Final answer:
In case of a sewage and wastewater backup, the area should be evacuated and maintenance must be contacted immediately for health and safety reasons. Warning signs are not adequate, and untrained individuals should not attempt cleanup.
Step-by-step explanation:
If there is a backup of sewage and wastewater on the floor, the manager should evacuate the area and contact maintenance immediately. This is a serious health hazard, and allowing operations to continue could put employees and customers at risk of exposure to harmful bacteria and other pathogens. Placing warning signs is not sufficient as the health and safety of individuals could be compromised. Cleaning the area yourself without proper equipment or training (such as mopping) could also pose health risks and is not advisable. The affected area should be blocked off until professionals can assess the situation and perform proper cleanup procedures.