate will be analyzed or provide <br />documentation in the printouts that the levels are insignificant. <br />