Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE DATE: 08/01/2020
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REPORT NUMBER: 4489,DS,DESK/AT,TP/08-01-20/V1 SITE: Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE DATE: 08/01/2020 Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE DOCUMENT CONTROL SHEET Report Number: 4489,DS,DESK/AT,TP/08-01-20/V1 Client: Murfet Group Project Name: Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE Project Number: 4489,DS Report Type: Phase 1 – Desk Study and Preliminary Risk Assessment Status Final Date of Issue: 08 January 2020 Issued By: Geosphere Environmental Ltd, Brightwell Barns, Ipswich Road, Brightwell, Suffolk, IP10 0BJ. T: 01603 298 076 / 01473 353 519. W: www.geosphere-environmental.co.uk Confidentiality, Copyright and Reproduction: This document has been prepared by Geosphere Environmental Ltd in connection with a contract to supply goods and/or services and is submitted only on the basis of strict confidentiality. The contents must not be disclosed to third parties other than in accordance with the terms of the contract. Geosphere Environmental Ltd accepts no responsibility whatsoever to third parties to whom this report, or any part thereof, is made known. Any such party relies upon the report at their own risk. Prepared By: Reviewed By: Authorised By: Ashleigh Thorneycroft Tom Powling Paul Davies Environmental Consultant Director Director VERSION RECORD Version Version Version Version Version V22 / DST17 / 21-05-19 Page 1 4489,DS,DESK/AT,TP/08-01-20/V1 Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE EXECUTIVE SUMMARY Site Location / Geosphere Environmental Ltd was commissioned by the Client, Murfet Group, Description to undertake a Phase 1 Desk Study and Preliminary Risk Assessment for a proposed residential development at Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE. At the time of the walkover survey, the site comprised an irregular-shaped parcel of land, and occupied an approximate area of 0.65 hectares (ha). The site was situated on the northern edge of Tawney Lane. On a broader perspective, it comprised a single dwelling and a number of barns / stables to the west and south, and rough vegetated land to the east and west. History The earliest available historical map, dated 1872 to 1874, indicated the site to comprise undeveloped land, with a single structure straddling the eastern site boundary. By 1971, this structure was no longer evident, and the present-day Cutlers Forge Cottage was apparent in the southwest. Between the 1970s and mid-1980s, a handful of buildings were constructed towards the southwest, south, and centre of the site. Aerial imagery indicates soil movement may have taken place onsite in the 2000s. In the wider surrounding area, generally minor developments took place to the west and south of the site during the 20th century. A Smithy was indicated 5m southwest of the site until sometime between 1920 and 1971. Two ponds are indicated to have been infilled, as well as two former pit locations. Conceptual Model Based upon the findings of the preliminary risk assessment, a number of potential contaminant sources and pathways to potential receptors may exist at the site, namely Made Ground, area of burning, infilled pits and infilled ponds. A preliminary intrusive investigation including ground gas monitoring is recommended at the site to further assess the identified potential risks. Conclusions and The following works are recommended: Recommendations • A targeted ground investigation should be undertaken for soil quality assessment, including ground gas / groundwater level monitoring; • Should demolition of the buildings be considered it would be necessary to (a) fully update the building Asbestos Register, where present or (b) undertake a Refurbishment and Demolition (asbestos survey) of the buildings, in accordance with current guidance. This Executive Summary only provides a summary of the site data and its assessment. It does not provide a definitive engineering analysis and is for guidance only. It is recommended that the reader reviews the report in its entirety and any material referenced therein. V22 / DST17 / 21-05-19 Page 2 4489,DS,DESK/AT,TP/08-01-20/V1 Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE CONTENTS Page No. EXECUTIVE SUMMARY 2 1. INTRODUCTION 5 2. SITE SETTINGS 6 2.1 Site Description 6 2.2 Geological Setting 8 2.2.1 Superficial Deposits 8 2.2.2 Bedrock Geology 8 2.2.3 Geohazards and Ground Workings 8 2.3 Hydrogeological Setting 8 2.3.1 Underlying Aquifers 8 2.3.2 Groundwater Vulnerability 9 2.4 Hydrological Setting 9 2.5 Radon 9 2.6 Nitrate Vulnerable Zone 9 3. ENVIRONMENTAL SEARCHES 10 3.1 Environmental Searches Summary 10 3.2 Local Authority Information 10 4. SITE HISTORY 12 4.1 Historical Maps 12 5. CONCEPTUAL MODEL 14 5.1 Hazard Identification: Onsite 14 5.2 Hazard Identification: Offsite 15 5.3 Hazard Assessment 15 6. CONCLUSIONS AND RECOMMENDATIONS 17 APPENDICES 18 APPENDIX 1 – REPORT LIMITATIONS AND CONDITIONS 19 APPENDIX 2 – REFERENCES 21 APPENDIX 3 – ENVIROCHECK DATA SEARCH REPORT 22 APPENDIX 4 – ENVIROCHECK HISTORICAL MAPS 23 APPENDIX 5 – COMPARISON OF CONSEQUENCES AGAINST PROBABILITY 24 APPENDIX 6 - DRAWINGS 25 APPENDIX 7 - PHOTOGRAPHS 26 APPENDIX 8 - LOCAL AUTHORITY (EPPING FOREST DISTRICT COUNCIL) CORRESPONDENCE V22 / DST17 / 21-05-19 Page 3 4489,DS,DESK/AT,TP/08-01-20/V1 Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE CONTENTS TABLES Page No. Table 1 – Geohazards and Ground Workings 8 Table 2 - Environmental Searches Summary 10 Table 3 - Historical Summary 12 Table 4 – Conceptual Model 16 V22 / DST17 / 21-05-19 Page 4 4489,DS,DESK/AT,TP/08-01-20/V1 Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE 1. INTRODUCTION Geosphere Environmental Ltd was commissioned by the Client, Murfet Group, to undertake a Phase 1 Desk Study and Preliminary Risk Assessment for a proposed residential development at Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE. It was understood that the site is to be developed into four residential properties with associated gardens and hardstanding. The primary objectives of the preliminary risk assessment were to: • Assess environmental sensitivity at the site and the surrounding area in relation to any suspected or known contamination which may significantly affect the site and the proposed development; and • Indicate whether further works are required, and the nature of the works, to enable a more complete assessment of the site. These were achieved by: • Undertaking a walkover of the site; • Researching and assessing the available information regarding the current site status, including recorded geology, hydrogeology and hydrology of the site and surrounding area, as well as the history of the site; and • Developing a Conceptual Site Model. A Proposed Development Plan, Drawing ref. CWEF/18/01, is provided within Appendix 6. Other associated documents and details can be found on the Epping Forest District Council planning portal under planning reference: EPF/2147/18. V22 / DST17 / 21-05-19 Page 5 4489,DS,DESK/AT,TP/08-01-20/V1 Cutlers Forge Cottage, Tawney Lane, Stapleford Tawney, RM4 1EE 2. SITE SETTINGS 2.1 Site Description The subject site was situated in the village of Stapleford Tawney. Essex, approximately 500m to the west of Sutton’s Manor Hospital. The site may be located by National Grid Reference (NGR) 550660 197850 and is shown on the Site Location Plan Drawing ref. 4489,DS/001/Rev0, provided within Appendix 3. A site walkover was undertaken by a Geoenvironmental Consultant on the 04 December 2019 after detailed discussion with the client regarding the previous history of the site. A Site Plan, Drawing ref. 4489,DS/002/Rev0, is provided within Appendix 3 and should be reviewed in conjunction with this section of the report. At the time of the walkover survey, the site comprised an irregular-shaped parcel of land, and occupied an approximate area of 0.65 hectares (ha). The site was situated on the northern edge of Tawney Lane. On a broader perspective, it comprised a single dwelling and a number of barns / stables to the west and south, and rough vegetated land to the east and west. For ease of reference, the building structures onsite have been split into three groups (A to C). The groups are denoted on the Site Plan, Drawing ref. 4489,DS/002/Rev0 within Appendix 3, and are described below. Group A, located in the southwest corner, was largely separated from the rest of the site by wooden fencing, and was accessible via a gated hardstanding driveway. It contained a single-storey L-shaped brick dwelling, ‘Culters Forge Cottage’, and an L-shaped wooden barn, which adjoined the north of Cutlers Forge Cottage. The internal cottage and barn were inaccessible during the site visit however, it was understood from existing site plans that the barn was utilised for tractor storage and shall be assessed as such. A small hardstanding courtyard located centrally between the barn and the cottage however, this was inaccessible at the time of the site visit and an aerial imagery review indicated general storage associated with residential usage. A hardstanding driveway adjoined the eastern facet of the dwelling and barn. Immediately north of the tractor barn was an area of concrete hardstanding and brick wall remnants. Plans of the site indicate it to have formerly comprised a ‘hay barn’ prior to being demolished. The remainder and bulk of the site was accessible via a gated gravelled driveway, located east of the gate to Cutlers Forge Cottage. From the site entrance, a gravelled track extended to the north and east, adjoining several barn-type structures and stables. Group B, located in the south of the site, comprised an open-faced wooden barn structure. It was generally in a poor state of repair, and as we understand it was historically used as stables.