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Appendix 4 – Geotechnical Engineering Report APPENDICES APPENDIX 4 – GEOTECHNICAL ENGINEERING REPORT 14 K190371-2 22 June 2020 GEOTECHNICAL ENGINEERING INVESTIGATION PROPOSED SCHOOL REDEVELOPMENT 766-778 SANDRINGHAM ROAD EXTENSION MOUNT ROSKILL Prepared For: MOAA Architects Level 1, 3135 Ward Street Hamilton 3204 KGA Geotechnical Group Limited Supporting the Construction Industry since 1990 7A William Pickering Drive | Albany | Auckland Unit 3, 201 Opawa Road | Hillsborough | Christchurch P O Box 302 361 | North Harbour | Auckland 0751 P O Box 7630 | Sydenham | Christchurch 8240 09 478 6655 www.kga.co.nz 03 343 5302 EXECUTIVE SUMMARY Geotechnical Engineering Investigation Proposed School Redevelopment 766-778 Sandringham Road Extension Mount Roskill Geology Auckland Volcanic Field deposits Lithology Silt, clayey silt and basalt SUBSOIL CONDITIONS Groundwater depth at time 3m to 6.7m (As per percussion boreholes at the time of (See borehole logs for of investigation drilling) details) Shrink/swell classification Class S (Wesley Intermediate) and Class H (CASS) (NZBC Structure B1/AS1) Soil classification as per Class B (Wesley Intermediate) and Class C (CASS) NZS 1170.5:2004 SITE STABILITY Provided the foundations are designed using the suggested geotechnical parameters in COMMENT this report, permanent site stability is deemed not to be a concern at the site. Any proposed excavation or cuts should consider the presence of basalt rock at the development, Excavation into the fractured slightly weathered to unweathered basalt rock may be difficult using standard methods and consideration for more rigorous excavation SITE FORMATION methods such as ripping and hammer methods may be required. CONSTRAINTS Where non-engineered fill is present beneath proposed structures, it should either be removed and replaced with engineered fill to NZS4431:1989 standards, or the structure designed to found below any non-engineered fills, Public underground services are present at the site, and their location will need to be considered in the design of the foundations for the relevant structures. Wesley Intermediate: We recommend that the proposed three storey structure be supported on foundations taken onto or into the underlying basalt rock. Based on our site investigation the depth of rock in this area ranges from 1m to 3m, however this may vary PRELIMINARY away from the points explored. FOUNDATION RECOMMENDATIONS CASS: Structures are anticipated to be single level to two storeys. For preliminary design (see Section 8.5 for purposes we recommend that the structures be supported on shallow foundations. Due complete text) to the potential for the structures to span areas of deep and shallow basalt, perimeter and isolated foundations should either be founded to a depth of 900mm below lowest cleared adjacent ground or be founded onto the underlying basalt rock, if encountered at shallower depths. We recommend that prior to construction, and following demolition of the existing FUTURE WORKS structures, proof drilling (percussion drill) be undertaken across the proposed building platforms to confirm the presence / depth of rock. REPORT A full copy of this report must be provided to all relevant parties involved in the project. This should include, but not be limited to, owner, architectural designers, engineers (civil DISTRIBUTION and structural) and the earthworks/building contractor. Geotechnical Engineering Investigation K190371-2 Proposed School Redevelopment - 766-778 Sandringham Road Extension, Mount Roskill 22 June 2020 CONTENTS 1. INTRODUCTION ............................................................................................................................... 1 2. SITE DESCRIPTION ......................................................................................................................... 1 3. PROPOSED DEVELOPMENT .......................................................................................................... 2 4. DESK STUDY .................................................................................................................................... 3 5. SUBSURFACE INVESTIGATION ..................................................................................................... 4 6. SUBSURFACE CONDITIONS .......................................................................................................... 5 6.1 Strata Encountered ............................................................................................................... 5 6.2 Geological Model .................................................................................................................. 8 7. GEOHAZARDS AND GEOTECHNICAL ASSESSMENT ................................................................ 8 7.1 Liquefaction Potential ........................................................................................................... 8 7.2 Seismic Site Classification .................................................................................................... 9 7.2.1. Wesley Intermediate ............................................................................................................. 9 7.2.2. CASS Development .............................................................................................................. 9 7.3 Expansive Soils ..................................................................................................................... 9 8. GEOTECHNICAL RECOMMENDATIONS .....................................................................................10 8.1 General ...............................................................................................................................10 8.2 Geotechnical Constraints ....................................................................................................10 8.3 Site Formation Works .........................................................................................................10 8.3.1. General ...............................................................................................................................10 8.3.2. Excavations .........................................................................................................................10 8.3.3. Filling ...................................................................................................................................14 8.4 Geotechnical Design Parameters .......................................................................................14 8.5 Foundation Recommendations ...........................................................................................15 8.5.1. Wesley Intermediate Structure ...........................................................................................15 8.5.2. CASS Structures .................................................................................................................15 8.5.1. Settlements .........................................................................................................................16 8.5.2. Expansive soils ...................................................................................................................16 8.5.3. Bridging Over Public Underground Services ......................................................................17 8.6 Retention .............................................................................................................................17 8.7 Pavement Design................................................................................................................18 8.8 Construction Considerations ...............................................................................................18 9. STORMWATER ...............................................................................................................................18 10. FUTURE WORKS ...........................................................................................................................19 11. LIMITATIONS ..................................................................................................................................19 REFERENCES ..........................................................................................................................................20 Geotechnical Engineering Investigation K190371-2 Proposed School Redevelopment - 766-778 Sandringham Road Extension, Mount Roskill 22 June 2020 Drawings: Sheet 1 Site Plan Sheet 2 Geological Sections A-A’ and B-B’ Appendices: Appendix A MOAA Architects Draft Master Plan Design Drawings Appendix B Machine Borehole Logs with Core Photographs Appendix C Percussion Borehole Logs Appendix D Borehole Logs from Previous Feasibility Assessment Investigation Appendix E Relevant NZGS Historic Machine Borehole Data Geotechnical Engineering Investigation K190371-2 Proposed School Redevelopment - 766-778 Sandringham Road Extension, Mount Roskill 22 June 2020 1. INTRODUCTION At the instruction of MOAA Architects (MOAA) we have undertaken a geotechnical engineering investigation for the proposed school redevelopment at 766-778 Sandringham Road Extension, Mount Roskill. The scope of the current investigation was to build on existing geotechnical data available for the site from our previous site investigations (summarised in Section 4). As part of this investigation we have conducted further subsurface investigation using a combination of machine operated rotary drilled boreholes and percussion drilled boreholes systematically across the site. The information has been
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