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Site Hazard Information Provided By: Signature: Phone Number: (916) 652-5777 Date: I have read and fully understand the information and safety requirements in this Site Safety Plan. Signatures: JOB HAZARD ANALYSIS GASOLINE AND DIESEL RANGE HYDROCARBONS The main compound of interest is petroleum hydrocarbons in the gasoline range. 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 ppm) 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 and to a lesser extent diesel 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. 73-21.80%, meta xylene - 1.77-3 .87%, para xylene - 0. 77-1.58%, ortho xylene - 0. 68-3 .686%, and ethyl benzene - 0. 36-2.86%. Typical percentage of tetraethyl lead is not available. Units used to describe occupational exposures to hazardous substances include: Exposure limit, also known as "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. i 14