The purpose of this chapter is to establish a model procedure for use by state agencies, local governments and the municipal research and services center when awarding contracts under the small works roster process established in RCW 39.04.151. Use of the model procedure by state agencies is required. Use of the model procedure by local governments and the municipal research and services center is discretionary. This chapter of the Washington Administrative Code is adopted pursuant to RCW 39.04.151(4), which authorizes the director of the department of enterprise services to adopt by rule procedures implementing RCW 39.04.151. The procedures set forth in this chapter shall be included in any rules providing for a small works roster that is adopted by another state agency.