A concrete batch plant operator oversees the machinery used in the mixing of concrete and other materials, such as aggregates and slag, typically used in construction projects. The operator’s duties include calibrating machines; setting the mixing rates, unit weights, volumes, and yields to customer or factory specifications; monitoring the mixing process; and performing quality assurance tests during and after the batching operations. Other responsibilities for a concrete batch plant operator include ensuring the order is prepared for transport in a ready-mix truck and delivered on time and documenting daily production reports