07/2399 - Referral Agency Response - DNRW (Concurrence & Advice) [As Published] · 132007.2399

If the disturbance of ASS cannot be avoided, the potential impacts of that disturbance
must be treated and managed to:
e neutralise existing acidity and prevent the generation of acid and metal
contaminants; and
e avoid releasing surface or groundwater flows containing acid and metal
contaminants into the environment.

The following advice is offered on whether the application demonstrates that the
proposed development can achieve Outcome 1 of SPP 2/02. .

Background

ASS mapping’ shows part of the site in an area mapped as likely t to contain ASS, with
the remainder low probability. Geology mapping shows the site as quaternary coastal
wetlands. Surface elevations range from 1.5m to 9m AHD.

The planning reports states that excavations below 5m AHD are not anticipated,
however they are not able to rule this out due to exact details only being known once
Council have approved and conditioned the application. Accordingly, they request
that preparation of an ASSMP be imposed as a condition.

The Engineering Report states that filling of the south west corner of the site will be
required, with minimal earthworks in the remainder of the site to provide the cut to fill
earthworks for the new roadworks profile, and infrastructure trenching.

A lake appears to be proposed as part of the realignment of the 18" tee.

ASS Investigation Report

The following advice is offered on the preliminary ASS investigation undertaken iby
Golder Associates and dated October 2007. NRW notes that the report is
preliminary due to details of the proposed earthworks and buildings were not known
at the time of reporting.

The ASS investigation revealed the presence of ASS in the southwest corner of the
site.

With respect to SPP 2/02 and related guidelines’, the ASS investigation is deficient in
the following areas:
e the number of boreholes — 2 were tested as part of the ASS investigation
- instead of 6;
e the number of samples analysed - 6 in the two boreholes, instead of 6 per
borehole.

NRW support the proposal to drill 4 additional boreholes once more detailed
information is available on the proposed development.

In order for the ASS investigation to be consistent with SPP 2/02 and related
guidelines, NRW recommend further ASS investigations which address the
deficiencies detailed above.

‘ Acid Sulfate Soils - Tweed Heads to Nerang River. NR&M, 2003

> NR&M & DLGP, (2002) State Planning Policy 2/02 Guideline

Ahern CR, Ahern MR and Powell 8 (1998). Guidelines for Sampling and Analysis of Lowland Acid Sulfate Soils
(ASS) in Queensland. Department of Natural Resources, Indooroopilly.

Ahern CR, McElnea AE and Sullivan LA (2004). Acid Sulfate Soils Laboratory Methods Guidelines. In Queensland
Acid Sulfate Soils Technical Manual. Department of Natural Resources and Mines, Indooroopilly.

Dear SE, Moore NG, Dobos SK, Watling KM and Ahern CR (2002). Soil Management Guidelines. In Queensiand
Acid Sulfate Soils Technical Manual. Department of Natural Resources and Mines, Indooroopilly.

Dear SE, Moore NG, Watling KM, Fahl D and Dobos SK (2004). Legislation and Policy Guide. In Queensiand Acid
Sulfate Soils Technical Manual. Department of Natural Resources and Mines, Indooroopilly,

The Department of Natural Resources and Water ICO108NAM0002 . 20f5