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A=COM contribution to heat stress. Because WBGT is only an index of the environment, the contributions of work demands, clothing, and state of acclimatization shall also be accounted for, as described in the following steps. • Monitor ambient temperatures and conduct heat stress monitoring in accordance with the location specific SH&E Plan. Revise the heat stress monitoring and controls if there are any reports of discomfort due to heat stress. • Monitor temperatures in each unique environment in which workers perform work(e.g., take WBGT measurements inside truck cabs for truck drivers, and take separate WBGT measurements in the outdoor area where field employees work, etc.). Follow manufacturer's instructions on proper use of the WBGT. • Determine if individual workers are acclimatized or un-acclimatized. Full heat acclimatization requires up to 3 weeks of continued physical activity under heat-stress conditions similar to those anticipated for the work. Its loss begins when the activity under those heat-stress conditions is discontinued, or when there is a sustained increase in temperatures of 10 IF (5.6°C)or more, and a noticeable loss occurs after 4 days. A worker can be considered acclimatized for the purpose of this procedure when they have been exposed to the site conditions(including level of activity)for 5 of the last 7 days. • Determine the approximate workload of each worker or group of workers. The following examples (Table 1)can be used for comparison: Table 1 Examples of Activities within Workload Categories Categories Example Activities Resting Sitting quietly Sitting with moderate arm movements Sitting with moderate arm and leg movements Standing with light work at machine or bench while using mostly arms Light Using a table saw Standing with light or moderate work at machine or bench and some walking about Scrubbing in a standing position Moderate Walking about with moderate lifting or pushing Walking on level at 3.5 miles/hr(6 km/hr)while carrying 6.6 Ibs (3kg)weight load Carpenter sawing by hand Heavy Shoveling dry sand Heavy assembly work on a non-continuous basis Intermittent heavy lifting with pushing or pulling (e.g., pick-and-shovel work) Very Heavy Shoveling wet sand • Determine the approximate proportion of work within an hour during a typical shift. Typically, the initial work schedule will be 60 minutes of work per hour(100 percent work)with a small break in the morning and afternoon, as appropriate, and a 30-minute lunch break mid-day. • For workers wearing cloth coveralls(e.g., Nomex fire resistant clothing), add 3 to the measured WBGT. For impermeable clothing, such as Tyvek or Saranex,the WBGT procedures cannot be used. For these situations,workers should begin physiological monitoring as soon as the temperature in the work area exceeds 70°F (21°C). • Use the collected information to develop appropriate work to rest schedules as detailed in S3AM-113-ATT1 Heat Stress— Temperature Threshold.Work-rest schedules and water provision shall be documented in the applicable SH&E Plan or supplementary Health Illness Prevention Plan and may be additionally documented using logs such as S3AM-113-FM2 Daily Heat Illness Prevention Log. Heat Stress(S3AM-113-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED.CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 5 of 10