New sanitary sewers and all extensions to sanitary
sewers owned and operated by the Village of Carthage 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 Superintendent,
the Jefferson 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 Superintendent and the Jefferson County Health Department in accordance with §
110-28. 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 Village of Carthage 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 §
110-33, 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 §
110-35, 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 Village of Carthage Board until such construction inspections have been made so as to assure the Village of Carthage Board 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 Village of Carthage 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 chapter, such as pumping stations, lift stations or force mains, shall be designed in accordance with §
110-28 and shall be clearly shown and detailed on the plans and specifications submitted for approval. Force main details are covered in §§
110-42 and
110-43 of this chapter. When requested, the applicant shall submit to the Superintendent and to the Jefferson 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 Village of Carthage. 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. 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 §§
110-40 and
110-41 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
sections, 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 §
110-28. Additional design requirements are as follows:
A. Force main pipe material shall be:
(1) Ductile iron pipe.
(a)
Pipe shall conform to ANSI A21.51. The minimum
wall thickness shall be Class 52 (ANSI A21.50). The pipe shall be
clearly marked with either "D" or "DUCTILE." Fittings shall conform
to ANSI A21.10.
(b)
Pipe and fittings shall be furnished with push-on
joints conforming to ANSI A21.11.
(c)
Pipe and fittings shall be cement mortar lined
and have an internal and external bituminous seal coating.
(2) Polyvinyl chloride (PVC) plastic pipe. Pipe shall
conform to ASTM D-2241. Materials used in the manufacture of PVC pipe
shall meet ASTM C-1784. The minimum wall thickness shall be SDR-21.
Fittings shall conform to ASTM D-2241. Joints and gaskets shall conform
to ASTM D-2241, D-1869 and F-477.
(3) Other pipe materials. Other pipe materials require
prior written approval of the Superintendent before being installed.
B. Trenching, bedding and backfilling shall be in accordance with §
110-33.
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 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 Superintendent 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.
All sanitary sewers and extensions to sanitary
sewers constructed at the applicant's expense, after final approval
and acceptance by the Superintendent and concurrence by the Village
of Carthage Board, shall become the property of the Village of Carthage
and shall thereafter be operated and maintained by the Village of
Carthage. No sanitary sewer shall be accepted by the Village of Carthage
until four copies of as-built drawings have been so filed with the
Superintendent and the Superintendent has approved the submitted drawings.
Said sewers, after their acceptance by the Village of Carthage, shall
be guaranteed against defects in materials or workmanship for one
year by the applicant. The guaranty shall be in such form and contain
such provision as deemed necessary by the Village of Carthage Board,
secured by a surety bond or such other security as the Village of
Carthage Board may approve.