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 County Health Department, in accordance with §
177-28. 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 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 §
177-31, 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 §
177-36, 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 Board until such construction inspections have been made so as to assure the Village 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 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 §
177-28 and shall be clearly shown and detailed on the plans and specifications submitted for approval. Force main details are covered in §§
177-43 and
177-44. When requested, the applicant shall submit, to the Superintendent and to the 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. 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 §§
177-41 and/or
177-42 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.
In lieu of hydrostatic testing (exfiltration
or infiltration), 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. Acceptance is based on
limits tabulated in the Specification Time Required for a 1.0 psig
Pressure Drop in the Uni-Bell PVC Pipe Association's Recommended Practice
For Low-Pressure Air Testing of Installed Sewer Pipe. 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 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 Superintendent. The pressure 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 §
177-28. Additional design requirements are:
A. Force main pipe material shall be:
(1) Ductile iron pipe. 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. Pipe and fittings shall be furnished with
push-on joints conforming to ANSI A21.11. 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 require prior written approval
of the Superintendent before being installed.
B. Trenching, bedding and backfilling shall be in accordance with §
177-33.
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 71/2°
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 90° 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.
Each test section length shall be as approved by the Superintendent,
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 Superintendent, and concurrence by the Village
Board, shall become the property of the Village, and shall thereafter
be operated and maintained by the Village. No sanitary sewer shall
be accepted by the Village 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, 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 Board, secured by a surety bond or such other security as
the Village Board may approve.