REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                         149mg/kg (TP42-0.2) and 145mg/kg (TP13-0.1) that all exceeded ecological but not human health
                         SAC.
                    •    Mercury highest result of 216mg/kg in sample TP10-0.5 that in isolation exceeded SAC for ecological,
                         HIL A and HIL C, then 2mg/kg in sampleTP19-1.0 that was below SAC.

        8.2.5.      HEAVY METALS LEACHATES
                    After receipt of the initial laboratory results, follow up analyses were performed for Toxicity Characteristic
                    Leaching Procedure (TCLP) and Australian Standard Leaching Protocol (ASLP). TCLP tests are used for
                    waste classification purposes for off-site disposal of contaminated soils (acid leach mimicking landfill
                    conditions) and ASLP tests are used to assess the on-site leaching potential of wastes and contaminated
                    soils (neutral acidity leach simulating environmental water).
                    TCLP leachate results will be further discussed within documents for waste disposal and remediation
                    planning. The following ASLP testing was undertaken at the site:
                    •    Sample TP9-0.1 - lead was below the laboratory Limit Of Reporting (LOR), with a zinc concentration
                         of 0.4mg/L
                    •    Sample TP10-05 - arsenic, cadmium, chromium and nickel were below the LOR, with copper, lead
                         and zinc detected respectively at 0.2, 0.2 and 0.8mg/L

                    •    Sample TP13-0.1 – zinc concentration of 0.1mg/L
                    •    Sample TP14-1.0 – zinc concentration of 0.3mg/L

                    •    Sample TP21-0.1 – zinc concentration of 0.2mg/L.
                    The above results indicate that the zone of very frequent wastes over AEC 2 with some of the highest
                    heavy metal total concentrations has potential to leach and migrate, at levels locally exceeding drinking
                    water criteria for lead, and a range of other criteria for other tested metals. Note that a clear linkage to
                    human or ecological receptors has not been established to date. In addition, the zinc (and to some
                    degree other heavy metals) present in soil across the broader site also has potential to migrate within the
                    soil, and potentially interact with surface and groundwater as noted by the CSM.


        8.3.        GROUNDWATER

        8.3.1.      GROUNDWATER OBSERVATIONS
                    Groundwater bore locations are presented on Drawing 1 and the feature survey presented in Appendix A,
                    with these bores installed in late February 2024 and developed by the driller.
                    Dipping of the four installed bores for groundwater level measurement and detection of non-aqueous
                    phase liquids (NAPLs or ‘fuel products’) was first undertaken around two weeks after installation on
                    11/3/24 using a calibrated interface meter, with no samples collected but with viable bores MB1, MB2 and
                    MB4 purged via removal of 30 standard bailer volumes. A second purge with sampling was undertaken
                    on 14/3/24 with purge and sample records and related groundwater information presented in Appendix N
                    and the equipment calibration certificates presented in Appendix O. The water samples were mildly turbid
                    for MB2 and MB4, and very turbid for MB1. No hydrocarbon sheens or odours were detected.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                   70                           Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900