Queens Arcade Shopping Centre Phase 1 Ground Conditions Desk Study
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Queens Arcade Shopping Centre Phase 1 Ground Conditions Desk Study Sapphire QAC Holdings S.E.N.C Date: 29 January 2021 Doc ref: QSA-HYD-XX-XX-GE-RP-0001 DOCUMENT CONTROL SHEET Issued by Hydrock Consultants Limited Tel: 02920 023665 Castlebridge 5 E-mail: [email protected] 5-19 Cowbridge Road East www.hydrock.com Cardiff CF11 9AB Client Sapphire QAC Holdings S.E.N.C Project name Queens Arcade Shopping Centre Title Phase 1 Ground Conditions Desk Study BIM reference QSA-HYD-XX-XX-GE-RP-0001 Project reference C-12310-C Date 29/01/2021 Document Production Record Status and Revision P3 S2 Name Prepared by Dickon Morris BSc (Hons) MSc FGS Checked by Matthew Holbourn BSc (Hons) MSc FGS Approved by Alexandra Edwards Bsc (Hons) MSc FGS Document Revision Record Status Revision Date Revision Details S2 P1 29/01/2021 Final S2 P2 01/04/2021 Revision following client comment S2 P3 12/04/2021 Scheme name change. S2 P4 15/07/2021 Scheme name change and updated planning application details. Hydrock Consultants Limited (Hydrock) has prepared this report in accordance with the instructions of the above-named Client, under the terms of appointment for Hydrock, for the sole and specific use of the Client and parties commissioned by them to undertake work where reliance is placed on this report. Any third parties who use the information contained herein do so at their own risk. Hydrock shall not be responsible for any use of the report or its contents for any purpose other than that for which it was prepared or for use of the report by any parties not defined in Hydrock’s appointment. Queens Arcade Shopping Centre| Sapphire QAC Holdings S.E.N.C | Phase 1 Ground Conditions Desk Study | QSA-HYD-XX-XX-GE-RP-0001 | 29 January 2021 i CONTENTS 1. INTRODUCTION ........................................................................................................................................... 1 2. PHASE 1 STUDY (DESK STUDY AND FIELD RECONNAISSANCE) .................................................................... 4 3. OUTLINE CONCEPTUAL SITE MODEL ......................................................................................................... 15 4. DESK STUDY CONCLUSIONS ...................................................................................................................... 18 5. PRELIMINARY DEVELOPMENT CONSTRAINTS ........................................................................................... 19 6. UNCERTAINTIES AND LIMITATIONS .......................................................................................................... 21 7. RECOMMENDATIONS FOR FURTHER WORK ............................................................................................. 22 8. REFERENCES .............................................................................................................................................. 23 Appendices Appendix A Drawings Appendix B Field Reconnaissance Photographs Appendix C Historical Ordnance Survey Maps Appendix D Desk Study Research Information Appendix E Preliminary Geotechnical Risk Register Appendix F Plausible Source-Pathway-Receptor Contaminant Linkages Appendix G Hydrock Methodologies Tables Table 2.1: Site referencing information ................................................................................................................... 4 Table 2.2: Site description ........................................................................................................................................ 5 Table 2.3: Site history review ................................................................................................................................... 5 Table 2.4: Geology ................................................................................................................................................... 7 Table 2.5: Aquifer system ........................................................................................................................................ 9 Table 2.6: Groundwater abstractions ...................................................................................................................... 9 Table 2.7: Surface water features .......................................................................................................................... 10 Table 2.8: Surface water abstractions .................................................................................................................... 10 Table 2.9: Surface water discharges ...................................................................................................................... 11 Table 2.10: Waste management sites .................................................................................................................... 12 Table 2.11: Regulatory information within 500m of the site ................................................................................. 12 Table 2.12: Natural soil chemistry .......................................................................................................................... 13 Table 2.13: Non-specialist UXO screening (for the purposes of ground investigation) .......................................... 14 Table 4.1: Possible Pollutant Linkages (for Risk Levels of Moderate or Greater) ................................................... 18 Table 5.1: Preliminary development constraints / recommendations (at Desk Study stage) ................................ 19 Queens Arcade Shopping Centre| Sapphire QAC Holdings S.E.N.C | Phase 1 Ground Conditions Desk Study | QSA-HYD-XX-XX-GE-RP-0001 | 29 January 2021 i Figures Figure 2.1: Site location ........................................................................................................................................... 4 Figure 2.2: Extract from the Ordnance Survey Map................................................................................................. 4 Figure 2.3: Superficial deposits. ............................................................................................................................... 8 Figure 2.4: Solid geology. ......................................................................................................................................... 8 Queens Arcade Shopping Centre| Sapphire QAC Holdings S.E.N.C | Phase 1 Ground Conditions Desk Study | QSA-HYD-XX-XX-GE-RP-0001 | 29 January 2021 ii EXECUTIVE SUMMARY SITE INFORMATION AND SETTING Objectives The works have been commissioned to provide an initial assessment of the potential ground conditions at the site from an environmental and geotechnical perspective and to support a hybrid planning application by Sapphire QAC Holdings S.E.N.C. Client Sapphire QAC Holdings S.E.N.C Site name and Queens Arcade Shopping Centre, Queen Street, Cardiff CF10 2BY location Proposed The site development proposals are understood to comprise a mixed use development development comprising a hotel of circa eight storeys and residential development of circa 14 storeys with commercial space on the lower floors. This will include the demolition of the existing arcade to ground floor level with the existing basement and basement foundations retained. Where no basement is present it is understood that demolition will be to ground level but that piles and pile caps of existing foundations are likely to be retained. PHASE 1 (DESK STUDY AND SITE RECONNIASANCE) Ground Model The site is currently entirely occupied by the existing Queens Arcade which is a covered shopping centre with a variety of shops on two levels. The site is approximately 0.9 ha in area, roughly level and set at an altitude of around 12m AOD. It is bounded by Working Street to the west, Queens Street to the north, other shops to the east and the St David’s Shopping Centre to the south. The buildings are of an age such that they may contain asbestos. Review of historical Ordnance Survey mapping indicates: • In the earliest mapping from 1880 the site was occupied by terraced buildings. There was an area of open ground near the centre of the site and a number of streets crossed the site that no longer exist. The former town moat (sometimes referred to as the Glamorganshire Canal) also crossed the eastern part of the site but the northern 80% of the section on site was covered at the time. • By the 1900s buildings had been constructed in the centre of the site. • By the end of the 1950s the moat running through the site is indicated to have been filled in and an electric substation has been built in the south east corner of the site. • During the 1990s the buildings at the site were demolished and the existing Queens Arcade built in their place. A non-specialist UXO assessment indicates a moderate bomb risk. The geology at the site consists of Made Ground underlain by Glaciofluvial Sheet Deposits which are in turn underlain by the Mercia Mudstone Group. A historic borehole notes groundwater at around 6m bgl. The Glaciofluvial Sheet Deposits comprise a Secondary A Aquifer and the Mercia Mudstone Group comprises a Secondary B Aquifer. The Dock Feeder Canal flows west to east approximately 230m north of the site and the River Taff flows from north to south approximately 500m west of the site. ASSESSMENT AND CONCLUSIONS Preliminary The following plausible geotechnical risks are identified. Geotechnical • Variable Made Ground - settlement or differential settlement of foundations, floor slabs, Hazards roads and infrastructure elements. A variety of Made Ground is to be expected across the