Slope Stability Report (4) · EXE22/0020

Specialists in transport geotechnics

  Table 6: Results of Qualitative Assessment of Risk to Property - With Engineering Controls
                                                                              With Engineering Controls
                Engineering Controls to Reduce Risk                                Likelihood of
                                                                Consequence                          Qualitative Risk
                                                                                    Occurrence
         -   Provision for good drainage and erosion
             control measures i.e. surface water interceptor
             drains and flow spreaders.                            Minor               Rare
         -   Monitor retaining walls and related drainage.
         -   Structure piers to be founded in dense                                                       Very Low
             underlying soils
         -   Monitor pool for potential leaks into underlying
             soils


         -   Monitor existing structures for movement and
                                                                  Medium               Rare                 Low
             ensure excess runoff and current drainage
             remains operational


4.2 Effects of Development on Land Stability
4.2.1 Existing Conditions
Existing conditions are discussed in section 3 above.

4.2.2 Effects
Based on observations made in the field, the effect on land stability due to the proposed
development is considered to be low should good construction practice be followed during
construction.
Site drainage around the development in the form of swale drains to minimise effects of erosion
should be included.



5 PROPOSED DEVELOPMENT IMPACT ASSESSMENT

5.1 Site layout
Please refer to Appendix 1 for the layout and contour plans.

5.2 Proposed development components
The proposed development at 24 Lyrebird Court, Peregian Beach involves the addition of a spa
and deck to an existing dwelling and pool area.

5.3 Earthworks
Based on the development plans provided it there is minimal earthworks required for the
construction of the spa and deck extension which is to be founded above ground on piers.
Should earthworks be required it is recommended that the fill operations be undertaken with the
appropriate engineering supervision to ensure compaction is achieved. Any fill batter on the down
slope side of the house will require appropriate batter angles/retention systems to ensure the
stability of the fill platform and foundations.




9 August 2022                             CGC-SR-2022-012-R01-Rev01                                       Page 13