On May 25, 2023, the NRC issued a notice of violation (Notice) and proposed imposition of civil penalty (CP) in the amount of $8,750 to G2 Consulting Group, LLC (licensee) for a Severity Level (SL) III violation for the failure to maintain control and constant surveillance of licensed material that was not in storage as required by Title 10 Code of Federal Regulations 20.1802. The violation consisted of the loss of a Troxler Model 3430 portable moisture density gauge (serial number 70894) containing 8 millicuries of cesium-137 and 40 millicuries of americium-241 that was last used at a temporary job site in Allen Park, Michigan. The Notice also included one SL-IV violation.