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n i <br /> FiREMMENNINNEW, i <br /> Work Area Air or PPE level Work Period Rest Period <br /> Adjusted (minutes) (minutes) <br /> Temperature Range <br /> Below 100°F Cease 2 Hours 20 minutes <br /> Activities <br /> Monitoring <br /> Physiological monitoring is conducted to alert employees and their supervisors to <br /> potential heat stress illness. Initial monitoring is conducted and documented at the <br /> beginning of the work shift, prior to entry into the work zone, by Patrick Riggs. <br /> Additional physiological monitoring is performed at the beginning and end of each rest <br /> cycle. Reentry and readjustment of the work/rest cycle are determined based on the <br /> guidelines listed in Table 8-2c. <br /> Type of monitoring Monitoring location Action levels -vital Work/Rest <br /> signs <br /> Modification <br /> Visual, heart pulse rate Throughout Dizziness, excessive Increase frequency as <br /> Excavations sweating needed to minimize <br /> effects. <br /> Both the OSHA's Technical Manual and the "Occupational Safety and Health Guidance <br /> Manual for Hazardous Waste Site Activities" provide guidance on work/rest interval <br /> reassessment based on rest cycle monitoring data. Guidelines in both documents are <br /> essentially the same. Neither the ACGIH (1999) nor the U.S. EPA reference provides <br /> physiological monitoring guidance. <br /> Personal monitoring may include measuring the heart rate, recovery heart rate, oral or <br /> ear canal temperature, or percent water loss. <br /> Heart Rate Measurement: Count the radial pulse for 30 seconds at the beginning of the <br /> rest period. If the heart rate exceeds 110 beats per minute, shorten the next work <br /> period by one third and maintain the same rest period. <br /> Chapter 8 - 3 <br />