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HEATICOLD STRESS PROCEDURE ' 1 0 HEAT STRESS ' Heat stress is a significant potential hazard associated with the work task performed and the type and degree of protective equipment used in hot weather environments Local weather conditions may produce condrhons which will require restricted work schedules in order to protect employees Monitoring for heat ' stress will follow one of two protocols depending on whether impermeable clothing (tyvek, saranex, rain gear,etc) or permeable clothing (cotton coveralls) is worn This section will apply to both hazardous and ' non-hazardous waste workers at the site The site safety and health officer (SSHO) with direction from HSS will determine the environmental wet bulb globe temperature (WBGT) and physiological (heart rate [HR] and oral temperature [OR]) monitoring to be conducted for both types of workers 1 1 Workers Wearing Permeable Clothing The American Conference of Governmental Industnal Hygienists (ACGIH) have set TLVs for worker exposure to heat stress in which it is believed that nearly all workers may be repeatedly exposed without ' adverse health effects The TLVs assume that workers are acclimatized, fully clothed in permeable clothing with adequate water and salt intake,and capable of functioning effectively under the given working conditions without exceeding a deep body temperature (BT) of 100 40 Fahrenheit(F) Measurement of the WBGT has been found to be the most adequately measurable environmental factor in which to correlate with the deep BT and other physiological responses to heat The following table reviews the work/rest regimen to be followed by all permeably clothed workers based upon routinely measured WBGT ' Permissible Heat Exposure TLVs Applicable to Workers Wearing Permeable Clothing Workload ' Work/Rest Regimen Light Moderate Heavy Continuous work 86 76 80 70 r82 7 67 ' 75% work-25% rest, each hour 87 77 82 72 68 50% work- 50% rest each hour 89 79 85 75 72 ' 25% work- 75% rest each hour 90 80 88 78 86 76 Values are given in 'F WBGT ' Rest means minimal physical activity Rest should be accomplished in the shade Any activity requiring only minimal activity can be performed during rest period ' 0 Parentheses indicate the 10 degree adjustment for working in impermeable protective clothing 1 2 Workers Wearing Impermeable Clothing ' FLUOR DANIEL GTI r