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cotter <br />Via Email and U.S. Mail <br />December 4. 2015 <br />Mr. Michael Cunningham <br />Division of Reclamation, Mining & Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Schwartzwalder Mine, Permit No. M-1977-300 <br />Water Quality Data and Mine Level Measurements for August and September 2015 <br />Dear Mr. Cunningham: <br />With respect to the Schwartzwalder Mine site. enclosed please find monthly water quality monitoring <br />results and daily mine water level measurements for the month of August and September 2015 <br />submitted by Cotter Corporation (N.S.L.) ("Cotter"). This submittal represents continuation of routine <br />monthly reporting of water quality monitoring results and daily mine pool levels. It includes data from <br />the new groundwater monitoring wells. There was not enough water in monitor well 16 to collect a <br />sample. <br />As discussed with you and Mr. Wally Erickson. Cotter's ICPMS experienced technical difficulties <br />during almost the entire month of September, hence the submittal of the results for August and <br />September via this letter. Because of the size of the files, rather than submitting multiple e -nails. the <br />data for both months can be retrieved at the following link: <br />Itttps://cotterusa.box.con1/s/dto2gmm phhc6tauukrps39men7bni ukr <br />Cotter also discussed the levels of uranium measured at BPL. which Cotter feels were caused by the <br />combination of poorly performing ion exchange resin and power outages. The power outages were due <br />to loss of service from United Power and site -wide electrical system damage caused by an animal <br />coming into contact with the site power distribution system. The resulting voltage surge damaged <br />electrical system components. including motors and other critical electrical equipment. Preliminary <br />data from October indicates the uranium levels at BPL have returned to pre -August and September <br />levels. <br />If you have any questions. please contact me at 719-275-7413 (ext. 202). <br />Sincerely. <br />5 <br />John S. Hamrick <br />Vice President. Mill Operations <br />Enclosures <br />cc: Daniel Arnold. Esq. (Denver Water) <br />Mike Harris (WQCD) <br />Cotter Corporation <br />Canon City Mill, P.O. Box 1750, Canon City, CO 81215-1750 USA <br />Telephone (719) 275-7413 <br />Fax (719) 275-1669 <br />