REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    Field and weather station measurements of rainfall, wind and atmospheric pressure were recorded and
                    used as part of the data interpretation and refinement of the CSM.

        6.5.2.      DSI 2 LFG WORKS AND SAMPLING PROCEDURE
                    With reference to Section 3.4.5 and Appendix A4 of NSW EPA 2020, to further investigate LFG at the site
                    the following scope was completed:
                    •    Installation of 7 LFG bores, fitted with quick connect nipples, to between 1.6 and 2.3mbgl over AEC 1
                         (refer to Drawing 1 Appendix A and logs presented at the end of Appendix G)
                    •    Bores left to ‘rest’ for at least 7 days

                    •    Remobilise to site to perform a round of monitoring on the 7 LFG bores and 4 groundwater bores
                         using a calibrated “GA5000” landfill gas monitor (refer to Appendix O for calibration certificate) for
                         methane (CH4), hydrogen sulfide (H2S4), carbon dioxide (CO2), carbon monoxide (CO), oxygen (O)
                         and barometric pressure and pressure differential at each LFG bore.


        6.6.        QUALITY ASSURANCE AND QUALITY CONTROL PLAN

        6.6.1.      QUALITY ASSURANCE PROCEDURES
                    The following quality control program was implemented for the assessment, with quality assurance
                    elements including:

                    •    Using qualified and experienced personnel to conduct the field investigation,

                    •    Compliance with the SAQP and other site-specific project plans,

                    •    Using a NATA registered laboratory for sample analysis,
                    •    Despatching samples using appropriate chain of custody procedures,
                    •    Referring to procedures for soil, water and LFG sampling, field testing and decontamination within:
                         ○    National Environment Protection Council (NEPC), 1999, as amended 2013. National Environment
                              Protection (Assessment of Site Contamination) Measure (NEPM)
                         ○    Standards Australia, Guide to the investigation and sampling of potentially contaminated soil.
                              AS4482.1 – 2005
                         ○    NSW EPA Contaminated Land Guidelines, Sampling design part 1 – application, August 2022
                              (NSW EPA 2022)
                         ○    NSW EPA Contaminated Land Guidelines - Assessment and management of hazardous ground
                              gases, 2020 (NSW EPA 2020)
                         ○    NSW EPA Environmental Guidelines, Solid waste landfills, Second edition, 2016 (NSW EPA
                              2016)
                         ○    DES (now DESI), 2018 as updated 18 May 2023, Queensland auditor handbook for
                              contaminated land: Module 6: Content requirements for contaminated land investigation
                              documents, certifications and audit reports. Brisbane: Department of Environment and Science,
                              Queensland Government (ESR/2018/4224 as updated 18/5/23) (Module 6)
                         ○    Heads of EPA Australia and New Zealand (2020) PFAS National Environmental Management
                              Plan Version 2.0 (NEMP)


        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                   50                           Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900