Finance Committee

American Society for Testing and Materials (ASTM):

ASTM D1557 Test for Moisture-Density Relations of Soils and Soil-
Aggregate Mixtures Using 10 Pound Rammer and 18-Inch
Drop

State of New Hampshire Department of Transportation (NHDOT) Standard
Specifications for Road and Bridge Construction, latest edition:

Section 304 Base Courses
Section 401 Plant Mix Pavements - Table 401-1, 401-2
Section 632 Retroreflective Pavement Markings

Prime and Tack Coats - shall conform to the NHDOT Standards

Federal Specifications:

SECTION 02745

ROAD RESTORATION

PART 1 - GENERAL

1.01

1.02

1.03

1.04

WORK INCLUDED:

2. The manhole shall be filled with water to the top of the cone section. If the excavation
has not been backfilled and observation indicates no visible leakage, that is, no water visibly
moving down the surface of the manhole, the manhole may be considered to be
satisfactorily water-tight. If the test, as described above, 1s unsatisfactory as determined
by the Engineer or 1f the manhole excavation has been backfilled, the test shall be
continued. A period of time may be permitted if the Contractor so wishes, to allow for

D. ACCESSORIES:
1. All accessories shall be installed in accordance with manufacturer's instructions.

2. Stubs shall be set accurately to the dimensions indicated on the drawings. Stubs shall be
sealed with suitable watertight plugs.

3.02 LEAKAGE TESTS FOR SEWER MANHOLES:

A. Leakage tests shall be made by the Contractor and observed by the Engineer on each
manhole. The test shall be by vacuum or by water exfiltration as described below:

B. VACUUM TEST:

4.

Precast reinforced concrete sections shall be set vertical and with sections in true
alignment.

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.

All holes in sections used for handling the sections shall be thoroughly plugged with mortar.

2.04 LEACHING CATCH BASINS

A. Leaching catch basins shall conform to the requirements for Products, Paragraph 2.1 herein.

B. _ Thestructure perforations shall be as detailed in the Contract Drawings.

C. Stone for backfill around the leaching catch basin shall conform to NHDOT Item 304.5, Crushed
Stone, Course. materials shall be top grade (100% solids, vulcanized) butyl rubber and shall meet
or exceed AASHTO M-198.

2.05 SEWER MANHOLE ACCESSORIES:

2.02 BRICK MATERIALS:

A. — 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.

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

B.

C.

I

J.

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.

8. Circumferential steel reinforcement in 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 S- and 6-foot diameter
sections. Reinforcing shall extend into tongue and groove.

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 M198Joints 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: IN ACCORDANCE WITH REQUIREMENTS OF GENERAL
SPECIFICATIONS, SUBMIT THE FOLLOWING:

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).