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�3 p1 IV. HAZkRD EVALUATION A. Overa 1 Lazard Level: The overall hazard zinvestigation low to moderate, based on the Previous otiential may be y and remediation. The hazard p increased by still winds and high temperatures. B. Chemical Hazards: Gasoline is a mixture of paraffins, aromatics, and olefins. Benzene, a known human care enogen is the major constituent of concern in g The principal constituents of concerai stemming from the Disco gasoline underground tanks are benzene, toluene, xylene, and lead. The Canal tetraethyl- u lead for benzene, toluene, xylene, are: Benzene: 10 ppm, 25 Ppm excursion limit, excursion duration 10 min/8hrs, ceiling limit of 50 PPM Toluene: 100 ppm, 200 ppm excursion limit, excursion duration 10 rin/ 8hrs, 500 PPM ceiling limit Xylenes: 100 ppm, 200 ppm excursion limit, excursion duration 30 min/8hrs, 300 ppm ceiling limit r40 Tetraethyl Lead: 0.1 mg/m3 Listed substances have a potential to enter the body through simple skin contact. This hmucousrall risk membra es Sand the cutaneous route including eye entry, either by airborne or, more particularly, by direct contact with the substance. The rate of absorption is a function of the riate measures for which the oncentration to skin is expcutaneousp absorption must be « F. the prevention of followed. to concentrations above the 'rexcursion Exposures limit", but not to exceed the "ceiling limit", are permitted for a time period not to exceed the "excursion duration"- the - --- - g Tables A-1 and A-2 summarize of the above chemical,--and-P Yscal -characteristics -- _ -_ -- -- - --- - ---- gasoline constituents. Diesel fuel is a complex petroleum mixture of paraffinic, olefinic, napthenic, and aromatic �- A-3 SF031605\WP\005.51