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The most significant risk associated with petroleum fuels zs <br /> exposure to aromatic compounds. Skin contact will be eliminated <br /> by use of clothing, eye wear, and gloves and the inhalation <br /> hazard will be minimized using appropriate respiratory protective <br /> devices as determined by on-site air monitoring using a <br /> ' photoionization detector (PID) calibrated to the benzene molecule <br /> with isobutylene gas . The Safety Coordinator/Project Manager <br /> will establish an exclusion zone encompassing a conservative 50 <br /> ' foot radius from the work area. Limits of the exclusion zones may <br /> be modified based on field measurements taken during the course <br /> of investigative activities. Access within this zone will be <br /> ' limited to required personnel. <br /> Current enforceable and recommended exposure limitations for <br /> Potential site contaminants are presented in Table 1. Also <br /> ' Presented in Appendix I is additional hazard information on these <br /> compounds. <br /> 1 <br /> Table 1 <br /> Hazard Exposure Guidelines <br /> ' Substances Cal OSHA 1989-90 ACGIH <br /> ---------------------------PEL__-__---- ------ ---_TLV <br /> __--___ <br /> Benzene 10 ppm (TWA) <br /> 25 ppm (Ceiling) IO ppm (TWA} <br /> Toluene 100 TWA p m <br /> P (TWA) 100 ppm (TWA) <br /> 1.50 ppm (STEL) 150 ppm (STEL) <br /> Ethylbenzene 100 ppm (TWA) 100 ppm (TWA) <br /> ' 125 ppm (STEL) 125 ppm (STEL) <br /> Xylene 100 ppm (TWA) 100 <br /> ' ppm (TWA) <br /> 150 ppm (STEL) 150 <br /> PPM (STEL) <br /> ' Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> 500 ppm (STEL) 500 ppm (STEL) <br /> * Possible contaminants that could be encountered as <br /> presently known. <br />