6. Noosa River DMP Ver0 (Combined)

 Project No. PG-5412                                                                                                     Page | 5
 January, 2023
 Ref: PG-5412, 2022-11-03, GR VER 3
 International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa




Summary

On the basis of the testing undertaken, all samples provided nett acidity values below
the QASSIT defined action criteria. Therefore, soils disturbed on-site do not require
treatment for acid sulfate potential.

The results of the laboratory testing are appended to this report.

The initial testing indicated an acid sulfate hot spot in the area of BH08. This additional
testing has confirmed the material initially encountered has either been naturally
scoured away or is of such an isolated volume so as to not be significant and acid
sulfate treatment will not be required.

It is possible that the material was related to sediment build-up at the outlet of the
stormwater drain but this is not considered to be an issue now.

7.0 LIMITATIONS

We have prepared this report for the Noosa River Dredging Program at Noosa River,
Noosa. The report is provided for the exclusive use of International Coastal
Management, for this project only and for the purposes outlined in the report. It
should not be used by, or relied upon, for other projects on the same or different sites
or by a third party. In preparing this report, we have relied upon information provided
by the client or their agents.

The results are indicative of the subsurface conditions on site only at the specific
testing locations. Subsurface conditions can change between test locations and the
design and construction should take the spacing of the testing and testing methods
adopted and the potential for variation between the test locations.

This is not to reduce the level of responsibility accepted by Pacific Geotech, but rather
to ensure that the parties who may rely on the information contained in this report are
aware of the responsibilities they assume in doing so.




P. ELKINGTON (RPEQ 7226)

For and on behalf of
PACIFIC GEOTECH PTY LTD