No person shall place or cause to be placed, on any paved street, sidewalk, alley or other public place of the City, any damp cement, lime, concrete or mortar, or permit the same to become damp while on any street, sidewalk, alley or public place. No person shall mix concrete, cement, lime, mortar or similar substance on any paved street, sidewalk, alley or public place of the City, except in wooden or metallic watertight mixing beds, mortar boxes or other watertight receptacles. However, this section shall not apply to public work done under the direction of the Director of Public Works or under the direction of the City Engineer.
(1947 Code §25.36)