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

Project No. PG-9236                                                                                                                Page | 3
November 2022
Ref: PG-9236, 2022-11-01, ASSMP VER 1
Looroo Property Trust – Acid Sulfate Soil Management Plan – Proposed Residential Development, 128-132 Gympie Terrace, Noosaville




                                       •     Treated at an off-site facility in accordance with the approved
                                             ASSMP for the facility.
Performance                            ASS
Indicators                             Chromium Suite testing carried out for validation of applied liming
                                       rates will be deemed to be acceptable if the net acidity recorded is
                                       18mol H+/tonne.

                                       Water
                                       Laboratory testing of retained water will be carried out for pH,
                                       electrical conductivity (ED), iron (Fe), aluminium (Al), dissolved
                                       oxygen and turbidity. Levels of these parameters considered
                                       acceptable are as follows:

                                       pH                              6.5 to 8.5 pH units
                                       EC                              <1,500 S/cm
                                       Fe                              <1,000 ug/L
                                       Al                              <5.0 ug/L if pH <= 6.5 pH units
                                                                       <100.0 ug/L if pH > 6.5 pH units
                                       Turbidity                       <20NTU
                                       Dissolved Oxygen                >80% saturated

                                       Testing for the Fe and Al will only be necessary if the pH of the water
                                       falls below pH 6.0.
Frequency/Timing                       ASS
                                       The sampling and testing of any lime treated material will be subject
                                       to QA testing, which will be repeated until satisfactory results are
                                       obtained. Chromium Suite validation testing will be carried out at a
                                       rate of 1 test/250m3 of treated spoil.

                                       Water
                                       The following monitoring frequency is recommended during
                                       dewatering operations (if required):
                                       • daily measurements of pH, dissolved oxygen (DO), turbidity and
                                          suspended solids; and
                                       •     weekly measurements of the full list of Performance Indicators
                                             nominated above (if dewatering has been required).
                                       If the results of monitoring prove consistent, the frequency of
                                       monitoring may be reduced, subject to the approval of the ASS
                                       Consultant.
Corrective Action                      ASS
                                       If lime treatment of ASS is unsuccessful, whereby performance
                                       targets are not being met as indicated by the QA and water quality
                                       testing procedures:
                                       • The earthworks schedule will be reassessed and action taken to
                                            determine the problems causing the breach of standards.
                                       •     If the problems are related to ineffective implementation of the
                                             ASSMP, then the plan will be audited to ensure improved
                                             implementation. Monitoring and testing will be increased to
                                             ensure compliance with the established standards.
                                       •     Any significant changes to the ASSMP will be subject to
                                             discussions with and the approval of, the relevant regulatory
                                             authorities.