1992-09-25_GENERAL DOCUMENTS - C1981017

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STATE OF COLORADO MINED LAND RECLAMATION DIVISION Department of Natural Resources Few' 1313 Sherman St.,Room 215 Denver,CO 80203 303 866-3567 *1876 FAX 303 832-8106 _. Roy Romer, Governor R.Banta, April 24, 1991 DredonDirect Division Director Ms. Diane Delaney Mid-Continent Resources , Inc. 201 Centennial Street, Suite 406 Drawer 122 Glenwood Springs , Colorado 81601 RE: Water Sample Results File: C-81-017 Dear Ms. Delaney: Enclosed are total suspended solids (TSS) and settleable solids analyses for water samples I obtained at the Coal Basin Mine on April 3, 1991 , Sample #911525 was taken from the mine water discharge stream above the 016 pond series; #911526 was taken at the NPDES discharge point at the outfall from the lower-most pond in the 016 series; #911527 was taken from the NPDES discharge point at the outfall from the lower-most pond in the 001 series. Snow melt runoff was occurring at the time of the inspection and melt water was entering both the 016 and 001 pond series at the time the samples were taken . Given these facts , settleable solids is the applicable standard under the NPDES permit, and both pond discharge samples indicate compliance with the standard (less than .5 ml s/1 ) based on both the DOH analysis and Imhoff Cone tests I ran on April 4. While TSS is not the applicable standard in this instance, the relatively high TSS levels in both pond discharge samples is of concern and the Division will continue to monitor the ponds on a regular basis . Treatment of the ponds with approved settling agents would appear to be warranted to insure future compl iance wi th TSS 1 imi tations . Please contact me if you have any questions or comments. Sincere y, Dan T. Ma th ws Reclamation Specialist DTM/yjb Enclosure(s) cc: Coal Basin Group Steve Renner 5122F