Appendix D - Acid Sulphate and Dewatering Managment Plan · OPW23/0179

                                                                                              ADG Consulting Pty Ltd


2    Site characteristics
2.1 Property description
     The site is described as Lot 1 on MCH3881, and is situated at 128 Gympie Terrace, Noosaville, Queensland.
     From recent available aerial mapping (Nearmap) the site has been cleared of aboveground infrastructure
     (circa June‐July 2022) and is generally rectangular in shape. The site has a total area of 556 m2. The site
     locality is shown in Figure 1, Appendix A.
2.2 Surrounding environment
     The surrounding environment and land use is described briefly in Table 1.

     Table 1 Surrounding land use and environment

              Direction                                               Environment

                North             Chaplin Park, then Noosa River.

                 East             Vacant land, then 2‐ storey residential lots, then canal network associated with Noosa
                                  River.
                South             Gympie Terrace, then multiple residential lots.

                West              Easement, then Mill Street.


2.3 Topography
     The site and surrounding land is considered to be generally level (PG, 2022), with the site surface
     elevations ranging between approximately 1.6 m to 2.0 m AHD from the southern boundary toward the
     north of the site.
2.4 Geology & soils
     The surface geology at the site is mapped as being Pleistocene aged sandy mud, muddy sand and minor
     gravel: estuarine channels and banks. The dominant rock type is identified as miscellaneous
     unconsolidated sediments as referenced through detailed surface geology (accessed via Queensland
     Globe online, 31 May 2023).

     The Acid Sulfate Soils (ASS) map 1:100,000 scale categorises the site as ‘SEA’ or ‘Disturbed Land with
     probability of ASS’, indicating that the site is likely to contain acid sulfate soils but the type and depth to
     ASS has not been defined (accessed via Queensland Globe online, 31 May 2023).
2.5 Hydrogeology
     A search of groundwater bores licensed by DRDMW was conducted by ADG on 31 May 2023. The search
     identified no licensed bores within a 200 m radius of the site. A map showing the bore search area is
     provided in Appendix B.

     Based on the local geology and topography, and the site’s proximity to the Noosa River, the inferred
     groundwater flow is to the north and/or east. Groundwater beneath the site is likely to be hydraulically
     connected to the river and/or canal network, therefore saline groundwater conditions are anticipated,
     and additional saltwater intrusion is likely to occur during dewatering.




ADG1535.22 Dewatering Management Plan_Rev0_31.05.23                                                               Page 3