Additionally, we are frequently looking to fill a variety of different positions within our Department. Contra Costa County Probation Department Volunteer Application Form.(Please Print or Type). __ 2-month probationary. __ 5-month probationary(fill out attached form) FINAL. Each Employee in a Confidential classification shall have probationary status during the first six months in the classification. The Contra Costa County Probation Department is seeking qualified individuals to fill vacancies for the position of Juvenile Institution Officer I. DECLARE a vacancy in the AtLarge 6 Seat on the Contra Costa. Commission for Women and Girls for a term ending February 28,.