That part of building sewers, as defined in TMC § 925.02, which are located within the public right-of-way, are owned by the City and repaired and replaced by the Division of Sewers and Drainage. If damaged during construction, any expense incurred by the Division in maintaining such service shall be assessed against the Person causing the damage. Cleaning and clearing of blockages of building sewers is the property Owner's responsibility from the Premise to the main sewer.