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. ,- . 1111111111111111111 �,_ <br /> STATE_ OF COLvrctiUU <br /> MINED LAND RECLAMATION DIVISION OZ8�" <br /> Department of Natural Resources1313 Snerman SI . Room 215Denver CO 80203303 866 3567 <br /> FAX. 303 832-8106 -- - -- - - <br /> Roy Rome, <br /> GDw,o, <br /> Fred R Banta <br /> Drvaioo Dnecio, <br /> May 10, 1990 <br /> Mr. James Stover <br /> MINREC, Inc. <br /> 743 Horizon Court, Suite 205 <br /> Grand Junction, CO 81506 <br /> Re: 1989 Hydrology Monitoring Report, Blue Ribbon Mine, C-81-047 <br /> Dear Mr. Stover: <br /> The Division has reviewed the 1989 Annual Hydrology Report for Blue Ribbon. <br /> The operator maintained the site in compliance with the Hydrologic Monitoring <br /> Plan found on pages 124 and 124a of the permit application. <br /> Surface water discharges in the Hubbard Creek drainage reflected the droughty <br /> conditions found throughout the state in 1989. Flows in Hubbard Creek were <br /> down and conauctivities were elevated from average. Pond 001 discharged only <br /> once in March. Neither of the other two ponds discharged. <br /> Two new piezometers were installed in October in the area regraded following <br /> the 1989 slide. These piezometers were installed adjacent to one another, and <br /> one is perforated between 2' and 12 ' while the other is perforated between <br /> 8' and 28.2' deep. Monitoring was performed monthly in November and <br /> December. Future monitoring may help in identifying the hydrologic <br /> relationship between the cover and the coal waste. The 1989 Annual Hydrology <br /> Report included completion diagrams for these piezometers. <br /> IJater levels in the north and south end of the central bench, P1 and P3 <br /> respectively, continue to show seasonal fluctuations in water levels, with <br /> substantially higher levels in the spring of each year. The monitoring Mined <br /> Lana Reclamation Division performed during the April 25, 1990 inspection <br /> showed water levels in P1 lower than those observed in 1989, but similar to <br /> those seen in 1988 when that portion of the bench slid. <br /> Field parameters are measured on the underdrains on a quarterly basis. There <br /> has been no replication of the acidic pHs seen in the southern drain in 1987. <br /> The water is saline (2600-4900 umhos/cm) and moderately alkaline. <br />