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A=COM 4.3 Exposure Controls 4.3.1 It shall be determined whether Employees are or may be exposed to hazardous heat levels. The Supervisor shall: • Conduct a heat stress assessment to determine the potential for hazardous exposure of Employees.Assessment shall include, but not limited to: o Ambient temperature. o Amount of sunshine (cloudy, clear). Refer to S3AM-121-PR1 Non-Ionizing Radiation additional direction concerning ultraviolet radiation exposures. o Other radiant heat sources(e.g. motor,fire, etc.). o Humidity. o Air flow. o Amount or type of physical labor being performed, o Physical condition of the Employees(e.g., acclimated/not) o Protective clothing in use. o Referral to S3AM-113-ATT1 Heat Stress— Temperature Thresholds to assist in determining whether hazardous heat exposures may exist. • If potential for hazardous exposure is identified,the Supervisor shall develop and implement a heat stress exposure control plan within the Safe Work Plan and/or Task Hazard Analysis. Refer to S3AM-209-PR1 Risk Assessment&Management. 4.3.2 If Employees are or may be exposed, the Supervisor shall implement engineering controls(e.g., shelters, cooling devises, etc.)to reduce the exposure of Employees to levels below those specified for the given work level and work-rest regimen as listed in S3AM-113-ATT1 Heat Stress— Temperature Thresholds. 4.3.3 If engineering controls are not practicable, the Supervisor shall reduce the exposure of Employees to levels below those listed in S3AM-113-ATT1 Heat Stress— Temperature Thresholds by providing administrative controls, including a work-rest cycle or personal protective equipment, if the equipment provides protection equally effective as administrative controls. 4.3.4 If Employees are or may be exposed, the Supervisor shall provide and maintain an adequate supply of cool,fresh, potable water close to the work area for the use of a heat exposed Employee. Water shall be provided (paid) by the project or program; if Employees purchase their own drinking water because water is not otherwise available on site,they shall be reimbursed. 4.3.5 If an Employee shows signs or reports symptoms of heat stress or strain,they shall be removed from the hot environment and treated by an appropriate first aid attendant on site, if available, or by a physician, refer to S3AM-113-ATT2 Heat Stress—Symptoms& Treatment for more specifics. 4.4 Heat Stress Planning 4.4.1 Heat stress can be a significant site hazard, especially for Employees wearing CPC. To prepare for emergency response planning, refer to S3AM-010-PR1 Emergency Response Planning procedure. 4.4.2 The project and site-specific heat related risks shall be identified.Appropriate prevention and control measures shall be developed and documented in the project's SH&E Plan or included as a supplement to the SH&E Plan (e.g., S4(DCSJAM-113-FM1 Heat Illness Prevention Plan—DCS Americas)and the Task Hazard Assessments (THA). Refer to the S3AM-209-PR1 Risk Assessment&Management procedure. 4.4.3 The heat a worker is exposed to may be a combination of air temperature, radiant heat, and humidity. The WBGT(wet-bulb globe thermometer)is a useful index of the environmental Heat Stress(S3AM-113-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED.CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 4 of 10