A.
All extensions to the sanitary sewer system owned
and maintained by the town shall be properly designed in accordance
with and in strict conformance with all requirements of the New York
State Department of Environmental Conservation.
B.
Plans and specifications for sewer extensions shall
be submitted to and approval obtained from the Director and engineer
and the New York State Department of Environmental Conservation or
County Health Department before construction may proceed.
C.
The design of sewers shall anticipate and allow for
flows from all possible future extensions or developments within the
immediate drainage area.
Sewer extensions may be constructed by the town
under public contract if expenditure and town plan modification procedures
required by state law are satisfied.
The property owner, builder or developer may
construct the necessary sewer extension, if such extension is approved
by the Director and the Board in accordance with the requirements
set forth in this chapter and in accordance with the conditions of
such approval and of the terms of the agreement between the town and
the owner regarding the sewer extension. He or they must pay for the
entire installation, including all expenses incidental thereto. Each
building sewer must be installed and inspected as required by this
chapter. The installation of the sewer extension must be subject to
inspection by the Director, and the expenses for this inspection shall
be paid for by the owner, builder or developer. The Director's decisions
shall be final in matters of quality and methods of construction.
The sewer, as constructed, must pass the infiltration or exfiltration
test set forth in this chapter before it is to be used.
Main line sewer design and construction shall
be in accordance with the following:
A.
B.
Construction materials and details shall meet the
following minimum requirements which may be more stringent than the
above standards.
(1)
Gravity sewers shall be PVC pipe meeting the requirements
of ASTM D 3034 with elastomeric joints in compliance with ASTM D 3212.
The nominal pipe size shall be eight inches or greater. The standard
dimension ratio (SDR) shall be 35 or less. Ductile iron pipe meeting
the requirements of AWWA C 151 shall be utilized where the minimum
vertical separation between sanitary sewers and water mains specified
in Recommended Standards for Sewage Works cannot be attained.
(2)
Pressure sewers (force mains) shall be PVC pipe meeting
the requirements or ASTM D 2241 with rubber-gasketed joints meeting
the requirements of ASTM D 3139. The standard dimension ratio shall
be 26 or less. The nominal pipe size for low pressure grinder systems
shall be not less than 2 1/2 inches. The nominal pipe size for
other pumping systems shall be not less than four inches.
(3)
Manholes and other belowground structures providing
access to the sewer system shall be of precast concrete construction
meeting the requirements of ASTM C 478. The minimum inside diameter
shall be four feet. Manholes 12 feet or more in depth shall have a
minimum inside diameter of five feet. Manholes and other structures
shall have a cast-iron frame and cover meeting the requirements of
ASTM A 48, Class 30. The size and shape shall meet the town's standard
design. Leveling brick, at least two courses thick but not more than
four courses thick, shall be used to provide adjustment to meet the
finish grade.
(4)
Pump stations shall be of the submersible pump, wet-well
type. All pump stations, except for grinder pump stations serving
a single residential unit, shall have two pumps, each adequate to
meet the anticipated peak demand. Except for small grinder pump stations,
the wet well shall be of precast concrete construction. Fiberglass
wet wells shall be permitted for small [serving one or two residential
units] grinder pump stations. Grinder pumps shall be the standard
established by the town and be of the same manufacturer. Each pump
station shall be equipped with a flashing alarm light indicating pump
failure. Where the location is not readily viewable from a traveled
public road, the Director may require additional failure alarm systems.
(5)
Manholes shall be installed wherever there is a change
in grade or alignment and at the ends of gravity sewer systems. The
spacing between manholes shall not exceed 350 feet.
(6)
Forcemains shall have cleanouts at intervals not greater
than 500 feet. Automatic air relief valves shall be installed at high
points in the forcemain where air pockets may develop.
(7)
Infiltration and exfiltration tests on gravity sewers
shall be performed as specified in Recommended Standards for Sewerage
Works, except the allowable infiltration/exfiltration shall not exceed
100 gallons per inch of pipe diameter per mile per day. The allowable
leakage at manholes shall not exceed 0.9 gallons per foot of depth
per day. Air testing may be substituted, if approved by the Director.
(8)
Forcemains shall be tested in accordance with AWWA
Specification C 600. The allowable leakage shall not exceed the following:
|
Test Pressure
(pounds per square inch)
|
Allowable Leakage per 100 Joints
(gallons per hour per inch of pipe diameter)
| |
|---|---|---|
|
50
|
0.096
| |
|
100
|
0.135
| |
|
150
|
0.166
|
(9)
All sewers shall be installed using open-trench methods
of construction, unless otherwise approved by the Director. Pipelaying
and backfilling shall be performed in accordance with ASTM Specification
D 2321, except that pipe bedding material shall be installed to a
depth of six inches below the pipe and to six inches above the crown
of the pipe. Pipe bedding material shall be No. 1 size clean crushed
gravel or stone. The pipe shall not be backfilled until inspected
and approved by the Director. Backfill to grade shall use suitable
material previously excavated except within public rights-of-ways
where the Street Superintendent shall define the backfill material
and the compaction effort required.
All sewer extensions constructed and deemed
acceptable to the engineer and Board shall become the property of
the town and shall thereafter be maintained by the town. Said sewers,
after their acceptance by the town, shall be guaranteed against defects
in materials or workmanship for 18 months. The guaranty shall be in
a form acceptable to the town. At the sole discretion of the town,
a completion bond or other security may be demanded as part of the
guaranty.
Prior to the connection of the sewer extension
to the public sewer, the owner shall provide the town with:
A.
Instruments of transfer of all property rights necessary
to operate and maintain the sewer extension with acceptable proof
of title in such property.
B.
The certification of a New York State licensed professional
engineer that the sewer extension was constructed in accordance with
the approved plans and specifications; and
No builder or developer shall be issued a building
permit for a new dwelling or structure requiring sanitary facilities
within the town unless a suitable and approved method of waste disposal
is proposed. All new developments shall have an approved system of
sanitary sewers.
