After receiving the notice provided for in § 16-5, and within the time stated therein, the owner of all such property:shall comply with the terms and requirements of said notice; shall make said connections with the said sewerage system and do all of the things prescribed by said notice:in a thorough and workmanlike manner; in faithful conformity with all existing laws, ordinances, or regulations relating to plumbing; and especially so that no water from roofs or cellars or ground water will enter such portion of said sewerage system; shall also fill in all cesspools cleaned out pursuant to said notice with good, pure material; and in cases where the old drain is to cross a cesspool in order to reach the new sewers, shall lay an iron instead of a vitrified pipe across said cesspool. Provided, however, that upon application within said 15 days by and such owners to the Commissioner for an extension of time within which to complete said connection and other work by the section directed to be done, the said Commissioner shall grant a further time of not less than 15 days for the doing of all said work. City Code, 1927, art. 42, §§41, 43 1950, art. 33, §§17, 18 1966, art. 25, §§17, 19 1976/83, art. 25, §§16(2nd cl.), 18 Ord. 11-058 Ord. 59-164 Ord. 76-146 Ord. 84-129 Ord. 91-775