REFERENCE DOCUMENTS - RAL25/0004 (As Published)

                    G NEPM GIL’s for Fresh Waters as presented in Appendix N. Note that HSL’s for Vapour Intrusion have

                    not been used for TRH C6-C10 minus BTEX (F1) in the absence of other guidance. HSL’s to assess
                    vapour risk are generally higher than criteria relating to environmental or other human health criteria, with
                    vapour intrusion also assessed via the soil HSL criteria.
                    H Colour – not noticeable after 100 times dilution.

                    I NEPM Groundwater Health Screening Levels for vapour intrusion 2m to <4m, sand (conservative) that

                    may be adjusted subject to site specific geology and groundwater conditions.
                    J PFAS NEMP January 2018, 99% species protection ecological protection criteria to account for potential

                    bioaccumulation risks until these are discounted through site specific assessment for application of 95%
                    species protection for slightly to moderately disturbed conservation value systems.
                    K SW EPP aquatic ecosystem WQO’s for aquatic ecosystem – moderately disturbed. For toxicants, the

                    SW EPP recommended ANZECC 2000 trigger values for slightly–moderately disturbed systems have
                    been adopted.
                    M The values have been calculated using a hardness of 30 mg/L CaCO3. These should be adjusted to the

                    site-specific hardness.
                    N GW EPP values not specified - where ground waters interact with surface waters, groundwater quality

                    should not compromise identified EVs and WQOs for those waters. For toxicants, the GW EPP
                    recommended ANZECC 2000 trigger values for freshwater 99% protection have been adopted.
                    # Various sub-criteria. Refer to specific guidance should these contaminants be detected within
                    groundwater.


        7.3.        LANDFILL GAS
                    Land fill gas assessment criteria are presented in Table 17 below. The selected (lowest) SAC is
                    presented in bold.
                    Table 17: Landfill gas assessment criteria
                                                        Units              ERA 60   NSW EPA 2020                NSW EPA 2016
                      Methane (at 5cm above             ppm (v/v)          500      500                         500
                      ground surface)
                      Methane (sub-surface)             % (v/v)            -        <1A                         1
                      Carbon Dioxide (sub-surface)      % (v/v)            -        < background + 1.5A         < background + 1.5
                      Explosivity (structures)          LEL % (v/v)        1.25     1                           -
                      Explosivity (soil/geology)        LEL % (v/v)        5        -                           -
                      Explosivity (services such as     LEL % (v/v)        1.25     -                           -
                      pipes, drains and trenches)
                    Notes
                    A – for closure purposes the monitoring period is 24 months


                    Criteria presented in Table 17 is based on the following information sources:




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                    61                          Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900