REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                        Provide detail on the                • Review selected information sources and identify/confirm AEC
                        identified AEC including             • Excavate 75 test pits (TP1 through TP75) for visual and olfactory
                        the location, type and                 observation, field screening for landfill gas and collection of soil
                        volume of                              samples directly into laboratory supplied jars
                        contamination                        • Record lithology to map any areas of concern
                                                             • Select primary and quality assurance (QA) samples for National
                                                               Association of Testing Authorities (NATA) accredited laboratory
                                                               analysis of selected soil samples for various parameters including:
                                                               - Asbestos (in soil and in bulk materials)
                                                               - Heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn)
                                                               - Organochloride and Organophosphorus Pesticides (OCP/OPP)
                                                               - Polycyclic Aromatic Hydrocarbons (PAH)
                                                               - Polychlorinated biphenyls (PCB)
                                                               - Total Recoverable Hydrocarbons (TRH) / Benzene, Toluene,
                                                                   Ethylbenzene, Xylenes and Naphthalene (BTEXN)
                                                               - Per- and polyfluoroalkyl substances (PFAS)
                                                               - Semi Volatile Organic Compounds (SVOC).
                                                               - Background sample for NEPM derivation of selected site criteria.
                                                            •     Install 4 groundwater monitoring bores with 1 monitoring round
                                                            •     Install 7 landfill gas (LFG) monitoring bores with 1 monitoring round.
                        Identify any areas of                • Review information collected (Sections 6, 7, 8 and 0)
                        uncertainty
                        Provide an assessment                • Complete a CSM.
                        of site contamination                • Assess potential risks (Section 0) by considering source1 – pathway –
                        related Risks                          receptor relationships for identified sources and potential receptors.
                                                               As a screening level assessment, the Site Contamination Risk
                                                               Equation (SCRE) is used:
                                                                                    Source x Pathway x Receptor = Risk
                                                                  Each variable can have the following values:
                                                                  1 = Exists
                                                                  0 = Does not exist2
                                                             •   If any of the variables have a value of 0 then the Risk is also 0 or low
                                                                 risk.
                                                             •   Evaluate the risk of undetected contamination based upon either an
                                                                 area-based or volume-based assessment, and how this may affect the
                                                                 SCRE.
                        Determine if                         •   Where potentially unacceptable (subjective) risks exist, determine
                        management or                            measures to alter the source-receptor-pathway relationship to reduce
                        remediation measures                     these risks.
                        are required to make the             •   Where there are other fixed proposed site uses (fixed receptors)
                        site suitable for the                    remedial or management measures involve the modification of the
                        proposed use and                         pathway and source variables (Section 10).
                        define these measures.


                    1
                        A source is considered to be a potential source of a hazardous contaminant(s).
                    2
                        In practical terms it is not possible to assess source related hazards to a level where they can be stated to be as being non-
                         existent and some residual hazard that may result in a risk may remain. Non-existent is intended to mean low risk.



        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                                    Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                                10                                  Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900