On October 13, 2009, the NRC issued a Notice of Violation to Langan Engineering & Environmental Services, Inc. for a Severity Level III violation involving the failure to control and maintain constant surveillance of licensed material as required by 10 CFR 20.1802. Specifically, on June 29, 2009, the licensee's authorized user left unattended a portable moisture/density gauge in an unrestricted area for a short period of time. During the time that the licensee did not maintain control and constant surveillance of the gauge, it was damaged by construction equipment that was operating in the unrestricted area.