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3.3 HEAT STRESS <br />Adverse climatic conditions (both heat and cold) are important considerations in planning and conducting site <br />operations. Ambient temperature effects can include physical discomfort, reduced efficiency, personal injury <br />and increased accident probability. <br />Heat stress is of particular concern due to the prevailing climactic conditions in California. All appropriate <br />procedures regarding heat stress shall be met. Additionally, one or more of the following control measures <br />can be used to help control heat stress: <br />1. Provisions of adequate liquids to replace lost body fluids. Employees must replace water <br />and salt lost from sweating. Employees must be encouraged to drink more than the <br />amount required to satisfy thirst. Thirst satisfaction is not an accurate indicator of <br />adequate salt and fluid replacement. (It is important to note, however, that ingestion of <br />liquids will not be permitted in the contaminated zone. Workers should go to the break <br />room to obtain the necessary liquids.) <br />2. Establishment of a work regimen that will provide adequate rest periods for cooling down. <br />This may require additional shifts or workers. <br />3. Cooling devices such as cooling vests can be worn beneath protective garments. <br />4. All breaks are to be taken in a cool, shaded area (77 degrees Fahrenheit is ideal). <br />Indications of heat stress include: <br />Sweating <br />Pale moist skin <br />Complaints of dizziness <br />Pain or muscle spasm <br />Personnel monitoring is recommended above 80 degrees Fahrenheit (i.e., heart rate, oral temperature, body <br />weight loss, blood pressure etc.). Use NIOSH guidelines for monitoring intervals. <br />The following climatic conditions may warrant site closure: <br />Electrical storms <br />Wind velocity above 15 miles per hour if dust control is not feasible <br />Excessive heat <br />