Reference Documents

                                                          PROPOSED SUBDIVISION
                                                          41 TALLOWWOOD PLACE, BLACK MOUNTAIN

                    6.6         Geotechnical Certification of Operational Works ........................................................................................ 19

            7.0     WASTEWATER TREATMENT AND DISPOSAL .................................................................................................... 19

                    7.1         Existing Wastewater Infrastructure ............................................................................................................. 19

                    7.2         Wastewater Flow Design Allowance ........................................................................................................... 20

                    7.3         Terrain-Soil Assessment............................................................................................................................. 20

                    7.4         Recommendations ...................................................................................................................................... 20

                    7.4.1            System Type ......................................................................................................................................... 20

                    7.4.2            System Positioning................................................................................................................................ 21

                    7.4.3            System Construction ............................................................................................................................. 22

                    7.4.4            Maintenance and Inspection ................................................................................................................. 22

            8.0     LIMITATIONS .......................................................................................................................................................... 22


            TABLES
            Table 1: Stability Risk Levels ............................................................................................................................................ 10

            Table 2: Details of Qualitative Risk Assessment for Property (AGS 2007) ....................................................................... 11

            Table 3: Retaining wall design parameters ....................................................................................................................... 18

            Table 4: Setbacks for subsurface land application area for on-site sewage treatment plant ............................................. 21

            Table 5: Setback distances for on-site sewerage facilities (Protection of surface and groundwater) ................................ 21


            TEXT FIGURES
            Text Figure 1: Proposed subdivision layout, courtesy of Callaghan & Toth ........................................................................ 1

            Text Figure 2: 2022 aerial image of the site and immediate surrounds (courtesy Nearmap imagery)................................. 3

            Text Figure 3: Westerly view of the proposed development area........................................................................................ 3

            Text Figure 4: Oblique drone image of the site looking east ............................................................................................... 4

            Text Figure 5: Site plan showing ground surface contours (courtesy Noosa Council ‘Intramaps’) ...................................... 4

            Text Figure 6: Views of roadside fill embankments ............................................................................................................. 5

            Text Figure 7: Oblique drone image of the proposed development area and rock embankment, looking south-east ......... 6

            Text Figure 8: View of the rock fill embankment, looking west ............................................................................................ 6

            Text Figure 9: Extract from Gympie Surface Geology Map ................................................................................................. 7

            Text Figure 10: Subsurface conditions in test pits TP3 (LHS) and TP2 (RHS).................................................................... 8

            Text Figure 11: Extract from NSC landslide hazard overlay mapping ................................................................................. 9

            Text Figure 12: Slope/W Analysis Output for residential construction on proposed new lot .............................................. 12

            Text Figure 13: Construction exclusion zones and recommended building area, base map courtesy of NC .................... 13

            Text Figure 14: Footing depth required to prevent undermining or surcharge loading ...................................................... 17

            Text Figure 15: Existing wastewater treatment system (LHS) and inferred application area (RHS).................................. 19




             22 May 2023
             Report No. 23099-001-Rev0                                                             iv
Document Set ID: 22826802
Version: 1, Version Date: 23/02/2024