Upon failure of any owner(s) to construct, pave, curb, repave or recurb sidewalks, keep the same in good repair and maintain free from hazardous conditions within 10 days after written notice by the Director of the Department of Public Works or his/her designee the work may be done forthwith by the City of Reading, and the expense thereof, with costs, shall be levied and collected from such owners according to law. Nothing in this section shall preclude the Director of the Department of Public Works or his/her designee from undertaking enforcement of this Part as provided for in § 508-516.