Rectory Farm | Detailed UXO Risk Assessment
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WE LISTEN, WE PLAN, WE DELIVER Geotechnical Engineering and Environmental Services across the UK. DETAILED PRELIMINARY UNEXPLODED ORDNANCE (UXO) RISK ASSESSMENT FOR THE SITE AT 34 – 38 Wallis Road, Hackney Wick, E9 5LH This report has been produced by Primely on behalf of JOMAS JOMAS ASSOCIATES LTD 6-9 The Square, Stockley Park, Uxbridge, UB11 1FW www.jomasassociates.com 0843-289-2187 [email protected] EXECUTIVE SUMMARY Site location and general description Primely Ltd has been commissioned by JOMAS ASSOCIATES Ltd to carry out a detailed Unexploded Ordnance (UXO) Risk Assessment for an investigation at a site located in Hackney, on the northern periphery of the London Borough of Hackney, located at 34-38 Wallis Road, Hackney Wick, London E9 5LH. It is bordered by Wallis Road to the north, Hepscott Road to the east, White Post Lane to the south and a multi-storey building fronting Rothbury Road to the west. The site is approximately centred on the OS grid reference TQ 36978 84509 as seen in figure 2.1 below. 34-38 Wallis Road is currently used for the open storage of skips. E15 2NE is currently in Coronavirus (Covid-19) National Lockdown Data from NHSX, correct as of 24th February 2021 Scope of proposed works It is understood that a series of site investigation works are planned across the site area. Risk assessment Primely Ltd has assessed that there is a LOW risk of items of unexploded German aerial delivered. Other types of munitions also constitute a LOW risk. ▪ The density of bombing was extremely high for the county borough of with 200- 299 items falling bombs per 1,000 acres. This statistic is a high average when compared with data from the UK as a whole and the rest of London bar the City of London itself. ▪ East London contained some major Luftwaffe targets which included: Hackney Wick Munitions Works, the Ford Motor Works, RAF Fairlop (situated 9km northeast of the site) the river Thames docks area (3km south), railway infrastructure and numerous industrial works and goods depots. ▪ The Civil Defence and London Bomb Census maps show numerous bombs strikes in the general area and inside the site boundary. Over two HE strikes are recorded in the bomb census mapping. ▪ Visual evidence suggests there is no sign of bomb cratering, debris or any sort of ruin; whilst the few structures present, such as the Greyhound Racing Stadium, are entirely intact. This would suggest the land has been purposely cleared or remediated although the basis of this is unknown. ▪ The levels of bombing in the area, amount of irregular open groundcover and the relative isolation of the location from surrounding built up areas can have a very real possibility that signs of UXO could have gone unnoticed throughout much of the early – mid WWII period. ▪ Sections of the site consist of areas of post-war fill as well as sections of wartime fill and natural geology. ▪ The Risk that UXO Remains on site several stages of post-war development has occurred inside the site area. ▪ Where development and post-war excavation has taken place, the risk of encountering shallow buried UXO (especially 1kg incendiaries or anti-personnel bombs), and anti-aircraft projectiles will have been partly mitigated. Recommended risk mitigation measures To support the proposed works, Primely Ltd suggests the following risk mitigation measures: • No further action. However, reactive measures should be employed such as a UXO “Toolbox” brief, a UXO ‘Emergency Management Plan’ and/or an “on-call” service. Primely Ltd can supply the above services 2 Table of Contents EXECUTIVE SUMMARY ............................................................................................................... 1 SITE LOCATION AND GENERAL DESCRIPTION ............................................................................................ 1 SCOPE OF PROPOSED WORKS .................................................................................................................... 1 RISK ASSESSMENT ...................................................................................................................................... 1 TABLE OF CONTENTS ................................................................................................................ 3 INTRODUCTION ........................................................................................................................... 7 1. METHODOLOGY ...................................................................................................................... 8 1.1 METHOD OBJECTIVES............................................................................................................................ 8 1.2 SOURCES OF INFORMATION ................................................................................................................. 9 2. SITE DETAILS AND DESCRIPTION ...................................................................................... 10 2.1 SITE LOCATION AND DESCRIPTION ..................................................................................................... 10 2.2 PROPOSED SCHEME OF WORK .................................................................................................... 10 2.3 GROUND CONDITIONS - GEOLOGY..................................................................................................... 11 2.4 HISTORICAL GROUND INVESTIGATION DATA ..................................................................................... 11 3. HISTORICAL DATASETS ....................................................................................................... 13 3.1 GENERAL ............................................................................................................................................. 13 3.2 SITE HISTORY ...................................................................................................................................... 13 3.3 ORDNANCE SURVEY HISTORICAL MAPS ............................................................................................ 16 3.4 SECOND WORLD WAR BOMBING STATISTICS ................................................................................... 17 3.5 AERIAL BOMBING ................................................................................................................................. 19 3.6 SOURCES OF POTENTIAL UNEXPLODED ORDNANCE ........................................................................ 19 3.6.1 Allied as source of UXO ........................................................................................................... 20 3.6.2 German as source of UXO ....................................................................................................... 20 3.7 WWII GERMAN AERIAL ORDNANCE TYPE DESCRIPTION HIGH EXPLOSIVE (HE) BOMBS .............. 21 3.7.1 German SC50 and SC250 ....................................................................................................... 21 3.7.2 1Kg Incendiary Bomb SD2 'Butterfly’ Bomb (Armed status) .............................................. 21 3.7.3 The Butterfly Bomb (or Sprengbombe Dickwandig 2 kg or SD2) ...................................... 22 3.7.4 V1s and V2s ............................................................................................................................... 22 3.8 CONSEQUENCES OF INTERACTION ..................................................................................................... 22 4. REQUIREMENT FOR UXO RISK ASSESSMENT .................................................................. 24 4.1 BACKGROUND ...................................................................................................................................... 24 4.2 CDM REGULATIONS 2015 .................................................................................................................. 24 4.3 OTHER LEGISLATIONS ......................................................................................................................... 25 5. DATA ANALYSIS.................................................................................................................... 26 6. RISK ASSESSMENT .............................................................................................................. 28 6.1 MAXIMUM BOMB PENETRATION DEPTH ............................................................................................. 28 6.1.1 The J-Curve Effect .................................................................................................................... 28 6.1.2 WWII UXB Penetration Studies ............................................................................................... 29 6.1.3 Site Specific Bomb Penetration Considerations ................................................................... 29 6.2 RISK PATHWAY .................................................................................................................................... 29 6.4 RISK RATING CALCULATION ............................................................................................................... 30 7 RECOMMENDED RISK MITIGATION MEASURES ................................................................. 32 BIBLIOGRAPHY ......................................................................................................................... 33 REFERENCES ............................................................................................................................ 36 3 APPENDICES ............................................................................................................................