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~ , iii iiiiiiiiiiiiiii <br />Richartl D. Lamm <br />Governor <br />DATE <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches. Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />August 7, 1986 <br />T0: Sundance Coal Animas Mine - File No. C-82-055 <br />FROM: J. C. Stevens .1L ~ <br />RE: ANNUAL REVIEW OF HYDROLOGIC MONITORING DATA <br />Surface Water <br />The following material was received on a quarterly basis during the last 12 <br />months as required in the Findings of Compliance document: <br />1. Daily precipitation and temperature records; <br />2. Discharge and quality (field parameters) data for the sediment <br />ponds and permanent diversion ditch representing instances of <br />significant flow in the ditch and/or discharge from the pond; <br />3. Full suite analysis of significant ditch flows and/or pond <br />discharges; <br />4. Monthly sediment pond inspection reports; and, <br />5. Periodic spoil pile inspection reports. <br />Missing from the report is the pond inspection for July 1985. <br />The only apparent problems during the last year with surface water at this <br />site involved discharges from the pond on two occasions that temporarily <br />exceeded NPDES limits for settleable solids. The discharges followed washouts <br />of silt fences by run off from heavy rains. As a result, gabion dams are <br />reportedly being installed behind the existing silt fences to prevent such <br />future problems. <br />As noted in earlier reports, both ditch and pond waters consistently contain <br />dissolved aluminum and iron, and occasionally other trace metals, at or above <br />those levels recommended for domestic or agricultural use. These levels are, <br />however, normal for the area and not indicative of any influence by local <br />mining activity. <br />Ground Water <br />As specified in Stipulations 6 and 13 of the Findings of Compliance document, <br />semi-annual reports from ground water monitoring wells contained the following: <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />