Further Advice Response

Item 9

Provide comment from Tectonic certifying that the proposed location of the infiltration
trench is suitably setback from the crest of the dune slope.

Response: Please refer to the below response from Tectonic:

   We understand that all collected roof water will be discharged by pipes into the existing stormwater
   system along the road reserve, with stormwater collected around ground level hardstand areas to be
   discharged in a soakage trench along the eastern edge of the residence. This is in general
   accordance with the recommendations of our geotechnical report (Ref. Tectonic Document No.
   22484-001-Rev0, dated 24 February 2023) and the location of the soakage trench is acceptable from
   a slope stability viewpoint.

   It is noted that Tectonic must review the detailed design drawings prior to construction to confirm all
   our recommendations are adhered to.

Item 10

Provide an amended Stormwater Management Plan (S22-174-SW01) that addresses
Council’s concerns. The amended plan must be prepared by a suitably qualified person
(RPEQ – Registered Professional Engineer of Queensland) and include, but not be limited to:

   a. a grated drain, demonstrating where any future grated drain will discharge to;
   b. demonstrate the proposed kerb adapters can discharge via gravity to The Esplanade by
   achieving a minimum grade of 0.5%; and
   c. demonstrate the discharge rate of the proposed kerb adapters during up to, and
   including, the 1% AEP event.

Response: Please refer to the revised Engineering Plans and revised Stormwater Management Plan
prepared by Westera Partners. The changes include:

   ●     A grated drain and discharge point;
   ●     Proposed kerb adaptors, which can discharge via gravity to The Esplanade, and achieving a
         minimum grade of 0.5%; and
   ●     Demonstration of the discharge rate of the proposed kerb adopted during, up to and including
         the 1% AEP event.

FURTHER ADVICE RESPONSE DATED 27 SEPTEMBER 2023

Item 1

The applicant is invited to provide additional information which would support acceptance of
the lesser width in the context where preliminary assessment by Council indicates that the
BMT values are supportable.

Response: The response letter prepared by Royal HaskoningDHV will be provided under separate cover.
This updated report has been prepared to address the latest proposal plans and engineering design as
attached.

Item 2

Provide assessment against the above mentioned outcome.



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