On April 10, 2008, a Notice of Violation was issued to the City of Mt. Pleasant MI an NRC licensee. This action was based on a Severity Level III violation of 10 CFR 30.34(i) involving the licensee's failure to maintain a minimum of two independent physical controls that formed tangible barriers to secure a portable gauge from unauthorized removal during a period when the portable gauge was not under the control and constant surveillance of the licensee. Specifically, the licensee secured a transport case, containing a gauge, in a storage room using only a single lock, and also secured a transport case, containing a gauge, while in temporary storage in an open-bed pickup truck using only one lock and chain.