The department shall establish a scientific advisory board to review plans to establish or expand the geographic area where an inspection and maintenance system for motor vehicle emissions is required. The board shall consist of three to five members. All members shall have at least a master's degree in physics, chemistry, or engineering, or a closely related field. No member may be a current employee of a local air pollution control authority, the department, the United States environmental protection agency, or a company that may benefit from a review by the board.

The board shall review an inspection and maintenance plan at the request of a local air pollution control authority, the department, or by a petition of at least fifty people living within the proposed boundaries of a vehicle emission inspection and maintenance system. The entity or entities requesting a scientific review may include specific issues for the board to consider in its review. The board shall limit its review to matters of science and shall not provide advice on penalties or issues that are strictly legal in nature.

The board shall provide a complete written review to the department. If the board members are not in agreement as to the scientific merit of any issue under review, the board may include a dissenting opinion in its report to the department. The department shall immediately make copies available to the local air pollution control authority and to the public.

The department shall conduct a public hearing, within the area affected by the proposed rule, if any significant aspect of the rule is in conflict with a majority opinion of the board. The department shall include in its responsiveness summary the rationale for including a rule that is not consistent with the review of the board, including a response to the issues raised at the public hearing.

Members shall be reimbursed for travel expenses as provided in RCW 43.03.050 and 43.03.060.