On May 18, 2021, the NRC issued a Notice of Violation to Gaston Engineering & Surveying, P.C., for a severity level III violation. The violation involved possession and use of NRC-licensed byproduct material without a license as required by Title 10 of the Code of Federal Regulations (CFR) 30.3, “Activities Requiring License.” Specifically, from January 1, 2009, through February 26, 2021, Gaston Engineering and Surveying, P.C., received, possessed, and used two portable nuclear gauges without a specific license issued in accordance with 10 CFR 30.3.