Sewer extensions, including individual building sewers from
the public sewer to the property line, may be constructed by the City
under public contract if, in the opinion of the Common Council, the
number of properties to be served by such extension warrants its cost.
Under this arrangement the property owner shall pay for the building
sewer from the public sewer to his residence or place of business
in accordance with the requirements of this article. Property owners
may propose sewer extensions within the incorporated City by drafting
a written petition, signed by a majority of the benefiting property
owners, and filing it with the Common Council. The cost of such extensions
may be assessed to the benefited property owners in any manner determined
by the Common Council.
If the City does not elect to construct a sewer extension under public contract, the property owner, builder, or developer may construct the necessary sewer extension, if such extension is approved by the Common Council in accordance with the requirements of Section 27-118. He or they must pay for the entire installation, including all expenses incidental thereto. Each building sewer must be installed and inspected as previously required and the inspection fees shall be paid. Design of sewers shall be as specified in Section 27-118. The installation of the sewer extension must be subject to periodic inspection by the Director and 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 exfiltration test required in Section 27-119 before it is to be used. The cost of sewer extension thus made shall be absorbed by the developers or the property owners, including all building sewers. Such extension, when built, shall become a public sewer, subject to complete control and authority of the City.
(a)
All extensions to the sanitary sewer system owned and maintained
by the City shall be properly designed in accordance with and in strict
conformance with all requirements of the State Department of Health.
Plans and specifications for sewer extensions shall be submitted to
and approval obtained from the Director and the State Department of
Health before construction may proceed. The design of sewers must
anticipate and allow for flows from all possible future extensions
or developments within the immediate drainage area.
(b)
Sewer design shall be in accordance with the following provisions. Pipe materials shall be either extra-strength vitrified clay conforming to ASTM Specification C-200; or reinforced concrete conforming to ASTM Specification C-76; or Plastic Truss Pipe ASTM D-1788-62T Type I or IV ABS material in municipal sewer pipe quality. No standard strength clay pipe or nonreinforced concrete pipe shall be used. Minimum internal pipe diameter shall be eight inches. Joints for each kind of pipe shall be designed and manufactured such that "O" ring gaskets of the "snap-on" type are employed. Gaskets shall be continuous, solid, natural, or synthetic rubber and shall provide a positive compression seal in the assembled joint such that the requirements of Section 27-119 are met. Joint preparation and assembly shall be in accordance with the manufacturer's recommendations. Wye branch fittings shall be installed for connection to building sewers in accordance with Section 27-138. Trench widths as measured just above the crown of the pipe shall not exceed the following:
|
Pipe Diameter
(inches)
|
Trench Width
(feet, inches)
|
|---|---|
|
8
|
3,3
|
|
10
|
3,6
|
|
12
|
3,9
|
|
14
|
4,0
|
|
If the trench widths are found, during field inspection, to exceed the limits in the table in Subsection (b) of this section, the sewer pipe shall be encased with a minimum of six inches of concrete. Pipe shall be firmly and evenly bedded on a minimum of three inches of 1A or 1 crushed stone (NYSDPW Specification). Pipe thickness and field strength shall be calculated on the following criteria:
|
(c)
Utilizing the above information, design shall then be made as outlined
in Chapter IX of the Water Pollution Control Federation Manual of
Practice No. 9, "Design and Construction of Sanitary and Storm Sewers."
(d)
Manholes shall be constructed at all changes in slope or alignment
or at intervals not exceeding 400 linear feet. The manholes shall
be constructed with a poured 3,000 psi concrete base 12 inches thick,
steel troweled concrete or mortar bench walls and inverts, and precast
four-foot diameter concrete manhole barrel sections with concentric
tapered top section, as specified by ASTM C-478. The manhole frame
and cover shall be the standard design of the City and shall be set
with no less than two courses of brick underneath to allow for later
adjustment in elevation. All joints shall be sealed against infiltration.
No manholes shall be constructed without steps or ladder rungs.
(a)
All sewers shall satisfy requirements of a final exfiltration test
before they will be approved and sewage flow accepted from them by
the City. This test consists of filling the pipe with water to provide
a head of at least five feet above the top of the pipe or five feet
above groundwater, whichever is higher, at the highest point of the
pipeline under test, and then measuring the loss of water from the
line by the amount which must be added to maintain the original level.
In this test, the line must remain filled with water for at least
24 hours prior to the taking of measurements. Exfiltration shall be
measured by the drop of water level in a standpipe with closed bottom
end, or in one of the sewer manholes available for convenient measuring.
(b)
When a standpipe and plug arrangement is used in the upper manhole
of a line under test, there must be some positive method of releasing
entrapped air in the sewer prior to taking measurements. The test
length intervals for either type of test shall be as ordered or approved
but in no event shall they exceed 1,000 feet. In the case of sewers
laid on steep grades, the length of line to be tested by exfiltration
at any one time may be limited by the maximum allowable internal pressure
on the pipe and joints at the lower end of the line. The test period,
wherein the measurements are taken, shall not be less than two hours
in either type of test.
(c)
The total leakage of any section tested shall not exceed the rate
of 100 gallons per mile of pipe per 24 hours per inch of nominal pipe
diameter. For purposes of determining the maximum allowable leakage,
manholes shall be considered as sections of forty-eight-inch-diameter
pipe, five feet long. The equivalent leakage allowance shall be 4.5
gallons per manhole per 24 hours, for forty-eight-inch-diameter manholes.
If leakage exceeds the specified amount, the necessary repairs or
replacements required shall be made to permanently reduce the leakage
to within the specified limit, and the test shall be repeated until
the leakage requirement is met.
All sewer extensions constructed at the property owner's, builder's,
or developer's expense, after final approval and acceptance by the
Director, shall become the property of the City and shall thereafter
be maintained by the City. Such sewers, after their acceptance by
the City, shall be guaranteed by the owner's builder or developer
against defects in materials, or workmanship for 18 months. The guarantee
shall be in a form provided for by the City. At the sole discretion
of the City, a completion bond or certificate check may be demanded
as part of the guarantee.
