A temporary gravel construction entrance must extend the full width of the entrance. It must be at least _____ ft long and _____ in thick.

The correct specifications for a temporary gravel construction entrance require it to be at least 50 feet long and 6 inches thick. This design serves multiple purposes: it provides a stable surface for vehicles to enter and exit the construction site, reducing the chance of sediment being tracked onto roadways. The length of 50 feet is crucial as it allows for adequate filtration of dirt and debris from vehicle tires before they leave the site, promoting effective erosion control practices. The thickness of 6 inches ensures that the gravel is sufficiently robust to withstand the traffic without being displaced, maintaining its function over time.

Thus, the requirement for both the length and thickness ensures effective sediment control, helping to comply with regulations and prevent environmental impact near the construction area.