RFI - Attachment E - Acid Sulfate Soil Management Plan · MCU25/0053

1      REPORT SCOPE
This report presents the Acid Sulfate Soil Management Plan produced for the proposed residential development at 7 Noosa
Parade, Noosa Heads (the ‘site’).

The work was commissioned by SCG Consulting Engineers Pty Ltd (the ‘Client’).

Please note that a geotechnical investigation including Acid Sulfate Soil (ASS) investigation has also been produced and it is
recommended that the following document is read in conjunction with this report:

»   ‘Geotechnical Investigation Report – Proposed Residential Development – 7 Noosa Parade, Noosa Heads’, Document ID
    PTG/01608-0001-Rev 0, dated 28/02/25 (herein referred to as the ‘PTG Geotechnical Investigation Report’)

The PTG Geotechnical Investigation Report included a field investigation and laboratory testing of selected samples undertaken
in general accordance with PTG’s proposal PTGT/01451/Rev 0. Please refer to this report for information regarding site
description, borehole locations, borehole record sheets, and laboratory test results. It is intended that this Acid Sulfate Soil
Management Plan and report is read in conjunction with the PTG Geotechnical Investigation Report.

This Acid Sulfate Soil Management Plan and report includes a summary of the subsurface profile information and laboratory
test results from the PTG Geotechnical Investigation Report, which was based on the drilling of four boreholes to a depth of
4.5 m.

The results of the PTG Geotechnical Investigation Report indicated the presence of Acid Sulfate Soil (Potential Acid Sulfate Soil).
On this basis, an Acid Sulfate Soil Management Plan is required.

This Acid Sulfate Soil Management Plan and report has been produced in accordance with the following documents:

»   Noosa Plan 2020 Acid Sulfate Soils Overlay Code;
»   National Acid Sulfate Soils Guidance – National Acid Sulfate Soils Sampling and Identification Methods Manual, June, 2018
    (Australian Government Department of Agriculture and Water Resources, Canberra ACT. CC BY 4.0) (herein referred to
    as the ‘Acid Sulfate Soils Sampling and Identification Manual’) ;
»   Queensland Acid Sulfate Soil Technical Manual – Soil Management Guidelines Ver 5.1 (Department of Resources and
    Department of Environment, Science and Innovation, Queensland, 2024)

2      PROJECT DESCRIPTION
Based on the information provided by the Client, it is understood that the proposed development will include the excavation of
a single level basement over an area of 471 m2 with two residential levels above ground.


3      SUBSURFACE CONDITIONS
The subsurface conditions in the PTG Geotechnical Investigation Report boreholes beneath the paver surface typically
comprised silty sand fill extending to the termination depths of 4.5 m.

Groundwater seepages were not encountered in the boreholes. However, as a precaution, information regarding groundwater
management is included in the Acid Sulfate Soil Management Plan.

The presence and depth to groundwater is dependent on the Noosa River water level, rainfall and subsurface material type and
permeability.

4      LABORATORY TEST RESULTS
The laboratory test results from the PTG Geotechnical Investigation Report included both pH screening and Chromium
Reducible Sulfur tests.

The results of the pH screening tests typically indicated the presence of Acid Sulfate Soils (Potential Acid Sulfate Soils) in several
samples.

On this basis, Chromium Reducible Sulfur tests were carried out.

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