The state investment board may make appropriate rules and regulations for the performance of its duties. The board shall establish investment policies and procedures designed exclusively to maximize return at a prudent level of risk. However, in the case of the department of labor and industries' accident, medical aid, and reserve funds, the board shall establish investment policies and procedures designed to attempt to limit fluctuations in industrial insurance premiums and, subject to this purpose, to maximize return at a prudent level of risk. The board shall adopt rules to ensure that its members perform their functions in compliance with chapter
42.52 RCW. Rules adopted by the board shall be adopted pursuant to chapter
34.05 RCW.