Which group is responsible for the placement of temporary markers on pipeline sites?

The role of marking personnel is specifically to place temporary markers on pipeline sites. These markers are crucial for indicating the presence of buried pipelines and helping to prevent accidental damage during excavation or construction activities. Marking personnel are trained to understand the standards and protocols for marking, ensuring that the markers are placed accurately and in compliance with safety regulations.

While excavators may interact with the site and have a responsibility for their safety practices, they are not typically tasked with the placement of markers. Pipeline operators oversee the overall operation and maintenance of the pipelines but do not usually engage directly in marking activities on the ground. Surveyors generally focus on measuring and mapping land and may play a role in the planning of pipeline routes but are also not the ones responsible for placing temporary markers at the site. Thus, the specificity of the marking personnel's duties makes them the correct choice for this question.