On August 27, 2008, a Notice of Violation was issued for a Severity Level III violation involving the failure to use a minimum of two independent physical controls that form tangible barriers to secure portable gauges from unauthorized removal, when portable gauge was not under the control and constant surveillance of the licensee. Specifically, no tangible barrier existed to secure two portable gauges from unauthorized removal when the gauges were unattended and a roll up door was open at the licensee's facility. While the gauges were stored within locked containers, the containers were not secured to prevent the containers and their contents from unauthorized removal, such that no independent physical controls that formed tangible barriers were present.