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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

3. Sections shall be steam cured and shall not be shipped until at least five days after
having been cast.

4. Minimum compressive strength of concrete shall be 4000 psi at 28 days.
5. No more than two lft holes may be cast or drilled in each section.

6. The date of manufacture and the name or trademark of the manufacturer shall be
clearly marked on the inside of each precast section.

7. Acceptance of the sections will be on the basis of material tests and inspection of the
completed product.

x

Circumferential steel reinforcement 1n walls and bases shall be a minimum of 0.12 sq.
in/lin. ft. for 4-foot diameter sections and 0.15 sq. in//lin. ft. for 5- and 6-foot
diameter sections. Reinforcing shall extend into tongue and groove.

Conical reducing sections shall have a wall thickness not less than 5-inches at the bottom
and wall thickness of 8-inches at the top. Conical sections shall taper from a minimum of 48-
inches diameter to 30-inches diameter at the top, as shown on the drawings.

Except where insufficient depth of cover dictates the use of a shorter base, bases shall be a
minimum of 4 feet in height.

Slab top sections and flat riser sections (Grade Rings) shall conform to the contract
drawings, with particular attention focused upon the reinforcing steel and be designed to
meet or exceed an H-20 Loading requirement.

The tops of the bases shall be suitably shaped by means of accurate ring forms to recetve the
riser sections.

Precast sections shall be manufactured to contain wall openings of the minimum size to
receive the ends of the pipes, such openings being accurately set to conform with line and
grade of the sewer or drain. Subsequent cutting or tampering in the field, for the purpose of
creating new openings or altering existing openings, will not be permitted except as
directed by the Engineer.

"Drop-over" manholes shall be placed where indicated on the drawings. The Contractor
shall accurately measure the diameter of the existing outlet pipe and inform the
manufacturer of its size, so that the "Drop-over" type opening can be cut into the precast
manhole base. The bottom shall be cast in place by the Contractor in accordance with
Section 03302, FIELD CONCRETE. The invert channel shall be formed of brick and
mortar, as specified in this specifications section. The sub-base shall be a compacted, level
foundation of crushed stone, at least 6-inches thick, as specified in Section 02300
EARTHWORK, but shall vary to the depth necessary to reach sound undisturbed earth.

deleted dampproofing

The Engineer reserves the right to reject any unsatisfactory precast section and the rejected

0263 1-3

J.

2.02

A.

2.03

B.

unit shall be tagged and removed from the job site immediately.

The Engineer may also require the testing of concrete sections as outlined under Physical
Requirements in ASTM C478 with the Contractor bearing all testing costs.

BRICK MATERIALS:

Brick shall be sound, hard, and uniformly burned brick, regular and uniform in shape and
size, of compact texture, and satisfactory to the Engineer. Bricks shall comply with ASTM
C32, for Grade SS, hard brick, except that the mean of five tests for absorption shall not

exceed 8 percent by weight.

Rejected brick shall be immediately removed from the work and brick satisfactory to the
Engineer substituted.

Mortar shall be composed of portland cement, hydrated lime, and sand in which the volume of
sand shall not exceed three times the sum of the volumes of cement and lime. The
proportions of cement and lime shall be as directed and may vary from 1:1/4 for dense
hard-burned brick to 1:3/4 for softer brick. In general, mortar for Grade SS Brick shall be
mixed in the volume proportions of 1:1/2:4-1/2; portland cement to hydrated lime to sand.

Cement shall be Type II portland cement as specified for concrete masonry.

Hydrated lime shall be Type S conforming to ASTM C207.

The sand shall comply with ASTM C144 specifications for "Fine Aggregate," except that all
of the sand shall pass a No. 8 sieve.

FRAMES, GRATES AND COVERS:

Castings shall be of good quality, strong, tough, even-grained cast iron, smooth, free from
scale, lumps, blisters, sandholes, and defects of every nature which would render them unfit for
the service for which they are intended. Contact surfaces of covers and frame seats shall

be machined to prevent rocking of covers.

All castings shall be thoroughly cleaned and may be subject to a careful hammer inspection at
the Engineer's discretion.

Castings shall be ASTM A48 Class 30B or better.

The surface of the manhole covers shall have a diamond pattern with the cast words
"DRAIN" or "SEWER," whichever 1s appropriate.

Manhole frames with 32-inch covers for 30-inch openings shall be 500 pounds minimum by
E.L. LeBaron Foundary Co., No. LC328; Quality Water Products, Style 47; Neenah

Foundry Co., R1740B or approved equal.

0263 1-4