Spoils must be kept ___ feet from the side of the trench?

The correct distance that spoils must be kept from the side of a trench is 2 feet. This requirement is in place to ensure that the stability of the trench walls is not compromised. Keeping spoil piles too close to the edge can lead to potential collapses or slides, creating a hazardous environment for workers inside the trench. The regulation aims to maintain a safe working area and minimize risks associated with shifting materials.

Other distances listed may not provide the necessary safety margin, which is why they are not the correct answers in this context. By adhering to the 2-foot guideline, workers can help ensure that there is ample space between the spoil and the trench wall, which is critical for maintaining the integrity of the excavation site and ensuring worker safety.