RFI - Attachment C - Slope Stability Assessment and Geotechnical report · MCU20/0026

Project No. 1-22543                                                                                                               Page | 22
June, 2020
Ref: 1-22543, 2020-05-20, BR SSA VER 1
Sanya Holdings – Slope Stability Assessment and Geotechnical Report - Proposed Residence, 40 Park Crescent, Sunshine Beach




Underground Services

Where footings are located adjacent to underground services, the footings should extend to
base a minimum of 200mm below the trench base level for a distance of 1.0m out from the
trench. Beyond 1.0m the footings should be taken a minimum of 200mm below an imaginary
line drawn up at 450 from the trench base level. Figure 4 refers. These requirements do not
override minimum footing levels.




                                            Service Trench                                                   1

                                                      or                                              1

                                            Retaining Wall                                                        200mm




                                                                                                                  Found footings
                                                                                    1.0m                          Below these lines


                                                                                   200mm


                                                                    FIGURE 4

           6.2.8       Site Management

It is important that proper site management methods be observed for the existing soil conditions
by both the builder at the time of the construction and the owner throughout the life of the
proposed development.

Particular reference to this is set out in AS 2870-2011. It should be noted that where proper site
management, particularly with respect to change in moisture conditions, is not followed, the
foundation recommendations contained in this report could be considered void.

The following are some specific comments with respect to site management and the reader is
also directed to CSIRO pamphlet, 10-91, ‘to Home Owners on Foundation Maintenance and
Footing Performance’ for further information:-

                It is important that the site be well drained. The ground around the building should
                 slope away at 1 in 20 for 2 metres and then fall to the stormwater system to prevent
                 ponding of water adjacent to the building.
                Roof downpipes and garden taps should not be allowed to saturate founding soils.
                Footings should be placed with minimal delay after excavation to avoid desiccation
                 or wetting of the founding soils. If footings cannot be poured on the same day as
                 excavation, a blinding layer of 50mm thickness is recommended. Piers should be
                 poured immediately following excavation.
                Do not let the slab subgrade "dry out" prior to casting.


                                                                                                               SOIL SURVEYS