(f) The commission shall take action upon an application for a permit, either denying or granting the permit, within 90 days after it files the application. The permit shall be automatically granted if the commission shall fail to take specific action either denying or granting the permit within the time period specified in this section. A permit shall be granted for a project if the commission finds and declares that the project is either (1) necessary to the health, safety or welfare of the public in the entire bay area, or (2) of such a nature that it will be consistent with the provisions of this title and with the provisions of the San Francisco Bay Plan then in effect. To effectuate those purposes, the commission may grant a permit subject to reasonable terms and conditions including the uses of land or structures, intensity of uses, construction methods and methods for dredging or placing of fill. Thirteen affirmative votes of members of the commission are required to grant a permit. Neither of the federal representatives who are members of the commission may vote on whether or not a permit shall be granted. Pursuant to this title, the commission may provide by regulation, adopted after public hearing, for the issuance of permits by the executive director, without compliance with the above procedure, in cases of emergency, or for minor repairs to existing installations or minor improvements made anywhere within the area of jurisdiction of the commission including, without limitation, the installation of piers and pilings and maintenance dredging of navigation channels. The commission may also adopt after public hearing such additional regulations as it deems reasonable and necessary to enable it to carry out its functions efficiently and equitably, including regulations classifying the particular water-oriented uses referred to in Section 66602 and 66605.