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RECEIVED <br /> z `•o OCT 1 1 2017 <br /> Cotter DIVISION OF RECLAMATION <br /> MINING AND SAFETY <br /> Via Email and U.S. Mail <br /> October 6. 2017 <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 Pool Level Measurements for July and August 2017 <br /> Dear Mr. Cunningham: <br /> Enclosed please find monthly water quality monitoring results and daily mine water level <br /> measurements for the months of July and August 2017. Due to some sample analysis delays, we <br /> are presenting data for both July and August in this submittal. This submittal represents the <br /> continuation of routine monthly reporting of water quality monitoring results and daily mine pool <br /> elevations. A review of the July 2017 data indicates that uranium concentrations at SW-BPL <br /> averaged 24.8 µg/L with one of 6 samples exceeding 30 µg/L. For August 2017, uranium <br /> concentrations at SW-BPL averaged 16.3 µg/L with no samples exceeding 30 µg/L. <br /> Regarding arsenic,the July 2017 concentrations at SW-BPL averaged 0.75 µg/L with one of six <br /> samples above 1 µg/L. For August 2017. one of five arsenic results was 1 µg/L, while the <br /> remaining results were non-detect. <br /> If you have any questions regarding this submittal, please contact me at 719-275-7413. ext. 202, or <br /> by email at steve.cohen@cotterusa.com. <br /> Sincerely, <br /> tephen J. Cohen, PG <br /> Mill Manager <br /> Enclosures <br /> cc: Daniel Arnold, Esq. (Denver Water) <br /> Eric Mink (WQCD) <br /> Cotter Corporation Telephone(719) 275-7413 <br /> Canon City Mill, 1700 Fremont Co. Rd. 143,Canon City, CO 81212 USA Fax(719) 275-1669 <br />