By March 1st of each even-numbered year prior to a funding period, each eligible county shall, for each project for which it seeks RATA funds estimated to be available in the next project program period, submit a preliminary prospectus to the county road administration board. The format and content of the preliminary prospectus shall be prescribed by the county road administration board. Each preliminary prospectus shall be signed by the county engineer. The number of preliminary prospectuses submitted and the total amount of RATA funds requested by each eligible county should be sufficient to assure that, based upon such prospectuses, each county will be able to compete up to its county limit within its region, subject to the supplemental limitations under WAC 136-130-030 through 136-130-070.