MCU21 0146 Stockwell_Information Request Response Letter · MCU21/0146

9 Issue

The development proposes to address stormwater quality primarily through the provision of 2
bioretention devices comprising a total of 125m? of filter area. This is in line with expectations.

The levels shown on the sketch plans are however very tight to allow the systems to function.
Saturated zone bioretention should be able to be made to work if the levels are correct. Survey
at the outlet is requested. Once detention storage is correctly accounted for the level
constraints will be exacerbated.

Information Required

12. Provide a revised SBSMP and revised preliminary engineering plans which address the
following issues:

a) Provide survey levels of the invert and standing water levels at the proposed outlet
locations from the site to Covenant J and demonstrate that the offsets specified in the
Bioretention Technical Design Guidelines (Water by Design) are achieved

b) Confirm the extended detention depth assumed for the bioretention devices in the
MUSIC model

c) Confirm the type of bioretention systems proposed (conventional, bio-infiltration,
saturated zone)

d) Provide preliminary design sections for the bioretention systems, showing layers, ED,
outlet levels and interaction with detention storage

Response
Refer to attached engineer's cover letter, drawings, and updated report.

40. Issue

A review of the Acoustic Logic noise report dated 16 August 2021 has been undertaken. The
Acoustic Logic report does not provide adequate information to support the noise predictions
prepared using noise modelling. Further the report is confusing in the actual noise treatments
necessary, with options provided for glazing — ie if Noosa Civic Plant is acoustically treated or
not. There are matters which require further clarification and on this basis the following is
requested:

Information Required

13. Provide details on the inputs to the road traffic noise modelling, including traffic flow
rates, vehicle speeds, commercial vehicle component.

14. Provide validation of the traffic noise modelling to the measured road traffic noise levels.

15. Provide tabulated noise results at residential unit facades for day/Evening and Night
periods.

16. Provide the required acoustic rating of fagade elements to comply with road traffic noise
for day/evening and night periods to comply with the Table 10 Noise Limits

17. Provide details on the inputs to the mechanical plant noise modelling including source
sound power levels and operating times for all plant items considered.

18. Provide clarification of why there are no predictions provided for night time mechanical
plant noise.

19. Provide clarification as to whether the acoustic design proposed for residential units is
reliant upon windows and doors to be closed at all times for internal noise criteria to be
achieved.

20. Please advise whether mechanical ventilation/air conditioning is proposed to ail noise
affected units on the basis if external doors and windows have to be closed.

21. Provide clarification on whether acoustic mitigation works identified in Section 8 for the
Shopping Centre will be implemented.

 

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