Avocet Pde OPW - App E Slope · OPW20/0092

                                                                                                     37 636 783 527

                                                                                                        PO BOX 851
                                                                                            Moffat Beach, QLD, 4551
                                                                                    [email protected]
                                                                                      www.geotechengineering.com.au




Table 2: Results of AGS Quantitative Risk Assessment
             Item                              Description                   Risk Level             Factor
     Natural Surface Slope              Between 5 and 15 degrees             Moderate                  0.5
   Slope Shape/Appearance                      Concave                        High                     1.5
         Site Geology                       Sedimentary rock                 Moderate                  1.0
          Soil Profile                   Residual soil >3m deep                  High                  1.5
   Regional Position on Hill                  Lower Slope                        High                  1.5
    Groundwater Evidence                    None apparent                        Low                   0.7
   Slope Instability Evidence             No sign of instability                 Low                   0.8
     Proposed Cut Depths                Cuts 1 m to 3 m in height            Moderate                  1.5
     Proposed Cut Angles                          45 to 60                    High                     1.5
          Fill Depths                       Fill <1 m in depth               Moderate                  1.1
       Fill Depth Angles                         45 to 60                        High                  1.5
       Battered Support                   Engineered - Other                 Very High                 1.5
          Type of Fill                   Track-rolled fill (sand)            Very High                 1.5
           Services                          Fully sewered                   Moderate                  0.8
     Stormwater Disposal                   To council system                 Moderate                  0.7
          Connectors                           Not used                      Very High                 2.0
        Footing Types                    AS2870 fit for purpose                High                    1.2
        Founding Strata                    Transported Soils                   High                    1.2
        Inground Tanks                          Unknown                      Very High                 4.0
    Landscaping/Drainage                        Unknown                      Very High                 4.0
  Upslope Failure (if needed)                   No action                    Very High                 4.0
                    Site Frequency ( 𝟎. 𝟎𝟎𝟎𝟒 × ∑ 𝑰𝒕𝒆𝒎 𝑹𝒊𝒔𝒌 𝑭𝒂𝒄𝒕𝒐𝒓𝒔 )                                  0.33
                      Site Relative Susceptibility Risk to Instability                                Low


Table 3: Results of AGS Qualitative Risk Assessment
                Hazard                        Likelihood            Consequence              Risk Level
              Global Failure                 Barely Credible         Catastrophic                  Low
    Shallow slumping of surface soils           Unlikely                 Minor                     Low



4.0 Geotechnical Comments
Geotechnical comments are based on the factual findings of the investigation, best practice,
local experience, published correlations; however, are fundamentally founded in opinion and
this should be considered.

5.1 Earthworks Comments
The following comments are provided in relation to site preparation for earthworks.




29 Apr 2020                                                                Proposed Residnetial Dwelling