Attachment 5 - Geotechnical Report · MCU18/0015

J000635-002-R-Rev1                                                                                                                                 November 2018




Table of Contents
1.0        INTRODUCTION .................................................................................................................................... 1
2.0        PROPOSED DEVELOPMENT ............................................................................................................... 2
3.0        SITE DESCRIPTION .............................................................................................................................. 2
4.0        METHOD OF INVESTIGATION ............................................................................................................. 3
4.1        Fieldwork – Boreholes ............................................................................................................................ 3
4.2        Fieldwork - MASW Seismic Testing ....................................................................................................... 3
5.0        INVESTIGATION FINDINGS .................................................................................................................. 4
5.1        Geological Mapping ................................................................................................................................ 4
5.2        Ground Conditions .................................................................................................................................. 5
6.0        GEOTECHNICAL DISCUSSION & RECOMMENDATIONS .................................................................. 5
6.1        Earthworks .............................................................................................................................................. 5
6.1.1          Site preparation & trafficability ............................................................................................................ 5
6.1.2          Excavations ........................................................................................................................................ 6
6.1.3          Filling................................................................................................................................................... 6
6.1.4          Batter slopes ....................................................................................................................................... 6
6.1.5          Excavation support ............................................................................................................................. 6
6.2        Retaining Wall Design and Parameters.................................................................................................. 7
6.3        Foundation Design and Parameters ....................................................................................................... 7
6.3.1          High-level footings .............................................................................................................................. 7
6.3.2          Piles .................................................................................................................................................... 8
6.4        Drainage & Erosion Control .................................................................................................................... 9
7.0        SLOPE STABILITY ASSESSMENT & RECOMMENDATIONS ............................................................. 9
7.1        Qualitative Slope Stability Assessment ................................................................................................ 10
7.2        Slope Stability Modelling....................................................................................................................... 10
8.0        LIMITATIONS ....................................................................................................................................... 11


Tables
Table 1: Summary of Geotechnical Items from Noosa Council Information Request, and associated
responses. ......................................................................................................................................................... 1
Table 2: Seismic Data Acquisition Parameters. ................................................................................................ 4
Table 3: Retaining Structure Design Parameters. ............................................................................................. 7
Table 4: Pile Design Parameters. ...................................................................................................................... 8
Table 5: Stability Risk Levels. .......................................................................................................................... 10
Table 6: Qualitative Risk Assessment for Property (Based on AGS 2007)..................................................... 10

Figures
Figure 1 – Site Plan
Figure 2 – Seismic (MASW) Testing
Figure 3 – Slope Stability Modelling




                                                                                    ii