K4 Kemsley Site Condition Report & Baseline Assessment – Epr/Bj3951g
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K4 KEMSLEY SITE CONDITION REPORT & BASELINE ASSESSMENT – EPR/BJ3951G E.ON CHP Limited JER1679 K4 Kemsley Site Condition Report & Baseline Assessment Final 25 April 2019 rpsgroup.com REPORT Document status Review Version Purpose of document Authored by Reviewed by Approved by date Site Condition report and Final VO/TC JS/GM JS 25/04/19 Baseline Assessment Approval for issue Jennifer Stringer 25 April 2019 © Copyright RPS Group Plc. All rights reserved. The report has been prepared for the exclusive use of our client and unless otherwise agreed in writing by RPS Group Plc, any of its subsidiaries, or a related entity (collectively 'RPS'), no other party may use, make use of, or rely on the contents of this report. The report has been compiled using the resources agreed with the client and in accordance with the scope of work agreed with the client. No liability is accepted by RPS for any use of this report, other than the purpose for which it was prepared. The report does not account for any changes relating to the subject matter of the report, or any legislative or regulatory changes that have occurred since the report was produced and that may affect the report. RPS does not accept any responsibility or liability for loss whatsoever to any third party caused by, related to or arising out of any use or reliance on the report. RPS accepts no responsibility for any documents or information supplied to RPS by others and no legal liability arising from the use by others of opinions or data contained in this report. It is expressly stated that no independent verification of any documents or information supplied by others has been made. RPS has used reasonable skill, care and diligence in compiling this report and no warranty is provided as to the report’s accuracy. No part of this report may be copied or reproduced, by any means, without the prior written consent of RPS. Prepared by: Prepared for: RPS E.ON CHP Limited Valentina Osella – Senior Consultant Andrew Llewellyn Tim Colebrook - Senior Consultant Site Manager 260 Park Avenue Kemsley CHP, Kemsley Almondsbury, Bristol BS32 4SY Sittingbourne, Kent, ME10 2SG T 01454 853 000 T 07841 057713 E [email protected] E [email protected] JER1679 | K4 Kemsley Site Condition Report & Baseline Assessment | Final | 25 April 2019 rpsgroup.com REPORT Contents 1 INTRODUCTION ........................................................................................................................... 1 1.1 Background ................................................................................................................................... 1 1.2 Objective ....................................................................................................................................... 1 1.3 Historical Reporting & Limitations ................................................................................................. 2 1.4 Report Structure ............................................................................................................................ 3 2 ASSESSMENT OF SITE – SPECIFIC POLLUTION POTENTIAL .............................................. 4 2.2 Risk Matrix for Determining Site-specific Pollution Potential ........................................................ 5 2.3 Site Location ................................................................................................................................. 7 2.4 Proposed Operations and Layout of the K4 site ........................................................................... 7 2.5 Hazardous Materials Inventory ..................................................................................................... 8 2.6 Stage 3: Site-specific Pollution Potential Associated with RHS.................................................. 11 3 SITE HISTORY ........................................................................................................................... 16 3.1 Introduction ................................................................................................................................. 16 3.2 Land-use on the K4 Site.............................................................................................................. 16 3.3 Surrounding Land-use on the K4 Site ......................................................................................... 17 3.4 Pollution History .......................................................................................................................... 30 3.5 Potential for the Release of Hazardous Substances .................................................................. 32 3.6 Surface Water Drainage.............................................................................................................. 34 3.7 Process Water Drainage ............................................................................................................. 34 4 CONDITION OF THE LAND AT PERMIT APPLICATION ......................................................... 35 4.1 Environmental Setting ................................................................................................................. 35 5 BASELINE QUALITY ASSESSMENT ....................................................................................... 39 5.1 Site Reconnaissance .................................................................................................................. 39 5.2 Summary of Historical Intrusive Investigations ........................................................................... 40 5.3 Baseline Soil and Groundwater Reference Data ........................................................................ 43 5.4 Made Ground .............................................................................................................................. 44 5.5 Made Ground and Shallow Natural Ground ................................................................................ 46 5.6 Baseline Land Quality ................................................................................................................. 50 5.7 Baseline Groundwater Quality .................................................................................................... 50 5.8 Baseline Gas Assessment .......................................................................................................... 52 6 CONCEPTUAL SITE MODEL .................................................................................................... 54 6.1 Introduction ................................................................................................................................. 54 6.2 Conclusions ................................................................................................................................. 59 REFERENCES ............................................................................................................................................ 61 Tables Table 2.1: Risk Matrix for Determining Site-specific Pollution Potential ....................................................... 6 Table 2.2: Contaminants of Concern Associated with RHS ........................................................................ 11 Table 2.3: Assessment of Site-specific Pollution Potential ......................................................................... 13 Table 3.1: Summary of Registered Historical and Active Landfill Site ........................................................ 18 Table 3.2: Discharge Consents ................................................................................................................... 21 Table 3.3: Statutory Designated Sites ......................................................................................................... 22 Table 3.4: Summary of Registered Permitted Sites .................................................................................... 23 Table 3.5: Additional Environmental Permits .............................................................................................. 29 Table 3.6: Summary of Pollution Incidents to Controlled Waters ................................................................ 30 JER1679 | K4 Kemsley Site Condition Report & Baseline Assessment | Final | 25 April 2019 rpsgroup.com REPORT Table 3.7: Contaminants of Concern Associated with RHS and Historical Land-use ................................. 33 Table 4.1: Published Geological Information ............................................................................................... 36 Table 5.1: Encountered Ground Conditions ................................................................................................ 41 Table 5.2: Summary of Soil Analytical Results for Heavy Metals ............................................................... 44 Table 5.3: Summary of Soil Analytical Results for PAH Compounds ......................................................... 46 Table 5.4: Summary of Soil Analytical Results for TPH .............................................................................. 47 Table 5.5: Ashdown Soil Screening Values for petroleum hydrocarbon equivalent carbon weight fractions ....................................................................................................................................................... 48 Table 5.6: Ashdown Soil Screening Values for BTEX compounds ............................................................. 48 Table 5.7: Summary of Groundwater Analytical Results for Heavy Metals ...............................................