[Amended 6-13-1988 by L.L. No. 1-1988]
Building sewers shall be either cast-iron soil
pipe or polyvinyl chloride sewer pipe conforming to the following:
A. Cast-iron soil pipe.
(1) Materials. All cast-iron soil pipe shall be manufactured,
tested, coated and inspected in accordance with all the provisions
of ASTM Specification A74, Cast-Iron Soil Pipe and Fittings. All dimensions,
weights and markings of cast-iron soil pipe shall conform to the requirements
of the American National Standards Institute, Designation A112.5.1,
except spigot ends shall be plain end for receiving neoprene gaskets.
Except where the use of extra-heavy cast-iron soil pipe shall be required
by the Engineer, cast-iron soil pipe shall be service weight and shall
be furnished in nominal five-foot laying lengths or less.
(2) Fittings. All fittings and specials of cast-iron soil
pipe shall conform in every respect to the pipe with which they are
used. Cleanouts for laterals shall be installed with a wye fitting,
extended to finished grade with cast-iron soil pipe and closed with
a brass screwed-end plug.
(3) Gasket joints. In every instance where hub and plain-end
cast-iron soil pipe is installed, gasket joints shall be used. Gasket
joints shall be a neoprene compression-type gasket which provides
a positive double seal in the assembled joint. The gasket shall be
a premolded one-piece unit, designed for joining cast-iron hub and
plain-end soil pipe and fittings. The assembled joint shall be sealed
by compression of the gasket between the exterior surface of the spigot
and the interior surface of the hub. The joint shall be assembled
following the manufacturer's recommendations using acceptable lubricant
and special pipe-coupling tools designed for that purpose. Lubricant
shall be a bland, flax-base, nontoxic material and shall not chemically
attack the gasket material. Acceptable gaskets are Ty-Seal joint as
manufactured by Tyler Pipe and Foundry Company, Tyler, Texas, or Dual-Tite,
as manufactured by Buffalo Pipe and Foundry Corp., Buffalo, New York,
or equal.
B. Polyvinyl chloride sewer pipe.
(1) Material. All polyvinyl chloride (PVC) pipe and fittings
shall be Class SDR-35 and shall meet or exceed all of the requirements
of ASTM Specification D3034, Type PSM Polyvinyl Chloride (PVC) Sewer
Pipe and Fittings; or ASTM Specification F789, Type PS-46 Poly (Vinyl
Chloride) (PVC) Plastic Gravity Flow Sewer Pipe and Fittings; or ASTM
Specification 679, Type Poly (Vinyl Chloride) (PVC) Large-Diameter
Plastic Gravity Sewer Pipe and Fittings. All pipe shall be suitable
for use as a gravity sewer conduit with integral bell and elastomeric
gasket joints. The gasket shall meet the requirements of ASTM F477.
The bell shall consist of an integral wall section which securely
locks the solid cross-section elastomeric ring into position. Standard
lengths shall be 12 feet six inches and 20 feet PMS one inch. Acceptable
manufacturers are Johns-Manville, Certain-Teed, Carlon or the equal.
(2) Fittings. All fittings and accessories shall be as
manufactured and furnished by the pipe supplier and have bell and/or
spigot configurations identical to that of the pipe to which they
are connected. Cleanouts for laterals shall be installed with a wye
fitting extended to finished grade with cast-iron soil pipe through
use of an acceptable connection and closed with a brass screwed-end
plug.
(3) Pipe stiffness. Minimum pipe stiffness (F/ y) at 5%
deflection shall be 46 pounds per square inch for all sizes when tested
in accordance with ASTM Designation D2412, External Loading Properties
of Plastic Pipe by Parallel Plate Loading.
(4) Installation. Extreme care shall be taken to provide
proper pipe foundations and pipe sidefills in accordance with the
recommendations of the pipe manufacturer, maintaining accurate alignment
of the pipe at all times.
C. Relation to water mains.
(1) Horizontal separation. Sewers shall be laid at least
10 feet (3.0) meters) horizontally from any existing or proposed water
main. The distance shall be measured edge-to-edge. In cases where
it is not practical to maintain a ten-foot separation, the Commission
may allow deviation on a case-by-case basis, if supported by data
from the design engineer. Such deviation may allow installation of
the sewer closer to a water main, provided that the water main is
in a separate trench or on an undisturbed earth shelf located on one
side of the sewer and at an elevation so the bottom of the water main
is at least 18 inches (46 centimeters) above the top of the sewer.
(2) Crossings. Sewers crossing water mains shall be laid
to provide a minimum vertical distance of 18 inches (46 centimeters)
between the outside of the water main and the outside of the sewer.
This shall be the case where the water main is either above or below
the sewer. The crossing shall be arranged so that the sewer joints
will be equidistant and as far as possible from the water main joints.
Where a water main crosses under a sewer, adequate structural support
shall be provided for the sewer to prevent damage to the water main.
(3) Special conditions. When it is impossible to obtain
proper horizontal and vertical separation as stipulated above, the
sewer shall be designed and constructed equal to the water pipe and
shall be pressure treated to assure watertightness prior to backfilling.
D. Mandatory use of cast-iron soil pipe. Extra-heavy
cast-iron soil pipe may be required by the Engineer where the building
sewer is likely to be damaged by tree roots or where located under
roads, streets and/or other drives.
E. Installation on fill or unstable ground. If installed
on fill or unstable ground, the building sewer shall be of cast-iron
soil pipe, although other pipe material may be permitted if such pipe
is uniformly supported on a poured concrete cradle approved by the
Engineer. Special excavation and filling methods and materials, including
the use of porous fabric (geotextiles) and/or select material, may
be required by the Engineer. The distance between consecutive joints
of nonmetallic pipe, as measured along the center line of the installed
pipe, shall not exceed 12 feet six inches except under abnormal circumstances,
in which case this dimension may be exceeded if approved in advance
by the Engineer.
F. Size and slope of laterals. The size and slope of
building or street laterals shall be subject to approval by the Engineer,
but in no event shall the internal diameter of the pipe be less than
four inches, nor shall the slope of the pipe be less than 1/8 inch
per foot, nor shall velocity of flow in the pipe be less than two
feet per second.
When any street lateral is to serve a school, hospital or similar institutional or public housing or is to serve a complex of industrial or commercial buildings or which, in the opinion of the Engineer, will receive domestic sewage or industrial wastes of such volume or character that frequent maintenance of said building and street lateral is anticipated, then such street lateral shall be connected to the public sewer through a manhole. The Engineer 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 Engineer. If required, a new manhole shall be installed in the public sewer pursuant to Article
IV and the lateral connection made thereto as directed by the Engineer.
All excavations required for the installation
of a building or street lateral shall be open trench work unless otherwise
approved by the Engineer. Pipe laying and backfill, regardless of
pipe material used, shall be performed in general accordance with
Paragraphs 3 through 6 of ASTM Specification C-12, except that trench
width measured at the top of the installed pipe shall not exceed 24
inches, and except that no backfill shall be placed until the work
has been inspected. The depth of cover over the pipe shall be sufficient
to afford protection from frost, but in no case shall such depth be
less than four feet six inches unless prior approval has been granted
by the Engineer, in writing, to permit a lesser depth of cover, and
then under such conditions the Engineer may impose.
All new or reconstructed building sewers shall
be fitted with a standard wye fitting and a 1/8 (45º) bend with
appropriate pipe to provide a cleanout in the vicinity of the curbline.
The cleanout shall be of similar material as the building sewer or
as otherwise required by the Engineer and shall be provided with a
secured cap at the ground level. Installation, location and configuration
shall be as required by the Engineer, and sufficient information shall
accompany the permit application.
Whenever possible, the building sewer shall
be brought to the building at an elevation below the basement floor.
In all buildings in which any building drain is too low to permit
gravity flow to the public sewer, sanitary sewage carried by such
building drain shall be lifted by means approved by the Engineer and
discharged to the building sewer.
No person(s) shall make connections of roof
downspouts, foundation drains, areaway drains or other sources of
surface runoff or groundwater to a building sewer or building drain
which, in turn, is connected directly or indirectly to a public sanitary
sewer unless such connection is approved by the Engineer for purposes
of disposal of polluted surface drainage.
All excavations for building sewer installation
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.
An interior cleanout fitting shall be provided
for each building lateral at a readily accessible location, preferably
just inside the basement wall. The fitting shall contain a forty-five-degree
branch with removable plug, and be so positioned that sewer cleaning
equipment can be inserted therein to clean the building lateral.
No structure shall be connected to the sanitary
sewer system unless there is a soil line extended to a point above
the roof and properly vented or otherwise vented in a manner approved
by the Engineer. In existing public or private buildings, dwellings
or stores not properly vented, a running trap with double hub vent
is required, and it shall be installed in a manner which has been
approved by the Engineer. Grease traps will be installed where the
Commission or its duly authorized agent may direct. Grease traps must
be kept clean at all times, at the owner's expense.