REFERENCE DOCUMENTS - RAL25/0004 (As Published)

        7.          SITE ASSESSMENT CRITERIA

        7.1.        SOIL CRITERIA
                    The Site Assessment Criteria (SAC) are sourced from the NEPM and include:

                    •    NEPM Health Based Investigation and Screening Levels (HIL/HSL) for:
                         -    Residential A site use (HIL A) (with garden/accessible soil) – to inform the contamination status
                              of the site and used as a trigger value to determine if the site is considered to be
                              “uncontaminated” and would be suitable (subject to legislative policy) to be removed from the
                              EMR or if it otherwise requires further assessment to determine suitability, and
                         -    Public Open Space Site use (HIL C) – to inform if the Site is suitable for public open space (on-
                              going visitation) and to assess any exceedances above HIL A.

                    •    Soil health screening levels (HSL) for vapour intrusion, Schedule B1 Table 1A (3):
                         -    Exposure setting ‘HSL A and HSL B’,
                         -    Fine grained soils, and
                         -    Depth range 0m to <1m (most conservative). Less conservative criteria may be applicable for
                              greater depths.

                    •    Soil Management Limits (SML) for TPH fractions F1-F4 in soil, Schedule B1 Table 1B (7):
                         -    Exposure setting ‘Residential, parkland and public open space’, and
                         -    Fine grained soils.
                         -    Petroleum hydrocarbon ‘management limits’ are used to consider the potential effects of light
                              non-aqueous phase liquid related hazards:
                         ○    formation of observable Light Non-Aqueous Phase Liquids (LNAPL),
                         ○    fire and explosive hazards, and
                         ○    effects on buried infrastructure e.g. penetration of, or damage to, in-ground services by
                              hydrocarbons.
                    •    NEPM Environmental Investigation and Screening Levels (EIL/ESL) for:
                         -    Urban Residential/public open space setting use – used as trigger values to determine if the site
                              would be suitable to be removed from the EMR or otherwise requires further assessment to
                              determine suitability, and
                         -    The following physiochemical parameters have been used in calculations, based on background
                              soil sample TP4-1.0, or otherwise with estimations as noted:
                         ○    Exposure setting ‘Urban Residential and open public spaces’,
                         ○    Queensland site with low traffic volume,
                         ○    Aged contamination (>2 years old),
                         ○    Clay content 33% (estimated),
                         ○    Cation exchange capacity 1.8 meq/100g (measured),



        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                    53                          Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900