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10.

B. Joints

Each standard pipe unit shall be clearly and permanently marked
with the nominal pipe size, the dimension ratio, the polyethylene
grade per ASTM D3350, a manufacturing standard reference e.g.
ASTM F 714, production code, date of manufacture, and
manufacturer’s trademark.

The Contractor and manufacturer shall exercise extreme care
during transportation, handling, storing, and installation of the
HDPE pipe to ensure that the pipe is not gouged or otherwise
damaged in any way. The Contractor shall store the pipe with a
cover to block ultraviolet light in accordance with the
manufacturer’s recommendations. If the HDPE pipe becomes
gouged or otherwise damaged, before or during installation, it shall
be replaced or repaired by the Contractor at no additional cost to
the Owner.

For segmental sliplining work the renewal pipe shall be 12”
nominal diameter DR17 IPS Threadliner HDPE pipe provided in
24” laying lengths as manufactured by ISCO Industries or
approved equal.

Lengths of polyethylene pipe and fittings for pneumatic hammer
assisted sliplining shall be joined by means of butt fusion.
Contractor shall engage trained personnel and utilize pipe
manufacturer's recommended equipment and techniques to join
lengths of pipe.

Lengths of polyethylene pipe and fittings for segmental sliplining
shall have a buttress style threaded connection, as provided by
ISCO Industries, or approved equal, externally wrapped with
electrofusion wire and welded, and shall be watertight when
tightened.

2.2. DESIGN CRITERIA

A. General

1.

All renewal pipe used to slipline existing pipelines shall be
designed for a minimum service life of 50 years. All renewal pipe
shall be designed to withstand the jacking or pulling forces, total
vertical and lateral loads, including, but not limited to, dead load,
live loads, and hydrostatic loads. Long-term, 50-year design shall
be based on the assumption that the existing carrier pipe provides

02769-7

no structural support to the renewal pipe, except for transmitting

loads.
2. Omitted.
B. Design Performance Limits and Design Parameters
1. The renewal pipe shall be designed such that the pipe shall not fail,

collapse, buckle, crack, or delaminate under loads. The maximum
long-term (50 years) calculated deflection under all loads shall not
exceed five percent (5%). The maximum bending strain (50 years)
developed in the wall shall not exceed three percent (3%) for

HDPE pipe.

C. The following parameters shall be used:
Depth of Cover Above Pipe Crown Actual
Depth of Groundwater Above Pipe Crown Ground Surface
Specific Weight of Soil 120 |bs./ft.
Wheel Load’ 16,000 Ibs.
Railroad Load” Not Applicable
Design Temperature 80°F
Shape Factor 4

Ovality Correction Factor

As applicable to pipe material for short-term
and long-term deflection

Deflection Lag Factor

1.0 (initial) 1.2 (50 years)

Modulus of Soil Reaction

1,200 psi

Short-Term Modulus of Elasticity

Seven (7) days under constant stress when
submerged in water, to be used for
unconstrained hydrostatic collapse resistance
design for highest external pressure resulting
from grout or groundwater above pipe.

Long-Term Modulus of Elasticity

50 years under constant stress when
submerged in water, to be used for
unconstrained buckling resistance design for
combined external loads from groundwater
and earth cover.

Minimum Factor of Safety

2.0, unless otherwise specified (not applicable
for maximum bending strain)

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Notes: ‘Design of the renewal pipe shall be based on prism load on the
renewal pipe, using the outside diameter of the renewal pipe in the
calculation.

“Impact factors to be included when depth of cover is less than 3 feet
per values recommended by AASHTO.

*Impact factors to be included when depth of cover is less than 10
feet per criteria established by AREA “Manual of Recommended
Practice”.

D. The minimum thickness of the pneumatically assisted slipline pipe to be
installed shall be as determined for the design conditions imposed.
Calculations for the determination of the required liner pipe stiffness or
DR shall be the largest pipe stiffness or smallest DR for each slipline pipe
installation reach (insertion pit to receiving pit), as determined by
calculations provided for the following parameters: (1) Maximum
Deflection; (2) minimum pipe stiffness or maximum DR; (3) ring bending
strain; (4) hydrostatic collapse resistance using short-term modulus of
elasticity, and (5) constrained buckling resistance using long-term
modulus of elasticity.

E. The Contractor shall submit test results with respect to the physical
characteristics of the pneumatically assisted slipline pipe. These tests shall
be at no additional cost to the Owner. These tests shall include the
following:

F. Tests for Tensile Strength of HDPE pipe material shall be in accordance
with ASTM D638. The minimum tensile strength shall be 3,100 psi.

1. Tests for the Determination of Environmental Stress Crack
Resistance (ESCR) shall be in accordance with ASTM F1248, with
an ESCR test equal to 2,000 hours.

PART 3 - EXECUTION
3.1 CONSTRUCTION PROCEDURE
A. Pneumatically assisted sliplining shall be performed with minimum
excavation and demolition of existing structures, and the Contractor shall re-
establish connections and minimize the disruptions to adjacent properties,

traffic, and wetlands. Excavation for point repairs or emergencies shall be
permitted, but only as approved by the Owner and permitting agencies.

02769-9

Prior to construction and delivery of materials, the Contractor shall obtain
the necessary permits and details or traffic flag persons, as appropriate.

1.

It is the intent of this contract that traffic be maintained at all times
in the areas of construction. The Contractor may be required to
halt operations and/or transport material to areas beyond immediate
work locations in order to allow minimum traffic disruptions.
Access to the site by emergency vehicles, school buses, and
residents shall be maintained at all times.

The Contractor shall submit a work plan to address the items specified
below, unless approved otherwise by the Owner.

1.

Safety - The Contractor shall carry out operations under this
Section in strict accordance with all applicable OSHA, State, and
local standards. Particular attention is drawn to those safety
requirements involving work with entry into a confined space. It
shall be the Contractor's responsibility to comply with OSHA and
NStar Electric’s standards and regulations pertaining to all aspects
of the work.

Pre-Installation Television Inspection - It shall be the responsibility
of the Contractor to video (TV) inspect the sewer pipe immediately
before pneumatically assisted sliplining, to assure that the existing
pipe conditions are acceptable for sliplining, and to locate all active
service line connections. This inspection, as well as the video
(TV) inspection after the installation, shall be paid for as per bid
item, or as directed by the Owner.

Cleaning - The Contractor shall clean the host pipe prior to
commencing pneumatically assisted sliplining operations. The
cleaning shall be sufficient to conduct pneumatically assisted
sliplining operations and to televise the host pipe to identify and
locate service connections. No additional compensation will be
made if the pipe is not sufficiently cleaned. The Contractor shall
be responsible for the proper transport and disposal of all debris
and material cleaned from the sewer.

Bypassing of Flows- When required for acceptable completion of
the pneumatically assisted sliplining, the Contractor shall provide
for continuous sewer and drainage flow around the section(s) of
pipe designated for the installation of renewal pipe. The pump
bypass lines shall be of adequate capacity and size to handle flow.

Sags in Line - If pre-installation video (TV) inspection reveals a
sag in the existing sewer that is greater than one-half the diameter

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of the existing pipe; it shall be the Contractor’s responsibility to
install the renewal pipe to result in an acceptable grade without the
sag. The Contractor shall take in necessary measures to eliminate
these sags, as approved by the Owner by pipe renewal; digging a
sag elimination pit and bringing the bottom of the pipe trench to a
uniform grade in line with the existing pipe invert or by other
measures that shall be acceptable to the Owner.

Point Repairs - Point repairs are repairs to the existing pipeline
required prior to renewal work. Point repairs shall be located
during the internal inspection of the pipeline. The Contractor shall
repair areas requiring “point repair’ after cleaning and pre-
construction internal inspection is complete and prior to
commencement of renewal work. Contractor shall submit to the
Owner the proposed method(s) of point repair for each area
requiring a point repair for review and approval. Point repairs also
include the joint and pipe infiltration which may affect the
pneumatically assisted sliplining. The Contractor shall notify the
Owner not less than 48 hours in advance of making any particular
point repair. Work shall include supplying necessary materials,
equipment, excavation, sewage diversion in bypassing, dewatering,
and labor.

3.2 INSERTION PITS

A.

Prior to commencing any excavation, Contractor shall submit a detailed
Plan of Construction to identify the location and number of all proposed
insertion pits to the Owner for review. The pits shall be spaced in
conformance with the Liner Pipe Manufacturer's recommended maximum
allowable insertion force that can be exerted onto the liner pipe.

The Contractor shall locate access shafts or insertion pit(s) as shown on
the drawings. The use of additional pits or different locations, as shown,
must be approved, in writing, by the Engineer prior to construction.
Receiving pit locations are not shown on the drawings. Receiving pits
shall be located at manholes or structures only and no excavation shall be
allowed unless a new manhole is designated on the Drawings or as
otherwise approved in writing by the Engineer. Access for receiving pits
shall be through existing manholes or structures. All insertion or
receiving pits shall be designed to be constructed with wood or steel
sheeting, steel plates or steel trench boxes. Shafts or pits shall be
designed in conformance with Section 02210 - Earthwork.

The size of access/receiving shafts shall be as small as possible but
sufficient to allow access for the Contractor's work. The Contractor is

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responsible for dewatering of each shaft. The shaft(s) shall be removed
and backfilled as soon as practical upon completion of the liner pipe and
the surface restored in accordance with the applicable provisions of these
specifications.

The Contractor shall minimize the time that a shaft remains open at a
particular site. Considerations shall be provided to complete and
coordinate all work including cleaning, pre-installation internal
inspection, pipe renewal, post-installation internal inspection and
acceptance so as to minimize disturbances. The Contractor shall
recognize that shafts shall not be removed/closed until the renewal pipe
has been internally inspected and accepted by the Engineer and it is
intended that each shaft shall be removed/closed and backfilled within
two calendar days from completion of the pipeline renewal work and
service reconnections.

3.3 INSTALLATION PROCEDURES

A.

Prior to pneumatically assisted sliplining pipe installation, the Contractor
shall insert a length of liner pipe test section to ensure that the existing
pipe is free of obstructions. The test section shall have an outside
diameter equal to or approximating the maximum allowable tolerance for
each reach and class of liner pipe and a length equal to that of the proposed
liner pipe for each reach of pipeline to be sliplined. The test section may
be left in place, provided it is not damaged and it meets design basis for
pipe reach. A new pipe section shall be provided at no additional cost, if
the Owner considers the test section damaged, worn, or not representative
of the actual liner pipe to be installed.

1. In the event the test section fails to pass through a reach, the
Contractor shall, at no additional cost to the Owner, use a shorter
test section(s) to determine if shorter lengths of liner pipe can be
successfully installed; provide for sliplining in the opposite
direction with a joint match at the point of obstruction; relocate an
access shaft or pit, with the approval of the Owner, to complete the
sliplining operation; and/or other means with prior approval by the
Owner.

2. Upon successful completion of the insertion of the test section, the
existing host pipe shall be considered ready to receive the liner
pipe and commencement of the pneumatically assisted sliplining
operation. The proposed liner pipe shall be lowered down into the
insertion pit and inserted into the existing host pipe. The
Contractor shall submit details for the pushing or pulling head to
be used, including the maximum allowable pushing or pulling

02769-12

9/22/2016 PROPOSED AMENDMENTS TO R-16-068

RESOLUTION

AFFIRMING THE CITY OF NASHUA, NEW HAMPSHIRE AS A WELCOMING CITY
AND TO PARTICIPATE IN THE WELCOMING AMERICA INITIATIVE

CITY OF NASHUA

In the Year Two Thousand and Sixteen

WHEREAS, fostering a welcoming environment for all individuals, regardless of race,
ethnicity or place of origin, enhances Nashua’s cultural fabric, economic growth, global
competitiveness and overall prosperity for current and future generations;

WHEREAS, Nashua has long been recognized as a hospitable and welcoming place
where individuals, families and institutions thrive and the contributions of all are celebrated and
valued;

WHEREAS, Nashua is committed to continue building a welcoming and neighborly
atmosphere in our community, where all people including immigrant newcomers are welcome,
accepted and integrated; and to encourage all residents of Nashua to do their part in reaching out
and welcoming all who live, work and visit Nashua;

WHEREAS, community efforts that promote understanding and collaboration between
long-time residents and foreign born community members are crucial in encouraging and
ensuring a welcoming environment;

WHEREAS, Nashua encourages its business leaders, civic groups, other government
agencies and community institutions and residents to join in a community-wide effort to expand
prosperity and inclusion for all residents by implementing policies and practices that promote
understanding and an appreciation of diversity; and

WHEREAS, the cities of Manchester and Concord are both Welcoming Cities, and
Welcoming Week, an annual series of events to connect neighbors and serve communities, is
September 16 - 25, 2016.

NOW THEREFORE, BE IT RESOLVED by the Board of Aldermen of the City of
Nashua that the Mayor and the Board of Aldermen of the City of Nashua recognize and affirm
the City of Nashua, New Hampshire as a Welcoming City to reinforce that all are welcome in
Nashua and participate in the Welcoming America Initiative by executing the attached
“Commitment to Participate in the Welcoming Cities & Counties Cohort”, which sets forth the
City’s role under the Welcoming America Initiative.

AGREEMENT

THIS AGREEMENT, made this day of , 20 by and between The City of Nashua, New Hampshire,
hereinafter called “OWNER” and Insituform Technologies, LLC doing business as Limited Liability (an individual, a partnership
ora corporation) hereinafter called “CONTRACTOR”.

WITNESSETH: That for and in consideration of the payments and agreements hereinafter mentioned:

1.
2.

3.

5.

The CONTRACTOR will commence and complete the construction of Siphons Rehabilitation Project (“PROJECT”).
The CONTRACTOR will furnish all of the material, supplies, tools, equipment, labor and other services necessary
for the construction and completion of the PROJECT described herein.

The CONTRACTOR will commence the work required by the CONTRACT DOCUMENTS within 30 calendar days
after the date of the NOTICE TO PROCEED unless the period for completion is extended otherwise by the
CONTRACT DOCUMENTS. Completion time for the project will be calculated as calendar days from the date
specified in the NOTICE TO PROCEED as follows:

182 calendar days for substantial completion.

212 calendar days for final completion.

Liquidated damages will be in the amount of $1,500.00 for each calendar day of delay from the date established
for the substantial completion and $1,500.00 for each calendar day of delay from the date established for final
completion.
The CONTRACTOR agrees to perform all of the WORK described in the CONTRACT DOCUMENTS and comply with
the terms therein for the sum of One Million One Hundred Seventy-Three Thousand Dollars ($1,173,000) as
shown in the BID schedule.
The term "CONTRACT DOCUMENTS" means and includes the following:

a. ADVERTISEMENT FOR BIDS

b. INFORMATION FOR BIDDERS

BID

BID BOND

NOTICE OF AWARD

AGREEMENT

PAYMENT BOND

PERFORMANCE BOND

i. CERTIFICATE OF INSURANCE

j. NOTICE TO PROCEED

k. CHANGE ORDER(S)

|. CERTIFICATON OF SUBSTANTIAL COMPLETION
m. CERTIFICATION OF FINAL COMPLETION

n. CONTRACTOR'S AFFIDAVIT

o. CONTRACTOR'S RELEASE
p
q
r

> * oO 2 9

GENERAL CONDITIONS

SUPPLEMENTAL GENERAL CONDITIONS

SPECIAL CONDITIONS
s. DRAWINGS prepared by: Hazen and Sawyer numbered G-01 through TC-01 and dated June 9, 2022.
t. SPECIFICATIONS prepared or issued by: Hazen and Sawyer and dated June 9, 2022.

Page 3 of 15

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