No person shall uncover, make any connections
with or opening into, use, alter or disturb any public sewer or appurtenance
thereof without first obtaining a written permit from the Board.
A separate and independent building sewer shall
be provided for every building, except that, where one building stands
at the rear of another on an interior lot and no private sewer is
available or can be constructed to the rear building through an adjoining
alley, court, yard or driveway, the building sewer from the front
building may be extended to the rear building and the whole considered
as one building sewer.
Existing building sewers may be used in connection
with new buildings only when they are found, on examination and test
by the Board, to meet all requirements of this Part 1.
The building sewer shall be tar-coated, service
weight cast-iron soil pipe, conforming to ASTM Specification A74 or
polyvinyl chloride (PVC) pipe conforming to ASTM D-3034 providing
a minimum Standard Dimensional Ratio (SDR) of 35 and a minimum pipe
stiffness of 46 at five-percent deflection. Joints shall be tight
and waterproof.
The size and slope of the building sewer shall
be subject to the approval of the Board, but in no event shall the
diameter be less than four inches, nor shall the slope of the pipe
be less than 1/4 inch per foot unless permission is granted by the
Board. In any case, the slope of the pipe shall not be less than 1/8
inch per foot.
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 feet
of any bearing wall, which might thereby be weakened. The depth shall
be sufficient to afford protection from frost but in no event shall
be less than three feet. 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. The ends
of building sewers which are not connected to the building drain of
the structure for any reason shall be sealed against infiltration
by a suitable stopper, plug or other approved means.
In all buildings in which any building drain
is too low to permit gravity flow to the public sewer, sewage or industrial
wastes carried by such drain shall be lifted by approved mechanical
means and discharged to the building sewer.
All excavations required for the installation
of a building sewer shall be open trench work unless otherwise approved
by the Board. Pipelaying and backfill shall be performed in accordance
with Sections 3 through 6 of ASTM Specifications C12, except that
no backfill shall be placed until the work has been inspected by the
Board.
The connection of the building sewer into a
public sewer shall be made at the location of the lateral connection
provided by the Town or directly to the sanitary sewer as directed
by the Board in individual circumstances. The owner shall indemnify
the Board from any loss or damage that may directly or indirectly
be occasioned by the installation of the building sewer. The method
of connections of the building sewer to the public sewer will be dependent
upon the type of pipe material used and in all cases shall be approved
by the Board.
When any building sewer is to serve a school, hospital or similar institution or public building or is to serve a complex of industrial or commercial buildings or which, in the opinion of the Board, will receive sewage or industrial wastes of such volume or character that frequent maintenance of said building sewer is anticipated, then such building sewer shall be connected to the public sewer through a manhole. The Board shall determine if and where this type of connection to the public sewer is required. Connections to existing manholes shall be made as directed by the Board. If required, a new manhole shall be installed in the public sewer pursuant to §
116-30 and the building sewer connection made thereto as directed by the Board.
There shall be installed an accessible cleanout
on the building sewer within five feet of the property line. The cleanout
shall have a watertight center-sunk brass plug.
At the discretion of the homeowner and/or plumber,
a single vented running trap may be installed on the building sewer
upstream from and within five feet of the cleanout. The vent pipe
shall be four inches in diameter, extend a minimum of six inches above
grade and have an approved steel cover.