When any building or other structure previously served by a connection to any public sewer or drain is demolished, destroyed, abandoned or altered so that any drain or portion of an abandoned plumbing system which is directly or indirectly connected to any public sewer or drain is no longer used and is not connected to the drainage system of the building or structure, the open end of such which discharged, directly or indirectly, into a public sewer or drain shall be promptly closed and sealed to the satisfaction of the Director of Public Works, so that no water or wastes not otherwise permitted to enter the public sewer or drain shall be so discharged therein. The Director of Public Works shall be notified of such abandonment or discontinuance, and of the closing and sealing of such drain, and shall be afforded an opportunity to see such work performed. All of said work shall be done by the person or party demolishing the building or structure or who alters the drainage of the premises so to make such closing and sealing necessary. In the event such person fails to perform said work, the work shall be done by the owner, lessee or tenant of the premises to the satisfaction of the Director of Public Works, all without expense to the Town.