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APAC Confined Space Procedure S3[APAC]-301-PR1 1. Purpose and Scope a. The purpose of this procedure is to define safe systems of work for performing, managing or supervising confined space entry activities. b. This procedure applies to all confined space entry activities carried out by AECOM employees, contractors and subcontractors in the Asia Pacific (APAC) region. 2. Procedure 2.1 Planning for Confined Space Entry 2.1.1 Assess Space against Confined Space Criteria a. Before accessing any site with potential for confined spaces AECOM should engage with the party in control of site e.g. site owner, client, controlling contractor to enquire if there are any known confined spaces and update the safety risk assessment accordingly. b. Where a project team are considering entering or working in close proximity to a space, which could potentially be a confined space, the Project Manager shall assess this against the confined space definition provided in this procedure, even where AECOM may have been informed by a client that the space is not designated as confined. c. For the purposes of consistency the criteria outlined in Appendix 1 and 2 of this document should be taken as the standard for assessing confined spaces across APAC noting this may be above some local jurisdictional requirements. Approval to vary from this definition can only be provided by the relevant Regional SH&E Director. d. Where a confined space is confirmed this shall be communicated to all project team members (including subcontractors). 2.1.2 Assess Need to Enter Confined Space a. Prior to undertaking any confined space work the Project Manager shall assess the need to enter the space. b. All reasonably practicable steps shall be taken to eliminate the need to enter confined spaces due to the high risk nature of this activity and risk of serious injury or death of not entry is not managed correctly. c. Where entry to a confined space is unavoidable, the Project Manager shall develop a safe system for working inside the confined space that takes account of this procedure and any local regulatory confined space entry requirements. d. Where workers are working in close proximity to a confined space, without planning to enter the space, the Project Manager shall inform workers of the confined space and assess whether additional safety controls such as signage or barricading need to be put in place to prevent inadvertent access to the space. 2.1.3 Complete Risk Assessment a. The Project Manager, in conjunction with suitably trained confined space personnel and other key project personnel, shall complete and document a risk assessment in the form of a Safe Work Method Statement (or equivalent) for the proposed confined space entry works. b. The risk assessment shall take into account as a minimum the following: i. The nature of the space (e.g. temperature, humidity, lighting, presence of biological hazards, slippery surfaces, trip hazards, etc.). PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 1/10

i iv. The level of oxygen and atmospheric contaminants. The work and work method (consider whether the work or work method will introduce any new hazards or contribute to the risks of working in the confined space). Work being done around the work area that may affect the work within the confined space (e.g. fumes from a combustible engine, amplified noise). v. The means of entry and exit (consider the number, size and location and the equipment required to gain access and exit). vi. v vi Risks associated with the use of PPE. Personnel capabilities and characteristics (e.g. size, manual handling strength, claustrophobia, etc.) The type of emergency procedures required. c. Control measures shall be regularly reviewed and revised to ensure a safe system of work is maintained. Records of reviews shall be maintained in the project specific risk assessment (e.g. Project SHEMP/SWMS) and/or on project audit/inspection records d. Completed risk assessments for confined space entry works shall be maintained in the project folder for a minimum of 2 years. 2.1.4 Assign Entry Supervisor a. An Entry Supervisor shall be assigned for all Confined Space Entry Works. b. The Entry Supervisor is responsible for: i. Ensuring that a Confined Space Entry Permit is completed and verifying that all conditions of entry outlined in the permit have been satisfied prior to confined space entry work commencing. i iv. Conducting a pre-start meeting and ensuring all team members sign and understand task risk assessment(s). Ensuring a rescue plan is understood and rehearsed prior to task commencing. Ensuring all team members involved in the activity are trained, competent and fit for work. v. Ensuring effective and reliable communications have been established. vi. Carrying out the role of a Standby Person (as required). 2.2 Confined Space Entry 2.2.1 Confined Space Entry Permit a. A Confined Space Entry Permit must be completed prior to completing any confined space entry works. Refer to Confined Space Entry Permit, (or other suitable third party confined space entry permit) shall be used for this purpose. b. A person is deemed to have entered a confined space once their head or any part of their upper body enters the space. Inserting an arm only is not considered entry. c. The Confined Space Entry Permit shall be prepared and issued by the approved Entry Supervisor. d. The permit shall only be issued for the duration of the shift (maximum 12 hours). e. Prior to signing, the Entry Supervisor must inspect the location to ensure that applicable precautions have been implemented, and all relevant information concerning the entry parameters are documented in the permit. f. All personnel performing works associated with the confined space entry shall be briefed in the permit requirements by the Entry Supervisor and sign the Confined Space Entry Permit. PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 2/10

g. On the completion of the works the Entry Supervisor will cancel the permit by signing and recording the date and time on the permit. Where required (e.g. closing a manhole cover or similar) the confined space will be sealed and returned to its original pre work safe condition. h. If the confined space cannot be closed until a later time, provisions must be maintained (barricades, warning signs) to highlight the dangers and stop unauthorised persons from entering the confined space. i. Completed Confined Space Entry Permits shall be maintained in the project folder for a minimum of 2 years. 2.2.2 Isolation a. Before commencing any works all hazardous services to the confined space must be isolated. b. If liquids, gases or vapours could enter the confined space the pipe work should be physically isolated. Where reasonably practical double isolation controls shall be implemented. c. Isolation, blocking or de-energizing can only be carried out by suitably trained and competent person(s). d. Before entry is permitted to any confined space that can move, or in which agitators, fans or other moving parts that may pose a risk to workers are present, the possibility of movement should be eliminated. 2.2.3 Stored Energy a. Before entry to any confined space any equipment or devices in which stored energy may pose a risk the equipment and or devices must be de -energised by way of isolation, blocking or de energising. A lock should be applied to the equipment and or devices with the key held in the possession of the person locking the lock. A tag should also be attached indicating the name of the person who is in the confined space. For more information reference Lockout and Tagout (LOTO) Procedure. 2.2.4 Atmospheric Testing a. Atmospheric testing of the confined space shall be conducted by the Entry Supervisor to ensure a safe atmosphere. A safe atmosphere in a confined space is one that: i. Has a safe oxygen level (within range of 19.5%-23.5%) i Is free of airborne contaminants or any airborne contaminants are in concentrations below their allowable exposure standard (if any). Any flammable gas or vapour in the atmosphere is at concentrations below 5% of its LEL. b. Testing needs to be done immediately prior to entry, before an entry permit is issued, and may need to be conducted at regular intervals or continuously during the entry depending on the circumstances. c. Gas detectors used for atmospheric monitoring must be: i. Fully charged with replacement batteries or charger available. i Calibrated in accordance with manufacturers specifications. Fresh air and bump tested against a known concentration of an applied gas mixture (usually methane). Where a gas detector fails the bump test it must be recalibrated and bump tested until it is reading the correct concentration of the applied gas mixture. If the device does not register the correct concentration at this stage works must not proceed until a replacement device is sourced and has satisfactorily completed the steps above. d. Initial testing should be done from outside the confined space by inserting a sample probe and/or portable gas detection device at appropriately selected access holes, nozzles and openings. Because contaminants can settle at different levels, each part of the confined space should be tested (side to side and top to bottom). Peak readings from bump testing and all pre-entry checks are to be recorded on the entry permit. e. Ignition sources must not be brought into a confined space where there is a risk of fire or explosion. Intrinsically safe tools, lighting and ventilation equipment should be used within the confined space as required. PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 3/10

f. A safe atmosphere can be achieved within the confined space using methods such as cleaning, purging and ventilation. 2.2.5 Purging a. Where atmospheric testing indicates unacceptable levels of containments the space must be purged. b. Purging must be done prior to any work commencing in a confined space by way of an inert gas, such as nitrogen to clear flammable gases or vapours which have been identified. 2.2.6 Ventilation a. Sufficient ventilation must be provided whilst anyone is in a confined space to ensure a safe atmosphere and temperature. This must be provided by way of fresh air, by natural, forced or mechanical means. b. Where mechanical ventilation equipment is used to maintain acceptable contaminate levels the confined space must be monitored by equipment on a continuous basis whilst person(s) are in the space. c. Where mechanical ventilation equipment is used it must have the controls (including any remote power supply) clearly identified, tagged and protected to guard against unauthorised interference. Checks should be carried out to verify source and discharge points for all ventilation systems. d. Pure oxygen or gas mixtures with an oxygen concentration > 21% must never be used to purge or ventilate a confined space. e. Placement of ventilation ductwork needs to ensure no pockets of harmful contaminants can accumulate within the space. Efforts should be made to create good even air flow through the entire space. 2.2.7 Respiratory Equipment a. Where there is any doubt that a confined space contains a safe oxygen level or safe levels of airborne contaminant s then appropriate respiratory protective equipment shall be used to enter the confined space. b. The appropriate respiratory protective equipment should be selected based on the level and type of contaminants and work to be done. c. Selection, use, and maintenance of respiratory equipment must be identified in the confined space risk assessment. d. Note there are additional requirements around ensuring Fitness for Work as per Employee Medical Surveillance Procedure for staff using respirators. 2.2.8 Lighting a. The confined space must be sufficiently lit to allow safe access/egress and work to be performed safely. b. Lighting must be intrinsically safe unless atmospheric monitoring can confirm flammable gas levels are below 5% of their LEL, before lights are switched on or off. 2.2.9 Communication and Safety Monitoring c. A communication system is needed to enable communication between people inside and outside the confined space and to summon help in an emergency. d. Depending on the conditions in the confined space, communication can be achieved by voice, radio, hand signals or other suitable methods. e. All communication devices used in confined spaces must be rated as intrinsically safe (meaning low current/voltage electrical equipment that limits potential for ignition in hazardous areas). PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 4/10

2.2.10 Standby Person a. A Standby Person shall be identified and assigned to monitor the confined space entry. b. The Standby Person has the following key responsibilities: i. Remain outside the confined space and do no other work that may interfere with their primary role of monitoring the workers inside the space. Eliminate (or minimise) distractions including eating and drinking, texting, games, music, and other people not involved in task. i iv. Understand the nature of the hazards inside the particular confined space and be able to recognise signs and symptoms that workers in the confined space may experience. Operate and maintain communication systems and devices with the entry person or team. Maintain visual, audible, radio or other agreed means of contact. Confirm that the air quality testing is carried out and maintained within the safe range. v. Have all required rescue equipment (for example, safety harnesses, lifting equipment, a lifeline etc.) immediately available if needed. Assist with aces and emergency response if required. vi. v vi Order workers to exit the confined space if any hazardous situation arises. Prevent unauthorised persons from entering Never to enter the confined space to attempt rescue. c. The Standby Person must remain at the entrance whenever an entrant is inside the confined space and may not be assigned other duties that may distract him/her from maintaining uninterrupted contact with the entrant(s). d. The Standby Person may only attend to one confined space entry at any one time. 2.2.11 Entry and Exit Procedures a. Entry and exit procedures shall be developed for the confined space entry. b. Entry and exit points to the confined space must be clear and unobstructed at all times during the confined space entry. c. The Standby Person shall order entrant(s) out of the confined space whenever: i. A prohibited condition on the entry permit develops. i iv. The surrounding work area becomes unsafe. Any monitoring instrumentation, rescue equipment, ventilation, etc. becomes compromised. Possible symptoms of exposure are noted in the entrant(s). v. Person(s) within the confined space express any type of concern regarding safety inside the confined space. 2.2.12 Signage and Barricading a. Prior to any work commencing in a confined space signs must be erected to identify the area as a confined space and authorise entry by permit only. b. Sign must be erected in an obvious position close to each entry/egress point. 2.2.13 Emergency Procedures a. First aid and emergency rescue procedures must be established within an emergency response plan prior entry into the confined space. b. Risk assessment should determine the need for workers to carry re-breather devices on them (per person) to enable self-rescue. As a general guide, in any confined space where the time taken to exit under emergency conditions is greater than 2 minutes a re-breather should be taken. PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 5/10

c. All workers performing work associated with the confined space entry must be briefed on these procedures prior to works commencing. d. The emergency response plan shall be attached to the confined space entry permit. 3. Training a. Training is required for all parties completing entry into a confined space or performing roles of Entry Supervisor (including permit issuer) or Standby Person and must be: i. Compliant with local legislation. i Delivered by a registered/ accredited training organisation or to the standard defined by local jurisdictional legislation. Refreshed as per local legislative requirements or guidance material. In the absence of any such requirements a two yearly refresher is suggested. b. It is recommended the Standby Person possess a current First Aid training certificate. a. The Project Manager shall ensure confined space training records are maintained in the project folder or in a Business Line SH&E training folder for a minimum of 2 years. 4. Medical Surveillance a. All persons entering the confined space must participate in the AECOM medical surveillance program and have up to date fitness-for-work certificates including, where applicable, lung function acceptable for using respiratory protective equipment. b. Where this is not implemented the Regional SH&E Director needs to ensure an adequate process is established to assess the fitness of individuals conducting confined space entry prior to completing this task and provide clear instruction to not perform this activity where there are concerns around fitness for work. c. Where persons entering the confined space may be exposed to wastewater they must have received vaccinations to protect against Hepatitis A and B, Tetanus, Typhoid and Polio and completed a test to confirm antibodies. d. For more information on the requirements in this section refer to Employee Medical Surveillance Procedure. 5. Terms and Definitions Define only those terms mentioned within the document and list using Alpha List option from the AECOM Procedure List dropdown on the Home tab. a. Asphyxiant An airborne substance which can cause suffocation. Simple asphyxiates (e.g., carbon dioxide, nitrogen, argon, etc.) physically displace oxygen from the atmosphere while chemical asphyxiates (e.g., carbon monoxide, hydrogen cyanide, etc.) prevent the body from utilizing oxygen in the atmosphere. b. Confined Space An enclosed or partially enclosed space that: i. is not designed or intended primarily to be occupied by a person and is designed or intended to be, at normal atmospheric pressure while any person is in the space: and i is likely to be a risk to health and safely from: an atmosphere that does not have a safe oxygen level, or contaminants, including airborne gases, vapours and dusts, that may cause injury from fire or explosion, or harmful concentrations of any airborne contaminants, or Engulfment. i. How to determine a confined space A confined space is determined by the structure and a specific set of circumstances. The same structure may or may not be a confined space depending on the circumstances when the space is entered. Entry to a PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 6/10

confined space is considered to have occurred when a person s head or upper body enters the space. A space may become a confined space if work is to be carried out in the space would generate harmful concentrations of airborne concentrates (see Attachment 1 and 2 for further information on how to determine if the area to be entered is a confined space) c. Confined Space Entry Permit A written or printed document that controls entry into a permit-required confined space. The permit provides a formal check to ensure all elements of a safe system of work are in place before people are allowed to enter the confined space. d. Engulfment To be swallowed up in or be immersed by material that may result in asphyxiation. e. Hazardous Atmosphere An atmosphere that may expose employees to the risk of death, incapacitation, impairment of ability to self-rescue, injury, or acute illness from one or more of the following: Oxygen concentrations below 19.5%; i Flammable atmospheres (concentrations > 5% of the lower explosive limit); iv. Toxic environments (concentrations > than the permissible occupational exposure limit). f. Hot Work Any task which may produce a spark or source of ignition (e.g., welding, cutting, etc.) in areas potentially containing flammable gases or vapour. g. Inerting Displacement of the atmosphere by a nonreactive gas (such as nitrogen, carbon dioxide) to such an extent that the resulting atmosphere is non-flammable. h. Lower Explosive Limit (LEL) The lowest concentration of a flammable gas/vapour in air which will ignite. i. Occupational Exposure Limit (OEL) An exposure limit is the airborne concentration of a particular substance in the employee s breathing zone which, according to current knowledge, should not cause adverse health effects nor cause undue discomfort to nearly all employees. j. Oxygen Deficiency An atmosphere with an oxygen concentration less than 19.5%. Normal air contains approximately 21% oxygen. k. Physical Hazard A non-chemical hazard which may cause cuts, abrasions, crushing, trauma, hearing loss, burns, or radiant energy effects (e.g., welding). l. Standby Person An individual who is permanently stationed outside a confined space to monitor the authorized entrants and to initiate emergency response if necessary. This person should never enter the confined space, though needs to be trained and competent around confined space entry, and needs to be able to maintain effective communication with the authorized entrants. This person can also perform the role of an Entry Supervisor as long as they have received the required training for this role. m. Upper Explosive Limit (UEL) The highest concentration of a flammable gas/vapour in air which will ignite. n. Entry Supervisor A competent person who has completed appropriate training in the use and issue of confined space entry permits. This person can also perform the role of a Standby person as long as they have received the required training for this role. 6. References a. Employee Medical Surveillance Procedure S3[APAC]-128-PR1 b. Lockout and Tagout (LOTO) Procedure S3[APAC]-325-PR1 7. Records a. Confined Space Entry Permit S3[APAC]-301-FM2 8. Appendices a. Appendix 1 - Confined Space Criteria b. Appendix 2 - Determining if a space is a Confined Space PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 7/10

9. Change Log List the change history pertaining to this document including if it was identified differently throughout its life-cycle: Rev # Change Date Description of Change 0 May 8, 2018 Initial Release All Location of Change PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 8/10

Appendix 1 Confined Space Criteria (also reference Appendix 2) PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 9/10

Appendix 2 Determining if a space is a confined space (also reference Appendix 1) PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 10/10