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nnovative onstruction olutions Sunstroke , h ramp. 0 minuf 105 ° F - 30 F exhaustion like y , and heat stroke if signs of heat stress ar ( 41 ° C - 540C ) possible with prolonged exposure observed . and /or physical activity e . I u es or" sbo ' e 1307 or Higher Heat/Sunstroke highly likely with if signs of heat stress areIL igher ) exposure , observed . Source : National Weather Service Physiological Monitoring and Associated Actions When physiological monitoring is required , the following will be performed : • The heart rate should be measured by the radial pulse for 30 seconds, as early as possible in the resting period . • The heart rate after one - minute rest period should not exceed 120 beats per minute ( bpm ) . • If the heart rate is higher, the next work period should be shortened by 33 percent, while the length of the rest period stays the same . • If the pulse rate still exceeds 120 bpm at the beginning of the next rest period , the following work cycle should be further shortened by 33 percent . • Continue this procedure until the rate is maintained below 120 bpm , or 20 bpm above resting pulse . • Alternately, the body temperature can be measured , either oral or aural ( ear ) , before the workers have something to drink . • If the oral or aural temperature exceeds 99 . 6 ° F ( 37 . 6 ° C ) at the beginning of the rest period , the following work cycle should be shortened by 33 percent . • Continue this procedure until the oral or aural ( ear ) temperature is maintained below 99 . 6 ° F ( 37 . 6 ° Q . While an accurate indication of heat stress, oral temperature is difficult to measure in the field , however, a digital aural ( aural ) thermometer is easy to obtain and inexpensive to purchase . Water Water is a key preventive measure to minimize the risk of heat related illnesses, employees shall have access to potable drinking water meeting the requirements . Where the supply of water is not plumbed or otherwise continuously supplied , water shall be provided in sufficient quantity at the beginning of the work shift to provide one quart per employee per hour for drinking for the entire shift . Employers may begin the shift with smaller quantities of water if they have effective procedures for replenishment during the shift as needed to allow employees to drink one quart or more per hour . The frequent drinking of water shall be encouraged . 24