Wash. Admin. Code § 136-170-045
In those cases when a county desires to bundle two or more RATA funded projects into a single construction contract, the county, prior to advertising for the construction contract, or prior to commencing construction should any of the projects be scheduled for completion by county forces, must make a formal written request to the county road administration board to bundle the projects into a single construction contract. This request must describe the benefit to bundling the projects into a single construction contract and demonstrate how the county will separately track each individual project/item cost.
Upon receipt of a letter of request to bundle funded projects for construction, a letter approving or denying the request will be prepared and sent to the county from the county road administration board executive director.
Wash. Admin. Code § 136-170-045