In which scenario is it true that the layout should be clearly visible after digging begins?

When layout lines are extended past limits, it ensures that the layout remains visible and clear even after the digging has commenced. This extension allows operators and workers to maintain a reference point throughout the excavation process, preventing confusion about the intended lines and facilitating accurate digging according to the design specifications. Extending the lines provides a buffer that helps prevent them from being obscured or erased by the digging equipment or the movement of soil, thereby increasing the overall precision and safety of the project.

In scenarios where layout lines are not extended or are drawn on loose soil, visibility may be compromised, making it more challenging to follow the intended plan during the digging phase. Poorly marked lines can also lead to inaccuracies and mistakes, which could result in delays and increased costs.