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site Hazard Information Provided By: ' Signature: Phone Number: (916) 668 .5300 Date: Job Hazard Analysis Gasoline and/or Diesel Range Hydrocarbons THE MAIN COMPOUND OF INTEREST IS PETROLEUM RANGE HYDROCARBONS IN WATER AND SOIL. GASOLINE AND ITS CONSTITUENTS POSE HEALTH HAZARDS IN TWO MAJOR CLASSIFICATIONS: EXPLOSIVITY AND TOXICITY. THE EXTREME FLAMMABILITY OF GASOLINE IS COMMONLY KNOWN. THE LOWER EXPLOSION LIMIT (LEL) OF GASOLINE VAPOR IS 1.3 PERCENT IN AIR. IF THE CONCENTRATION OF GASOLINE VAPOR IN AIR EXCEEDS 1.3 PERCENT (13, 000 PARTS PER MILLION) AND SUFFICIENT QUANTITIES OF OXYGEN ARE PRESENT, THEN THE INTRODUCTION OF SUFFICIENT HEAT, SPARK OR FLAME WILL RESULT IN AN EXPLOSION. A LESSER KNOWN HEALTH HAZARD RESULTING FROM EXPOSURE TO GASOLINE IS TOXICITY. SEVERAL COMMON CONSTITUENTS OF GASOLINE HAVE BEEN LINKED TO VARIOUS HEALTH PROBLEMS. THE CONSTITUENTS OF GASOLINE THAT HAVE BEEN SHOWN TO CAUSE SERIOUS HEALTH PROBLEMS RESULTING FROM RELATIVELY MINOR EXPOSURES INCLUDE BENZENE, TOLUENE, META, PARA, AND ORTHO XYLENES, ETHYL BENZENE, AND TETRAETHYL LEAD. TYPICAL PERCENTAGES _(BY WEIGHT) OF THESE CONSTITUENTS IN GASOLINE ARE: BENZENE - 0 .12-3 .50%, TOLUENE - 2.73-27.. 80%, META XYLENE - 1.77-3 .87%, PARA XYLENE - 0.77-1.58%, ORTHO XYLENE - 0 .68-2 .686%, AND ETHYL BENZENE - 0 .36-2 .86%. TYPICAL PERCENTAGE OF TETRAETHYL LEAD IS NOT AVAILPJ3LE. UNITS USED TO DESCRIBE OCCUPATIONAL EXPOSURES TO HAZARDOUS SUBSTANCES INCLUDE: EXPOSURE LIMIT, ALSO KNOWN AS THE "THRESHOLD LIMIT VALUE" (TLV) , CEILING LIMIT, AND THE CONCENTRATION LEVEL THAT IS °IMMEDIATELY DANGEROUS TO LIFE AND HEALTH" (IDLH) . THE EXPOSURE LIMIT DEFINES THE MAXIMUM CONCENTRATION OF A SUBSTANCE TO WHICH ONE CAN BE EXPOSED DURING AN 8 HOUR PERIOD WITHOUT SUFFERING SIGNIFICANT HEALTH EFFECTS. THE CEILING LIMIT IS THE CONCENTRATION LEVEL THAT CANNOT BE EXCEEDED AT ANY TIME; i.e. , A SUITABLE RESPIRATOR MUST BE WORN IF CONCENTRATION VALUES REACH THE CEILING LIMIT. THE IDHL LEVEL REPRESENTS A MAXIMUM CONCENTRATION FROM WHICH ONE COULD ESCAPE WITHIN 30 MINUTES OF RESPIRATOR FAILURE WITHOUT EXPERIENCING ESCAPE-IMPAIRMENT OR IRREVERSIBLE HEALTH DAMAGE. IDLH VALUES ARE NOT LISTED FOR SUBSTANCES THAT ARE POTENTIAL HUMAN CARCINOGENS. EXPOSURE TABLE Page 5