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The most significant risk associated with petroleum fuels is <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 /> photoionazation detector ( PID ) calibrated to the benzene molecule <br /> with isobutylene gas The Safety Coordinator;Project Marager <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 wi11 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 /> g presented in Appendix I is additional hazard information on these <br /> compounds. <br /> Table i <br /> r Hazard Exposure Guidelines <br /> Substances Cal OSHA 1989-90 ACGIH <br /> PEL TLV <br /> g Banzene ---- µ- 10ppm (TWA) 10 ppm (TWA) <br /> 25 ppm (Ceiling) <br /> Toluene 100 ppm (TWA) 100 ppm ( TWA) <br /> 150 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 ppm (TWA) <br /> 150 ppm (STEL) 150 ppm ( STEL ) <br /> is <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 />