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SMITHFIELD LLANIDLOES Geo-Environmental and Geotechnical Assessment Report

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SMITHFIELD LLANIDLOES Geo-Environmental and Geotechnical Assessment Report SMITHFIELD LLANIDLOES Geo-Environmental and Geotechnical Assessment Report JUNE 2019 CONTACTS FIONA WALDRON Senior Geo-Environmental Consultant m +44 (0) 7595 096771 Arcadis. e [email protected] Level 1 2 Glass Wharf Temple Quay Bristol BS2 0FR Arcadis (UK) Limited is a private limited company registered in England registration number: 1093549. Registered office, Arcadis House, 34 York Way, London, N1 9AB. Part of the Arcadis Group of Companies along with other entities in the UK. Regulated by RICS. Copyright © 2015 Arcadis. All rights reserved. arcadis.com Smithfield Llanidloes Geo-Environmental and Geotechnical Assessment Report Author Fiona Waldron Checker Gemma Francis Approver Tony Windsor Report No 0002-10010344-28-SER-M-02 Date JUNE 2019 VERSION CONTROL Version Date Author Changes 01 30th April 2018 FW Rev 01 for issue 02 27th June 2019 GF Alterations to reflect additional ground gas monitoring This report dated 27 June 2019 has been prepared for Powys County Council (the “Client”) in accordance with the terms and conditions of appointment dated 14 December 2017 (the “Appointment”) between the Client and Arcadis Consulting (UK) Ltd (“Arcadis”) for the purposes specified in the Appointment. For avoidance of doubt, no other person(s) may use or rely upon this report or its contents, and Arcadis accepts no responsibility for any such use or reliance thereon by any other third party. CONTENTS 1 INTRODUCTION ....................................................................................................... 1 Terms of Reference .............................................................................................................................. 1 Proposed Development ........................................................................................................................ 1 Previous Reports .................................................................................................................................. 1 Report Objectives ................................................................................................................................. 1 Limitations ............................................................................................................................................. 1 2 SITE SETTING AND PRELIMINARY CONCEPTUAL SITE MODEL ....................... 2 Site Location and Description ............................................................................................................. 2 Environmental Setting .......................................................................................................................... 3 2.2.1 Geology, hydrology and hydrogeology ............................................................................................... 3 2.2.2 Site History.......................................................................................................................................... 3 2.2.3 Potentially Contaminative Land Uses ................................................................................................. 4 2.2.4 Radon ................................................................................................................................................. 4 2.2.5 Ecological Designated Sites ............................................................................................................... 4 2.2.6 Archaeological sites and ancient monuments .................................................................................... 4 Preliminary Conceptual Site Model .................................................................................................... 4 3 PRELIMINARY SITE INVESTIGATION .................................................................... 7 General................................................................................................................................................... 7 Exploratory Holes ................................................................................................................................. 7 3.2.1 Exploratory Hole Locations ................................................................................................................. 7 3.2.2 Investigation Methodology .................................................................................................................. 7 3.2.3 Cable Percussive Boring .................................................................................................................... 8 3.2.4 Dynamic Sampling .............................................................................................................................. 8 In situ Testing ....................................................................................................................................... 9 3.3.1 Standard Penetration Testing ............................................................................................................. 9 Installations and Post-Fieldwork Monitoring ..................................................................................... 9 3.4.1 Installations ......................................................................................................................................... 9 3.4.2 Post-fieldwork Monitoring ................................................................................................................. 10 4 LABORATORY TESTING ....................................................................................... 11 General................................................................................................................................................. 11 Geotechnical Laboratory Testing ..................................................................................................... 11 Geo-Environmental Laboratory Testing ........................................................................................... 11 5 GROUND CONDITIONS .......................................................................................... 13 Introduction ......................................................................................................................................... 13 Groundwater ....................................................................................................................................... 14 Visual and Olfactory Evidence of Contamination ........................................................................... 14 Geotechnical Parameters................................................................................................................... 14 5.4.1 Standard Penetration Test (SPT) Results ........................................................................................ 16 5.4.2 Particle Size Distribution (PSD) Sieve Test Results ......................................................................... 16 5.4.3 Atterberg Results .............................................................................................................................. 17 5.4.4 BRE SD1 Testing Results ................................................................................................................. 17 6 GEO-ENVIRONMENTAL ASSESSMENT ............................................................... 18 Soil Screening Values (SSVs) ........................................................................................................... 18 Tier 1 Screening Assessment ........................................................................................................... 18 6.2.1 Asbestos ........................................................................................................................................... 18 6.2.2 Exceedances of SSVs in Made Ground Samples ............................................................................ 18 6.2.3 Exceedances of SSVs in natural soil samples ................................................................................. 19 6.2.4 Vapour .............................................................................................................................................. 19 Controlled Waters Risk Assessment ................................................................................................ 19 6.3.1 Water Quality Standards ................................................................................................................... 19 6.3.2 Screening Assessment ..................................................................................................................... 20 6.3.3 Metals ............................................................................................................................................... 20 6.3.4 Hydrocarbons in Made Ground ........................................................................................................ 20 Ground Gas Risk Assessment .......................................................................................................... 21 6.4.1 Gas monitoring methodology ............................................................................................................ 21 Atmospheric Pressure ....................................................................................................................... 21 Gas Monitoring Results ..................................................................................................................... 21 Discussion of Gas Data .....................................................................................................................
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