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//++/� D NAR <br />\r V <br />COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Ginny Brannon <br />Director <br />INTEROFFICE MEMORANDUM <br />TO: Janet Binns <br />FROM: Clayton Wein <br />DATE: March 9, 2016 <br />SUBJECT: Seneca II West RN -6 / Peabody Mines AHR - DMR Data Discrepancy <br />Janet, <br />When calculating averages using data from DMRs and AHRs for Yoast, and the other Peabody <br />Mine Sites, the two averages are usually different from each other by as much as 10 percent. <br />This occures with data for flow, pH and total dissolved solids. Could you include the following <br />section in your adequacy letter for Seneca II West? <br />Using data from quarterly DMRs and AHRs to calculate yearly averages for parameters sampled at CDPS <br />discharge points, the two datasets generated different results. Averages of parameters such as flow, <br />pH, and total dissolved solids are presented in the data (or calculated by the Division), and these <br />averages sometimes differ by as much as 10 percent between a DMR and an AHR. Please explain why <br />the results from the two datasets are not equal. <br />One possible explanation, based on an initial assessment by the Division, is that some averages from <br />DMR data were calculated from minimum and maximum values rather than all values. <br />Thank you, <br />Clayton <br />CC: Rob Zuber/DRMS <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />