What does the One Call System notify regarding proposed excavations?

The One Call System primarily serves to notify utility companies about proposed excavations in a designated area. This system is essential for ensuring safety during excavation activities, as it helps prevent accidental damage to underground utilities, such as gas, water, electricity, and telecommunications lines. When an excavation is planned, the One Call System allows the operator to inform relevant utility companies that can then mark the locations of their lines. This not only protects the equipment and the workers but also mitigates the risk of service interruptions for customers.

The other choices do not accurately represent the function of the One Call System. While state authorities and local residents may need to be informed about certain excavations for regulatory or community purposes, the primary role of the system is to enhance communication between excavators and utility providers to ensure safe excavation practices.