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from the source,-,,shielding can-be•used to interrupt the path between the source and the worker. <br /> Polished surfaces make the best barriers, although special glass or metal mesh surfaces can be used I� <br /> if visibility is a problem. <br /> O <br /> I <br /> Shields should be located so that they do not interfere with airflow, unless they are also being used t <br /> reduce convective heating. The reflective surface of the shield should be kept clean to maintain its , a <br /> effectiveness. M: <br /> ADMINISTRATIVE CONTROLS/SAFE WORK-PRACTICES ' <br /> Training is the key to good work practices. Unless all employees understand-the reasons for using j <br /> new, or changing old, work practices, the chances of such a program succeeding are greatly reduced. F <br /> NIOSH (1986) states that a good. heat stress training program .should include least the following <br /> components: , <br /> + <br /> Knowledge of the hazards of heat stress; <br /> g ,.. I <br /> • Recognition of predisposing'factors; danger signs, and symptoms; j <br /> potential health effects of <br /> Awareness of first-aid procedures for, and the i' , heat stroke and heat <br /> exhaustion; w <br /> Employee responsibilities in avoiding heat-stress; <br /> • Dangers of using drugs, including therapeutic ones, and alcohol in hot work environments; I� <br /> 4 f <br /> Use of protective clothing and equipment; and <br /> Purpose and coverage of environmental and medical surveillance programs and the . <br /> advantages of worker participation programs. y <br /> Hot jobs should be scheduled for the cooler part of the day, and routine maintenance and repair work <br /> in hot areas should be scheduled for the cooler seasons of the year. , <br /> Measurement is often required of those environmental factors that most nearly correlate with deep r <br /> body temperature and other physiological responses to heat. At the present time, the Wet Bulb Globe <br /> Temperature Index (WBGT) is the most used technique to measure these environmental factors. <br /> WBGT values are calculated by the following equations: <br /> WET BULB GLOBE TEMPERATURE INDEXES (WBGI) <br /> Indoor or.outdoors with no solar load i I <br /> r WBGT= 0.7NWB+ 0.3GT _ <br /> Outdoors with solar load T <br /> WBGT= 0.7NWB+ 0.2GT+ Q 1 D <br /> t �Where: WBGT =Wet Bulb Globe Temperature Index <br /> STANTEC Consulting Corporation <br /> Attachment 8 <br /> i � <br />