Appendix D - Geotechnical Report

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Client:         Tectonic Geotechnical Pty Ltd                              Job No:                 #002552                                                         Sample ID:        00009128
Address:        924 David Low Way Marcoola                                 Lot No:                 0.10 - 0.40m                                                    Client Sample ID: TP5
                Queensland 4564
                                                                           Material Source:        Black Mountain Range Road, Black Mountain                       Sample Method: Sampled by Client
Site:           Black Mountain Range Road, Black Mountain                  Material Type:          Insitu Material                                                 Sampled Date:          4/03/2026
                                                                                                   CLAY, with sand, brown, medium plasticity, fine to coarse
                                                                           Description:            grained sand
Order No.:      26073                                                                                                                                              Tested Date:           16/03/2026 to 24/03/2026
Order name:     Black Mountain Range Road, Black Mountain                  Lithology:              -

                                                                                           SHRINK / SWELL
SHRINK TEST AS1289 7.1.1 Cl 5.2                                                                                          SWELL TEST AS1289 7.1.1 Cl 5.1

Length of Specimen (mm)                                                            88.43                                 Vertical Surcharge Pressure During Swelling (kPa)                                       25

Mass of Specimen (g)                                                               278.7                                 Height of Specimen (mm)                                                               20.11

Mass of Oven dried Specimen (g)                                                    208.6                                 Initial Moisture Content (w1) % AS1289 2.1.1                                           28.3

Initial Moisture Content (w3) % AS1289 2.1.1                                        33.6                                 Final Moisture Content (w2) % AS1289 2.1.1                                             35.3

Extent of Soil Cracking                                                            Minor                                 Swell %                                                                                0.5

Extent of Soil Crumbling                                                             Nil

Inert Inclusions (%)                                                                 6.6
                                                                                                                                            SHRINK SWELL INDEX (Iss) %                                          2.5
Shrinkage %                                                                          4.3

                               Extruded Sample                                                                                                                     Dry Shrinkage




                                Inert Shrinkage                                                                                                                       Inert Swell




                                                                      Swell Test PP Reading - Before: 180 kPa & After: 230 kPa
Remarks:        Minor crack evident in shrinkage sample prior to drying
                Organics present in shrinkage sample



Approved Signatory:                                                                                 Adrian Collier, Principal Consultant                                                              Date: 27/03/2026




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Accreditation No.:               20630                                                                                                                                      Cert No.: 128-00009128
Accredited for compliance with ISO/IEC 17025                                                                                                                               Form No.: GWB-FMR-128 v 1.0 28.07.2025