On December 14, 2006, a Notice of Violation was issued for a Severity Level III violation involving the failure to use two independent physical controls that formed tangible barriers to secure a portable gauge, containing NRC licensed material, from unauthorized removal when the portable gauge was not under the control and constant surveillance of the licensee. Specifically, the licensee stored the gauge in a locked transportation case inside a locked wooden box located inside an unoccupied, unlocked building. The wooden box was not under the licensee's control, was not secured, and could be accessed by unauthorized individuals.