When a property owner, builder or developer proposes to construct sanitary sewers or extensions to sanitary sewers in an area proposed for subdivision, the plans, specifications, and method of installation shall be subject to the approval of the System Operator, the Town, the NYSDEC and the Orange County Health Department, in accordance with §
138-28. Said property owner, builder or developer shall pay for the cost of the review of the plans and for the entire installation, including the cost of the treatment plant, intercepting or trunk sewers, pumping stations, force mains, and all other Town expenses incidental thereto, including the cost of consultants hired by the Town. Each street lateral shall be installed and inspected pursuant to Article
VI, and inspection fees shall be paid by the applicant prior to initiating construction. Design and installation of sewers shall be as specified in §§
138-32 through
138-35, and in conformance with Paragraphs 3 through 6 of ASTM Specification C-12 or any future substituted specifications. The installation of the sewer shall be subject to periodic inspection by the System Operator, the Town Engineer and/or the Building Inspector without prior notice. The System Operator, the Town Engineer and/or the Building Inspector shall determine whether the work is proceeding in accordance with the approved plans and specifications and whether the completed work will conform with the approved plans and specifications. The sewer, as constructed, must pass the testing required in §
138-37E or
F, before any building lateral is connected thereto. The System Operator, the Town Engineer and/or the Town Building Inspector shall be notified 30 days in advance of the start of any construction actions so that such inspection frequencies and procedures as may be necessary or required may be established. No new sanitary sewers will be accepted by the Town until such construction inspections have been made so as to assure the Town of compliance with this chapter and any amendments or additions thereto. The System Operator, the Town Engineer and/or the Building Inspector has the authority to require such excavation as necessary to inspect any installed facilities if the facilities were covered or otherwise backfilled before they were inspected so as to permit inspection of the construction. The System Operator, the Town Engineer and/or the Building Inspector shall report all findings of inspections and tests to the Town.
Plans, specifications, and methods of installation shall conform to the requirements of this article. Components and materials of wastewater facilities not covered in this chapter such as pumping stations, lift stations, or force mains, shall be designed in accordance with §
138-28, and shall be clearly shown and detailed on the plans and specifications submitted for approval. Force main details are covered in §§
138-38 and
138-39. The applicant shall submit, to the Town, the NYSDEC, and the Orange County Health Department, all design calculations and other pertinent data to supplement review of the plans and specifications. Results of manufacturer's tests on each lot of pipe delivered to the job site shall also be furnished to the same entities.
All sanitary sewers or extensions to sanitary
sewers, including manholes, shall satisfy requirements of a final
test before they will be approved and wastewater flow permitted by
the Town. The tests are set forth in Subsections E and F below and
are subject to approval by the Town Engineer.
A. Test section. The test section shall be as ordered
or as approved, but in no event longer than 1,000 feet. In the case
of sewers laid on steep grades, the test length may be limited by
the maximum allowable internal pressure on the pipe and joints at
the lower end of the test section.
B. Test period. The test period, during which the test
measurements are taken, shall not be less than two hours or as determined
by the Town Engineer.
C. Pipe lamping. Prior to testing, the section shall
be lamped. Any length of pipe out of straight alignment shall be realigned.
D. Deflection testing. Also prior to testing, all plastic
pipes in the test section may, at the discretion of the Town Engineer,
be tested for deflection. Deflection testing shall involve the pulling
of a rigid ball or mandrel, whose diameter is 95% of the pipe inside
diameter, through the pipe. Any length of pipe with a deflection greater
than 5% shall be replaced. The test section shall be flushed just
prior to deflection testing. The test shall not be performed with
a mechanical pulling device.
E. Low-pressure air testing.
(1) Low-pressure air testing may be employed. Low-pressure
air tests shall conform to ASTM Specification C 828. All sections
to be tested shall be cleaned and flushed, and shall have been backfilled,
prior to testing. Air shall be added until the internal pressure of
the test section is raised to approximately 4.0 psig. The air pressure
test shall be based on the time, measured in seconds, for the air
pressure to drop from 3.5 psig to 2.5 psig.
(2) Acceptance is based on limits tabulated in "Specification
Time Required for a 1.0 psig Pressure Drop" in the Uni-Bell PVC Pipe
Association "Recommended Practice for Low-Pressure Air Testing of
Installed Sewer Pipe."
(3) Before pressure is applied to the line, all connections
shall be firmly plugged. Before the test period starts, the air shall
be given sufficient time to cool to ambient temperature in the test
section.
(4) If the test section is below groundwater, the test
pressure shall be increased by an amount sufficient to compensate
for groundwater hydrostatic pressure; however, the test pressure shall
not exceed 10 psi, or a lower pressure as required by the System Operator.
(5) The pressure test gauge shall have been recently calibrated,
and a copy of the calibration results shall be made available to the
System Operator and the Town the Engineer prior to testing.
F. Vacuum testing.
(1) In lieu of low pressure air testing, vacuum testing
may be employed for the testing of sewer lines and manholes. Sewer
lines and manholes shall be tested separately. All sewer lines to
be tested shall be cleaned and flushed, and shall have been backfilled,
prior to testing. The vacuum test shall be based on the time, measured
in seconds, for the vacuum to decrease from 10 inches of mercury to
nine inches of mercury for manholes and from seven inches of mercury
to six inches of mercury for sewers.
(2) Acceptance of manholes.
(a)
Acceptance of manholes is based on the following:
|
Manhole
Depth
(feet)
|
Manhole
Diameter
(feet)
|
Time to Drop 1 Inch
(from 10 to 9 inches)
(seconds)
|
---|
|
10 or less
|
4
|
120
|
|
10 to 15
|
4
|
150
|
|
15 to 25
|
4
|
180
|
(b)
For five-foot diameter manholes, add 30 seconds
to the times above.
(c)
For six-foot diameter manholes, add 60 seconds
to the times above.
(3) If the test on the manhole fails (the time is less
than that tabulated above), necessary repairs shall be made and the
vacuum test repeated until the manhole passes the test.
(4) Acceptance of sewers (seven inches Hg to six inches
Hg) is based on the time tabulated in the "Specification Time Required
for a 0.5 psig Pressure Drop" in the Uni-Bell PVC Pipe Association
"Recommended Practice for Low-Pressure Air Testing of Installed Sewer
Pipe."
(5) The vacuum test gauge shall have been recently calibrated,
and a copy of the calibration results shall be made available to the
System Operator and the Town Engineer prior to testing.
Force mains serving sewage lifting devices, such as grinder pumps and pump stations, shall be designed in accordance with §
138-28. Additional design requirements are:
A. Force main pipe material shall be:
(1) Polyvinyl chloride (PVC) plastic pipe. Pipe shall
conform to ASTM D2241. Materials used in the manufacture of PVC pipe
shall meet ASTM C1784. The minimum wall thickness shall be SDR-26.
Fittings shall conform to ASTM D2241. Joints and gaskets shall conform
to ASTM D2241, D1869, and F477.
(2) Other pipe materials. Other pipe materials require
prior written approval of the System Operator and the Town Engineer
before being installed.
B. Trenching, bedding, and backfilling shall be in accordance with §
138-34.
C. Joint preparation and assembly shall be in accordance
with the manufacturer's written instructions.
D. Anchorages, concrete blocking, and/or mechanical restraint
shall be provided when there is a change of direction of 7 1/2º
or greater.
E. Drain valves shall be placed at low points.
F. Automatic air relief valves shall be placed at high
points and at four-hundred-foot intervals, on level force main runs.
G. Air relief and drain valves shall be suitably protected
from freezing.
H. When the daily average design detention time, in the
force main, exceeds 20 minutes, the manhole and sewer line receiving
the force main discharge or the sewage shall be treated so that corrosion
of the manhole and the exiting line are prevented. The corrosion is
caused by sulfuric acid biochemically produced from hydrogen sulfide
anaerobically produced in the force main.
I. The force main shall terminate, in the receiving manhole,
at a PVC plastic sewer pipe tee. The vertical arms of the tee shall
be twice the diameter of the force main. The upper arm shall be at
least four feet long; the lower arm shall terminate in a PVC plastic
sewer pipe ninety-degree elbow in a flow channel directed to the manhole
exit pipe. The tee and its arms shall be securely fastened to the
inside surface of the manhole wall using corrosion-resistant anchors.
All force mains shall be subjected to hydrostatic
pressure of 150% of the normal operating pressure. The duration of
the test, at pressure, shall be at least two hours. Before conducting
the test, the pipe shall be filled with water, and all air shall be
expelled. During the test, water shall be added, as needed, to maintain
the test pressure. The amount of water added shall be recorded so
as to calculate leakage. Leakage shall not exceed 25 gallons per day
per mile per inch nominal pipe diameter. During the test, the owner
and the System Operator and the Town Engineer shall walk the route
of the force main and examine the exposed pipe and the ground covering
any backfilled pipe to discover leaks. Leakage in excess of that specified
above shall be corrected with new material at the owner's expense
and the test repeated. Any observed leaks shall be repaired at the
owner's expense. Each test section length shall be as approved by
the Town Engineer, but in no event longer than 1,000 feet.
All sanitary sewers and extensions to sanitary
sewers constructed at the applicant's expense, after final approval
and acceptance by the System Operator and the Town Engineer and concurrence
by the Town Board, shall remain the property of the owner and shall
thereafter be operated and maintained by the owner, unless the Town
chooses to take over ownership, control and operation. All sanitary
sewers shall be subjected to high-pressure testing and monitored with
televised equipment. The recordings shall be given to the System Operator
for record. No sanitary sewer shall be accepted by the Town until
four copies of as-built drawings have been so filed with the System
Operator and the System Operator and the Town Engineer have approved
the submitted drawings. Said sewers, after their acceptance by the
Town, shall be guaranteed against defects in materials or workmanship
by the applicant for at least one year or for such longer time as
determined by the Town. The guarantee shall be in such form and contain
such provision as deemed necessary by the Town Board, secured by a
surety bond or such other security as the Town Board may approve.