Springwell Village, Sunderland. Ground Investigation Interpretive Report Hellens Group / Homes by Esh Issue V5 March 2021 Springwell Village Sunderland Ground Investigation Interpretive Report Project Reference: 2369 Client Hellens Group / Homes by Esh Our Reference 2369 – Springwell Village Produced by Emmanuel Barreto Checked by Mike Taylor Submitted Issue V5 – March 2021 Report checked: Report Author: ‘Shadbolt Group’ is a trading name of ‘Shadbolt Consulting Ltd’ Company Number 8819849 Shadbolt Group, 18 Bewick Road, Sunderland, NE8 4DP T: (0191) 478 3330 W: www.shadboltgroup.net CONTENTS 0.0 REPORT SUMMARY ................................................................................................................................... iv 1.0 INTRODUCTION .........................................................................................................................................1 1.1 Aims and Objectives ..................................................................................................................................................... 1 1.2 Scope of Works ............................................................................................................................................................. 1 1.3 Limitations ..................................................................................................................................................................... 1 2.0 SITE INFORMATION ...................................................................................................................................2 2.1 General .......................................................................................................................................................................... 2 2.2 Site Description ............................................................................................................................................................. 3 3.0 HISTORICAL LAND USE ...............................................................................................................................4 4.0 ENVIRONMENTAL SETTING ........................................................................................................................5 4.1 Geology, Mining, Ground Stability and Ground Workings ........................................................................................... 5 4.1.1 Geology ................................................................................................................................................................. 5 4.1.2 Coal Mining ........................................................................................................................................................... 5 4.1.3 Non-coal Mining and Natural Cavities .................................................................................................................. 5 4.1.4 Ground Stability .................................................................................................................................................... 6 4.1.5 Ground Workings .......................................................................................................................................................... 6 4.2 Radon ............................................................................................................................................................................ 6 4.3 Hydrogeology, Hydrology, Flood Risk and Drainage Issues ......................................................................................... 6 4.3.1 Hydrogeology ........................................................................................................................................................ 6 4.4 Hydrology and Flood Risk.............................................................................................................................................. 6 5.0 PREVIOUS INVESTIGATIONS .......................................................................................................................8 6.0 SITE INVESTIGATION ..................................................................................................................................9 6.1 Proposed Development ................................................................................................................................................ 9 6.2 Scope of Investigation ................................................................................................................................................... 9 6.3 In-Situ Testing ................................................................................................................................................................ 9 6.4 Geotechnical Laboratory Testing .................................................................................................................................. 9 6.5 Chemical Laboratory Testing ...................................................................................................................................... 10 6.6 Gas Monitoring ........................................................................................................................................................... 10 6.7 Limitations ................................................................................................................................................................... 10 7.0 GROUND CONDITIONS ............................................................................................................................. 11 7.1 Made Ground .............................................................................................................................................................. 11 7.2 Topsoil ......................................................................................................................................................................... 11 7.3 Superficial Deposits ..................................................................................................................................................... 11 7.4 Solid Deposits .............................................................................................................................................................. 11 7.5 Groundwater ............................................................................................................................................................... 11 7.6 Ground Obstructions .................................................................................................................................................. 11 7.7 Observed Contamination ............................................................................................................................................ 11 7.8 In-Situ and Laboratory Geotechnical Analysis ............................................................................................................ 11 8.0 GROUND CONTAMINATION ASSESSMENT ................................................................................................ 13 Springwell Village - Sunderland i Issue V5 Ground Investigation Interpretive Report March 2021 8.1 Legislation ................................................................................................................................................................... 13 8.2 Assessment Methodology .......................................................................................................................................... 13 8.3 Derivation of Soils TSVs ............................................................................................................................................... 14 8.4 Soil Contamination Assessment ................................................................................................................................. 14 8.4.1 Soils Statistical Assessment ......................................................................................................................................... 14 8.5 Leachate Contamination Assessment ........................................................................................................................ 14 8.6 Groundwater Contamination Assessment ................................................................................................................. 14 9.0 GROUND GAS ..........................................................................................................................................15 9.1 Gas Monitoring ........................................................................................................................................................... 15 9.2 Gas Risk Assessment ................................................................................................................................................... 15 9.3 Gas Protection Measures ............................................................................................................................................ 16 9.4 Discussion .................................................................................................................................................................... 16 10.0 ENVIRONMENTAL RISK ASSESSMENT ....................................................................................................... 18 10.1 Contamination Sources ..............................................................................................................................................