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Richartl D. Lamm Governor DATE; DEPARTMENT OF NATURAL RESOURCES David H. Getches, Executive Director MINED LAND RECLAMATION DI\ DAVID C. SHELTO N, Director April 7, 1986 T0: Peter O'Connor FROM: Steve Renner RE: CARBON JUNCTION HYDROLOGY As per your request, I have reviewed the ground and surface water information pertinent to the Carbon Junction Mine site. Following are my comments and concerns which should be addressed during the mid-term review: mot. NPDES permit (No. C-0038610) does not appear to accurately reflect the mining operation. The operator should amend the permit accordingly. Copies of all correspondence with the Department of Health, and the revised permit should be forwarded to the Division. The operator should note that Permit No. C-0038610 expires September 30, 1986. Pond discharges are to be monitored as per NPDES permit No. C-0038610 part 1 pages 5 and 6, for the parameters tabulated in "Summary of Rationale" pages 2 and 3 (attached to NPDES Permit). The operator must submit to the Division quarterly reports of discharges and effluent concentrations. C3,~ The operator should submit to the Division the data collected during the 1985 drilling program (see attached letter). This data may be useful in assessing future mine inflows. The operator should be informed that, when mining begins in earnest, the Division may require more intensive hydrologic monitoring. This could include a more intensive well, spring and surface water monitoring program (both quantity and quality). 5. In the future, the operator should submit to the Division NPDES reports and sediment pond self inspections quarterly. Additional ground and surface water data (including spring flows), as well as the discharge data from the ponds should be submitted yearly as an Annual Hydrologic Report (AHR). The AHR will be based on a water year (October 1 through September 30). This report shall include all of the reduced and tabulated data collected during the year. An interpretation of the data and a discussion of any tends or impacts to the hydrologic system should be included in this report. The AHR shall be submitted to the Division no later than December 1st following each reporting period. Please feel free to contact me if you have further questions or comments. cc: Michael Savage /ph ~~entennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 III IIIIIIIIIIIII III 999