KOOLE OFFSHORE OPERATIONS MSD 003 Procedure Manual Safe Handling of Mercury Revision Status Rev Issue Date Reason for Issue Prepared Checked Approved A 02-03-2026 Issued for Comments R. Versluis D. Wijngaard W. Van Lingen 1 12/05/2026 Issued for Implementation R. Versluis D. Wijngaard W. van Lingen KOO B.V. T +31 (0)23 558 19 37 Vijfhuizerdijk 110 info@koole.eu Swift/BIC KREDNL2X 2141 BD Vijfhuizen www.koole.eu BTW/VAT NL 868 327 633 B01 KvK/CRN 9802 1931 The Netherlands IBAN NL07 KRED 0633 0337 KOOLE OFFSHORE OPERATIONS Revision Log Rev. 1 Rev. Date 1 12/05/26 May 2026 Section Description of Change Reason Issued for Implementation 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 2 of 22 KOOLE OFFSHORE OPERATIONS Table of Contents Revision Log ................................................................................................ 2 1. Purpose and Scope ................................................................................ 5 Purpose .......................................................................................................................... 5 Scope .............................................................................................................................. 5 Introduction ................................................................................................................... 5 2. Definitions and Abbreviations ................................................................ 6 3. Roles and Responsibilities ..................................................................... 7 RASCI Definitions .......................................................................................................... 7 RASCI Matrix .................................................................................................................. 7 4. Procedure Requirements ....................................................................... 8 Physical Properties of Mercury .................................................................................... 8 4.1.1 4.1.2 4.1.3 Metallic Mercury (Hg0) ......................................................................................................... 8 Inorganic Mercury Compounds .......................................................................................... 8 Organic Mercury Compounds ............................................................................................. 8 Mercury in Offshore Operations ................................................................................... 8 Control of Mercury Vapour ........................................................................................... 9 Identification of Mercury............................................................................................... 9 5. Health Effects and Safety Risks ............................................................. 10 Health Effects of Mercury Exposure .......................................................................... 10 Personal Hygiene Requirements................................................................................ 10 Mercury in Oil and Gas Process Systems .................................................................. 11 Activities with Potential Mercury Exposure .............................................................. 11 Identification of Mercury-Contaminated Systems ................................................... 12 Preparation of Work Activities ................................................................................... 12 6. Measuring Mercury Vapour Concentration ............................................. 13 Measuring Equipment ................................................................................................. 13 Measuring Equipment Table ....................................................................................... 13 Measuring Mercury Vapour Concentration ............................................................... 13 Frequency of Air Measurements ................................................................................ 14 7. Safe Working Method ............................................................................ 14 Measures at Source ..................................................................................................... 14 Collective Protective Measures ................................................................................. 15 Individual Protective Measures .................................................................................. 15 Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 3 of 22 KOOLE OFFSHORE OPERATIONS Personal Protective Equipment (PPE) ........................................................................ 15 8. Material Suspected of Mercury Contamination ...................................... 16 Management of Material Suspected of Mercury Contamination ............................ 16 8.1.1 8.1.2 8.1.3 8.1.4 8.1.5 Materials Without Detectable Mercury Vapour ............................................................... 16 Sampling Requirements .................................................................................................... 16 Transport of Potentially Contaminated Equipment ........................................................ 16 Visible Mercury Contamination ........................................................................................ 17 Recontamination Risk ........................................................................................................ 17 Storage and Disposal Requirements ......................................................................... 17 Cleaning of Mercury Spills .......................................................................................... 17 9. References........................................................................................... 18 Annex I. Flow Chart ‘Material Suspected Of Mercury Contamination’ ......... 20 Annex II. Flow Chart ‘Working Safely With Mercury’ ................................... 21 Annex III. ‘Points Of Attention In The Preparation For Working With Potentially Mercury Contaminated Materials’ ......................................................... 22 Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 4 of 22 KOOLE OFFSHORE OPERATIONS 1. Purpose and Scope Purpose The purpose of this procedure is to establish safe and standardized requirements for the identification, handling, containment, and disposal of mercury encountered during offshore operations, including onboard vessels and floating offshore installations. This procedure aims to: • • • protect personnel from exposure to mercury prevent environmental contamination ensure compliance with applicable offshore and maritime regulations Scope This procedure applies to all personnel, contractors, and third parties working under the operational control of Koole Offshore Operations (KOO) who may encounter mercury during offshore activities. This includes activities involving: • • • • • • produced fluids process systems contaminated equipment instrumentation maintenance and cleaning activities waste handling and disposal The procedure applies to offshore installations, vessels, and supporting marine operations managed by KOO. Introduction Mercury may be present in produced fluids, process equipment, or instrumentation used during offshore oil and gas operations, including floating offshore installations, drilling units, and support vessels. Due to its high toxicity and persistent nature, even small releases may create significant health risks and environmental impact. This procedure provides guidance for: • • • • • mercury identification and detection safe handling practices use of personal protective equipment (PPE) spill response and containment waste management and disposal The procedure supports safe operations and aligns with applicable offshore safety management requirements and maritime regulations, including MARPOL, OSPAR, and flag state requirements. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 5 of 22 KOOLE OFFSHORE OPERATIONS 2. Definitions and Abbreviations Abbreviation / Definition Rev. 1 Description IMDG International Maritime Dangerous Goods Code. LSA Low Specific Activity. PPE Personal Protective Equipment. REACH Registration, Evaluation, Authorisation and Restriction of Chemicals. TLV-TWA – 8h Time-weighted average threshold limit value over an 8-hour period. This value allows short-term exceedance of the threshold limit value, provided this is compensated during the remainder of the working day. Hazardous Substances Substances that, due to their intrinsic properties or the conditions under which they occur, may cause danger, harm, or serious nuisance to people, animals, or the environment. Hazardous substances are classified into hazard classes in accordance with applicable legislation. Material Suspected of Mercury Contamination Material is considered suspected of mercury contamination when mercury has previously been detected or mercury vapour has previously been measured. Material is considered mercury contaminated when the mercury concentration on or within the material exceeds 3% in accordance with Eural European legislation. This includes pipelines, vessels, pumps, installation components, equipment, and waste materials. May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 6 of 22 KOOLE OFFSHORE OPERATIONS 3. Roles and Responsibilities All personnel involved in activities where mercury or mercury-contaminated materials may be present shall work in accordance with this procedure and contribute to continuous improvement by reporting hazards, concerns, and lessons learned. Line Managers are responsible for ensuring this procedure is implemented, understood, and applied within their areas of responsibility. The responsibilities related to operational control and legal compliance are defined in the RASCI matrix below. RASCI Definitions Code Definition Description R Responsible Responsible for performing the task or activity. A Accountable Ultimately accountable for the task or activity. S Supportive Provides support to the responsible person or function. C Consulted Shall be consulted before decisions or actions are taken. I Informed Shall be informed of relevant activities or outcomes. RASCI Matrix Task / Activity Rev. 1 Decom Master Permit Issuer Ensuring and providing information and training R/A Maintaining safe working practices related to mercury Storage and disposal of material suspected of mercury contamination May 2026 Logistics QHSE User R S I R/A R S R R/A R/S R/S Comments / Particularities R 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 7 of 22 KOOLE OFFSHORE OPERATIONS 4. Procedure Requirements Physical Properties of Mercury Mercury exists in three forms: • • • 4.1.1 metallic mercury inorganic mercury compounds organic mercury compounds Metallic Mercury (Hg0) Metallic mercury is a silver-coloured liquid at room temperature. Due to its high surface tension, mercury forms small droplets or spheres. When spilled, mercury can break into very fine droplets that spread easily and may adhere to clothing, footwear, equipment, and skin surfaces. Mercury slowly evaporates at room temperature. As temperature increases, the evaporation rate increases significantly. Mercury vapour: • • • • is toxic has no colour has no odour is heavier than air Because mercury vapour is heavier than air, elevated concentrations may accumulate in low areas, confined spaces, drains, and other poorly ventilated locations. Mercury is insoluble in water but dissolves easily in acids. 4.1.2 Inorganic Mercury Compounds Metallic mercury may oxidise into inorganic mercury compounds such as Hg+ and Hg++. These compounds can form mercury salts with other substances, including: • • Hg2Cl2 HgCl2 Some mercury salts have historically been used in medical applications and batteries. 4.1.3 Organic Mercury Compounds Organic mercury compounds, particularly methylmercury [CH3-Hg]+, are mainly formed in water and soil through bacterial activity. Organic mercury may accumulate in the food chain, especially in fish and marine organisms. Mercury in Offshore Operations This procedure is limited to metallic mercury (Hg0) and mercury vapour. Mercury has a high specific gravity of approximately 13.6 kg/litre. Due to this property, mercury is difficult to remove by flushing with water. Mercury may remain present in: • • • • Rev. 1 low points of systems vessels flanges valves May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 8 of 22 KOOLE OFFSHORE OPERATIONS • • • • • filters pumps pipelines compressors condensers Mercury is commonly found in systems where temperatures decrease or pressure increases. At room temperature, the maximum mercury vapour concentration in air may reach approximately 14 mg/m³. The occupational exposure limit is significantly lower at 0.02 mg/m³. Mercury evaporation may continue for extended periods. Even small quantities may create hazardous vapour concentrations over time. Control of Mercury Vapour Mercury evaporation can be reduced by covering mercury with liquid or powder material. Where practical, drip trays or containment trays containing a thin layer of water should be used to: • • • prevent mercury droplets from dispersing reduce evaporation support safe collection Air monitoring alone does not confirm that equipment or vessels are free from mercury contamination. Mercury may remain present in low areas or in microscopic droplets even when vapour measurements are low. Mercury droplets can easily adhere to clothing, footwear, and equipment and may be transferred into clean areas, creating secondary exposure risks. Good hygiene practices and contamination control measures are therefore essential. Identification of Mercury Mercury is typically recognisable as a silver-coloured metallic liquid forming small droplets. In vessels and enclosed spaces, mercury may often be identified by directing a light source onto surfaces and low points where droplets may accumulate. The quantity of mercury present during oil and gas operations depends strongly on the geological formation and process conditions and may therefore be difficult to predict. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 9 of 22 KOOLE OFFSHORE OPERATIONS 5. Health Effects and Safety Risks Health Effects of Mercury Exposure Exposure to mercury mainly occurs through inhalation of mercury vapour. Inhalation accounts for approximately 80% of mercury uptake into the body. Mercury is poorly absorbed through the digestive system and intact skin. However, mercury may enter the body through: • • • open wounds damaged skin inhalation of vapour Absorption through the eyes is limited. Exposure to mercury vapour may affect health and can result in both short-term and long-term health effects. Possible symptoms include: • • • • • • • • metallic taste in the mouth irritation of the respiratory system nausea fever fatigue headaches twitching of eyelids, lips, or fingers psychological or behavioural changes Long-term or repeated exposure may affect the central nervous system, brain, and kidneys. Health effects are often temporary. However, very high exposure levels may result in permanent injury. Severe mercury poisoning is uncommon and usually occurs when mercury is heated in confined or poorly ventilated spaces. Moderate poisoning is more commonly associated with prolonged exposure to mercury vapour. The current occupational exposure limit for mercury vapour in the Netherlands is: • • 0.02 mg/m³ over an 8-hour working period equivalent to 0.0024 ppm No separate short-term exposure limit has been established. Work involving potential mercury exposure shall only be performed when exposure can be controlled below the applicable occupational exposure limit. Due to the physical properties and health risks of mercury, all work involving potentially contaminated systems or equipment shall follow a controlled and practical risk-based approach. Personal Hygiene Requirements Good personal hygiene is essential to reduce the risk of mercury exposure and contamination transfer. Personnel shall wash their hands: • Rev. 1 after completing or pausing work May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 10 of 22 KOOLE OFFSHORE OPERATIONS • • • • • before breaks before smoking before eating or drinking before using sanitary facilities when leaving the work location Contaminated clothing, PPE, and equipment shall be managed to prevent spread of mercury contamination to clean areas. Mercury in Oil and Gas Process Systems Mercury may be present in oil and gas production systems where mercury or mercury vapour is released from the reservoir and enters the process system. Potential locations where mercury may be present include: • • • • • • • • • • • • • • • • process lines process vessels and tanks glycol reboilers coolers and condensers drain systems pipelines pig launchers and receivers pressure safety valves (PSVs) exchangers filters and filter systems flame arrestors temporary pigging equipment measurement and control equipment sludge accumulation areas stagnant or cold process sections uninsulated flanges Mercury vapour may also be generated during activities involving heat, such as welding or cutting. Activities with Potential Mercury Exposure Mercury or mercury vapour may be encountered during activities including: • • • • • • • • • • • • Rev. 1 opening vessels, pipelines, or pig traps cleaning vessels or tanks breaking flanges cutting piping welding or repair work valve maintenance filter replacement or cleaning work on instrumentation draining systems pigging operations sampling activities gauge maintenance May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 11 of 22 KOOLE OFFSHORE OPERATIONS In principle, any equipment that has been in contact with produced gas, oil, condensate, or produced water shall be considered potentially contaminated. Identification of Mercury -Contaminated Systems An installation or component shall be considered potentially contaminated with mercury when: • • • mercury has previously been detected mercury vapour has previously been measured historical information indicates possible contamination Equipment or piping where mercury accumulation is known or suspected should be clearly identified to support future maintenance and intervention activities. Mercury may penetrate corrosion layers and porous surfaces. As a result, mercury may remain present even after cleaning activities have been completed. A system or vessel that has been cleaned shall therefore not automatically be considered mercuryfree. Mercury levels may increase again over time. Personnel shall remain alert for visible mercury droplets or spheres when opening or inspecting equipment. Preparation of Work Activities All work involving potential mercury exposure shall be properly planned and prepared. Appropriate precautions shall be identified before work starts, including controls for: • • • • • possible mercury release contamination spread exposure prevention waste handling emergency response Personnel involved in the work shall be informed of the potential risks and required control measures. The process for storage and disposal of mercury-contaminated materials is described in: ▪ Appendix 2 – Flow Chart “Working Safely with Mercury” Appendix 2 also includes preparation steps and practical guidance for work involving mercury hazards. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 12 of 22 KOOLE OFFSHORE OPERATIONS 6. Measuring Mercury Vapour Concentration Measuring Equipment Suitable mercury vapour measuring equipment shall be available when working on systems or equipment that may contain mercury. The following equipment, or equivalent approved alternatives, may be used for on-site mercury vapour measurements. Measuring Equipment Table Equipment Work Instruction Particularities Jerome J405 Instructions available with the equipment. Additional guidance may be obtained from the manufacturer instruction material. Not Ex-rated. ATEX requirements shall be considered before use in hazardous areas. Dräger Tubes Instructions available with the equipment. Manual pump required. Measuring Mercury Vapour Concentration When work is performed on systems, equipment, or areas that may be contaminated with mercury: • • • the work area shall be cordoned off a minimum distance of approximately 4 metres around the work area should be maintained where practical systems shall be drained, flushed, and ventilated as far as reasonably practicable before work starts Before entry or work begins, mercury vapour measurements shall be conducted. Measurements are required for two purposes: a. Detection of Mercury Vapour Measurements shall be taken near openings, pipelines, vessels, or equipment to determine whether mercury vapour is present. If visible mercury droplets are identified, additional confirmation measurements near the source are not required before recognising the presence of mercury contamination. b. Exposure Monitoring Where: • • • systems are open during work activities mercury vapour has previously been measured visible mercury droplets have been identified additional measurements shall be conducted during the work to monitor personnel exposure and confirm the suitability of respiratory protective equipment (RPE). Measurements shall be taken within the breathing zone or active work area. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 13 of 22 KOOLE OFFSHORE OPERATIONS Frequency of Air Measurements Activity Measurement Frequency Measuring Equipment General activities with open vessels or process lines in the work area Every 2 hours Jerome mercury meter, Dräger tubes, or equivalent approved mercury vapour indicator Work on process systems without respiratory protection Every hour Jerome mercury meter, Dräger tubes, or equivalent approved mercury vapour indicator Activities requiring full-face respiratory protection or fresh air hood Every 4 hours Jerome mercury meter, Dräger tubes, or equivalent approved mercury vapour indicator Activities requiring selfcontained breathing apparatus (SCBA) No additional routine measurements required N/A Additional measurements shall also be performed when: • • • • • ambient temperature changes by more than 5°C hot work activities are performed process conditions change work scope changes there is doubt regarding mercury exposure levels All measurement results shall be recorded on the applicable registration form and attached to the Permit to Work documentation. Where uncertainty exists, additional measurements shall always be conducted. 7. Safe Working Method The measurement strategy and required control measures for safe work involving mercury shall be determined based on the planned activity, work scope, and identified exposure risk. Appendix 2 – Flow Chart “Working Safely with Mercury” defines the additional control measures required when working on systems, equipment, or locations that may be contaminated with mercury. Control measures shall follow the Occupational Hygiene (OH) Strategy. The hierarchy of controls shall be applied in the following order of preference. Measures at S ource Where reasonably practicable, the source of exposure shall be removed or controlled at the source. Examples include: • • • • Rev. 1 removal of contaminated material isolation of contaminated systems preventing mercury release during work activities substitution of hazardous substances or methods where possible May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 14 of 22 KOOLE OFFSHORE OPERATIONS Collective Protective Measures Where source control is not sufficient or reasonably practicable, collective protective measures shall be implemented to reduce exposure risks. Examples include: • • • • • local exhaust ventilation extraction systems barriers or containment systems enclosed work areas drip trays and containment arrangements Individual Protective Measures Where collective measures alone are insufficient, organisational and individual control measures shall be applied. Examples include: • • • • • limiting exposure duration task rotation restricting access to affected areas controlled work sequencing supervision and monitoring Personal Protective Equipment (PPE) Personal Protective Equipment shall be used when residual risks remain after applying source, collective, and organisational controls. Required PPE shall be determined based on: • • • • • measured mercury vapour concentrations work activity exposure duration environmental conditions task-specific risk assessment Personnel shall use only approved PPE suitable for mercury-related work activities. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 15 of 22 KOOLE OFFSHORE OPERATIONS 8. Material Suspected of Mercury Contamination Material shall be considered potentially contaminated with mercury when: • • • mercury has previously been identified mercury vapour has previously been measured historical contamination is known or suspected Material is considered mercury contaminated when the mercury concentration on or within the material exceeds 3%, in accordance with applicable Eural European legislation. Management of Material Suspected of Mercury Contamination The following principles apply when handling material suspected of mercury contamination. 8.1.1 Materials Without Detectable Mercury Vapour Where no mercury vapour is detected on or within materials, the materials may be considered mercury-free. However, caution remains necessary as mercury may remain trapped within corrosion layers, porous surfaces, or inaccessible internal areas. 8.1.2 Sampling Requirements Waste materials such as: • • • sludge from tanks residues from vessels activated carbon (AC) filters shall always be sampled and analysed for: • • mercury LSA contamination where applicable Where mercury vapour is detected, the mercury concentration shall be determined through laboratory analysis. Samples shall: • • • 8.1.3 be placed in suitable plastic sample containers be packed in approved sample transport boxes be sent to an approved laboratory capable of mercury analysis Transport of Potentially Contaminated Equipment Where equipment or installation components have a history of mercury contamination, but internal measurements cannot fully confirm the absence of mercury, the equipment shall be treated as: ▪ “Possibly Contaminated with Mercury” This applies particularly when equipment is transported for: • • • • repair inspection cleaning disposal An appropriate LSA, Mercury and Benzene Statement Card shall be used where applicable. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 16 of 22 KOOLE OFFSHORE OPERATIONS 8.1.4 Visible Mercury Contamination Where visible mercury droplets or mercury spheres are identified: • • 8.1.5 sampling is not required to confirm contamination the material shall automatically be treated as mercury contaminated Recontamination Risk Mercury may penetrate deeply into corrosion layers and porous surfaces. As a result, mercury may reappear after cleaning activities. A cleaned vessel or installation component shall therefore not automatically be considered permanently mercury-free. Mercury vapour concentrations may increase again after cleaning or ventilation activities. For additional guidance, refer to: ▪ Appendix 1 – Flow Chart “Material Suspected of Mercury Contamination” Storage and Disposal Requirements Strict legal and environmental requirements apply to the storage, transport, and disposal of mercury-contaminated materials. Mercury-contaminated materials shall only be: • • • stored in approved packaging or containers transported in accordance with applicable regulations disposed of through approved waste management routes Suitable packaging and storage arrangements shall be organised before project activities start. The Decommissioning Master or Project Leader shall ensure disposal arrangements are discussed with: • • • the local asset owner the QHSE department relevant waste contractors Where practical, required disposal packaging and storage containers should be available at the worksite before work begins. In exceptional cases, additional regulatory approvals or transport exemptions may be required for large or difficult-to-package contaminated items. Insufficient disposal preparation may result in: • • • project delays temporary onsite storage requirements increased operational costs Before project execution, suppliers and contractors should also confirm whether equipment and materials are resistant to mercury contamination and compatible with potential cleaning methods. Cleaning of Mercury Spills Mercury spills shall be cleaned using: • • Rev. 1 approved mercury spill kits mercury-specific vacuum systems May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 17 of 22 KOOLE OFFSHORE OPERATIONS • approved mercury cleanup procedures Cleanup activities shall follow the manufacturer’s operating instructions and applicable work procedures. After spill response activities: • • reusable PPE and tools shall be cleaned using soap and water where suitable disposable contaminated materials shall be disposed of as mercury-contaminated waste Waste disposal shall follow: ▪ Appendix 2 – Flow Chart “Working Safely with Mercury” Mercury-contaminated materials shall be stored for the shortest practical duration before disposal. 9. References The following legislation, regulations, standards, and reference documents apply to the safe handling, transport, storage, and disposal of mercury and mercury-contaminated materials during offshore operations. Applicable local legislation and regulatory requirements at the location of operation shall always be followed. Where local requirements are more stringent than this procedure, the stricter requirement shall apply, provided personnel safety is not adversely affected. In case of uncertainty or conflicting requirements, the QHSE Manager shall be consulted. Rev. 1 Reference Description Working Conditions Act Including Articles 5, 6, 8, 10, and 16 related to hazardous substances and occupational health protection. Working Conditions Decree Chapter 4 – Hazardous Substances. Working Conditions Regulation Section 4.4 related to hazardous substances exposure control. Safety Data Sheets (SDS) Applicable Safety Data Sheets for mercury and mercurycontaining materials. REACH Registration, Evaluation, Authorisation and Restriction of Chemicals. IMDG Code International Maritime Dangerous Goods Code for transport by sea. ADR European Agreement concerning the International Carriage of Dangerous Goods by Road. MARPOL International Convention for the Prevention of Pollution from Ships. OSPAR Convention Convention for the Protection of the Marine Environment of the North-East Atlantic. NOGEPA Standard 86 Reporting of Accidents and Incidents. Mining Act Applicable Dutch Mining legislation. May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 18 of 22 KOOLE OFFSHORE OPERATIONS Incident Investigation Procedure Applicable KOO incident investigation procedure. Note: Some reference documents may only be available in Dutch. Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 19 of 22 KOOLE OFFSHORE OPERATIONS Annex I. Rev. 1 Flow Chart ‘Material Suspected Of Mercury Contamination’ May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 20 of 22 KOOLE OFFSHORE OPERATIONS Annex II. Rev. 1 Flow Chart ‘Working Safely With Mercury’ May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 21 of 22 KOOLE OFFSHORE OPERATIONS Annex III. ‘Points Of Attention In The Preparation For Working With Potentially Mer cury Contaminated Materials’ • • • • • • • • • • • • • Instructions: Instruct everyone on the risks and procedure of the ‘Safe handling of mercury’ before the start of the work. Agree any cleaning method of equipment and materials contaminated with mercury with stakeholders (contrac-tors) before the start of a project. Ensure that the necessary resources are available to thoroughly rinse the equipment used after completing the work. Contact the logistics if the transport of mercury or materials contaminated with mercury may be necessary. Ensure that the correct and sufficient containment facilities/ spill kits/ mercury vacuum are resent! Consider ex-ceptional cases such as drums for liquids! So do not use screw cap drums but e.g. Offshore/ IBC tanks (ADR) (En-sure correct information regarding this equipment). Make sure you have a valid work permit. Cordon off the work area. Ensure the appropriate measuring equipment is available. Remember to take hygiene measures. Ensure the appropriate PPE is available (see flow charts). Arrange the removal of material suspected of containing mercury in accordance withAppendix 1 Flow chart ‘Ma-terial suspected of mercury contamination’. Consult with Logistics before and during the project to determine whether the agreements made are (still) adequate. Also, regarding the UN classification and labelling for the ac-tual (removal) transport. After packing the mercury-contaminated material in a leak-proof manner, deposit it in a liquidtight cutting skip fitted with lids (e.g. 7m3, (LxWxH: 3.28 m x 1.85 m x 1.70 m, ''boot shaped''). The skip itself is pre-fitted with ro-bust and sufficiently thick pond liner that is eventually tied and taped shut, after which the skip is definitively sealed for transport. Pack all (disposal) and mercury-contaminated material leak-proof by: o o • Primarily sealing openings of contaminated equipment with blind caps or flanges instead of just with duct tape and foil Providing hoses/pipes/connectors/WECO couplings with caps or connecting them to each other (=liquid-tight) If large quantities of mercury contaminated materials are expected, invite a cleaner and/or waste processor dur-ing preparation of the project. Ensure the appropriate collection facilities/spill kits/mercury vacuum are availa-ble! (Provide the proper information regarding this equipment). Rev. 1 May 2026 003.057 Safe Handling of Mercury Uncontrolled when printed – verify latest version in SharePoint 22 of 22