Laserfiche WebLink
III IIIIIIIIIIIII III <br /> 999 <br /> STATE OF COLORADO <br /> MINED LAND RECLAMATION DIVISION <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 �e <br /> Denver,CO 80203 <br /> 303 866 3567 <br /> FAX 303 832-81 06 <br /> Roy Romer, <br /> Governor <br /> Fred R.Banta, <br /> Division Director <br /> DATE: May 1 , 1990 <br /> TO: Matt Hayes <br /> FROM: Cathy Begej <br /> RE: 1989 Blue Ribbon Hydrology Monitoring, File C-81-047 <br /> I have reviewed the 1989 Annual Hydrology Report for Blue Ribbon. The <br /> operator maintained the site in compliance with the Hydrologic Monitoring Plan <br /> 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 conductivities 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 8' <br /> and 28.2' deep. Monitoring was performed monthly in November and December. <br /> Future monitoring may help in identifying the hydrologic relationship between <br /> the cover and the coal waste. The 1989 Annual Hydrology Report included <br /> completion diagrams for these piezometers. <br /> Water levels in the north and south end of the central bench , Pl 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 MLRD <br /> performed during the April 25, 1990 inspection showed water levels in P1 lower <br /> than those observed in 1989, but similar to those seen in 1988 when that <br /> 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 /> Please ask Mr. Stover to modify the Hydrologic Monitoring Plan to include the <br /> two new piezometers. The current plan specifically mentions P1 -P4 so it would <br /> be appropriate to expand the description of the plan under current conditions. <br /> /ern <br /> 6695F <br />