Appendix D - Geotechnical Report

Table of Contents
Table of Contents ............................................................................................................................................................iii
1.       Introduction ............................................................................................................................................................ 1
2.       Proposed Development ....................................................................................................................................... 1
3.       Aims & Method of Investigation .......................................................................................................................3
         3.1 Fieldwork ...................................................................................................................................................................... 3
4.       Laboratory Testing ................................................................................................................................................3
5.       Results of Investigation ...................................................................................................................................... 4
         5.1 Site Description ......................................................................................................................................................... 4
              5.1.1     Proposed Lot 1 ......................................................................................................................................... 5
              5.1.2     Proposed Lot 2 ......................................................................................................................................... 6
              5.1.3     Proposed Lot 3 ......................................................................................................................................... 8
              5.1.4     Proposed Lot 4 ......................................................................................................................................... 9
              5.1.5     Proposed Lot 5 ....................................................................................................................................... 10
         5.2 Geology ...................................................................................................................................................................... 10
         5.3 Subsurface Conditions .......................................................................................................................................... 11
         5.4 Groundwater............................................................................................................................................................. 12
         5.5 Geotechnical Laboratory Test Results ............................................................................................................. 12
6.       Slope Stability Assessment ............................................................................................................................... 13
         6.1 Existing Conditions................................................................................................................................................. 13
         6.2 Slope Stability Assessment.................................................................................................................................. 14
              6.2.1     Qualitative Assessment ....................................................................................................................... 14
              6.2.2     Numerical Modelling ........................................................................................................................... 15
7.       Geotechnical Recommendations ..................................................................................................................... 17
         7.1 Development Limitations..................................................................................................................................... 17
         7.2 Earthworks ................................................................................................................................................................. 17
         7.3 Building Foundations ............................................................................................................................................ 18
              7.3.1   Preliminary Site Classification........................................................................................................... 18
              7.3.2   Footing Design....................................................................................................................................... 19
         7.4 Retaining Structures .............................................................................................................................................. 19
         7.5 Drainage ..................................................................................................................................................................... 20
         7.6 Geotechnical Certification of Operational Works ....................................................................................... 20
8.       Wastewater Treatment and Disposal ............................................................................................................. 21
         8.1 Wastewater Flow Design Allowance ................................................................................................................ 21
         8.2 Terrain-Soil Assessment ....................................................................................................................................... 21
         8.3 Existing Wastewater Infrastructure .................................................................................................................. 22
         8.4 Recommendations ................................................................................................................................................. 22
              8.4.1   System Type ............................................................................................................................................ 22
              8.4.2   System Positioning ............................................................................................................................... 23
              8.4.3   System Construction ............................................................................................................................ 24
              8.4.4   Maintenance and Inspection ............................................................................................................ 25



Geotechnical Investigation
10 June 2026 | 26073-001-Rev0                                                                                                                                                              iii