§ 2. Obstructing streets.

The district shall exercise its privileges herein subject at all times to the police power of the city and shall not unnecessarily or unreasonably obstruct the use of or injure any street, avenue, alley, or other public place in any way, and shall, upon the completion of any construction or repair, restore all streets, avenues, alleys, or other public places or ways of the municipality which shall be opened by it or its agents or employees for the purpose of laying, placing or repairing its aforesaid gas mains or service pipes to as nearly the same order and condition as they were before the excavation was made as is reasonably possible and to preserve them in this condition for 12 months. Any obstruction of any street, alley, park, boulevard, bridge, or other public place or way, or any failure properly to fill and maintain a street after excavation, after proper notice of ten days demanding removal or repair, as the case may be, shall be taken care of by the city and the cost thereof, plus ten percent for administering and engineering expense, shall be charged against the district.