[Ord. No. 11-2I 118 §1, 5-12-2016]
A.
All materials used in the construction of sanitary sewers shall conform
to the latest revision of the City of Farmington Standard General
Conditions and Technical Specifications for Public Works Construction
and the Missouri Department of Natural Resources requirements unless
specifically designated otherwise by special provision drawings and
prior approval is obtained.
B.
Whenever possible, structures shall be constructed as shown in the
standard drawings. Structures other than those shown in the standard
drawings shall be considered to be special structures and must be
designed and detailed by the design engineer.
C.
Tendering of the sanitary sewer line and appurtenances must be made
prior to acceptance of the sanitary sewers by the City.
D.
Where a sewer must be constructed on fill, a profile of the original
undisturbed ground line along sewer centerline shall be shown. All
sewers to be constructed on fill must have a special design approved
by the Public Works Director.
[Ord. No. 11-2I 118 §1, 5-12-2016]
A.
Sewer drawings shall be prepared on plans separate from other utilities.
1.
The plan shall be at the top of the drawing. Standard symbols
shall be used. A standard north arrow shall be located on each sheet
(pointing up or to the right).
a.
Scale shall be one (1) inch equals forty (40) feet horizontal
for undeveloped areas and one (1) inch equals twenty (20) feet for
developed areas, or an approved scale easily plotted at half scale.
b.
Sewers and manholes within streets and adjacent developed areas
shall be located in plan by dimensions from property markers or other
well-defined physical features.
B.
The profile shall be shown under the plan.
1.
Scale shall be one (1) inch equals four (4) feet vertical, and
one (1) inch equals forty (40) feet horizontal for undeveloped area
and one (1) inch equals twenty (20) feet for developed areas, or an
approved scale easily plotted at half scale.
2.
Elevations of existing manholes shall be determined in the field.
Existing ground and proposed pavement over sewer shall be shown and
labeled. Existing or proposed building floor elevations or sufficient
ground elevation one hundred (100) feet either side of centerline
shall be shown to determine required depth and slope of service lines.
C.
All existing and proposed utilities shall be accurately and clearly
shown in plan and profile. Elevations of existing utilities shall
be obtained where possibility of conflict exists.
D.
An index sheet shall be supplied, indicating the entire area to be
served by the proposed sewers and indicating the sheet number on which
each segment of sewer line is drawn. The scale shall be one (1) inch
equals one hundred (100) feet. When this cannot be done without attaching
an extra drawing, then the scale will be one (1) inch equals two hundred
(200) feet. Bench marks based on USGS datum shall be shown on the
drawings. The Department of Public Works will review the plans to
determine compatibility with overall City planning.
E.
Copies of drawings and reports submitted to the Missouri Department
of Natural Resources for permitting shall also be submitted to the
Public Works Department for review and approval. All downstream capacities
required on the permit application are to be accurate. Missouri Department
of Natural Resources approval of plans and specifications shall be
provided upon receipt.
[Ord. No. 11-2I 118 §1, 5-12-2016]
A.
Sanitary sewer systems shall be designed in accordance with the applicable
laws and regulations of the State of Missouri, including but not limited
to Design Guides presented in 10 CSR 20-8.
B.
Sanitary Sewer Mains.
1.
No public sewer shall be less than eight (8) inches in diameter.
2.
Private sewer laterals shall be connected utilizing a "wye"
connection as defined in the City of Farmington, Missouri, General
Conditions and Technical Specifications.
3.
Location. Public sewers shall be placed in
street right-of-way where feasible. Plans shall show the stationing
of all changes in direction and grade and also connections and sewer
laterals. Manholes shall not be located in the gutter pan or the curb
of the roadway.
4.
Public sewers shall be designed deep enough to prevent freezing,
and to allow house sewer laterals to cross under water mains at such
an elevation that the bottom of the water main is at least eighteen
(18) inches above the top of the sewer service line. If the proposed
sewer service is parallel to a water main, it shall be designed to
provide a minimum of 10-foot horizontal clearance from the water main.
Unless approved by the Director of Public Works, no sewer shall be
designed and/or constructed that will not provide a minimum depth
of three (3) feet to top of pipe. All PVC sewers over twelve (12)
feet deep shall be SDR 21, Class 200 pipe. All sewers over twelve
(12) feet deep shall have a minimum of twelve (12) inches of aggregate
bedding material over the top of the pipe.
5.
Sewers in streets should be placed in or near the center of
one (1) of the outside drive lanes where possible. Sewers located
at back property lines shall be a minimum of three (3) feet to one
(1) side of the property line and on the opposite side from pole lines
or other utilities. The ends of sewer lines shall extend at least
fifteen (15) feet beyond the property line of the last lot served
to a terminal manhole. This will provide room for the house connection
with a "wye" sewer lateral below the terminal manhole.
6.
Curved sewer alignment will not be permitted. Only under extreme
circumstances will curved sewer alignment be considered, and then
only for sewers larger than twenty-four (24) inches in diameter. Written
approval must be given by the Missouri Department of Natural Resources
and the Public Works Director for curved sewer alignment to be installed.
If a curved sewer alignment is approved, the minimum radius of curvature
shall not be less than three hundred (300) feet, the maximum deflection
of any individual joint shall not be more than two degrees (2°),
and the areas being sewered are presently developed (streets are in
place). Tracer wire as required for sewer force mains shall be installed
for curved sewer alignments and shall consist of standard electric
service wire, a single No. 12 U.L. approved copper wire of the solid
type with insulation for six hundred (600) volts. The tracer wire
shall be laid within six (6) inches from top of pipe. Wire shall be
brought up at manholes and securely anchored to manhole frame with
galvanized bolt.
7.
A minimum permanent easement of seven and one half (7.5) feet
either side of sewer is required when locating outside of public rights-of-way.
A temporary construction easement shall be provided, as necessary.
All crossing and/or cutting of streets must be backfilled with granular
material. All sewers with a trench wall within two (2) feet of the
back of the street curb shall be backfilled with granular material.
8.
The separation of sanitary sewers from other underground utilities,
such as water mains and storm sewers, and from streams shall conform
to the Missouri Department of Natural Resources regulations and guidelines.
9.
Non-sanitary sump pump foundation drain systems will not be
allowed to connect to the sanitary sewer system. Location of sump
pump discharge to the storm sewer systems shall be defined on design
plans.
C.
Manholes.
1.
Diameter. The minimum diameter of manholes
shall be forty-eight (48) inches (four (4) feet), and shall conform
to the latest revision of the City of Farmington Standard General
Conditions and Technical Specifications. All new inside drop manholes
shall have a minimum diameter of sixty (60) inches (five (5) feet).
2.
Manhole covers. All sanitary sewer manhole
covers shall be NEENAH R-1642 or approved equal.
3.
Stationing and elevation. Stationing and elevations
should be shown at all manhole locations.
4.
Lampholes are not permitted due to problems they cause for sewer
maintenance.
D.
Lift Stations.
1.
General.
a.
A sewage lift station shall consist of a wet well, sewage pumps,
control systems, electrical systems (normal and emergency), superstructures,
site security systems, grading, and access. The purpose and goal of
a lift station is to serve as a sewage collection point for a development
and to pump that sewage to a gravity line serving the area in a safe,
economical, and easily-maintained manner.
b.
Lift stations shall be designed in accordance with the applicable
laws and regulations of the State of Missouri, including but not limited
to the design criteria in 10 CSR 20-8.130.
2.
Buildings and grounds.
a.
The lift station design shall include provisions for security
and access as described in this Section.
b.
A fence surrounding the station site shall be provided. The
fence shall be eight (8) feet high (minimum) with a fifteen (15) foot
wide, double-leaf gate and a three (3) foot wide personnel gate. The
fence shall be galvanized chain link with vinyl privacy slats and
shall include three (3) strands of barbed wire supported by a galvanized
steel barbed wire support arm. Supporting posts for all types of fences
shall not be more than eight (8) feet apart and be concrete encased
below grade. Minimum bury depth of posts to be two and one-half (2 1/2)
feet. The gate is to be located so that entranceway does not go over
manholes. The pump station and generator unit is to be easily accessible
for maintenance from entranceway. The gate is to be set back twenty-five
(25) feet from edge of road. Wire mesh is to be nine (9) gauge. All
posts and gates shall be SS40. Top rail shall be SS20. Bottom tension
wire shall be seven (7) gauge. Aluminum ties shall be nine (9) gauge.
Rail ends, post caps and loop caps shall be steel.
c.
The area inside the fence must be constructed of four (4) inches of Type 1 aggregate, compacted according to City specifications, on four (4) mil polyethylene sheeting placed over the entire enclosed area. This sheeting shall have one (1) inch diameter perforations spaced not more than two (2) feet in each direction. Prior to placing the sheeting, the soil to be covered is to be treated with a soil sterilant Diuron (Karmer by DuPont), or equal, and applied as directed by the manufacturer. Final wearing surface shall consist of six (6) inches of concrete per the City of Farmington, Missouri, General Conditions and Technical Specifications, Chapter VII, Rigid Pavements.
d.
The pump station must be accessible by an acceptable all-weather,
hard-surface road meeting the same pavement section requirements as
other roads in the development. Junction of pump station road and
public street shall have a culvert of acceptable diameter and length
in ditch if necessary.
e.
An outside weatherproof pole-mounted, LED lighting fixture with
a minimum system wattage of one hundred twenty-six (126) watts at
one hundred twenty (120) volts, color 5000K and with a photocell for
dusk-to-dawn operation, on a dedicated circuit shall be provided.
The height of pole shall be a minimum of fifteen (15) feet but shall
be adequate to provide lighting for the entire site.
f.
Generator unit, switching gear and controls. Generator unit, switching gear, and controls shall be mounted inside
a weatherproof enclosure.
g.
The lift station facility shall be setback from the property
line to match requirements of adjacent development.
3.
The following items should be incorporated in the design of
sewage pumping stations:
a.
Type. Sewage pumping stations shall be wet
well, submersible-lift type.
b.
Structures.
(1)
Wet and dry wells including their superstructure
shall be completely separated.
(2)
Provision shall be made to facilitate removing
pumps and motors.
(a)
Submersible pump stations shall have a stainless
steel slide-coupling and guide-rails lifting system. A stainless steel
lifting cable, with one (1) end permanently attached to the pump-lifting
lug and the other end secured at grade level, shall be provided.
(b)
Where pump station is enclosed in a building, equipment
shall be provided for moving pumps and motors to the access doorway.
(3)
For dry or wet wells that have mechanical equipment that require personnel to access equipment inside the structure, access shall be provided per 10 CSR 20-8.130, Section (4) Design, subsection (B) structures, paragraph 3.
(4)
The dry well (overflow) must be an enclosed vault.
Open overflow ponds will not be permitted.
(5)
The wet and dry wells shall be constructed as detailed
on the plans, as approved by the Public Works Director, and per these
specifications. The base of the wet well shall be grouted on the inside
at a 1:1 slope to prevent the accumulation of solids.
c.
Pumps.
(1)
At least one (1) pump meeting the requirements
of the City of Farmington General Conditions and Technical Specifications
shall be provided. They must have the same capacity and each shall
be capable of handling flows in excess of the expected maximum flow.
(2)
There shall be stainless steel or aluminum trash
basket located at the inlet pipe with a stainless steel lifting chain
to provide for periodic removal and cleaning.
(3)
The minimum allowable pump size shall be five (5)
HP. If flow rates dictate a smaller pump, a Flygt NP3085 may be considered.
Written approval must be given to use less than five (5) HP size pumps.
(4)
The pump shall be so placed and a minimum water
level maintained such that under normal operating conditions it will
operate under a positive suction head.
(5)
Each pump shall have an individual intake. Wet
well design shall be such as to avoid turbulence near the intake.
(6)
Tandem mechanical seals are required on submersible
pumps.
d.
A shut-off valve shall be placed on the discharge lines of each
pump. A check valve with external arm shall be placed on each discharge
line between the shut-off valve and the pump.
e.
The wet well shall have a three (3) inch minimum diameter Type
304 stainless steel air vent extending through the top slab with a
one hundred eighty degree (180°) turn. All vents shall have a
charcoal filter at the end of the vent pipe. The filter shall be such
that the filter material may be replaced without replacing the vent
filter piping.
f.
Potable water shall be supplied; however, there shall be no
physical connection between the potable water supply and a sewage
pumping station. Potable water supply line shall not be smaller than
one-half (1/2) inch. A double check type back flow preventer and freeze-proof
hydrant with hose bib shall be located within ten (10) feet of pumping
station but not in the traffic path.
g.
Covers and safety grates shall be made of aluminum and constructed
so that it may be easily opened by one (1) person. If force required
to open cover is in excess of fifty (50) pounds, shock absorbers or
opening springs must be provided.
h.
Pump stations are to be provided with two (2) mechanical seals
and two (2) gasket kits to install with seals. If seal filters are
used, six (6) spares are to be included. Two (2) complete sets of
NEMA rated contacts and coils for starters and one (1) spare NEMA
rated alternator relay or timer shall also be furnished.
i.
A force main interface consisting of piping, a 45-degree "Y,"
45-degree elbow, and flanged, full-flow valve shall be provided.
j.
All electrical equipment and wiring shall comply with the currently
adopted revision of the National Electrical Code. Particular attention
should be given to electrical equipment enclosed in places where gases
may accumulate (hazardous areas). Submersible pumps in lift stations
are considered to be in a hazardous area and shall be compliant with
the NEC Class I, Group D, Division 1. This rating shall include pumps,
removal systems, and controls. All conduit shall be of galvanized
rigid type and shall be installed below grade wherever possible. Dry-type
transformers for 110-volt utility service and control systems power
shall be provided as necessary.
(1)
Primary power to the station shall be no higher
than 480-Volt, 3-Phase, and shall be provided by connection to a commercial
utility service. A single disconnect is to be provided between the
pump station and the utility.
(2)
Emergency operation. Provision
of an emergency power supply for pumping stations shall be made, and
may be accomplished by connection of the station to a second independent
public utility source or by provision of in-place engine generator.
(3)
The meter base and transformer will be provided
by the City of Farmington.
(4)
Provide a Square D phase pad lockable service entrance
disconnect with fuses. Ground the service entrance disconnect with
#2 bare copper conductor in three fourth (3/4) inch RGS conduit and
a five eighth (5/8) inch diameter, twelve (12) inches long, driven
rod.
(5)
Provide three (3) THW service conductors with insulated
grounding conductor to the package pump controller in conduit to the
disconnect and transformer.
(6)
The pump controller shall be capable of operating
both pumps simultaneously and provide circuit breaker for outside
light and 15A circuit breaker for GFCI receptacle.
(7)
Provide a junction box between the control panel
and wet well.
(8)
Provide two (2) conduits from the junction box
to the control panel which shall have sealing fittings installed per
the latest revision of the National Electrical Code.
(9)
Provide two (2) RGS conduits for motor cables from
the junction box to the pump basin.
(10)
Provide one (1) RGS conduit for float cable from
the junction box to the pump basin.
(11)
Provide one (1) RGS conduit to valve box for sump
pump from valve box to pump basin unless valve box has a gravity drain.
(12)
Provide one (1) RGS conduit from the transformer
to the service disconnect.
(13)
Mount panels and boxes rigidly on galvanized uni-strut
with anchored base.
(14)
All conductors entering the junction box from
the wet well shall be sealed with a cord grip at the junction box.
(15)
The pump cable entering the junction box shall
be a single cable containing the power and sensor conductor in one
(1) jacket.
(16)
The junction box shall contain two (2) terminal
blocks; one (1) for power cables and the other for sensor wiring.
(17)
All boxes shall be NEMA 4 rated, lockable and
made of stainless steel.
(18)
The control panel shall be heated and have one
(1) lockable handle that is capable of opening and locking the door
when actuated.
(19)
Provide an audible and visible alarm that may
be canceled with the push of a single button.
(20)
The control circuit shall contain a phase monitor
with indication contacts.
(21)
Contactors shall be NEMA size 3 or 4 with thermal
protection with resets and indicators for "on" and "over load."
(22)
Each motor contactor shall be on a dedicated circuit
breaker.
(23)
The terminal block for service entrance shall
be divided for the dual pumps.
(24)
The transformer secondary shall be fused.
(25)
Provide an additional 120-volt control circuit.
(26)
Provide an alternator to cycle the pumps.
(27)
The seal fail probe shall indicate a seal failure
but not disable the pumps. The City reserves the ability to run the
pumps with a seal failure.
(28)
The control panel shall have a hand-off-auto switch,
a run and seal fail light and an hour meter for each pump.
(29)
The contractor is responsible for the cost and
installation of communication lines for SCADA system.
(30)
A 120-volt circuit shall be provided for SCADA
system.
(31)
No wood of any kind is to be used for the permanent
fixture.
(32)
A lightning arrestor shall be provided to protect
electrical system.
(33)
Three (3) copies of the Operation and Maintenance
Manual and a spare pump shall be provided to the City before final
acceptance.
k.
Controls. Control of pumps shall be Multitrode
liquid level sensing probe or Mercury Float Switch System with four
(4) sensors. The sensors shall be used to indicate "PUMPS OFF," "FIRST
PUMP ON," "SECOND PUMP ON," "HIGH LEVEL ALARM." The control panel
shall include automatic pump alternation to equalize operating time
on all duplex components. Elapsed time meters to be calibrated in
one-tenth (0.1) hour increments on all pumps. Provisions shall be
made to bypass the alternator in the event that either pump is out
of service for maintenance. Motor starter coils to be rated one hundred
(100) Volts, sixty (60) Hertz. On larger lift station installations
other control systems may be required. Hand-off-auto switch and elapsed
time meters to be visible and operable through control panel door.
l.
Alarm systems. Alarm systems shall be provided
for all pumping stations to work with the existing SCADA system the
City has for the lift stations.
m.
Power generating equipment.
(1)
The power module shall consist of an engine, generator,
and control panel assembly, all mounted with anti-vibration mounts
onto a fabricated steel skid base. An automatic transfer switch may
be mounted separately or in the control panel assembly to automatically
switch to emergency power in the event of commercial power failure.
The engine generator shall be sized for starting one (1) pump and
all auxiliary loads, with an additional fifty percent (50%) overload
capacity. The complete power module shall be factory assembled and
factory tested to ensure that all controls and protective devices
are in proper working order. The motor starting capability shall be
tested by a simulation of the exact operating load, with certified
test results provided. The power module must be coordinated with the
pump station.
(2)
The engine shall be multi-cylinder, diesel or natural
gas, and water-cooled. Water-cooled engines shall be provided with
mounted radiator, fan and water pump with anti-freeze added to the
cooling system to bring it to twenty degrees Fahrenheit (20° F.)
below zero protection. The fuel system shall consist of a carburetor
with an automatic choke and an electric shutdown solenoid, and a dry-type
air cleaner. The engine shall run on any reputable commercially available
natural gas with minimum low-heat value of nine hundred fifty (950)
BTU/cubic foot. The Governor shall be capable of three percent (3%)
to five percent (5%) speed regulation from no load to rated load.
The lubrication system shall be force fed by gear oil, pumped to all
connecting rods, main bearings, and rocker arms. Oil filter shall
be spin-on, full-flow type. Engine may be operated continuously when
tipped up to fifteen degrees (15°) in any direction. The engine
starting system shall consist of a 12-volt battery and a 12-volt Bendix-type
drive, solenoid-equipped electric starter. The charge on the battery
shall be maintained by a 32-amp or larger charging alternator. A water-cooled
engine shall be equipped with a jacket water heater to aid in starting
and engine longevity.
(3)
The alternator shall be a full 3-phase, 4-pole,
self-excited, brushless, revolving field type with static exciter.
It shall be self-regulated and designed specifically for motor starting
application. The alternator shall be directly connected to the engine
flywheel housing and driven through a semi-flexible driving flange
to ensure permanent alignment. It shall have drip-proof construction.
Voltage regulation shall be within plus or minus five percent (5%)
of rated voltage from no load to full load.
Insulation shall be Class F with a seventy degree (70° Celsius)
maximum temperature rise. A completely wired and assembled generator
control panel shall be furnished. It shall contain the following items:
1. One (1) ammeter with phase selection switch; 2. One (1) voltmeter
with phase selection switch; 3. One (1) vibrating-vane type frequency
meter; 4. Integral battery charger 0-10 amp. and 5. A line circuit
breaker for alternator output leads.
(4)
The automatic transfer switch shall be a mechanically-held,
double throw. The transfer action must be completely electrical and
not rely on springs or counterweights. Operating coils must be momentarily
energized from the source to which the load is being transferred.
The switch must be interlocked both mechanically and electrically
to prevent both sources from feeding the load at the same time. Electrical
operation must not allow a neutral position. The main contacts of
the transfer switch shall meet with a rolling and wiping action. They
shall be copper with cadmium plating up to and including one hundred
(100) amps and silver plating on all sizes above one hundred (100)
amps. They shall be rated for all classes of load to 480-volt AC and
equipped with blowout coils and arc chutes. They shall have air inrush
current rating of twenty (20) times rated current and an interrupting
capacity of one and one half (1.5) times rated current. The transfer
switch shall include auxiliary contacts to provide for the locking
out of the standby pump and connection to alarm system. It shall also
have three voltage-sensitive relays with dropout seventy percent (70%)
to eighty percent (80%) adjustable pickup at ninety percent (90%).
Upon sensing of under-voltage condition, the generator startup and
transfer sequence shall be initialed automatically. Provision shall
also be made to manually initiate the sequence.
(5)
The engine control panel is to include five (5)
ten-second-on/10-second-off cranking cycles, a switch for testing
the automatic operation, a switch for deactivating the automatic operation,
an oil pressure gauge, coolant temperature gauge, battery charging
DC ammeter, elapsed time meter, indicating lights for fail-to-start,
line-power-on, and standby-power-on, protective shut-down, with indicating
lights for engine overspeed, low oil pressure, overload, high coolant
temperature, manual start-run-stop switch, 0-60-second time delay
on transfer Normal to Emergency, 0-30-minute time delay on transfer
Emergency to Normal, 0-5-minute time delay after transfer to normal
for engine cool down, contacts to signal emergency power on, contact
to signal fail-to-start, contact to signal protective shut-down and
fail-to-start, and a weekly exercise timer.
(6)
The unit shall be bolted in place. Facilities shall
be provided for unit removal for purposes of major repair or routine
maintenance.
(7)
The unit internal combustion/diesel engine shall
be located above grade with exhaust muffler and outlet located outside
of housing. The muffler system shall be residential type or better.
Exhaust sleeve from building to be approved by National Fire Protection
Association Code.
(8)
Engine cooling ventilation.
(a)
Cooling air shall be provided by venting from the
outside to the engine. The vent shall be properly located and sized
to assure an adequate air supply. Vents are to have screen on inside
to prevent bugs and birds from entering.
(b)
Engine housing shall have adequate ventilation
to maintain a safe equipment operating temperature.
(9)
Emergency power generation. All
emergency power generation equipment shall be provided with instructions
indicating the essentiality of routinely and regularly starting and
running each unit at full load.
(10)
Generator spare parts. Generator
spare parts are to include one (1) spare circuit board of each type
used, or provide a means for bypassing and testing circuits.
4.
Acceptance of lift station.
a.
Shop drawings. Shop drawings shall be submitted
on lift station, stand-by power source and structures, and shall be
approved prior to installation.
b.
Testing. Prior to acceptance of lift stations
by the City, testing of each equipment item shall be required in the
presence of the contractor, a City representative, and the equipment
manufacturer's representative. Final acceptance will not be made until
all deficiencies are corrected and retesting is performed. A draw-down
test to verify performance of the pump rate will be required.
c.
As-builts. Prior to acceptance of operation
of lift station, generator units, and other related appurtenances
by the City, two (2) sets of "as-built" drawings shall be submitted.
d.
Operation and maintenance manuals. Two (2)
complete sets of operational instructions shall be provided to include
emergency procedures, maintenance schedules, maintenance manuals,
and service manuals on all equipment. Special tools and such spare
parts as may be necessary shall be furnished to the City for the facilities
to be accepted.
E.
Force Mains.
1.
At design average flow, a cleansing velocity of at least two
(2) feet per second shall be maintained.
2.
An APCO Sewage Air Release Valve Model 401, or approved equal,
shall be placed at high points in the force main to prevent air locking.
A standard four-foot diameter manhole with standard frame and cover
to be installed around force main and relief valve for maintenance
access to valve.
3.
The force main shall connect to the gravity sewer system at
a point not more than two (2) feet above the flow line of the receiving
manhole.
4.
The force main pipe and fittings shall be designed to withstand
normal pressure and pressure surges.
5.
MegaLug restrained joints or approved equal shall be provided
at all bends twenty-two and one-half degrees (22 1/2°) or
greater. Concrete thrust blocking shall not be used.
6.
All force main pipe shall be SDR21, Class 200 PVC pipe. Pipe
types must be shown on the plans.
7.
Force main pipe shall be designed and so constructed to provide
a minimum depth of three (3) feet of cover over the top of the pipe.
8.
Force mains designed to cross public streets must be encased
with either reinforced concrete pipe or steel casing of adequate size
to allow for future removal of the force main pipe.
9.
Testing of the force main is required in accordance with the
requirements of AWWA C-605.
10.
Tracer wire for force mains shall be the same as that specified
for water lines in the City of Farmington General Conditions and Technical
Specifications.
