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~: ~__ I~~ I~II~IIIII'II'~I STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depanmem ui Nmural Kesources 1313 Sherman 51., Room 215 Denver. ColuraJu 80207 Phnne: (tf131 8hf, 3567 FA% 14U}I t432-8106 October 24, 1996 Mr. Thomas C. Anderson Oxbow Carbon & Minerals P. O. Box 535 Somerset, CO 81434 Re: 1995 Annual Hydrologic Monitoring Report; Sanborn Creek Mine; Permit No. C-81-022 Dear Mr. Anderson: II~~ DEPAIiTMEtJT OF NATURAL RESOURCES Roy Romer Governor lames 5. Lochhead E.ecwive Director Michael8 Long Division Direcor The Division has reviewed the 1995 Annual Hydrology Report (AHR) for the Sanborn Creek Mine. This letter presents the Division's comments and recommendations regarding the 1995 AHR. The operator did a good job in collecting and reporting the required water monitoring data in accordance with the approved plan. Only minor deviations from the approved water monitoring plan are noted for the frequency of data collection. It is noted that groundwater monitoring well WSC DH12 could not be sampled at the required time in June, 1995 because the well was dry. Springs SP-1 through SP-6 were not sampled in April, 1995, and springs SP-4 and SP-5 were not monitored in May, 1995. Samples could not be obtained from these springs due to poor ground conditions rendering the springs inaccessible. Colorado Discharge Permit System (CDPS) limitations were met for all discharges from the Sanborn Creek Mine. Outfall Ol l was the only discharge point that had a discharge from the mine during 1995. The Division has the following specific comments on the 1995 AHR. 1. Please provide a Table of Contents to the front of the report identifying the Appendices and Maps contained in the report. 2. It would be very helpful to have well completion information provided in the report. If available, please provide well construction details in a report table added to the AHR.