Laserfiche WebLink
�r <br /> I <br /> r . <br /> ON- <br /> sampling may also pose a fire and explosion hazard from gases and <br /> vapors trapped beneath the ground surface. <br /> The most significiant 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. The Safely <br /> Coordinator/Project Manager will establish an exclusion zone <br /> encompassing a 50 foot radius from the work area. Access within <br /> this zone will be limited to required personnel. Total organic <br /> vapors will be monitored within the exclusion zone using a <br /> photoionization detector (PID) calibrated for benzene the most <br /> toxic of the aromatic hydrocarbons. Current enforceable and <br /> recommended exposure limitations for potential site contaminants <br /> are; presented in Table 1. Also presented in Appendix I is <br /> additional hazard information on these compounds. <br /> Table 1 <br /> Hazard Exposure Guidelines <br /> SuJastances Cal OSHA 1985-89 ACGIH <br /> PEL 'TLV <br /> ------------------------------------------------------------ <br /> Benzene 10 ppm (TWA) 10 ppm (TWA) <br /> 25 ppm (EXC) 25 ppm (STEL) <br /> 50 ppm (Ceiling) <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> Xylene 100 ppm (TWA) 100 ppm (TWA) <br /> 150 ppm (STEL) <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> 500 ppm (STEL) <br /> * Possible contaminants that could be encountered as <br /> presently known. <br />