[Ord. 751, 4/21/1996, § 1]
1.
This Part sets forth uniform requirements for the acceptance and
ownership of sewers and appurtenances constructed by others.
2.
This Part defines certain terms and provides for the regulation of
the construction or repair of sewers and appurtenances by others,
by contract or agreement or any other means with the Borough. Except
as otherwise provided herein, the Borough Manager shall administer,
implement and enforce the provisions of this Part.
[Ord. 751, 4/21/1996, § II]
The short title of this Part shall be the "Borough of Elizabethtown
Sanitary Sewer Installation Specification Ordinance."
[Ord. 751, 4/21/1996, § A; as amended by Ord. 829,
11/15/2001]
1.
Rules and Regulations. In these rules and regulations, Borough shall
mean Elizabethtown Borough and contractor shall mean contractor, subcontractor,
owner or developer. Any sewers, pump stations, force mains and other
sewerage facilities constructed within Elizabethtown Borough shall
meet the requirements contained herein before the ownership of such
facilities is accepted by the Borough.
2.
Observance of Laws. The contractor at all times shall observe and
comply with all Federal and State laws and regulations, and local
bylaws, ordinances and regulations in any manner affecting the conduct
of the work, as well as all safety precautions and orders or decrees
which have been promulgated or enacted, or which may be promulgated
or enacted, by and legal bodies having authority or jurisdiction over
the work. Such observance and compliance shall be solely and without
qualification the responsibility of the contractor without reliance
on superintendence or direction by the Borough. The duty of enforcement
of all of said laws, ordinances, regulations, orders, or decrees lies
with the body or agency promulgating them, not with the Borough.
3.
Legal Documentation. After all construction and inspection requirements
are fulfilled and approved by the Borough, the contractor shall prepare
proper legal documentation to the satisfaction of the Borough in order
to formally transfer ownership of the sewerage facilities to the Borough.
General forms and guidelines for conveying the facilities to the Borough
are included in Appendix A.
4.
Warranty. The contractor shall provide a warranty for one year following
the date of acceptance of the facilities by the Borough. This warranty
shall include all equipment, materials or appurtenances installed.
It shall be the sole responsibility of the contractor to repair or
replace any equipment, materials or appurtenances deemed defective
by the Borough during that period. The warranty shall include restoration
and/or settlement of excavated areas either in public or private rights-of-way.
The contractor shall be solely responsible for refilling excavations
and restoring surfaces damaged due to settlement during that period.
In State highways, the warranty shall be extended to two years from
date of acceptance of the facilities by the Borough. In Borough roads,
the warranty shall be as required by the Borough.
5.
Plans and Specifications.
A.
Plans and specifications for all sewerage facilities shall be properly
prepared by either a registered professional engineer or professional
land surveyor as allowed by the Pennsylvania Department of Environmental
Protection (DEP), and approved by the Borough.
B.
Complete plans of all facilities must be prepared, including plan
and profile views on the same sheet, and shall be submitted to the
Borough for approval. The scale shall be one inch = 50 feet horizontally,
and one inch = 10 feet vertically for all sewers and force mains.
An overall plot plan reflecting the proposed sewer installation with
arrows indicating the direction of flow shall be included. The Borough
may require the contractor to extend a terminal sewer section to a
nearby public road. Unless written permission is obtained from the
Borough for an exception, all sewers will be installed in public rights-of-way.
Suitable scales shall be used for pump stations and appurtenances.
Sheet size shall be standard 22 inches by 36 inches or 24 inches by
36 inches. The Borough datum (U.S.G.S.) shall be used for all elevations.
All rights-of-way shall be shown on all drawings, and shall be properly
acquired and properly recorded in the name of the Borough prior to
acceptance of the sewer. The right-of-way agreement shall be in a
format approved by the Borough. All plans shall bear and signature
and seal of a registered professional engineer.
C.
Upon completion of the work and prior to acceptance by the Borough,
record plan mylar reproducibles shall be given to the Borough, and
these shall include the location, pipe type, length and depth of all
sewer lines, lateral sewers, and forcemains, record drawings for pumping
stations and all operating manuals. In addition, two complete sets
of legible prints of each mylar sheet shall be furnished by the Borough.
6.
Shop Drawings. The Borough reserves the right to require shop drawing
submission by the contractor for any and all items to be used in the
construction of the sewers or appurtenances. The contractor must obtain
approval of shop drawing items prior to use or installation.
7.
Permits. The contractor shall secure in the name of the Borough all
permits that are required in the name of the Borough such as those
from the Department of Environmental Protection, Conrail, and PennDOT.
Any existing street, highway, or other improvements disturbed during
construction shall be restored to the satisfaction of the Borough
before the facilities will be approved for final acceptance by the
Borough. All costs of such permits including any and all bonds required
shall be the sole expense of the contractor. All costs of inspections,
as may be required by permit issuing agencies, shall be the sole expense
of the contractor.
8.
Inspections. The work shall at all times be subject to inspection
and examination by the Borough's representative. The contractor shall
provide free access and reasonable facility for examination of the
work, including uncovering and testing thereof.
[Ord. 751, 4/21/1996, § B; as amended by Ord. 829,
11/15/2001]
1.
All designs shall conform to good engineering practice, meet the
requirements of DEP, OSHA and the Pennsylvania Department of Labor
and Industry, and shall conform to the requirements contained herein.
The minimum diameter shall be eight inches and the minimum slope for
all terminal sections of sewers shall be 1.0%. The minimum slope for
all other eight inch diameter sections shall be 0.50%.
2.
Sewers shall be designed on the basis that all units shall be served
by a four inch sewer lateral having a minimum cover of three feet
at any point along its entire length. All wyes shall be set in accordance
with the details noted on Plate 1 contained herein using four-inch
bends. The invert elevation of the four inch service lateral at the
30 bend shall be the same as the elevation of the crown of the main.
The use of PVC "T-wyes" will not be permitted.
3.
Under normal conditions, sewer lines with depths greater than 15
feet will not be approved. In each instance, these conditions should
be thoroughly evaluated and discussed with the Borough during the
design. In all cases were subsequent approval is given by the Borough,
trench load calculations shall be submitted to verify the type of
pipe and bedding conditions to be utilized. The calculations for PVC
pipe shall include a safety factor of 1.5.
[Ord. 751, 4/21/1996, § C; as amended by Ord. 829,
11/15/2001]
1.
Gravity Sewer Pipe Materials and Joints.
A.
Cement Lined Ductile Iron Pipe and Fittings.
(1)
Ductile iron pipe shall be in full accord with the standard
specification as set forth in the ANSI Specification A21.51 or A.W.W.A.
specification C151, Latest Edition, with wall thickness in full accord
with the standard specification as set forth in the ANSI Specification
A21.50 or A.W.W.A. Specification C150, Latest Edition.
(2)
Joints shall be of the push-on type or mechanical joint type
in full accordance with ANSI A21.11 or A.W.W.A. C111 specifications,
latest edition.
(4)
Minimum Thickness. The minimum pipe thickness shall be Class
52.
B.
Polyvinyl Chloride Sewer Pipe.
(1)
Materials. Polyvinyl Chloride (PVC) sewer pipe conform to ASTM
D-3034-SDR35.
(2)
Joints. The pipe and fittings shall be joined with an integral
bell-and-spigot type rubber gasketed joint. Each integral bell joint
shall consist of a formed bell with a single locked rubber gasket
as manufactured by J.M. Manufacturing Co. or approved equal. Gaskets
shall conform to ASTM D-3212.
2.
Pressure Sewer Pipe Materials and Joints.
A.
Ductile Iron Pipe.
(1)
Material.
(a)
Ductile iron pipe and fittings shall be Class 52 in full accordance
with the standard specification as set forth in the ANSI Specification
A21.S1 or A.W.W.A. Specification C151 latest edition, with wall thickness
in full accordance with the standard specification as set forth in
the ANSI Specification A21.50 or A.W.W.A. Specification C150, latest
edition.
(b)
All ductile iron pipe and fittings shall be coated inside and
outside with a bituminous based material at least one mil. thick.
In long force mains, the Borough may require a polylining of the pipe.
(2)
Joints. Pipe joints shall be of a type which employs a single
elongated grooved rubber gasket to effect the joint seal or mechanical
joints in full accordance with ANSI A21.11, or A.W.W.A. C111 specifications,
latest edition.
B.
Steel.
(1)
Material. Steel pressure sewer pipe shall conform to A.W.W.A.
Standard C-202. Interior lining shall be in accordance with A.W.W.A.
Standard C-203. All steel pipe and fittings shall be coated inside
and outside with a bituminous based material at least one mil, thick.
(2)
Joints. Joints shall be bell and spigot type with O-ring gasket,
or approved sleeve type couplings with rubber gaskets.
4.
Air Release Valves.
A.
The valves shall be designed for sewage service and shall be nonclogging
with cast iron body, bronze trim and stainless steel floats. Valves
shall be provided with shutoff valve, blow-off valve and quick disconnect
hose connection and backflushing hose and valve.
B.
Valves shall have a venting capacity of 270 C.F.F.A.M. at 50 psig
differential pressure and shall be similar to those manufactured by
APCO.
C.
Manhole shall be standard precast concrete construction in accordance
with ASTM C-478. Manhole base shall be provided with drain. Manhole
cover shall be adequately vented to insure discharge or intake of
free air as specified above.
5.
Precast Reinforced Concrete Manholes.
A.
Precast Reinforced Concrete Manhole Risers and Tops.
(1)
Precast reinforced concrete manhole risers and tops shall conform
to A.S.T.M. Specification C-478 (latest revision) and shall be of
watertight construction. Joints between manhole sections shall be
provided with performed plastic joint sealing material such as Rub-R-Nek
as manufactured by K. T. Snyder Co., MAS-STIK as manufactured by Concrete
Products Supply Co., or approved equal. The performed joint sealer
shall be protected by a removable two piece wrapper and shall be applied
in strict accordance with the manufacturer's recommendations. The
chemical composition of the sealer shall meet the following requirements:
the latest revision of Bitumen-A.S.T.M. D-4-77, Inert Ash Mineral
A.A.S.H.T.O. T-111-42, Volatile Matter A.S.T.M. D-6-67.
(2)
Manholes shall be constructed in accordance with the standard
details noted on Plate 1 contained herein. Shop drawings shall be
submitted for approval.
(3)
All manhole covers shall be set at same slope and crown as finished
road surface. If an extension is made from an existing manhole that
will be below finished grade, that manhole shall be raised to finished
grade at the expense of the contractor. If the existing Borough manhole
will be above the finished grade, the contractor shall adjust the
manhole to finished grade. If the proposed construction includes an
existing street or right-of-way in which the existing grade will be
changed, the contractor shall be responsible for adjusting all existing
manholes to finished grade. All adjustments required shall be in accordance
with methods approved by the Borough. Such approval must be obtained
in writing prior to construction.
(4)
Lift holes in manholes shall not extend through the entire width
of the wall.
(5)
Manhole bases may be cast-in-place concrete, and shall have
a compressive strength of not less than 3,000 psi after 28 days (tests
to be in accordance with A.S.T.M. Specification C-39, latest revision).
(6)
Precast manhole bases shall have flexible watertight joints
at the point of entry of any sewer pipe into the manhole. The rubber
materials shall conform to ASTM C443. The gaskets shall be cast into
the manhole base to become an integral part of the concrete. The gaskets
shall be Press Wedge II as manufactured by Press-Seal Gasket Corporation,
Dura-Seal III, or Dura-Seal PSX, as manufactured by Dura Tech Inc.,
and supplied by Monarch, Dallastown, PA, Dual Seal II as supplied
by Terre Hill concrete Products, "FLEX-LOK" as supplied by York Concrete,
York, PA or equal.
B.
Frame and Cover. Manhole frame and cover shall be of soft grey iron
equal in design to Number R-1656 manufactured by the Neenah Foundry
Company, Neenah, Wisconsin, machined and having the words "SANITARY
SEWER" cast approximately in the center of the cover. All frames on
manholes shall be securely attached to the manhole by use of anchor
bolts. The joint between the frame and the precast manhole section
shall be provided with preformed plastic joint sealing material equal
to Ram-Nek as manufactured by K. T. Snyder Company, Inc. of Houston,
Texas. It is required that this joint be watertight.
C.
Watertight Manhole Frame and Cover. Watertight manhole frames shall
be of soft grey iron similar in design to Number R-1755C as manufactured
by Neenah Foundry Co., Neenah, Wisconsin, and having the word "SANITARY
SEWER" cast approximately in the center of the cover. Watertight frames
shall be securely attached to the manhole by use of anchor bolts.
The joint between the frame and the precast manhole section shall
be provided with performed plastic joint sealing material equal to
Ram-Nek as manufactured by K. T. Snyder Company, Inc. of Houston,
Texas. It is required that this joint be watertight.
D.
Manhole Steps.
(1)
Manhole steps shall be 3/4 inch diameter aluminum alloy 6061-T6,
similar in design to R-1982-W as manufactured by the Neenah Foundry
Co., Neenah, Wisconsin. Manhole steps shall be grouted in place using
a nonshrink, nonmetallic grout, cast in place or driven into polypropylene
inserts or manhole steps made of steel reinforced copolymer polypropylene
similar in design to PS2-PF or PS2-PFS as manufactured by M. A. Industries
Inc., Peachtree City, GA.
(2)
The Borough reserves the right to have steps tested according
to the latest revision of ASTM Specification C-478 at the contractor's
cost.
(3)
Manhole steps shall be positioned in the manhole in such a manner
to permit easy access to the manhole and not conflict with either
influent or effluent lines. The first step shall be no further than
24 inches from the top of the manhole.
6.
Pumping
Stations.
A.
General.
(1)
Sewage pump stations which are intended to be transferred to
the Borough shall be properly designed to conform to all applicable
regulations of the Pennsylvania Department of Environmental Protection
(DEP), OSHA, and the Pennsylvania Department of Labor and Industry.
Prior to approval by the Borough, detailed construction drawings and
specifications, as well as the design calculation, must be submitted.
(2)
Both wetwell/drywell, and submersible type stations will be
considered. These requirements pertain to pumping stations which will
serve multiple dwellings and/or industrial or other developments which
discharge sewage by gravity to the pump station site. They do not
apply to individual effluent or sewage pumps in low-pressure systems.
(3)
The contractor shall obtain DEP approval and permits in the
name of the Borough.
(4)
Special consideration must be given to the fact that wet wells,
other than those on residential properties, are considered hazardous
Class 1, Group D environment.
(a)
Safety Requirements. All gears, chains, coupling, projecting
set screws, keys and similar rotating or reciprocating parts shall
be protected in accordance with American Standards Association Safety
Code for Mechanical Power-Transmission Apparatus 815-1927.
(b)
Drawings and Details. The contractor shall furnish the Borough
detailed plans and instructions for installation and operation of
the pumps, detailed drawings showing the piping arrangement required,
and two copies of characteristic performance curves for each proposed
pump. The drawings will be examined only for general design, general
dimensions and apparent suitability and will be approved or returned
for the changes required. Such approval will not relieve the contractor
of the responsibility for furnishing equipment which will satisfactorily
perform under the conditions specified.
(c)
Description of Equipment. The contractor shall furnish a complete
description of all equipment offered under this specification, including
manufacturer's information and pertinent curves based on laboratory
tests of existing similar pumps. The curves shall show the capacity,
head, efficiency and brake horsepower throughout the head and capacity
range.
(d)
Spare Parts and Tools.
1)
The contractor shall furnish one complete set of tools that
are necessary for the maintenance and repair of the pumps. One pressure
grease gun for each type of grease required for pumps and motors shall
be furnished.
2)
Spare parts shall consist of one extra set of pump bearings,
two sets packing, or mechanical seals for each pump station and one
extra shaft sleeve for each size pump.
(e)
Site and Access Road.
1)
The pump station site shall be properly graded to eliminate
any stormwater problems and/or ponding conditions. After grading,
the site shall be seeded and landscaped. Provisions shall be made
to include shrubbery in the landscaping to enhance the appearance
of the station. The contractor is responsible for obtaining a good
stand of grass until the time of first cutting. The site shall be
fenced and shall be of sufficient size to accommodate the pumping
facilities and to permit the turnaround of service vehicles. The access
road and turnaround shall have a paved surface. The minimum width
of the paved surface of the access road shall be 12 feet.
2)
Specifications. Form, shape and compact subgrade. Six inches
compacted stone base course. One and a half inch BCBC base course
and one inch BCBC wearing course. Toe drains and stormwater culverts
as dictated by topography.
3)
The site shall be provided with overhead exterior lighting.
4)
The site shall be fenced with vinyl coated link Fence six feet
high with sliding/rolling link fence gate and man gate. Locking devices
must be provided on both gates.
(f)
Emergency Generator Building. An emergency generator shall be
mounted permanently in a building with all appropriate electrical
controls (including automatic "switch-over" controls). This building
shall also house pump control panel specified elsewhere. The building
shall conform aesthetically with adjoining residential units. Construction
details of the building shall be subject to approval of the Borough.
Temporary or flimsy housing or structures will not be accepted, nor
will metal or fiberglass enclosed generators.
B.
Station Construction.
(1)
Wetwell/Drywell Type.
(a)
General.
1)
The wetwell must be capable of being isolated by means of a
gate valve located upstream of the wetwell.
2)
The station shall consist of two prefabricated sections assembled
in the field. The entrance tube shall be a minimum 42 inches I.D.
The pump chambers shall be of 1/4 inch structural plate and the top
and bottom heads 3/8 inch structural plate. Reinforcing eight inch
I-beams shall be welded to the bottom head. Top head shall be reinforced
with either eight inch I-beams or channels. Lifting lugs shall be
provided of sufficient capacity to carry the entire weight of the
complete chamber. Pump chamber dimensions shall be eight feet inside
diameter and eight feet in height.
3)
All welds shall be continuous and watertight. Lugs shall be
properly positioned and welded to the ceiling to lift each pump and
motor.
4)
The entrance tubes shall be 1/4 inch structural steel plate,
rolled and seam welded and reinforced at the top and bottom with rolled
angles. Entrance tubes shall extend above grade a minimum of 18 inches.
The lid shall be raintight and fitted with a handle and positive automatic
latching device and have a lock that can be opened with a knob from
the inside and a key from the outside. Two steel vent pipes shall
be attached to the outside of the entrance tube to provide a fresh
air intake and exhaust vent. Pipes shall be screened and have a rain-proof
opening.
5)
Two magnesium anodes shall be furnished with insulated wire
to be attached to each station and placed in the backfill to provide
cathodic protection.
6)
The entrance tubes shall be provided with intermediate landings
in accordance with DEP standards.
(b)
Pumping Facilities.
1)
A minimum of two pumps shall be provided and installed. Pumps
shall be of the nonclog type capable of passing a sphere with a minimum
diameter of three inches. Pump casing shall have built-in suction
elbow. Each pump shall be close coupled and shall have two sets of
ball bearings designed for both radial and vertical thrust.
2)
The pump shaft shall be sealed by a standard packed stuffing
box. Stuffing box shall have minimum of five rings of graphite impregnated
square packing with cast iron gland seal. The seal shall be lubricated
by:
a)
Water taken directly from the public water supply, if available,
to a lantern ring inside the seal housing; or,
b)
Water taken from the pump volute through a filter to a lantern
ring inside the seal housing. Filter shall be of corrosion resistant
materials and shall screen out solids larger than 50 microns.
3)
The use of mechanical seals shall also be considered.
4)
A manually operated brass valve shall be provided to vent the
pump volute.
(c)
Motors.
1)
The pump motors shall be specially built NEMA P base, open drip-proof
induction type, suitable for three phase, 60 Hz, 230/460 volt electrical
service. The motors shall have a service factor of 1.15. They shall
have normal starting torque and low starting current, as specified
for NEMA Design B characteristics. The motors shall not be overloaded
at the design condition, nor at any head in the specified operating
range.
2)
Motors shall have Class F insulation, Class B temperature rise,
40°C ambient. Insulation shall be of non-hygroscopic materials
which resist moisture and are fungus resistant.
3)
Each motor shall have oversized, grease-lubricated ball bearings
with the thrust bearing at the bottom locked in position to eliminate
shaft end-play. The motor shaft shall be solid stainless steel.
4)
The motor-pump shaft shall be centered, in relation to the motor
base, within 0.005 inches. The shaft run-out shall be limited to 0.003
inches.
5)
The motor shall be fitted with heavy lifting eyes, each capable
of supporting the entire weight of the pump and motor.
6)
A special varnish treatment shall be applied to the stator windings
and rust preventative compounds shall be used to coat the rotor and
stator air gap surfaces and protect the motor against corrosion.
(d)
Controls. The control equipment shall be as for submersible
type stations. (See § 113(6)(A)(2) et seq.)
(e)
Dehumidifier. The contractor shall install an automatic refrigeration
type dehumidifier to maintain the relative humidity of the air in
the pump chamber as low as possible. The dehumidifier shall be capable
of removing three gallons of moisture per 24 hours, and shall be automatically
controlled by an adjustable cold coil thermostat and a panel mounted
humidistat. The condensation shall drain to the sump.
(f)
Sump Pump. The contractor shall install in each pump station
a submersible sump pump with 1/3 HP motor mounted directly above the
impeller. The volute casting shall have feet to support the impeller
entrance the proper distance above the bottom of the pump. It shall
have a minimum capacity of 1000 GPH at 20 feet TDH. The pump shall
be controlled by a level control switch, capable of operation on a
two inch differential water level. It shall discharge back into the
wet well through a 1 1/4 inch pipe with two check valves and
a gate valve within the pump chamber.
(g)
Ventilating Blowers. A ventilating blower capable of displacing
30 air changes per hour should be installed in the pump chamber and
the wet well. The blower and lights shall be turned on by a NEMA one
entrance switch at the entrance to the pump chamber or wet well respectively.
The pump chamber blower shall also be timer controlled. No piping
from the wet well may enter the pump chamber.
(h)
Wiring.
1)
The pump station shall be completely wired at the factory, except
for the power feeder lines, and shall be in accordance with the National
Electric Code. All wiring in the pump station shall be color coded
as indicated on the wiring diagram. Minimum wire size shall be #12
AWG copper. All wiring outside the panel shall be in rigid galvanized
steel conduit, 3/4 inch minimum, except for 115 volt accessory items
which are provided with connecting insulated service cord by the manufacturer.
The manufacturer shall furnish and install conduit from the control
panel across the ceiling, and up the entrance tube to receive the
feeder lines. The conduit shall terminate in a threaded conduit connection
through the wall of the entrance tube above ground level.
2)
Accessory items such as the sump pump, dehumidifier, and air
compressors shall be plugged into polarized, grounded convenience
outlets, located close to their installed position so that such items
can be readily removed and serviced if necessary.
(i)
Heater. A 750 watt, 120 volt, electric heater shall be installed
in the station. The heater shall be thermostatically controlled. The
heater shall not be placed within two feet of the control panel.
(j)
Station Painting.
1)
After welding, all inside and outside surfaces of the structure
shall be blasted with steel grit to remove rust, mill scale, weld
slag, etc. All weld spatter and surface roughness shall be removed
by grinding. Immediately following cleaning, a single heavy inert
coating shall be factory applied to all inside and outside surfaces
prior to shipment. This coating shall be of "Versapox" epoxy resin,
or equal, especially formulated for abrasion and corrosion resistance.
The dry coating shall contain a minimum of 85% epoxy resin with the
balance being pigments and thixotropic agents.
2)
A touch-up kit shall be provided for repair of any mars or scratches
occurring during installation. This kit shall contain detailed instructions
for use and shall be a material which is compatible with the original
coating. The touchup coating shall contain a minimum of 85% epoxy
resin.
3)
All motors, pumps, bases, brackets, ladders, piping and steel
support shall be properly primed and painted with two coats of rust
inhibitor paint in strict accordance with the manufacturer's recommendations.
(2)
Submersible Type.
(a)
General. A minimum of two pumps must be provided and installed.
The station, including pump and valve chambers, manholes, meter pits
and other structures constructed below grade shall be watertight and
must meet current ASTM Specifications. A separate valve chamber must
be provided in accordance with DEP requirements.
(b)
Sump Basin and Cover.
1)
The sump basin shall be of reinforced concrete and shall be
provided with a hinged aluminum cover of non-skid pattern. The basin
shall be large enough to comfortably accommodate the pumps. The cover
shall have angle frame with rectangular opening of sufficient size
to permit easy removal of the pumps. Cover shall have a hold-open
bar that can be locked in open position, and shall have a lock that
uses a key or special insert to open. All hardware shall be of noncorrosive
material.
2)
Basin shall be provided with an extendable aluminum access ladder
with rungs at 12 inch oc. Extendable section must consist of two vertical
handrails projecting a minimum of three feet above top of basin.
(c)
Valve Chamber.
1)
A separate valve chamber shall be provided on the discharge
side of the sump basin. The valve chamber shall accommodate a check
valve and gate valve for each pump, and shall be large enough to comfortable
accommodate the valves and fittings.
2)
A NEMA four limit switch shall be provided on each check valve
to signal open/close operation. The switches shall have N.O./N.C.
contacts rated 120 volts, 10 amps. These switches shall be connected
into the pump fail circuitry.
3)
The valve chamber shall be provided with an aluminum hatch cover a described in subsection (2), above.
4)
Chamber shall be minimum four feet six inches deep with aluminum
access ladder with rungs at 12 inches oc. A three inch diameter drain
shall be provided from the floor of the chamber to the pump sump.
The floor shall be sloped towards the drain. The drain shall have
a check valve to prevent backflow from pump sump in case of high water
level in the pump sump.
(d)
Lift-Out Rail System. Station shall be provided with a rail
system to facilitate easy removal of the pumps. Rails shall be firmly
fixed with rail supports to the wall of the sump basin. Rails, supports
and all hardware shall be made of noncorrosive materials.
(e)
Submersible Pumps.
1)
Casings. Pump casing and motor casing of ASTM-A48 cast iron.
Pump casing of the single volute type, ribbed to prevent excessive
deflection and hydrostatically tested to twice the design head or
1 1/2 times the shutoff head whichever is greater. Volute sized
at all points to pass solids which can pass through the impeller and
internally finished to provide smooth, unobstructed flow.
2)
Impeller. Nonclogging type of ASTM-A48 cast iron, statically,
dynamically and hydraulically balanced, capable of passing three inch
solids. Key seat the impeller and secure it to the shaft by a hex
head impeller nut.
3)
Pump Shaft. Stainless steel of sufficient strength and size
to safely transmit the maximum torque developed by the drive unit.
Shaft sized to provide rigid support of the impeller and prevent excessive
vibration.
4)
Pump Shaft Bearings Ball or roller type, oil lubricated. Upper
bearings to support full dead load and hydraulic thrust. Design bearings
with a 20,000 hour B10 minimum bearing life per AFBMA test procedure.
5)
Shaft Seals. Provide each pumping unit with a double mechanical
seal, running in an oil filled reservoir, composed of two separate
lapped faced seals, each consisting of one stationary and one rotating
tungsten carbide ring each held in contact by a separate spring, so
that the outside pressure assists spring compression in preventing
the seal faces from opening.
a)
Protect the compression spring against exposure to the pumped
liquid. Seal the pumped liquid from the oil reservoir by one face
seal and the oil reservoir from the motor chamber by the other.
b)
Equip each pumping unit with a liquid sensing device to prevent
damage to the motor in the event of a shaft seal failure.
6)
Pump Motor. Provide a motor having Class F insulated windings
(which are moisture resistant) housed in a watertight casing. The
motor shall have cooling characteristics suitable to permit continuous
operation in a totally, partially or nonsubmerged condition. Motors
shall be rated Class one, Group D hazardous.
7)
Pump Accessories. Provide the following accessories with each
pumping unit.
a)
Stainless steel chain of adequate strength and length to permit
raising of the pumping unit for inspection and removal. Chain must
have large secondary links attached at minimum 10 foot intervals.
b)
Guide rails.
c)
Upper guide rail brackets.
d)
Pump motoring plate with discharge elbow and lower guide rail
support brackets.
e)
Power cable of adequate length.
(f)
Controls.
1)
Mercury Float Switch Controller. Provide a control system consisting
of mercury float switch and other necessary appurtenances. Switches
to be molded into an epoxy filled polypropylene float. Provide two
spare floats with cables to the Borough.
2)
Pump Controls.
a)
One circuit breaker disconnect unit per pump with magnetic trip
sized for individual pump protection. This unit shall provide the
maximum electrical motor protection available, serving as a circuit
breaker and manual disconnect switch.
b)
One across-the-line starter per pump, sized in accordance with
NEMA horsepower standards.
c)
1 N.O. auxiliary contact for run status and 1 N.C. auxiliary
contact for stop status, overload relay, and all other controls and
accessories necessary for proper operation and protection.
d)
Low voltage (24 VAC) level sensing circuitry for intrinsically
safe relaying.
e)
Solid state alternator for duplex controls.
f)
Individual toggle type selector switches to provide "AUTO-OFF-HAND"
control of each pump.
g)
Twenty-four volt AC control transformer, protected by circuit
breakers or fuses on both the primary and secondary.
h)
Terminals shall be provided for connection of the level sensors.
i)
A removable dead-front panel shall be provided to protect the
operator.
j)
All operator's controls, toggle switches, circuit breakers,
etc., shall be accessible without removing the dead-front panel.
k)
NEMA one enclosure with latch mechanism.
l)
Duplex three phase 240 or 480 volt power supply as dictated
by the power company and motor requirements.
m)
A relay which automatically reconnects the control circuit to
pump number two if pump number one circuit breaker trips.
n)
High level and low level alarm relays with unpowered contacts
and terminals shall be included.
o)
Pump running transformer type pilot lights (red) mounted on
operator's control panel. Pump stopped pilot lights (green) mounted
on operator's control panel.
p)
Nonresettable running time meters mounted on operator's control
panel.
q)
Seal leak detector for each pump with unpowered relay contacts
for alarming.
r)
Three phase power monitor with adjustable settings, stops pump
for low voltage, single phasing and phase reversal.
s)
One pump to be locked off during generator operation with ability
to switch to other pump should selected pump fail.
t)
A "HAND-OFF-AUTO" selector switch provided for each of the two
pumps controlled with the following operation:
i)
Hand Position. In this position, the pump controlled
by the switch will run regardless of the wet well level. The pump
will continue to run until the switch is turned to "OFF" or "AUTO".
ii)
Auto Position. In this position, the operation
of the pumps is controlled automatically by the level sensors in the
wet well as follows:
|
a.
|
The control circuit is placed in standby when the liquid level
rises to tilt the lowest sensor which is a redundant cutoff and low
water alarm.
| |
|
b.
|
As the level continues to rise, the control circuit is energized
when the pump off level sensor rises.
| |
|
c.
|
As the level continues to rise and the next level sensor is
tilted, the first (lead) pump will start. In this step, the pumps
will alternate on successive cycles. If pump number one starts first
on one cycle, pump number two will start first on the next cycle.
This insures equal operating time and wear on each pump.
| |
|
d.
|
As the level in the well is pumped down, the pump or pumps will
continue to operate until the level drops just below the pumps off
level sensor.
| |
|
e.
|
If the level in the well continues to rise with one pump in
operation, the second pump will be turned on when the level reaches
lag pump on/high water level float.
| |
|
f.
|
If the water continues to rise, the high water alarm level sensor
will activate an alarm.
|
C.
Pipes and Fittings.
(1)
Suction and discharge piping shall be Class 52 (Min) Ductile
Iron (Cement Lined): ANSI A21.50 and ANSI A21.51. Fittings shall be
Gray Iron or Ductile Iron: ANSI A21.10, up to 12 inches inclusive
250 psi rated.
(2)
Flanged joints shall be used inside structures.
(3)
Pipes and Fittings to be factory coated inside and out with
bituminous material; minimum one mil dry thickness.
D.
Valves.
(1)
(2)
Check Valves.
(a)
Designed for a minimum working water pressure of 150 psi.
(b)
Iron body, bronze mounted, full opening swing check type with
bolted cover, stainless steel hinge and malleable iron clapper arm.
(c)
Disc of cast iron with bronze seat ring.
(d)
Valves less than 10 inches and larger furnished with outside
lever and spring.
(e)
Valves less than 10 inches furnished with outside lever and
weight.
E.
Alarm System. An alarm system capable of monitoring the following
functions and transmitting the relevant signal to the designated location,
shall be installed:
(3)
Acceptable Manufacturers. The dialer shall be a real voice type
with eight-channel capacity. Dialer shall be Verbatim by RACO or MCS500
by Microtel.
(4)
Provide a wall mounted pushbutton telephone and RJ11 jack. Acceptable
Manufacturer: Bell, AT&T, G.E., or approved equal. Contractor
shall make all arrangements with telephone company and pay all relevant
installation charges and fees.
F.
Flow Metering.
[Amended by Ord. 966, 12/18/2014]
(1)
A flow metering device must be provided capable of continuously
recording pumped flows. If meter is used with a wet well/dry well
type station, the meter shall be installed inside the dry well area.
If the meter is used with a submersible type station it shall be installed
in a manhole of sufficient size as to permit easy access for maintenance.
(2)
Acceptable Product: Toshiba Mount Anywhere flow meter or equal.
G.
Water Supply. Where public water supply is available, a 3/4 inch
diameter metered water service terminating at a frostproof yard hydrant,
in the case of submersible type station, and terminating inside the
drywell in the case of wetwell/drywell station, must be provided.
Service to include all fees and charges for the provision thereof.
H.
Tests. Field tests shall be carried out at the expense of the contractor
to ensure that pumps and all equipment meet the design criteria. The
Borough's personnel will witness the field tests.
I.
Emergency Power.
(1)
The contractor shall install a diesel or propane powered emergency
generator set and automatic transfer switch required to run the pumps
and all equipment within the station upon loss of normal power.
(2)
The system components shall be new equipment of current design,
not one-of-a-kind, and consist of an approved engine-driven electric
plant with mounted start-stop controls, an automatic load transfer
control, and all necessary accessories. All components shall be completely
built, tested and shipped by a manufacturer who has been regularly
engaged in the production of such equipment for the past 10 years
and who has local parts and service facilities, so there is one responsibility
for the proper functioning of the entire system. The plant shall be
as manufactured by Kohler, Caterpillar, Onan or approved equal.
(3)
The plant shall be mounted on a welded steel skid base, which
in turn shall mount on six-inch high I-beams securely mounted to the
frame and a concrete pad. The pad shall be sloped to prevent standing
water to accumulate under the generator set. The starting batteries
shall be placed on a cast iron rack on the inside of the housing.
The muffler shall be attached to the exhaust line by 125 pound American
standard pipe flanges. The exhaust line shall contain a condensate
trap with drain cock, at the first point of rise in the line from
the engine. Only long radius elbows shall be used in the exhaust line.
All required anchor bolts shall be furnished and installed. A stainless
steel flexible pipe shall connect engine to the exhaust system.
(4)
Exhaust air ductwork between radiator and exhaust louver, shall
be 20-gauge galvanized sheet steel. Engine radiator shall have a flexible
duct adapter.
(5)
A thermostatically controlled jacket water heater shall be provided
to maintain a jacket water temperature of 90° F. This unit shall
be as manufactured by Chromalox, Singer, or approved equal.
(6)
Provide a line circuit breaker with the generator. Breaker shall
be rated to handle the generated fault currents and shall be one of
those listed by the transfer switch manufacturer as providing withstand
and closing ratings listed. Breaker shall have the required number
of poles and current rating capable of handling required load.
(7)
Provide generator control panel with the following: voltmeter,
ammeter, selector switch, start controls, voltage level adjustment
rheostat, oil pressure gauge, fault indicators for safety shutdown,
"AUTO/MANUAL" switch, water temperature gauge, battery charge rate
ammeter, field circuit breaker, running time meter, panel face illumination
from the battery, generator failure output contacts.
(8)
Provide base mounted diesel fuel/gas tank of sufficient capacity
to sustain a minimum of 24 hours running at full tank of fuel/gas.
(9)
A current limiting battery charger shall be furnished to automatically
recharge the starting batteries. Charger shall float at 2.17 volts
per cell and equalize at 2.33 volts per cell. It shall include overload
protection, silicon diode full wave rectifiers, voltage surge suppressors,
DC ammeter, and fused AC input. AC input voltages shall be 120 volts.
Amperage output shall be no less than five amperes. Charger shall
be LaMarche Manufacturing Company, Model A-5, ESB Inc., or approved
equal.
J.
Transfer Switch.
(1)
The automatic transfer switch shall be fully rated, to protect
all types of loads, inductive and resistive, from loss of continuity
of power. The switch shall afford complete protection. The switch
shall be rated as suitable for all classes of loads without derating,
either open or enclosed.
(2)
The transfer switch shall automatically transfer its load circuit
to an emergency or alternate power supply from failure of its normal
or original supply. Upon restoration of the normal supply, the transfer
switch shall automatically retransfer its load circuits to the normal
supply.
(3)
All pilot devices/relays shall be of the industrial type rated
10 amperes with self-cleaning contacts.
(4)
Transfer mechanism shall be energized only momentarily during
transfer.
(5)
Components of the operating mechanism shall be insulated or
electrically dead.
(6)
All electrical equipment or apparatus of any one system must
be the product of one manufacturer or equivalent products of a number
of manufacturers which are suitable for use in a unified system. No
circuit breaker types are acceptable nor parts thereof.
(7)
For complete protection, close differential voltage sensing
relays shall be provided to monitor each phase of the normal supply.
A drop in voltage in any phase below the predetermined dropout value
of the relay shall initiate load transfer. The relay shall initiate
retransfer of the load to the normal supply as soon as the voltage
is restored in all phases beyond the predetermined pickup value of
the relay.
(8)
The transfer switch shall obtain its operating current from
the sources to which the load is being transferred.
(9)
The automatic transfer switch shall also be furnished with the
following options: adjustable two to 120 seconds time delay on normal
to emergency; adjustable zero to 15 second time delay on engine starting;
adjustable 12 seconds to 30 minutes time delay on emergency to normal;
adjustable zero to 30 minutes, set at five minutes time delay for
engine cool off; frequency/voltage relay for emergency source; test
switch in cover of switch; normal supply pilot lights, emergency supply
pilot light; engine start-stop contacts; relay auxiliary contacts
on normal and emergency source, 1 N.O. and 1 N.C.; solid neutral bar
assembly; plant exerciser for automatic test operation of plant with
transfer of load for pre-selected intervals (adjustable 0-168 hours
in multiples of 15 minutes) at least once a week.
(10)
All accessories and equipment shall be front accessible for
ease of maintenance or removal.
(11)
Transfer switches and options shall be as manufactured by ASCO
940, Kohler, Onan or approved equal.
K.
Lighting.
(1)
The contractor shall furnish all luminaries, lighting equipment
and components shown on the drawings, listed in the fixture schedule,
and specified herein. He shall furnish all labor and materials required
to install specified equipment in a workmanlike manner.
(2)
The contractor shall furnish and install lamps and accessories
as required. Prior to acceptance of building by the Borough, all fixtures
shall be cleaned, free of dust, insects and all foreign matter.
(3)
The light fixture schedule is listed below.
L.
Electric Unit Heaters.
(1)
Horizontal forced air unit heaters shall be rated for the building
size. Mounting brackets designed for either ceiling or wall swivel
mounting shall be furnished for each heater. The cabinet shall be
of 18 gauge dieformed furniture grade steel. Individual adjustable
louvers shall be furnished to provide desired control of discharge
air. All metal surfaces of the casing shall be phosphate coated to
resist corrosion, with a baked enamel finish.
(2)
Automatic reset thermal over-heat protection shall be provided.
(3)
Motors shall be of the totally enclosed continuous fan-duty
sleeve bearing type equipped with built-in thermal overload protection.
(4)
Fans shall be aluminum, directly connected to fan motor, dynamically
balanced and designed specifically for unit heater application.
(5)
Heaters shall be equipped with built-in comfort control thermostats
and necessary control transformers and contractors. Heaters shall
be equipped with cord and twist lock plug for connection to receptacle
and shall be Chromalox Type MUH, Singer, Berko or approved equal.
M.
Metal Louvers.
(1)
The contractor shall furnish all metal louvers (both the gravity
and motor operated type) required for installation in the generator
building. He shall provide the metal louvers complete with all motors,
controls, screens, trim and closure pieces required for a complete
installation. It shall be the responsibility of the contractor to
check all opening sizes and completely coordinate the installation
to insure a neat workmanlike job.
(2)
A gravity louver shall be furnished for installation on the
generator discharge. This shall be a fully automatic louver with the
exhaust blades normally in a closed position and set to open when
air pressure is applied. The blades shall move independently of each
other, smoothly and without flutter.
(3)
The head, sill, jambs and blades shall be extruded aluminum
section, 6063-T52 alloy with reinforced bosses. The exhaust blades
shall be cushioned the full length by vinyl gaskets. The heads, sills
and jambs shall be one piece structural members with integral caulking
strips and retaining beads. All fasteners to be stainless steel or
aluminum. All louvers shall be provided with #2 mesh 0.063 inch diameter
wire bird screen secured by an extruded aluminum frame on the louver
exterior which can be easily removed for cleaning.
(4)
The louvers shall be free of scratches and blemishes and provided
in a fluorocarbon polymer finish in a color to be selected by the
Borough.
(5)
The gravity louver shall be Model ASA/FBE as manufactured by
Penn Ventilator Airstream, Airolite Co., or approved equal.
(6)
A motor operated louver shall be furnished for use as the generator
air intake. This shall be a fully automatic louver with the operating
blades normally in a spring closed position and opened by a motorized
operator. The blades shall operate in a smooth continuous motion.
(7)
The head, sill, jambs and blades shall be extruded aluminum
sections, 6063-T52 alloy with reinforced bosses. The operating blades
shall be double gasketed with a vinyl material. The heads, sills and
a jambs shall be one piece structural members with integral caulking
slot and retaining beads. All fasteners shall be stainless steel or
aluminum.
(8)
The operating blades shall be operated by electrically controlled
motor operator. The motor shall be totally enclosed and suitable for
operation on 120 volt, 60 Hz, single phase service. The unit shall
be furnished with all controls and miscellaneous accessories for a
complete working installation.
(9)
The motor operated louver shall be Model ASA/FBI as manufactured
by Penn Ventilator Airstream, Airolite or approved equal.
(10)
The louvers are to be sized to suite the generator air requirements.
The exhaust louver shall be sized so that the maximum pressure drop
shall not exceed 1/2 inch of water when the generator is operating
at full speed. The intake louver shall be sized 25% larger than the
exhaust louver.
(11)
The motor operated intake louver shall be wired for both manual
and automatic operation. A selector switch shall be provided for manual
open-close operation.
(12)
The intake louver shall automatically open when the emergency
generator starts, and shall remain open until the generator shuts
down. All necessary controls, relays and wiring necessary for a complete
working installation shall be furnished and installed.
(13)
A thermostat shall also be provided to automatically open the
intake louver on excessive heat build-up within the generator building.
Thermostat shall have control range of 70° to 140° F., with
a 2° F. differential, and shall be Model T631C, as manufactured
by Honeywell, Chromalox or approved equal.
(14)
A limit switch shall be installed at the intake louver location,
and shall be positioned so that the switch is operated by the opening
of the louver blades. If the louver, and switch, does not open after
a preset time, a relay shall signal a "louver failure" condition to
the telemetering alarm system. Limit switches shall be as manufactured
by Westinghouse Type RR, Square D or approved equal.
N.
Electrical Construction.
(1)
The contractor shall meet with the electric company (PP&L)
and the local telephone company (UTS) to determine all requirements
at the site for service and metering. Any excess charges by the utilities
for furnishing the required service shall be the responsibility of
the contractor.
(2)
The contractor shall furnish and install a service pole at each
pumping station if the service is overhead. Service conductors and
raceways shall be installed from the generator building underground
to the service pole, and up pole terminating in an approved entrance
fitting. The power company will furnish and install an overhead service
drop to the pole and connect to service conductors. Poles shall be
guyed if required to offset pull of power company's service drop.
(3)
If the service is underground, the contractor shall furnish
and install underground conduit, current transformer cabinet, and
meter base. Current transformer cabinet or self-contained meter base,
as necessary, shall be mounted on the generator building. The utility
companies will furnish and install and service lateral.
(4)
A grounding grid shall be provided at the service pole. Metal
raceways, metal enclosures of electrical devices, transformer frames,
neutral conductor and other equipment shall be completely grounded
in accordance with the National Electrical Code. All necessary conduit,
conductors, clamps, connectors, etc. for the grounding system shall
be furnished and installed by the contractor.
(5)
Provide a main service entrance approved disconnect switch with
current limiting fuses as required. Heavy duty type, NEMA 1 enclosure
indoors, NEMA 3R enclosure outdoors with padlock attachment; Square
D, Cutler-Hammer, G.E. or equal.
(6)
The panel board shall be rated for the voltage present, dead-front
type, lockable with thermal-magnetic bolt-on circuit breakers, neutral
and ground bus, typed circuit directory.
(7)
Lightning protection shall be provided on the feeders immediately
on the load side of the main disconnect witch, grounding lead as short
as possible to grounding system, Innovative Technology, Inc. "P-Plus"
series, or equal as manufactured by Liebert, Current Technologies
or Transducer; A plug-in protector shall be used which has receptacles
and RJ-11 jack for the telephone/dialer connections, Innovative Technology,
Inc., Model PIU, or equal as manufactured by Liebert, Current Technologies
or Transducer.
(8)
Light switches to be 20 amp, 120/277 volt rated, P&S Series
20AC or approved equal; if weatherproof use P&S WP-1 level handle
weather-sealing cover with FS box.
(9)
Receptacles shall be 20 amp rated, 120 volt, two-pole, grounding
duplex, P&S 5362 or approved equal; ground fault type to be P&S
2091-F; if weatherproof use FS box with set location cover; power
outlet receptacle rated as shown on the drawing and as required, heavy-duty,
twist-lock, P&S series or approved equal.
(10)
Underground conduit shall be polyvinyl chloride schedule 40
as manufactured by Carlon, Sedco or approved equal. All bends in duct
lines of 40° and greater shall be manufactured steel elbows of
the same size as the PVC ducts. Ducts shall be encased in four inches
of concrete. Where conduits pass under roadways, parking lots or on
filled ground, a mat shall be provided in concrete, consisting of
two longitudinal #4 bars with #3 ties, one foot on center. Trenches
shall be backfilled with clean dirt, thoroughly compacted.
(11)
All conduit shall be rigid galvanized steel or intermediate
type, conforming to Federal Specifications WW-C-581E and be U.L. listed
and manufactured by Triangle Conduit & Cable Company, National,
Allied Tube & Conduit or approved equal.
(12)
Fittings for IMC conduit shall conform to Federal Specifications
W-F-408 and shall be threaded type.
(13)
Install sealing fittings, Crouse-Hinds type EYS and EZS, Appleton
type EYS or ESU or approved equal, wherever a conduit passes into
a hazardous area or extends between areas having widely different
temperatures.
(14)
Wires and cables shall be medium hard drawn copper of the size
as shown on the drawings, or #12 minimum if unspecified. For 600 volt
service and under, wire shall have Type THHN-THWN insulation. Wire
size of #10 and larger shall be stranded. All wiring shall be color
coded in accordance with current NEC requirements.
(15)
For wire size #10 and smaller, a solderless type press connector
similar to "Buchanan" shall be used with snap-on type nylon insulator;
splices of larger sizes of wire shall be made using an indentor type
coupling applied with a hydraulic pressure tool.
(16)
All materials and workmanship shall meet the minimum requirements
of the following standards where applicable:
(a)
National Electrical Code — National Fire Protection Association,
60 Batterymarch Street, Boston, Massachusetts (N.E.C.)
(b)
National Electrical Manufacturers Association, 155 East 44th
Street, New York, New York — Standards (NEMA)
(c)
Institute of Electrical and Electronic Engineers, 33 West 39th
Street, New York, New York — Standards (IEEE)
(d)
The U.S.A. Standards Institute, 29 West 39th Street, New York,
New York — Standards and Definitions of Electrical Terms (U.S.A.S.)
(e)
National Bureau of Standards, Washington, D.C. — National
Electrical Safety Code.
(f)
Reflector and Lamp Manufacturers Institute, Inc., 307 North
Michigan Avenue, Chicago, Illinois — Lamp Reflector.
(g)
Underwriters' Laboratories Inc. — Standards.
(h)
OSHA standards, where applicable, shall also be met, including
those for temporary wiring on construction sites.
(17)
All necessary permits and fees for this work shall be secured
and paid for by the contractor. Inspection shall be by an approved
inspection agency licensed by the Commonwealth of Pennsylvania and
final certificate of approval shall be delivered to the Borough prior
to acceptance.
O.
Phase Converter.
(1)
If single phase power is the only source of utility power and
the motors must operate from three phase, then a phase converter shall
be used.
(2)
Phase converter shall be static using capacitors and auto transformer,
no rotary phase converter is acceptable. The converter shall independently
operate two duplex pump motors. House in a NEMA 1 enclosure indoors
or a NEMA 3R enclosure if outdoors, pad-mounted if outdoors, lockable
enclosure; unit shall be Ronks Duo Add-A-Phase or approved equal;
field adjust the capacitors to the motor loads.
P.
Startup.
(1)
The contractor shall provide the services of fully qualified
manufacturer's representatives for services during installation, at
start-up, for instructing the Borough's personnel in the operation,
routine maintenance and "trouble shooting" for all equipment, mechanical
and electrical, furnished with the pumping station.
(2)
Contractor shall full load the generator for four continuous
hours using a contractor furnished load bank. If testing stops for
any reason, correct the problem and start a new four hour test. Submit
test results to the Borough, contractor shall notify the Borough and
the Engineer at least 48 hours prior to performing load test.
(3)
The contractor shall provide five bound copies of a manual fully
explaining the operation, routine maintenance and "trouble shooting"
for equipment. The manuals shall include copies of all shop drawings
with all required revisions. These manuals must be submitted to the
contractor for approval prior to acceptance.
(4)
The manuals must include information relative to suppliers of
spare and replacement parts.
[Ord. 751, 4/21/1996, § D]
1.
Laying Pipe, Bedding and Backfill.
A.
All pipe shall be laid to a uniform line and grade, bell ends upgrade,
with a firm and even bearing along the barrel of the pipe. The spigot
end of the pipe is to be centered in, shoved tight and secured against
the bell of the previously laid pipe. The interior of each pipe shall
be cleaned of all excess joint and foreign material before the next
pipe is laid. Pipe-laying shall commence at the lowest point and proceed
upgrade. At the close of each day's work and at such other times when
pipe is not being laid, the open end of the pipe shall be protected
with a close fitting stopper.
B.
The trench shall be excavated to a depth of six inches below the
outside diameter of the pipe barrel, or deeper if so specified. The
resultant subgrade shall be undisturbed, or compacted as approved
by the Engineer, if disturbed. The bedding shall be thoroughly compacted.
C.
The bedding shall provide uniform and continuous bearing and support
for the pipe at every point between the bells.
D.
The pipe shall be bedded on six inches of B stone, the full width
of the trench, and shall be covered with b stone to a height of 12
inches over the top of the pipe.
E.
The trench may be filled with excavated material above the b stone
as specified above except that stones larger than eight inches may
not go in the trench and the fill shall not contain more than 20%
stone in total volume.
F.
The trench shall be properly tamped in lifts not to exceed the maximum
thickness for the type of tamping equipment being used. If the trench
is in an existing street, the surface is to be restored as required
by the regulating authority.
G.
All bedding and backfill shall be compacted to 95% of maximum dry
density per ASTM T-180 method D test.
H.
During the installation of a force main, the pipe shall be laid at
a constantly increasing grade to each high point, air release manhole,
or point of discharge, as shown on the contract drawings. The contractor
shall provide sufficient construction control to assure that there
are no sags or decrease in slope in the force main which could tend
to accumulate air other than at the high points shown on the drawings.
Failure to comply with this requirement shall necessitate the contractor
take remedial steps to correct the situation. All such costs shall
be borne by the contractor.
2.
Special Bedding.
A.
Concrete Cradle and Concrete Encasement.
(1)
Preparation. Prior to the formation of the cradle or encasement,
temporary supports consisting of timber wedges and solid concrete
bricks or cap blocks shall be used to support the pipe in place. Temporary
supports shall have minimum dimensions and shall support the pipe
at not more than two locations, one at the bottom of the barrel of
the pipe adjacent to the shoulder of the socket and the other near
the spigot end.
(2)
Placing.
(a)
After jointing of the pipe has been completed, concrete shall
be uniformly poured beneath and on both sides of the pipe. Placement
shall be done by the use of suitable equipment. The concrete shall
be wet enough during placement to permit its flow, without excessive
prodding, to all required points around the pipe surface. The width
of cradle shall be such as to fill completely the trench width. In
case of extremely wide trenches, concrete encasement may be confirmed
above the top of the pipe to a narrower width, but in no case shall
it be less than the width of trench required for the size of pipe
being used.
(b)
Before depositing concrete, the space within the limits of the
pour shall have been cleared of all debris and water. Water shall
not be allowed to rise adjacent to or flow over concrete deposited
for less than 24 hours. Concrete shall be protected from the direct
rays of the sun and kept moist, by a method acceptable to the Borough,
for a period of seven days or until backfilling is begun. In no case
shall backfilling begin within 24 hours of the time of placing and
the Borough shall have strict control of the rate of backfilling.
(3)
Design Mixes. The cradle or encasement shall be made with normal
weight concrete with a twenty-eight day compressive strength of 3000
psi.
B.
Unstable Subgrade. Where the bottom of the trench at subgrade is
found to be unstable or to include ashes, cinders, any type of refuse,
vegetable, or other organic material or large pieces or fragments
of inorganic material, which, in the opinion of the Borough, should
be removed, the contractor shall excavate and remove such unsuitable
material to the width and depth recommended by the Borough. Before
pipe is laid, the subgrade shall be formed by backfilling with 2B
stone in three inch (uncompacted thickness) layers thoroughly compacted
to a Proctor density of 95% and the bedding prepared as hereinbefore
specified.
C.
Special Foundations. Where the bottom of the trench at the subgrade
is found to consist of material which is unstable to such a degree
that, in the opinion of the Borough, it cannot be removed and replaced
with an approved material thoroughly compacted in place to support
the pipe properly, the contractor shall construct a foundation for
the pipe, consisting of piling, timbers or other materials, in accordance
with plans approved by the Borough.
D.
Excavation in Fill. When the pipe is to be laid in fill, prior to
excavation, the fill shall be compacted to a proctor density of 95%
to a height of 12 inches above the proposed top of the pipe.
3.
Backfilling Methods.
A.
Backfilling shall not be done in freezing weather except by permission
of the Borough, and it shall not be done with frozen material. No
backfilling fill shall be done if the material already in the trench
is frozen.
B.
In State highways all backfill shall be in accordance with the requirements
of PA DOT Chapter 459. The requirement for backfilling in other streets
shall be as required by the Borough.
4.
Pipe Clearance in Rocks.
A.
Ledge rock, boulders and large stones shall be removed to provide
a clearance of at least six inches below and on each side of all pipe
and fittings for pipes 24 inches in diameter or less, and nine inches
for pipes larger than 24 inches in diameter.
B.
The specified minimum clearances are the minimum clear distances
which will be permitted between any part of the pipe and/or fitting
being laid and any part, projection or point of such rock, boulder
or stone.
C.
Excavation for laterals shall extend four feet beyond the end of
the lateral and backfilled with selected excavated material.
5.
Pipes at Manholes or Other Rigid Structures. Pipes directly connected
to or supported by rigid structures, shall not have a length beyond
the rigid support in excess of that shown in the manhole detail on
Plate 1.
6.
Manholes.
A.
Unless otherwise noted, manholes shall be constructed of precast
concrete with cast iron frames and covers, as shown on Plate 1 contained
herein. The invert channels shall be smooth and semicircular in shape
conforming to the inside of the adjacent sewer section. Changes in
direction of flow shall be with a smooth curve of as large a radius
as the size of the manhole will permit.
B.
Changes in size and grade of the channels shall be made gradually
and evenly. The invert channels may be formed directly in the concrete
of the manhole base, may be built up with brick and cement grout,
may be half tile laid in concrete, or may be constructed by laying
full section sewer pipe through the manhole and breaking out the top
half after the surrounding concrete has hardened. If this method is
utilized, the manhole floor shall form a neat joint with the pipe
barrel. The floor of the manhole outside the channels shall be smooth
and shall have a slope toward the channels of not less than two inches
per foot and not more than four inches per foot.
7.
Lateral Sewers. Fittings, (Wye branches, risers and bends) and lateral
sewer pipe shall be furnished and installed in strict accordance with
these specifications and any and all practices and precautions required
for the main sewers are equally applicable to the lateral sewers.
Lateral sewers shall be a minimum four-inch diameter, and shall be
installed to serve all lots. Installation shall be at a minimum 1%
slope, shall be to a point five feet behind curb line or edge of street,
or one foot beyond the road right-of-way, whichever is the greater
and shall include a water-tight plug at the end. Excavation, in any
material, shall extend for four feet beyond the end of the lateral
for the full depth of the lateral. Prior to backfilling, a minimum
two inch x four inch wooden marker shall be placed against the end
of each lateral, and shall extend a minimum of 12 inches above the
ground.
8.
Grade and Alignment Control. Prior to construction, the contractor
shall furnish three copies of a grade sheet for each manhole run to
the Borough. Grade and alignment control shall be established by one
of the following methods:
[Ord. 751, 4/21/1996, § E]
1.
Gravity Sewers.
A.
Alignment. After the mains have been laid and backfill placed to
a depth of 1 1/2 feet above the top of the pipe, a light will
be flashed between manholes or manhole locations to determine whether
the alignment of the sewer is true and whether any pipe has been displaced,
broken or otherwise damaged subsequent to laying. This test will again
be conducted before final acceptance of the sewer. Each section (manhole
to manhole) of sewer shall show a good light circle throughout its
length and any and all defects shall be corrected to the satisfaction
of the Borough before acceptance. Sewers shall be tested for leakage
only after all sewers and lateral sewers, including stoppers, are
installed.
B.
Leakage Tests.
(1)
Each sewer section between manholes including all laterals will
be tested with low pressure air. Testing will be done only after all
back-filling has been completed and trench settlement has been minimized.
The contractor shall furnish all labor, materials, water, tools, equipment
and accessories necessary to perform the required tests. All tests
shall be made in the presence of, and to the complete satisfaction
of, the Borough.
(2)
The pipe shall remain under pressure for not less than two minutes
before the test begins, to allow equilibrium of the air temperature
with the pipe wall.
(3)
The minimum test pressure, measured in pounds per square inch
(psig), shall be calculated by the following formula:
|
(D / 2) + 2
| |
|
Where D = Depth of the deeper manhole in feet
| |
|
Example: D = 9.6 feet
| |
|
Minimum Test Pressure = (9.6 / 2) + 2 = 6.8 psig
|
(4)
In no case shall the test pressure in the sewer or the laterals
be greater than the maximum differential joint pressure recommended
by the manufacturer of the pipe.
(5)
The contractor shall repair or replace all defective material
and/or workmanship and shall conduct such additional retests as required
to demonstrate that the sewer meets the requirements, at his own expense
and at no additional cost to the Borough. All materials and methods
used to repair the sewer shall meet with the approval of the Borough's
Engineer.
2.
Manhole Testing.
A.
All manholes shall be tested for water infiltration. The contractor
shall furnish all labor, materials, water, tools, equipment and accessories
necessary to perform the required tests. All tests shall be made in
the presence of and to the complete satisfaction of the Borough.
B.
The manhole shall be thoroughly cleaned and all openings sealed to
the satisfaction of the Borough. All pipe openings in the base and
the wells shall be plugged with plugs properly designed to provide
a watertight seal.
(1)
Vacuum Test. Manholes shall be tested by applying a negative
(vacuum) pressure measured in pounds per square inch, as calculated
by the following formula:
|
(D / 2) + 1
| ||
|
Where D = Depth of the manhole in feet
| ||
|
Example: D = 9.6 feet
| ||
|
Minimum Test Pressure = (9.6 / 2) + 1 = 5.8 psig
| ||
|
The manhole shall be considered acceptable if the air infiltration
does not increase the negative (vacuum) pressure by more than one
psig in the time as calculated by the following formula:
| ||
|
Six minutes - (D x 10) seconds
| ||
|
Where D = Depth of manhole to the next even foot
| ||
|
Example: depth of manhole = 8.35 feet. Then D = nine
| ||
|
Minimum time allowed for pressure increase of one psig = six
minutes - (9 x 10) seconds = four minutes 30 seconds
| ||
(2)
Water Test.
(a)
The Borough may permit the testing of manholes by filling with
water.
(b)
After the manhole has been properly cleaned and sealed, it shall
be completely filled with water. To allow for the water absorbed by
the manhole, the manhole to be tested shall be completely filled with
water for a minimum period of 12 hours prior to the test.
(c)
At commencement of the test, the manhole shall be filled with
water to a point level with the top of the manhole. The amount of
exfiltration shall be determined from the loss in water level converted
into gallons per day. The manhole being tested shall be considered
"acceptable" when there is no loss in water level for a period of
two hours.
(d)
If any manhole fails to meet the testing requirements, the contractor
shall determine at his own expense the source or sources of leakage.
(e)
The contractor shall repair or replace all defective material
and/or workmanship and shall conduct such additional retests as required
to demonstrate that the manhole meets the requirements, at his own
expense and at no additional cost to the Borough. All materials and
methods used to repair the man-holes shall meet with the approval
of the Borough's Engineer.
3.
Hydrostatic Tests for Force Mains.
A.
Pressure Test.
(1)
After the pipe has been laid and backfilled as specified, all
newly laid pipe, shall be subjected to a hydrostatic pressure of 150
pounds per square inch, or 150% of the normal working pressure, whichever
is greater.
(2)
Where any section of a main is provided with concrete reaction
backing, the hydrostatic pressure test shall not be made until at
least five days have elapsed after the concrete reaction backing was
installed. If high early strength cement is used in the concrete reaction
backing, the hydrostatic pressure test shall not be made until at
least two days have elapsed.
B.
Duration of Pressure Tests. The duration of each pressure test shall
be at least two hours or as determined by the Engineer.
C.
Procedures. Each section of pipe shall be slowly filled with water
and the specified test pressure, based on the elevation of the lowest
point of the line or section under test and corrected to the elevation
of the test gauge, shall be applied by means of a pump connected to
the pipe in a manner satisfactory to the Borough's Engineer. The pump,
pipe connections, and all necessary apparatus, including gauges, shall
be furnished by the contractor and are subject to approval by the
Engineer. The contractor will make all taps into the pipe, and furnish
all necessary assistance for conducting the tests.
D.
Expelling Air Before Test. Before applying the specified test pressure,
all air shall be expelled from the pipe. If permanent air vents are
not located at all high points, the contractor shall make the necessary
taps at such points before the test is made. After the test has been
completed the contractor shall remove and plug the taps or leave them
in place at the direction of the Engineer.
E.
Examination Under Pressure. Any cracks or defective pipes, fittings,
or valves discovered in consequence of this pressure test, shall be
removed and replaced by the contractor with sound material, and the
test shall be repeated until satisfactory to the Engineer.
F.
Test pressure Variations. Test pressures shall not vary by more than
five psi for the duration of the test.
G.
Saturation of Cement Lining. It is good practice to fill the pipeline
to be tested 24 hours in advance of the test to allow the cement lining
of the pipe to become saturated.
H.
Test Failure. Should the test pressure not meet the requirements
specified above, the contractor shall, at his own expense, locate,
repair and replace the defective joints, pipe or fittings until the
pressure is maintained within the specified allowance.
[Ord. 751, 4/21/1996, § F]
All sanitary sewer lateral connections shall be fitted with
a backflow preventor approved by the Borough Engineer. The backflow
preventor shall be located outside of the Borough's right-of-way between
the unit(s) and the right-of-way line. The backflow preventor shall
be owned and become the responsibility of the individual property
owner(s) upon installation and satisfactory testing by the Borough
Engineer.
