§ 22-81. Building sewer specifications.

(a)

The building sewer shall be cast iron soil pipe, ASTM specifications (A74-69) or equal; vitrified clay sewer pipe, ASTM specifications (613-69) or equal, ABS pipe, ASTM D-2751; PVC ASTM 3034 or other suitable material approved by the sewer superintendent. Joints shall be tight and waterproof. Any part of the building sewer that is located within six (6) feet of a water service pipe shall be constructed of cast iron soil pipe with leaded joints. Cast iron pipe with leaded joints may be required by the superintendent where the building sewer is exposed to damage by tree roots. If installed in filled or unstable ground, the building sewer shall be of cast iron soil pipe, except that nonmetallic material may be accepted if laid on a suitable concrete bed or cradle as approved by the superintendent.

(b)

The size and slope of the building sewer shall be subject to the approval of the sewer superintendent. In general, the building sewer shall be the same size as the service branch but in no event less than four (4) inches in diameter. The slope of the building sewer shall in no event be less than one-eighth inch per foot for four-inch pipe.

(c)

Whenever possible the building sewer shall be brought to the building at an elevation below the basement floor. No building sewer shall be laid parallel to and within three (3) feet of any bearing wall which might thereby be weakened. The depth shall be sufficient to afford protection from frost. The building sewer shall be laid at uniform grade and in straight alignment insofar as possible. Changes in direction shall be made only with properly curved pipe and fittings.

(d)

In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lifted by approved artificial means and discharged to the building sewer.

(e)

All excavations required for the installation of a building sewer shall be open trench work unless otherwise approved by the sewer superintendent. Pipe laying and backfill shall be performed in accordance with ASTM specifications (C-12) latest revision, except that no backfill shall be placed until the work has been inspected.

(f)

All joints and connections shall be made gastight and watertight. Bituminous and concrete joints should be prohibited between sections at pipe of similar materials. Cast iron pipe joints shall be the compression joint. All compression joints shall be made with a one-piece rubber gasket meeting the requirements of A.S.T.M. Specification C 564. The spigot end of the pipe shall be plain and shall be pushed into the gasketed hub. All joints in vitrified clay pipe shall be made with a resilient joint meeting A.S.T.M.C 425 Specifications. All such joints shall be premolded and factory attached.

(g)

The building sewer shall be connected into the public sewer at the property line, if a service branch is available at a suitable location. Where no properly located service branch is available a neat hole may be cut into the public sewer and a suitable wye or tee saddle installed to receive the building sewer. Direct subins through the wall of the sewer pipe shall not be permitted. Whenever possible the connection shall be made at the top of the pipe and smooth bends not exceeding forty-five (45) degrees shall be used in the service pipe to prevent clogging. A neat workmanlike connection shall be made. Bituminous and concrete joints should not be used between sections of similar materials. Concrete joints should not be used.

(Ord. No. 211, §§ 4.6—4.12, 5-12-80)