What is a crucial action the Contractor must take before tack coating?

The correct action the Contractor must take before tack coating is to remove debris from the surface. Tack coating is an important step in the pavement installation process, where an adhesive material is applied to the substrate to ensure proper bonding of subsequent layers. For the tack coat to adhere effectively, the surface must be clean and free of any contaminants such as dirt, dust, leaves, or any other loose materials.

If debris is left on the surface, it can interfere with the bond between the asphalt layers, potentially leading to issues such as delamination or failure of the pavement. The importance of a clean surface cannot be overstated, as it is key to the long-term performance and durability of the road.

While the other options involve important considerations—like checking temperature, which can affect the application of the tack coat, and consulting local authorities for compliance or regulations—these actions do not directly address the immediate requirement of ensuring the surface is prepared and clean before the application of the tack coating.