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r,. ~~ ~~~ II~I~~I~~~~~~~~~ MINED LAND RECLAMATION DIVISION Department of Natural Resources 7373 Sherman St.. Roam 275 Denver, CO 60203 303 866-3567 Fa x: 303 632-6706 STATE OF COLORADO OF ~aCp ~~i .,. 9Y „` ~~18 ~/8 ]6 ~ Roy Romer, Governor Fred R. Banta. Divieion Director August 16, 1990 Mr. David Beverlin Resident Engineer The Pittsburg and Midway Coal Mining Company P.0. Box 176 Oak Creek, CO 80467 RE: Edna Mine, C-80-001, Annual Hydrologic Report and June 1990 NPDES Report Dear Mr. Beverlin: Enclosed is a water analysis report of samples taken on May 9, 1990. The June and July NPDES Reports indicate that water quality levels are met in this report. Only DMP's 003 and 006 discharged during this period. The report appears to be in compliance with the permit application. The Annual Hydrologic Report from 1989 was reviewed and found to be complete. The following comments result from this review. 1. The beaver dam building activity has impaired proper stream flow reading at Tr-B. Please consider a course of action to rectify this situation. Modification of the current hydrologic monitoring program will require a technical revision. This modification is expected this fall in order to reestablish full compliance with the water monitoring program in 1991. 2. Review of water quality parameters indicate little change over the previous years' results. An apparent general temperature increase is noted for the Trout Creek System. This anomaly is currently unexplained. From measurements at Tr-A, stream flows are generally lower in 1989. While this will negatively impact dilution, it is not the answer for the general temperature increases since 1981. Trout Creek, upstream from the Edna tdine, has a calcium bicarbonate type water with an average TDS of 146 mg/1 with a pH of 7.9. As the water progresses downstream past the Edna Mine, sulfates dramatically increase, becoming the predominate cation. The average sulfate level for 1989 was 382 mg/1 at a pH of 8. The average TDS at TR-D is 693 mg/1. In 1990 the Division sampled a spoils springs south of the South of Shop Slide. Its flow was about 20 gpm with 1702 mg/1 level of sulfate at a calculated TDS level of 2510 mg/1. The S.A.R. level was 0.14.