SECTION 722
MANHOLES, CATCH BASINS, AND INLETS
722.01 DESCRIPTION
This work consists of constructing and adjusting manholes, catch basins, and inlets, including the furnishing or
resetting of necessary metal frames, covers or gratings, valve boxes, or other accessories to new lines and
grades.
722.02 EQUIPMENT
Reserved
722.03 MATERIALS
Item
Concrete Class AE
Precast Reinforced Concrete Pipe Manholes
Frames, Tops, Covers, Fittings, and Gratings
Reinforcing Steel
Section
802
830.01 B or C
834.02 C or D
836.02 A
Compose mortar of one part cement to two parts of sand by volume. A maximum of 10 percent of the cement
content, by weight, may be replaced with lime.
722.04 CONSTRUCTION REQUIREMENTS
A. Precast Reinforced Concrete Pipe Manholes, Inlets, and Catch Basins
Use reinforced concrete sewer pipe for this purpose. If this type of construction is used, construct the joints
by one of the following methods:
1. Mortar;
2. Rubber Gaskets; or
3. Cold applied preformed plastic gaskets.
B. Concrete Construction (Cast-in-Place)
Construct cast in place concrete as specified in Section 602 “Concrete Structures.”
Finish the concrete surface to present a neat and smooth appearance. Fill honeycomb with cement mortar
mixed in the same proportions used in the concrete for the work.
C. Concrete Base (Pre-Cast or Cast-in-Place)
Shape the invert channel to the true shape of the lower half of the pipe or sewer. Construct the bottom
edge of the barrel for manholes, catch basins, and inlets to fit flush on the base. Grout the joint between
the base and the barrel with cement mortar.
D. Pipe Connections
Extend pipe or tile through the walls a sufficient distance to allow for connections. Construct the concrete
around the pipe or tile to prevent leakage along their outer surface. Ensure the inside ends are flush with or
protrude through the inside walls, and the pipe is the same size and kind as those they connect with on the
outside.
E. Placing Castings
Set castings in full mortar beds.
Construct manholes, catch basins, and inlets so that a maximum of 6 inches of precast concrete
adjustment rings are needed to set the casting to grade.
F. Backfill
Place backfill in lifts not exceeding 6 inches loose measurement. Compact the material as specified in
Section 203.04 E.2.a “AASHTO T 180.”
G. Cleaning
Clean all manholes, catch basins, and inlets of accumulations of silt, and deleterious material.
H. Adjustments to Existing Units
Make adjustments to the structure walls by the use of brick, solid concrete blocks, precast ring, or Class AE
concrete so that a seat of proper dimensions may be reconstructed to receive the casting, grating, or cover.
If the top of the existing structure is weak and faulty, replace it as directed, and complete the extension.
I.
Maintenance of Drainage
If the existing drainage facilities become inoperable before the new drainage system is functioning, provide
sufficient temporary pumping and drainage facilities to keep the roadway drained to the satisfaction of the
Engineer. Include the cost of providing sufficient temporary pumping and drainage in the price bid for other
items.
722.05 METHOD OF MEASUREMENT
The Engineer will measure, completed and in place, as specified in Section 109.01 “Measurement of
Quantities” and as follows:
A. Catch Basins and Inlet
The Engineer will include the base, casting, cover, and gate as part of the catch basin and inlet bid item
B. Manholes
The Engineer will include the base, casting, cover, and gate as part of the manhole bid item.
C. Manhole Risers
The Engineer will measure manhole risers from the base to the bottom of the precast cover or the casting.
722.06 BASIS OF PAYMENT
Pay Item
Manhole___ IN
Manhole Tee ___IN × IN
Manhole Sanitary
Manhole Riser __ IN
Inlet – Type __
Adjust Manhole
Adjust Inlet
Adjust Utility Appurtenance
Pay Unit
Each
Each
Each
Linear Foot
Each
Each
Each
Each
Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete
the work as specified.
Changes noted in Section 722 – Manholes, Catch Basins, and Inlets
722.03 MATERIALS

Removed:
o “Materials shall meet the following:
o “Brick”
o Concrete Masonry Units”
o “All materials used are subject to approval.”
722.04 CONSTRUCTION REQUIREMENTS
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2008 Spec Section A. Excavation is REMOVED
2008 Spec Section B. Brick Masonry Construction is REMOVED
Section C. Concrete Base (Pre-Cast or Cast-in-Place)
o Removed:
 “The thickness and other dimensions of the base shall be as specified.”
Section D. Pipe Connections
o Removed:
 “The cost of the materials, equipment, and labor to make the connections shall
be included in the other items.”
2008 Spec Section H. Reinforcement is REMOVED
Section E. Placing Castings
o Removed:
 “Castings shall be set accurately to the correct elevation so no subsequent
adjustment is necessary.”
Section H. Adjustments to Existing Units
o Note that brick was removed from Materials list; should it not be removed here?
Section I. Maintenance of Drainage
o How do we include the cost of this drainage maintenance when we don’t know if it going
to be required?
722.05 METHOD OF MEASUREMENT


Removed:
o “Excavation, embankment, and disposal of unsuitable or excess materials will not be
measured but will be included in Pay Items.”
Added:
o “The Engineer will measure, completed and in place, as specified in Section 109.01
“Measurement of Quantities” and as follows:”
722.06 BASIS OF PAYMENT


Removed:
o “Payment will be made at Contract Unit Prices for the following:”
o “Catch Basins”
o Adjust Catch Basin”
Added:
o “Manhole Tee ___ IN x IN
Each”
o “Manhole Sanitary”