Every county work release and vocational training release program shall, however, be subject to the following conditions:
(a) Representatives of local union central bodies or similar labor union organizations shall be consulted as to the general program for such placements;
(b) That such placements shall not result in the displacement of employed workers, or be made in skills, crafts or trades in which there is a surplus of available gainful labor in the locality, or impair existing contracts for services; and
(c) That the rates of pay and other conditions of the placements shall not be less than those paid or provided for work of a similar nature in the locality in which the work is to be performed.