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RESPONSE TO FURTHER ADVICE -Engineering Response · MCU25/0054
31 July 2025
SCG Ref: 0461(L1) SCG Consulting Engineers
ABN 68 669 675 790
By email: [email protected]
Unit 1/11 Project Avenue,
Noosaville QLD 4566
Ross Palazzesi
P: 07 5455 5604
E: [email protected]
Dear Ross
Re: MCU25/0054 & OPW25/0077 ~ 20 William Street Noosaville
We have reviewed Noosa Council’s request for information dated 24th July 2025 and provide our response to the
Engineering related items.
Issue: 6 - Dewatering
The proposed earthworks plan notes the site is to be constantly dewatered until the ground
level suspended slab is poured and cured. A dewatering plan is referenced on this plan as
being available upon request.
Information Required
Provide dewatering plan for Council review.
Response:
Please find attached the Dewatering Management Plan (DMP) prepared by ADG for Council’s review.
We note that, due to the limited geotechnical investigation undertaken to date (as a result of access
constraints), further subsurface testing will be conducted following demolition of the existing structure. This may
result in refinements to the current dewatering strategy.
We request that Noosa Council accept the submitted DMP for preliminary assessment, with a commitment to
provide an updated plan incorporating additional geotechnical data prior to the commencement of basement
excavation works.
Issue: 7 - Stormwater
The Stormwater Management Plan for the basement level includes a pump system. Council
has concerns how stormwater will be managed in the event of a pump malfunction.
Information Required
In accordance with QUDM 7.2.3 address how a major (1% AEP) event will be managed
in the event of a pump malfunction.
Response:
As detailed in the submitted Stormwater Management Plan (SCG Drg. No. 0461-SW1.1), the basement
drainage system has been designed in accordance with QUDM Section 7.2.3 to include appropriate redundancy
measures.
A secondary pump and a backup power supply will be provided to manage stormwater in the event of a primary
pump failure or power outage. This approach aligns with accepted engineering practice and is consistent with
prior development approvals in similar basement configurations.
These provisions ensure continued functionality of the stormwater system during a major (1% AEP) storm
event, thereby mitigating flood risk associated with pump malfunction.
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Issue: 8 – Acid Sulfate Soils
The site is subject to the Acid Sulfate Soils Overlay, the Earthworks Plan notes the earthworks
balance is 327.52 m³ in cut below 5m AHD.
Information Required
Provide an Acid Sulfate Soils Overlay Code assessment and management plan.
Response:
Please find attached the Geotechnical Investigation Report prepared by PTG Consulting, which includes Acid
Sulfate Soils (ASS) laboratory testing results. The investigation confirms the presence of potential acid sulfate
soils within the proposed excavation zone below 5.0 m AHD.
Due to access constraints associated with the existing building, testing was limited to hand auger methods. We
confirm that additional ASS investigation and verification sampling will be carried out following demolition, once
full site access is available.
A preliminary assessment against the (ASS) Overlay Code has been undertaken, and an appropriate
management approach will be refined based on further testing. We request that Noosa Council accept the
current submission, with a commitment to provide updated ASS management details prior to the
commencement of basement excavation works.
Issue: 9 – Reference Document
The Planning Report (4.5 Works and Overlay Codes) notes a Geotechnical Report is included.
This document has not been received.
Information Required
Provide the Geotechnical Report for Council review.
Response:
Please find attached the Geotechnical Investigation Report prepared by PTG Consulting.
Due to access limitations associated with the existing building, the investigation was undertaken using hand
auger techniques to obtain preliminary subsurface data. We note that further geotechnical testing and
assessment will be carried out following demolition, once full site access is available.
We request that Noosa Council accept the current report for preliminary review, with a commitment to provide
an updated and comprehensive Geotechnical Report prior to commencement of basement excavation works.
If you require any further information, please do not hesitate to contact our office.
Yours faithfully
TOM HARRINGTON – RPEQ 27698
For and on behalf of
SCG CONSULTING ENGINEERS
Enc Geotechnical Investigation Report Prepared by PTG, Report No.PTG/02023-0001-Rev1 dated
28.04.25
Dewatering Management Plan Prepared by ADG, Report No.ADG1808.25 dated 7.05.25
SCG Consulting Engineers Page 2 of 2 SCG Ref:0461(L1)
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