Attachment B - Geotechnical Investigation Report AG-220544-RPT-G-01_[Rev A]

                                                                                                       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                      Major                         Low
         Creep in Shallow Soils                 Unlikely                    Minor                         Low
 Rotational or translation slide down the       Possible                    Minor                      Moderate
                   slope

Based on the results of the AGS assessment, the perceived risk based on the conditions encountered and information
available at the time of the assessment is “Low to Moderate”. Where the recommendations in the following
sections are adhered to, a "Low" risk rating may be adopted.



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 at least 0.3 m into the underlying bedrock.
 No fill should be placed on this site.
 Where slopes are not supported by an engineer designed support system, natural slopes within or near movement
  sensitive areas should be no steeper than 2.5H:1V.
 All stormwater and surface water is to be discharged by an approved stormwater drainage system. The use of
  subsurface drainage systems are not suitable unless greater than 50 m downslope from the envelope at this site.
 Ongoing maintenance of any effluent wastewater areas are also considered mandatory. The location of the
  application area should be located below the proposed building.
 Plumbing and services must also not be allowed to leak and regular maintenance and inspections should be
  undertaken
 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.
If footings are located adjacent to an underground service or other obstruction that is not homogenous with the
founding strata, the footing should be extended a minimum 0.3 m below an imaginary line projected at a 45 degree
angle from the lowest point of the service/obstruction. This is depicted graphically for reference:


Sunshine Coast | Brisbane | Gold Coast