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geotech (1)

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  • Prepared for

    Crest Nicholson

    Isles Quarry, Borough Green Geo-environmental and Geotechnical Ground Conditions Report 2010

    April 2011

  • Crest Nicholson Isles Quarry, Borough Green

    Scott Wilson 6-8 Greencoat Place London SW1P 1PL United Kingdom

    Tel: 0207 798 5000 Fax: 0207 798 5001

    www.scottwilson.com

    This document has been prepared in accordance with the scope of Scott Wilson's appointment with its client and is subject to the terms of that appointment. It is addressed to and for the sole and confidential use and reliance of Scott Wilson's client. Scott Wilson accepts no liability for any use of this document other than by its client and only for the purposes for which it was prepared and provided. No person other than the client may copy (in whole or in part) use or rely on the contents of this document, without the prior written permission of the Company Secretary of Scott Wilson Ltd. Any advice, opinions, or recommendations within this document should be read and relied upon only in the context of the document as a whole. The contents of this document do not provide legal or tax advice or opinion.

    Scott Wilson Ltd 2009

    Revision Schedule

    Geo-environmental and Geotechnical Ground Conditions Report April 2011

    Rev Date Details Prepared by Reviewed by Approved by

    0 June 2010 DRAFT Camille Heckmann Assistant Geo-Environmental Engineer (Geo-environmental Sections)

    Alexander Conrad Engineering Geologist (Geotechnical Sections)

    Carlo Castello Senior Geo-environmental Specialist (Geo-environmental Sections)

    Deneys Schreiner Associate (Geotechnical Sections)

    Steve Handsley Technical Director

    1 April 2011 FINAL Emily Peachey Geo-environmental Specialist

    Carlo Castello Principal Geo-environmental Specialist

    Steve Handsley Technical Director

  • Crest Nicholson Isles Quarry, Borough Green

    Table of Contents

    1 Introduction ..................................................................................... 1 Terms of Reference........................................................................................................ 1 Methodology ................................................................................................................... 1 Information Sources........................................................................................................ 1 List of Previous Investigations Undertaken at the Site .................................................... 2 Proposed Site Use.......................................................................................................... 2 Limitation of the Study and Assessment ......................................................................... 2

    2 Description of Site and Surrounding Area .................................... 3 Location and Site Description ......................................................................................... 3 Surrounding Area ........................................................................................................... 4 Storage of Oils, Fuels and Chemicals ............................................................................. 4 Waste Storage and Disposal .......................................................................................... 4 Electrical Transformers................................................................................................... 4

    3 History of the Site and Surrounding Area ..................................... 5 Site History from Ordnance Survey Maps ....................................................................... 5

    4 Environmental Setting .................................................................... 6 Introduction..................................................................................................................... 6 Geological Mapping ........................................................................................................ 6 Groundwater Vulnerability ............................................................................................... 6 Surface Water Features.................................................................................................. 7 Flooding.......................................................................................................................... 7 Regulatory Entries .......................................................................................................... 7 Water Abstractions ......................................................................................................... 8 Contemporary Trade Directory Entries............................................................................. 8 Fuel Station Entries ......................................................................................................... 8

    5 Summary of Previous Ground Investigations ............................... 9 Scope of Works for Each Investigation ........................................................................... 9 Ground Conditions Encountered During GI Works........................................................ 10 Groundwater Conditions ............................................................................................... 11 Observations of Contamination..................................................................................... 11 Assessment of Contamination Investigation Results..................................................... 11

  • Crest Nicholson Isles Quarry, Borough Green

    6 Preliminary Conceptual Site Model and Data Gap Assessment ................................................................................... 14 Contamination Sources ................................................................................................ 14 Data Gaps and Requirements for Additional Investigations .......................................... 16

    7 2010 Ground Investigation Works Package ................................ 17 Scope of Works ............................................................................................................ 17 Drilling Investigation...................................................................................................... 17 Monitoring Well Installations ......................................................................................... 18 Geo-environmental Laboratory Testing......................................................................... 19 Geotechnical Laboratory Testing .................................................................................. 19

    8 Assessment of Geology and Hydrogeology................................ 21 Ground Conditions........................................................................................................ 21 Strata Description ......................................................................................................... 22 Hydrogeology ............................................................................................................... 23

    9 Contamination Results ................................................................. 26 Contamination Observations......................................................................................... 26 Laboratory Contamination Results Soils .................................................................... 26 Laboratory Contamination Results Leachates............................................................ 31 Laboratory Contamination Results - Groundwater ........................................................ 32 Ground Gas Assessment.............................................................................................. 33

    10 Refined CSM and Risk Assessment............................................. 35 Refined Conceptual Site Model..................................................................................... 35 Risk Assessment .......................................................................................................... 36

    11 Geotechnical Properties ............................................................... 41 Made Ground................................................................................................................ 41 Hythe Beds................................................................................................................... 53

    12 Geotechnical Evaluation............................................................... 56 Proposed Development ................................................................................................ 56 Foundations.................................................................................................................. 56 Settlements................................................................................................................... 59 Earthworks and Slope Stability ..................................................................................... 61 Groundwater During Construction................................................................................. 63 Concrete in Aggressive Ground.................................................................................... 64

    13 Conclusions and Recommendations........................................... 65

  • Crest Nicholson Isles Quarry, Borough Green

    Geo-environmental Conclusions and Recommendations including Remediation Options ......................................................................................................................... 65 Geotechnical Conclusions ............................................................................................ 67

    Appendices:

    Appendix A: Exploratory Hole Loca