General requirements

023 EXCAVATION

0231 EXCAVATION WORKS
02311 General

The Contractor shall, before starting excavation work satisfy himself as to the accuracy of the levels shown on the drawings or the directions given by the Engineer. Any discrepancies shall be reported to the Engineer prior to proceeding with the works.

Excavation shall be carried out to the lines, levels, width, depth and grades and shown on the drawings, directed by the Engineer or as appropriate to the works to be placed in the excavation.

Excavation shall be suitably trimmed and leveled before subsequent work is placed. In locations where the excavated material is loose, the bottom 100mm layer shall be left un-excavated until placing of concrete or masonry. This thickness shall be taken out just before the placement of concrete or masonry work.

In the event of over excavation without the approval of the Engineer, such over excavated area shall be filled with selected excavated or borrowed fill material approved by the Engineer and finished compacted.
Class C-5 concrete shall be used instead of selected material if instructed by the Engineer. All costs in connection with the fill of over excavation shall be borne by the Contractor.
Excess volume formed in excavation shall be filled with selected excavated or borrowed material approved by the Engineer and compacted to the compaction standard requirements in the Fill Section of the Specification.
The Contractor shall, when suitable bottoms to excavations have been reached report to the Engineer at least 24 hours before further work on excavated bottom is to proceed.
Any further work executed before obtaining the prior approval of the Engineer for the bottom of excavations shall be removed. New work shall be substituted only after the bottom of excavations is approved.

2312. 
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