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Work -Rest Regimes ab <br />Maximum Adjustedc Temperature, F <br />Work -Rest (per hour) <br />Light Work <br />Moderate Work <br />Heavy Work <br />Continuous <br />86 <br />80 <br />77 <br />75 percent work - 25 percent rest <br />87 <br />82 <br />79 <br />50 percent work - 50 percent rest <br />89 <br />85 <br />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 />4.3 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 />4.3.1 Potential Site Contaminants and Methods of Monitorin <br />Based on the histor- , of diesel 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 />toluene, ethylbenzene, and xylene through particulates. Monitoring procedures for particulates <br />will include 1) personal air sampling and 2) visible monitoring for dust. <br />8 <br />