Reference document Geotech Investigation · MCU22/0087.01

                                             PROPOSED UNIT DEVELOPMENT
                                             37 BOTTLEBRUSH AVENUE, NOOSA HEADS

            Table 1 below summarises the subsurface profile in each borehole.
            Table 1: Summary of Subsurface Profiles
                                                                                 Very
                                                                                                 Medium Dense
               Borehole No.            Pavement                Fill           Loose/Loose                       Dense Sand
                                                                                                     Sand
                                                                                 Sand

                    BH1                0 – 0.06            0.06 – 0.4               N/E            0.4 – 3.1    3.1 – 6.0TD

                    BH2                0 – 0.02            0.02 – 0.8            0.8 – 1.1         1.1 – 3TD     4.1 – 4.5*

                    BH3                0 – 0.02            0.02 – 1.2            1.2 – 2.5         2.5 – 3TD     3.8 – 5.2*
            Notes: 1.           Depths noted in m BGL at time of investigation (21 April 2022)
                   2.           NE denotes not encountered
                   3.           TD denotes borehole terminated at target depth

                   4.           * inferred from DCP testing

            4.5         Groundwater
            No signs of groundwater seepage (‘springs’) were observed during our walk-over. Groundwater was not
            encountered in the boreholes at the time of investigation.

            Groundwater conditions are expected to be reflective of prevailing weather conditions and seepage may
            develop particularly following periods of prolonged or heavy rainfall.

            4.6         Surface Drainage
            Surface drainage would be expected to follow natural surface contours to the south-west towards
            Bottlebrush Avenue, thus draining into the roadside drainage system. It is noted that the site has a
            relatively large catchment; however, most runoff from upslope of the property is anticipated to be
            intercepted by the existing stormwater infrastructure associated with the neighboring structures and
            roadside drainage systems.

            Given the sandy nature of the site, rainfall would normally be anticipated to infiltrate the ground surface.
            However, as the proposed development will occupy a large part of the block, significant run-off from hard
            surfaces will occur. Nevertheless, where directed into swales rather than pipes, such run-off would be
            expected to infiltrate into the natural sands relatively rapidly.

            No significant surface run-off features were noted during our assessment (e.g. deep rilling or scour/wash out
            scars). This indicates that significant overland flow is generally absent during rainfall events.
            Recommendations to improve surface drainage as part of the development works are provided in
            Section 6.5.




             13 May 2022
             Report No. 22151-001-Rev0                                   6
Document Set ID: 22198682
Version: 1, Version Date: 05/12/2022