Upon completion of the work, construction or use for which the permit was issued, or when required by the director of public works, the permittee shall replace, repair or restore the right-of-way or watercourse at the place of work to the same condition existing prior thereto, unless otherwise provided in this article or in the permit. The permittee shall remove all obstructions, impediments, materials, or rubbish caused or placed within or upon the right-of-way or watercourse under the permit, and shall do any other work or perform any act necessary to restore the same to a safe and usable condition. (Ord. No. 1201, § 2 (part).)