The executive director may approve scope changes except the following which require the board's approval:

(1) A change in the project limits with a request for an increase in funding beyond the executive director's administrative authority in WAC 479-01-060;

(2) Adding or decreasing through lanes;

(3) Adding or eliminating grade separations;

(4) Reducing limits greater than one hundred lineal feet;

(5) Inclusion or exclusion of major project element that may be considered a scope change by the executive director; or

(6) Changes to project components that were used to rate the project.