Slope Stability Report - 22072-001-Rev0

H.M de Groot                                                                                    22072-001-Rev0
                                                                                                 21 March 2022

structures or fill batters and not as concentrated discharge upslope of any neighboring
structures/embankments. The platform should be graded slightly (minimum 1V:100H) back ‘into’ the
exposed rock batter slope to drain appropriately to the diversion drainage system and not allow over topping
of the downslope fill batters.
Subsurface drainage must be installed behind any retaining walls (e.g. slotted ‘aggi’ pipe wrapped in filter
‘sock’ placed in gravel backfill). Depending on matters such as the extent of drainage installed and site-
specific groundwater conditions, the designer must make an assessment of hydrostatic pressure to be
accounted for in the design of the retaining structure.
It would be prudent to construct a rock dissipator or rock contour drain at the drainage outlet point(s) to
minimise erosion. Drains should be directed to discharge towards the natural drainage lines.
Subsurface disposal of stormwater must not be undertaken (including infiltration pits).


5.0     SUMMARY & CONCLUSIONS
Based on the findings of our assessment we consider that there would be a Low Risk of slope instability
affecting the proposed shed, subject to implementation of the recommendations given in this report.



6.0     LIMITATIONS
Your attention is drawn to the document Limitations, which is attached to this letter report.
Please contact the undersigned should you wish to discuss any of the above matters.
Yours faithfully,

TECTONIC GEOTECHNICAL PTY LTD




Jarrad McVey BEng (Civil) (Hons)                           Ashley Davey RPEQ 8159
Geotechnical Engineer                                      Director/Principal Geotechnical Engineer


Attachments: Qualitative Terminology for Use in Assessing Risk to Property
             Some Guidelines for Hillside Construction
             Limitations




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