Acid Sulfate Management Plan · MCU16/0103

FPE Ref: 4956-161019-1.0


3.0 SAMPLING METHODOLOGY
3.1 GENERAL
Excavations associated with the subject development are understood not to extend 1.0m below the existing
surface level.

For the purposes of this assessment, two boreholes were completed to a maximum depth of 2.0m in the
vicinity of the subject allotment.

The volume of excavation resulting from the proposed development works at the site is anticipated to be
greater than 100m3 at or below RL5.0m. Given the scale of the development, and proposed excavations
and filling below 5m AHD, an ASS investigation was considered necessary, and has been undertaken in
general accordance with Queensland Sampling Guidelines to determine whether the development will
impact on any ASS.

In accordance with the Guidelines for Sampling and Analysis of Lowland Acid Sulfate Soils in Queensland
(QASSIT, 1998), the extent of the borehole depths is considered to be of sufficient depth to identify potential
disturbance of AASS or PASS or potentially existing acidic material on site.

Based on the estimated volume of material requiring disturbance, the existing surface levels and
excavations proposed, and ASS mapping of the area it was determined that the potential to impact on any
AASS or PASS material is considered to be moderate.

A detailed site investigation and soil testing regime was undertaken to gain understanding of sub-surface
conditions and to confirm the outcomes of the desk-top study and preliminary site investigations.

3.2 SAMPLING LOCATIONS & METHODOLOGY
A total of two boreholes to maximum depth of 2.0m were advanced to generally satisfy the relevant
requirements.

Boreholes were advanced using a 4WD mounted solid flight auger at the approximate locations shown in
the Borehole Location Plan included as Figure 3 of this report.

Soil samples were collected at 0.25m intervals for the full extent in all boreholes.


3.3 FIELD PH TESTING
Field pH testing was undertaken for all samples collected. Testing included initial field pH tests (pHF), after
the addition of distilled water, to determine the presence of AASS, followed by field peroxide pH testing
(pHFOX) conducted after the addition of 30% hydrogen peroxide solution to test for sulfides or PASS.

          pHF: A result of pH <4 indicates oxidation has occurred in the past and that AASS is present.




October 2016                           Acid Sulfate Soil Investigation Report                               8
                                             New Duplex, Noosaville