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JOB HAZARD ANALYSIS <br /> GASB RANGE HYDROCARBONS <br /> The main compound of interest is petroleum range hydrocarbons. <br /> Gasoline and its constituents pose health hazards in two mayor <br /> 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 /> t concentration of gasoline vapor in air exceeds 1 .3 percent ( 13 ,000 <br /> ppm) and sufficient quantities of oxygen are present, then the <br /> introduction of sufficient heat, spark or flame wj.0 result in an <br /> explosion. <br /> A lesser known health hazard resulting from exposure to gasoline <br /> is toxicity. Several common constituents of gsoline have been <br /> linked to various health problems. The constituents of gasoline <br /> that have been sbown to cause serious health problems resulting <br /> from relatively ainor exposures include Benzene, Toluene, meta, <br /> para and ortho xylenes, Ethyl benzene, and Tetraethyl lead. <br /> Typical percentages (by weight) of these constituents in gasoline <br /> are: Benzene - 0.12-3.50% , Toluene - 2.73-21 . 80%, meta xylene - <br /> ` 1 .77-3.87%, para xylene - 0 .77-1 .58%, ortho xylene - 0.68-3 .686% , <br /> and Ethyl benzene - 0. 36-2. 86%. typical percentage of Tetraethyl <br /> lead is not available. <br /> Units used to describe occupational exposures to hazardous <br /> substances include: Exposure limit, also known as "Threshold <br /> Limit Value" (TLV) , Ceiling Licit, and the concentration level <br /> that zs -Immediately Dangerous to Life and Health" (IDLH) . The <br /> 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 CEILING LIMIT is the <br /> concentration level that cannot be exceeded at any time. A <br /> suitable respirator and/or other suitable breathing apparatus and <br /> ! body protective equipment must be worn if concentration values <br /> reach or exceed the ceiling limit. the IDLE LSVSL represents a <br /> maximum concentration from which one could excape within 30 <br /> minutes of respirator failure without experiencing escape- <br /> impai.raent or irreversible health damage. The notation "Ca" <br /> appears in the IDLH column for all substances that NIOSH considers <br /> to be potential human carcinogens. <br /> i VC208M TABLE <br /> SUBS TLV-Tim TLV-sTg[. TLV- RILI Do <br /> Benzene .01 ppm N/A N/A 3000 ppa (Ca) <br /> Toluene 100 ppm 150 ppm N/A 2000 ppa <br /> �S Xylene 104 ppm 150 ppm N/A 1000 ppm <br /> I <br /> I <br /> r r <br />