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The mostsignificant risk associated with p petroleum fuels is <br />exposuresto 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 photoion- <br />ization detector (PID) calibrated to the benzene molecule with <br />isobutylene gas . The Safety Coordinator/Project Manager will <br />establish an exclusion zone encompassing a conservative 50 foot <br />radius from the work area. Limits of the exclusion zones may be <br />modified based on field measurements taken during the course of <br />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 />Table 1 <br />Hazard Exposure Guidelines * <br />Substances <br />Cal OSHA <br />1989-90 <br />ACGIH <br />------------------------------------------------------------ <br />PEL <br />TLV <br />Benzene <br />10 <br />ppm <br />(,TWA) <br />10 <br />ppm <br />(TWA) <br />25 <br />ppm <br />(Ceiling) <br />Toluene <br />100 <br />ppm <br />(TWA) <br />100 <br />ppm <br />(TWA) <br />150 <br />ppm <br />(STEL) <br />150 <br />ppm <br />(STEL) <br />Ethylbenzene <br />100 <br />ppm <br />(.TWA) <br />100 <br />ppm <br />(TWA) <br />125 <br />ppm <br />(STEL) <br />125 <br />ppm <br />(STEL) <br />Xylene <br />100 <br />ppm <br />(TWA) <br />100 <br />ppm <br />(TWA) <br />150.ppm <br />('STEL) <br />150 <br />ppm <br />(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 />