Slope Stability Report (rec. 16.04.25) · MCU25/0042

                                                                                                           ABN 51 640 311 842
                                                                                                           arcosgroup.com.au
                                                                                          Sunshine Coast | Brisbane | Gold Coast




TABLE 1: AGS ASSESSMENT

                Hazard                         Likelihood               Consequence                      Risk Level
              Global failure                      Rare                      Medium                            Low
         Creep in shallow sand                   Possible                 Insignificant                    Very Low
  Rotational or translational slide down         Unlikely                    Minor                            Low
                 the slope

  Failure of engineered retaining walls           Rare                      Medium                            Low


Based on the results of the AGS assessment, the perceived risk to property based on the conditions encountered
and information available at the time of the assessment is “Low”.

7         HILLSIDE CONSTRUCTION
The following works should be implemented in addition to other items highlighted within this document. These points
are considered to be typical good hillside construction practice as explained in attached documentation:
 Footings should be founded into medium dense (or better) silty sand.
 Fill should be limited to no more than 1.5 m and should be step keyed into the existing slope. The fill should be
  formed at no steeper than 3H:1V, unless retained by an engineered retention system. All fill should be placed in
  accordance with AS3798.
 The design and integrity of retaining structures will need to be confirmed to adhere to good hillside construction
  methodologies including being globally stable (ie. designed to achieve a minimum safety factor of 1.5 against
  global instability).
 All stormwater and surface water is to be discharged by an approved stormwater drainage system.
 Avoid leakage from underground services and drains. Any leaking services or blocked drains should be remedied
  promptly.
 Erosion protection of cut and fill batters will be required. Batters should incorporate crest and toe drainage. Batters
  should be vegetated appropriately to minimise erosion.
 Overland flow paths will need to be carefully directed to approved outlets to minimise erosion possibility.

8         GEOTECHNICAL RECOMMENDATIONS
The following sections details specific geotechnical constraints or recommendations in addition to general hillside
construction notes.


8.1       FOOTINGS
In accordance with industry standards, a geotechnical engineer from Arcos should undertake the testing within the
footings to confirm that the encountered material is in alignment with the adopted parameters and assumptions
provided within this report. Where this does not occur, Arcos cannot be held liable for any of the information presented
within this report.
All footings will need to be designed to accommodate potential ground surface movement, settlement values and
any additional settlement values associated with the placement of new fill.
Settlement for suitably sized and designed high level footings should be in the order of 1-2% of the width of the
footing.



Sunshine Coast | Brisbane | Gold Coast