REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                      Bore         Bore         Bore stick-up          Bore Screened                  Standing Water Level (mbtoc)
                                  Depth        (metres above              Interval
                                  (mbgl)        ground level)             (mBGL)                11/3/24                          14/3/24

                      MB4              25               0.71                5.5-25                   0.59                          0.06

        8.3.2.      GROUNDWATER ANALYTICAL RESULTS
                    All groundwater samples were analysed for dissolved heavy metals (ultra trace), TRH (with silica gel
                    clean-up), BTEXN, PAH, SVOC, PFAS (super trace short suite) and Total Dissolved Solids. Certificates
                    of laboratory analysis are presented in Appendix H.
                    Other than heavy metals and PFAS, no other tested analyte was detected above LOR. A summary of
                    analytical results for heavy metals and PFAS is presented in Table 19 below, including for sample D1 that
                    is the field duplicate sample for sample MB4-1.
                    Table 19 Groundwater Sample Analysis Summary
                      Compound              Units       Screening Criteria A      MB1-1      MB2-1          MB4-1          D1

                                                                                  14/3/24    14/3/24        14/3/24     14/3/24
                      Arsenic               µg/L                10                   <0.2      1.4           <0.2         <0.2
                      Cadmium               µg/L               0.06                  <0.05    <0.05          <0.05       <0.05
                      Total Chromium        µg/L                NLB                  <0.2      0.2            0.2         <0.2
                      Copper                µg/L                1.0                   4.3      1.1            1.7         0.5
                      Lead                  µg/L                1.0                   0.1      0.1           <0.1         <0.1
                      Mercury               µg/L               0.06               <0.0004    <0.0004        <0.0004    <0.0004
                      Nickel                µg/L                 8                    2.6      3.4            0.5         <0.5
                      Zinc                  µg/L                2.4                   13       15             4             2
                      PFOS                  µg/L               0.023              <0.002     <0.002         <0.002      <0.002
                      PFOA                  µg/L                19                <0.002     <0.002         <0.002      <0.002
                      PFBS                  µg/L           none available         <0.002     <0.002         <0.002        0.02

                    Notes:

                      X        Denotes result at or above initial screening SAC
                    A Most conservative criteria selected as presented in Table 16

                    B Chromium III criteria has been adopted (No Limit) as the potential for CrVI to be present is expected to

                    be low to negligible given the site setting and absence of CrVI in speciated soil samples


                    Copper and zinc exceeded ANZECC 2000 trigger values in all primary samples. In addition, copper and
                    zinc concentrations in samples MB1-1 and MB4-1 exceeded GIL and EPP Mary River surface water SAC,
                    but not drinking water criteria.


        8.4.        LANDFILL GAS
                    DSI 1 methane field screening results are noted on the borehole logs presented in Appendix G, and were
                    predominately 0ppm with transitory readings of up to 1ppm within a couple of test pits. Accompanying
                    carbon dioxide and oxygen concentrations were at expected naturally occurring atmospheric



        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                             Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                           72                                Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900