ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24

                                                                                                ADG Consulting Pty Ltd


2        Site characteristics
2.1      Property description
         The site is described as Lot 145 on N21859, and is situated at 38 Mossman Court, Noosa Heads,
         Queensland. The site is understood to be currently occupied by a multistorey dwelling (Nearmap Imagery,
         10 September 2021) which is planned to be demolished. The site is irregular in shape and has an area of
         607 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             Mossman Court, then residential development, then Noosa River.

                     East             Residential development.

                    South             Noosa River, then reserve area, then residential development.

                    West              Residential development, 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 from the north to the south, southeast. Surface elevations range from 2.20 m to between
         1.62 and 1.25 m AHD. Refer to Appendix C (Design Plans).
2.4      Geology & soils
         The surface geology at the site is mapped as being Anthropocene aged gravel, sand and silt; man‐made
         deposits generally associated with land‐fill or mining (tailings, dumps and rehabilitated areas). The
         dominant rock type is identified as volcanic and metamorphic as reference through the detailed surface
         geology (accessed via Queensland Globe online, 6 October 2021).

         The Acid Sulfate Soils (ASS) mapping layer 1:100,000 Redcliffe to Teewah 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 (accessed via Queensland Globe online, 6 October 2021).
2.5      Hydrogeology
         A search of groundwater bores licensed by DRDMW was conducted by ADG on 6 October 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 south. 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.




    ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24                                                           Page 3