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COLORADO <br />Division of Reclamation, <br />AV Mining and Safety <br />Department of Natura Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />John W. Hickeniooper <br />Governor <br />Robert W. Randall <br />Executive Director <br />GInny Brannon <br />Director <br />INTEROFFICE MEMORANDUM <br />TO: Janet Binns <br />FROM: Clayton Wein 66411 <br />DATE: January 4, 2017 <br />SUBJECT: Seneca II West RN -06 PHC Adequacy Concerns <br />Janet, <br />After reviewing the response to Item 10 in the Seneca II West RN -06 PAR, the original concerns <br />remain. The following information needs to be clarified by the Operator: <br />A) In the Probable Hydrologic Consequences section (PHC Tab 17), page 17 includes a <br />prediction of the impact of mine discharges on Dry Creek. The text states that the <br />aquifers combined will produce an estimated 4,806,953 gal/day into the mine pits, and <br />this will be discharged to Dry Creek. This very large value is used in calculations in the <br />PHC. Please identify the source of the value of 4,806,953 gallday. <br />B) Based on 4,806,953 gal/day, the calculated value of 0.02 cfs appears to be incorrect. The <br />Division has calculated 4,806,953 gal/day to equal 7.44 cfs. This should be corrected on <br />page 17 of the PHC, and the related calculations (based on this flow rate) revised <br />accordingly. <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us *1 <br />John W. Hickenlooper, Governor I Robert W. Randall, Executive Director i Virginia Brannon, Director ,�►,E'",#lw;� <br />.ter <br />