The Association shall be allowed by County departments in which it represents employees use of available bulletin board space for communications having to do with official Association business, such as times and places of meetings, provided such use does not interfere with department needs. The Association may distribute materials to unit employees through County mail distribution channels if approved by the Human Resources Director. This privilege may be revoked in the event of abuse after the Director consults with Association representatives. Any Association representative shall give the Department Head or representative at least twenty-four (24) hours advance notice when contacting employees during the duty period, provided that solicitation for membership and other internal Association business shall be conducted only during the non-duty hours of all employees concerned. Prearrangement for routine contact may be made by agreement between the Association and the department head and when made shall continue until revoked.