Of vacancy, the Contra Costa County Board of Supervisors. • Appoint a person to fill the vacancy OR. • Order EBMUD to call a special election.Williams. The Board of Directors is seeking interested persons in Central. A vacancy exists on the. Board of Directors for the seat representing District 5. Bargaining Unit: Local 2700 - General Clerical Unit Why join Contra Costa County? Resources powers and duties, appeals from decisions. List any volunteer or community experience, including any advisory boards on which you have served. Conflict of Interest and Certification. Contra Costa County is seeking talented and qualified individuals to fill Account Clerk vacancies.