Expo 2030 Riyadh KAFD Building 1.10, Floor 17 KAFD City Riyadh 12512 Saudi Arabia MAIL TYPE Workflow Transmittal MAIL NUMBER BECHTEL-WTRAN-019702 REFERENCE NUMBER BECHTEL-WTRAN-019702 Final (WF-019800) ABD-0062-HSW-PLN-00006 Weather Working and Heat Stress Mgt. Plan From Mr Hamada Fathalla - Bechtel Global To (5) Cc (3) Sent Thursday, 27 August 2026 3:33:01 PM AST (GMT +03:00) Status N/A Hamada Fathalla Final (WF-019800) ABD-0062-HSW-PLN-00006 Wea... 3:33 PM BECHTEL GLOBAL WORKFLOW TRANSMIT... BECHTEL-WTRAN-019702 Mr Mohamed Favas - Abyatona Development Company (+4 more...) Ms Noura AlSaweed - Expo Riyadh Company (+2 more...) DOCUMENT ATTACHMENTS (2) ( 0 selected) File Document No Revision Revision Date Title Status ABD-0062-HSW-CRS- 00007 05 23/08/2026 Weather Working and Heat Stress Mgt. Plan A - Approved ABD-0062-HSW-PLN- 00006 05 23/08/2026 Weather Working and Heat Stress Mgt. Plan A - Approved MESSAGE Workflow Review History The attached documents have completed the "ABD-0062-HSW-PLN-00006 Weather Working and Heat Stress Mgt. Plan" workflow with the following results : This transmittal was automatically generated. Doc No Step Participant Review Outcome Comments ABD-0062-HSW-CRS- 00007 PMC DCC Review H Fathalla A - Work May Proceed ABD-0062-HSW-PLN- 00006 PMC DCC Review H Fathalla A - Work May Proceed Weather Working and Heat Stress Mgt. Plan Design & Build of ERC Headquarter Complex Document No:ABD - 0062 - HSW - PLN - 00006 Document Revision: 0 5 Document Revision Date: 23 /0 8 /2026 Signatures Revision History Revision Code Description of Changes Purpose of issue Submission Date 01 For Approval 23/04/2026 02 For Approval 18/05/2026 03 For Approval 13/06/2026 04 For Approval 1 2 /08/2026 0 5 For Approval 23 /08/2026 Name Prepared By Eleumar Carmona Reviewed by Ahmad Obeidat Approved By Ahmad Obeidat Job Title HSE Manager Project Manager Project Manager Document No.: ABD - 0062 - HSW - PLN - 00006 Document Name: Weather Working and Heat Stress Mgt. Plan EXPO 2030 RIYADH COMPAN ABD - 0062 - HSW - PLN - 00006_05 Page | 2 Weather Working and Heat Stress Management Plan 1. INTRODUCTION ................................ ................................ ................................ ........................ 5 2. PURPOSE ................................ ................................ ................................ ................................ .. 5 3. SCOPE ................................ ................................ ................................ ................................ ...... 5 4. DUTIES AND RESPON SIBILITIES ................................ ................................ ................................ .. 5 PROJECT MANAGER ................................ ................................ ................................ ................................ .......... 5 CONSTRUCTION MANAGER ................................ ................................ ................................ ................................ ..... 5 SITE ENGINEER ................................ ................................ ................................ ................................ .................... 6 SUPERVISORS / FO REMAN ................................ ................................ ................................ ................................ ...... 6 SAFETY MANAGER ................................ ................................ ................................ ................................ ................ 6 SAFETY SUPERVISOR ................................ ................................ ................................ ................................ ............. 6 MEDICAL PERSONNEL / FIRST AIDER ................................ ................................ ................................ ......................... 7 PROJECT MEDICAL PERSONNEL ................................ ................................ ................................ ................................ 7 EMPLOYEES ................................ ................................ ................................ ................................ ........................ 7 5. HEAT STRESS MANAGEMENT ................................ ................................ ................................ ..... 7 5.1 Working Hours and Heat Stress Restricted Working Periods ................................ ................................ ............. 8 5.2 Procurement, Supply and Delivery of Drinking Water ................................ ................................ ...................... 9 5.3 Protection of Employees from Hot Climate ................................ ................................ ................................ ..... 9 5.4 Work Environment Provisions for Hot Climate ................................ ................................ ................................ 9 5.5 Information of Daily Weather Advisory ................................ ................................ ................................ ........ 10 5.6 Hot Climate Work Time and Regulations ................................ ................................ ................................ ...... 10 5.7 Work Environment Temperature Monitoring ................................ ................................ ................................ 10 5.8 Reporting Heat Stress Incidents ................................ ................................ ................................ ................... 10 5.9 Factors and Conditions ................................ ................................ ................................ ............................... 11 6. WORKING IN HEAT ................................ ................................ ................................ ................... 12 6.1 MEDICAL SURVEILLANCE AND FITNESS FOR WORK PROGRAM ................................ ................................ ....... 14 6.2 Permit to Work System ................................ ................................ ................................ ............................... 15 6. 3 Heat Stress Audit, Inspection, Compliance Verification and Reporting ................................ ............................. 16 7. HEAT STRESS DANGER CATEGORY ................................ ................................ ............................. 18 7.1 TWL High - Risk Zone and Permit to Work ................................ ................................ ................................ ...... 18 7.2 Heat Index Table: ................................ ................................ ................................ ................................ ....... 20 7.3 Ex posure category and possible heat syndrome ................................ ................................ ............................ 20 7.4 Flag system and Heat Index Scale ................................ ................................ ................................ ................ 21 7.5 Wet Bulb Globe Temperature (WBGT) methodology: ................................ ................................ .................... 21 7.6 WBGT - Table ................................ ................................ ................................ ................................ .............. 21 7.7 WBGT Flag Code system, Exposure category and possible Heat syndrome ................................ ....................... 22 7.8 WBGT Monitoring Log Sheet ................................ ................................ ................................ ....................... 22 8. CONTROL OF HEAT STRESS ................................ ................................ ................................ ....... 23 8.1 Engineering Controls ................................ ................................ ................................ ................................ .. 23 8.2 Administrative Controls ................................ ................................ ................................ .............................. 23 8.3 Personal Protective Controls ................................ ................................ ................................ ....................... 26 ABD - 0062 - HSW - PLN - 00006_05 Page | 2 Weather Working and Heat Stress Management Plan 9. WORKING AT HEIGHT HEAT STRESS CONTROLS ................................ ................................ ......... 26 10. SAFETY MEASURES AND ARRANGEMENTS FOR WORKING IN HOT WEATHER .............................. 26 10.1 Communicati on ................................ ................................ ................................ ................................ ........ 26 10.2 Rest Shelter ................................ ................................ ................................ ................................ ............. 26 10.3 Work Arrangements ................................ ................................ ................................ ................................ 27 10.4 Rest Period ................................ ................................ ................................ ................................ .............. 27 10.5 Provision of Potable Water ................................ ................................ ................................ ........................ 27 10.6 Suitable Clothi ng and Personal Protective Equipment (PPE) ................................ ................................ ......... 27 11. TRAINING ................................ ................................ ................................ ................................ 2 8 12. HEAT - RELATED ILLNESS ................................ ................................ ................................ ............ 28 12.1 Heat Cramps ................................ ................................ ................................ ................................ ............ 28 12.2 Heat Ex haustion ................................ ................................ ................................ ................................ ....... 29 12.3 Heat Stroke ................................ ................................ ................................ ................................ .............. 29 13. PLANNING FOR FATIGUE MANAGEMENT ................................ ................................ .................. 30 14. HEAT STRESS NOTIFICATION SYSTEM AND INCIDENT FLOWCHART ................................ ............. 31 14.1 Emergency Response Team Flow Chart ................................ ................................ ................................ ...... 32 14.2 ABYATONA Emergency Contact Information ................................ ................................ ............................... 33 15. COLD WEATHER WORKING CONDITIONS ................................ ................................ ................... 33 16. REFERENCES ................................ ................................ ................................ ............................ 34 Weather Working and Heat Stress Management Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 5 1. INTRODUCTION The hot and humid summers in Saudi Arabia may lead to working under high temperatures on construction sites. It will therefore be crucial to take appropriate safety measures to protect site personnel working in hot weathers (i.e. the physical and physiological reactions of the worker to temperatures that fall outside normal comfort zone). As further development work is required for adopting such system in the Kingdom, this procedure sets out some of the good practices that may be readily implemented by ABYATONA during the summer months to enhance the safety of the site personnel. Summer days in Saudi Arabia are hot and humid, workers who work in hot environment heat generation procedures for a prolonged period, especially those construction workers with heavy manual work, may suffer from heat strokes or other heat - related disorders if no appropriate measures are taken. It can be harmful to workers’ health. To minimize the risk towards site personnel working in hot weather. This Plan not only ensures safety and health protection to construction workers, but also enhance the work efficiency and productivity, thus creating a win - win situation for both employers and workers. 2. PURPOSE The purpose of this plan is to set the minimum standard of heat stress prevention, control and management in peak temperatures from 15 June to September 15 as per Saudi Arabia Government rules and regulation. To give safety guidelines and measures to ABYATONA employees who are to be exposed to hot working environment or otherwise at risk of injury or illness due to heat stress factors, in order to help ensure the elimination and reduction of heat stress related injuries or illnesses. 3. SCOPE This procedure details the instructions and recommendations for working in extreme hot weather conditions. To provide a standard that is compatible with the work process to allow workers protection in extreme hot weather conditions. 4. DUTIES AND RESPONSIBILITIES PROJECT MANAGER Responsible for ensuring implementation and assigning Health and Safety accountabilities as defined by this procedure, as well as ensuring the availability of resources to enable the successful implementation of the requirements of this procedure. The Project Manager shall ensure that the Emergency Response Team (ERT) structure and emergency contact directory are maintained, communicated to all personnel, periodically tested through drills, and kept readily available at all project locations. CONSTRUCTION MANAGER • Responsible for ensuring compliance with this Weather Working and Heat Stress Management Plan. • Ensure the effectiv e implementation, monitoring, and continual improvement of the Heat Stress Management Program in accordance with the Expo Riyadh Construction Safety Manual (ERCSM), ERC project requirements, approved HSE procedures, and applicable Saudi Arabian Weather Working and Heat Stress Management Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 6 • legislation. • Ensure adequate resources, supervision, welfare facilities, and operational controls are available to protect personnel from heat - related risks and to achieve full compliance with ERC/PMC requirements. SITE ENGINEER • Ensure the implementation of heat stress plan to avoid heat related illnesses; this will include, but not be limited to, conducting an assessment of tasks in order to identify possible work practices or environments that have the potential to cause heat stress. • Do not let schedule or productivity demands supersede heat stress awareness or controls used to prevent heat - related illness. SUPERVISORS / FOREMAN • Supervisors are responsible for monitoring weather conditions at the jobsite and adjusting work schedules as necessary, encouraging employees to frequently consume water and take periodic rest breaks when working in hot conditions, monitoring employees for signs of heat stress, providing appropriate first aid, and contacting emergency services if necessary. • Provide drinking water stations (e.g. coolers with chilled or ice water) for workers and remind them to drink plenty of water even if not thirsty. • Monitor the heat - related health condition of employees, as well as the effectiveness of any engineering/administrative contro ls and personal protective equipment (PPE) being used. • Be act knowledgeable of emergency reporting and response procedures, including the location of the nearest medical facility, including the location of the nearest medical facility with a qualified medical doctor who can provide proper treatment for a victim of severe heat exhaustion or heat stroke. SAFETY MANAGER • Ensure implementation of the Heat Stress Management Plan • Monitor and record TWL and weather conditions and ensure appropriate controls ar e implemented. • Ensure required work/rest cycles, hydration, shade, and cooling facilities are provided. • Ensure acclimatization requirements are implemented for new and returning workers. • Ensure PTW is applied for work within the TWL High - Risk Zone and extr eme heat/high humidity conditions. • Ensure workers and supervisors receive heat stress awareness and emergency response training. • Conduct routine site inspections and compliance verification of heat stress controls. • Ensure heat stress incidents are reported , investigated, and corrective actions implemented. • Monitor adverse weather conditions and ensure work is modified, suspended, or rescheduled when required. • Maintain records of TWL readings, inspections, training, PTWs, incidents, and corrective actions. SAFETY SUPERVISOR • Safety Supervisor shall ensure that the requirements of this procedure are communicated throughout the organization through education such as Toolbox talks, Training, Posters or visual aid and Safety Campaign. Weather Working and Heat Stress Management Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 7 • The HSE Manager shall mainta in the Emergency Response Team roster, verify emergency contact details, coordinate emergency drills, and ensure immediate notification to ERC/PMC in accordance with the approved Incident Notification and Reporting Procedure. MEDICAL PERSONNEL / FIRST AID ER • Medical Personnel / First Aider shall ensure that sufficient quantities of electrolyte and other forms of treatment are available in the medical center / area for the handling of any patients suffering from any heat - related illness. PROJECT MEDICAL PER SONNEL • The Project Medical Personnel shall implement and maintain the Medical Surveillance Program, conduct pre - employment and periodic medical examinations, evaluate workers' fitness for heat - exposed duties, identify personnel with medical conditions that may impair heat tolerance, maintain confidential medical records, advise management on work restrictions, support return - to - work assessments following heat - related illness, and provide ongoing occupational health guidance in accordance with ERCSM Section 1 3 .15. EMPLOYEES • Follow instruction for controlling heat stress; including taking periodic “cool down” breaks and drinking enough water. Begin drinking water early in the day. • Wear appropriate clothing (e.g., light colored, lightweight, breathable, loose clothing is best). • Know and be alert for signs/symptoms of heat - related illness in themselves and others. • Take appropriate action upon developing symptoms of heat cramps, heat exhaustion or heat stroke. • ABYATONA and/or subcontractors should establish safe systems for working in hot weather by referring to the good practices in this Guidelines where appropriate and should provide adequate training, information, instruction and supervision to construction workers and site supervisors to facilitate and ensure its adoption. • Furthermore, as the Guidelines is not intended to be exhaustive, the ABYATONA and /or subcontractors should determine the safety measures to be implemented through the risk assessment for site heat stress. • ABYATONA and /or subcontractors shou ld consider providing training on heat stress management for site management personnel, so as to equip them to identify heat impact on workers and the potential risks arising from heat stress. • Construction workers should be aware of their physical conditio ns and avoid over exertion. Workers should inform their colleagues and supervisors upon sensing symptoms of heat stress, and he/she should take rest and suitable drinks immediately. • Construction workers should take note of and comply with the relevant site safety guidelines for working in hot weather as set out by ABYATONA and/or subcontractors. 5. HEAT STRESS MANAGEMENT ABYATONA occupational environment and/ or physical activities may expose their workers to temperatures, which could be excessive and may threaten their health and productivity. The following services as a guideline managing work in high temperature environments and/ or during the summer period, as per “Ministerial Decree amending the working hours under direct sun, this resolution shall com e into force as of 15 June to 15 September of each Gregorian Year. This resolution is considered as an integral part of the Ministerial Decree No. (1/1559) dated 22/06/1431H (05/06/2010G).” Weather Working and Heat Stress Management Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 8 5.1 Working Hours and Heat Stress Restricted Working Periods The working hours defined below represent the actual site reporting and work activity periods and shall not be interpreted as including travel time between workers' accommodation and the project site. Workers shall be required to arrive at the site and report to their designated work location before the commencement of the applicable working hours . Travel time from accommodation to the site, and travel from the site to accommodation after completion of the shift, shall be managed separately by the Contractor a nd shall not be counted as site working hours. Supervisors shall ensure that workers are not required to perform site activities outside the approved working periods, except where specifically authorized in accordance with the project requirements and app licable heat stress controls. 1. Offices and Activities Not Directly Affected by Sunlight For offices and work activities that are not directly exposed to sunlight, the following working hours shall apply: • Morning Session: 07:00 AM to 12:00 PM • Lunch Break : 12:00 PM to 01:00 PM, No Work • Afternoon Session: 01:00 PM to 0 6 :00 PM The above schedule applies to indoor activities and other work areas where workers are not directly exposed to solar radiation. 2. Site Activities Directly Affected by Sunlight For construction activities and other work performed in areas directly exposed to sunlight, the following working hours shall apply: • Morning Session: 07:00 AM to 12:00 PM • Heat Stress Restricted Period / Lunch Break: 12:00 PM to 03:00 PM, No Work • Afternoon Sess ion: 03:00 PM to 06:00 PM During the 12:00 PM to 03:00 PM restricted period , workers shall not perform activities in areas directly affected by sunlight. This period shall be used for rest, recovery, hydration, meals, and other suitable welfare arrangements. 3. Reporting, Travel and Leaving the Site The working - hour schedules above refer specifically to site activities and working time . Travel time between workers' accommodation and the project site is 30 minutes each way and shall be considered separately from the scheduled site working hours. • Travel from accommodation to site: 30 minutes before the scheduled site working time. • Travel from site to accommodation: 30 minutes after completion of the scheduled site working time. • The 30 - minute trave l period shall not be considered as site working time. • Workers shall be transported to the site in sufficient time to arrive and report before the scheduled start of work , including time required for site access, attendance, toolbox talks, and pre - start a ctivities. • At the end of the scheduled working period, workers shall leave the site in accordance with the approved transportation arrangements. Weather Working and Heat Stress Management Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 9 5.2 Procurement, Supply and Delivery of Drinking Water The Abyatona shall ensure that an adequate supply of safe, potable cold drinking water is available at the project site throughout all working periods, particularly during periods of elevated heat stress. • Drinking water shall be available at the site before the start of each work shift and shall be confirmed as part of the daily pre - start arrangements. • Adequate quantities of potable drinking water shall be provided based on the number of workers, expected working duration, weather conditions, and heat stress exposure. • Drinking water shall be readily accessible and positioned close to work areas so workers do not need to travel significant distances to obtain water. • Water coolers/dispensers and sealed drinking - water containers shall be maintained in clean and hygienic co ndition. • Drinking water supplies shall be replenished throughout the shift to prevent shortages. • During periods of high heat stress, additional drinking water and electrolytes shall be provided as required based on heat stress monitoring and the applicable work/rest regime. • The HSE team and supervisors shall verify the availability of drinking water during daily site inspections and pre - start checks. • No work shift shall commence unless adequate drinking water is available at the site and accessible to the w orkforce. • Records of drinking - water supply, replenishment, and daily verification shall be maintained as part of the Heat Stress Management Plan implementation records. Daily Pre - Start Verification: Before workers commence their shift, the responsible supe rvisor shall verify that drinking water is available in sufficient quantity, properly stored, cooled where practicable, and accessible at designated work and welfare areas. Any shortage shall be rectified before work starts. 5.3 Protection of Employees fro m Hot Climate Hot climate is an inherent nature of the kingdom’s environment, because its summer season stretches approximately from April to October of each year. Hot summer months pose adverse conditions for outdoor or field workers who must protect themselves against heat, sun exposure, and other hazards, thereby the threat of Heat Stress. o Employees shall be oriented and instructed on the potential hazards in their workplaces and how to manage them. o ABYATONA shall ensure that its employees are protected from the adverse effects of working in hot climate and environment. o Project management shall be proactive with SAG advice for prescribed cut - off for working hours, with the aim of limiting the length of exposure to hot work environm ent of project field personnel. 5.4 Work Environment Provisions for Hot Climate Project management shall ensure that sufficient resting shades are provided to its workers during hot climate. Supervisors shall be advised as to the appropriate rotation of workers for rest periods in order to limit the heat exposure of the workers. • Resting shades shall be made of scaffold tubes and components with provisions of timbers for seats and roofing, the structure to be covered by filter screen/net. • The resting shades may be designed to be transferable from area to area, with other structures made for areas with personnel staying for longer periods. These shades shall be made ready prior to personnel starting work on - site during hot weather conditions. • These resting shades shall be strategically positioned where practicable, and by nearest Weather Working and Heat Stress Management Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 10 proximity possible to a specified work group who are exposed to hot weather conditions for a period longer than 4 hours in order to provide rotational breaks and cooli ng rest periods. o Sufficient cool drinking water shall become the main provision of ABYATONA to its employees. Drinking water shall be set - up as necessary, and provided with disposable drinking paper cups. o A designated group from project operations shall be tasked to monitor and facilitate the provision of cool drinking water to all project field personnel. o When ventilation cannot be availed from natural breeze due to dust and other factors, mechanical ventilators may be provided as practicable. A generator set may be employed as practicable if utility power service is inaccessible. 5.5 Information of Daily Weather Advisory • The weather advisory shall be included in the daily briefing to be made by the field superintendent or supervisor. • The field foreman shall take action to prepare against any advice of hot weather conditions. • The details of obtaining information regarding weather conditions in can be obtained from Weather Forecast, Saudi Arabia https ://www.worldweatheronline.com 5.6 Hot Climate Work Time and Regulations ABYATONA will follow Kingdom regulations or directive for work time duty cut - offs, during summer time to the suggested work hours may be e.g. 6:00 am to 10:00 am = 1 st work period and 3:00 pm to 7:00 pm = 2 nd work period. Ministerial Decree amending the working hours under the direct sun, this resolution shall come into force as of June 15 up to September 15 of each Gregorian Year. This resolution is considered as an integral part of the Ministerial Decree No. (1/1559) dated 22/06/1431H (05/06/2010G). Workers are not allowed to work under the direct Sun from 12:00 afternoon to 03:00 afternoon during the period between June 15 to September 15 of each calendar year. 5.7 Work Environment Temperature Monitoring A Pocket Weather Meter shall be employed by the project to measure the heat index of worksites. Sampling measurements shall be performed by roving safety personnel upon advice of a high temperature workday, the results of which shall be communicated to the work foreman and to the immediate work group, especially when readings indicate bordering and within the alert zones. The measurements shall be recorded and kept on the “Weather Monitoring Logbook” file as proof of environmenta l monitoring. 5.8 Reporting Heat Stress Incidents All heat - related incidents, illnesses, near misses, and dangerous occurrences shall be reported immediately to the ABYATONA Project Management Team and communicated to ERC/PMC in accordance with the approv ed ERC Incident Notification, Investigation and Reporting Procedure. The HSE Department shall ensure prompt notification, investigation, root cause analysis, implementation of corrective and preventive actions, and submission of all required reports within the contractual reporting timeframes. Lessons learned shall be communicated to the workforce through toolbox talks, safety alerts, and management reviews to prevent recurrence. Weather Working and Heat Stress Mgt. Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 5.9 Factors and Conditions Environmental Heat and Metabolic Heat Workers typically are expose to two forms of heat stress: • Environmental heat from the air temperature, sun exposure, hot process equipment, humid and other working conditions. • Internal metabolic heat from physical exertion. When we discuss heat stress, we are really discussing a combination of contribution from both environmental and metabolic heat stresses. Wind, Humidly, Sun Measuring just air temperature provides limited usefulness. Additional information about humid, wind speed, exposure to full effects of the sun, working close to hot objects, the breathability of work clothing, and the physical exertion needed to do th e task provide a much more accurate picture of the level of heat stress. COLLING Perspiration (sweating) is the body’s mechanism for cooling down. Without adequate hydration, the body will not sweat, and heat related illnesses become far more likely. Note: Drinking water frequently is the best defenses against heat stress. • Once consumed, it takes the body about an hour to absorb and begin using 1 liter of water. For this reason, it is better to drink small amounts of water several times an hour rather than drink larger amounts more infrequently. About one cup (250 milliliters) every 15 minutes will assure that the body always has a supply of water to use. • If the body is not fully hydrated right at the start of the day, once work starts, the body may be constantly trying to recover but can’t fully until it has absorbed enough water. It may take hours for the proper balance between work, perspiration and hydration to be achieved. • You cannot rely on thirst. By the time you “feel’ thirsty, your body is likely already significantly dehydrated. You won’t feel thirsty until your body is out of water. And, since it takes an hour or more for your body to absorb enough water to get back in balance, waiting until you get thirsty is a very poor strategy. ACCLIMA TIZATION The second - best defense against heat stress is acclimatization. It takes a week or two to become acclimatized. Those who leave the project for a week and go to cooler climates, they will lose their acclimatization in about a week. Note: No one is acclimatized during the first few days of a heat wave. UN - ACCLIMATIZED WORKERS Slowly introduce UN - acclimatized workers to hot working conditions. On the first day, start with about 20% of the normal work (metabolic) demand. Add another 20% each day until you reach the expected work demands in about a week. AIR MOVEMENT Increasing air movement (using fans) is a good work control if air temperature is less than skin temperature (35 °C). When air temperature is higher than skin temperature, the increased air movement tends to add to heat stress. A good rule of thumb is a little air movement is almost always a good thing. But as it gets hotter, move the air more slowly; use fewer fans or less powerful fans or do not point the fans directly at the workers. CLOTHING Whenever safely possible, wear work clothes made of a single layer of cotton or other highly breathable fabrics. Light colors are better than dark colors. The free movement of cool, dry air over the skin’s surface maximizes body heat removal. Evaporation of sweat from the skin is Weather Working and Heat Stress Mgt. Plan ABD - 0062 - HSW - PLN - 00006_05 Page | the best heat removal mechanism. Impermeable, thermally insulating as well as encapsulating clothing or PPE severely restrict heat removal and can produce excessive heat strain even when ambient conditions are considered cool. 6. WORKING IN HEAT Develop a risk assessment to identify high temperature working environments and implement effective control measures to reduce exposure and protect employees from heat related injuries or ill health. ABD will implement worksite specific heat stress program with the following elements: • Acclimatization program for new employees, employees that have been on vacation, and emplo yees that are moving from a worksite that has climate control to a worksite that has high temperatures with an allowance of 5 - 7 days for acclimatization before starting hard work in a hot environment. • Process for assessing environmental conditions utilizing the Thermal Work Limit (TWL) to determine work/rest breaks and water consumption requirements for employees (see Thermal Work Limit Table). • System to communicate current environmental conditions to employees so they can take appropriate control measures to prevent heat stress injuries and illnesses. • Communication system to inform/remind employees, employees returning from vacation and visitors to the site of the hazards of heat stress, signs and symptoms of heat stress, and steps to be taken to p revent heat stress. • Requirements for provision of appropriate amounts of potable drinking water close to the worksite and appropriate electrolyte replacement drinks, as per guidance from a qualified physician, for employees working in high temperature environments and implement programmed drinking where appropriate every hour to encourage appropriate fluid intake. • Provision of appropriate clothing (e.g., lightweight, cotton, light - colored, loose - fitting unless using machinery) and personal protective equipment including a large personal water container (of at least one liter in size). Shared drinking cups, water bottles, or other such devices are not allowed. • Provision for design and placement of shade and cooling shelters for employees working outside during the summer months and appropriate cooled accommodation / shelter for the summer months during the midday break period. • Process of scheduling physical activities in the summer months where possible to the coolest part of the day. • Provision of pre - employment screening for any employee working in high temperature environments to identify and chronic medical condition (e.g., high blood pressure, obesity) or use of prescription drugs which may affect their resistance to heat stress. • Pre - job trainin g (inductions) prior to working in high temperature environments and a permit to work system in extreme high temperature and humidity environments that includes the TWL High Risk Zone. • Audit/inspection program to ensure worksites are following the heat str ess program requirements. • Training for all employees. Weather Working and Heat Stress Mgt. Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 13 • Investigation and reporting of heat injuries and illnesses. • Where possible, engineering control measures must be used to eliminate or reduce the heat Exposure. • Control measures may include: o Providing shaded work areas. o Adding insulation to building ceilings to minimize solar heat transfer. o Providing cooled and air - conditioned rest areas with water or electrolyte drinks. o Using exhaust ventilation such as fans to increase airflow across the skin and increase evaporation and cooling. o Using cooled air from and air - conditioning system to cool work areas. • Work is planned so that an appropriate number of employees are acclimatized and prepared to work in a hot temperature environment. • Employees must not work along in heat stress areas. • Appropriate cools fluids must be available and accessible to maintain appropriate hydration during period of high temperature. If reliable containers (e.g., water coolers) are used, the seal must be taped with the date the container was filled written on the tape. Refillable containers must be cleaned and refilled daily and containers without a taped and dated seal must not be used for rehydration of employees. THERMAL WORK LIMIT CHART (TWL) Weather Working and Heat Stress Mgt. Plan ABD - 0062 - HSW - PLN - 00006_05 Page | 14 6.1 MEDICAL SURVEILLANCE AND FITNESS FOR WORK PROGRAM In accordance with the Expo Riyadh Construction Safety Manual (ERCSM) Section 1 3 .15 – Working in the Heat and the Fitness for Work and Medical Surveillance requirements, ABYATONA shall implement a comprehensive Medical Surveillance Program to ensure that all personnel assigned to heat - exposed activities are medically fit to perform their duties safely The Medical Surveillance Program shall be managed by the Occupational Health Physician in coordination with the Project HSE Manager and Human Resources Department and shall include the following requirements: PRE - EMPLOYMENT MEDICAL SCREENING Prior to mobilization, all employees assigned to outdoor work or other heat - exposed activities shall undergo a pre - employment medical examination to determine their fitness for work under high ambient temperature conditions. The medical assessment shall include scr eening for conditions that may reduce heat tolerance, including but not limited to: • Hypertension and cardiovascular diseases. • Obesity or elevated Body Mass Index (BMI). • Diabetes mellitus. • Chronic kidney disease or dehydration susceptibility. Respiratory disorders. • Previous history of heat exhaustion or heat stroke. • Use of prescription or over - the - counter medications that may impair thermoregulation, hydration status, or cardiovascular function. • Any other medical condition identified by the Occupational Health Physician as increasing susceptibility to heat - related illness. PERIODIC MEDICAL EXAMINATION Periodic medical examinations shall be conducted throughout the project duration based on occupational health requirements, risk assessment findings, and physician recommendations to confirm continued fitness for work in hot environments. Additional medical reviews shall be undertaken following: • Extended medical leave. • Heat - related illness or hospitalization. • Significant changes in health condition. • Physician recommendation or management referral. FITNESS - FOR - WORK CLASSIFICATION Following medical evaluation, personnel shall be classified as: • Fit for unrest