Each and every wrecking and salvage yard shall be completely enclosed by a fence or wall. Such fence or wall shall be of solid construction, except that at the option of the operator of the wrecking and salvage yard, such fence or wall may be constructed so as to have a gap or gaps of not to exceed two inches (2") per lineal foot of fence or wall. Such fence or wall shall have a solid door or gate which, except during normal business hours, shall be opened only for ingress and egress. (Ord. 457, § 3, 6/11/1963)