Who should be contacted to determine the location of underground services?

Contacting the site supervisor to determine the location of underground services is crucial because the site supervisor holds the responsibility for overseeing operations on the site and ensuring that safety protocols are followed. They typically have access to relevant site plans and documentation indicating the presence of underground utilities such as gas, water, electricity, and sewage lines. By coordinating with the site supervisor, excavators can obtain accurate and specific information on the location of these services, helping to prevent accidents, service disruptions, and potential hazards to workers and the public.

The other choices do not have the same level of authority or access to vital information regarding underground services. Local government offices may have general information but may not provide immediate or specific details relevant to the exact site operation. A safety officer, while important for maintaining safety measures, may not have the technical knowledge about underground services, and an excavation employee may not possess the requisite training or have access to up-to-date site plans that detail these utilities. Therefore, the site supervisor is the most appropriate contact for this purpose.