New sanitary sewers and all extensions to sanitary
sewers owned and operated by the City shall be designed, by a professional
licensed to practice sewer design in the state, in accordance with
the Recommended Standards for Sewage Works, as adopted by the Great
Lakes-Upper Mississippi River Board of State Sanitary Engineers ("Ten
State Standards"), and in strict conformance with all requirements
of the NYSDEC. Plans and specifications shall be submitted to and
written approval shall be obtained from the City, the Chenango County
Health Department, and the NYSDEC before initiating any construction.
The design shall anticipate and allow for flows from all possible
future extensions or developments within the immediate drainage area.
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 City and the Chenango County Health Department in accordance with §
456-41. 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 City expenses incidental thereto. Each street lateral shall be installed and inspected pursuant to Article
IV, and inspection fees shall be paid by the applicant prior to initiating construction. Design and installation of sewers shall be as specified in §
456-44, 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 Superintendent without prior notice. The Superintendent 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 §
456-48, before any building lateral is connected thereto. The Superintendent 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 Superintendent until such construction inspections have been made so as to assure the City of compliance with this chapter and any amendments or additions thereto. The Superintendent 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 Superintendent shall report all findings of inspections and tests to the City.
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 §
456-41, and shall be clearly shown and detailed on the plans and specifications submitted for approval. Additional force main details are covered in §
456-49. When requested, the applicant shall submit to the City and to the Chenango 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, 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 City. 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 Superintendent, 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. 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.
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. 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.
B. Test period. The test period, during which the test
measurements are taken, shall not be less than two hours.
C. Pipe lamping. Prior to testing, the section shall
be lamped. Any joint out of straight alignment shall be realigned.
D. Deflection testing. Also prior to testing, all plastic
pipe in the test section shall be tested for deflection. Deflection
testing shall involve the pulling of a ball, whose diameter is 95%
of the pipe inside diameter, through the pipe. Any joint with a deflection
greater than 5% shall be replaced. The test section shall be flushed
just prior to deflection testing.
E. Air testing alternative. In lieu of hydrostatic testing
(exfiltration or infiltration), 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. The air test shall be based on the time, measured
in seconds, for the air pressure to drop from 3.5 psi to 2.5 psi.
Acceptance is based on limits stated in ASTM Specification C-828.
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. If the test
section is below groundwater, the test pressure shall be increased
an amount sufficient to compensate for groundwater hydrostatic pressure,
however, the test pressure shall not exceed 10 psi. The test gauge
shall have been recently calibrated, and a copy of the calibration
results shall be made available to the Superintendent prior to testing.
Force mains serving sewage lifting devices, such as grinder pumps and pump stations, shall be designed in accordance with §
456-41. Additional design requirements are:
A. Trenching, bedding, and backfilling shall be in accordance with §
456-46.
B. Drain valves shall be placed at low points.
C. Automatic air relief valves shall be placed at high
points and at four-hundred-foot intervals, on level force main runs.
D. Air relief and drain valves shall be suitably protected
from freezing.
E. 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.
All sanitary sewers and extensions to sanitary
sewers constructed at the applicant's expense, after final approval
and acceptance by the Superintendent or City Engineer, and concurrence
by the City, shall become the property of the City, and shall thereafter
be operated and maintained by the City. Said sewers, after their acceptance
by the City, 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 City, secured
by a surety bond or such other security as the City may approve.