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Geo-Environmental Site Assessment

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Geo-Environmental Site Assessment Application for Residential Development at Mitton Road, Whalley Geo-Environmental Site Assessment July 2012 RSK GENERAL NOTES Project No.: 17134-R1 (00) Title: Geo-Environmental Site Assessment, Mitton Road, Whalley, Lancashire Client: David Wilson Homes Northwest Date: April 2012 Office: Helsby Status: Final Ian Wilson / Author Mohammed Yusuf Technical reviewer Svetislav Trajkovski[i1] Signature Signature Date: April 2012 Date: April 2012 Project manager Karl Hall Signature Date: April 2012 RSK Environment (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. David Wilson Homes Northwest Geo-Environmental Site Assessment, Mitton Road, Whalley, Lancashire Reference: 17134-R1 (00) CONTENTS 1 INTRODUCTION..............................................................................................................................1 1.1 Objective ..................................................................................................................................1 1.2 Scope of works.........................................................................................................................1 1.3 Limitations ................................................................................................................................2 2 SITE DETAILS .................................................................................................................................3 2.1 Site location and description ....................................................................................................3 2.2 Proposed redevelopment .........................................................................................................3 3 PRELIMINARY RISK ASSESSMENT .............................................................................................4 3.1 Geology ....................................................................................................................................4 3.2 Hydrogeology ...........................................................................................................................4 3.2.1 Groundwater abstractions ...........................................................................................4 3.2.2 Groundwater vulnerability............................................................................................4 3.3 Hydrology .................................................................................................................................5 3.3.1 Surface water abstractions..........................................................................................5 3.3.2 Flooding.......................................................................................................................5 3.4 Sensitive land uses ..................................................................................................................5 3.5 Landfills, waste and licences....................................................................................................5 3.5.1 Historical and non-operational landfills .......................................................................5 3.6 Site history review ....................................................................................................................6 3.6.1 Historic maps...............................................................................................................6 3.6.2 Database and regulatory information ..........................................................................7 3.7 Site walkover............................................................................................................................8 4 INITIAL CONCEPTUAL MODEL.....................................................................................................9 4.1 Potential contaminant sources .................................................................................................9 4.1.1 Potential on-site sources .............................................................................................9 4.1.2 Potential off-site sources .............................................................................................9 4.2 Sensitive receptors...................................................................................................................9 4.3 Summary of plausible pathways ............................................................................................10 4.4 Potentially complete pollutant linkages ..................................................................................10 4.5 Preliminary risk assessment conclusions and recommendations..........................................14 5 SITE INVESTIGATION ..................................................................................................................15 5.1 Investigation methodology .....................................................................................................15 5.2 Health and safety considerations...........................................................................................15 5.3 Soil sampling and testing .......................................................................................................16 5.4 Standpipe installations ...........................................................................................................16 5.5 Ground gas monitoring...........................................................................................................16 5.6 Groundwater sampling ...........................................................................................................17 6 RESULTS.......................................................................................................................................18 6.1 Ground conditions ..................................................................................................................18 6.1.1 Topsoil.......................................................................................................................18 6.1.2 Made ground .............................................................................................................18 David Wilson Homes Northwest i Geo-Environmental Site Assessment, Mitton Road, Whalley, Lancashire Reference: 17134-R1 (00) 6.1.3 Superficial deposits ...................................................................................................18 6.1.4 Groundwater..............................................................................................................19 6.1.5 Observed contamination ...........................................................................................19 6.2 Chemical laboratory analysis .................................................................................................19 6.3 Geotechnical laboratory testing..............................................................................................20 6.4 Groundwater gauging.............................................................................................................20 6.5 Ground gas monitoring results...............................................................................................20 7 QUANTITATIVE RISK ASSESSMENT .........................................................................................22 7.1 Conceptual model ..................................................................................................................22 7.2 Human health.........................................................................................................................23 7.2.1 Soil - pollutant linkage (1)..........................................................................................23 7.2.2 Groundwater pollutant linkage (1) .............................................................................23 7.2.3 Water supply pipes – pollutant linkage (5) ................................................................23 7.2.4 Ground gas - pollutant linkage (6 & 7) ......................................................................23 7.3 Controlled waters ...................................................................................................................24 7.3.1 Pollutant linkage (2) (3) & (4) ....................................................................................24 7.4 Refined conceptual model......................................................................................................25
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