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Arcadis Heat Illness Prevention Plan (HIPP) <br />HASP Supplement <br />Monitoring of Weather and Heat Index Table Continued <br />Heat Index Action Levels. Below are recommended additional controls. Each level of additional <br />controls is additive as the temperature increases. <br />CAUTION 80° - 90° F (26° - 32° C). Implement one or more of the following measures: Provide <br />and direct hydration, schedule breaks, ensure lightweight clothing is worn, provide break areas <br />with shade / ventilation / air conditioning. <br />EXTREME CAUTION 90° - 105° F (32° - 40.5° C). Implement all the previous and add one or <br />more of the following: Provide light duty PPE, cooled break areas, shaded work areas. <br />NOTE: “Light Duty PPE” includes hard hat sun shades, sun hats, dry or wet evaporative cooling <br />vests, microfiber cooling towels / scarves / headbands / hard hat suspension inserts or <br />sweatbands, hard hat neck shades. <br />NOTE: Warning signs include: When a person’s sustained (e.g., several minutes) heart rate exceeds <br />180 beats per minute (bpm) minus their age (e.g., 180 - age = X) for individuals with normal cardiac <br />performance per their physician; or a body core temperature exceeds 101.3°F / 38.5°C for acclimatized <br />workers or 100°F / 38°C for unacclimated workers; a recovery heart rate at 1 minute after a peak work <br />effort is greater than 120 bpm; or there are symptoms of sudden and severe fatigue, nausea, dizziness, <br />or lightheadedness. <br />DANGER 105 ° - 130 ° F (40.5° - 54.4° C). Implement all the previous and add one or more of <br />the following: cooled work areas, modified work schedule, heavy duty PPE, and personnel <br />physiological monitoring. <br />NOTE: “Heavy Duty PPE” phase-change cooling vests, gel pack or ice pack equipped cooling <br />vests. Consider engineering controls such as forced ventilation. <br />EXTREME DANGER > 130° F (> 54.4° C). If working at this temperature or greater Stop Work until <br />conditions change or hazards are effectively controlled via the items listed above. At this range of <br />temperatures it is critical to implement personnel vital sign monitoring for determining the appropriate <br />frequency and duration of Work / Rest cycles. <br />Work / Rest Cycle Duration and Frequency Process <br />All workers, regardless if they are wearing permeable or impermeable clothing, should be monitored <br />when conditions warrant e.g., when temperatures exceed 80°F / 26.6°C. If impermeable clothing is worn <br />(e.g., not standard cotton/synthetic work clothes), it is a best practice to begin monitoring workers when <br />temps are > 70°F in the work area. Prioritize workers completing strenuous tasks. Prioritization should <br />also apply to work conducted indoors, for strenuous tasks, and/or if additional PPE is worn (such as <br />Level C respiratory protection or(CPC). If impermeable clothing, Level C, or CPC is not worn, follow the <br />Heat Index table instructions and evaluate personnel monitoring as part of the high heat measures. <br />Details provided below for appropriate work/rest cycle development with the default rest cycle being a 15- <br />minute interval for every hour when temperatures exceed 90°F. <br />Rev 8 13 June 2019