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




The following are items that may affect the site and as a result change the site classification to
a “Class P”.
•   Excessive moisture as a result of poor drainage, maintenance to drainage structures,
    excessive watering of gardens;
•   Placement or removal of vegetation that draws moisture from the soil surrounding the
    structure; and
•   Additional earthworks outside the limitations set out in AS2870.


Long term maintenance is typically required for sites for maintenance. Useful information is
attached which should be read and understood by both the builder and property owner.


5.3 Foundations
It is recommended that all high level footings have perimeter, column and load bearing
footings found a minimum 0.3 m into medium dense sands. Where footings found into at this
depth and into this material they can be sized and dimensioned for 150 kPa. All foundation
excavations should be inspected by a suitably experienced and qualified geotechnical engineer
prior to the placement of concrete to confirm ground conditions. Further to this, all footings
should found in similar strata to limit differential settlement.


5.4 Hillside Construction
The following precautionary works should be implemented in additional to other items
highlighted within this document. These points are considered to be typical good hillside
construction practice as explained in attached documentation:

•   Foundations for lightly loaded or non-liveable structures should be founded on or in
    medium dense sands; Heavy structures should be supported on either piles founded into
    medium dense sands or high level footings founding into the same material.
•   Where slopes are not supported by an engineer designed support system, natural slopes
    within or near building envelope or movement sensitive areas should be no steeper than
    3.5H:1V.
•   Building platform fill should be limited to a maximum height of 1 m. The filling should be
    step keyed into the natural slope and battered no steeper than 3H:1V unless an engineer
    designed retention system is in place.
•   Unsupported cuts steeper than 2.5H:1V will require engineer designed retention systems.
•   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.




29 Apr 2020                                                         Proposed Residnetial Dwelling