REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                        6.3   Place acceptable limits on the likelihood of    Analytical results of sampled media compared to
                              making decision errors.                         the assessment criteria, with statistical analysis
                              Methods to determine if sufficient numbers      or modelling as may be required, will determine
                              of samples have been collected, and to          if unacceptable contamination is present.
                              assess if the assumed hotspot size and          Observations of waste types and likely volumes
                              shape are justifiable, should also be           and comparison with assessment criteria and
                              documented.                                     guidance for classifying Regulated Waste and
                                                                              Notifiable Activities.

                                                                              Collection and analysis of samples in
                                                                              accordance with the first stage of the DSI
                                                                              sampling strategy as detailed within this SAQP,
                                                                              to at least the minimum sampling densities
                                                                              recommended by relevant guidance documents.

                                                                              Refer to Appendix B for more information on the
                                                                              stages of contamination assessment and
                                                                              Section 11 for the general limitations of
                                                                              contaminated land assessments.
                        7     Optimise the design for obtaining data – to identify a resource effective sampling and analysis
                              design for generating data that are expected to satisfy the DQOs.
                        7.1   Document the final sampling and analysis        See following Sections.
                              design, along with a discussion of the key
                              assumptions underlying this design.
                        7.2   Detail how the design should be                 See following Sections.
                              implemented, together with contingency
                              plans for unexpected events.
                        7.3   Determine the quality assurance and quality     See following Sections.
                              control (QA/QC) procedures that would be
                              performed to detect and correct problems to
                              ensure defensible results.
                        7.4   Document the operational details and            See following Sections.
                              theoretical assumptions of the selected
                              design in the sampling, analysis and quality
                              plan (SAQP).


        6.2.        SOIL OR FILL SAMPLING

        6.2.1.      RATIONALE
                    The soil and fill assessment effort was based on the following strategy presented within the PSI fee
                    proposal and subsequent DSI SAQP:
                    •       PSI soil sampling - 11 targeted locations based upon the two suspected waste disposal AEC as
                            identified by the desktop assessment (5 locations within AEC 1 and 6 within AEC 2) that included one
                            test pit that was extended into a 15m transect (being TP7) and one location where a background
                            NEPM sample was collected for derivation of relevant site-derived criteria, sourced from
                            representative natural soil at location TP4 at a depth of 1mbgl.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                 Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                     36                          Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900