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A=COM • The work period may be increased (generally, by 5-to 10-minutes intervals, up to a maximum of 4 hours) if the results of the first 2 hours of the physiological monitoring and the workers' self-assessments indicate that workers are recovering adequately(see below), and on the judgment of the SH&E Manager. • The work period shall be decreased if the results of the physiological monitoring and the workers'self-assessment indicate that workers are NOT recovering adequately(see below). 4.8.4 If physiological monitoring is conducted,the Employee and/or the SH&E Manager(or appropriate designate)shall measure and record body temperature and pulse rate as described below. 4.8.5 Monitor body temperature to determine if Employees are adequately dissipating heat build-up. Ear probe thermometers which are adjusted to oral temperature(aural temperature)are convenient and the preferred method of measurement. Determine work/rest regimen as follows: • Measure oral body temperature at the end of the work period. Oral body temperatures are to be obtained prior to the employee drinking water or other fluids. • If temperature exceeds 99.6°F(37.5°C), shorten the following work period by 1/3 without changing the rest period. • If, at the next rest period,temperature still exceeds 99.6°F (37.5°C), the worker should not be allowed to continue work until repeated temperature measurements are in the acceptable range(i.e., less than 99.6°F). Do not leave the worker alone during the recovery time.Watch for signs of heat illness and be prepared to implement emergency response as necessary. • Do not allow a worker to wear impermeable PPE when his/her oral temperature exceeds 100.E°F (38.1°C). 4.8.6 At the start of the workday each Employee's baseline pulse rate(in beats per minute[bpm]) is determined by taking a pulse count for 15 seconds and multiplying the result by four or by using an automated pulse count device. Pulse rates can then be measured at the beginning of each break period and two minutes thereafter to determine if the rest period allows for adequate recovery. • Take the radial (wrist)pulse as early as possible in the rest period and determine the worker's heart rate in beats per minute. The heart rate is determined by counting the pulse for ten seconds and multiplying the number by 6 to get the beats per minute. Record this as P1. • Wait 2 minutes and repeat the pulse measurement. Record this as P2. • If P1 is greater than or equal to 110 beats per minute(bpm)and if(P1 —P2)is less than or equal to 10 bpm (indicating that workers are not recovering adequately), shorten the next work cycle by 1/3 without changing the rest period. • At the next rest period, if P1 is still equal to or greater than 110 bpm, and if(P1 —P2)is still less than or equal to 10 bpm, shorten the following work cycle by 1/3 without changing the rest period. • At the third rest period, if P1 is still equal to or greater than 110 bpm and (P1 —P2)is still less than or equal to 10 bpm,the worker should not be allowed to continue work until repeated pulse measurements are in the acceptable range(i.e., P1 is less than 110 bpm and (P1 —P2) is greater than 10 bpm). Do not leave the worker alone during the recovery time.Watch for signs of heat illness and be prepared to implement emergency response as necessary. 4.8.7 Use of an automated or similar blood pressure device will be used to assess each Employee's blood pressure at the beginning and end of each break period to determine if the rest period allows adequate cooling by applying the following criteria: • If the blood pressure of an Employee is outside of 90/60 to 150/90,then the Employee will not be allowed to begin or resume work; extend the break period by at least five minutes, at the end of which blood pressure rates will be re-measured and the end-of-break criteria again applied. Heat Stress(S3AM-113-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED.CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 9 of 10