Final answer:
A minimum corrosion requirement for an underground container is to use a cathodic protection system by connecting it to a sacrificial metal. This system prevents corrosion of the container by allowing the sacrificial metal to corrode instead.
Step-by-step explanation:
A minimum corrosion requirement for an underground container is to use a cathodic protection system. This involves connecting the container to another metal that is more easily corroded, such as zinc or magnesium. The more reactive metal acts as the sacrificial anode and corrodes instead of the container, preventing corrosion of the container itself. This system is commonly used in underground steel pipelines and storage tanks.