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i Hazard Assessment The mayor contaminants expected to be encountered on the project are gasoline and its hydrocarbon constituents The anticipated contaminants and their exposure standards are listed in Table 1 It is not anticipated that the potential levels of exposure will reach the permissible exposure limits (PEL) or threshold limit values (TLV) Inhalation and dermal contact are the potential exposure pathways Protective clothing will be mandatory for field personnel specified in this Plan In addition, respiratory protective devices are required to be worn by each person on site or to be within easy reach should irritating odors be detected or imtation of the respiratory tract occur i Table 1 Exposure Limits of Anticipated Chemical Contaminants ARCO Service Station No. 2186 3212 California Street Stockton, California Contaminant PEL EL ED CL I TWA STEL Benzene' [skin] & 1* --- -------- -- 10* 5* [carc] Ethylbenzene 100* --- ------- -- 100* 125* Gasoline 300* -- ------- --- 300* 500* Toluene[skin] 100* 200* 10 min per 500* 100* 150* 8 hrs Xylene(o,m,&p 100* 200* 30 nun per 300* 100* 150* isometers) [stun] 8 hrs PEL = permissible exposure limit 8 hour,tune-weighted average,California Occupational Safety and Health Administration Standard(CAL-OSHA) EL = excursion limit maximum concentration of an airborne contaminant to which an employee may be exposed without regard to duration provided the 8 hour tune-weighted average for PEL is not exceeded(CAL-OSHA) ED = excursion duration maximum time period permitted for an exposure above the excursion limit but not exceeding the ceiling limit(CAL-OSHA) CL = ceiling limit maximum concentration of airborne contaminant which employees may be exposed permitted(CAL-OSHA) TWA = time-weighted average 8 hour,(same as threshold limit value [TLV]),American Conference of Governmental Industrial H ienists(ACGIH) SAM 1PJ010805108051470 IAN-941d m 1 B-3