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5.2 WORK LIMITATIONS: HOURS Work shall be limited to daylight hours and during normal weather conditions. Extremes in temperature and weather condition(i.e.,wind and lightning)will restrict working hours. HEAT STRESS For monitoring the body's recuperative ability toward excess heat,the following techniques will be used as a screening mechanism. Monitoring of personnel wearing protective clothing will commence when the ambient temperature is 70 degrees Fahrenheit(°F)or above. When temperatures exceed 85T,workers will be monitored after every work period. Monitoring will include visual observations for signs of heat stress and measurement of radial pulse rate for 30 seconds at the beginning of each rest period. If the heart rate exceeds l 10 beats per minute(beats/min)at the beginning of a rest period, the next work period will be shortened by 10 minutes, and the rest period stays the same. If the pulse rate is 100 beats/min at the beginning of the next rest period,the following work cycle will be shortened another 10 minutes. Also,good hygienic standards must be maintained by frequent change of clothing and daily showering. Clothing should be permitted to dry during rest periods. If skin problems occur,consult medical personnel. COLD STRESS The human body"senses"cold as a result of two factors,the air temperature and the wind velocity. Cooling of the flesh increases rapidly as wind velocity goes up. Frostbite can occur at relatively mild temperatures if wind penetrates the body insulation. For example, when the air temperature is 40°F and the wind velocity is 30 miles per hour(mph), the exposed skin would perceive an equivalent still air temperature of 13°F. Table 5-1 illustrates windchill indices and the associated hazards to exposed flesh. Precautions will be taken to minimize exposed flesh, and layered clothing will be provided,as appropriate. Table 5-1. Windchill Index Windspeed Actual Thermometer Reading(°F) (mph) 50 40 30 20 10 0 -10 -20 -30 40 Calm 50 40 30 20 10 0 -10 -20 -30 40 5 48 37 27 16 6 -5 -15 -26 -36 47 10 40 28 16 4 -9 -21 -33 -46 -58 -70 15 36 22 9 -5 -18 -36 -45 -58 -72 -85 20 32 18 4 -10 -25 -39 -53 -67 -82 -96 25 30 16 0 -15 -29 -44 -59 -74 -88 -104 30 28 13 -2 -18 -33 -48 -63 -79 -94 -109 35 27 11 4 -20 -35 -49 -67 -82 -98 -113 40 26 10 -6 -21 -37 -53 -69 -85 -100 -116 Source: National Safety Council, 1982. 5.3 ACCIDENT PREVENTION PLAN/ACCIDENT REPORTING: 10