Preliminary Risk Assessment
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West Yorkshire Police Bishopgarth, Westfield Road, Wakefield Preliminary risk assessment 301469 JULY 2014 RSK GENERAL NOTES Project No.: 301469-01 (00) Title: Preliminary risk assessment: Bishopgarth, Westfield Road, Wakefield Client: West Yorkshire Police Date: July 2014 Office: Castleford Tel: 01977 552255, contact: John Harrison Status: Final Author Jennifer Wood Technical reviewer Paul Taunton Signature pp Signature Date: July 2014 Date: July 2014 Quality reviewer Project manager John Harrison [optional] Signature Signature Date: July 2014 Date: RSK Environment Limited (RSK) has prepared this report for the sole use of the client, showing reasonable skill and care, for the intended purposes as stated in the agreement under which this work was completed. The report may not be relied upon by any other party without the express agreement of the client and RSK. No other warranty, expressed or implied, is made as to the professional advice included in this report. Where any data supplied by the client or from other sources have been used, it has been assumed that the information is correct. No responsibility can be accepted by RSK for inaccuracies in the data supplied by any other party. The conclusions and recommendations in this report are based on the assumption that all relevant information has been supplied by those bodies from whom it was requested. No part of this report may be copied or duplicated without the express permission of RSK and the party for whom it was prepared. Where field investigations have been carried out, these have been restricted to a level of detail required to achieve the stated objectives of the work. This work has been undertaken in accordance with the quality management system of RSK Environment Ltd. CONTENTS 1 INTRODUCTION.............................................................................................................................. 3 1.1 Background.............................................................................................................................. 3 1.2 Objective .................................................................................................................................. 3 1.3 Scope....................................................................................................................................... 3 1.4 Existing reports ........................................................................................................................ 4 2 THE SITE......................................................................................................................................... 5 2.1 Site location and description.................................................................................................... 5 2.2 Proposed development............................................................................................................ 5 3 PRELIMINARY RISK ASSESSMENT (PRA).................................................................................. 6 3.1 Site walkover............................................................................................................................ 6 3.1.1 Environmental .............................................................................................................. 6 3.1.2 Geotechnical/ Structural............................................................................................... 7 3.2 Ground conditions.................................................................................................................... 7 3.2.1 Geology........................................................................................................................ 7 3.2.2 Radon........................................................................................................................... 8 3.2.3 Mining and quarrying ................................................................................................... 8 3.2.4 Landfilling and land reclamation .................................................................................. 8 3.2.5 Ground gas .................................................................................................................. 8 3.3 Hydrogeology........................................................................................................................... 8 3.3.1 Aquifer characteristics.................................................................................................. 8 3.3.2 Vulnerability of groundwater resources ....................................................................... 9 3.3.3 Licensed groundwater abstraction............................................................................... 9 3.4 Hydrology............................................................................................................................... 10 3.4.1 Surface watercourses ................................................................................................ 10 3.4.2 Surface water abstractions ........................................................................................ 10 3.4.3 Site drainage.............................................................................................................. 10 3.4.4 Preliminary flood risk assessment ............................................................................. 10 3.5 History of site and surrounding area...................................................................................... 10 3.6 Sensitive land uses ................................................................................................................ 12 3.7 Licences and permissions...................................................................................................... 12 3.8 Initial conceptual model ......................................................................................................... 12 3.8.1 Summary of potential contaminant sources............................................................... 12 3.8.2 Sensitive receptors .................................................................................................... 12 3.8.3 Summary of plausible pathways ................................................................................ 12 3.8.4 Potentially complete pollutant linkages...................................................................... 14 4 CONCLUSIONS AND RECOMMENDATIONS............................................................................. 17 4.1 Environmental and Geotechnical........................................................................................... 17 4.2 Other ...................................................................................................................................... 17 BIBLIOGRAPHY .................................................................................................................................. 18 West Yorkshire Police 1 Preliminary risk assessment: Bishopgarth, Westfield Lane, Wakefield 301469-01 (00) TABLES Table 1: Site setting................................................................................................................................ 5 Table 2: Geology at the site.................................................................................................................... 7 Table 3: Groundwater abstractions ........................................................................................................ 9 Table 4: Surface water abstractions..................................................................................................... 10 FIGURES Figure 1 Site location map Figure 2 Site layout plan Figure 3 Initial conceptual site model APPENDICES Appendix A Service constraints Appendix B Summary of legislation and policy relating to contaminated land Appendix C Walkover checklist Appendix D British Geological Survey borehole records Appendix E Environmental database report Appendix F Risk assessment methodology West Yorkshire Police 2 Preliminary risk assessment: Bishopgarth, Westfield Lane, Wakefield 301469-01 (00) 1 INTRODUCTION RSK Environment Limited (RSK) was commissioned by West Yorkshire Police to carry out a preliminary risk assessment of land at Bishopgarth, Westfield Road, Wakefield. It is understood that the site is being considered for residential development. This report is subject to the RSK service constraints given in Appendix A. 1.1 Background The site is currently occupied by an active training facility comprising several buildings, areas of soft landscaping and hardstanding areas. We understand that the majority of the buildings on the site are likely to be demolished. 1.2 Objective The objective of the PRA is to identify potential liabilities associated with redevelopment of the site. The aim of the PRA is to collate information pertaining to the site from which sources of contamination, receptors that may be impacted and pathways between the two are identified. Where all three are present, these are termed potentially complete contaminant linkages. In accordance with UK guidance including CLR11 and BS 10175, these are presented in a conceptual model and an evaluation of the risk associated with each contaminant linkage is made. 1.3 Scope The scope of the investigation and layout of this report has been designed with consideration of CLR11 (Environment Agency, 2004) and BS 10175: 2011 (BSI, 2011) and guidance on land contamination reports issued by the Environment Agency (EA) (2010). The project was carried out to an agreed