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Schwartzwalder Mine 2 09 September 2011 <br />Additional Information Needed File No. M -1977 -300 <br />5) Timeline of events related to Sump #10, including the date of pond backfill, the <br />date that the elevated levels of uranium were discovered, the date that Sump #10 <br />was installed, and all subsequent monitoring dates and data for Sump #10. <br />6) A technical assessment as to the probable source of the elevated uranium in the area <br />of Sump 10. <br />In addition to the previous items, Cotter must add Sump #10 to its quarterly monitoring <br />protocol. <br />You may call me with questions at 303 -866 -3567 x8108. <br />Sincerely, <br />David Bird <br />Division of Reclamation, Mining, & Safety <br />cc: John Hamrick — Cotter (via email) <br />Amory Quinn — Cotter (via email) <br />Mike Harris — WQCD (via email) <br />