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force that can be exerted on the pipe without damaging the
integrity of the pipe or pipe joints. The installation head or
mechanism shall incorporate a gauging system, which will provide
a continuous monitor of the force being applied during the liner
insertion operations. The insertion force used by the Contractor
shall in no case exceed the maximum allowable pushing or pulling
force as calculated in the liner pipe design. Pipe spigots shall be
provided with “homing” marks to ensure that the joint is properly
completed.

If the liner pipe cannot or is not pushed or pulled continuously
through a manhole base section, then the Contractor shall provide a
smooth and continuous transition through the manhole from one
liner pipe section to the next. A non-shrink grout shall be used to
obtain a smooth and continuous transition through a manhole when
the liner pipe is not carried through the manhole.

B. Pneumatic Hammer Assisted Sliplining

1.

Prior to sliplining installation, during excavation of the insertion
pit, the contractor shall layout and fuse two lengths of HDPE
suitable for lining in each direction from the insertion pit as shown
on the drawings.

During installation the Contractor shall pull the renewal pipe into

place utilizing a constant tension, variable speed winch. The

winch shall:

a. Be equipped with a telescoping boom

b. Accommodate setup in existing manhole structures with no
structure modifications, unless approved by Engineer in
writing.

c. Be capable of applying 12 tons of constant line tension.

d. Not be capable of exceeding tensile strength of affixed
winch cable.

e. Lower winch unit pulley assembly must rotate 360°
allowing winch to be oriented in any direction.

f. Load dispersing winch mast legs shall be designed to accept
Expander assembly and new pipe entirely into manhole
without structural manhole modification.

The contractor shall utilize a pneumatic powered, reversible
direction hammer. The hammer shall be capable of insertion into
the renewal pipe from the tail end, travel through the renewal pipe,
pass partially through a hardened steel expander head, and attach to
constant tension variable speed winch.

02769-13

3.4

C.
1.
2.
3.
4.
TESTING
A.

The contractor shall utilize a manufactured hardened steel host
pipe expansion head sized so that the expansion head forces and
internal host deflections away from passing HDPE renewal pipe, to
facilitate installation in a partially deflected host pipe.

Segmental Static Sliplining

During installation the Contractor shall pull the renewal pipe into
place utilizing a constant tension, variable speed pulling frame.
The frame shall:

a. Accommodate setup in existing manhole structures with no
structure modifications, unless approved by Engineer in
writing.

b. Be capable of applying 40 tons of constant line tension.

The contractor shall utilize a manufactured hardened steel host
pipe expansion head sized so that the expansion head forces and
internal host deflections away from passing HDPE renewal pipe, to
facilitate installation in a partially deflected host pipe.

The contractor shall utilize a manufactured steel resistance plate
behind the renewal pipe to distribute pulling forces along the
length of the renewal pipe string.

The contractor shall pull pipe segments individually into the host
pipe behind the expansion head and associated tooling, assembling
threaded and fused pipe segments within the access manhole as
each individual segment is pulled into the host pipe.

Testing shall be required after the s pneumatically assisted slipline pipe
has been installed. The pneumatically assisted slipline pipe shall be tested
before it has been sealed in-place at the manholes, and before any service
reconnections have been made. The purpose of this test is to check the
integrity of the joints that have been made and to verify that the slipline
pipe has not been damaged by inserting it through the host pipe.

1.

Low Pressure Air Test Procedure - After a manhole-to-manhole
section of the pipe has been replaced, and prior to any service lines
being connected to the slipline pipe, the pipe shall be plugged at
each manhole with pneumatic plugs.

The design of the plugs shall be such that they will hold against the

test pressure without requiring external blocking or bracing. One
of the plugs shall have three air hose connections; one to inflate the

02769-14

3.5

3.6

plug, one to attach a gauge for reading the air pressure in the sealed
line, and one to introduce air into the sealed line.

Low pressure air shall then be introduced into the sealed line until
the internal air pressure reaches 4.0 psig greater than the average
back pressure (the design groundwater pressure) on the pipe. At
least two minutes shall elapse to allow the pressure to stabilize.

The time required for the internal pressure to decrease from 3.5 to
2.5 psig greater than the average back pressure (groundwater
pressure) on the pipe shall not be less than the time shown for a
given pipe diameter in the following table:

NEW PIPE DIAMETER (INCHES) MINIMUM ELAPSED TIME
(MINUTES)
8 and smaller 4
10 5
12 6
15 and larger 7

POST-TELEVISION INSPECTION OF COMPLETED SECTIONS

A. The Contractor shall provide to the Owner a color videotape, taken by a
360 degree view camera for close-up view, showing the completed work,
including the condition of the restored pipes and service connections, prior
to requesting payment.

1.

CLEAN-UP

Pipe shall be true to line and grade, with no visual bulges, sags,
protrusions, deflections, offset joints, leaking joints, or other
visible infiltration, or other defects that would impair the intended
use of the completed pipeline. Any repairs necessary as a result of
this inspection shall be performed by the Contractor, at no
additional expense to the Owner. Final acceptance of renewal
work shall not be granted until all defective areas are repaired to
the Owner’s satisfaction.

A. Upon completion of the sliplining operation, the Contractor shall restore
all areas disturbed by these operations.

02769-15

PART 4 — Measurement and Payment

4.1 SUMMARY

A.

Measurement and payment for all additional items included in this
Construction Change Directive shall be as described in Section 01025
Measurement and Payment of the Contract Documents.

4.2 ITEM DESCRIPTIONS

A.

B.

C.

Item 1,

1.

Item 2,

Item 3,

Pneumatic Hammer Assisted Sliplining

Under the unit price for Item 1 of the work, the Contractor shall slip
line sewers as described above under Section 3.3.B Pneumatic
Hammer Assisted Sliplining. The unit price shall also include pre
post CCTV, flow bypassing, and all other appurtenant materials and
work incidental thereto and not specifically included for payment
under other items.

Measurement for payment will be by the linear foot of sewer
sliplined as approved by the Engineer as measured along the
horizontal projection of the centerline of the pipe from center to
center of manholes..

Segmental Static Sliplining

Under the unit price for Item 2 of the work, the Contractor shall slip
line sewers as described above under Section 3.3.C Segmental Static
Sliplining. The unit price shall also include pre and post CCTV, flow
bypassing, and all other appurtenant materials and work incidental
thereto and not specifically included for payment under other items.

Measurement for payment will be by the linear foot of sewer
sliplined as approved by the Engineer as measured along the
horizontal projection of the centerline of the pipe from center to
center of manholes.

Service Re-Connections

Under the unit price for Item 3 of the work, the Contractor shall re-
connect existing service connections after pneumatically assisted
sliplining the sewer. The unit price will include connecting the
service pipe to a wye branch, or other approved means of
connection, on the pneumatically assisted sliplined gravity sewer
main, transition couplings as required, restrained joints, and
furnishing and placing bedding material (crushed stone and/or sand).

02769-16

D.

Item 4,

Item 5,

Ttem 6,
Hours

The unit price shall also include all other appurtenant materials and
work incidental thereto and not specifically included for payment
under other items.

Measurement for payment will be per connection and as approved by
the Engineer.

Excavation for Pneumatically Assisted Sliplining Pits

Under the lump sum price for Item 4 of the work the Contractor shall
excavate as necessary and as approved by the Engineer to allow
access for Pneumatic Hammer Assisted Sliplining. Included under
the lump sum price is payment for excavation and backfill,
dewatering, support of excavation, erosion and sedimentation
control, compaction, furnishing and placing gravel borrow base
under paved areas, landscaping restoration including restoring
pavement, all labor, services, and equipment necessary for
excavation.

Removal and Re-installation of RCP Drain

Under the unit price for Item 5 of the work the Contractor shall
remove existing 36” RCP drain from the sliplining access pit as
required for sliplining operations and replacement with reconnection
after pneumatically assisted sliplining is complete. The unit price
shall also include all other appurtenant materials and work incidental
thereto and not specifically included for payment under other items.

Measurement for payment will be by the linear foot of 36” RCP
drain pipe removed for pit excavation as approved by the Engineer
as measured along the horizontal projection of the centerline of the
removed pipe.

NSTAR Electric Field Inspector Services Beyond Normal Working

Payment will be made for expenses billed to the Contractor by
NSTAR Electric for Field Inspector services beyond normal
working hours. The Contractor shall record the actual amount paid
to NSTAR Electric and shall submit the amount billed for work
outside of normal working hours, in four copies, to the Engineer
who will review such amount, when verified, in payment requests
from the Contractor to the Owner.

02769-17

No mark-up for Field Inspector services will be allowed. Only
documented NSTAR invoice amounts will be reimbursed to the
Contractor.

END OF SECTION

02769-18

SECTION 02800

MANHOLE REHABILITATION

PART 1 - GENERAL

1.01

A.

1.02

1.03

SCOPE OF WORK:

Provide all labor, materials, accessories, equipment, tools, and incidentals required to
renabilitate and test manholes as shown on the Drawings and as specified herein,
including surface preparation, flow diversion, inflow control, invert and channel
reconstruction, internal lining, chimney seals, and pipe connections.

The manhole rehabilitation products shall be fabricated from materials which, when
installed, shall mitigate or terminate infiltration and snall be chenically-resistant to
withstand exposure to domestic sewage.

RELATED WORK SPECIFIED ELSEWHERE:

Section 01300 — Submittals
Section 02760 — Structural Grouting

REFERENCE SPECIFICATIONS, CODES, AND STANDARDS:

Without limiting the generality of the other requirenents of the Specifications, all
work herein shall conform to the applicable requirenents of the following
documents. All referenced specifications, codes, and standards refer to the most
current issue available at the time of Bid.

1. ASTM C109 Standard Test Method for Compressive Strength of
Hydraulic Cenent Mortars (Using 2-in. or [50-mm] Cube
Specimens)

2. ASTM C273 Standard Test Method for Shear Properties of Sandwich
Core Materials

3. ASTM C293 Standard Test Method for Flexural Strength of Concrete

(Using Simple Beam With Center-Point Loading)

4. ASTM C496 Standard Test Method for Splitting Tensile Strength of
Cylindrical Concrete Specimens

5. ASTM C882 Standard Test Method for Bond Strength of Epoxy-Resin
Systems Used With Concrete By Slant Shear

6. ASTM C1244 Standard Test Method for Concrete Sewer Manholes by the
Negative Air Pressure (Vacuum) Test Prior to Backfill

7. ASTM D412 Standad Test Methods for Vulcaized Rubber and
Thermoplastic Elastomers — Tension

02800-1

1.05

10.

11.

12.

13.

14.

ASTM D624 Standard Test Method for Tear Strength of Conventional
Vulcanized Rubber and Thermoplastic Elastomers

ASTM D638 Standard Test Method for Tensile Properties of Plastics

ASTM D695 Standard Test Method for Compressive Properties of Rigid
Plastics

ASTM D790 Standard Test Methods for Flexural Properties of
Unreinforced and Reinforced Plastics and Electrical
Insulating Materials

ASTM D2240 Standard Test Method for Rubber Property — Durometer
Hardness

ASTM D4787 Standard Practice for Continuity Verification of Liquid or
Sheet Linings Applied to Concrete Substrates

ASTM D7234 Standard Test Method for Pull-Off Adhesion Strength of
Coatings on Concrete Using Portable Pull-Off Adhesion
Testers

SUBMITTALS:

Shop Drawings: The Contractor shall submit the following for the manhole rehabilitation
products in accordance with the requirements set forth in pertinent sections:

1.

2.

oOo oa FF WwW

Physical and chemical properties

Material composition

Confirmation of conformance to applicable reference standards
MSDSs

Warranty information

Instructions for installation and repair

Manufacturer’ s statement of compatibility between epoxy or polyurethane coating
and cementitious base coat

QUALIFICATIONS:

The qualifications of the aoparent low bidder shall be submitted no later than seven (7)
calenda’ days after the bid opening to the Engineer for evaluation prior to meking a
recommendation for award. These qualifications snall include detailed descriptions of the
following:

1.

Name, business address, and teleohone number of the Contractor

02800-2

2. Name(s) of all supervisory personnel that will be directly involved in the Project

3. Proposed product information showing compliance with the specified
requirements listed herein, including chimney seal, grout, and internal liner
material, and the respective manufacturer’ s installation instructions.

4. Documentation of certification of the Contractor, specialty technician, and/or
installer by the product manufacturer and/or its authorized representative

5. A reference list of previous projects on which the Contractor and/or installer has
renabilitated manholes over the last two years, including project nane, project
number, customer nane, owner's contact information (nane and phone number),
and the number of manholes rehabilitated

6. To be acceptable, the Contractor/installer must have had a minimum of 500
manhole rehabilitation product installations and a minimum of two (2) years of
active experience in the commercial installation of the products.

7. The Contractor shall sign and date the information provided and certify that, to the
extent of his knowledge, the information is true and accurate and that the
supervisory personne! will be directly involved with and used on the Project.
Substitutions of personnel and/or methods will not be allowed without prior
written authorization by the Owner and Engineer.

WARRANTY:

All rehabilitation systens, shall be warranted by the applicator and/or manufacturer
against failure for aminimum of two (2) years after acceptance by the Owner; in no case
shall the warranty be less than the manufacturer’ s published standard waranty period.

Failure will be deemed to have occurred if they fail to prevent groundwater infiltration or
prevent the internal deterioration or corrosion of the manhole. If any such failure occurs
within the warranty period, the damage shall be repaired by the Contractor in a manner
satisfactory to the Owner at no cost to the Owner within 60 days after written notification
of the failure.

PART 2 - PRODUCTS

2.01

A.

GENERAL:

The materials to be utilized in the rehabilitation of manholes shall be designed and
manufactured to withstand the corrosive effects of hydrogen sulfide in a wastewater
environment, prevent infiltration, aid withstand constant and direct contact with flowing
wastewater.

INTERNAL-LINER SYSTEM:

The internal liner system shall be specifically designed for a minimum service life of 50
years, to continuously bond to the substrate, to withstand a tenperature range of O degrees
to 100 degrees Fahrenheit, to restore the interior of the manhole, to withstand the
corrosive gases of domestic wastewater (especially hydrogen sulfide), to eliminate the

02800-3

infiltration of groundwater through the manhole walls and morta’ joints, and to be
structurally caoable of withstanding the pressure of groundwater based on the depth of the
specific manhole being lined.

The internal liner system shall be a multilayered polyurethane/polymeric stress skin panel
system, a 100 percent solids eooxy or polyurethane coating, or a composite systen
consisting of an esoxy or polyurethane top coat over a cementitious base coat. Infiltration
control, patching material, and/or a cementitious base coat may be necessary depending
on the extent of the manhole corrosion, damage, substrate profile, loss of material, and
infiltration. All materials used shall be completely compatible with al other manhole
rehabilitation products being used. Contractor shall ensure compatibility of all products
with the individual material manufacturers.

Where necessary, infiltration control and patching materials shall be installed in
accordance with the lining manufacturer's requirenents prior to installing the lining
system to control active infiltration and repair voids in the existing manhole walls or
damaged inverts. Infiltration control and patching materials shall be rapid-setting, high
early strength, hand-aoplied cementitious materials for stopping infiltrating water and
meking repairs to concrete, brick, or other masonry-constructed manholes. The materials
shall be non-shrinking, nonmetallic, and non-corrosive. The materials shall be compatible
with the lining material used. Infiltration control and patching materials shall be as
menufactured by The Strong Company, Inc., Raven Lining Systems, Madewell Products
Corporation, Quadex, Inc., or Engineer-approved equal.

Multilayered polyurethane/polymeric stress skin panel systen shall consist of a moisture
berrier, surfacer, and final corrosion barrier. Multilayeed pand systen shall be
SpectraSnield by CCI Spectrum, Inc. or Engineer-aoproved equal. Multilayered panel
system shall meet the following requirements at aminimum:

1. Shore A Hardness: 95 (per ASTM D2240)

2. Elongation: 300 percent (pe ASTM D412)

3. Tensile Strength: 2,400 psi (per ASTM D412)

4. Teer Strength: 500 pounds/linear inch (per ASTM D624)

5. Sheer Strength: 225 psi (per ASTM C273)

6. Finished Dry Thickness: 500 mils

7. Adhesion to Concrete: Substrate failure (per ASTM D7234)

Epoxy or polyurethane coating shall be high-build, snall be 100 percent solids, and shall
contain no volatile organic compounds. Coating shall be suitable for use as a trowel-
applied or spray-applied monolithic surfacing at the minimum dry film thickness specified

herein. Epoxy or polyurethane coating shall be Raven 405 by Raven Lining Systens,
Mainstay DS-5 by Madewell Products Corporation, SprayWall by Sprayrog, S-301 Epoxy

02800-4