Reference Document - RAL25/0020 & OPW25/0194 (As Published)

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Report on Geotechnical Investigation
Proposed Subdivision
12-14 Gympie Street, Tewantin


1. Introduction

This report presents the results of a geotechnical investigation undertaken by Douglas Partners
Pty Ltd (Douglas) for the proposed subdivision at 12-14 Gympie Street, Tewantin (the ‘site’).

The investigation was undertaken at the request of MAJP Consulting on behalf of Novato Group
Pty Ltd ATF Tewantin Unit Trust following authorisation to proceed received on 3 September
2025.

The aim of the investigation was to assess the following:
•    subsurface conditions including groundwater;
•    earthworks, stripping and site preparation, unsuitable soils, excavatability and workability of
     potential cut materials, dispersion, suitability of site soils for reuse, compaction standards;
•    foundation soil reactivity in accordance with AS2870(2011);
•    indicative footing options, allowable bearing pressures and estimated settlements to the
     depths investigated;
•    geotechnical parameters for retaining wall design;
•    assessment of subgrade CBR values for pavement design;
•    presence and severity of acid sulfate soils (ASS); and
•    management and treatment of ASS.

The investigation comprised the drilling of six bores, followed by laboratory testing. Details of the
field work and laboratory testing are presented in this report, together with comments on the
items listed above.

This report must be read in conjunction with the notes entitled “About This Report” in Appendix A
along with any other explanatory notes and drawings, and should be kept in its entirety without
separation of individual pages or sections.


2. Site Description

The site for the proposed subdivision is located at 12-14 Gympie Street, Tewantin, and is described
as Lot 42 on RP867323. The site is broadly rectangular in shape, bounded by Gympie Street to the
south, surrounded by residential development (refer to Drawing 1, Appendix B).

At the time of the investigation, the site was occupied by a single storey dwelling and a detached
shed located in the southern portion of the site. The ground surface was generally covered with
well maintained grassed lawns with landscaped areas and scattered trees across the site. The
photograph in Figure 1 indicates typical site conditions at the time of investigation.




Proposed Subdivision                                                                237894.00.R.001.Rev0
12-14 Gympie Street, Tewantin                                                              October 2025