REFERENCE DOCUMENTS - RAL25/0004 (As Published)

        10.         CONCLUSIONS AND RECOMMENDATIONS
                    Noosa Council engaged Environmental Advisors Pty Ltd to undertake a Detailed Site Investigation (DSI)
                    for land described as Lot 105 SP118458, Cooroy, QLD 4563 (refer to Drawing 1 in Appendix A). The
                    investigation involved a desktop site history and then intrusive investigations of fill, soil, groundwater and
                    landfill gas to inform the assessment of feasibility to redevelop the site for affordable housing.


        10.1.       AREAS AND CHEMICALS OF ENVIRONMENTAL CONCERN
                    The following areas of environmental concern (AEC) and associated potential contamination sources
                    were identified:
                    •    AEC 1 – northern night soil and bottles disposal area – historical disposal in the 1950’s and 60’s of
                         nightsoil, bottles, and possibly other co-mingled wastes with potential to generate landfill gas or
                         cause additional impact, primarily to underlying natural soils or groundwater.

                    •    AEC 2 – southern rubbish disposal area – historical disposal in the 1950’s and 60’s of general
                         rubbish with potential to cause additional impact, primarily to underlying natural soils or groundwater.

                    •    AEC 3 – water – potential for migration of impacts from the adjacent cemetery and AEC 1 and 2 via
                         surface or groundwater, which if present may affect deeper soil or groundwater at the site, and off-site
                         areas including landfill wastes transported by surface flows during high intensity rainfall events.
                    The above risks were investigated in accordance with the agreed scope and limitations, and it was found
                    that:

                    •    The historical disposal of the suspected waste types within AEC 1 and 2 has been confirmed.
                    •    The southern landfill area waste deposits appear superficial in nature as delineated on Drawing 2 in
                         Appendix A. Chemical exceedances are largely correlated with observed wastes. Relevant waste and
                         soil materials will need to be excavated for off-site disposal to landfill to progress EMR removal.

                    •    The northern night soil disposal area has fewer data points of concern but are deeper to around
                         1mbgl to account for the expected trenching of the night soil, with the likely remediation extent also
                         delineated on Drawing 2. Other than the expected can disposal area and locations TP27 and TP75,
                         other observed physical wastes were minor (but still of concern) with elevated heavy metals also
                         occurring at various locations.

                    •    The central gully portion of the site between the two waste deposition areas and the southern end of
                         the site do not appear to have any significant and widespread impact based on works to date and are
                         not expected to require remediation.

                    •    Underlying natural soils seem mostly free of any widespread unacceptable impact, and appear to be
                         retarding the migration of the overlying contamination impact, where present. However, some heavy
                         metal migration to natural soil and to groundwater has occurred.

                    •    The preliminary investigation that preceded this DSI had data gaps associated with landfill gas and
                         potential chemical impact from PFAS, PAH, PCB and SVOC that have now been quantitatively
                         assessed and are likely to not be of concern, noting that an additional round of gas monitoring is
                         pending during warmer and drier site conditions.




        125 Lot 105 SP118458 Cooroy DSI 12062024 Rev0                                                 Lot 105 SP118458, Cooroy, QLD, 4563
        12/06/2024                                                   78                            Detailed Site Contamination Investigation
Document Set ID: 23717062
Version: 0, Version Date: 01/01/1900