UNEXPLODED ORDNANCE (SEPARATING FACT FROM FICTION)

Transcription

1 UNEXPLODED ORDNANCE (SEPARATING FACT FROM FICTION) Mike Sainsbury, Managing Director 21 June

2 ZETICA WHO ARE WE? Who are Zetica Mapping hazards UXO Risk assessment/desk studies Detection Investigation (EOC) Who is the Special sites & situations Single source Trusted Suppliers (e.g. RPAs) 21 June

3 WHY HERE TODAY? Unexploded Ordnance (UXO)- Addressing the hazards for developments Process Risk assessment Detection Risk mitigation Disposal (Ramora) Addressing Inconsistencies in approach Exaggeration Rumour, hearsay, scaremongering Available guidance Integrated surveys (two birds one stone) 21 June

4 SO WHAT IS THE RISK Sources of UXO today in UK Rich in military history. Forces related. Manufacture/testing. Strategically important locations. Often attacked. Heavily defended. Known and uncharted UXO & UXB from local military activities and enemy activities. 21 June

5 SOURCES OF UNEXPLODED ORDNANCE WWII (& WWI) bombing Strategic targets Clydeside, ROFs Dense in parts UK abandoned bomb register. 21 June

6 SOURCES OF UNEXPLODED ORDNANCE Military activity Temporary camps (British & others) Home Guard/Auxiliary Units Ad hoc training rural area Ranges

7 SOURCES OF UNEXPLODED ORDNANCE Military activity (cont) Barracks Airfields Navy

8 SOURCES OF UNEXPLODED ORDNANCE Munitions manufacturing & handling Testing Storage Disposal areas

9 POTENTIAL UXO HAZARD SOURCES OFFSHORE Offshore bombing (convoys/jettisoning) Munitions disposal areas Ranges Gun batteries Mines (buoyant and seabed) Military wrecks Aircraft crashes Torpedoes UXO migration (storms/tidal action)

10 SO WHAT IS THE RISK Risk Today Many found Left alone/disturbed Planned development - Key is good desk study & risk assessment 21 June

11 RISK ASSESSMENT Recommended practice UK Guidance for UXO assessments and mitigation CIRIA, IExpE, Crown Estates Doesn't need an UXO expert throughout Preliminary assessments (you) UXB maps, internet. Caution for rural areas, bomb maps (showing hits), databases. Pre-desk study assessments. Detailed assessments (UXO specialist) Thorough detailed research Site specific including archive visits Clear objective assessment and advice Provide an understanding of the hazard, risk and how to mitigate it. 21 June

12 RISK ASSESSMENT Risk assessment (Desk study) Critical to understanding risk & ensuring appropriate risk mitigation. Critical to get it right. Sufficient detail Spending time (money) now will save more time/ (money) later Understanding the information available Completeness Corroborative Correct sources (Known UXB) 21 June

13 MITIGATING THE RISK Detection, what are the issues? Depth Depth of ordnance Depth of work/risk Type of ordnance Size Ferrous? Confidence required Safety 21 June

14 MITIGATING THE RISK Depth of detection & noise Many companies Many approaches Differing equipment Law of physics doesn t vary 21 June

15 MITIGATING THE RISK Typical UXB detection depths from surface 50kg ~ 2.0m 250kg+ ~ 5.0m Proved at our Test Site Failure to understand issue of geophysical noise 21 June

16 MITIGATING THE RISK Advantages of approach with various methods/resolution Magnetic or Electromagnetic Ferrous / Non-Ferrous Resolution Size and depth of target Combination/Phasing More discrimination Gross contamination 21 June

17 MITIGATING THE RISK Phase 1(a) Phase 1(b) Phase 2 Magnetics (left), EM61 trolley (middle), EM61 HH (right) Increasing resolution 21 June

18 MITIGATING THE RISK (INTEGRATED SURVEY) While detecting UXO Buried waste/infilled ground Buried obstructions Archaeology Geology and Groundwater Utility Services Reducing Management time/cost Survey costs Impact on site/community Improving Survey effectiveness Understanding 21 June

19 MITIGATING THE RISK Assurance Detection assurance Geophysical prove-out 21 June

20 MITIGATING THE RISK 21 June

21 MITIGATING THE RISK 21 June

22 MITIGATING THE RISK 21 June

23 MITIGATING THE RISK EOD (Explosive Ordnance Disposal) UK situation Commercial solution Reasonable foresee Regulation (poor) Licencing Guidance 21 June

24 MITIGATING THE RISK Advantages Commercial awareness Enhanced safety Less disruption Quicker/better timing Smaller exclusion zones 21 June

25 MITIGATING THE RISK Northstowe New Town Previous bombs created significant disruption Evacuation days/whole town RA/DS identified more could be found in one area. Survey identified 11 targets (3 high probability) 3No. 500lb bombs found Evacuation none! 21 June

26 MITIGATING THE RISK Advantages Commercial awareness Enhanced safety Less disruption Quicker/better timing Smaller exclusion zones 21 June

27 CONCLUSION Importance of detailed risk assessment Appropriate and understood detection Appropriate risk mitigation for the hazard Benefits of integrated surveys Have confidence to ask probing question about:- Appropriate risk evaluation? Appropriate measures to mitigate the risk? Can the residual risk be proven? 21 June

28 MITIGATING THE RISK Wealth of guidance and resources can be found at.com Over to Dave Welch of Ramora 21 June