Hannah Reed and Associates Ltd Were Commissioned by Faccenda Property Ltd to Conduct a Land Contamination Preliminary Risk Assessment
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Hannah Reed FACCENDA GROUP LTD CHICKEN FACTORY SITE HIGH STREET SUTTON BENGER LAND CONTAMINATION PRELIMINARY RISK ASSESSMENT REPORT Faccenda Property Ltd Willow Road Brackley Northamptonshire NN13 7EX Hannah, Reed and Associates Limited Marlborough House High Street Kidlington COPYRIGHT OX5 2DN THIS DOCUMENT MUST NOT BE COPIED OR REPRODUCED WITHOUT THE PRIOR PERMISSION OF HANNAH, REED AND ASSOCIATES LIMITED Tel No. 01865 841893 X-210030/EGS/SH/DKP/June 2011 Revision: A 1 Faccenda Group Ltd Chicken Factory Land Contamination Preliminary Risk Assessment High Street, Sutton Benger Revision A ______________________________________________________________________________ CONTENTS PAGE NO. EXECUTIVE SUMMARY 3 1 INTRODUCTION 5 2 OBJECTIVES 6 3 SITE SETTING AND SOURCES OF DESK STUDY INFORMATION 7 4 SITE RECONNAISANCE 10 5 CONCEPTUAL SITE MODEL 12 6 ASSESSMENT OF LAND POLLUTION POTENTIAL 15 7 CONCLUSIONS AND RECOMMENDATIONS 19 APPENDICES A Site Location Plans, Environment Agency Aquifer Maps, Wessex Water Asset Location Plans B Existing and Proposed Development Plans C Landmark Envirocheck Report Data D Site Reconnaissance Photos E Existing Site Drainage and Potential Pollution Source Locations F Extract from DoE Industry Profile G Conceptual Site Model X210030/SH/May 2011 2 Hannah-Reed Faccenda Group Ltd Chicken Factory Land Contamination Preliminary Risk Assessment High Street, Sutton Benger Revision A ______________________________________________________________________________ EXECUTIVE SUMMARY Hannah Reed and Associates Ltd were commissioned by Faccenda Property Ltd to conduct a Land Contamination Preliminary Risk Assessment. The site is located in the centre of the village of Sutton Benger, adjacent to the High Street. Sutton Benger is located in Wiltshire, approximately 1km South of the M4, between Chippenham and Swindon. The site is bound by the Sutton Benger Brook to the North, and houses to East, South and West. The site has historically been used for the slaughter and processing of chickens to produce food product for human consumption. The nature and storage of oils and chemicals associated with this activity could present a risk of contamination to the site. The site comprises a large 10,000m2 chicken factory building in the centre of the site, which is surrounded by five smaller associate buildings. An effluent treatment plant serving the site was located in the Northern area of the site. The site also comprises an access road, car parking, lorry parking and hardstanding storage areas. The proposed development comprises the demolition of an existing chicken factory and associated buildings to enable the construction of 63 new residential dwellings and the construction of approximately 0.170ha (1700m2) employment related development and associated car parking facilities and infrastructure. There will also be local landscaped communal park and play areas. The objective of the preliminary risk assessment is to develop an outline conceptual model and establish whether there are any potentially unacceptable risks arising from contamination at the site. A site reconnaissance was undertaken on 18th May 2011 by Hannah Reed and Associates Ltd, as part of the assessment, to inspect the site and surrounding area for indicators of potential land and water contamination. The Landmark Information Group was requested to provide records of any Discharge Consents, Waste Management Licences, Environmental Permits, Abstraction Licences, IPC Authorisations, PPC Permits and Land Drainage Consents for the site, and within 500m of the site boundary. There are five Discharge Consents within 1000m of the site, one of which is located on site and was granted in 1984 to the Faccenda Group Ltd chicken factory. There is one Local Authority Pollution Prevention and Control Permit within 500m of the site. A permit was granted to the Faccenda Group Ltd chicken factory for animal slaughter and associated waste disposal. There are seven water abstraction notices within 1000m of the site, including three boreholes on site, granted to the Faccenda Group Ltd chicken factory. A historical landfill site is located 275m to the North of the site, near Seagry Road. The site was used for depositing waste, including inert, commercial and household waste. This area is still used as a licensed waste management facility for non-biodegradable waste. The Landmark Information Group was requested to provide details of any Nature Conservation Designations for the site and within 500m of the site boundary. The site is in a Nitrate Vulnerable Zone. The Landmark Information Group was requested to provide records of any pollution incidents associated with the site and within 1000m of the site boundary. One incident occurred on the site. A breakdown of pumps, due to inconsistent repairs, allowed poultry waste into the watercourse. The historical land use map shows potentially contaminative industrial uses from both the quarrying and chicken factory activities historically located at the site. Other sites with potentially contaminative industrial uses are the sewage works South-East of the site and the landfill site North of the site. X210030/SH/May 2011 3 Hannah-Reed Faccenda Group Ltd Chicken Factory Land Contamination Preliminary Risk Assessment High Street, Sutton Benger Revision A ______________________________________________________________________________ The British Geological Survey Map indicates that the site is underlain by First Terrace River Gravels, which are underlain by Kellaways Sand Member, which is silicate sandstone and silicate siltstone, with interbeds of sandy and silty mudstone. The surface water features in the vicinity of the site include the Sutton Benger Brook and the River Avon. From the site reconnaissance, it appears that chemical and oil storage tanks were located in designated bunds and buildings to prevent spills from seeping into the ground. Oil interceptors were located at the site’s surface water outflow points to prevent any contaminative discharge to the watercourse via the surface water drainage system. The findings of the desk study and site reconnaissance were used to develop a CSM for the site. A graphical representation of the CSM was been produced in the form of a section through the site, taken from South to North. The CSM uses the Source – Pathway – Receptor Model, which can be applied to the site as: Sources - potential leaks or spills of effluent, chemicals and oils. Pathways – vegetation, surface waters, soil and groundwater at the site. Receptors – The Sutton Benger Brook, Groundwater and Aquifers, Abstracted Groundwater Consumers, construction workers, future residents, office workers and general end users. With regards to the storage and use of oils, chemicals and effluent treatment the Source – Pathway – Receptor chain is likely to have been broken due to the presence of mitigation techniques such as designated storage hardstandings, buildings, bunds and interceptors, which should have prevented potential sources reaching the receptors via the drainage and soil pathways. However, it could have been possible for accidental spills and overflows to cause minor spot location contamination. The record of an incident of pollution at the site could suggest that contamination may have occurred. There appears to be a medium risk of land and controlled water contamination due to accidental spills and leaks of effluent, solvents, sulphur dioxide, potassium nitrate, sodium nitrate, sodium nitrite bleach and disinfectants and fuel oils, which may have bypassed or exceeded the mitigation techniques implemented at the site. Any potential contamination is likely to be located at the storage or use areas for each of these substances or near the interceptors. Consequently, further analysis of the potential soil and groundwater contamination should be carried out during a Phase 2 intrusive site investigation, at the design stage of the project, which should incorporate a geo-environmental investigation in accordance with British Standard 10175:2000 – Investigation of potentially contaminated sites Code of Practice. The geo-environmental investigation should focus on the potential source contaminants, pathways and receptors identified in this Preliminary Risk Assessment. Any contamination present is likely to be localized and limited to the materials’ immediate use and identified storage areas. Localized contamination can be disposed of to a suitable landfill site and replaced with clean fill. The geotechnical and geo-environmental intrusive site investigation report should identify suitable remediation options if required. The results of the Phase 2 investigation, and the remediation strategy if required, should be submitted in writing to the Local Planning Authority for approval. X210030/SH/May 2011 4 Hannah-Reed Faccenda Group Ltd Chicken Factory Land Contamination Preliminary Risk Assessment High Street, Sutton Benger Revision A ______________________________________________________________________________ INTRODUCTION Hannah Reed and Associates Ltd were commissioned by Faccenda Property Ltd to conduct a Land Contamination Preliminary Risk Assessment. 1.1 Site Location The site is located in the centre of the village of Sutton Benger, adjacent to the High Street. Sutton Benger is located in Wiltshire, approximately 1km South of the M4, between Chippenham and Swindon. The centre of the site is approximately National Grid Reference 394520m Easting and 178780m Northing. The site covers an area of approximately 3.90ha and can be