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SECTION 02530
BUILDING CONNECTIONS AND DROP CONNECTIONS
PART 1 - GENERAL
1.01 ©WORK INCLUDED:

A. This Section covers furnishing of all materials and labor to construct building sewer
connections and drop connections as indicated on the Drawings, and as herein specified.

B. _ Final location of building connections shall be determined in the field by the Engineer.

1.02 RELATED WORK:

A. Section 02300, EARTHWORK

B. Section 02324, ROCK EXCAVATION AND DISPOSAL

C. Section 02631, PRECAST MANHOLES AND CATCH BASINS

D. Section 02531, SEWER CHIMNEYS

E. Section 02085, POLYVINYL CHLORIDE GRAVITY PIPE AND FITTINGS

F. Section 02518, TRACER TAPE
G. Section 02533, CONNECTIONS TO EXISTING STRUCTURES
H. Section 03302, FIELD CONCRETE

1.03 SUBMITTALS: IN ACCORDANCE WITH REQUIREMENTS OF GENERAL
SPECIFICATIONS, SUBMIT THE FOLLOWING:

A. Six sets of shop drawings and manufacturers literature of the materials of this section shall be
submitted to the Engineer for review.

B. Shop drawings of any special connections, including the proposed adapters for service
connections, shall be submitted to the Engineer.

PART 2—PRODUCTS
2.01 MATERIALS:

A. Pipe and fittings for drop connections and for gravity building connections shall be as
specified under Section 02085 POLYVINYL CHLORIDE GRAVITY PIPE AND
FITTINGS. Adaptors shall be as recommended by the pipe manufacturer.

02530-1

To:

From:

Re:

D. Motion:

Discussion:

City of Nashua, Public Works Division
Board of Public Works Meeting Date: July 28, 2022

Daniel Hudson, P.E., City Engineer
Engineering Department

2022 Sewer Rehabilitation — Siphon Rehabilitation Construction

To approve the construction contract for Siphon Rehabilitation with Insituform
Technologies LLC of Chesterfield, MO in an amount of $1,173,000. Funding will
be through Department: 169 Wastewater; Fund: Bond; Activity: Sewer
Infrastructure Improvements.

During Phase 1 of the Capacity, Management, Operation and Maintenance
(CMOM) program, eight locations where inverted sewer siphons convey
wastewater from one side of a waterway to the other side were cleaned and
inspected using closed circuit television (CCTV). Fourteen of the 22 siphon
sections, ranging in size from 8 inches to 36 inches, were identified with
deficiencies that include cracks, erosion of cement lining, corrosion, holes, and
exposed rebar. Rehabilitation of these pipes will be completed using cured-in-place
pipe lining (CIPP) methods. Strategies to temporarily redirect wastewater flow
through different barrels are required to make the repairs. Access to these sites with
lining equipment will be a challenge and will likely require tree and vegetation
removal.

This project was advertised for bid on June 14, 2022. A mandatory prebid meeting
was held on June 23, 2022 and three contractors attended. On July 14, 2022, the
following bids were received:

Insituform Technologies LLC of Chesterfield, MO $1,173,000.00
National Water Main Cleaning Co. of Boston, MA $1,337,750.00

Insituform Technologies at a bid price of $1,173,000.00 is the qualified low bidder.
Their references have been checked by engineering consultant Hazen.

B.

Concrete for encasement shall be as specified in Section 03302 FIELD CONCRETE.

PART 3 - EXECUTION

3.01

A.

INSTALLATION:

BUILDING CONNECTIONS:

1.

Building connections shall be installed using the same construction and pipe joining
techniques as specified in Section 02085 POLYVINYL CHLORIDE GRAVITY PIPE
AND FITTINGS.

In general, connections shall be carried only to the property line. The end of the pipes
shall be closed with PVC stoppers jointed 1n place to ensure against infiltration into the
sewer line.

In general, the mainline sewer has been designed at depths to accommodate full
basement service for each building to be connected. Building connections must be
installed at the proper depth in every case that full basement service 1s possible for the
building. The CONTRACTOR will be required to excavate, remove, reinstall and
backfill any building connection improperly installed at his own expense. The
CONTRACTOR will demonstrate to the Inspector that all connections are properly
made.

In streets where building sewers must cross water mains, the CONTRACTOR will
install the building sewers at proper depths to maintain the vertical clearance between
the two pipes, as shown in the construction details. Building services shall be installed
beneath water mains.

DROP CONNECTIONS:

1.

When the invert of a pipe entering a manhole is 24 inches or more above the invert of
the lowest pipe leaving the manhole, it shall be connected to the manhole with an
inside drop section.

The drop pipe shall be the same diameter, material, and class as the sewer pipe
entering the manhole, unless otherwise noted in the drawings. The drop connection
shall be constructed as shown on the City of Nashua Standard details.

All connecting hardware shall be stainless steel.

END OF SECTION

02530-2

SECTION 02533
CONNECTIONS TO EXISTING STRUCTURES OR SEWER MAINS
PART | - GENERAL

1.01 WORK INCLUDED:

The Contractor shall furnish materials, tools, labor and equipment to cut suitable openings
into the existing sewer manholes, make connections to existing sewers and all other work
necessary to direct the existing sewage flow as indicated on the drawings and as herein
specified.

1.02 RELATED WORK:
Section 02631, PRECAST MANHOLES AND CATCH BASINS
Section 02085, POLY VINYL CHLORIDE GRAVITY PIPE AND FITTINGS
Section 01735, CUTTING, CORING and PATCHING

1.03 SUBMITTALS: INACCORDANCE WITH REQUIREMENTS OF THE GENERAL
SPECIFICATIONS, SUBMIT THE FOLLOWING:

Prior to start of work, submit details of the methods proposed for doing the work and for
maintaining the sewage flow as herein specified.

PART 2 - PRODUCTS

A. Products for attaching to existing sewer manholes are described in Sections 02631 (Precast
Manholes and Catch Basins) and Section 01735 (Cutting, Coring and Patching)

B. Products for attaching sewer service lines or drain lines to existing sewer mains (that have
been CIPP lined for this project):

1. Connection of new sewer service or drain pipe to existing sewer mains shall be by
mechanical saddles (as described in ttems 2 and 3 below). The connection device shall
provide a firm base that will hold and attach the service main to the existing pipe
without the possibility of the pipe becoming loose or detaching from the main. Putting
the pipe in the main and grouting around it will not be allowed.

2. Where feasible and sizing allows this type of connection, the preferred method of
attachment of PVC service or drain pipe to the existing main 1s by aROMAC “CB”
Sewer Saddles or equal.

3. Should the ROMAC type service connection not be feasible due to pipe size or other
constraints, the connection may be made using a Kor-N-Tee, Inserta Tee or equal.
These types of fittings rely on having enough of the pipe wall thickness present to
create tension between the fittings the pipe wall such that fitting will be held securely in

02533-1

place. Should the Contractor elect to use this type of fitting the submittal must include
an evaluation of the existing pipe wall thickness (after CIPP lining) and provide cut
sheets from the manufacturer showing this type of fitting will achieve the desired
results.

PART 3 - EXECUTION

3.01

A.

B.

INSTALLATION:

The Contractor shall provide temporary plugs or provide other suitable means for
maintaining the new sewer free of sewage flow until such time as it can be inspected and
tested for leakage.

Connections to the new sewer shall be made when directed by the Engineer and only after the
new pipeline has been inspected and has successfully passed the leakage test.

The Contractor shall modify each existing structure for installation of the necessary piping,
but in so doing shall confine the cutting to the smallest amount possible consistent with the
work to be done.

All new piping connected to existing structures shall be encased in concrete in a manner
satisfactory to the Engineer.

All work shall be done with the proper tools and by careful workmen competent to do
work.

The Contractor shall cut, reshape and fill the existing manhole tables and plug existing
outlets as indicated on the drawings and as directed by the Engineer, to accommodate the
new connections. Reshaped manhole invert channels shall be smoothly shaped to permit
the flow of sewage. Manhole invert channels shall be reconstructed as specified under
Section 02631, PRECAST MANHOLES AND CATCH BASINS and shall comply with
the City of Nashua Standard Specifications for Sewers and Drains.

END OF SECTION

02533-2

SECTION 02534
FILL SEWER PIPE OR STRUCTURE (TO BE ABANDONED)
PART 1 - GENERAL

1.01 WORK INCLUDED:

The existing sewer pipe to be abandoned in place shall be completely filled with
"Flowable Fill" after the sewerage has been re-routed through the new sewer main
This work shall include all materials, labor, pumping, shoring, and cleanup required
to complete this item.

1.02 RELATED WORK:
Section 02631, PRECAST MANHOLES AND CATCH BASINS

1.03 SUBMITTALS: INACCORDANCE WITH REQUIREMENTS OF THE GENERAL
SPECIFICATIONS, SUBMIT THE FOLLOWING:

The contractor shall submit his proposed method for filling the cement pipe to the
Engineer for approval 2 weeks prior to scheduling the work. The "Flowable Fill"
mix shall be comprised of Portland cement, water, sand and other additives to insure
that the material shall flow the entire length of the pipe and completely fill the void.
The mix design for the "Flowable Fill" shall be submitted to the Engineer for
approval.

PART 2 - PRODUCTS - NOT APPLICABLE

PART 3 - EXECUTION

3.01. INSTALLATION:

A No work shall be done without approval from the Engineer. The contractor shall
demonstrate to the Engineer by visual inspection or other means that the existing
pipe has been completely filled.

B. — All work shall be done with the proper tools and by careful workmen competent to do

work.

END OF SECTION

02534-1

SECTION 02619

REPLACEMENT OF EXISTING DRAINS

PART 1 - GENERAL

1.01 WORK INCLUDED:

This section covers those areas of work where the proposed sewers will cross existing drain
pipes and structures.

1.02 RELATED WORK:
A. Section 02300, EARTHWORK.
B. Section 02085, POLYVINYL CHLORIDE GRAVITY PIPE AND FITTINGS.
1.03 REFERENCES:
The following references form a part of this specification:
American Society for Testing and Materials (ASTM)
ASTM C76 - Reinforced Concrete Culvert, Storm Drain and Sewer Pipe
PART 2 - PRODUCTS
2.01 © REPLACEMENT PIPE:

Reinforced concrete pipe used to repair or replace existing drains shall meet the
requirements of ASTM C76.

PART 3 - EXECUTION
3.01 GENERAL REQUIREMENTS:

A. _ Present information indicates that the existing drains are constructed of reinforced concrete
pipe (RCP) or corrugated metal pipe (CMP) unless otherwise noted on the drawings.

B. The approximate locations and depths of existing drains are indicated on the drawings, if
they are known.

02619-1

3.02

The vertical clear distance between sewers and drains shall be no less than 18 inches unless
otherwise approved by the Engineer or specifically indicated on the drawings. In locations
where sewers will pass over or under existing drains, the Contractor shall plan the laying of the
pipeline such that the drain pipe 1s approximately centered between joints on the sewer pipe.

Drains which are shown on the plans or located in the field and are damaged by the
Contractor shall be replaced with identical materials at the Contractor's expense unless the
Engineer agrees in writing that the Contractor was not at fault.

PIPING REPLACEMENT:

Replacement sections of pipe shall be installed at the lines and grades of the existing drain
pipes.

The replacement pipe shall be of the same size as the existing section to be replaced, and
shall maintain the existing invert slope.

Pipe joints shall be made using 2000 psi mortar, placed to produce a watertight seal.

Joints shall not be backfilled until approved for water-tightness by the Engineer.

END OF SECTION

02619-2

SECTION 02631
PRECAST MANHOLES AND CATCH BASINS
PART 1 - GENERAL
1.01 WORK INCLUDED:

A. This Section covers all precast manholes and catch basins complete, including, but not
limited to, bases, walls, cones, mortar, inverts, frames and covers.

B. Work shall comply with City of Nashua Standard Specifications for Sewers and Drains
(Appendix A).

1.02 RELATEDWORK:

A. Section 02300, EARTHWORK

B. Section 02745, PAVING

C. Section 03302, FIELD CONCRETE
1.03 SYSTEM DESCRIPTION:

A. Precast sections shall conform in shape, size, dimensions, materials, and other respects to the
details indicated on the drawings or as ordered by the Engineer.

B. — All manholes and catch basins shall have concrete bases. Concrete bases shall be precast
unless otherwise specified. Invert channels shall be formed of brick and mortar upon the

base.

C. Catch basins shall have a 4-foot deep sump supplied by E.L. Lebaron Foundry
Company, Brockton, MA., or approved equal unless otherwise specified.

D. Riser and cone sections shall be precast concrete.
1.04 REFERENCES:
A. The following standards form a part of this specification as referenced:
American Society for Testing and Materials (ASTM)
ASTM A48 Gray Iron Castings

ASTM C32 Sewer and Manhole Brick

02631-1

ASTM C144 Aggregate for Masonry Mortar

ASTM C207 Hydrated Lime for Masonry Purposes
ASTM C478 Precast Reinforced Concrete Manhole Sections
ASTM C923 Specification for Resilient
Connectors Between Reinforced Concrete
Manhole Structures and Pipes
ASTM C1244 Standard Test Method for Concrete Sewer Manholes by the

Negative Air Pressure (Vacuum) Test.
American Association of State Highway and Transportation Officials (AASHTO)
AASHTO Ml98Joints for Circular Concrete Sewer and Culvert Pipe Using
Flexible Watertight Gaskets
Occupational Safety and Health Administration
OSHA 29 CFR 1910.27 Fall Prevention Protection

1.05 SUBMITTALS: INACCORDANCE WITH REQUIREMENTS OF GENERAL
SPECIFICATIONS, SUBMIT THE FOLLOWING:

A. Six sets of manufacturer literature of the materials of this section shall be submitted to the
Engineer for review.

B. _ Tests reports as required shall be submitted to the Engineer.
PART 2 - PRODUCTS 2.01 | PRECAST CONCRETE SECTIONS:

A. All precast concrete sections shall conform to ASTM C478 with the following exceptions
and additional requirements:

1. The wall thickness of precast sections shall be as designated on the drawings,
meeting the following minimum requirements:

Section Diameter (Inches) Minimum Wall Thickness (Inches)
48 5
60 6
72 7
84 8

2. Type II cement shall be used except as otherwise approved.

0263 1-2