THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY NON-TECHNICAL SUMMARY SUMMARY Site 35 Moat Lane, in Slade Green, Kent, DA8 2ND It is understood that proposals involve the clearance of the site and construction of a Proposed residential development. The proposed development will comprise nine apartments with Development communal open space, access roads, private gardens and soft verges. Current Use Sports club /bar and five-a-side football pitch. On-site: From the earliest mapping record dated 1895, the site is present as open ground. No changes are shown until 1938 whereupon the site is labelled as Allotment Gardens. By 1961, a fence is present on site orientated north / south in the centre of the site. The currently present sports club building is first shown on the 1972 mapping record. By at least 2000, the club building had been extended to the north and occupies circa 50% of the site at this time (western half). The eastern half of the site is shown as a five-a-side Site History football pitch. No further changes are noted on mapping records. Off-site: From 1938, the area of land immediately to the north of the site appears to have been reduced in level, likely caused by shallow excavation of superficial deposits. Whilst excavation does not appear to have encroached onto the subject site, the embankment created by the excavation is present immediately north of the site. It is also noted that by 1938 the excavation activities had already ceased with the former quarry area labelled as a Sports Ground with a pavilion. The subject site is listed as a historical landfill – historical landfills can represent sources of significant contamination depending on the nature of the wastes deposited and give rise to soil and groundwater contamination, as well as the generation of landfill gases such as methane and carbon dioxide. However, from a review of historical mapping Key Sources of records, gravel and sand extraction occurred immediately north of the site (rather than on Potential site) and it is likely that the landfill licence was granted to the former quarry to allow the Contamination deposition of reject sands etc for landscaping. Whilst this may have included imported wastes of unknown origin, site investigations undertaken in 2017 by MLM (largely off- site), do not indicate the deposition of household or industrial waste. Importantly the borehole advanced on site only identified a very limited thickness (0.4m) of Made Ground over superficial deposits. Historical mapping records show that the site has undergone periods of possible earthworks. BGS mapping records show the site to be underlain by superficial Taplow Geology, Gravel (Secondary A aquifer), over Lewes Nodular Chalk Formation (Principal aquifer). Hydrogeology and The site does not lie within a groundwater SPZ and there are no groundwater Hydrology abstractions within the local area. The nearest surface water feature is located 228m east and relates to a lake. This Phase 1 Desk Study has determined that there is a potential for contamination to be present on site in a circumstance which could lead to risks to identified receptors. On the basis of the 2017 MLM findings, whilst the risk associated with the landfill designation requires further investigation, the case for a significant risk is considered lessened. The following risks have been determined associated with the potential Land Quality contamination from the shallow ground workings and possible landfilled materials: Conclusions and • Moderate risk to future residents and site visitors, Recommendations • Moderate risk to groundwater within the Taplow Gravel (Secondary A aquifer) / Lewes Nodular Chalk Formation (Principal aquifer), • Moderate/ low risk to flora, • Moderate/ low risk to buried services and below ground structures and foundations, and © Copyright Lustre Consulting Limited The contents of this document must not be copied or reproduced in whole or part without the written consent of Lustre Consulting. THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY SUMMARY • Moderate risk to buildings and site occupants (associated with ground gases, possible NHBC Amber 2 classification). Risks from off-site landfills has been given a moderate risk rating to future site occupants and a moderate/ low risk to on-site groundwater. Based on the above risk ratings, further investigation is required to refine the risk assessment and validate the conceptual site model. A Phase 2 Site Investigation is therefore recommended which should determine: if the ground below the site has been subject to landfilling or significant reworking, the chemical condition of shallow soils and groundwater, and the ground gas regime. These works could be conditioned as part of a successful decision notice for the proposed development. A geotechnical investigation will be required to inform foundation design. Due to the presence of natural cavities within 1km of the site consideration should be given to Geotechnical obtaining a natural cavity occurrence database report and probability assessment for the Recommendations site to provide further information on the likely risk from identified ground hazards. Due to the presence of mining activities, further assessment of the risk from mining features and mine sites should be undertaken. © Copyright Lustre Consulting Limited The contents of this document must not be copied or reproduced in whole or part without the written consent of Lustre Consulting. THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY PROJECT RECORD PROJECT NAME THE SPORTSMAN - SLADE GREEN CLIENT SPORTSMAN ENTERPRISES REPORT DETAILS TYPE PHASE 1 DESK STUDY REFERENCE 3943 - 210414 - ML ISSUE DATE APRIL 2021 MATTHEW LARKIN AUTHOR BSc (Hons) MSc MCIWEM C.WEM CSci RSoBRA PRINCIPAL CLAIRE MUNNS REVIEWER BSc (Hons) MIEnvSc SENIOR CONSULTANT REGISTRATION OF AMENDMENTS REVISION REVISION REVISION DATE AMENDMENT DETAILS AUTHOR REVIEWER 2nd Floor North t 01634 757 705 The Fitted Rigging House e [email protected] The Historic Dockyard w lustreconsulting.com Chatham Kent, ME4 4TZ © Copyright Lustre Consulting Limited The contents of this document must not be copied or reproduced in whole or part without the written consent of Lustre Consulting. THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY CONTENTS 1.0 INTRODUCTION ......................................................................................................................... 6 2.0 LAND USE ................................................................................................................................. 11 3.0 SENSITIVITY & ANTHROPOLOGY .......................................................................................... 23 4.0 CONCLUSIONS & RECOMMENDATIONS .............................................................................. 30 RISK TABLE APPENDICES APPENDIX A: ENVIROCHECK REPORT APPENDIX B: HISTORICAL MAPS APPENDIX C: HISTORICAL BOREHOLE LOGS APPENDIX D: NOTES ON LIMITATIONS Lustre Consulting Limited Report Ref: 3943 - 210414 - ML Page No. 5 THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY 1.0 INTRODUCTION 1.1 This Phase 1 Desk Study has been prepared for the clearance and development of a site located at 35 Moat Lane, in Slade Green, Kent, DA8 2ND by Lustre Consulting Limited (Lustre) for Sportsman Enterprises (the Client). The assessment has been undertaken in accordance with our fee proposal dated 14/04/2021, which was formally approved by the Client on 16/04/2021. 1.2 The site, broadly square shaped in plan, is centered at National Grid Reference 552520, 176600, and occupies an approximate area of 0.14ha as shown in Figure 1. The site currently comprises a sports club/bar (The Sportsman Club) with an access road and a small hard surfaced football pitch, and is located within a residential land use area. The Client requires this Phase 1 Desk Study to support re-development works at the site. It is understood that proposals involve the clearance of the site and construction of a residential development. The proposed development will comprise a single apartment block with nine flats, along with communal open space, access roads, private gardens and soft verges. The area of parking and shared amenity space is at a lower elevation than the dwellings, by circa 1.5m. Figure 2 illustrates the proposed development scheme. Figure 1: Site Location Plan Lustre Consulting Limited Report Ref: 3943 - 210414 - ML Page No. 6 THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY Figure 2: Proposed Site Layout Objective 1.3 The objective of this Phase 1 Desk Study (also known as a Contaminated Land Assessment) is to determine the contaminative status of the site and to provide a general indication of the likely geoenvironmental issues which may be present on site or affect the site, as well as to provide guidance on any resultant liabilities. Information on likely geotechnical conditions and hazards is also to be assessed. Scope of Works 1.4 The scope of works for the desk study is summarised below: Lustre Consulting Limited Report Ref: 3943 - 210414 - ML Page No. 7 THE SPORTSMAN - SLADE GREEN PHASE 1 DESK STUDY • Review of available historical Ordnance Survey maps (dating back to the mid-1800s) of the site and surrounding areas to identify current or former potential sources of contamination both on-site and within the immediate surrounds; • Review of published geological, hydrogeological and hydrological records to assess the environmental setting of the site and surrounding areas; • Review of available public information