The director is authorized to enforce the provisions of this chapter, the Grays Harbor County Comprehensive Solid Waste Management Plan (the "plan"), any intergovernmental agreements regarding solid waste disposal ("agreements"), and all other ordinances relating to the accumulation, removal and disposal of solid waste and recyclables. The director shall cooperate with and assist the health officer in all matters relating to solid waste and public health and sanitation and shall investigate all violations of this chapter, the plan, agreements, or other ordinances relating to solid waste, report the same to the proper officials, and assist in the prosecution of violators. If the city shall have an agreement with a private contractor for the collection, removal and disposal of solid waste and recyclables, the director shall be responsible to see that the provisions of such agreement are performed by the contractor.