Appendix D_Engineering Report

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5 ENGINEERING ASSESSMENT

5.1 Earthworks
Clearing of vegetation on the site will be undertaken in stages in accordance with an erosion
and sediment control plan. Following clearing, preliminary earthworks will be undertaken to
provide level building pads for the residential buildings.

A geotechnical investigation has been prepared by Tectonic Geotechnical and Environmental
Engineers for Precinct E2 and Precinct F. Borehole testing within Precinct E2 indicates
subsurface profiles comprising loose sand to depths of about 1.0m to 1.5m below the ground
level underlain by medium to dense sands. Based on the site soil conditions and topography, the
report recommends that building footings for all proposed buildings along the ridge and flanks
of the ridge be supported by piled foundations taken at least 3m into the dense sand sub layer.

All temporary batters will be constructed a minimum 0.5m in from the property boundary with
a maximum temporary batter slope of 1 in 2 or as stated in the geotechnical investigation. The
proposed earthworks over the subject site will be carried out under Level 1 geotechnical
supervision and as per AS3798 – 2007 “Guidelines on earthworks for commercial and residential
developments”.

Refer Appendix E for the Concept Bulk Earthworks Plans.

5.2 Erosion and Sediment Control
The siteworks will be generally contained within the property boundary however there will be
some minor external roadworks required as part of the development associated with the Resort
Drive development frontage.

Any sediment generated during the construction phase shall be dealt with in accordance with
an Erosion and Sediment Control Plan to be prepared by Morgan Consulting Engineers and kept
on site during the construction phase. Erosion and Sediment Control (ESC) Measures such as silt
fences, diversion drains, drainage structure protection and dust control (clearing) will be
implemented. Silt fences are to be erected along the boundary of the site and around the
construction area. These fences are to be cleaned by the contractor when the capacity is
reduced by 25%. Where possible, disturbance to the existing surface is to be limited to the
immediate work area. The existing ground cover is not to be stripped until the contractor is
ready for earthworks to begin.

Temporary sediment basins are to be designed and constructed prior to bulk earthworks
activities being conducted. Stockpiles and construction materials are not permitted to be
stored within the road reserve and should be contained using silt fences. Diversion drains are to
be provided at upstream catchments to reduce flows to earthworks areas. In any areas where
flows could enter adjacent properties temporary stabilisation is to be provided.

The contractor is responsible for providing and staging all ESC measures as soon as earthworks
have commenced and to suit construction. A temporary construction exit is to be located at
each entry point to the site and will be determined based on the stage of works being
completed. The contractor is to ensure all dust tracked onto surrounding roads is immediately
swept to remove silt/dust.




Engineering Services Assessment
Residential Development at Precinct E2, Noosa Springs, Noosa Heads