Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF Oak Mill Stud Toothill Epping Essex, CM5 9SF PHASE I – Contaminated Land Assessment SUFFOLK: Registered Office: 7 Museum Street Ipswich Suffolk IP1 1HQ T 01473 280699 F 01473 280701 E [email protected] (Registered No: 4806356) ESSEX: 8 Atlantic Square Station Road Witham Essex CM8 2TL T 01376 503020 E [email protected] NORFOLK: 23 St Stephens Road Norwich Norfolk NR1 3SP T 01603 619093 F 01603 619840 E [email protected] Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF DOCUMENT CONTROL Report prepared by: Report reviewed by: A J Cartwright BSc(Hons) Hannah Purkis BSc (Hons) GradCIWEM On behalf of JPC Environmental Services On behalf of JPC Environmental Services A Division of JP Chick & Partners Limited A Division of JP Chick & Partners Limited JPC Issuing Office 7 Museum Street, Ipswich, IP1 1HQ ISSUE & REVISIONS RECORD Document No Issue Date Comments Format Issued CE20/001/CP1 Tuesday, 07 Issued to Miss A. Carol Email July 2020 c/o Shaw & Jagger Architects Ltd ☐ Disk ☐ Digital Upload ☐ Post Document Issue Date Document Revision Revised Reviewed Format Issued Revision No Comments by (INT) by (INT) CE20/001/CP2 Monday, 20 Revised to include local AJC HP Email July 2020 authority comments ☐ Disk ☐ Digital Upload ☐ Post Phase I Contaminated Land Assessment Report – Produced by J P Chick & Partners Ltd For: Miss A. Carol Our Reference: CE20/001 Date: 20/07/2020 Page 1 Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF Table of Contents DOCUMENT CONTROL ISSUE & REVISIONS RECORD EXECUTIVE SUMMARY 1.0 INTRODUCTION 1.01 Brief 1.02 Scope 1.03 Location 1.04 Development Proposal 2.0 DESK STUDY 2.01 Sources of Information 2.02 Site Description (Walkover Survey) 2.03 Site History 2.04 Geology, Hydrogeology & Hydrology 2.05 Statutory Searches - Enviro Insight Report 2.06 Radon 2.07 Mineral Workings & Potentially Infilled Land 2.08 Local Authority 2.09 Planning Portal 3.0 CONCEPTUAL SITE MODEL 3.01 Introduction 3.02 Identified Potential Sources of Contamination 3.03 Identified Potential Pathways of Contamination 3.04 Identified Potential Receptors of Contamination 3.05 Plausible Pollutant Linkages 4.0 ENVIRONMENTAL ASSESSMENT 4.01 Summary of Key Drivers 4.02 Environmental Risk Assessment 4.03 Environmental Litigation (Part IIA) 4.04 Further Investigations 5.0 RECOMMENDATIONS Phase I Contaminated Land Assessment Report – Produced by J P Chick & Partners Ltd For: Miss A. Carol Our Reference: CE20/001 Date: 20/07/2020 Page 2 Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF Figures Figure 1 Proposed Site Plan (extract) Figure 2 Historic Map (1873-1874, extract) Tables Table 1 Historic Mapping Table 2 BGS Borehole Log Table 3 Potential Contaminant Sources Table 4 Potential Contaminant Pathways Table 5 Potential Contaminant Receptors Table 6 Identified Potential Sources Table 7 Identified Potential Pathways Table 8 Identified Potential Receptors Table 9 Initial Conceptual Site Model Table 10 Risk Classification Appendices Appendix A Site Location Plan Appendix B Architect’s Layout Plan Appendix C Site Photographs Appendix D Historic Maps Appendix E Enviro Insight Report Appendix F Local Authority Response Phase I Contaminated Land Assessment Report – Produced by J P Chick & Partners Ltd For: Miss A. Carol Our Reference: CE20/001 Date: 20/07/2020 Page 3 Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF EXECUTIVE SUMMARY Site Name & Address: Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF Client: Miss A. Carol Architect: Shaw & Jagger Architects Ltd Local Planning Authority: Epping Forest District Council Historical Site Use: Agricultural fields Present Site Use: Equestrian facilities, including stables and ménage Proposed Site Use: Single Residential Property Date of most recent investigation: Friday, 03 July 2020 - Site walkover survey Objectives: ▪ To develop a good understanding of the site’s history and environmental context; ▪ To determine the potential existence of any significant pollutant linkages which might represent a potential risk to construction workers, future occupants of the site or controlled waters; ▪ To undertake a Tier 1 ‘Contaminated Land’ investigation in accordance with CLR11 and guidance contained in the NHBC Publication 66: 2008. Geology, Hydrogeology & Hydrology: ▪ Based on the BGS online mapping, the site is likely to be underlain by a combination of superficial deposits comprising Sand and Gravel of the Stanmore Gravel Formation to the west and Lowestoft Formation – Diamicton to the east. The bedrock deposits beneath comprise Claygate Member – Clay, Silt & Sand. ▪ The BGS borehole [TL50SW78] log records Boulder Clay (Blue marl, overlaying White marl) to 9.14m bgl, underlain by Gravel, overlaying London Clay to 12.2m bgl. ▪ With reference to the groundwater mapping presented on the DEFRA website, the site is located between two different superficial aquifer designations. The deposits to the west are classified as Secondary A (permeable layers supporting water supplies locally) while the deposits to the east are classified as Secondary Undifferentiated (formerly classified as minor/non-aquifer). The bedrock aquifer is designated as Secondary A. ▪ In terms of groundwater vulnerability, the site is classified as Medium-High risk on DEFRA’s Magic Map website. ▪ The site is not located within a Source Protection Zone. ▪ The site is located within Flood Zone 1. ▪ In relation to the overall hydrology, the site is mostly permeable and laid to managed grass with the only exception being the footprint of the stable block and field shelters. Historical activities on and surrounding the site may have resulted in a degree of made ground, which could affect the overall hydrology at the site. Findings: ▪ The site appears to have formed a part of an agricultural field until the early 2000s, when a single building was recorded. The building was then extended by 2010 into its current configuration. ▪ Our historic map review has identified an infilled pond located approximately 20m remote from the site. Phase I Contaminated Land Assessment Report – Produced by J P Chick & Partners Ltd For: Miss A. Carol Our Reference: CE20/001 Date: 20/07/2020 Page 4 Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF Risk Assessment: ▪ Our desk-based research and walkover survey identified the following potential sources of contamination: i) On-site; Current/ Recent Site Use (Stables and Ménage, including limited fuel storage). ii) Off-site; Infilled pond, historic windmill, licensed discharge, recent industry. ▪ We consider that the above sources represent a LOW risk to the site and future site users. ▪ We consider the potential on-site sources of contamination to represent a LOW risk to groundwater. ▪ The potential risk from ground gas migrating onto the site, and affecting the proposed development, is considered to be LOW. Recommendations: Based on the information obtained and reviewed as part of this preliminary assessment, JPC Environmental Services would advise the following: • Based on the low risk nature of the site, we do not consider it necessary to undertake a Phase II intrusive investigation on this occasion. • We would, however, advocate the adoption of a ‘Discovery Strategy’. If any suspicious or malodorous soils are encountered during ground works, then work will need to be stopped until samples of the soil can be tested for a typical range of environmental contaminants. Phase I Contaminated Land Assessment Report – Produced by J P Chick & Partners Ltd For: Miss A. Carol Our Reference: CE20/001 Date: 20/07/2020 Page 5 Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF 1.0 INTRODUCTION 1.01 Brief 1.01.1 JPC Environmental Services were appointed by Shaw & Jagger Architects Ltd, on behalf our mutual client Miss A. Carol, to undertake a Phase I Contaminated Land Investigation and Risk Assessment for ‘Oak Mill Stud, Toothill, Epping, Essex, CM5 9SF ’ (hereafter referred to as ‘the site’). 1.01.2 The purpose of the investigation, comprising a desktop study and walkover survey was to: ▪ Identify any significant potential sources of ground contamination either on the site or in close proximity to it, which could have a negative impact on the proposed development. ▪ To determine the potential existence of any significant pollutant linkages that might represent a potential risk to future occupants. ▪ To determine whether any further investigations would be required, to enable the potential risk to human health and controlled waters to be assessed. 1.01.3 The investigation was carried out broadly in accordance with Contaminated Land Report 11 (CLR 11) and the updated NHBC Guidance Document “R & D Publication 66: 2008 – Guidance for the Safe Development of Housing on Land Affected by Contamination”. 1.01.4 Authority to carry out this work was received on 29 June 2020 from Shaw & Jagger Architects Ltd, via email. 1.01.5 This report shall be for the private and confidential use of Miss A. Carol, for whom it was undertaken. It should not be reproduced in whole or in part, or relied upon by a third party for any use without the express written authority of JPC Environmental Services. 1.01.6 In producing this report, we have exercised all the reasonable skill, care and diligence to be expected of an appropriately qualified and competent consultant, experienced in carrying out equivalent services for developments of a similar size, scope and complexity, value and purpose to the development. 1.02 Scope 1.02.1 The main elements of the investigation were as follows: ▪ The collection and review of historical and