Changes Application - MCU15/0023.02

Project No. 112-14608
January, 2013   REF: 1-14608, 2013-01-15, BR VER O.                                           Page 10

   4.4   Building Foundations

      Due to the potential long term creep movement associated with sloping sand sites, it is
      recommended that a stiffened raft type footing and slab system be adopted, supported on
      deep and high level footings as appropriate. Alternatively, the entire structure should be
      founded on deep footings extending to found in the medium dense to dense sands.
      Outdoor deck and pool structures on the eastern side of the house should be supported
      on deep foundations.


      It is recommended that all footings extend to a depth below a 25 degree line from the toe
      of the slope, and into medium dense sands (as a minimum). Therefore structures located
      at the top of the crest of the slope will require deep foundations (eg. to a minimum depth
      of 4.0m at BH2, with this depth likely to increase to the east of BH2). Structures located
      further away from the crest of the slope and behind the 25 degree line maybe founded on
      high level footings.


      The location of the 25 degree line on the ground surface should be established by survey
      prior to detailed design and construction.




                                                SLOPE CREST




                                                      _-----~         250EGREELINE
                                                                      ALL FOOTINGS BELOW
                                                                      THIS LINE
                                                                      PILEO FOUNOATIONS AT
                                                EXISTING GROUND       LEAST 1,OM BELOW THIS
                                                SURFACE               LINE
                BEACH




                                                                                 FIGURE 2



      4.4.1     Site Classification

      The investigation      encountered   only sandy materials, which are non-reactive,         and
      therefore ground surface movement due to variation in the soil moisture would not be
      expected to occur. On this basis, the site may be designated Class 'A' in accordance
      with AS.2870.1-2011 'Residential Slabs and Footings'.



                                                                #- SOIL SURVEYS ENGINEERING