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evaluation of subsurface data indicates the presence of elevated <br /> levels of petroleum hydrocarbons . <br /> 3 .4 EXPOSURE PREVENTION AND SAFETY REQUIREMENTS <br /> This section describes the hazard and danger of exposure to <br /> chemicals and physical hazards present at the site . Possible <br /> contingency plans and safety requirements are also presented on <br /> this section. <br /> 3 .4 . 1 HAZARD EXPOSURE GUIDELINES <br /> Substances CAL OSHA 1990-91 ZSVHOJ/ <br /> PEL TLV <br /> - ---------------- - - ------ ------------ - ---------------------- - <br /> Benzene 1 ppm (TWA) 1 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 /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> 500 ppm (STEL) 500 ppm (STEL) <br /> Oil Mist 5 mg/m3 (TWA) 5 mg/m3 (TWA) <br /> 10 mg/m3 (STEL) 10 mg/m3 (STEL) <br /> Petroleum 400 ppm (TWA) 400 ppm (TWA) <br /> Distillates <br /> 3 .4 .2 DIESEL & GASOLINE FUEL HAZARDS <br /> A. Eye and skin exposure hazards : irritant <br /> In case of exposure : <br /> Remove contaminated clothing and shoes; <br /> - Flush affected areas with plenty of water for a minimum <br /> of 15 minutes; <br /> - IF IN EYE, hold eyelids open and flush with plenty of <br /> water for a minimum of 15 minutes; <br /> 6 <br />