Appendix H - Dewatering Management Plan · MCU25/0053

                                                                                           ADG Consulting Pty Ltd


1        Introduction
         ADG Consulting Pty Ltd (ADG) was engaged by Seymour Group to prepare a Dewatering Management
         Plan (DMP) for the proposed residential apartment development within property described as Lot 0 on
         BUP10936, 7 Noosa Parade, Noosa Heads, Queensland.
1.1      Proposed development
         It is understood the proposed development will comprise a two‐storey building over a single‐level in‐
         ground basement, extending across the 1,120 m2 site.

         Based on information provided by Seymour Group, existing ground levels across the proposed basement
         footprint are approximately RL 2.1 m Australian Height Datum (AHD). Excavations to facilitate the
         basement construction are proposed to extend to an approximate depth of 2.8 m below existing ground
         level (bgl), corresponding to an approximate elevation of RL ‐1.1 mAHD (i.e. finished basement floor level
         of RL ‐0.7 mAHD; allowing for 400 mm raft slab and blinding layer). Localised deeper excavations may be
         required to facilitate other structural elements (i.e. lift overrun pit, pile caps and footings), where
         required.

         During a geotechnical and acid sulfate soil investigation on the site in January 2025, no groundwater was
         recorded in the drilling of boreholes to the depth of 4.5 mgbl (PTG Consulting, 2025). PTG noted that
         groundwater levels are expected to fluctuate in response to variations in rainfall and are likely to rise
         close to the ground surface during periods of heavy or prolonged rainfall. No further recent data has been
         supplied for review in preparing this DMP, however based on ADG’s experience on nearby sites in the
         locality in recent years, it is anticipated that groundwater should be expected at or around 0.5 m AHD +/‐
         0.5 m, depending on tidal and seasonal rainfall conditions. Dewatering will therefore be necessary to
         allow the basement and other structural elements to be constructed in dry conditions.
1.2      Relevant guidelines
         The DMP was prepared with reference to the following documents:

              Australian and New Zealand Guidelines for Fresh and Marine Water Quality 2018. Australian and
               New Zealand Governments and Australian state and territory governments, Canberra ACT, Australia
               (ANZG, 2018), which supersedes Australian and New Zealand Guidelines for Fresh and Marine Water
               Quality, Australian and New Zealand Environment and Conservation Council and Agriculture and
               Resource Management Council of Australia and New Zealand (ANZECC/ARMCANZ). 2000.

              Environmental Protection (Water & Wetland Biodiversity) Policy 2019. Queensland Government.
               2019.

              Guidelines for Managing Risks in Recreational Water. Australian Government, National Health and
               Medical Research Council (NHMRC). 2008.

              Monitoring and Sampling Manual 2018, Version 2 June 2018. Department of Environment and
               Science (DES). 2018.

              Noosa River environmental values and water quality objectives. Department of Environment and
               Science (DES). 2022.

              National Environment Protection (Assessment of Site Contamination) Measure 1999, (as amended
               May 2013). National Environment Protection Council (NEPC). 2013.

              Queensland Water Quality Guidelines 2009, Version 3. The Department of Environment and
               Heritage Protection (DEHP). 2013.




    ADG1777.25 Dewatering Management Plan_Rev0_01.05.25                                                      Page 1