The mayor shall prepare general standards and cost limits for categories of capital projects and standards for the preparation of the scope of project for capital projects of various types. Such standards and limits shall be submitted by the mayor to the council for review. The proposed standards shall become effective thirty days after they have been filed with the council unless within that time the council modifies or disapproves them or part of them, after conducting a public hearing. Any modification by the council shall be subject to disapproval by the mayor in accordance with section thirty-eight and any such disapproval shall be subject to override by the council in accordance with such section.