[Amended 8-17-1998 by L.L. No. 6-1998]
New sanitary sewers, pumping stations and extensions
to the sanitary system owned and maintained by the Village shall be
properly designed in accordance with the Recommended Standards for
Sewage Works as adopted by the Great Lakes-Upper Mississippi River
Board of State Sanitary Engineers and in strict conformance with all
requirements of the New York State Department of Health and the New
York State Department of Environmental Conservation. Plans and specifications
for new sewers, pumping stations and sewer extensions shall be submitted
to, and approval obtained from, the Village Engineer and New York
State Department of Health before construction may proceed. The design
of sewers must anticipate and allow for flows from all possible future
extensions or developments within the immediate drainage area.
[Amended 8-17-1998 by L.L. No. 6-1998]
Sewer extensions, including pumping stations, individual building sewers to the public street right-of-way, may be constructed by the Village under public contract if, in the opinion of the Village Board, Village Engineer and DPW Superintendent, the number of properties to be served by such extension warrants its cost. Under this arrangement, the property owner shall pay for and install the building sewer from the public street right-of-way to his residence or place of business in accordance with the requirements of Article IV. Property owners may propose sewer extensions within the incorporated Village by drafting a written petition and filing it with the Village Board. The cost of the sewer extensions may be assessed to the benefitted property owners in any manner determined by the Village Board.
[Amended 8-17-1998 by L.L. No. 6-1998]
If the Village does not elect to construct a sewer extension under public contract, the property owner, builder or developer may construct the necessary sewer extension if this extension is approved by the Village Board in accordance with the requirements of § 163-29. He or they must pay for the entire installation, including all expenses incidental thereto. Each building sewer installed must be installed and inspected as previously required and the inspection fees shall be paid. Design of sewer and pumping stations shall be as specified in Article V. The installation of the sewer extension must be subject to periodic inspection by the Engineer or Village, and the expenses for the Engineer's services for said inspection shall be paid for by the owner, builder or developer. The Engineer's decisions shall be final in matters of quality and methods of construction. The sewer, as constructed, must pass the exfiltration test required in § 163-33 before it is to be used. The cost of the sewer extension thus made shall be absorbed by the developers or the property owners, and trunk sewers and sewage treatment plant and their proportion of operational and maintenance costs thereof, as outlined in Article XI.
A.
Sewer design shall be in accordance with the following
provisions:
(1)
Pipe material shall be either cement lined ductile iron pipe and fittings conforming to AWWA Standard C151 (ANSI A21.51) and AWWA C111 (ANSI A21.11), respectively; or polyvinyl chloride (PVC) pipe and fittings conforming to either ASTM Specification D3034-85b or ASTM F789-85, and ASTM F477 for the gasket. Minimum stiffness for PVC pipe shall be 46 psi at 5% deflection when tested in accordance with ASTM Designation D2412. No asbestos cement pipe, clay pipe or concrete pipe shall be used. Minimum internal pipe diameter shall be eight inches. Joints for each kind of pipe shall be designed and manufactured such that "O" ring gaskets of the "snap-on" type are employed. Gaskets shall be continuous, solid, natural or synthetic rubber, and shall provide a positive compression seal in the assembled joint such that the requirements of § 163-33 are met. Joint preparation and assembly shall be in accordance with the manufacturer's recommendations. Y-branch fittings shall be installed for connection to building sewers in accordance with § 163-16. Trench widths as measured just above the crown of the pipe shall not exceed the following:
|
Pipe Diameter
(Inches)
|
Trench Width
| |
|---|---|---|
|
8
|
3 feet 3 inches
| |
|
10
|
3 feet 6 inches
| |
|
12
|
3 feet 9 inches
| |
|
14
|
4 feet 0 inches
|
(2)
If the trench widths are found, during field inspection,
to exceed the limits in the above table, the sewer pipe shall be encased
with a minimum of six inches of concrete. Pipe shall be firmly and
evenly bedded on a minimum of three inches of No. 1A or No. 1 crushed
stone (NYSDOT Specification). Pipe thickness and field strength shall
be calculated on the following criteria:
|
Safety factor
|
-
|
1.5
| |
|
Load factor
|
-
|
1.7
| |
|
Weight of soil
|
-
|
120 pounds per cubic foot
| |
|
Wheel loading
|
-
|
16,000 pounds
|
B.
Utilizing the above information, design shall then
be made as outlined in Chapter IX of the Water Pollution Control Federation
Manual of Practice No. 9, Design and Construction of Sanitary and
Storm Sewers.
C.
Manholes shall be constructed at all changes in slope
or alignment or at intervals not exceeding 400 linear feet. The manholes
shall be constructed with a poured 4,000 pounds per square inch (4,000
psi) concrete based 12 inches thick, steel troweled concrete or mortar
inverts, and bench walls and precast four-foot diameter concrete manhole
barrel sections and a concentric tapered top section as specified
by ASTM Specification C-478. The manhole frame and cover shall be
the standard design of the Village and shall be set with no less than
two courses of brick underneath to allow for later adjustment in elevation.
All joints shall be sealed against infiltration. No steps or ladder
rungs shall be installed in manholes.
A.
All sewers shall satisfy requirements of a final exfiltration
test before they will be approved and sewage flow accepted from them
by the Village. This 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 of the pipeline under test, and then measuring the loss of water
from the line by the amount which must be added to maintain the original
level. In this test, the line must remain filled with water for at
least 24 hours prior to the taking of measurements. Exfiltration shall
be measured by the drop of water level in a standpipe with closed
bottom end, or in one of the sewer manholes available for convenient
measuring.
B.
When a standpipe and plug arrangement is used in the
upper manhole of a line under test, there must be some positive method
of releasing entrapped air in the sewer prior to taking measurements.
The test-length intervals for either type of test shall be as ordered
or approved, but in no event shall they exceed 1,000 feet. In the
case of sewers laid on steep grades, the length of line to be tested
by exfiltration at any one time may be limited by the maximum allowable
internal pressure on the pipe and joints at the lower end of the line.
The test period, wherein the measurements are taken, shall not be
less than two hours in either type of test.
C.
The total leakage of any section tested shall not
exceed the rate of 100 gallons per mile of pipe per 24 hours per inch
of nominal pipe diameter. For purposes of determining the maximum
allowable leakage, manholes shall be considered as sections of forty-eight-inch
diameter pipe five feet long. The equivalent leakage allowance shall
be 4.5 gallons per manhole per 24 hours for forty-eight-inch diameter
manholes. If leakage exceeds the specified amount, the necessary repairs
or replacements shall be made to permanently reduce the leakage to
within the specified limit, and the tests shall be repeated until
the leakage requirement is met.
Amended [8-17-1998 by L.L. No. 6-1998]
All sewer extensions including pumping stations,
constructed at the property owner's, builder's or developer's expense,
after final approval and acceptance by the Engineer, shall become
the property of the Village and shall thereafter be maintained by
the Village. Said sewer extensions, after their acceptance by the
Village, shall be guaranteed for one year against defects in materials
and workmanship. The guaranty shall be in a form provided for by the
Village. At the sole discretion of the Village, a completion bond
or certified check may be demanded as part of the guaranty.
No builder or developer shall be issued a building
permit for a dwelling or structure requiring sanitary facilities within
the Village unless a suitable and approved method of waste disposal
is proposed. All new housing developments, commercial, industrial
and institutional establishments shall be provided with an approved
system of sanitary sewers, and when required by the Village Board,
shall also be provided with an approved system of storm sewers.
A.
All property owners whose wastewater discharge to
a location in the sewage treatment plant which does not receive treatment
by existing preliminary treatment facilities located south of the
New York State Thruway, must provide preliminary treatment facilities
for their wastewater discharges prior to entry into the sewage treatment
plant.
B.
The preliminary treatment must include continuous
flow measurement, adequate screenings and grit removal. The preliminary
treatment facilities will be subject to review by the Village Board
of Trustees and Engineer, and will be maintained by the owner.
Amended [8-17-1998 by L.L. No. 6-1998]
A.
Local utilities shall be contacted to verify construction
plans and to make arrangements to disconnect all utility services
where required to undertake the construction work. The utility services
shall later be reconnected. The work shall be scheduled so that there
is minimum inconvenience to local residents. Residents shall be provided
proper and timely notice regarding disconnection of utilities.
B.
The construction right-of-way shall be cleared only
to the extent needed for construction. Clearing consists of removal
of trees which interfere with construction, removal of underbrush,
logs and stumps and other organic matter, removal of refuse, garbage
and trash, removal of ice and snow, and removal of telephone and power
poles, and posts. Any tree which will not hinder construction shall
not be removed, and shall be protected from damage by any construction
equipment. Debris shall not be burned, but hauled for disposal in
an approved manner.
C.
The public shall be protected from personal and property
damage as a result of the construction work.
D.
Traffic shall be maintained at all times in accordance
with applicable highway permits. Where no highway permits are required,
at least 1/2 of a street shall be kept open for traffic flow.
E.
Erosion control shall be performed throughout the
project to minimize the erosion of soils onto lands or into waters
adjacent to or affected by the work. Erosion control can be effected
by limiting the amount of clearing and grubbing prior to trenching,
proper scheduling of the pipe installation work, minimizing time of
open trench, prompt grading and seeding and filtration of drainage.
F.
The trench shall be excavated only wide enough for
proper installation of the sewer pipe, manhole and appurtenances.
Allowances may be made for sheeting, dewatering and other similar
actions to complete the work. Roads, sidewalks and curbs shall be
cut by sawing before trench excavation is initiated.
G.
Under ordinary conditions, excavation shall be by
open cut from the ground surface. However, tunneling or boring under
structures other than buildings may be permitted. Such structures
include crosswalks, curbs, gutters, pavements, trees, driveways and
railroad tracks.
H.
Open trenches shall be protected at all hours of the
day with barricades, as required.
I.
Trenches shall not be open for more than 30 feet in
advance of pipe installation nor left unfilled for more than 30 feet
in the rear of the installed pipe, when the work is in progress, without
permission of the Village. When work is not in progress, including
overnight, weekends and holidays, the trench shall be backfilled to
ground surface.
J.
The trench shall be excavated approximately six inches
deeper than the final pipe grade. When unsuitable soils are encountered,
these shall be excavated and replaced with select materials.
K.
Ledge rock, boulders and large stones shall be removed
from the trench sides and bottom. The trench shall be over-excavated
at least 12 inches for five feet at the transition from rock bottom
to earth bottom, centered on the transition.
L.
Maintenance of grade, elevation and alignment shall
be done by some suitable method or combination of methods.
M.
No structure shall be undercut unless specifically
approved by the Village.
N.
Proper devices shall be provided and maintained operational
at all times to remove all water from the trench as it enters. At
no time shall the sewer line be used for removal of water from the
trench.
O.
To protect workers and to prevent caving, shoring
and sheeting shall be used as needed. Caving shall not be used to
backfill the trench. Sheeting shall not be removed but cut off no
lower than one foot above the pipe crown nor no higher than one foot
below final grade and left in the trench during backfill operations.
P.
The pipe barrel shall be supported along its entire
length on a minimum of six inches of crusher run maximum one-half-inch
stone free of organic material. This foundation shall be firmly tamped
in the excavation.
Q.
Bell holes shall be hand excavated as appropriate.
R.
Pipe shall be laid from low elevation to high elevation.
The pipe bell shall be upgradient; the pipe spigot shall be downgradient.
S.
The joints shall be made and the grade and alignment
checked and made correct.
T.
The pipe shall be in straight alignment.
U.
When a smaller sewer joins a larger one, the invert
of the larger sewer shall be lowered sufficiently to maintain the
same hydraulic gradient. An approximate method which may be used for
securing this result is to place the 0.8 depth of both sewers at the
same elevation.
V.
Crushed stone shall be placed over the laid pipe to
a depth of at least six inches. The embedment of thermoplastic pipe
shall in accordance with ASTN D2321 using Class 1A of 1B backfill
materials. Care shall be exercised so that stone is packed under the
pipe haunches. Care shall be exercised so that the pipe is not moved
during placement of the crushed stone.
W.
The migration of fines from surrounding backfill or
native soils shall be restricted by gradation of embedment materials
or by use of suitable filter fabric.
X.
The remaining portion of the trench above the pipe
embedment shall be backfilled in foot lifts which shall be firmly
compacted. Compaction near/under roadways, driveways, sidewalks and
other structures shall be to 95% of the maximum moisture-density relationship,
as determined by ASTM Specification D698, Method D. Ice, snow or frozen
material shall not be used for backfill.
Added [8-17-1998 by L.L. No. 6-1998]
Pump stations installed as a part of new sewers
or sewer extensions shall conform to the following provisions:
A.
Pump stations shall be factory built, aboveground,
fiberglass reinforced automatic pumping stations. The stations shall
be factory assembled and factory tested. The principle items of equipment
shall include minimum of two self-priming or vacuum-primed, centrifugal
sewage pumps, valves, internal piping, motor and level controls, and
internal wiring.
B.
The pump equipment compartment shall be above grade
and shall effectively be separate and isolated from the wet well.
Wet well access shall be through a minimum twenty-four-inch diameter
opening. Pumps shall be a minimum of two identical nonclog pumps of
a self-priming type equal in construction and performance to the T-series
as manufactured by the Gorman Rupp Company or it's equal, anything
less will not be accepted, or vacuum primed type equal in construction
and performance to the Wet Well Mounted Pump Station model as manufactured
by Smith and Loveless, Inc., anything less will not be accepted. Pumps
shall utilize mechanical seals.
C.
Furnish the pump station with the following spare
parts: one spare mechanical seal (complete), and with it all gaskets,
seals, sleeves, O-rings and packing required to be replaced during
replacement of the seal and other parts recommended by manufacturer.
D.
The pump motors shall be standard horizontal NEMA
T frame, open-, drip-proof, induction type, with normal starting torque
and low starting current characteristics suitable for three phase,
sixty Hertz, AC electrical current to match voltage available from
electrical utility. Motors shall be cast iron frame with copper windings.
E.
The pump station enclosure shall be made of fiberglass
and fitted with access doors with locks and hatches which permit routine
maintenance without exposing equipment to inclement weather. The enclosure
shall be supplied with a ventilation blower capable of exchanging
the air in the enclosure once every two minutes. The enclosure shall
be heated by a 1300/1500-watt heater with thermostat. The pump station
shall be supplied with one 115-volt AC alarm light.
F.
Each pump shall be equipped with a flanged full flow-type
check valve and plug valve capable of passing a three inch spherical
solid.
G.
Each pump shall be equipped with a four-inch diameter
glycerin-filled compound suction gauge and a four inch glycerin-filled
pressure garage.
H.
Pump controls shall be equipped with components to
provide a complete operating system, including open frame, across-the-line,
NEMA rated magnetic motor starter; manual reset; overload relays;
a duplex ground fault indicating utility receptacle providing 115-volt,
60 Hertz, single-phase current; thermostat and switch to shut down
the pump motor when required to protect the pump from damage caused
by excessive temperature; HOA switches; alternator relay; pump run
indicators; elapsed time indicators; and sequence selector switch.
I.
The level controls shall operate the pump based on
wet well level and shall sequence the pumps and alarms. The level
control shall incorporate automatic pump alternation, independent
lag pump, high water alarm, and alarm silence.
J.
The pump manufacturer shall design and manufacture
the entire pumping system. The pumps, motors, piping, valves and controls
shall be totally factory assembled and be given an operational test
in accordance with the standards of the Hydraulic Institute. The test
shall substantiate the correct performance of the equipment at the
the design head, capacity, suction lift, speed and HP as specified.
