ADG Dewatering Management Plan · OPW21/0315

                                                                                        ADG Consulting Pty Ltd


2    Site characteristics
2.1 Property description
     The site is described as Lot 16 on N10576, and is situated at 33 Wyuna Drive, Noosaville, Queensland.
     From most recent available aerial mapping dated 5 July 2021, the site contains a multi storey residential
     dwelling planned for demolition and is generally rectangular in shape. The site has a combined area of
     614.25 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             Noosa River.

                 East             Single residential lot, then Noosa River.

                South             Wyuna Drive, then multiple residential lots.

                West              Multi residential lots, then Noosa River.


2.3 Topography
     The site and surrounding land is considered to be generally level, with the site gently sloping towards the
     Noosa River to the north with surface elevations ranging between approximately 2.4 m to 1.11 m AHD
     from the southern boundary toward the north-eastern corner of the site (Douglas Partners, Drawing No.
     95120.00, Drawing No: 1, September 2020).
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, 10 September 2021)

     The Acid Sulfate Soils (ASS) map 1:25,000 Redcliffe to Teewah – Map 2 categorises the site as ‘SDL’ or ‘Acid
     Sulfate on Disturbed Land’, indicating that the site is likely to contain acid sulfate soils (and potential
     exists that partial or full treatment may have been undertaken), however limited field investigation has
     been performed in this area (DNRM 2002).
2.5 Hydrogeology
     A search of groundwater bores licensed by DRDMW was conducted by ADG on 10 September 2021. The
     search identified no licensed bores within a 500 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. Groundwater beneath the site is likely to be hydraulically connected to
     the river, therefore saline groundwater conditions are anticipated, and additional saltwater intrusion is
     likely to occur during dewatering.




ADG1290.21 Dewatering Management Plan_Rev0_12.10.21                                                        Page 3