On February 24, 2014, the NRC issued a Notice of Violation to Tetra Tech, Inc. (Tetra Tech) for a Severity Level III violation. The violation involved a failure to confine possession and use of the byproduct material to the locations and purposes authorized in the license, as required by 10 CFR 30.34(c). Specifically, between June 7, 2006 and October 22, 2013, on multiple occasions, Tetra Tech personnel conducted maintenance of portable nuclear gauges that required detaching the source rod from the gauge and was not specifically licensed by the NRC or an Agreement State to perform such services.