20220109 - Geotech · OPW23/0182

                                            PROPOSED RESIDENCE
                                            21 MAHER TERRACE, SUNSHINE BEACH

Table of Contents
1.0   INTRODUCTION ........................................................................................................................................................ 1

2.0   PROPOSED DEVELOPMENT ................................................................................................................................... 1

3.0   METHOD OF INVESTIGATION ................................................................................................................................. 2

4.0   RESULTS OF INVESTIGATION ................................................................................................................................ 2

      4.1         Site Description............................................................................................................................................. 2

      4.2         Topography................................................................................................................................................... 4

      4.3         Geology ........................................................................................................................................................ 5

      4.4         Subsurface Conditions.................................................................................................................................. 6

      4.5         Groundwater ................................................................................................................................................. 6

      4.6         Surface Drainage .......................................................................................................................................... 7

5.0   SLOPE STABILITY ASSESSMENT .......................................................................................................................... 7

      5.1         Existing Conditions ....................................................................................................................................... 7

      5.2         Stability Assessment..................................................................................................................................... 8

      5.2.1            Quantitative Assessment ........................................................................................................................ 9

6.0   GEOTECHNICAL RECOMMENDATIONS .............................................................................................................. 11

      6.1         Additional Investigation ............................................................................................................................... 11

      6.2         Development Limitations ............................................................................................................................ 11

      6.3         Earthworks – General ................................................................................................................................. 11

      6.3.1            Site Preparation and Trafficability ......................................................................................................... 11

      6.3.2            Excavations ........................................................................................................................................... 12

      6.3.3            Filling..................................................................................................................................................... 13

      6.4         Building Foundations .................................................................................................................................. 13

      6.4.1            Indicative Site Classification.................................................................................................................. 13

      6.4.2            Footing Design ...................................................................................................................................... 13

      6.5         Temporary and Permanent Retention......................................................................................................... 15

      6.6         Drainage ..................................................................................................................................................... 16

7.0   SUMMARY & CONCLUSIONS................................................................................................................................ 17

8.0   LIMITATIONS .......................................................................................................................................................... 17




16 July 2021
Report No. 21236-001-Rev0                                                              iii