Laserfiche WebLink
4.2.3 Heat Stress <br /> The potential for heat stress is a concern when field activities are performed on <br /> warm, sunny days, and is accentuated when personal protective equipment is worn. <br /> Heat stress prevention measures and monitoring will be implemented if site <br /> temperatures are above 70 degrees Fahrenheit. <br /> Precautions to prevent heat stress will include worktrest cycles so that rest periods are <br /> taken before excessive fatigue occurs, and"regular intake of water to replace what is <br /> lost from sweating. Work/rest cycles will be established based on monitoring the <br /> heart rate (pulse) of each individual worker. Rest breaks will be long enough to <br /> reduce the heart rate (HR) below levels calculated according to the following method. <br /> 1. The worker will initially determine their resting HR prior to starting <br /> work activities. <br /> 2. At the start of the first rest period, the worker will determine their HR. <br /> This initial HR should not exceed the individual's age-adjusted <br /> maximum HR, which equals [(0.7)(220 - age in years)]. At 1 minute <br /> into the rest period, the recovery HR will be determined. The recovery <br /> HR should not exceed 110 beats per minute. <br /> 3. If the initial HR exceeds the age-adjusted maximum HR, or the 1- <br /> minute recovery HR is greater than 110 beats per minute, then the next <br /> work period will be decreased by 14 minutes. <br /> Heat stress due to water loss can be prevented To prevent dehydration, water intake <br /> must approximate sweat loss. Water intake guidelines are as follows: <br /> 1. The sense of thirst is not an adequate regulator of water replacement <br /> needs during heat exposure. Therefore, water must be replaced at <br /> prescribed intervals: <br /> a. Before work begins,.drink two 8-ounce glasses of water. <br /> b. During each rest period, drink at least two 8-ounce <br /> glasses of water. <br /> 2. Plain water, served cool, .is excellent. An adequate supply of potable <br /> water and drinking cups will be readily available, such as in a support <br /> vehicle, to provide water during resting periods. <br /> 3. Adding salt to water is not'xecommended. However, other fluids, in <br /> addition to water,;could include dilute fruit juices and;electrolyte <br /> replacement drinks diluted 3:1 with water. Do not use salt tablets? <br /> UNICEASHP <br /> 6.9.94141820001-00 4-2 <br />