REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    •    Matrix spikes - samples were spiked by the laboratory with a known concentration of analytes and
                         then tested for percent recovery to monitor matrix effects on analyte recovery.

                    •    Surrogates – known quantities of similar compounds to the target analytes are added to samples to
                         monitor potential analyte loss at any stage of laboratory analysis.

                    •    Laboratory duplicates – a randomly selected sample is split and then analysed with the samples
                         forming the analytical run.

                    •    Method/laboratory blanks – use of reagent blanks to monitor potential contamination of equipment
                         and standards being used.

        6.6.5.      FIELD BLANK
                    A field blank sample is a solution or appropriate media that is as free as possible of analytes of interest.
                    The field blank is packaged similarly to the samples being collected, and accompanies the field samples
                    throughout sampling, transport and laboratory analysis to monitor potential for false positives from
                    introduced contamination.
                    Soil and water field blanks were sourced from the laboratory and used in accordance with the SAQP.

        6.6.6.      FIELD DUPLICATES AND TRIPLICATE
                    A field duplicate is a single sample that is split into two sample containers with both separately analysed
                    by the laboratory (with unrelated sample labelling), providing a measure of analytical precision. The
                    results of both samples are then assessed by comparing the Relative Percentage Difference (RPD) of
                    each analyte, noting that the RPD may also be influenced by sample heterogeneity and sampling
                    procedures.
                                                                                          𝑉1−𝑉2
                                                   Relative Percentage Difference (RPD) = 𝑉1+𝑉2 𝑥 100
                                                                                          (       )
                                                                                              2


                    The generally adopted RPD criteria is  30% RPD for field duplicates for inorganics and  50% RPD for
                    field duplicates for organics.
                    Field duplicates were collected and analysed at a target rate of 1 per 10 primary samples (with a triplicate
                    target of 1 per 20 samples) with actual rates presented in Sections 6.2.2 and 6.2.3.

        6.6.7.      FIELD RINSATES
                    The use of rinsate samples was not considered to be required due to low dependence upon re-usable
                    field sampling equipment (i.e. hand trowel).

        6.6.8.      DETAILED QA/QC AND OUTCOMES
                    The detailed scope and outcomes of the QA/QC program is presented as Appendix I. In summary, based
                    on the quality assurance measures and review undertaken, the quality of the analytical data produced is
                    considered of acceptable standard for interpretive use within this Report.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                    Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                    52                              Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900