The board shall make such rules and regulations governing the work of the department, the conduct of its employees and the performance of its duties as may be necessary to promote the interests of the state in all matters committed to its charge, and may alter or amend the same as it shall become necessary or advisable so to do.
The board shall keep a record of all its proceedings and such records, together with all maps, plans and specifications on file in its office, shall be open at all reasonable times to public inspection as public records.