REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    •      DSI soil sampling – involving an additional 65 test pit or transect locations that met the intent and
                           sample location allowances of the SAQP, as follows:
                           -    35 grid locations across the entire 3.537ha site to build on the 11 PSI locations and comprise the
                                minimum 46 systematic sampling locations required by NEPM and NSW EPA Contaminated
                                Land Guidelines, Sampling design part 1 – application, August 2022 (NSW EPA 2022) for a site
                                of this size (being 45 samples for a 3.5ha site and 50 samples for a 4ha site)
                           -    17 grid infill locations at AEC 2 to double the grid sampling density for asbestos assessment and
                                to assist with delineating wastes within this area, to meet the requirements of NEPM Schedule B2
                                and Guidelines for the Assessment, Remediation and Management of Asbestos Contaminated
                                Sites in Western Australia, 2011 (WA 2021). This was based on PSI observations and Tables 4
                                and 5 in WA 2021, with asbestos likely (some isolated asbestos found and landfill present) the
                                corresponding sampling density required (for surface and at depth) is double that recommended
                                by AS 4482.15
                           -    the deferred 6 sampling locations to the south of the site as discussed in SAQP Section 9.2.1
                                (other adjustments for initial DSI sampling) were not required to be completed for the purposes of
                                asbestos assessment, due to no relevant wastes being identified over this area
                           -    13 targeted locations over AEC 1 where asbestos has not been identified to date, to assist with
                                delineating night soil deposits and assessing risk associated with historical structures at the
                                north-east site corner and a reported toilet can burial area
                           -    4 of the above test pits (being TP7, TP27, TP38 and TP76) were expanded into various 90
                                degree offset transects or similar arrangements to assist with waste delineation
                           -    soil sampling was not undertaken during the installation of the groundwater or LFG monitoring
                                bores, however, these locations were logged and provide an additional 11 locations of noted soil
                                conditions, albeit via drilling works that provide less information regarding potential buried wastes
                           -    location TP70 was required to be installed just off-site to the west, due to the presence of
                                structures and buried domestic water pipes
                           -    where wastes were encountered, field observations indicate that all sampling locations continued
                                into underlying natural soils.
                    Soil and other sampling locations are shown on Drawing 1 (Appendix A).

        6.2.2.      SOIL SAMPLING PROCEDURE
                    In accordance with NEPM Schedule 2 Section 11.1 and SAQP Section 9.2.2 the SQP was present during
                    all soil sampling works and has demonstrated competence in contaminated land investigations including
                    asbestos assessment. Sample collection methodology comprised:
                    •      Asbestos 7mm field sieving of a 10L sample was undertaken at all locations of suspected potential
                           asbestos impact (being any locations where wastes were observed) to progress identification of the
                           presence and form of any asbestos, being potential Asbestos Fines (AF), Fibrous Asbestos (FA) or
                           Asbestos Containing Materials (ACM).



                    5
                        The guidance downloaded from https://www.health.wa.gov.au/~/media/Files/Corporate/general-documents/Asbestos/PDF/14020-
                         Asbestos-Contaminated-Sites-WA-Guidelines-Chapter-5.pdf refers to AS 4485.1 (security for healthcare facilities) in Table 5 and
                         is assumed to be a referencing error to AS 4482.1 Guide to the Investigation and Sampling of Potentially Contaminated Soil –
                         Non-Volatile and Semi-Volatile Compounds. Note that AS 4482.1 is no longer supported by AS, with similar minimum sampling
                         densities provided by the relevant NSW EPA 2022 guidance (in the absence of comparable Qld guidance).



        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                                 Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                              37                                 Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900