1-22276-01 site plan

Project No. 1-22276                                                                                                                  Page | 9
February, 2020
Ref: 1-22276, 2020-02-28, BR VER 2
Wessel Petroleum Pty Ltd – GEOTECHNICAL INVESTIGATION - Proposed Service Station Reconstruction, 52-54 Mary Street and Weyba Road,
Noosaville




Preliminary Screening Tests - Qualitative

Testing was carried out on representative soil samples recovered from the boreholes to provide
preliminary qualitative assessment of the presence of acid sulfate soils (ASS). This testing was
in the form of assessing the pH of the sample before and following oxidation with 30% hydrogen
peroxide (H2O2). This test involved measuring a known quantity of soil sample from a particular
depth in the strata; the field pH (pHF) of the sample was then measured and recorded.
Following this, a uniform volume of hydrogen peroxide was then added to the sample. Each
sample was left to react / oxidise for 1 hour and the pH following oxidation (pHFOX) was
recorded.

This is a quick, qualitative assessment of the potential acidity of the soil. Reactivity to
hydrochloric acid (HCI) was also assessed as a qualitative determination of the neutralising
carbonate content including calcium carbonate (shells) within the soil. The results of these
screening tests were used as an additional tool in determining which soil samples should be
further assessed by quantitative laboratory testing.

Laboratory test results are summarised in Table 1B with certificates containing qualitative test
results of pHF and pHFOX are attached.

TABLE 1B    QUALITATIVE SCREENING TEST RESULTS
   Borehole No.        Depth Range (m)                   pHf                                                                  pHfox
                          0.11 – 1.75                5.1 – 6.6                                                              4.3 – 6.2
        1                 1.75 – 3.20                4.9 – 5.5                                                              1.6 – 2.7
                          3.20 – 4.50                5.5 – 5.6                                                              4.3 – 5.4
                          0.00 – 1.50                5.3 – 7.7                                                              5.3 – 6..7
        6                 1.50 – 2.25                6.4 – 6.6                                                              2.6 – 3.7
                          2.20 – 6.00                6.0 – 6.5                                                              4.6 – 5.9
Where:
   Depths in metres below surface level at date of drilling
   pHf = pH of sample/s taken from field
   pHfox = pH of sample/s following oxidation


Quantitative Tests

Based upon the results of the screening tests, samples were selected for quantitative analyses,
SCr (Chromium Reducible Sulfur) and TAA (Total Actual Acidity), in accordance with
appropriate laboratory procedures. The TAA is a measure of the soils existing acidity prior to
oxidation of sulfidic material

Table 1C presents a summary of quantitative test results. Laboratory test certificates are
attached.




                                                                                                            SOIL SURVEYS