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The following Heat Stress Index(refer to ATC Policy No.23)should be used as a guide to evaluate heat <br /> stress situations. If the Heat Stress exceeds 1050F, contact the RSC prior to work for detailed guidance. <br /> Temp. <br /> Heat Stress Index <br /> Relative Humidit <br /> °F 10% 20% 3006 40% 50% 60% 70% 80% <br /> 105 98 " 90%132 <br /> 102 97 101 <br /> 100 95 99 105 132 <br /> 98 93 97 101 <br /> 96 91 95 98 104 <br /> 94 89 93 95 100 105 <br /> 92 87 90 92 96 100 <br /> 90 85 88 90 92 96 100 <br /> 88 82 86 87 89 93 95 100 <br /> 86 80 84 85 87 90 92 96 100 <br /> 84 78 81 83 85 86 89 _ 91 95 99 <br /> 82 77 79 80 81 84 86 89 91 95 <br /> 80 75 77 78 79 81 83 85 86 <br /> 78 72 75 77 78 79 89 <br /> 76 70 72 75 76 77 77 77 78 79 <br /> 74 68 70 73 74 75 75 75 76 77 <br /> NOTES: Add 10° F when protective clothing is being used; Add 10° F when in direct sunli ht <br /> HSI <br /> Tem Cate o injury Threat <br /> Above Extreme No work unless emergency exists. Contact ATC RSC and Corporate Risk <br /> 130° F Danger Management Department prior to proceeding. Heat cramps or exhaustion likely, <br /> heat stroke 2ossible if ex osure is Prolonged and there is physical activi . <br /> Danger Contact RSC prior to proceeding. Requires strict adherence to ACGIH Heat Stress <br /> Guidelines, including use of on-site WBGT equipment. Heat cramps or exhaustion <br /> 90° to <br /> ( <br /> Extreme Heat cramps or exhaustionllikely, heat stroke possibleis prolonged di�t exposure is prothere is longed and <br /> 105°F Caution there is physical activity. <br /> 80° to Caution Heat cramps or exhaustion likely, heat stroke possible if exposure is prolonged and <br /> 90° F there is physical activity. <br /> Normal Typical conditions for time of year. Little or no danger under normal circumstances. <br /> Range As always, anticipate problems and work safely. <br /> 20160613 Stockton,March Ln 2016 HASP 5-11 <br /> 6/13/16) <br />