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Sunburn. Working outdoors on sunny days for extended periods of time can cause sunburn too <br />the skin. Excessive exposure to sunlight is associated with the development of skin cancer. Field <br />staff should take precautions to prevent sunburn by using sun -screen lotion and/or wearing hats <br />and long-sleeved garment. <br />Heat Stress. The potential for heat stress is a concern when field activities are performed on <br />warm, sunny days, and is accentuated when chemical protective clothing is worn. Heat stress <br />prevention measures and monitoring will be implemented if site temperatures are above 70 <br />degrees Fahrenheit (F). <br />Precautions to prevent heat stress will include work/rest cycles so that rest periods are taken <br />before excessive fatigue occurs, and regular intake of water to replace that lost from sweating. <br />Work/rest cycles will be based on monitoring the heart rate (pulse) of each individual worker. <br />Rest breaks will be long enough to reduce the heart rate (HR) below levels calculated according <br />to the following methods. <br />1. The worker will initially determine their resting HR prior starting work activities. <br />2. At the start of the first rest period the worker will determine their HR> This initial HR <br />should not exceed the individual's age-adjusted maximum HR, which equals [(0.7)(220 - <br />age in years)]. At 1 minute into the rest period, the recovery HR will be determined. The <br />recovery Hr should not exceed 110 beats per minute. <br />3. If the initial HR exceeds the age-adjusted maximum HR, or the 1 -minute recovery HR is <br />greater than 110 beats per minute, then the next work period will be decreased by 10 <br />minutes. - <br />Heat stress due to water loss can be prevented. To prevent dehydration, water must approximate <br />sweat loss. Water intake guidelines are as follows: <br />1. The sense of thirst is not an adequate regulator of water replacement needs during heat <br />exposure. Therefore, water must be replaced at 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 glasses of water. <br />2. Plain water, served cool, is excellent. An adequate supply of potable water and drinking <br />cups will be readily available, such as in a support vehicle, to provide water during rest <br />periods. <br />3. Adding salt to water is not recommended. However, other fluids, in addition to water, <br />could include dilute fruit juices and electrolyte replacement drinks diluted 3:1 with water. <br />Do = use salt tablets! <br />