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. Where building sewers are to serve multiple structures,
there shall be provided at least one separate building sewer for each
group of four living units.
Existing building sewers may be used in connection with new
buildings only when they are found, on examination and test by the
Superintendent, to meet all requirements of this chapter.
The building sewer shall be tar-coated, extra-heavy cast-iron
soil pipe conforming to ASTM Specification A74 and American Standards
Association (ASA) Specification A-40.0 and ABS pipe specifications
ANSI-ASTM D-2751 (latest revision). All joints shall be solvent-welded,
Type SC. All pipe couplings and fittings shall be tight and waterproof.
Any part of the building sewer that is located within 10 feet of a
water service pipe shall be constructed of cast-iron soil pipe with
leaded joints. Cast-iron pipe with leaded joints shall be required
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 local governing
body. Building sewer pipe shall have a maximum length of five feet
between joints.
The size and slope of the building sewer shall be subject to
the approval of the local governing body, but in no events shall the
diameter be less than four inches, nor shall the slope of the pipe
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 the building
sewer 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 local
governing body. Pipelaying and backfill shall be performed in accordance
with Sections 3 through 6 of ASTM Specification C12, except that no
backfill shall be placed until the work has been inspected and except
that the trench width measured at the top of the installed pipe shall
not exceed 24 inches.
The connection of the building sewer into an existing public sewer shall be made at the property line. Except as provided under §§
94-21 and
94-22, if the portion of the building sewer located in the street or right-of-way has not previously been provided, such will be constructed from the existing public sewer to the property line by the owner, builder or developer upon submittal of the property request and obtaining approval and consent of the governing body. All costs and expense incident to the installation and connection of the entire length of building sewer shall be borne by the owner. The owner shall indemnify the local governing body from any loss or damage that may directly or indirectly be occasioned by the installation of the building sewer. The method of connection of the building sewer to the public sewer (at the property line) will be dependent upon the type of pipe material used and in all cases shall be approved by the local governing body.
All excavations for building sewer installations shall be adequately
guarded with barricades and lights so as to protect the public from
hazard. Streets, sidewalks, parkways and other public property disturbed
in the course of the work shall be restored in a manner satisfactory
to the village.
When any building sewer is to serve a school, hospital or similar institution or is to serve a complex of industrial or commercial buildings, or, in the opinion of the administrative body, 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 administrative body 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 Superintendent. If required, a new manhole shall be installed in the public sewer pursuant to §
94-23 and the building sewer connection made thereto as directed by the Superintendent.