204CLASS 2, CLASS 3, CLASS 4, AND EXISTING DITCH CLEANING EXCAVATION

EXCAVATION

204.1DESCRIPTION—This work is the cleaning of existing ditches and the excavation for ditches, stream

channels, culverts, drains, utilities, and structures. The four classes of excavation include the following, as shown on the Standard Drawings or as indicated.

removed below the ground surface and not replaced with new structures; spillways; and half -circle pipe.

walls, abutments, piers, and wingwalls.

arches; standard endwalls for pipe culverts and pipe -arches; utilities; and excavation in excess of the standard depth for pavement base drains, pipe underdrains, subsurface drain outlets, and subgrade drains.

existing ditches.

204.3CONSTRUCTION—

cross-sections may be obtained. Excavate to a depth that provides a satisfactory foundation, as directed. Do not disturb the foundation area to the extent that it 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.

disturbance to remaining material. Do not blast within 5 feet of the foundation bearing elevation. Remove remaining rock to bearing elevation using mechanical means.

braced in all directions to form a cofferdam, when required, allowing the foundation area to be pumped reasonably free of water while concrete or masonry is being placed. The Representative may require the cofferdam to be sealed below the foundation with sufficient concrete so that it may be pumped reasonably dry where the foundation area is of sandy or other porous materials. Remove sheeting and bracing when no longer required, unless otherwise indicated or directed.

as specified in Section 206.3(b).

excavate any material beyond lines indicated, without written authorization from the Representative.

matter from within the limits of the existing ditch and side slopes as indicated or directed and as specified

in Section 204.3(f).

utility facility to be laid in the approximate center of the trench. Excavate unsuitable material to width and depth as directed. Excavate rock six inches below bottom of trench.

204.4MEASUREMENT AND PAYMENT—

Measured, using the methods specified in Section 203.4(a)2, for the class of excavation indicated. When directed to perform excavation below the indicated structure foundation elevation, the Department will pay for excavation as additional work, as specified in Section 110.03(b), to a maximum depth of 2 feet, and as extra work, as specified in Section 110.03(c), beyond a depth of 2 feet. When directed to perform excavation in rock below utility trench design elevations, the Department will pay for the excavation and backfill as specified in Section 110.03(c), to a maximum depth of 6 inches. When directed to perform utility trench excavation of unsuitable material , the Department will pay for the excavation as specified in Section 110.03(b). The Department will not pay for material removed or excavated in advance of obtaining cross -sections, unless written authorization by the Representative is first obtained.