REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    The rationale for groundwater sampling covered by the SAQP was to initially assess the deeper
                    permanent groundwater conditions at the site boundary both up and down gradient via installation of 3 to
                    5 boreholes to a depth of 30mbgl, with 4 bores installed as shown on Drawing 1 in Appendix A and the
                    construction logs presented in Appendix N.
                    •    MB1 – installed at eastern boundary within a small valley expected to be downgradient of AEC 1 and
                         AEC 2
                    •    MB2 - north-east corner of the site and nominally downgradient of AEC 1
                    •    MB3 – eastern boundary nominally downgradient of an area of known landfilling at AEC 2

                    •    MB4 - installed at the north-western boundary and nominally an upgradient bore that would be
                         expected to receive groundwater flows from the cemetery land.

        6.3.2.      MONITORING BORE CONSTRUCTION
                    The 4 groundwater monitoring bores were drilled and constructed to a target depth of 30mbgl with
                    reference to:

                    •    Minimum Construction Requirements for Water Bores in Australia, Edition 3 (2012).
                    The actual depths for some bores were reduced due to refusal on rock or wet soil conditions collapsing
                    the hole, with MB1 installed to 8mbgl in collapsing soils (water present), MB3 refused on basalt at
                    7.6mbgl (dry) and MB4 refused on white sandstone at 25mbgl (water present). MB2 was installed to the
                    target 30mbgl with water present.
                    Monitoring bores were constructed from factory slotted 50mm Class 18 UPVC and screened to at least a
                    metre below any encountered or expected waste materials so as to minimise introducing a preferential
                    pathway to the aquifer. Soil sampling was not undertaken at the time of bore installation.
                    The screening was surrounded by a 2mm washed sand gravel pack and sealed to the surface with a
                    bentonite seal (wetted during installation) or as otherwise required based on field observations to avoid
                    migration of overlying contamination. Bores were finished with a stick up and lockable monument covers.
                    Following installation, the bores were developed using compressed air to extract at least three well
                    volumes (MB3 was dry). Groundwater monitoring bore logs are presented in Appendix N.

        6.3.3.      GROUNDWATER SAMPLING PROCEDURE
                    To investigate groundwater at the site, the following scope was completed:
                    •    Development of the bores after completion of drilling (development water disposed of onsite)

                    •    Bores left to ‘rest’ for at least 7 days
                    •    Remobilise to site

                    •    Dipping of all bores for groundwater level measurement and detection of non-aqueous phase liquids
                         (NAPLs or ‘fuel products’)

                    •    Purging of groundwater and measurement of field parameters until stabilisation using a water quality
                         meter and flow cell

                    •    Use of properly calibrated dip and water quality meters with calibration certificates presented in
                         Appendix O




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                   40                           Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900