REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                      5.3   Confirm that measurement detection will           Samples will be collected and submitted to
                            allow reliable comparisons with the action        NATA accredited laboratories. The laboratory
                            level.                                            analytical LORs are expected to be below the
                                                                              adopted criteria.

                                                                              Other sampling using field equipment is to be
                                                                              performed using fit for purpose and properly
                                                                              calibrated instruments, such as for vapour (PID)
                                                                              or landfill gas (LFG meter).
                      5.4   Combine the outputs from the previous             Where unacceptable wastes exists or statistical
                            DQOs steps and develop an “if ..., then ...,      parameters of the data for soil, fill, waters or air
                            else ...” theoretical decision rule based on      exceed the assessment criteria, then the data
                            the chosen action level.                          point will be considered contaminated and
                                                                              requiring remediation or further justification via
                                                                              further assessment, statistical analysis or risk
                                                                              assessment with respect to the proposed land
                                                                              use.
                      6     Specify performance or acceptance criteria – to specify probability limits for false rejection and
                            false acceptance decision errors.
                      6.1   Specify the decision rule as a statistical        Null hypothesis is that no unacceptable waste or
                            hypothesis test.                                  contamination impact is observed, and the
                                                                              media sampled is not contaminated above
                                                                              criteria (or otherwise can be remediated to an
                                                                              appropriate level).

                                                                              Note that as the land is required to be listed on
                                                                              the EMR, additional assessment to the
                                                                              appropriate resolution for all relevant media, as
                                                                              well as any required remediation, will be
                                                                              required to satisfy legislative requirements and
                                                                              the appointed contaminated land auditor to
                                                                              remove the land from the EMR.
                      6.2   Examine consequences of making incorrect          Possible decision errors include:
                            decisions from the test.
                                                                              Stating that no wastes exist or classifying media
                                                                              as clean and determining the risk to receptors
                                                                              as low when in fact significant risk exists.

                                                                              Incorrectly stating that wastes are unacceptable
                                                                              or classifying media as impacted resulting in
                                                                              overstated risks and potentially unnecessary
                                                                              remediation.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                   Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                       35                          Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900