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9 <br /> • • E <br /> 1 1 <br /> I uc JOB HAZARD ANALYSIS <br /> GASOLINE RANGE HYDROCARBONS <br /> 'r� .•:;. : The main compound of interest is petroleum range hydrocarbons. <br /> Gasoline and its constituents pose health hazards in two major <br /> I! classifications: Explosivity and toxicity. The extreme <br /> : flammability of gasoline is commonly known. The lower explosion <br /> limit (LEL) of gasoline vapor is 1.3 percent in air If the <br /> concentration of gasoline vapor in air exceeds 1.3 percent (13,000 <br /> ; ppm} and sufficient quantities of oxygen are present, then the <br /> 1introduction of sufficient heat, spark or flame l result in an <br /> ' explosion. <br /> i <br /> :.�.: IA lesser known health hazard resulting fromexposure to gasoline <br /> sis toxicity. Several common constituents of gsoline have been <br /> ;•C. linked to various health problems. The constituents of gasoline <br /> rCrthat have been shown to cause serious health problems resulting <br /> from relatively minor exposures include Benzene, Toluene, meta, <br /> I :. . para and ortho xylenes, Ethyl benzene, and Tetraethyl lead. <br /> ! Typical' g wei ht of these constituents in gasoline <br /> �4 <br /> percentages (by weight) <br /> [I ; F4 are: Benzene - 0.12-3.50%, Toluene - 2.73-21.800, meta xylene - <br /> � j 1.77-3.87 , para xylene -- 0.77-1.58 , Ortho xylene - 0.68-3.656%, <br /> l land Ethyl benzene - 0.36-2.86%. typical percentage of Tetraethyl <br /> I.lead is. not available. <br /> i Units used to describe occupational exposures to hazardous <br /> substances include: Exposure limit, also known as "Threshold <br /> 'I Limit Value" (TLV) , Ceiling Limit, and the concentration level <br /> II II ; <br /> r' that is "Immediately Dangerous to Life and Health" (IDLH) . The <br /> EEXPOSURLIMIT defines the maximum concentration of a substance to <br /> which one can be exposed during an 8 hour period without suffering <br /> significant health effects. The CEILxNG F-IMI is the <br /> concentration level that cannot be exceeded at any time. A <br /> ' suitable respirator and/or other suitable breathing apparatus and <br /> ii lr ? body protective equipment must be worn if concentration values <br /> ; reach or exceed the ceiling limit. the IDLH LEVF? represents a <br /> maximum concentration from which one could excape within 30 <br /> minutes of respirator failure without experiencing escape{ <br /> impairment or irreversible health damage. The notation Ca <br /> appears ir. the IDLH column for all substances that NIOSH considers <br /> :c ito be potential human carcinogens. <br /> EXPOSURE TABLE <br /> E F{ SrJ�STANGE <br /> TLV—TWA TLV-STEL TLV-CEILING IDLTi <br /> -- - ---- r ;I --- -=---- --------- ---- - - <br /> A 3000 ppM (Ca) <br /> Benzene .01 ppm N/A / <br /> i� E • <br /> Toluene 100 Ppm 150 ppm N/A 2000 ppm <br /> ar l .i 1000 m <br /> Xylene 100 ppm 150 ppm N/A PP <br /> E <br />