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All CCTV video files shall be identified by street names, manhole designations, pipe
diameter, length, date work was performed, labeled “City of Nashua”, contract number
and sub area designation.

END OF SECTION

2019 Sewer Replacement Project Documentation
Nashua, NH 01331-2

SECTION 01735

CUTTING, CORING AND PATCHING

PART 1 - GENERAL
1.01 WORK INCLUDED:

This Section covers the cutting, coring, rough and finish patching of holes and openings in
existing structures.

PART 2 - PRODUCTS
2.01 SEALING MATERIALS:

A. Mechanical seals shall be modular, adjustable, bolted, mechanical type consisting of
interlocking synthetic rubber links shaped to continuously fill the annular space between the
pipe and sleeve. The seal shall be rated by the manufacturer for 40 feet of head or 20 psig.
Mechanical seals shall be Link-Seal, manufactured by Thunderline Corp., Wayne, ML, or
approved equal.

B. — Sealant shall be a two part foamed silicone elastomer as manufactured by Dow Corning
Co., product No. 3-6548 silicone R.T.V.; 3M brand fire barrier products caulk C.P. 25 and
3M brand putty 303; Flame-Safe fire stop systems Fig. No. FS-500 by Thomas & Berts
Corporation, or approved equal. Packing shall be a fire retardant pliable material, Fig. 310 by
Sealtite Co.; White Oakum W.S.-600 by American Manufacturing Co., or approved equal.
Sealant bead configuration, depth and width shall be in accordance with manufacturer's
recommendations.

2.02 MISCELLANEOUS MATERIALS:

A. Bonding compound shall be Sikadur Hi-Mod epoxy by Sika Corporation, or equivalent by
Euclid Chemical Corporation, Master Builders Company, or approved equal.

B. Non-shrink grout shall be Masterflow 713 by Master Builders Company; Euco N-S by
Euclid Chemical Co.; Five Star Grout by U.S. Grout Corp. or approved equal.

C. Materials for finish patching shall be equal to those of adjacent construction.
PART 3 — EXECUTION
3.01 GENERAL:

A. The Contractor shall leave all chases or openings for the installation of his own or any
other contractor's or subcontractor's work, or shall cut the same in existing work, and shall see

2019 Sewer Replacement Project Cutting, Coring and Patching
Nashua, NH 01330-1

B.

3.02

3.03

A.

that all sleeves or forms are at the work and properly set in ample time to prevent delays.
He shall see that all such chases, openings, and sleeves are located accurately and are of proper
size and shape and shall consult with the Engineer and the contractors and subcontractors
concemed in reference to this work.

In case of his failure to leave or cut all such openings or have all such sleeves provided and set in
proper time, Contractor shall cut them or set them afterwards at his own expense, but in so doing
he shall confine the cutting to the smallest extent possible consistent with the work to be done.
In no case shall piers or structural members be cut without the written consent of the Engineer.

The Contractor shall not cut or alter the work of any subcontractor or any other contractor, nor
permit any of his subcontractors to cut or alter the work of any other contractor or
subcontractor, except with the written consent of the contractor or subcontractor whose work is
to be cut or altered or with the written consent of the Engineer. All cutting and patching or
repairing made necessary by the negligence, carelessness, or incompetence of the Contractor or
any of his subcontractors shall be done by or at the expense of the Contractor and shall be
the responsibility of the Contractor.

All cutting and coring shall be performed in such a manner as to limit the extent of
patching.

All holes cut through concrete and masonry walls, slabs or arches shall be core drilled unless
otherwise approved. No structural members shall be cut without the approval of the Engineer and
all such cutting shall be done in a manner directed by him. No holes may be drilled in beams or
other structural members without obtaining prior approval. All work shall be performed by
mechanics skilled in this type of work.

CORING:
Coring shall be performed with an approved non-impact rotary tool with diamond core drills.
Size of holes shall be suitable for pipe, conduit, sleeves, equipment or mechanical seals to be
installed.
If holes are cored through floor slabs they shall be drilled from below.

All equipment shall conform to OSHA standards and specifications pertaining to plugs, noise
and fume pollution, wiring and maintenance.

Provide protection for existing equipment, utilities and critical areas against water or other damage
caused by drilling operation.

Slurry or tailings resulting from coring operations shall be vacuumed or otherwise removed from the
area following drilling.

CUTTING:

Cutting shall be performed with a concrete wall saw and diamond saw blades of proper size.

2019 Sewer Replacement Project Cutting, Coring and Patching
Nashua, NH 01330-2

B. Provide for control of slurry generated by sawing operation on both sides of wall.

C. When cutting a reinforced concrete wall, the cutting shall be done so as not to damage bond between
the concrete and reinforcing steel left in the structure. Cut shall be made so that steel neither
protrudes nor is recessed from the face of the cut.

D. Adequate bracing of area to be cut shall be installed prior to start of cutting. Check area during
sawing operations for partial cracking and provide additional bracing as required to prevent a
partial release of cut area during sawing operations.

E. Provide equipment of adequate size to remove cut panel.

3.04 PATCHING:

Rough patching shall be such as to bring the cut or cored area flush with existing
construction unless otherwise shown. Finish patching shall match existing surfaces as

approved.
END OF SECTION

2019 Sewer Replacement Project Cutting, Coring and Patching
Nashua, NH 01330-3

SECTION 02085

POLYVINYL CHLORIDE GRAVITY PIPE AND FITTINGS

PART 1 -GENERAL

1.01 WORK INCLUDED:
This section covers the furnishing and installation of Polyvinyl Chloride (PVC) pipe and
fittings for sewer mains, sewer service connections and drain laterals to catch basins, as
indicated on the drawings and as specified herein.

RELATED WORK:

Section 01330, SUBMITTALS

Section 02300, EARTHWORK

Section 02252, SUPPORT OF EXCAVATION

vo wp > 8

Section 02518, TRACER TAPE

E. Section 02631, PRECAST MANHOLES AND CATCH BASINS
1.03 REFERENCES:
A. The following standards form a part of these specifications as referenced:
American Society for Testing and Materials (ASTM)

ASTM — D2321 Recommended Practice for Underground Installation of Flexible
Thermoplastic Sewer Pipe

ASTM _D3034 Specification for Type PSM Polyvinyl Chloride (PVC) Sewer
Pipe
and Fittings

ASTM = _D3212_—_s Specification for Joints for Drain and Sewer Plastic Pipes Using
Flexible Elastomeric Seals

ASTM _ F679 Specification for Polyvinyl Chloride (PVC) Large Diameter
Plastic Gravity Sewer Pipe and Fittings (18"- 27")

The National Association of Sewer Service Companies (NASSCO) Recommended
Specifications for Sewer Collection System Rehabilitation (Current Edition).

2019 Sewer Replacement Project Polyvinyl Chloride Gravity Pipe and Fittings
Nashua, NH 02085-1

B. | New Hampshire Code of Administrative Rules, Env-Wq 704, Design of Sewerage.

1.04 SUBMITTALS:
In accordance with requirements of the General Specifications submit six (6) sets of

manufacturer's literature of the materials of this section shall be submitted to the Engineer for
review.

PART 2 - PRODUCTS

2.01 MATERIALS:

A. PVC NON-PRESSURE SEWER PIPE:

PVC non-pressure sewer pipe 4-inches through 15-inches diameter (SDR-35) shall be solid
wall and conform to ASTM - D3034. PVC non-pressure pipe 18-inches through 60-inches
diameter (T-1 & T-2) shall be solid wall and conform to ASTM F679. All pipe shall be as
specified and meet the following requirements.

1. PVC non-pressure sewer pipe shall be furnished in standard lengths.

2. One pipe bell consisting of an integral wall section with a solid cross section rubber ring, factory
assembled, shall be furnished with each standard, random and short length of pipe. Rubber rings
shall be provided to the requirements of ASTM D3212.

3. The rubber ring shall be retained within the bell of the pipe by a precision formed groove
or recess designed to resist fish-mouthing or creeping during assembly of joints.

4. Spigot pipe ends shall be supplied with bevels from the manufacturer to ensure proper insertion.
Each spigot end shall have an "assembly stripe" imprinted thereon to which the bell end of the
mated pipe will extend upon proper jointing of the two pipes.

5. PVC fittings shall be provided with bell and/or spigot configurations with rubber gasketed joints
compatible with that of the pipe. Bend fittings with spigot ends shorter than the pipe recess bells
will not be allowed. The shorter spigot end would not allow proper seating of the spigot in the
mating bell and would permit undesired contact between the mating bell and the outside of
the fitting bell.

6. A\ll pipe delivered to the job site shall be accompanied by independent testing laboratory
reports certifying that the pipe and fittings conform to the above-mentioned specifications. In
addition, the pipe shall be subject to thorough inspection and tests, the right being

reserved for the Engineer to apply such of the tests specified as he may from time to time
deem necessary.

7. All cutting of pipe shall be done with a machine suitable for cutting PVC pipe. Cut ends shall be
beveled when recommended by the pipe manufacturer.

8. All couplings for connecting pipes of various sizes shall be FERNCO STRONGBACK.

2019 Sewer Replacement Project Polyvinyl Chloride Gravity Pipe and Fittings
Nashua, NH 02085-2

flexible repair couplings, or approved equal, of the appropriate size to fit the external diameter
of each pipe.

SEWER AND DRAIN PIPE BEDDING AND SAND BLANKET:
Sewer pipe bedding and sand blanket shall be as specified in Section 02300 EARTHWORK.
DUCTILE IRON PIPE:

Ductile iron pipe shall be used at sewer/water line crossings and conform to AWWA
C151/A21.50 & 51, Class 52.

PART 3 - EXECUTION

3.01

A.

INSTALLATION:

Except as modified herein, installation of the PVC pipe shall be in accordance with ASTM
D2321.

Each pipe length shall be inspected before being laid to verify that it is not cracked. Pipe shall be
laid to conform to the lines and grades indicated on the drawings or given by the Engineer. Each
pipe shall be so laid as to form a close joint with the next adjoining pipe and bring the inverts
continuously to the required grade.

The pipe shall be bedded and covered with sand blanket as specified under Section 02300,
EARTHWORK, and as detailed on the project plans.

The pipe shall not be driven down to grade by striking it with a shovel handle, timber, rammer, or
other unyielding object. When each pipe has been properly bedded, enough of the backfill
material shall be placed and compacted between the pipe and the sides of the trench to hold the
pipe in correct alignment.

Before a joint is made, the pipe shall be checked to assure that a close joint with the next
adjoining pipe has been maintained and that inverts are matched and conform to the required line

and grade.

For pipe placed on crushed stone, immediately after the joint is made, the jointing area shall be
filled with suitable materials so placed and compacted that the ends of either pipe will not settle
under backfill load.

No pipe or fitting shall be permanently supported on saddles, blocking, or stones.

Branches and fittings shall be laid by the Contractor as indicated on the drawings, and/or as
directed by the Engineer. Open ends of pipe and branches shall be closed with PVC caps secured
in place with pre-molded gasket joints or as directed by the Engineer.

All pipe joints shall be made as nearly watertight as practicable. There shall be no visible
leakage at the joints and there shall be no sand, silt, clay, or soil of any description entering the

2019 Sewer Replacement Project Polyvinyl Chloride Gravity Pipe and Fittings
Nashua, NH 02085-3

3.02

3.03

C.

pipeline at the joints. Where there is evidence of water or soil entering the pipeline, connecting
pipes, or structures, the defects shall be repaired to the satisfaction of the Engineer.

The Contractor shall build a tight bulkhead in the pipeline where new work enters an existing
sewer. This bulkhead shall remain in place until its removal is authorized by the Engineer.

Care shall be taken to prevent earth, water, and other materials from entering the pipe, and when
pipe laying operations are suspended, the Contractor shall maintain a suitable stopper in the end
of the pipe and also at openings for manholes.

As soon as possible after the pipe and manholes are completed on any street, the Contractor shall

flush out the new pipeline using a rubber ball ahead of the water, and none of the flushing water
or debris shall be permitted to enter any existing sewer.

A tracer tape shall be placed in the trench as specified in Section 02518, TRACER TAPE.

CLEANING:

On completion of a section of sewer, the Contractor shall TV inspect the main section in
accordance with Section 02441, Cleaning and Television (CCTV) Inspection of Pipelines at
no additional cost to the Owner.

TESTING

Testing of pipe joints to identify joints that are defective shall be performed using either liquid
or air, at the Contractor's option. Test pressure used shall be acceptable to the Engineer.

The allowable pressure drop shall be 0.5 pounds in 15 seconds at a pressure greater than % pounds
per vertical foot of pipe cover, or 4 pounds minimum.

Electronic video equipment shall be capable of displaying and recording, at a minimum, the
following data for each pipe joint:

1. Project Identification

2. Date recorded

3. Footage counter

4. Test pressure

5. Sewer reach identification (street location, start MH and second MH)

D. PIPE DEFLECTION MEASUREMENT:

1. In accordance with ASTM D3034, no less than 30 days after completion of the PVC sewer
pipe installation, the Contractor shall test the pipeline for deflection using a "go/no-go"
deflection mandrel having a minimum of nine evenly spaced arms or prongs. The
"go/no-go" gauge shall be hand pulled through all sections of the pipeline by the
Contractor. The Contractor shall submit drawings of the "go/no-go" gauge to the Engineer

2019 Sewer Replacement Project Polyvinyl Chloride Gravity Pipe and Fittings
Nashua, NH 02085-4

for approval prior to testing. Complete dimensions of the gauge for each diameter of pipe
to be tested shall be in accordance with ASTM D3034.

2. Any section of pipe found to exceed 7.5 percent deflection shall be deemed a failed pipe
and shall be excavated and replaced by the Contractor at his own expense.

END OF SECTION

2019 Sewer Replacement Project Polyvinyl Chloride Gravity Pipe and Fittings
Nashua, NH 02085-5

SECTION 02252

SUPPORT OF EXCAVATION
PART 1 - GENERAL
1.01 WORK INCLUDED:
A. This section of the specification covers sheeting and bracing for support of

excavations. The requirements of this section shall also apply, as appropriate, to other
methods of excavation support and underpinning which the Contractor elects to use to
complete the work.

B. The Contractor shall furnish and place sheeting of the kinds and dimensions required,
complying with these specifications, where indicated on the drawings or ordered by the
Engineer.

1.02 RELATED WORK:
A. Section 02300, EARTHWORK.

1.03 QUALITY ASSURANCE:

A. _ This project is subject to the Safety and Health regulations of the U.S. Department of Labor
set forth in 29 CFR, Part 1926, and to New Hampshire law, RSA, Title XXIII: Labor.
Contractors shall be familiar with the requirements of these regulations.

B. The excavation support system shall be of sufficient strength and be provided with
adequate bracing to support all loads to which it will be subjected. The excavation support
system shall be designed to prevent any movement of earth that would diminish the width of
the excavation or damage or endanger adjacent structures.

PART 2 - PRODUCTS

2.01 MATERIALS:

A. Steel used for bracing shall be of such size and strength as required in the excavation
support design. Timber or steel used for bracing shall be new or undamaged used material
which does not contain splices, cutouts, patches, or other alterations which would impair its
structural integrity or strength.

2019 Sewer Replacement Project Support of Excavation
Nashua, NH 02252-1