Who ultimately determines the actual spread rate of the chip spreader?

The engineer plays a crucial role in determining the actual spread rate of the chip spreader because they are responsible for ensuring that all construction activities meet the specified design and quality standards outlined in the project plans. Engineers typically base the spread rate on various factors, including the specifications of the project, the material being used, environmental conditions, and the intended performance of the pavement.

Additionally, the engineer's expertise is essential in evaluating the project requirements and considering factors such as traffic loads, expected lifespan, and the properties of the asphalt and aggregate. Their assessments ensure that the application of materials fulfills both the engineering specifications and the performance criteria set out at the beginning of the project.

While the project manager, contractor, and supplier all have important roles in the construction process, they typically rely on the engineer's technical knowledge to guide decisions related to material application rates. The engineer holds the authority to recommend or approve modifications to these rates based on their professional judgment and the requirements of the project.