The article discusses the mapping of 64 inactive underground storage tanks at the Hanford Site. These tanks are located in the 200-Area plateau and have been out of service for at least 12 years. The tanks are small, holding less than 190,000 liters of material, and may contain radioactive or hazardous substances. Some tanks have been stabilized or filled with grout. The goal was to update the centralized database with the current locations of these tanks, which are spread across the 200-East and 200-West Areas of the site.