2011-09-09_HYDROLOGY - M1977300

• Permit No: M1977300
• IBM Index Class Name: HYDROLOGY
• Doc Date: 9/9/2011
• Doc Name: Additional Information needed- for TR12 and TR15.
• From: DRMS
• To: Cotter Corp.
• Permit Index Doc Type: Hydrology Report
• Email Name: DB2
• Media Type: D
• Archive: No

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