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A=COM • If shade is not available, shaded areas shall be constructed.This same type of canopy can be set up to shade personnel performing various types of work in hot weather. • Cooling measures other than shade(e.g., misting, air-conditioned break areas, air conditioned vehicles, etc.)can be used in lieu of shade provided it can be demonstrated that they are at least as effective in cooling employees. • Employees should have access to these rest areas at break times and at any other time when suffering from heat illness or believing a preventive recovery period is needed. 4.7.5 Dry clothing or towels should be available to minimize chills when taking breaks. 4.7.6 Manual labor will not be performed during breaks, other than paperwork or similar light tasks. 4.7.7 Other controls that may be used include: • Scheduling work at night or during the cooler parts of the day(6 am-10 am, 3 pm-7 pm). • Erecting a cover or partition to shade the work area. • Auxiliary cooling-wearing cooling devices beneath protective garments, but over any underclothing. o If cooling devices are worn, only physiological monitoring will be used to determine work activity. o These vests typically provide cooling via one of two methods: the use of ice or other frozen media, or the use of a vortex cooler. Each method has its advantages and disadvantages. o The frozen media vest requires a means for freezing the media, and the media (usually water or"blue ice")will melt, requiring replacement. o The vortex cooler tends to cool more uniformly. Instead of frozen media, this vest uses the expansion of compressed air to cool the wearer. The drawback is the compressed air requirement, but this is negated when the wearer is already using an airline respirator supplied by a compressor. A vortex cooler should not be supplied from air cylinders, as this will draw down the cylinders rapidly. • Auxiliary cooling should be considered when the following conditions exist: o Ambient temperature over 80°F(26°C). o Workers are wearing impermeable garments(i.e., Tyvek, Saranex, Chemrel, etc.). o It is desirable to have long work shifts with minimum interruption. 4.8 Evaluating the Work-Rest Schedule's Effectiveness 4.8.1 Once a work-rest schedule is established, the Supervisor shall continually evaluate its effectiveness through observation of Employees for signs/symptoms of heat stress. Have workers assess themselves and their body's reaction to the heat and work conditions(self-assessment), and report any signs or symptoms of heat illness. These can include nausea or dizziness, heat cramps, extreme thirst, or very dark urine. 4.8.2 Measurement or physiological monitoring of each Employee's vitals(e.g., pulse, blood pressure, and temperature)can provide additional information in determining if the schedule is adequate. Refer to S3AM-113-ATT1 Heat Stress— Temperature Thresholds for additional guidance on when physiological monitoring should be conducted. 4.8.3 Frequency of physiological monitoring is increased or decreased depending upon such factors as worker fitness, acclimatization,temperature of the work environment, type of PPE, etc. Based on the results of the physiological monitoring and on the workers' self-assessments, the work period may be adjusted as follows: Heat Stress(S3AM-113-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED.CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 8 of 10