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Workers will be trained on the signs and symptoms of the forms of heat <br /> stress and will be encouraged to monitor themselves and others. Self- <br /> monitoring for physiological signs of heat stress should be adequate for <br /> activities at the site. If any concerns regarding heat stress arise during site <br /> activities, the pace of work should slow or stop and the ERM DIHS must <br /> be contacted immediately for consultation. In addition, experience has <br /> shown that the following work/rest regimen is appropriate for field <br /> workers performing various degrees of work while wearing Level D (no <br /> protective clothing). All values are given in °C Wet Bulb Globe <br /> Temperature (WBGT): <br /> Work Load <br /> Work/Rest Regimen Light Moderate Heavy <br /> Continuous Work 30.0 26.7 25.0 <br /> 75% work/25% 30.6 28.0 25.9 <br /> rest each hour <br /> 50% work/50% 31.4 29.4 27.9 <br /> rest each hour <br /> 205% work/75% 32.2 31.1 30.0 <br /> rest each hour <br /> WBGT is defined according to the following formula (outdoors with solar <br /> load) where WB, GT, and DB are the wet bulb, globe, and dry bulb <br /> temperatures, respectively: <br /> WBGT = 0.7WB + 0.2GT + 0.1DB <br /> The workload classes are defined in The American Conference of <br /> Governmental Industrial Hygienists booklet, "Threshold Limit Values and <br /> Biological Exposure Indices for 1997." <br /> 4-7 <br />