(a) Official Permission Required. It shall be a misdemeanor for any person to go upon any premises operated by the Board of Public Works of this city as a street maintenance yard, sewer maintenance yard, incinerator plant, dump, sewage treatment plant, sewage pumping plant, refuse collection transfer yard, equipment yard or storage yard, without the express permission of the Board of Public Works, or its duly authorized representative. No person shall be deemed to have such permission unless he has evidence thereof upon his person or unless he has the express oral consent of the officer or employee present at, and in immediate charge or care of, the premises.
The foregoing restriction shall not apply to any premises not posted as hereinafter provided, nor shall it apply to law enforcement officers, or to officers or employees of this City or of any governmental agency acting in the course of their public duties.
(b) Signs to be Posted. The Board of Public Works shall cause appropriate signs to be posted, at intervals of not more than 200 feet, about the boundary of any such premises, giving notice of the effect of this section.
(c) Enforcement. Any policeman or any authorized employee of the Department of Public Works, may use reasonable force to remove or expel from such premises any person who violates this section and who upon being directed to leave refuses to do so. This is in addition to other remedies provided by law.
(d) Access for Lawful Purposes. Subject to fair and reasonable conditions, necessary access to any posted premises shall be granted by the Board upon written request to any person having lawful business there to perform; and to anyone who has, and asserts in good faith, the right to inspect any such place for purposes incident to any proposed or pending action at law or in equity; and to other persons at the reasonable discretion of the Board, to be exercised in the public interest.
(e) Premises Not Requiring Protection. Whenever the Board shall find, as to any particular premises mentioned in this section, that there is no appreciable hazard of loss or damage to public property at such place, or other public purpose to be subserved by posting the same, it need not be posted, and, if not posted, the prohibitory provisions of this section shall not there apply.