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The following information was obtained from the state of North Carolina via email: 1. Essential Details a. Narrative event description (e.g., Event circumstances and details including source radionuclide and activity). RSO (Radiation Safety Officer) discovered gauge missing while doing inventory check on Tuesday, April 11, 2017. It was last checked in the log book on March 8, 2017 when it came back from calibration and leak testing from the manufacturer. b. Report identification number. NC Local NMED 170014 c. Event date and notification date. Event discovered 4/11/2017 and notified on 4/12/2017. d. Licensee/reporting party information (i.e., name license number, and address). NC License #: 092-0104-1 Licensee: NC Department of Transportation Address: 1801 Blue Ridge Rd. Raleigh NC 27607 e. Location (site) of event. f. Whether the event is NRC reportable and the applicable reporting requirement. 10 CFR 20.2201(a)(1)(i) g. Cause and corrective actions (States and licensees' actions). Failure to properly log or check out gauge at time of use. RSO believes that it was checked out to a DOT field office and not properly recorded. They are currently contacting all trainers of gauge users, DOT engineers, and any District Engineers that may have access in order to locate gauge. They are in the process of developing a barcode scan in/out electronic use log to maintain better accountability and knowledge of gauge locations. Final causes/corrective actions are still to be determined. h. Notifications: local police, FBI, and other States; as needed. Upper State DHSR/DHHS (North Carolina Department of Health Service Regulation/Department of Health and Human Services) management notified; working on press release with public information office. i. Indicate if there are any generic implications (i.e., generic issues or concerns). None. 2. Source/Radioactive Material Isotope and activity; manufacturer, model and serial number, and leak test results, if applicable. Nuclear Gauge Make: Troxler Model: 4640-B (thin-lift asphalt) Serial Number: 1628 Type of Source: Cs-137 (8.0 mCi) Source Serial Number: 75-7134 Leak Test Results: Pass (Performed by manufacturer at last calibration).

• * * UPDATE FROM DAVID CROWLEY TO HOWIE CROUCH (VIA EMAIL) ON 4/13/17 AT 1535 EDT * * *

Gauge was discovered back at the manufacturer's facility. It apparently was checked back into the licensee, but something didn't work appropriately (not regarding RAM sources) and went immediately back to the manufacturer. Gauge was not logged appropriately for being shipped right back out and it was forgotten by the licensee sometime in the last month. Notified R1DO (Jackson) and NMSS Events Resource and ILTAB via email. THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf