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OFadj =OFambient+(13 x %sunlight) <br /> Work-Rest Regimes a,b <br /> Maximum Adjusted° Temperature, F <br /> Work-Rest (oer hour) Light Work Moderate Work Heavv Work <br /> Continuous 86 80 77 <br /> 75 percent work - 25 percent rest 87 82 79 <br /> 50 percent work - 50 percent rest 89 85 82 <br /> 25 percent work- 75 percent rest 90 88 86 <br /> a=Based on permeable clothes <br /> b =Adapted from ACGIH 1989 <br /> c=Adapted from NIOSH et. al. 1985 <br /> 3.3 CHEMICAL HAZARDS <br /> Chemical hazards arise from excessive airborne concentrations of mists, vapors, gases or <br /> solids in the form of dust or fumes. In addition to the hazard of inhalation, many of these <br /> materials may act as skin irritants and/or may be toxic by absorption through the skin. The <br /> typical chemical hazards present on the site and the methods to prevent illness/injury due to these <br /> hazards are described below. <br /> 3.3.1 Potential Site Contaminants and Methods of Monitorine <br /> Based on the history of heating fuel storage in the USTs, a majority of the work to be <br /> performed under this contract involves the potential for contact with petroleum hydrocarbons. <br /> The potential chemicals of concern (COCs) at this site are benzene, toluene, ethylbenzene, and <br /> xylene. The primary health risk at the site is the potential for human exposure to benzene, <br /> 8 <br />