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- - • • iii iiiiiiiiiiiiiiii <br />.~~~, STATE OF COLOI~9v <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Dlrsctor <br />DATE: June 30, 1989 <br />T0: Tony Waldron <br />FROM: Berhan Keffelew <br />RE: Mid-Term Review of the Hayden Gulch Mine <br />File No. C-81-003 <br />As you requested I have reviewed the categories indicated on the Mid-Term <br />Review. Listed are some comments I have on the individual topics. <br />2.04.5 General Description of Hydrology and Geology <br />The general description part of both hydrology and geology is very limited. <br />However, there is a detailed account of each topic separately in 2.04.5 and <br />2.04.7. All the required maps are provided per Rule 2.10 and appear to be <br />adequate. <br />2.04.7 Surface Water Information <br />All the water quality data appear to be provided. The USGS gaging facility is <br />being used to establish the minimum, maximum and mean flows and the seasonal <br />variation for the Yampa and Williams Fork Rivers. It appears all the <br />questions raised about the water monitoring reports for the surface water in <br />accordance with 2.05.6 have been resolved. The operator has been supplying <br />the Division with semi-annual reports of the surface water quality. Also <br />stated are the seasonal variation of surface water quality and the impact the <br />mine has on the condition. The 1988 Annual Reclamation Report on hydrologic <br />monitoring on surface water had four sites. <br />1. Upper and Lower Hayden Gulch <br />2. Upper and Lower Dry Creek <br />The report was revised to include semi-annual monitoring during high flows in <br />spring and low flows in early fall. Both the lower monitoring wells still <br />show significant increases in TDS values due to increases in bicarbonate, <br />sodium and sulfates. The total quality of these surface waters is very poor <br />for all monitoring sites. <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866.3567 <br />