Appendix4-SlopeStabilityAssessment · MCU18/0135

Lab Results/Predicted Surface Movement

Bore Hole                                     N/A

Shrink-Swell                                  N/A

Ys                                            N/A

Existing Retaining Walls

Nil

Site Description

Future Site Works: Unknown
Existing Earthworks: Nil
Vegetation: Heavily grassed, scattered small to medium sized trees
Slope: 12-20%
Allotment Type: Residential
Surrounding Allotments: Road to the right,vacant to the left and a bushland reserve to the
rear.
Surface Water: Surface water from adjoining allotments will traverse this site.
Watercourses: Nil
Road Status: Sealed

Important Notes

*Earthworks could affect the site classification and or founding depth.
*If any fill is placed on the allotment post investigation the founding depth will change, furthermore
placement of reactive fill may change the sites classification.
*All top soil and vegetation is to be removed.
*Surface water is to be diverted away from structure.
*Do not plant trees near the structure which could interfere with the footings performance.
*It is the owner’s responsibility to read and understand the CSIRO BTF 18 Foundation Maintenance
and Footing Performance: A Home-owner’s Guide.
*Strength of founding material can be highly variable dependent upon moisture content.
*This investigation undertaken consisted of 2 boreholes only, given the size of the site it is possible
that a problem could have been missed. eg. Filled dam/gully, soft soils, fill, springs, boulders, rock
etc. We cannot give a definitive assurance that none of these problems exist on the site unless we
did a greater number of boreholes which would be uneconomical and impractical.
*This report may not provide all necessary information to design an adequate footing system, further
investigation may be required using larger drill rigs and/or different testing methods.

Trees

Unless otherwise stated this report assumes that all trees near the site that could influence the
performance of the footings will be removed and/or will be allowed for in the designing engineers
design. Therefore, this report excludes the potential effect any trees nearby may have on the
structure.
Distance from proposed structure that trees can effect footings:
0.75 x 'h'        'M' sites
1.0 x 'h'         'H' sites
1.5 x 'h'         'E' Sites
'h' is the mature height of the tree. Where there are rows of trees the distance should be increased.
It is the designing engineer’s responsibility to calculate the yt and add it to the ys.