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IV <br /> DB-Dry Bulb <br /> WC-Weather conditions: Add 1 °F if the work is being performed in full <br /> sun, add 7°F if the work is being performed in partial sun to overcast <br /> conditions, make no adjustment if the work is done in the shade or at <br /> night. <br /> RH-Relative humidity: use the following scale to adjust humidity <br /> 10%...............................subtract 8°F <br /> 20%...............................subtract 4°F <br /> 30%................................. no change <br /> 40%......................................add 3°F <br /> 50%......................................add 6°F <br /> 60%......................................add 9°F <br /> 3. The multi-agency "Occupational Safety and Health Guidance Manual for Hazardous <br /> Waste Site Activities" (4-Agency Manual, 1985) <br /> The Manual recommends the use of the current ACGIH guidelines for workers wearing <br /> permeable clothing (e.g., standard work clothing), but provides additional guidance for <br /> employees wearing impermeable clothing. According to this document, employees <br /> wearing impermeable clothing should be monitored when the work area temperature <br /> exceeds 70°F. This document also provides a chart identifying the frequency with which <br /> employees should be monitored. Work periods are governed by the frequency of <br /> monitoring] <br /> 8.2 Heat Stress Management <br /> Work practices and exposure controls are used to reduce the risk of elevating an <br /> employee's core body temperature. These work practices and exposure controls <br /> include the following: <br /> • defining and adjusting employee work/rest intervals <br /> • monitoring for physiological signs of heat stress <br /> • providing cool liquids <br /> • establishing and implementing acclimatization schedules <br /> • using warm weather cooling garments <br /> Employee Work/Rest Intervals <br /> Work/rest intervals are based on PPE, employee work loads, environmental conditions <br /> (temperature, humidity, air movement), and the results of physiological monitoring. <br /> Work/rest intervals are determined and communicated by Patrick Riggs. Work/rest <br /> intervals are adjusted throughout the work shift as needed and communicated to each <br /> employee at the conclusion of an applicable rest period, prior to reentry into the work <br /> zone. Guidelines for work/rest schedules for this site are provided in Table 8-2b. <br /> Chapter 8 - 2 <br />