604Manholes,

604.01 Description

This work is constructing manholes, combination manholes and inlets, and inlets.

604.02 Materials

604.02.1 General

Furnish materials and precast structures in accordance with the contract requirements.

604.02.2 Concrete

Furnish Class General concrete or equivalent in accordance with Section 551, except that precast concrete manhole riser sections must have a minimum 4,000-psi (27.6 MPa) 28-day compressive strength.

604.02.3 Reinforcing Steel

F urnish reinforcing steel in accordance with Section 555 and Subsection 711.01.

604.03 Construction Requirements

604.03.1 General

Construct and install the structures as specified in the contract.

604.03.2 Excavation

The Project Manager will establish the lines and grades for structure excavation. Compact foundations in accordance with Subsection 203.03.3 t o provide full bearing for the structures.

604.03.3 Backfill

U niformly place backfill around structures in maximum 6-inch (150 mm) deep loose layers and compact in accordance with Subsection 203.03.3. Maintain the established structure lines and grades while backfilling.

604.04 Method of Measurement

604.04.1 Manhole and Inlet Structure Bases

Manhole and Inlet Structure bases are measured by the each for the first 5 vertical feet (1520mm) of the structure. Manhole and Inlet Structures less than 5 feet from the top of the floor slab to the top of the roof slab or additional barrel is one manhole or inlet base. Structures exceeding 5 feet will include an additional barrel.

604.04.2 Additional Barrel

Additional Barrels are measured by the foot (m) as the vertical distance from the top of floor slab to the top of the roof slab or additional barrel minus the 5-foot base.

604.04.3 Concrete Apron

Concrete Apron is measured by the each.

604.04.4 Curb and Drop Inlet Frame and Grate, and Manhole Frame and Lid

Curb and Drop Inlet Frame and Grate, and Manhole Frame and Lid are measured by the each. 604 – MANHOLES, COMBINATION MANHOLES 2020 EDITION V5.1 AND INLETS, AND INLETS 604-2

604.04.5 Median Inlet

Median Inlets as shown in the detailed drawings and plans are measured by the each and include all materials.

604.05 Basis of Payment

Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit Manhole Structure Base Each Inlet Structure Base Each Additional Barrel Foot (m) Concrete Apron Each Curb Inlet Frame and Grate Each Drop Inlet Frame and Grate Each Manhole Frame and Lid Each Median Inlet Each Payment for all costs associated with excavation and backfill required for above items is included in the contract unit price of each respective drainage item.