SECTION 204 — CLASS 2, CLASS 3, AND CLASS 4 EXCAVATION

204.1 DESCRIPTION — This work is excavation for ditches, stream channels, culverts, drains, and structures.
The three classes of excavation include the following, as shown on the drawings or the Standard Drawings.

(a) Class 2 Excavation. Excavation for inlet, outlet, and parallel ditches; stream channels; structures removed below the ground surface and not replaced with new structures; spillways; and half-circle pipe.

(b) Class 3 Excavation. Excavation for new grade separation and drainage structures, new retaining walls, and wingwalls.

(c) Class 4 Excavation. Excavation for pipe culverts; pipe-arches; metal plate pipe; metal plate pipe-arches; standard endwalls for pipe culverts and pipe-arches; and excavation in excess of the standard depth for pavement base drains, pipe underdrains, subsurface drain outlets, and subgrade drains.


204.3 CONSTRUCTION —

(a) Foundations. Notify the Engineer sufficiently in advance of excavation for structures so that cross sections may be obtained. An approximate foundation elevation is indicated, but, in all cases, excavate to a depth which provides a satisfactory foundation, as directed. Do not disturb the foundation area to the extent that requires removal of additional material to provide a satisfactory bearing. Compact direct load bearing foundation to the original bearing capacity as specified in Section 206.3(b). Do not place concrete or masonry until the foundation area has been accepted.

(b) Drilling and Blasting. Drill and blast to complete the excavation to the required lines, with the least disturbance to remaining material.

(c) Bracing and Shoring. Section 203.3(h)

(d) Cofferdams. Drive timber or metal sheeting to a depth below the bottom of foundation, substantially braced in all directions to form a cofferdam, when required, permitting the foundation area to be pumped reasonably free of water while concrete or masonry is being placed. Where the foundation area is of sandy or other porous materials, the Engineer may require the cofferdam to be sealed below the foundation with sufficient concrete so that it may be pumped reasonably dry. Remove sheeting and bracing, unless otherwise indicated or permitted to remain in place.

(e) Backfilling. Backfill spaces excavated for, but not occupied by, structures, with acceptable material, as specified in Section 206.3(b).

(f) Ditch and Stream Channel Slopes. Trim slopes neatly to the lines indicated. Do not remove or excavate any material beyond lines indicated, without written authorization.

(g) Topsoil. Dispose of or utilize topsoil removed in Class 2 Excavation, as specified in Section 203.3(g).

(h) Suitable Material Required for Embankment and Backfill.
Section 203.3(j)

(i) Unsuitable and Surplus Material. Section 203.3(k)


204.4 MEASUREMENT AND PAYMENT — Cubic Yard

Measured, using the methods specified in Section 203.4(a)2, for the class of excavation indicated.
Excavation for concrete and masonry structure foundations below the approximate elevation indicated will be paid for, as specified in Section 1001.4(f).
Payment will not be made for material removed or excavated in advance of obtaining cross sections, unless authorized.

Most Current Supplement

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