the depth necessary to reach sound undisturbed earth.
2. Precast reinforced concrete sections shall be set vertical and with sections in true
alignment.
3. Butyl rubber joint sealant shall be installed between each concrete section. Catch
basin sections do not require joint sealant if so indicated on the drawings.
C. Castings shall be ASTM A48 Class 30B or better.
D. The surface of the manhole covers shall have a diamond pattern with the cast words
"DRAIN" or "SEWER," whichever is appropriate.
E. 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.
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.
H. All manholes and catch basins shall be coated on the exterior with a bituminous damp-
proofing coating.
J. The Engineer reserves the right to reject any unsatisfactory precast section and the rejected
unit shall be tagged and removed from the job site immediately.
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2. Type Il cement shall be used except as otherwise approved.
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 lift 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.
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
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 RELATED WORK:
Section 01330, SUBMITTALS
Section 02085, POLYVINYL CHLORIDE GRAVITY PIPE AND FITTINGS
Section 02300, EARTHWORK.
Section 02745, ROAD RESTORATION
SECTION 02534
FILL SEWER PIPE 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.
The 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
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 place. Should the Contractor elect to use this type of fitting the submittal must
include an evaluation of the existing pipe wall thickness and provide cut sheets from
SECTION 02533
CONNECTIONS TO EXISTING STRUCTURES OR SEWER MAINS
PART 1 - 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, POLYVINYL CHLORIDE GRAVITY PIPE AND FITTINGS
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.
2. In general, connections shall be carried only to the property line. The end of the pipes
shall be closed with PVC stoppers jointed in place to ensure against infiltration into the
sewer line.
