220241.01 - 70 Blanckensee Road, BLACK MOUNTAIN - SECONDARY DWELLING - Slope Stability Report · EXE23/0033

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




 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 effluent wastewater areas are also considered mandatory.
 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.
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:




Where footings found into stiff or stronger clays residual clays, they may be dimensioned for a maximum allowable
bearing pressure of 100 kPa. Based on the borelogs, the above material is encountered at approximately 0.7 m to
0.8 m depth below existing surface levels at the time of the investigation.



Sunshine Coast | Brisbane | Gold Coast