AG2437-16-Y63 REPORT ON GROUND INVESTIGATION AT ISEBROOK SEN COLLEGE, KETTERING REPORT STATUS SHEET Client: Northamptonshire County Council Report Title: Report on Ground Investigation at Isebrook SEN College, Kettering Report Number: AG2437-16-Y63 Report Status: Validated Issue 1 Date: April 2016 Date Signed for and on behalf of Applied Geology Limited Report G Manning BSc (Hons) MSc FGS 25/05/2016 Author Project Geologist Checked A Perks MGeol (Hons), FGS 25/05/2016 Senior Engineering Geologist Authorised S Day BSc (Hons) MSc CGeol FGS SiLC Director 25/05/2016 AG2437-16-Y63 APPLiED GEOLOGY Isebrook SEN College, Kettering CONTENTS 1.0 INTRODUCTION ........................................................................................................ 1 1.1 Objectives and Scope of Investigation ....................................................................................1 1.2 Report Layout ..........................................................................................................................1 2.0 SITE DESCRIPTION AND PROPOSALS .................................................................. 2 2.1 Site Description........................................................................................................................2 2.2 Site Proposals ..........................................................................................................................2 3.0 DESK STUDY INFORMATION .................................................................................. 3 4.0 CONCEPTUAL SITE MODEL .................................................................................... 4 4.1 Diagrammatical Illustration ......................................................................................................4 4.2 Sources ....................................................................................................................................4 4.3 Pathways .................................................................................................................................4 4.4 Receptors ................................................................................................................................4 4.5 Source/Pathway/Receptor Linkage and Assessed Risk .........................................................5 5.0 GROUND INVESTIGATION WORKS ........................................................................ 5 5.1 Fieldwork .................................................................................................................................5 5.2 Instrumentation and Monitoring ...............................................................................................6 5.3 Laboratory Testing ...................................................................................................................6 6.0 GROUND CONDITIONS ............................................................................................ 7 6.1 Strata Encountered ..................................................................................................................7 6.2 Topsoil & Made Ground ...........................................................................................................7 6.3 Whitby Mudstone Formation ....................................................................................................8 6.4 Groundwater and Variable Head Tests ...................................................................................8 6.5 Contamination ..........................................................................................................................8 7.0 GEOENVIRONMENTAL ASSESSMENT ................................................................... 9 7.1 Human Health Risk Assessment .............................................................................................9 7.2 Controlled Waters Risk Assessment .......................................................................................9 7.3 Disposal of Soil Arisings ..........................................................................................................9 7.4 Conclusions and Recommendations .......................................................................................9 8.0 GEOTECHNICAL ASSESSMENT ........................................................................... 10 8.1 General ................................................................................................................................. 10 8.2 Foundation Design ............................................................................................................... 10 8.3 Floor Slab and Gas Protection ............................................................................................. 10 8.4 Excavations .......................................................................................................................... 11 8.5 Pavement Design ................................................................................................................. 11 8.6 Soakaways ........................................................................................................................... 11 8.7 Buried Concrete and Services .............................................................................................. 12 8.8 Conclusions and Recommendations .................................................................................... 12 GENERAL NOTES LIST OF REFERENCES APPENDICES APPENDIX A DRAWINGS & FIGURES • Site Location Plan • Exploratory Hole Location Plan, Dwg No AG2437-16-01 • Conceptual Site Model, Dwg No AG2437-16-02 • Proposed Extensions & Alterations, B3 Architects Dwg No 91428 P1 Rev C • SPT N value v depth • Plasticity chart AG2437-16-Y63 APPLiED GEOLOGY Isebrook SEN College, Kettering APPENDIX B DESK STUDY DATA APPENDIX C EXPLORATORY HOLE LOGS APPENDIX D FIELD MONITORING AND IN SITU TEST RESULTS APPENDIX E LABORATORY TEST RESULTS & DATA SHEETS APPENDIX F STANDARD FIELDWORK AND ASSESSMENT PROCEDURES AG2437-16-Y63 APPLiED GEOLOGY Isebrook SEN College, Kettering Page 1 1.0 INTRODUCTION 1.1 Objectives and Scope of Investigation An area of land at Isebrook SEN College, Kettering (the site) is being considered for redevelopment by Northamptonshire County Council (the Client). The proposals for the site comprise the construction of a new two story building and associated external works for the College. Applied Geology was appointed by the Client to undertake a desk study/Phase I Environmental Risk Assessment and combined geotechnical and geoenvironmental investigation in order to: • assess the potential for hazardous substances or conditions to exist at the site that might warrant mitigation or remediation appropriate to the intended end use proposed by the Client. • establish geological conditions and geotechnical parameters to assist in the safe and economic engineering design of the proposed development. • Support a planning application. The terms of reference/brief for the works were specified by JPP Consulting on behalf of Lend Lease Consulting (Client’s Engineer) and are outlined in our proposal and estimate reference AG16-5227let001 dated 9th March 2016. The scope of works undertaken by Applied Geology comprised: • A site inspection and walkover survey • A review of the following desk study sources: GroundSure – GeoInsight & EnviroInsight environmental databases. GroundSure – MapInsight historical maps. British Geological Survey (BGS) - published information & on-line borehole database. Multi-Agency Geographical Information for the Countryside (MAGIC) on- line database. Environment Agency Web Site. • Ground investigation together with sampling, monitoring and a programme of laboratory testing. • Assessment and reporting of the results of the works. Underground service plans for the site were obtained by Applied Geology on 17th March 2016 and a utility survey drawing (with topographic survey information) dated November 2015 created by Subsight Survey Ltd was provided by the Client. 1.2 Report Layout This report presents a brief description of the site, the desk study data and the factual results of the intrusive investigations carried out. An interpretation of the ground conditions and a discussion/assessment of the findings is presented in the later report text sections. The main text of the report has been produced in a AG2437-16-Y63 APPLiED GEOLOGY Page 2 Isebrook SEN College, Kettering concise format, including the use of data tables to summarise key information where possible. The report should be read in conjunction with the general procedures detailed in Appendix F and General Notes given at the end of the main text, which provide details of investigation techniques, assessment methodology and standards, health & safety and limitations and exceptions of the report. Drawings and factual data including exploratory hole records, laboratory testing results and desk study records are presented in the other Appendices. 2.0 SITE DESCRIPTION AND PROPOSALS 2.1 Site Description The site is located at Isebrook SEN College, Kettering, approximately 1.6km southeast of Kettering town centre. The national grid reference for the centre of the site is 488076 277412 as shown on the Site Location Plan in Appendix A. The site was bound to the north by residential properties off Eastleigh Road, to the east by agricultural land and the River Ise, to the south by Barton Road and Wickstead Park beyond and to the west by St Edward’s Primary School. The site is irregular in shape with dimensions of