Geotechnical Report Dec 2013 Revision 1

                              55 LAKE MACDONALD DRIVE, COOROY


        INVESTIGATION FINDINGS
5.1      Regional Geology
The 1:100,000 Gympie Special Geological Map (Sheet 9445 and Part 9545) indicates that the site is underlain
by the Early to Middle Triassic-aged Kin Kin Beds formation comprising arenite, argillite, phyllite.

5.2       Subsurface Conditions
The subsurface conditions encountered in the test pits located in the proposed residential areas (TP1 to TP6)
generally comprised about 0.2m of loose to medium dense silty sand topsoil over about 0.1m to 0.2m of loose
to medium silty sand (similar material as the topsoil but no vegetation), then loose to medium dense clayey
sand. High plasticity, sandy/silty clay was encountered below the clayey sand in all test pits except TP3. Test
pit TP1 did not encountered the clayey sand layer (silty sand directly overlies clay).




                                                                           Topsoil
                                                                           Silty Sand

                                                                           Clayey Sand

                                                                           Sandy Clay




Text Figure 8: Test pit TP2

The test pits located in the proposed pavement areas (TP7, TP9, TP12 and TP13) encountered similar profiles
as TP1 to TP6. Test pit TP8, which was located at the edge of the drainage gully, encountered 0.3m of very
loose, grey/dark grey, moist silty sand with a high organic content over wet, very loose sand, then stiff sandy
clay at 0.5m depth. Some large logs were encountered in test pit TP12, and some smaller logs were found in
TP13.




2 December 2013
Report N0. 13008-001-Rev1                             7