Forms must be straight, smooth, free from warps, and aligned with the stakes set by the director and must be of sufficient strength to retain this alignment. Depth must be not less than the total thickness of the section for which used. Forms must be securely staked, anchored, braced, and set to the established line and grade, the upper edge conforming to the grade of the finished work. Forms must be cleaned of all mortar and dirt. Surface for forms next to concrete may be required to be oiled. Forms must be of either wood or metal. (Ord. Nos. 8590; 22026)