Appendix D Geotechnical report · MCU18/0013

Project No. 304-2014
November, 2004 Page 7

6.2.5 Earthworks Supervision

Given the building type and the nature of the earthworks operation associated with the
in-ground water tank, it is recommended that earthworks operations be carried out under

geotechnical engineering supervision as set out in Appendix B of AS.3798-1998.

It should be made clear in any earthworks specification as to what is actually required of
the Engineer/Supervisor/Geotechnical Testing Authority to provide in terms of

certification.

It is recommended that the following objectives (as a minimum) be incorporated into the

earthworks specification:-

* Certification that all general earthworks operations (ie. stripping, proof rolling of
subgrade, etc.) have been carried out in accordance with the earthworks

specification.
* Certification that uncontrolled fill has been replaced (if required) and compacted to

the required minimum density in accordance with the earthworks specification.
° Certification that the controlled fill material is suitable to support a conventional slab

on ground floor (slab loads of 10 to 15kPa).
* Certification that the quality of any imported fill complies with the earthworks

specification requirements.

Engineering certification should be provided by a Registered Professional Engineer of

Queensland.
6.2.6 Excavation Characteristics

It is anticipated that excavations will consist of the following:-

* Bulk Cuts - for site stripping and excavation to create basements, building platforms
and carpark/driveway areas.
*  Trenching - for high level footings and underground services.

* Drilling - for bored pier foundations.

Excavations on site should be within the capabilities of light plant, small dozer (Cat D4c
or similar) in bulk cuts and a medium sized backhoe (Case 580 or similar) or small
excavator (12t - 15t) in trenching, based on the investigation findings. Should substantial

excavations be required, larger plant could be budgeted to expedite workings.

 

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