REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    concentrations. Explosivity monitoring was less than the detection limit and was used as a surrogate for
                    PID readings.
                    Whilst field screening is preferred when no significant rain has occurred the week prior to or during
                    sampling to ensure soil pore spaces are not saturated, this was not possible given monsoonal conditions
                    experienced during the works. This means there was potential for any LFG to be suppressed and not
                    detected during the DSI 1 monitoring that may have otherwise been recorded during dry conditions.
                    DSI 2 works included installation and monitoring of 7 LFG bores as well as within the 4 groundwater
                    bores, with results presented in Table 20 below with no detected SAC exceedances.
                    Table 20: Landfill gas bore monitoring
                                                  Atmospheric
                                                                Pressure       CH4    CO2        O2           CO            H2S
                      Bore         Time           pressure
                                                                differential   %      %          %            ppm           ppm
                                                  mbar
                      MB1          0811           1008          NA             0      1.8        17.2         0             0
                      MB2          0731           1008          NA             0      0.9        19.0         0             0
                      MB3          0824           1008          NA             0      2.0        15.7         0             0
                      MB4          0849           1008          NA             0      3.2        11.3         0             0
                      LFG1         0719           1008          <1 Pa          0      17.6       3.5          0             0
                      LFG2         0836           1008          <1 Pa          0      6.1        15.7         0             0
                      LFG3         0903           1008          <1 Pa          0      5.5        15.2         0             0
                      LFG4         0928           1009          <1 Pa          0      5.5        16.0         0             0
                      LFG5         0742           1008          <1 Pa          0      6.9        14.9         0             0
                      LFG6         0755           1008          <1 Pa          0      5.4        13.7         0             0
                      LFG7         0916           1009          <1 Pa          0      8.8        11.0         0             0
                    NA = not applicable due to absence of a biogas valve and quick fit nipple

                      X      Denotes result at or above initial screening SAC




        8.5.        SCREENING TRIAL
                    A trial soil screening exercise was performed on 23/4/24 using a 25mm trommel screen supplied and
                    operated by Soil Cyclers Pty Ltd (refer Photos 21 and 22 below). The purpose of this trial was to inform
                    remediation options for the northern AEC 1 that will be detailed separately as part of remediation planning
                    documents.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                              Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                    73                        Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900