REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    I1. QUALITY ASSURANCE AND QUALITY CONTROL
                    Environmental Advisors Pty Ltd implemented a quality control program for the assessment, with quality
                    assurance elements including:
                    •     Using qualified and experienced personnel to conduct the field investigation.
                    •     Compliance with any Site-specific project plans.
                    •     Using a NATA registered laboratory (primary and secondary) for sample analysis.

                    •     Despatching samples using appropriate chain of custody procedures.
                    •     Referring to procedures for soil 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 sampling and investigation of potentially contaminated soil.
                               AS4482.1 – 2005.
                          ○    Queensland Government 2018. Queensland Auditor Handbook for Contaminated Land Module 6:
                               Content requirements for contaminated land investigation documents, certifications and audit
                               reports (ESR/2018/4224) (Module 6).
                    I1.1 DATA QUALITY OBJECTIVES
                    Data quality objectives are presented in Table QA1.
                    Table QA1 DATA QUALITY OBJECTIVES

                        Item                      Detail
                        Documentation             Completion of field sheets and laboratory chain of custody documentation.
                                                  Reporting using standard measurements and nomenclatures.
                        Completeness              Selection and analysis of contaminants of environmental concern based
                                                  upon Site history information and field observations, subject to assessment
                                                  limitations. Along with the representativeness of collected data, as a limited
                                                  Site assessment a more detailed assessment may be required to address
                                                  the data gap of potential or actual contamination.
                        Comparability             Consistency of field sampling techniques and use of a NATA certified
                                                  laboratory utilising traceable USEPA and APHA methods, or similar.
                        Representativeness        Samples collected using a systematic approach with targeted sampling
                                                  within Areas of Environmental Concern (AEC) to provide the accuracy
                                                  required for the agreed scope.
                        Precision                 Calculation of Relative Percentage Difference (RPD) for field duplicate sets
                                                  to assess reproducibility of data against criteria and allow comment on
                                                  validity.
                        Accuracy                  Data accuracy is achieved through minimising bias effects on samples
                                                  collected and analysed, such as from cross contamination, incorrect
                                                  preservation or laboratory techniques. Measures of accuracy include
                                                  following correct sampling and transport procedures, absence of detectable
                                                  contamination in field blanks, and use of laboratory quality control samples
                                                  such as surrogates.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                   Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                      93                           Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900