Notwithstanding any other provision of this part to the contrary, where plans and specifications have been prepared by a public agency, whose activities are subject to this part, in order for a public project to be put out for formal or informal bid, and, subsequently, the public agency elects to perform the work by day`s labor, the public agency shall perform the work in strict accordance with these same plans and specifications. Revisions of the plans and specifications may be made once a justification detailing the specific reasons for the change or changes has been approved by the public agency or its project director and a copy of the change and its justification is placed in the project file.
