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10.

11.

12.

Before butt fusing pipe, inspect each length for presence of dirt, sand,
mud, shavings, and other debris or animals. Remove debris from pipe.

Cover open ends of fused pipe at end of each working day. Cap to
prevent entry by animals or debris.

Use compatible fusion techniques when PEs of different melt indexes are
fused together. Refer to manufacturer’s specifications for compatible
fusion.
Fusion welding shall not be performed when pipe ends are exposed to
precipitation. CONTRACTOR shall provide temporary welding shelter if
necessary.
All HDPE cuttings from pipe facing and drilling shall be removed from the
pipe network by CONTRACTOR prior to turning the Project over to
OWNER. CONTRACTOR shall clean the entire pipe network associated
with the Project if HDPE cuttings are encountered in the pipe network by
OWNER following completion of the project.
All interior butt-fusion weld beads shall be removed from the pipe
ie., all HDPE pipe must be de-beaded) in accordance with the
manufacturer's recommendations.

C. Flange Jointing

1.
2.

3.
4,

Use on flanged pipe connection sections.

Connect slip-on carbon steel backup flanges with galvanized nuts and

bolts.

Butt fuse fabricated flange adapters to pipe.

Observe the following precautions in connection of flange joints.

a. All fasteners and back-up rings shall be carbon steel below grade,
and zinc-plated steel above grade.

b. Align flanges or flange/valve connections to provide tight seal.
Require nitrile-butadiene gaskets if needed to achieve seal. Gaskets
are required for flange/valve connections.

c. U.S. Standard round washers as may be required on some flanges in
accordance with manufacturer’s recommendations. Bolts shall be
lubricated in accordance with manufacturer's recommendations.

d. Tighten flange bolts using a torque wrench in sequence and
accordance with manufacturer’s recommendations. CAUTION: Do
not over-torque bolts. CONTRACTOR shall use a torque wrench to
tighten all flange fasteners.

Pull bolts down by degrees to uniform torque in accordance with

manufacturer's recommendation.

Protect below grade bolts and flanges by covering with a 6-mil thick PE

wrap. Duct tape wrap to HDPE pipe.

Electrofusion couplers, where used, shall be installed per manufacturer’s

specifications. The outside diameter of the HDPE pipe and face shall be

File No. 3066.09

High-Density Polyethylene Pipe 15210 - 8 of 13 December 2017

prepared in accordance with manufacturer’s recommendations prior to
installing the coupler.

D. Pipe Placement

1.

2.
3.

a

™

10.
11.

12.

13.

Grade control] equipment shall be of type to accurately maintain design
grades and slopes during installation of pipe.

Remove all standing water in trench before pipe installation.

Unless otherwise specifically stated, install pipe in accordance with
manufacturer’s recommendations.

Maximum lengths of fused pipe to be handled as one section shall not
exceed 400 feet and shall be placed according to manufacturer’s
recommendations as to pipe size, pipe SDR, and topography so as not to
cause excessive gouging or surface abrasion. Pipe wall gouges deeper
than 3/16-inch shall be cause for rejection of the pipe.

Cap pipe sections longer than single joining (usually 40 feet) on both ends
during placement except during fusing operations.

Remove dirt or debris from inside of pipe before backfilling.

Notify ENGINEER prior to installing pipe into trench and allow time for
ENGINEER’s inspection.

Correct irregularities found during inspection.

Complete connections within trench whenever possible to prevent
overstressed connections.

Allow pipe sufficient time to adjust to trench temperature prior to testing,
segment tie-ins, or backfilling activity.

Install reducers adjacent to laterals and tees.

To reduce branch saddle stress, install saddles at slope equal to and
continuous with lateral piping.

Place in trench by allowing minimum 12 inches/100 feet for thermal
contraction and expansion.

Coordinate construction of pipes near/in access roads with OWNER to
limit impediment of OWNER’s operations or operations of other
contractors.

3.3. PIPE TESTING

A. General

1.

2.

The Contractor shall perform hydrostatic pressure tests after placement
in trench, in accordance with these specifications.

The total test time, including initial pressurization, initial expansion, and
time at test pressure shall not exceed eight hours. If the test is not
completed in eight hours, the pressure in the test section shall be
released and the section allowed to “relax” for at least eight hours before
initiating another test.

File No. 3066.09

High-Density Polyethylene Pipe 15210 - 9 of 13 December 2017

ut

9.

Pipe lines shall be pressure tested in presence of the CQA Consultant.
CONTRACTOR to provide ENGINEER with a minimum of 7 days’ notice
before performing the test.

Provide necessary connections between section of pipe being tested and
nearest available source of water or air supply, together with test
pressure equipment, meters, pressure gauge, other equipment, materials
and facilities necessary to make specified tests.

Owner will provide a source of water for testing.

Provide bulkheads, flanges, valves, bracing, blocking, or other temporary
sectionalizing devices as required to perform the tests safely.

Pipe to be tested shall be exposed in the trench, except that bends,
reduced pressure rated fittings and components should be buried or
restrained. Flange connections shall be visible to check for leaks.
Contractor shall notify on-site personnel of the testing schedule, and only
allow personnel required to perform the test in the test area for the
duration of the test.

Contractor shall provide a system without leaks.

B. Test all non-perforated HDPE leachate force main pipe and fittings. Test all
PVC pipe in the Sump Riser Building, installed in accordance with specification
section 15212 and 15310, using this procedure as well.

C. Preparation

1.

Remove or isolate valves, flow meters, and instruments that may not
withstand the required test pressure from within the test sections.
Reconnect pipes with temporary fittings. Vent isolated equipment.

Flush pipe with clean water until pipe section to be tested is clean and
free of dirt, sand, pipe shavings, or other foreign material.

Plug pipe outlets with test plugs, blind flanges or other devices suitable
for the test pressure. Brace securely to prevent blowouts. Verify test
pressure does not exceed any component of the pipe system.

Restrain or remove expansion joints.

Pressurizing equipment shall include a pressure regulator, set to avoid
over-pressurizing and damaging otherwise acceptable pipe.

D. Hydrostatic Pressure Testing

1.

2.
3.

Contractor shall use a hydrostatic test pump specifically designed for
performing hydrostatic pressure tests on pipe.

Clean potable water shall be used as the testing medium to fill the pipes.
Pipe shall be tested at 1.5 times the rated working pressure of the pipe or
the lowest rated pressure of any component of the system being tested.
In no case exceed maximum allowable pressure for any pipeline
component, including valves, fittings, and instruments.

File No. 3066.09

High-Density Polyethylene Pipe 15210 - 10 of 13 December 2017

8.

9.

Apply test pressure slowly, and once the test pressure has been reached,
allow the pressure to stabilize, without adding additional pressure. This
may take 2 to 3 hours.

Once pressure has stabilized, add additional water to achieve the test
pressure and begin the test.

After 1 hour, additional water shall be added to return to the test
pressure. If the volume of water required to achieve the test pressure
after 1 hour is less than shown in the table, then the pipe has passed the
pressure test.

The total test time, including the initial pressurization, initial expansion
and time at test pressure, shall not exceed eight hours. If the test is not
completed within that time, the test pressure shall be removed for at least
eight hours, prior to performing the test again.

If pressure test is not accepted, correct leaks or defects in the pipe and
retest.

Remove temporary sectionalizing devices after tests are complete.

E. Test Report

1.

2.

Pressure testing shall be documented using the test log provided as
Attachment 1 to this Specification.

CQA Consultant shall record the following information for each test.
Date of test.

Description and identification of piping system tested.

Type of test performed.

Test fluid.

Test pressure.

Results of test.

Type and location of leaks detected.

Corrective action taken to repair leaks.

Results of retesting.

Name of person performing test.

Tore me ae op

[END OF SECTION 15210]

P:\3000s\3066.09\Source Files\Type II App\Specifications\ Division 15 Specifications\15210 HDPE.docx

File No. 3066.09

High-Density Polyethylene Pipe 15210 - 11 of 13 December 2017

ATTACHMENT 1 TO SECTION 15210
HYDROSTATIC PIPE PRESSURE TEST LOG

Project No.:
Project Name:
SANBORN ||| HEAD , ,
- ; Project Location:
Building Trust. Engineering Succe.
Weather
Contractor: Test No.

Sanborn Head Personnel:

Person/Company Performing the Test:

Date of Test: Time of Test: Start: Finish:
Pipe Length: ft. Pipe Diameter: in. Pipe Material: Pipe SDR/Sch.::
Rated Working Pressure: Test Pressure:

Location/designation of pipe tested:

t Pe Pc Amount of
Time Pressure Gauge Pressure Make-Up Water Added
(hours) Reading Dro 1
(psig) (0) (gal.)
0
1
2
3
4
5
6
Pass Fail Retest? Yes No

Description/location of defects for failed test:

Test Procedure:

nf WNP

. Pressurize to 150 percent of rated pressure;
. Add make-up water each hour for three hours to maintain pressure;
. Test phase begins after the initial three-hour phase;
. After one, two or three hours add a measured amount of makeup water to return to the test pressure; and

. The amount of makeup water added to return to the test pressure must not exceed the amount in the

makeup water test values table on the back of this sheet.

Comments:

Signature:

File No. 3066.09

HDPE Pipe, Fittings, and Appurtenances 15210 - 12 of 13 December 2017

MAXIMUM ALLOWABLE MAKE-UP WATER VOLUME

Nominal Pipe Size Make-Up Water Allowance
(inches) (U.S. Gallons per 100 ft. of Pipe)
1 Hour Test 2 Hour Test 3 Hour Test
1-1/4 0.06 0.10 0.16
1-1/2 0.07 0.10 0.17
2 0.07 0.11 0.19
3 0.10 0.15 0.25
4 0.13 0.25 0.40
5 0.19 0.38 0.58
5-3/8 0.21 0.41 0.62
6 0.3 0.6 0.9
7-1/8 0.4 0.7 1.0
8 0.5 1.0 1.5
10 0.8 1.3 2.1
12 1.1 2.3 3.4
13-3/8 1.2 2.5 3.7
14 1.4 2.8 4.2
16 1.7 3.3 5.0
18 2.0 4.3 6.5
20 2.8 5.5 8.0
22 3.5 7.0 10.5
24 4.5 8.9 13.3
26 5.0 10.0 15.0
28 5.5 11.1 16.8
30 6.3 12.7 19.2
32 7.0 14.3 21.5
34 8.0 16.2 24.3
36 9.0 18.0 27.0
42 12.0 23.1 35.3
48 15.0 27.0 43.0
54 18.5 31.4 51.7

File No. 3066.09 HDPE Pipe, Fittings, and Appurtenances 15210 - 13 of 13 December 2017

EXHIBIT B

=
vhb Final Design Services for Downtown Riverfront Implementation

AMMENDMENT FOR PROFESSIONAL SERVICES
BETWEEN
VANASSE HANGEN BRUSTLIN, INC.
AND
THE CITY OF NASHUA, NEW HAMPSHIRE

DOWNTOWN RIVERFRONT PROJECT
June 9, 2022

The following amends the April 27,2022 Contract between VHB and the City of Nashua for
the above project This Contract Amendment is comprised of

the scope of services described herein and the compensation as detailed in the attached
spreadsheets. This amendment is subject to the Terms and Conditions of the original Agreement.

SCOPE OF SERVICES

This contract amendment specifically covers the final design of improvements along Water
Street as depicted on preliminary design plans dated March 30, 2022. The construction will
include minor roadway and sidewalk geometric modifications, pavement milling and overlay and
new pavement markings and signs to convert Water Street to one-way westbound as approved
by the City. Parallel parking spaces will also be added on the north side of Factory Street. The
work on Water Street will begin at Main Street and end at Factory Street. Minor drainage work is
anticipated to include adding catch basins to collect roadway runoff that would be trapped by
the planned curb extensions. The basins will connect to the existing roadway drainage system.
No system upgrades are included. The work will also include removing traffic signal heads on
Main Street that face the Water Street approach since the road will become one-way away from
Main Street. It is assumed the work will include modifying the existing bridge rail on the north
side of Water Street such that it is pedestrian safe where sidewalk will be added and possibly
beyond if the City expects to close the street for pedestrian events. No work is planned for the
Water Street bridge under this contract and no utility pole relocations are anticipated or
included. No additional traffic analysis is included.

PHASE 3 - FINAL DESIGN

The final design phase will include refinement of the preliminary design. This will include
developing construction plans and specifications for use by the City’s Construction Management
(CM) firm in bringing the project to construction. The following is a description of VHB's Phase 3
scope of work for the above referenced effort.

SECTION 15212

POLYVINYL CHLORIDE (PVC) PIPE, VALVES, AND FITTINGS

PART 1 - GENERAL

1.1

1.2

1.3

SCOPE OF WORK

A. CONTRACTOR shall provide all labor, materials, tools, and equipment, and
perform all operations necessary to furnish and install the polyvinyl chloride
(PVC) pipe and fittings as specified herein and as shown on the Drawings or as
required by ENGINEER or OWNER.

SUBMITTALS

A. CONTRACTOR shall submit manufacturer's technical product data that meets
the requirements of this Section, and the installation instructions for PVC pipe
and fittings, to ENGINNER prior to delivery of PVC pipe to the site.

MATERIALS STORAGE AND HANDLING

A. CONTRACTOR shall be responsible for the handling, storage, and care of the
PVC pipe from the time of delivery to the site until final acceptance of the
completed Work by OWNER. CONTRACTOR shall be liable for all damages to
the materials during such time.

PART 2 - PRODUCTS

2.1

PIPE AND FITTINGS

A. Pipe and fittings shall be manufactured from a PVC compound that meets the
requirements of Cell Classification 12454-B polyvinyl chloride as outlined in
ASTM D1784. Pipe and fittings materials shall be specially formulated with
sufficient ultraviolet screeners to provide for longer term outdoor exposure
with no deleterious effects.

B. PVC pipe used in the construction of leachate conveyance and control systems
shall meet the requirements of ASTM D1784 and ASTM D1785.

C. PVC fittings used in the construction of leachate collection and control systems
shall meet the requirements of ASTM D2464 and ASTM D2467.

D. All PVC cements shall meet the requirements of ASTM D2564.
E. Clean rework or recycle material generated by the manufacturer’s own

production may be used so long as the pipe or fittings produced meet all the
requirements of this Section.

File No. 3066.09 Polyvinyl Chloride (PVC) Pipe, Valves, and Fittings 15212- 1 of 3 December 2017

F, Fittings shall be industrial, heavy duty, hub style.

G. Socket fittings shall be pressure rated the same as the corresponding size pipe
prescribed by ASTM D1785. Threaded fittings shall be pressure rated to at
least 150 percent of the rating for socket fittings.

2.3. VALVES

A. Valves shall be flanged Type 21/21A PVC ball valves, manufactured by
Asahi/America, or approved equal, of the size indicated on the Drawings.

B. Valves shall be constructed with the following materials:

1. Body - polyvinylchloride (PVC)

2. Seats - polytetrafluoroethylene (PTFE), backed with fluorocarbon rubber
(FKM)

3. Seals - FKM

PART 3 - EXECUTION

3.1 PVC PIPE HANDLING

A.

PVC pipe and pipe fittings shall be handled carefully in loading and unloading.
They shall be lifted by hoists and lowered on skidways in such a manner as to
avoid shock. Pipe and pipe fittings shall not be dropped or dumped.

3.2 PVC PIPE INSTALLATION

A.

PVC pipe installation shall conform to the requirements of this Section, the
manufacturer’s recommendations, and as outlined in ASTM D2774V.

3.3. JOINING OF PVC PIPES

A.

B.

Pipes shall be joined in accordance with ASTM D2855.

All pipe shall be inspected for cuts, scratches, or other damages prior to
installation. Pipe with imperfections shall not be used.

All burrs, chips, etc., shall be removed from pipe interior and exterior.

All loose dirt and moisture shall be wiped from the interior and exterior of the
pipe end and the interior of the fitting.

All pipe cuts shall be square and perpendicular to the center line of pipe.

Pipe ends shall be beveled prior to applying primer and solvent cement so that
the cement does not get wiped off during insertion into the fitting socket.

File No. 3066.09 Polyvinyl Chloride (PVC) Pipe, Valves, and Fittings 15212- 2 of 3 December 2017

G. Acoating of CPS primer, as recommended by pipe supplier, shall be applied to
the entire interior surface of the fitting socket, and to an equivalent area on the
exterior of the pipe prior to applying solvent cement.

H. The solvent cement shall comply with the requirements of ASTM D2564 and
shall be applied in strict accordance with manufacturer’s specifications.

I. Pipe shall not be primed or solvent welded when it is raining, or when
atmospheric temperature is below 40°F, or above 90°F when under direct
exposure to the sun.

J. After solvent welding, the pipe shall remain undisturbed until cement has
reached initial set. As a guideline for joint setting time, use 1 hour for ambient
temperatures between 60°F and 100°F, or 2 hours when ambient temperature
is between 40°F and 60°F.

K. Pipe and pipe fittings shall be selected so that there will be as small a deviation
as possible at the joints, and so that inverts present a smooth surface. Pipe and
fittings that do not fit together to form a tight fitting shall be rejected.

[END OF SECTION 15212]

P:\3000s\3066.09\Source Files\Type II App\Specifications\ Division 15 Specifications\15212 PVC.docx

File No. 3066.09 Polyvinyl Chloride (PVC) Pipe, Valves, and Fittings 15212- 3 of 3 December 2017