No contractor, builder or other person shall encumber or obstruct any street, avenue, alley or sidewalk within the city with any building material without the consent of the Superintendent of Streets; nor, in any case, and then for a short time only, encumber or obstruct more than one-third of the driveway portion of any street, avenue or alley or one-half of any sidewalk; nor shall such obstructions continue in any case longer than may be necessary in the diligent erection of such building or the prompt execution of the work.
(‘82 Code, § 12.06.120) (Ord. 751, passed - -80) Penalty, see § 92.999