REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    I1.4 FIELD PROCEDURES
                    SAMPLING
                    Samples were collected directly from the sides of each test pit. Nitrile gloves were changed for each
                    sample collected. Groundwater samples were collected using dedicated disposable bailers.
                    Samples were taken by hand and placed directly into laboratory supplied containers appropriate for the
                    analysis. No composite sampling was undertaken.
                    A fresh set of nitrile gloves were used at each sampling point, with the sampling trowel cleaned between
                    sampling locations, where used.
                    TRAVEL/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 trip blanks 051332, 020930, 011745 and 011747 were used as part of the current assessment and
                    analysed for TRH(C6-C9) and BTEXN with 020930 further analysed for PFAS, which were not detected.
                    Groundwater trip blank 220817 was analysed for TRH(C6-C9) and BTEXN which were not detected.
                    RINSATE
                    A rinsate sample is a solution that is as free as possible of analytes of interest, used to rinse
                    decontaminated reusable field equipment. Exposed rinsate is collected after contact with the
                    decontaminated sampling equipment and analysed to monitor potential for false positives from residual
                    contamination. Due to limited use of reusable sampling equipment, a rinsate sample was not collected.
                    DOCUMENTATION
                    Field QC included sample transportation under Chain of Custody procedures. Completed Chain of
                    Custody documentation and Sample Receipt Advice forms, certifying the condition of the samples upon
                    arrival at the contract laboratory, are attached with the ALS and Envirolab laboratory reports.
                    STORAGE AND TRANSPORT
                    Samples were collected into laboratory supplied containers appropriate for the matrix and the proposed
                    analysis and stored in ice-cooled and insulated containers. Sample integrity was maintained by using
                    sealed glass jars (soil samples) plastic bags (asbestos testing only) or dedicated glass or plastic water
                    sample containers.
                    FIELD DUPLICATES
                    A field duplicate is a single sample that is split into two sample containers with both separately analysed
                    by the primary or secondary 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.



        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                    Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                    95                              Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900