REFERENCE DOCUMENTS - RAL25/0004 (As Published)

        5.          CONCEPTUAL SITE MODEL
                    A CSM is the interpretation and assimilation of all site related information into assumptions and
                    hypotheses regarding contamination sources, subsurface contaminant distribution, and dominant
                    transport/fate processes (US EPA 1995). The CSM below was developed on the findings of desktop
                    assessment to date, walkover and resultant AEC and PCOC. The CSM is presented in Table 9 below and
                    graphically in Figure 15 over page.
                    Table 9 Conceptual Site Model
                               Potential
                      AEC                           Pathway                    Receptor                      PCOC
                               Source(s)
                      1        Northern night       Ingestion, dermal          Current and future site       Physical wastes,
                               soil and bottles     contact, inadvertent       users and ecological          primarily bottles and
                               disposal area        inhalation of dust or      receptors.                    nightsoil, and chemical
                                                    landfill gas or vapour.                                  contamination
                                                    Stormwater runoff and      Six Mile Creek Left           primarily consisting of
                                                    discharge                  Branch and prior              heavy metals,
                                                                               drainage channels             TRH/BTEXN,
                                                                                                             OCP/OPP and
                                                    Leaching/vertical          Groundwater                   asbestos. Also
                                                    migration of                                             potential for
                                                    contaminants                                             pathogens, PAH, PCB,
                                                                                                             SVOC, PFAS,
                                                                                                             nutrients and landfill
                                                                                                             gas or vapours.
                      2        Southern             Ingestion, dermal          Current and future site       Physical wastes with a
                               rubbish              contact, inadvertent       users and ecological          possible range of
                               disposal area        inhalation of dust or      receptors.                    regulated wastes and
                                                    landfill gas or vapour.                                  chemical
                                                    Stormwater runoff and      Six Mile Creek Left           contamination
                                                    discharge                  Branch and prior              primarily consisting of
                                                                               drainage channels             heavy metals,
                                                                                                             TRH/BTEXN,
                                                    Leaching/vertical          Groundwater                   OCP/OPP and
                                                    migration of                                             asbestos. Also
                                                    contaminants                                             potential for
                                                                                                             pathogens, PAH, PCB,
                                                                                                             SVOC, PFAS,
                                                                                                             nutrients and landfill
                                                                                                             gas or vapours.
                      3        All AECs –           Intermittent surface       Downgradient                  Per above selected
                               groundwater          flows, rainwater           groundwater and               PCOCs excluding inert
                               and                  infiltration and related   surface flows, and            larger physical wastes
                               stormwater           transport via perched or   connected consumers           and, for groundwater,
                               surface flows        permanent groundwater      and ecology                   asbestos.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                   Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                       30                          Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900