Reference document Geotech Investigation · MCU22/0087.01

                                         PROPOSED UNIT DEVELOPMENT
                                         37 BOTTLEBRUSH AVENUE, NOOSA HEADS

            If filling or permanent cuts exceed 1 m high/deep, then these must be retained. Permanent cut and fill batters
            up to 1 m high shall not exceed 1V:2.5H. Any permanent soil and fill batters will require erosion protection
            (e.g. revegetation or surface protection).
            It is likely that above temporary batter slopes may not be able to be achieved in places, due to spatial
            constraints, and so temporary shoring will be required (e.g. sheet piles) as per the recommendations in
            Section 6.4 below. Excavations in close proximity to existing structures, including on neighbouring
            properties, will need to be specifically designed to prevent undermining. It is recommended that footing
            exposures or confirmation of foundations via certified building plans be undertaken to assess the possibility
            of undermining. If undermining is a potential issue the existing structures may need to be underpinned or
            excavations may require temporary shoring.

            The advice of a suitably qualified and experienced structural RPEQ must be sought regarding any potential
            undermining as well as design and construction of any underpins/temporary shoring (if required).

            The above recommendations do not supersede any existing safety regulations or legislation applicable to
            excavations (e.g. limits on personnel entry into trenches).
            Due to the highly permeable nature of the sands at this site, stormwater is expected to rapidly infiltrate the
            ground, making un-sealed surface drainage ineffective for the control of flows. Any sealed areas should be
            graded to ensure free drainage of stormwater away from construction areas, and to a control point(s).

            6.2.3         Filling
            The existing sandy soils (fill and natural) where free of deleterious materials (e.g. vegetation, building debris
            etc.) may be reused as structural fill, subject to appropriate moisture adjustment. It should be noted that
            compaction of such relatively ‘clean’ sands as structural fill requires the addition of substantial volumes of
            water (‘flooding’) combined with the use of vibratory compaction equipment (typically a smooth drum roller or
            heavy vibrating plate).

            Should importation of fill be required, it is recommended that such fill should comply with the following:

                     Minimum CBR of 10%
                     Maximum plasticity index of 15%
                     Shrink-swell index ≤ 1%
                     Maximum particle size of 100 mm

            Any fill should be compacted at moisture contents within the range of ±2% of optimum moisture content for
            Standard Compaction. Fill material should be placed in 250 mm thick (loose thickness) layers and be
            compacted by repeated rolling using a minimum 4 tonne smooth drum roller (or equivalent, with vibration on
            if safe to do so) to achieve a dry density ratio of at least 95% of the maximum Dry Density Ratio (DDR),
            based upon the Standard Compaction method, or a Dry Density Index of at least 70%.

            Confirmatory compaction testing must be carried out at regular intervals. A minimum of two tests per vertical
            lift is recommended where structural fill heights are to exceed 300 mm. Further details for control and testing
            of fill are given in Australian Standard AS 3798-2007 Guidelines on Earthworks for Commercial and
            Residential Developments.

            Fill embankment edges must be over-filled by 0.5 m (horizontally) and then trimmed back to well compacted
            material.




             13 May 2022
             Report No. 22151-001-Rev0                             11
Document Set ID: 22198682
Version: 1, Version Date: 05/12/2022