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AECOM Heat-Related Illness Prevention Table 1-2 Work-Rest Schedule Based on Adjusted Temperature Adjusted Temperature ff) Work-Rest Frequency Light Work Moderate Work Heavy Work Very Heavy Work No Specified <80 < 75 <70 <65 requirements 15 minute break every 90 80-90 75-85 70-80 65-75 minutes of work 15 minute break every 60 >90-100 >85-95 >80-85 >75-80 minutes of work 15 minute break every 45 > 100-110 >95-100 >85-90 >80-85 minutes of work 15 minute break every 30 > 110-115 > 100-105 >90-95 >85-90 minutes of work 15 minute break every 15 > 115-120 > 105-110 > 95-100 >90-95 minutes of work STOP WORK > 120 > 110 > 100 >95 Evaluating the Work-Rest Schedule's Effectiveness Once a work-rest schedule is established, the SSO must continually evaluate its effectiveness through observation of employees for signs/symptoms of heart stress. Measurement of each employee's pulse can provide additional information in determining if the schedule is adequate, and is accomplished as follows: Within the first minute of each rest period, each employee's heart rate (pulse)can be measured, and compared to the following: • Initial heart rate: 110 bpm (approximately 28 beats every 15 second). Each employee's heat rate must be measured again three minutes later, and compared to the following: • Recovery heart rate: 80 bpm (20 beats every 15 second). • If both heart rate criteria are met, the subsequent work period may be increased by one third, provided the temperature remains constant. • If the initial heart rate is greater than 110 bpm, or the recovery rate is not less than 80 bpm, the subsequent work shift is decreased by one third. If cooling devices (e.g., cooling vest) are worn, only physiological monitoring will be used to determine work activity. Measurements for each employee can be recorded and tracked throughout the work day using the Heat Stress Monitoring Log located in AECOM's SOP S3NA 511_PR_Heat Stress (attached). May 2015 Page 6 of 10