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i 1. JOB HAZARD ASSESSMENT Immediate tasks at any leaking UST site include an evaluation of any present or potential threat to public safety. Questions need to be answered regarding the dangers of significant vapor exposures and potential explosion hazards. Potential Chemical Hazards The chemical components of gasoline that are the most dangerous to site workers are the volatile aromatics,benzene,toluene,ethylbenzene,xylene,and potentially,organic lead(see attached Material Safety Data Sheet). The primary health risks associated with each of these chemicals are described below. Gasoline-Suspected human carcinogen. A TLV of 300 ppm or 900 mg/m'has been assigned to gasoline. This',value of 300 ppm was assigned based on an average of 3 percent benzene(10 ppm TLV)in gasoline. Low-level inhalation exposure to gasoline can cause irritation to the eyes,nose, and respiratory system;headache; and nausea. Benzene-Suspected human carcinogen. A TLV.of 10 ppm or 30 mglm3 has been assigned to benzene_ Benzene has a low odor threshold limit of 1.4 ppm. Low-level inhalation exposure to benzene can cause irritation to the eyes,nose, and respiratory system;headache, and nausea. Toluene-A TLV OF 100 ppm or.375 mg/m' has been assigned to toluene. Toluene has a low odor threshold limit of 2.1 ppm. Low-level inhalation exposure to toluene can cause fatigue, weakness, confusion, and euphoria. Ethylibenzene-A TLV of 100 ppm.or 435 mg/m' has been assigned to ethylbenzene_ Ethylbenzene has a low odor threshold limit of 2 ppm. Low-level inhalation exposure to ethylbenzene can cause irritation to the eyes and mucous membranes. j Xylene-A TLV or 100 ppm or 435 mg/m' has been assigned to xylene.No low odor threshold limit has been established for xylene. Low-level inhalation exposure to xylene can cause dizziness,excitement, and drowsiness. M ainlD\Environmentall%TE\W nrkplaa%W orkplan I 1 192007.wpd