Before placing any fill the Contractor may be required to carry out compaction trials to confirm to the Geo-Professional the adequacy of the machinery and procedures which he/she proposes to use for each of the fill types.
The trials shall use the same compaction equipment and be on fill materials representative of those to be used for the permanent works. Separate trials will be necessary for each distinct fill type and ongoing compaction trials may become necessary as the works proceed and/or where other fill types are identified. The Contractor shall keep the Geo-Professional informed of fill material types being used or encountered during the course of the works and depending on the materials encountered, the Geo-Professional may instruct additional compaction trials be carried out.
The programme and procedures shall be proposed by the Contractor for the Geo-Professional's approval before any compaction trials begin. The compaction trials shall comprise spreading and compacting of a minimum of three superimposed 200mm loose thickness layers of soil. The area of the compaction trial shall be sufficient to allow construction procedures and compaction to be representative of the permanent works. For compaction trials of rock fill the trial area shall not be less than 200m².
Following completion of the compaction trials the procedures and construction plant shall be approved by the Geo-Professional and shall not be subsequently modified without the prior approval of the Geo-Professional.
During the compaction trials the Contractor may develop ad hoc tests which he/she may use as an approximate guide to the standard of compaction subject to the tests being approved by the Geo-Professional.
Definitions in this section