PG-9236, 2022-10-31, Asr Ver 1

 Project No. PG-9236                                                                                                              Page | 5
 November, 2022
 Ref: PG-9236, 2022-10-31, ASR VER 1
 Looroo Property Trust – Acid Sulfate Soil Investigation - Proposed Residential Development, 128-132 Gympie Terrace, Noosaville




TABLE 1                             SUBSURFACE PROFILE SUMMARY

                                                                                  NATURAL
                                                                       SAND                                            CLAY
    BH No.                   FILL                                                                                                 BH TD
                                                Loose to                       Indurated Dense                       Stiff to
                                              Medium Dense                       to Very Dense                      Very Stiff
      BH01                0.0-1.1                     1.1-2.7                          2.7-3.2                        3.2-TD       4.0
      BH02                0.0-1.1                     1.1-2.9                          2.9-3.3                        3.3-TD       4.0
      BH03                0.0-1.1                     1.1-2.9                          2.9-3.3                        3.3-TD       9.0
      BH04                0.0-1.1                     1.1-2.5                          2.5-2.8                        2.8-TD       9.0

Notes:
1. All depths in metres below ground level at time of investigation.
2. TD - Termination Depth.

Groundwater was noted in both of the boreholes at a depth of 1.0m and 1.1m at the
time of drilling in the boreholes. Water levels can be expected to vary with seasonal
and climatic conditions.

Increases in the groundwater levels often occur following significant rainfall events
(floods).

5.0 LABORATORY TESTING

Laboratory testing was undertaken in general accordance with the
recommendations outlined in the QASSIT 'Acid Sulfate Soils Laboratory Methods
Guidelines 2004'. The results of the testing program are appended to this report.

The testing program comprised of initial screening tests on recovered samples,
followed by quantitative testing using the Chromium Reducible Sulfur (CRS) suite.

Screening Tests

Screening tests were undertaken on each soil sample collected from the bores. Two
small sub-samples of each soil sample were prepared; one sub-sample from each
sample was mixed with approximately 20mL of distilled water, and the other sub-
sample mixed with approximately 20mL of hydrogen peroxide (H2O2), buffered to a
pH of 5.4 with sodium hydroxide.

Slurry pHs were measured with a calibrated pH meter. The pH of the distilled water/soil
slurry (pHF) was measured approximately one hour after mixing, whilst the pH of the
hydrogen peroxide/soil slurry (pHFOX) was measured approximately one to two hours
after mixing.

The pH screening tests can be used for the preliminary identification of a potential or
actual ASS using a combination of three trigger factors as follows:

     a) The strength of the reaction with peroxide is a useful indicator but cannot be
        used alone. Organic matter and other soil constituents such as manganese
        oxides can also cause a reaction.