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 district operator and the New York State Health Department, Watertown Office, in accordance with §
125-25. Said property owner, builder, or developer shall pay for the entire installation, including a proportionate share of the treatment plant, intercepting or trunk sewers, pumping stations, force mains, and all other Town expenses incidental thereto. 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 §
125-29, and in conformance with Paragraphs 3 through 6 of ASTM Specification C-12. The installation of the sewer shall be subject to periodic inspection by the district operator, without prior notice. The district operator 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 infiltration test (or the exfiltration test, with prior approval), required in §§
125-34 through
125-40 before any building lateral is connected thereto. The district operator 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 Board until such construction inspections have been made so as to assure the Town Board of compliance with this article and any amendments or additions thereto. The district operator 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 district operator shall report all findings of inspections and tests to the Town Board.
Plans, specifications, and methods of installation shall conform to the requirements of this article. Components and materials of wastewater facilities not covered in this article, such as pumping stations, lift stations, or force mains shall be designed in accordance with §
125-25, and shall be clearly shown and detailed on the plans and specifications submitted for approval. Force main details are covered in §§
125-46 and
125-47. When requested, the applicant shall submit, to the district operator and to the New York State Health Department, Watertown Office, 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, upon request.
All sanitary sewers or extensions to sanitary sewers, including manholes, shall satisfy requirements of a final infiltration test before they will be approved and wastewater flow permitted by the Town. The infiltration rate shall not exceed 25 gallons per 24 hours per mile per nominal diameter in inches. An exfiltration test may be substituted for the infiltration test; the same rate shall not be exceeded. The exfiltration test shall be performed by the applicant, under the supervision of the district operator, who shall have the responsibility for making proper and accurate measurements required. The exfiltration 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 under test, and then measuring the loss of water, from the pipe section under test, by the amount of water which must be added to maintain the original level. However, under no circumstances shall the head at the downstream manhole exceed 10 feet or fill to within six inches of the top of the downstream manhole. Should this condition prevail, the testing methods in §§
125-39 and/or
125-40 shall be utilized. In this test, the test section must remain filled with water for at least 24 hours prior to taking any measurements. Exfiltration shall be measured by the drop of water level in a standpipe with a closed bottom end, or in one of the sewer manholes serving the test section. When a standpipe and plug arrangement is used in the upper manhole in the test section, there shall be some positive method for releasing entrapped air prior to taking any measurements.
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.
For purposes of determining the leakage rate of the test section,
manholes shall be considered as sections of forty-eight-inch diameter
pipe, five feet long. The maximum allowable leakage rate for such
a section is 1.1 gallons per 24 hours. If leakage exceeds the allowable
rate, then necessary repairs or replacements shall be made, and the
section retested.
The test period, during which the test measurements are taken,
shall not be less than two hours.
Prior to testing, the section shall be lamped. Any length of
pipe out of straight alignment shall be realigned.
Also prior to testing, all plastic pipe in the test section
shall 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.
Force mains serving sewage lifting devices, such as grinder pumps and pump stations, shall be designed in accordance with §
125-25. 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-21. 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 district operator and the Town Board before being
installed.
B. Trenching, bedding, and backfilling shall be in accordance with §
125-31.
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 1/2°
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 "T". The vertical arms of the "T" 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 "T" 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 district operator 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 district operator,
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 district operator, and concurrence by the Town Board, shall
become the property of the Town, and shall thereafter be operated
and maintained by the Town. No sanitary sewer shall be accepted by
the Town until four copies of as-built drawings have been so filed
with the district operator and the district operator has approved
the submitted drawings. Said sewers, after their acceptance by the
Town, shall be guaranteed against defects in materials or workmanship
for one year by the applicant. 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.