Reference Document - MCU25 0101 (As Published)

 Project No. PG-13872                                                                                           Page | 6
 August 2025
 Ref: PG-13872, 2025-08-14, GR VER 1
 Stephen & Jane Struss – Geotechnical Investigation - Proposed Residence, 28 Kingfisher Drive, Peregian Beach




          All topsoil (i.e. soil containing organic matter) and soils containing deleterious
           matter should be stripped from the construction area at the commencement
           of the earthworks operation. Dirty sands (i.e. >5% fine content) could be difficult
           to manage and consideration could be given to the disposal of this material.
          The stripped surface should be proof rolled under Pacific Geotech’s supervision
           using a vibrating roller or a large vibrating plate compactor (say 300kg), to
           identify areas of weak surficial soils and to compact the upper-level material.
          The “clean” sands on site will be suitable for re-use as structural fill, provided
           material is free of organic matter and deleterious material. The silty sand may
           prove difficult to re-use and consideration should be given to preferential
           disposal of this material.
          Imported fill should be of fair to good quality with a minimum Soaked CBR value
           of 10%, a maximum Iss=1.0% and a maximum particle size of 75mm, or a clean
           sand.
          All filling should be undertaken in layer thicknesses of approximately 250mm (or
           as appropriate for the compaction equipment being used). Fill should be
           compacted to a minimum dry density ratio of 98% Standard in accordance
           with AS1289 5.1.1 for cohesive fill and 75% Density Index for non-cohesive fill (i.e.
           sand).
          Field density testing should be carried out to check the standard of
           compaction achieved and the placement moisture content. The frequency
           and extent of testing should be as per guidelines in AS.3798-2007.

8.0 BATTERS – SHORT TERM EXCAVATION PROFILE

It is understood that cut batters to 4m in height will be required as part of the basement
construction.

Considering the proposed maximum height of cut, the following recommendations
are made for the bulk excavation of the site.

Batters < 2.0m in height

          1V:1.5H batter with crest of batter >2m from buildings or structures.
Batters > 2.0m in height

          1V:1.5H batter with the crest of the batter at least 2.0m inside the site boundary.
          2.0m minimum distance from any building or structure.
If batters are to be left exposed for an extended period of time, a batter angle of
1V:2H is recommended and berm widths are to be strictly maintained. The above
batter slopes assume no seepage is present in the batters and the batters are above
the water table.